major changes

env/lib/python3.5/site-packages/jinja2/parser.py

+# -*- coding: utf-8 -*-
+"""Parse tokens from the lexer into nodes for the compiler."""
+from . import nodes
+from ._compat import imap
+from .exceptions import TemplateAssertionError
+from .exceptions import TemplateSyntaxError
+from .lexer import describe_token
+from .lexer import describe_token_expr
+
+_statement_keywords = frozenset(
+    [
+        "for",
+        "if",
+        "block",
+        "extends",
+        "print",
+        "macro",
+        "include",
+        "from",
+        "import",
+        "set",
+        "with",
+        "autoescape",
+    ]
+)
+_compare_operators = frozenset(["eq", "ne", "lt", "lteq", "gt", "gteq"])
+
+_math_nodes = {
+    "add": nodes.Add,
+    "sub": nodes.Sub,
+    "mul": nodes.Mul,
+    "div": nodes.Div,
+    "floordiv": nodes.FloorDiv,
+    "mod": nodes.Mod,
+}
+
+
+class Parser(object):
+    """This is the central parsing class Jinja uses.  It's passed to
+    extensions and can be used to parse expressions or statements.
+    """
+
+    def __init__(self, environment, source, name=None, filename=None, state=None):
+        self.environment = environment
+        self.stream = environment._tokenize(source, name, filename, state)
+        self.name = name
+        self.filename = filename
+        self.closed = False
+        self.extensions = {}
+        for extension in environment.iter_extensions():
+            for tag in extension.tags:
+                self.extensions[tag] = extension.parse
+        self._last_identifier = 0
+        self._tag_stack = []
+        self._end_token_stack = []
+
+    def fail(self, msg, lineno=None, exc=TemplateSyntaxError):
+        """Convenience method that raises `exc` with the message, passed
+        line number or last line number as well as the current name and
+        filename.
+        """
+        if lineno is None:
+            lineno = self.stream.current.lineno
+        raise exc(msg, lineno, self.name, self.filename)
+
+    def _fail_ut_eof(self, name, end_token_stack, lineno):
+        expected = []
+        for exprs in end_token_stack:
+            expected.extend(imap(describe_token_expr, exprs))
+        if end_token_stack:
+            currently_looking = " or ".join(
+                "'%s'" % describe_token_expr(expr) for expr in end_token_stack[-1]
+            )
+        else:
+            currently_looking = None
+
+        if name is None:
+            message = ["Unexpected end of template."]
+        else:
+            message = ["Encountered unknown tag '%s'." % name]
+
+        if currently_looking:
+            if name is not None and name in expected:
+                message.append(
+                    "You probably made a nesting mistake. Jinja "
+                    "is expecting this tag, but currently looking "
+                    "for %s." % currently_looking
+                )
+            else:
+                message.append(
+                    "Jinja was looking for the following tags: "
+                    "%s." % currently_looking
+                )
+
+        if self._tag_stack:
+            message.append(
+                "The innermost block that needs to be "
+                "closed is '%s'." % self._tag_stack[-1]
+            )
+
+        self.fail(" ".join(message), lineno)
+
+    def fail_unknown_tag(self, name, lineno=None):
+        """Called if the parser encounters an unknown tag.  Tries to fail
+        with a human readable error message that could help to identify
+        the problem.
+        """
+        return self._fail_ut_eof(name, self._end_token_stack, lineno)
+
+    def fail_eof(self, end_tokens=None, lineno=None):
+        """Like fail_unknown_tag but for end of template situations."""
+        stack = list(self._end_token_stack)
+        if end_tokens is not None:
+            stack.append(end_tokens)
+        return self._fail_ut_eof(None, stack, lineno)
+
+    def is_tuple_end(self, extra_end_rules=None):
+        """Are we at the end of a tuple?"""
+        if self.stream.current.type in ("variable_end", "block_end", "rparen"):
+            return True
+        elif extra_end_rules is not None:
+            return self.stream.current.test_any(extra_end_rules)
+        return False
+
+    def free_identifier(self, lineno=None):
+        """Return a new free identifier as :class:`~jinja2.nodes.InternalName`."""
+        self._last_identifier += 1
+        rv = object.__new__(nodes.InternalName)
+        nodes.Node.__init__(rv, "fi%d" % self._last_identifier, lineno=lineno)
+        return rv
+
+    def parse_statement(self):
+        """Parse a single statement."""
+        token = self.stream.current
+        if token.type != "name":
+            self.fail("tag name expected", token.lineno)
+        self._tag_stack.append(token.value)
+        pop_tag = True
+        try:
+            if token.value in _statement_keywords:
+                return getattr(self, "parse_" + self.stream.current.value)()
+            if token.value == "call":
+                return self.parse_call_block()
+            if token.value == "filter":
+                return self.parse_filter_block()
+            ext = self.extensions.get(token.value)
+            if ext is not None:
+                return ext(self)
+
+            # did not work out, remove the token we pushed by accident
+            # from the stack so that the unknown tag fail function can
+            # produce a proper error message.
+            self._tag_stack.pop()
+            pop_tag = False
+            self.fail_unknown_tag(token.value, token.lineno)
+        finally:
+            if pop_tag:
+                self._tag_stack.pop()
+
+    def parse_statements(self, end_tokens, drop_needle=False):
+        """Parse multiple statements into a list until one of the end tokens
+        is reached.  This is used to parse the body of statements as it also
+        parses template data if appropriate.  The parser checks first if the
+        current token is a colon and skips it if there is one.  Then it checks
+        for the block end and parses until if one of the `end_tokens` is
+        reached.  Per default the active token in the stream at the end of
+        the call is the matched end token.  If this is not wanted `drop_needle`
+        can be set to `True` and the end token is removed.
+        """
+        # the first token may be a colon for python compatibility
+        self.stream.skip_if("colon")
+
+        # in the future it would be possible to add whole code sections
+        # by adding some sort of end of statement token and parsing those here.
+        self.stream.expect("block_end")
+        result = self.subparse(end_tokens)
+
+        # we reached the end of the template too early, the subparser
+        # does not check for this, so we do that now
+        if self.stream.current.type == "eof":
+            self.fail_eof(end_tokens)
+
+        if drop_needle:
+            next(self.stream)
+        return result
+
+    def parse_set(self):
+        """Parse an assign statement."""
+        lineno = next(self.stream).lineno
+        target = self.parse_assign_target(with_namespace=True)
+        if self.stream.skip_if("assign"):
+            expr = self.parse_tuple()
+            return nodes.Assign(target, expr, lineno=lineno)
+        filter_node = self.parse_filter(None)
+        body = self.parse_statements(("name:endset",), drop_needle=True)
+        return nodes.AssignBlock(target, filter_node, body, lineno=lineno)
+
+    def parse_for(self):
+        """Parse a for loop."""
+        lineno = self.stream.expect("name:for").lineno
+        target = self.parse_assign_target(extra_end_rules=("name:in",))
+        self.stream.expect("name:in")
+        iter = self.parse_tuple(
+            with_condexpr=False, extra_end_rules=("name:recursive",)
+        )
+        test = None
+        if self.stream.skip_if("name:if"):
+            test = self.parse_expression()
+        recursive = self.stream.skip_if("name:recursive")
+        body = self.parse_statements(("name:endfor", "name:else"))
+        if next(self.stream).value == "endfor":
+            else_ = []
+        else:
+            else_ = self.parse_statements(("name:endfor",), drop_needle=True)
+        return nodes.For(target, iter, body, else_, test, recursive, lineno=lineno)
+
+    def parse_if(self):
+        """Parse an if construct."""
+        node = result = nodes.If(lineno=self.stream.expect("name:if").lineno)
+        while 1:
+            node.test = self.parse_tuple(with_condexpr=False)
+            node.body = self.parse_statements(("name:elif", "name:else", "name:endif"))
+            node.elif_ = []
+            node.else_ = []
+            token = next(self.stream)
+            if token.test("name:elif"):
+                node = nodes.If(lineno=self.stream.current.lineno)
+                result.elif_.append(node)
+                continue
+            elif token.test("name:else"):
+                result.else_ = self.parse_statements(("name:endif",), drop_needle=True)
+            break
+        return result
+
+    def parse_with(self):
+        node = nodes.With(lineno=next(self.stream).lineno)
+        targets = []
+        values = []
+        while self.stream.current.type != "block_end":
+            if targets:
+                self.stream.expect("comma")
+            target = self.parse_assign_target()
+            target.set_ctx("param")
+            targets.append(target)
+            self.stream.expect("assign")
+            values.append(self.parse_expression())
+        node.targets = targets
+        node.values = values
+        node.body = self.parse_statements(("name:endwith",), drop_needle=True)
+        return node
+
+    def parse_autoescape(self):
+        node = nodes.ScopedEvalContextModifier(lineno=next(self.stream).lineno)
+        node.options = [nodes.Keyword("autoescape", self.parse_expression())]
+        node.body = self.parse_statements(("name:endautoescape",), drop_needle=True)
+        return nodes.Scope([node])
+
+    def parse_block(self):
+        node = nodes.Block(lineno=next(self.stream).lineno)
+        node.name = self.stream.expect("name").value
+        node.scoped = self.stream.skip_if("name:scoped")
+
+        # common problem people encounter when switching from django
+        # to jinja.  we do not support hyphens in block names, so let's
+        # raise a nicer error message in that case.
+        if self.stream.current.type == "sub":
+            self.fail(
+                "Block names in Jinja have to be valid Python "
+                "identifiers and may not contain hyphens, use an "
+                "underscore instead."
+            )
+
+        node.body = self.parse_statements(("name:endblock",), drop_needle=True)
+        self.stream.skip_if("name:" + node.name)
+        return node
+
+    def parse_extends(self):
+        node = nodes.Extends(lineno=next(self.stream).lineno)
+        node.template = self.parse_expression()
+        return node
+
+    def parse_import_context(self, node, default):
+        if self.stream.current.test_any(
+            "name:with", "name:without"
+        ) and self.stream.look().test("name:context"):
+            node.with_context = next(self.stream).value == "with"
+            self.stream.skip()
+        else:
+            node.with_context = default
+        return node
+
+    def parse_include(self):
+        node = nodes.Include(lineno=next(self.stream).lineno)
+        node.template = self.parse_expression()
+        if self.stream.current.test("name:ignore") and self.stream.look().test(
+            "name:missing"
+        ):
+            node.ignore_missing = True
+            self.stream.skip(2)
+        else:
+            node.ignore_missing = False
+        return self.parse_import_context(node, True)
+
+    def parse_import(self):
+        node = nodes.Import(lineno=next(self.stream).lineno)
+        node.template = self.parse_expression()
+        self.stream.expect("name:as")
+        node.target = self.parse_assign_target(name_only=True).name
+        return self.parse_import_context(node, False)
+
+    def parse_from(self):
+        node = nodes.FromImport(lineno=next(self.stream).lineno)
+        node.template = self.parse_expression()
+        self.stream.expect("name:import")
+        node.names = []
+
+        def parse_context():
+            if self.stream.current.value in (
+                "with",
+                "without",
+            ) and self.stream.look().test("name:context"):
+                node.with_context = next(self.stream).value == "with"
+                self.stream.skip()
+                return True
+            return False
+
+        while 1:
+            if node.names:
+                self.stream.expect("comma")
+            if self.stream.current.type == "name":
+                if parse_context():
+                    break
+                target = self.parse_assign_target(name_only=True)
+                if target.name.startswith("_"):
+                    self.fail(
+                        "names starting with an underline can not be imported",
+                        target.lineno,
+                        exc=TemplateAssertionError,
+                    )
+                if self.stream.skip_if("name:as"):
+                    alias = self.parse_assign_target(name_only=True)
+                    node.names.append((target.name, alias.name))
+                else:
+                    node.names.append(target.name)
+                if parse_context() or self.stream.current.type != "comma":
+                    break
+            else:
+                self.stream.expect("name")
+        if not hasattr(node, "with_context"):
+            node.with_context = False
+        return node
+
+    def parse_signature(self, node):
+        node.args = args = []
+        node.defaults = defaults = []
+        self.stream.expect("lparen")
+        while self.stream.current.type != "rparen":
+            if args:
+                self.stream.expect("comma")
+            arg = self.parse_assign_target(name_only=True)
+            arg.set_ctx("param")
+            if self.stream.skip_if("assign"):
+                defaults.append(self.parse_expression())
+            elif defaults:
+                self.fail("non-default argument follows default argument")
+            args.append(arg)
+        self.stream.expect("rparen")
+
+    def parse_call_block(self):
+        node = nodes.CallBlock(lineno=next(self.stream).lineno)
+        if self.stream.current.type == "lparen":
+            self.parse_signature(node)
+        else:
+            node.args = []
+            node.defaults = []
+
+        node.call = self.parse_expression()
+        if not isinstance(node.call, nodes.Call):
+            self.fail("expected call", node.lineno)
+        node.body = self.parse_statements(("name:endcall",), drop_needle=True)
+        return node
+
+    def parse_filter_block(self):
+        node = nodes.FilterBlock(lineno=next(self.stream).lineno)
+        node.filter = self.parse_filter(None, start_inline=True)
+        node.body = self.parse_statements(("name:endfilter",), drop_needle=True)
+        return node
+
+    def parse_macro(self):
+        node = nodes.Macro(lineno=next(self.stream).lineno)
+        node.name = self.parse_assign_target(name_only=True).name
+        self.parse_signature(node)
+        node.body = self.parse_statements(("name:endmacro",), drop_needle=True)
+        return node
+
+    def parse_print(self):
+        node = nodes.Output(lineno=next(self.stream).lineno)
+        node.nodes = []
+        while self.stream.current.type != "block_end":
+            if node.nodes:
+                self.stream.expect("comma")
+            node.nodes.append(self.parse_expression())
+        return node
+
+    def parse_assign_target(
+        self,
+        with_tuple=True,
+        name_only=False,
+        extra_end_rules=None,
+        with_namespace=False,
+    ):
+        """Parse an assignment target.  As Jinja allows assignments to
+        tuples, this function can parse all allowed assignment targets.  Per
+        default assignments to tuples are parsed, that can be disable however
+        by setting `with_tuple` to `False`.  If only assignments to names are
+        wanted `name_only` can be set to `True`.  The `extra_end_rules`
+        parameter is forwarded to the tuple parsing function.  If
+        `with_namespace` is enabled, a namespace assignment may be parsed.
+        """
+        if with_namespace and self.stream.look().type == "dot":
+            token = self.stream.expect("name")
+            next(self.stream)  # dot
+            attr = self.stream.expect("name")
+            target = nodes.NSRef(token.value, attr.value, lineno=token.lineno)
+        elif name_only:
+            token = self.stream.expect("name")
+            target = nodes.Name(token.value, "store", lineno=token.lineno)
+        else:
+            if with_tuple:
+                target = self.parse_tuple(
+                    simplified=True, extra_end_rules=extra_end_rules
+                )
+            else:
+                target = self.parse_primary()
+            target.set_ctx("store")
+        if not target.can_assign():
+            self.fail(
+                "can't assign to %r" % target.__class__.__name__.lower(), target.lineno
+            )
+        return target
+
+    def parse_expression(self, with_condexpr=True):
+        """Parse an expression.  Per default all expressions are parsed, if
+        the optional `with_condexpr` parameter is set to `False` conditional
+        expressions are not parsed.
+        """
+        if with_condexpr:
+            return self.parse_condexpr()
+        return self.parse_or()
+
+    def parse_condexpr(self):
+        lineno = self.stream.current.lineno
+        expr1 = self.parse_or()
+        while self.stream.skip_if("name:if"):
+            expr2 = self.parse_or()
+            if self.stream.skip_if("name:else"):
+                expr3 = self.parse_condexpr()
+            else:
+                expr3 = None
+            expr1 = nodes.CondExpr(expr2, expr1, expr3, lineno=lineno)
+            lineno = self.stream.current.lineno
+        return expr1
+
+    def parse_or(self):
+        lineno = self.stream.current.lineno
+        left = self.parse_and()
+        while self.stream.skip_if("name:or"):
+            right = self.parse_and()
+            left = nodes.Or(left, right, lineno=lineno)
+            lineno = self.stream.current.lineno
+        return left
+
+    def parse_and(self):
+        lineno = self.stream.current.lineno
+        left = self.parse_not()
+        while self.stream.skip_if("name:and"):
+            right = self.parse_not()
+            left = nodes.And(left, right, lineno=lineno)
+            lineno = self.stream.current.lineno
+        return left
+
+    def parse_not(self):
+        if self.stream.current.test("name:not"):
+            lineno = next(self.stream).lineno
+            return nodes.Not(self.parse_not(), lineno=lineno)
+        return self.parse_compare()
+
+    def parse_compare(self):
+        lineno = self.stream.current.lineno
+        expr = self.parse_math1()
+        ops = []
+        while 1:
+            token_type = self.stream.current.type
+            if token_type in _compare_operators:
+                next(self.stream)
+                ops.append(nodes.Operand(token_type, self.parse_math1()))
+            elif self.stream.skip_if("name:in"):
+                ops.append(nodes.Operand("in", self.parse_math1()))
+            elif self.stream.current.test("name:not") and self.stream.look().test(
+                "name:in"
+            ):
+                self.stream.skip(2)
+                ops.append(nodes.Operand("notin", self.parse_math1()))
+            else:
+                break
+            lineno = self.stream.current.lineno
+        if not ops:
+            return expr
+        return nodes.Compare(expr, ops, lineno=lineno)
+
+    def parse_math1(self):
+        lineno = self.stream.current.lineno
+        left = self.parse_concat()
+        while self.stream.current.type in ("add", "sub"):
+            cls = _math_nodes[self.stream.current.type]
+            next(self.stream)
+            right = self.parse_concat()
+            left = cls(left, right, lineno=lineno)
+            lineno = self.stream.current.lineno
+        return left
+
+    def parse_concat(self):
+        lineno = self.stream.current.lineno
+        args = [self.parse_math2()]
+        while self.stream.current.type == "tilde":
+            next(self.stream)
+            args.append(self.parse_math2())
+        if len(args) == 1:
+            return args[0]
+        return nodes.Concat(args, lineno=lineno)
+
+    def parse_math2(self):
+        lineno = self.stream.current.lineno
+        left = self.parse_pow()
+        while self.stream.current.type in ("mul", "div", "floordiv", "mod"):
+            cls = _math_nodes[self.stream.current.type]
+            next(self.stream)
+            right = self.parse_pow()
+            left = cls(left, right, lineno=lineno)
+            lineno = self.stream.current.lineno
+        return left
+
+    def parse_pow(self):
+        lineno = self.stream.current.lineno
+        left = self.parse_unary()
+        while self.stream.current.type == "pow":
+            next(self.stream)
+            right = self.parse_unary()
+            left = nodes.Pow(left, right, lineno=lineno)
+            lineno = self.stream.current.lineno
+        return left
+
+    def parse_unary(self, with_filter=True):
+        token_type = self.stream.current.type
+        lineno = self.stream.current.lineno
+        if token_type == "sub":
+            next(self.stream)
+            node = nodes.Neg(self.parse_unary(False), lineno=lineno)
+        elif token_type == "add":
+            next(self.stream)
+            node = nodes.Pos(self.parse_unary(False), lineno=lineno)
+        else:
+            node = self.parse_primary()
+        node = self.parse_postfix(node)
+        if with_filter:
+            node = self.parse_filter_expr(node)
+        return node
+
+    def parse_primary(self):
+        token = self.stream.current
+        if token.type == "name":
+            if token.value in ("true", "false", "True", "False"):
+                node = nodes.Const(token.value in ("true", "True"), lineno=token.lineno)
+            elif token.value in ("none", "None"):
+                node = nodes.Const(None, lineno=token.lineno)
+            else:
+                node = nodes.Name(token.value, "load", lineno=token.lineno)
+            next(self.stream)
+        elif token.type == "string":
+            next(self.stream)
+            buf = [token.value]
+            lineno = token.lineno
+            while self.stream.current.type == "string":
+                buf.append(self.stream.current.value)
+                next(self.stream)
+            node = nodes.Const("".join(buf), lineno=lineno)
+        elif token.type in ("integer", "float"):
+            next(self.stream)
+            node = nodes.Const(token.value, lineno=token.lineno)
+        elif token.type == "lparen":
+            next(self.stream)
+            node = self.parse_tuple(explicit_parentheses=True)
+            self.stream.expect("rparen")
+        elif token.type == "lbracket":
+            node = self.parse_list()
+        elif token.type == "lbrace":
+            node = self.parse_dict()
+        else:
+            self.fail("unexpected '%s'" % describe_token(token), token.lineno)
+        return node
+
+    def parse_tuple(
+        self,
+        simplified=False,
+        with_condexpr=True,
+        extra_end_rules=None,
+        explicit_parentheses=False,
+    ):
+        """Works like `parse_expression` but if multiple expressions are
+        delimited by a comma a :class:`~jinja2.nodes.Tuple` node is created.
+        This method could also return a regular expression instead of a tuple
+        if no commas where found.
+
+        The default parsing mode is a full tuple.  If `simplified` is `True`
+        only names and literals are parsed.  The `no_condexpr` parameter is
+        forwarded to :meth:`parse_expression`.
+
+        Because tuples do not require delimiters and may end in a bogus comma
+        an extra hint is needed that marks the end of a tuple.  For example
+        for loops support tuples between `for` and `in`.  In that case the
+        `extra_end_rules` is set to ``['name:in']``.
+
+        `explicit_parentheses` is true if the parsing was triggered by an
+        expression in parentheses.  This is used to figure out if an empty
+        tuple is a valid expression or not.
+        """
+        lineno = self.stream.current.lineno
+        if simplified:
+            parse = self.parse_primary
+        elif with_condexpr:
+            parse = self.parse_expression
+        else:
+
+            def parse():
+                return self.parse_expression(with_condexpr=False)
+
+        args = []
+        is_tuple = False
+        while 1:
+            if args:
+                self.stream.expect("comma")
+            if self.is_tuple_end(extra_end_rules):
+                break
+            args.append(parse())
+            if self.stream.current.type == "comma":
+                is_tuple = True
+            else:
+                break
+            lineno = self.stream.current.lineno
+
+        if not is_tuple:
+            if args:
+                return args[0]
+
+            # if we don't have explicit parentheses, an empty tuple is
+            # not a valid expression.  This would mean nothing (literally
+            # nothing) in the spot of an expression would be an empty
+            # tuple.
+            if not explicit_parentheses:
+                self.fail(
+                    "Expected an expression, got '%s'"
+                    % describe_token(self.stream.current)
+                )
+
+        return nodes.Tuple(args, "load", lineno=lineno)
+
+    def parse_list(self):
+        token = self.stream.expect("lbracket")
+        items = []
+        while self.stream.current.type != "rbracket":
+            if items:
+                self.stream.expect("comma")
+            if self.stream.current.type == "rbracket":
+                break
+            items.append(self.parse_expression())
+        self.stream.expect("rbracket")
+        return nodes.List(items, lineno=token.lineno)
+
+    def parse_dict(self):
+        token = self.stream.expect("lbrace")
+        items = []
+        while self.stream.current.type != "rbrace":
+            if items:
+                self.stream.expect("comma")
+            if self.stream.current.type == "rbrace":
+                break
+            key = self.parse_expression()
+            self.stream.expect("colon")
+            value = self.parse_expression()
+            items.append(nodes.Pair(key, value, lineno=key.lineno))
+        self.stream.expect("rbrace")
+        return nodes.Dict(items, lineno=token.lineno)
+
+    def parse_postfix(self, node):
+        while 1:
+            token_type = self.stream.current.type
+            if token_type == "dot" or token_type == "lbracket":
+                node = self.parse_subscript(node)
+            # calls are valid both after postfix expressions (getattr
+            # and getitem) as well as filters and tests
+            elif token_type == "lparen":
+                node = self.parse_call(node)
+            else:
+                break
+        return node
+
+    def parse_filter_expr(self, node):
+        while 1:
+            token_type = self.stream.current.type
+            if token_type == "pipe":
+                node = self.parse_filter(node)
+            elif token_type == "name" and self.stream.current.value == "is":
+                node = self.parse_test(node)
+            # calls are valid both after postfix expressions (getattr
+            # and getitem) as well as filters and tests
+            elif token_type == "lparen":
+                node = self.parse_call(node)
+            else:
+                break
+        return node
+
+    def parse_subscript(self, node):
+        token = next(self.stream)
+        if token.type == "dot":
+            attr_token = self.stream.current
+            next(self.stream)
+            if attr_token.type == "name":
+                return nodes.Getattr(
+                    node, attr_token.value, "load", lineno=token.lineno
+                )
+            elif attr_token.type != "integer":
+                self.fail("expected name or number", attr_token.lineno)
+            arg = nodes.Const(attr_token.value, lineno=attr_token.lineno)
+            return nodes.Getitem(node, arg, "load", lineno=token.lineno)
+        if token.type == "lbracket":
+            args = []
+            while self.stream.current.type != "rbracket":
+                if args:
+                    self.stream.expect("comma")
+                args.append(self.parse_subscribed())
+            self.stream.expect("rbracket")
+            if len(args) == 1:
+                arg = args[0]
+            else:
+                arg = nodes.Tuple(args, "load", lineno=token.lineno)
+            return nodes.Getitem(node, arg, "load", lineno=token.lineno)
+        self.fail("expected subscript expression", token.lineno)
+
+    def parse_subscribed(self):
+        lineno = self.stream.current.lineno
+
+        if self.stream.current.type == "colon":
+            next(self.stream)
+            args = [None]
+        else:
+            node = self.parse_expression()
+            if self.stream.current.type != "colon":
+                return node
+            next(self.stream)
+            args = [node]
+
+        if self.stream.current.type == "colon":
+            args.append(None)
+        elif self.stream.current.type not in ("rbracket", "comma"):
+            args.append(self.parse_expression())
+        else:
+            args.append(None)
+
+        if self.stream.current.type == "colon":
+            next(self.stream)
+            if self.stream.current.type not in ("rbracket", "comma"):
+                args.append(self.parse_expression())
+            else:
+                args.append(None)
+        else:
+            args.append(None)
+
+        return nodes.Slice(lineno=lineno, *args)
+
+    def parse_call(self, node):
+        token = self.stream.expect("lparen")
+        args = []
+        kwargs = []
+        dyn_args = dyn_kwargs = None
+        require_comma = False
+
+        def ensure(expr):
+            if not expr:
+                self.fail("invalid syntax for function call expression", token.lineno)
+
+        while self.stream.current.type != "rparen":
+            if require_comma:
+                self.stream.expect("comma")
+                # support for trailing comma
+                if self.stream.current.type == "rparen":
+                    break
+            if self.stream.current.type == "mul":
+                ensure(dyn_args is None and dyn_kwargs is None)
+                next(self.stream)
+                dyn_args = self.parse_expression()
+            elif self.stream.current.type == "pow":
+                ensure(dyn_kwargs is None)
+                next(self.stream)
+                dyn_kwargs = self.parse_expression()
+            else:
+                if (
+                    self.stream.current.type == "name"
+                    and self.stream.look().type == "assign"
+                ):
+                    # Parsing a kwarg
+                    ensure(dyn_kwargs is None)
+                    key = self.stream.current.value
+                    self.stream.skip(2)
+                    value = self.parse_expression()
+                    kwargs.append(nodes.Keyword(key, value, lineno=value.lineno))
+                else:
+                    # Parsing an arg
+                    ensure(dyn_args is None and dyn_kwargs is None and not kwargs)
+                    args.append(self.parse_expression())
+
+            require_comma = True
+        self.stream.expect("rparen")
+
+        if node is None:
+            return args, kwargs, dyn_args, dyn_kwargs
+        return nodes.Call(node, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno)
+
+    def parse_filter(self, node, start_inline=False):
+        while self.stream.current.type == "pipe" or start_inline:
+            if not start_inline:
+                next(self.stream)
+            token = self.stream.expect("name")
+            name = token.value
+            while self.stream.current.type == "dot":
+                next(self.stream)
+                name += "." + self.stream.expect("name").value
+            if self.stream.current.type == "lparen":
+                args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
+            else:
+                args = []
+                kwargs = []
+                dyn_args = dyn_kwargs = None
+            node = nodes.Filter(
+                node, name, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno
+            )
+            start_inline = False
+        return node
+
+    def parse_test(self, node):
+        token = next(self.stream)
+        if self.stream.current.test("name:not"):
+            next(self.stream)
+            negated = True
+        else:
+            negated = False
+        name = self.stream.expect("name").value
+        while self.stream.current.type == "dot":
+            next(self.stream)
+            name += "." + self.stream.expect("name").value
+        dyn_args = dyn_kwargs = None
+        kwargs = []
+        if self.stream.current.type == "lparen":
+            args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
+        elif self.stream.current.type in (
+            "name",
+            "string",
+            "integer",
+            "float",
+            "lparen",
+            "lbracket",
+            "lbrace",
+        ) and not self.stream.current.test_any("name:else", "name:or", "name:and"):
+            if self.stream.current.test("name:is"):
+                self.fail("You cannot chain multiple tests with is")
+            arg_node = self.parse_primary()
+            arg_node = self.parse_postfix(arg_node)
+            args = [arg_node]
+        else:
+            args = []
+        node = nodes.Test(
+            node, name, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno
+        )
+        if negated:
+            node = nodes.Not(node, lineno=token.lineno)
+        return node
+
+    def subparse(self, end_tokens=None):
+        body = []
+        data_buffer = []
+        add_data = data_buffer.append
+
+        if end_tokens is not None:
+            self._end_token_stack.append(end_tokens)
+
+        def flush_data():
+            if data_buffer:
+                lineno = data_buffer[0].lineno
+                body.append(nodes.Output(data_buffer[:], lineno=lineno))
+                del data_buffer[:]
+
+        try:
+            while self.stream:
+                token = self.stream.current
+                if token.type == "data":
+                    if token.value:
+                        add_data(nodes.TemplateData(token.value, lineno=token.lineno))
+                    next(self.stream)
+                elif token.type == "variable_begin":
+                    next(self.stream)
+                    add_data(self.parse_tuple(with_condexpr=True))
+                    self.stream.expect("variable_end")
+                elif token.type == "block_begin":
+                    flush_data()
+                    next(self.stream)
+                    if end_tokens is not None and self.stream.current.test_any(
+                        *end_tokens
+                    ):
+                        return body
+                    rv = self.parse_statement()
+                    if isinstance(rv, list):
+                        body.extend(rv)
+                    else:
+                        body.append(rv)
+                    self.stream.expect("block_end")
+                else:
+                    raise AssertionError("internal parsing error")
+
+            flush_data()
+        finally:
+            if end_tokens is not None:
+                self._end_token_stack.pop()
+
+        return body
+
+    def parse(self):
+        """Parse the whole template into a `Template` node."""
+        result = nodes.Template(self.subparse(), lineno=1)
+        result.set_environment(self.environment)
+        return result

env/lib/python3.5/site-packages/jinja2/runtime.py

+# -*- coding: utf-8 -*-
+"""The runtime functions and state used by compiled templates."""
+import sys
+from itertools import chain
+from types import MethodType
+
+from markupsafe import escape  # noqa: F401
+from markupsafe import Markup
+from markupsafe import soft_unicode
+
+from ._compat import abc
+from ._compat import imap
+from ._compat import implements_iterator
+from ._compat import implements_to_string
+from ._compat import iteritems
+from ._compat import PY2
+from ._compat import string_types
+from ._compat import text_type
+from ._compat import with_metaclass
+from .exceptions import TemplateNotFound  # noqa: F401
+from .exceptions import TemplateRuntimeError  # noqa: F401
+from .exceptions import UndefinedError
+from .nodes import EvalContext
+from .utils import concat
+from .utils import evalcontextfunction
+from .utils import internalcode
+from .utils import missing
+from .utils import Namespace  # noqa: F401
+from .utils import object_type_repr
+
+# these variables are exported to the template runtime
+exported = [
+    "LoopContext",
+    "TemplateReference",
+    "Macro",
+    "Markup",
+    "TemplateRuntimeError",
+    "missing",
+    "concat",
+    "escape",
+    "markup_join",
+    "unicode_join",
+    "to_string",
+    "identity",
+    "TemplateNotFound",
+    "Namespace",
+    "Undefined",
+]
+
+#: the name of the function that is used to convert something into
+#: a string.  We can just use the text type here.
+to_string = text_type
+
+
+def identity(x):
+    """Returns its argument. Useful for certain things in the
+    environment.
+    """
+    return x
+
+
+def markup_join(seq):
+    """Concatenation that escapes if necessary and converts to unicode."""
+    buf = []
+    iterator = imap(soft_unicode, seq)
+    for arg in iterator:
+        buf.append(arg)
+        if hasattr(arg, "__html__"):
+            return Markup(u"").join(chain(buf, iterator))
+    return concat(buf)
+
+
+def unicode_join(seq):
+    """Simple args to unicode conversion and concatenation."""
+    return concat(imap(text_type, seq))
+
+
+def new_context(
+    environment,
+    template_name,
+    blocks,
+    vars=None,
+    shared=None,
+    globals=None,
+    locals=None,
+):
+    """Internal helper for context creation."""
+    if vars is None:
+        vars = {}
+    if shared:
+        parent = vars
+    else:
+        parent = dict(globals or (), **vars)
+    if locals:
+        # if the parent is shared a copy should be created because
+        # we don't want to modify the dict passed
+        if shared:
+            parent = dict(parent)
+        for key, value in iteritems(locals):
+            if value is not missing:
+                parent[key] = value
+    return environment.context_class(environment, parent, template_name, blocks)
+
+
+class TemplateReference(object):
+    """The `self` in templates."""
+
+    def __init__(self, context):
+        self.__context = context
+
+    def __getitem__(self, name):
+        blocks = self.__context.blocks[name]
+        return BlockReference(name, self.__context, blocks, 0)
+
+    def __repr__(self):
+        return "<%s %r>" % (self.__class__.__name__, self.__context.name)
+
+
+def _get_func(x):
+    return getattr(x, "__func__", x)
+
+
+class ContextMeta(type):
+    def __new__(mcs, name, bases, d):
+        rv = type.__new__(mcs, name, bases, d)
+        if bases == ():
+            return rv
+
+        resolve = _get_func(rv.resolve)
+        default_resolve = _get_func(Context.resolve)
+        resolve_or_missing = _get_func(rv.resolve_or_missing)
+        default_resolve_or_missing = _get_func(Context.resolve_or_missing)
+
+        # If we have a changed resolve but no changed default or missing
+        # resolve we invert the call logic.
+        if (
+            resolve is not default_resolve
+            and resolve_or_missing is default_resolve_or_missing
+        ):
+            rv._legacy_resolve_mode = True
+        elif (
+            resolve is default_resolve
+            and resolve_or_missing is default_resolve_or_missing
+        ):
+            rv._fast_resolve_mode = True
+
+        return rv
+
+
+def resolve_or_missing(context, key, missing=missing):
+    if key in context.vars:
+        return context.vars[key]
+    if key in context.parent:
+        return context.parent[key]
+    return missing
+
+
+class Context(with_metaclass(ContextMeta)):
+    """The template context holds the variables of a template.  It stores the
+    values passed to the template and also the names the template exports.
+    Creating instances is neither supported nor useful as it's created
+    automatically at various stages of the template evaluation and should not
+    be created by hand.
+
+    The context is immutable.  Modifications on :attr:`parent` **must not**
+    happen and modifications on :attr:`vars` are allowed from generated
+    template code only.  Template filters and global functions marked as
+    :func:`contextfunction`\\s get the active context passed as first argument
+    and are allowed to access the context read-only.
+
+    The template context supports read only dict operations (`get`,
+    `keys`, `values`, `items`, `iterkeys`, `itervalues`, `iteritems`,
+    `__getitem__`, `__contains__`).  Additionally there is a :meth:`resolve`
+    method that doesn't fail with a `KeyError` but returns an
+    :class:`Undefined` object for missing variables.
+    """
+
+    # XXX: we want to eventually make this be a deprecation warning and
+    # remove it.
+    _legacy_resolve_mode = False
+    _fast_resolve_mode = False
+
+    def __init__(self, environment, parent, name, blocks):
+        self.parent = parent
+        self.vars = {}
+        self.environment = environment
+        self.eval_ctx = EvalContext(self.environment, name)
+        self.exported_vars = set()
+        self.name = name
+
+        # create the initial mapping of blocks.  Whenever template inheritance
+        # takes place the runtime will update this mapping with the new blocks
+        # from the template.
+        self.blocks = dict((k, [v]) for k, v in iteritems(blocks))
+
+        # In case we detect the fast resolve mode we can set up an alias
+        # here that bypasses the legacy code logic.
+        if self._fast_resolve_mode:
+            self.resolve_or_missing = MethodType(resolve_or_missing, self)
+
+    def super(self, name, current):
+        """Render a parent block."""
+        try:
+            blocks = self.blocks[name]
+            index = blocks.index(current) + 1
+            blocks[index]
+        except LookupError:
+            return self.environment.undefined(
+                "there is no parent block called %r." % name, name="super"
+            )
+        return BlockReference(name, self, blocks, index)
+
+    def get(self, key, default=None):
+        """Returns an item from the template context, if it doesn't exist
+        `default` is returned.
+        """
+        try:
+            return self[key]
+        except KeyError:
+            return default
+
+    def resolve(self, key):
+        """Looks up a variable like `__getitem__` or `get` but returns an
+        :class:`Undefined` object with the name of the name looked up.
+        """
+        if self._legacy_resolve_mode:
+            rv = resolve_or_missing(self, key)
+        else:
+            rv = self.resolve_or_missing(key)
+        if rv is missing:
+            return self.environment.undefined(name=key)
+        return rv
+
+    def resolve_or_missing(self, key):
+        """Resolves a variable like :meth:`resolve` but returns the
+        special `missing` value if it cannot be found.
+        """
+        if self._legacy_resolve_mode:
+            rv = self.resolve(key)
+            if isinstance(rv, Undefined):
+                rv = missing
+            return rv
+        return resolve_or_missing(self, key)
+
+    def get_exported(self):
+        """Get a new dict with the exported variables."""
+        return dict((k, self.vars[k]) for k in self.exported_vars)
+
+    def get_all(self):
+        """Return the complete context as dict including the exported
+        variables.  For optimizations reasons this might not return an
+        actual copy so be careful with using it.
+        """
+        if not self.vars:
+            return self.parent
+        if not self.parent:
+            return self.vars
+        return dict(self.parent, **self.vars)
+
+    @internalcode
+    def call(__self, __obj, *args, **kwargs):  # noqa: B902
+        """Call the callable with the arguments and keyword arguments
+        provided but inject the active context or environment as first
+        argument if the callable is a :func:`contextfunction` or
+        :func:`environmentfunction`.
+        """
+        if __debug__:
+            __traceback_hide__ = True  # noqa
+
+        # Allow callable classes to take a context
+        if hasattr(__obj, "__call__"):  # noqa: B004
+            fn = __obj.__call__
+            for fn_type in (
+                "contextfunction",
+                "evalcontextfunction",
+                "environmentfunction",
+            ):
+                if hasattr(fn, fn_type):
+                    __obj = fn
+                    break
+
+        if callable(__obj):
+            if getattr(__obj, "contextfunction", False) is True:
+                args = (__self,) + args
+            elif getattr(__obj, "evalcontextfunction", False) is True:
+                args = (__self.eval_ctx,) + args
+            elif getattr(__obj, "environmentfunction", False) is True:
+                args = (__self.environment,) + args
+        try:
+            return __obj(*args, **kwargs)
+        except StopIteration:
+            return __self.environment.undefined(
+                "value was undefined because "
+                "a callable raised a "
+                "StopIteration exception"
+            )
+
+    def derived(self, locals=None):
+        """Internal helper function to create a derived context.  This is
+        used in situations where the system needs a new context in the same
+        template that is independent.
+        """
+        context = new_context(
+            self.environment, self.name, {}, self.get_all(), True, None, locals
+        )
+        context.eval_ctx = self.eval_ctx
+        context.blocks.update((k, list(v)) for k, v in iteritems(self.blocks))
+        return context
+
+    def _all(meth):  # noqa: B902
+        def proxy(self):
+            return getattr(self.get_all(), meth)()
+
+        proxy.__doc__ = getattr(dict, meth).__doc__
+        proxy.__name__ = meth
+        return proxy
+
+    keys = _all("keys")
+    values = _all("values")
+    items = _all("items")
+
+    # not available on python 3
+    if PY2:
+        iterkeys = _all("iterkeys")
+        itervalues = _all("itervalues")
+        iteritems = _all("iteritems")
+    del _all
+
+    def __contains__(self, name):
+        return name in self.vars or name in self.parent
+
+    def __getitem__(self, key):
+        """Lookup a variable or raise `KeyError` if the variable is
+        undefined.
+        """
+        item = self.resolve_or_missing(key)
+        if item is missing:
+            raise KeyError(key)
+        return item
+
+    def __repr__(self):
+        return "<%s %s of %r>" % (
+            self.__class__.__name__,
+            repr(self.get_all()),
+            self.name,
+        )
+
+
+abc.Mapping.register(Context)
+
+
+class BlockReference(object):
+    """One block on a template reference."""
+
+    def __init__(self, name, context, stack, depth):
+        self.name = name
+        self._context = context
+        self._stack = stack
+        self._depth = depth
+
+    @property
+    def super(self):
+        """Super the block."""
+        if self._depth + 1 >= len(self._stack):
+            return self._context.environment.undefined(
+                "there is no parent block called %r." % self.name, name="super"
+            )
+        return BlockReference(self.name, self._context, self._stack, self._depth + 1)
+
+    @internalcode
+    def __call__(self):
+        rv = concat(self._stack[self._depth](self._context))
+        if self._context.eval_ctx.autoescape:
+            rv = Markup(rv)
+        return rv
+
+
+@implements_iterator
+class LoopContext:
+    """A wrapper iterable for dynamic ``for`` loops, with information
+    about the loop and iteration.
+    """
+
+    #: Current iteration of the loop, starting at 0.
+    index0 = -1
+
+    _length = None
+    _after = missing
+    _current = missing
+    _before = missing
+    _last_changed_value = missing
+
+    def __init__(self, iterable, undefined, recurse=None, depth0=0):
+        """
+        :param iterable: Iterable to wrap.
+        :param undefined: :class:`Undefined` class to use for next and
+            previous items.
+        :param recurse: The function to render the loop body when the
+            loop is marked recursive.
+        :param depth0: Incremented when looping recursively.
+        """
+        self._iterable = iterable
+        self._iterator = self._to_iterator(iterable)
+        self._undefined = undefined
+        self._recurse = recurse
+        #: How many levels deep a recursive loop currently is, starting at 0.
+        self.depth0 = depth0
+
+    @staticmethod
+    def _to_iterator(iterable):
+        return iter(iterable)
+
+    @property
+    def length(self):
+        """Length of the iterable.
+
+        If the iterable is a generator or otherwise does not have a
+        size, it is eagerly evaluated to get a size.
+        """
+        if self._length is not None:
+            return self._length
+
+        try:
+            self._length = len(self._iterable)
+        except TypeError:
+            iterable = list(self._iterator)
+            self._iterator = self._to_iterator(iterable)
+            self._length = len(iterable) + self.index + (self._after is not missing)
+
+        return self._length
+
+    def __len__(self):
+        return self.length
+
+    @property
+    def depth(self):
+        """How many levels deep a recursive loop currently is, starting at 1."""
+        return self.depth0 + 1
+
+    @property
+    def index(self):
+        """Current iteration of the loop, starting at 1."""
+        return self.index0 + 1
+
+    @property
+    def revindex0(self):
+        """Number of iterations from the end of the loop, ending at 0.
+
+        Requires calculating :attr:`length`.
+        """
+        return self.length - self.index
+
+    @property
+    def revindex(self):
+        """Number of iterations from the end of the loop, ending at 1.
+
+        Requires calculating :attr:`length`.
+        """
+        return self.length - self.index0
+
+    @property
+    def first(self):
+        """Whether this is the first iteration of the loop."""
+        return self.index0 == 0
+
+    def _peek_next(self):
+        """Return the next element in the iterable, or :data:`missing`
+        if the iterable is exhausted. Only peeks one item ahead, caching
+        the result in :attr:`_last` for use in subsequent checks. The
+        cache is reset when :meth:`__next__` is called.
+        """
+        if self._after is not missing:
+            return self._after
+
+        self._after = next(self._iterator, missing)
+        return self._after
+
+    @property
+    def last(self):
+        """Whether this is the last iteration of the loop.
+
+        Causes the iterable to advance early. See
+        :func:`itertools.groupby` for issues this can cause.
+        The :func:`groupby` filter avoids that issue.
+        """
+        return self._peek_next() is missing
+
+    @property
+    def previtem(self):
+        """The item in the previous iteration. Undefined during the
+        first iteration.
+        """
+        if self.first:
+            return self._undefined("there is no previous item")
+
+        return self._before
+
+    @property
+    def nextitem(self):
+        """The item in the next iteration. Undefined during the last
+        iteration.
+
+        Causes the iterable to advance early. See
+        :func:`itertools.groupby` for issues this can cause.
+        The :func:`groupby` filter avoids that issue.
+        """
+        rv = self._peek_next()
+
+        if rv is missing:
+            return self._undefined("there is no next item")
+
+        return rv
+
+    def cycle(self, *args):
+        """Return a value from the given args, cycling through based on
+        the current :attr:`index0`.
+
+        :param args: One or more values to cycle through.
+        """
+        if not args:
+            raise TypeError("no items for cycling given")
+
+        return args[self.index0 % len(args)]
+
+    def changed(self, *value):
+        """Return ``True`` if previously called with a different value
+        (including when called for the first time).
+
+        :param value: One or more values to compare to the last call.
+        """
+        if self._last_changed_value != value:
+            self._last_changed_value = value
+            return True
+
+        return False
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self._after is not missing:
+            rv = self._after
+            self._after = missing
+        else:
+            rv = next(self._iterator)
+
+        self.index0 += 1
+        self._before = self._current
+        self._current = rv
+        return rv, self
+
+    @internalcode
+    def __call__(self, iterable):
+        """When iterating over nested data, render the body of the loop
+        recursively with the given inner iterable data.
+
+        The loop must have the ``recursive`` marker for this to work.
+        """
+        if self._recurse is None:
+            raise TypeError(
+                "The loop must have the 'recursive' marker to be called recursively."
+            )
+
+        return self._recurse(iterable, self._recurse, depth=self.depth)
+
+    def __repr__(self):
+        return "<%s %d/%d>" % (self.__class__.__name__, self.index, self.length)
+
+
+class Macro(object):
+    """Wraps a macro function."""
+
+    def __init__(
+        self,
+        environment,
+        func,
+        name,
+        arguments,
+        catch_kwargs,
+        catch_varargs,
+        caller,
+        default_autoescape=None,
+    ):
+        self._environment = environment
+        self._func = func
+        self._argument_count = len(arguments)
+        self.name = name
+        self.arguments = arguments
+        self.catch_kwargs = catch_kwargs
+        self.catch_varargs = catch_varargs
+        self.caller = caller
+        self.explicit_caller = "caller" in arguments
+        if default_autoescape is None:
+            default_autoescape = environment.autoescape
+        self._default_autoescape = default_autoescape
+
+    @internalcode
+    @evalcontextfunction
+    def __call__(self, *args, **kwargs):
+        # This requires a bit of explanation,  In the past we used to
+        # decide largely based on compile-time information if a macro is
+        # safe or unsafe.  While there was a volatile mode it was largely
+        # unused for deciding on escaping.  This turns out to be
+        # problematic for macros because whether a macro is safe depends not
+        # on the escape mode when it was defined, but rather when it was used.
+        #
+        # Because however we export macros from the module system and
+        # there are historic callers that do not pass an eval context (and
+        # will continue to not pass one), we need to perform an instance
+        # check here.
+        #
+        # This is considered safe because an eval context is not a valid
+        # argument to callables otherwise anyway.  Worst case here is
+        # that if no eval context is passed we fall back to the compile
+        # time autoescape flag.
+        if args and isinstance(args[0], EvalContext):
+            autoescape = args[0].autoescape
+            args = args[1:]
+        else:
+            autoescape = self._default_autoescape
+
+        # try to consume the positional arguments
+        arguments = list(args[: self._argument_count])
+        off = len(arguments)
+
+        # For information why this is necessary refer to the handling
+        # of caller in the `macro_body` handler in the compiler.
+        found_caller = False
+
+        # if the number of arguments consumed is not the number of
+        # arguments expected we start filling in keyword arguments
+        # and defaults.
+        if off != self._argument_count:
+            for name in self.arguments[len(arguments) :]:
+                try:
+                    value = kwargs.pop(name)
+                except KeyError:
+                    value = missing
+                if name == "caller":
+                    found_caller = True
+                arguments.append(value)
+        else:
+            found_caller = self.explicit_caller
+
+        # it's important that the order of these arguments does not change
+        # if not also changed in the compiler's `function_scoping` method.
+        # the order is caller, keyword arguments, positional arguments!
+        if self.caller and not found_caller:
+            caller = kwargs.pop("caller", None)
+            if caller is None:
+                caller = self._environment.undefined("No caller defined", name="caller")
+            arguments.append(caller)
+
+        if self.catch_kwargs:
+            arguments.append(kwargs)
+        elif kwargs:
+            if "caller" in kwargs:
+                raise TypeError(
+                    "macro %r was invoked with two values for "
+                    "the special caller argument.  This is "
+                    "most likely a bug." % self.name
+                )
+            raise TypeError(
+                "macro %r takes no keyword argument %r"
+                % (self.name, next(iter(kwargs)))
+            )
+        if self.catch_varargs:
+            arguments.append(args[self._argument_count :])
+        elif len(args) > self._argument_count:
+            raise TypeError(
+                "macro %r takes not more than %d argument(s)"
+                % (self.name, len(self.arguments))
+            )
+
+        return self._invoke(arguments, autoescape)
+
+    def _invoke(self, arguments, autoescape):
+        """This method is being swapped out by the async implementation."""
+        rv = self._func(*arguments)
+        if autoescape:
+            rv = Markup(rv)
+        return rv
+
+    def __repr__(self):
+        return "<%s %s>" % (
+            self.__class__.__name__,
+            self.name is None and "anonymous" or repr(self.name),
+        )
+
+
+@implements_to_string
+class Undefined(object):
+    """The default undefined type.  This undefined type can be printed and
+    iterated over, but every other access will raise an :exc:`UndefinedError`:
+
+    >>> foo = Undefined(name='foo')
+    >>> str(foo)
+    ''
+    >>> not foo
+    True
+    >>> foo + 42
+    Traceback (most recent call last):
+      ...
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
+    """
+
+    __slots__ = (
+        "_undefined_hint",
+        "_undefined_obj",
+        "_undefined_name",
+        "_undefined_exception",
+    )
+
+    def __init__(self, hint=None, obj=missing, name=None, exc=UndefinedError):
+        self._undefined_hint = hint
+        self._undefined_obj = obj
+        self._undefined_name = name
+        self._undefined_exception = exc
+
+    @property
+    def _undefined_message(self):
+        """Build a message about the undefined value based on how it was
+        accessed.
+        """
+        if self._undefined_hint:
+            return self._undefined_hint
+
+        if self._undefined_obj is missing:
+            return "%r is undefined" % self._undefined_name
+
+        if not isinstance(self._undefined_name, string_types):
+            return "%s has no element %r" % (
+                object_type_repr(self._undefined_obj),
+                self._undefined_name,
+            )
+
+        return "%r has no attribute %r" % (
+            object_type_repr(self._undefined_obj),
+            self._undefined_name,
+        )
+
+    @internalcode
+    def _fail_with_undefined_error(self, *args, **kwargs):
+        """Raise an :exc:`UndefinedError` when operations are performed
+        on the undefined value.
+        """
+        raise self._undefined_exception(self._undefined_message)
+
+    @internalcode
+    def __getattr__(self, name):
+        if name[:2] == "__":
+            raise AttributeError(name)
+        return self._fail_with_undefined_error()
+
+    __add__ = (
+        __radd__
+    ) = (
+        __mul__
+    ) = (
+        __rmul__
+    ) = (
+        __div__
+    ) = (
+        __rdiv__
+    ) = (
+        __truediv__
+    ) = (
+        __rtruediv__
+    ) = (
+        __floordiv__
+    ) = (
+        __rfloordiv__
+    ) = (
+        __mod__
+    ) = (
+        __rmod__
+    ) = (
+        __pos__
+    ) = (
+        __neg__
+    ) = (
+        __call__
+    ) = (
+        __getitem__
+    ) = (
+        __lt__
+    ) = (
+        __le__
+    ) = (
+        __gt__
+    ) = (
+        __ge__
+    ) = (
+        __int__
+    ) = (
+        __float__
+    ) = (
+        __complex__
+    ) = __pow__ = __rpow__ = __sub__ = __rsub__ = _fail_with_undefined_error
+
+    def __eq__(self, other):
+        return type(self) is type(other)
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
+    def __hash__(self):
+        return id(type(self))
+
+    def __str__(self):
+        return u""
+
+    def __len__(self):
+        return 0
+
+    def __iter__(self):
+        if 0:
+            yield None
+
+    def __nonzero__(self):
+        return False
+
+    __bool__ = __nonzero__
+
+    def __repr__(self):
+        return "Undefined"
+
+
+def make_logging_undefined(logger=None, base=None):
+    """Given a logger object this returns a new undefined class that will
+    log certain failures.  It will log iterations and printing.  If no
+    logger is given a default logger is created.
+
+    Example::
+
+        logger = logging.getLogger(__name__)
+        LoggingUndefined = make_logging_undefined(
+            logger=logger,
+            base=Undefined
+        )
+
+    .. versionadded:: 2.8
+
+    :param logger: the logger to use.  If not provided, a default logger
+                   is created.
+    :param base: the base class to add logging functionality to.  This
+                 defaults to :class:`Undefined`.
+    """
+    if logger is None:
+        import logging
+
+        logger = logging.getLogger(__name__)
+        logger.addHandler(logging.StreamHandler(sys.stderr))
+    if base is None:
+        base = Undefined
+
+    def _log_message(undef):
+        if undef._undefined_hint is None:
+            if undef._undefined_obj is missing:
+                hint = "%s is undefined" % undef._undefined_name
+            elif not isinstance(undef._undefined_name, string_types):
+                hint = "%s has no element %s" % (
+                    object_type_repr(undef._undefined_obj),
+                    undef._undefined_name,
+                )
+            else:
+                hint = "%s has no attribute %s" % (
+                    object_type_repr(undef._undefined_obj),
+                    undef._undefined_name,
+                )
+        else:
+            hint = undef._undefined_hint
+        logger.warning("Template variable warning: %s", hint)
+
+    class LoggingUndefined(base):
+        def _fail_with_undefined_error(self, *args, **kwargs):
+            try:
+                return base._fail_with_undefined_error(self, *args, **kwargs)
+            except self._undefined_exception as e:
+                logger.error("Template variable error: %s", str(e))
+                raise e
+
+        def __str__(self):
+            rv = base.__str__(self)
+            _log_message(self)
+            return rv
+
+        def __iter__(self):
+            rv = base.__iter__(self)
+            _log_message(self)
+            return rv
+
+        if PY2:
+
+            def __nonzero__(self):
+                rv = base.__nonzero__(self)
+                _log_message(self)
+                return rv
+
+            def __unicode__(self):
+                rv = base.__unicode__(self)
+                _log_message(self)
+                return rv
+
+        else:
+
+            def __bool__(self):
+                rv = base.__bool__(self)
+                _log_message(self)
+                return rv
+
+    return LoggingUndefined
+
+
+# No @implements_to_string decorator here because __str__
+# is not overwritten from Undefined in this class.
+# This would cause a recursion error in Python 2.
+class ChainableUndefined(Undefined):
+    """An undefined that is chainable, where both ``__getattr__`` and
+    ``__getitem__`` return itself rather than raising an
+    :exc:`UndefinedError`.
+
+    >>> foo = ChainableUndefined(name='foo')
+    >>> str(foo.bar['baz'])
+    ''
+    >>> foo.bar['baz'] + 42
+    Traceback (most recent call last):
+      ...
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
+
+    .. versionadded:: 2.11.0
+    """
+
+    __slots__ = ()
+
+    def __html__(self):
+        return self.__str__()
+
+    def __getattr__(self, _):
+        return self
+
+    __getitem__ = __getattr__
+
+
+@implements_to_string
+class DebugUndefined(Undefined):
+    """An undefined that returns the debug info when printed.
+
+    >>> foo = DebugUndefined(name='foo')
+    >>> str(foo)
+    '{{ foo }}'
+    >>> not foo
+    True
+    >>> foo + 42
+    Traceback (most recent call last):
+      ...
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
+    """
+
+    __slots__ = ()
+
+    def __str__(self):
+        if self._undefined_hint is None:
+            if self._undefined_obj is missing:
+                return u"{{ %s }}" % self._undefined_name
+            return "{{ no such element: %s[%r] }}" % (
+                object_type_repr(self._undefined_obj),
+                self._undefined_name,
+            )
+        return u"{{ undefined value printed: %s }}" % self._undefined_hint
+
+
+@implements_to_string
+class StrictUndefined(Undefined):
+    """An undefined that barks on print and iteration as well as boolean
+    tests and all kinds of comparisons.  In other words: you can do nothing
+    with it except checking if it's defined using the `defined` test.
+
+    >>> foo = StrictUndefined(name='foo')
+    >>> str(foo)
+    Traceback (most recent call last):
+      ...
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
+    >>> not foo
+    Traceback (most recent call last):
+      ...
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
+    >>> foo + 42
+    Traceback (most recent call last):
+      ...
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
+    """
+
+    __slots__ = ()
+    __iter__ = (
+        __str__
+    ) = (
+        __len__
+    ) = (
+        __nonzero__
+    ) = __eq__ = __ne__ = __bool__ = __hash__ = Undefined._fail_with_undefined_error
+
+
+# remove remaining slots attributes, after the metaclass did the magic they
+# are unneeded and irritating as they contain wrong data for the subclasses.
+del (
+    Undefined.__slots__,
+    ChainableUndefined.__slots__,
+    DebugUndefined.__slots__,
+    StrictUndefined.__slots__,
+)

env/lib/python3.5/site-packages/jinja2/sandbox.py

+# -*- coding: utf-8 -*-
+"""A sandbox layer that ensures unsafe operations cannot be performed.
+Useful when the template itself comes from an untrusted source.
+"""
+import operator
+import types
+import warnings
+from collections import deque
+from string import Formatter
+
+from markupsafe import EscapeFormatter
+from markupsafe import Markup
+
+from ._compat import abc
+from ._compat import PY2
+from ._compat import range_type
+from ._compat import string_types
+from .environment import Environment
+from .exceptions import SecurityError
+
+#: maximum number of items a range may produce
+MAX_RANGE = 100000
+
+#: attributes of function objects that are considered unsafe.
+if PY2:
+    UNSAFE_FUNCTION_ATTRIBUTES = {
+        "func_closure",
+        "func_code",
+        "func_dict",
+        "func_defaults",
+        "func_globals",
+    }
+else:
+    # On versions > python 2 the special attributes on functions are gone,
+    # but they remain on methods and generators for whatever reason.
+    UNSAFE_FUNCTION_ATTRIBUTES = set()
+
+#: unsafe method attributes.  function attributes are unsafe for methods too
+UNSAFE_METHOD_ATTRIBUTES = {"im_class", "im_func", "im_self"}
+
+#: unsafe generator attributes.
+UNSAFE_GENERATOR_ATTRIBUTES = {"gi_frame", "gi_code"}
+
+#: unsafe attributes on coroutines
+UNSAFE_COROUTINE_ATTRIBUTES = {"cr_frame", "cr_code"}
+
+#: unsafe attributes on async generators
+UNSAFE_ASYNC_GENERATOR_ATTRIBUTES = {"ag_code", "ag_frame"}
+
+# make sure we don't warn in python 2.6 about stuff we don't care about
+warnings.filterwarnings(
+    "ignore", "the sets module", DeprecationWarning, module=__name__
+)
+
+_mutable_set_types = (set,)
+_mutable_mapping_types = (dict,)
+_mutable_sequence_types = (list,)
+
+# on python 2.x we can register the user collection types
+try:
+    from UserDict import UserDict, DictMixin
+    from UserList import UserList
+
+    _mutable_mapping_types += (UserDict, DictMixin)
+    _mutable_set_types += (UserList,)
+except ImportError:
+    pass
+
+# if sets is still available, register the mutable set from there as well
+try:
+    from sets import Set
+
+    _mutable_set_types += (Set,)
+except ImportError:
+    pass
+
+#: register Python 2.6 abstract base classes
+_mutable_set_types += (abc.MutableSet,)
+_mutable_mapping_types += (abc.MutableMapping,)
+_mutable_sequence_types += (abc.MutableSequence,)
+
+_mutable_spec = (
+    (
+        _mutable_set_types,
+        frozenset(
+            [
+                "add",
+                "clear",
+                "difference_update",
+                "discard",
+                "pop",
+                "remove",
+                "symmetric_difference_update",
+                "update",
+            ]
+        ),
+    ),
+    (
+        _mutable_mapping_types,
+        frozenset(["clear", "pop", "popitem", "setdefault", "update"]),
+    ),
+    (
+        _mutable_sequence_types,
+        frozenset(["append", "reverse", "insert", "sort", "extend", "remove"]),
+    ),
+    (
+        deque,
+        frozenset(
+            [
+                "append",
+                "appendleft",
+                "clear",
+                "extend",
+                "extendleft",
+                "pop",
+                "popleft",
+                "remove",
+                "rotate",
+            ]
+        ),
+    ),
+)
+
+
+class _MagicFormatMapping(abc.Mapping):
+    """This class implements a dummy wrapper to fix a bug in the Python
+    standard library for string formatting.
+
+    See https://bugs.python.org/issue13598 for information about why
+    this is necessary.
+    """
+
+    def __init__(self, args, kwargs):
+        self._args = args
+        self._kwargs = kwargs
+        self._last_index = 0
+
+    def __getitem__(self, key):
+        if key == "":
+            idx = self._last_index
+            self._last_index += 1
+            try:
+                return self._args[idx]
+            except LookupError:
+                pass
+            key = str(idx)
+        return self._kwargs[key]
+
+    def __iter__(self):
+        return iter(self._kwargs)
+
+    def __len__(self):
+        return len(self._kwargs)
+
+
+def inspect_format_method(callable):
+    if not isinstance(
+        callable, (types.MethodType, types.BuiltinMethodType)
+    ) or callable.__name__ not in ("format", "format_map"):
+        return None
+    obj = callable.__self__
+    if isinstance(obj, string_types):
+        return obj
+
+
+def safe_range(*args):
+    """A range that can't generate ranges with a length of more than
+    MAX_RANGE items.
+    """
+    rng = range_type(*args)
+
+    if len(rng) > MAX_RANGE:
+        raise OverflowError(
+            "Range too big. The sandbox blocks ranges larger than"
+            " MAX_RANGE (%d)." % MAX_RANGE
+        )
+
+    return rng
+
+
+def unsafe(f):
+    """Marks a function or method as unsafe.
+
+    ::
+
+        @unsafe
+        def delete(self):
+            pass
+    """
+    f.unsafe_callable = True
+    return f
+
+
+def is_internal_attribute(obj, attr):
+    """Test if the attribute given is an internal python attribute.  For
+    example this function returns `True` for the `func_code` attribute of
+    python objects.  This is useful if the environment method
+    :meth:`~SandboxedEnvironment.is_safe_attribute` is overridden.
+
+    >>> from jinja2.sandbox import is_internal_attribute
+    >>> is_internal_attribute(str, "mro")
+    True
+    >>> is_internal_attribute(str, "upper")
+    False
+    """
+    if isinstance(obj, types.FunctionType):
+        if attr in UNSAFE_FUNCTION_ATTRIBUTES:
+            return True
+    elif isinstance(obj, types.MethodType):
+        if attr in UNSAFE_FUNCTION_ATTRIBUTES or attr in UNSAFE_METHOD_ATTRIBUTES:
+            return True
+    elif isinstance(obj, type):
+        if attr == "mro":
+            return True
+    elif isinstance(obj, (types.CodeType, types.TracebackType, types.FrameType)):
+        return True
+    elif isinstance(obj, types.GeneratorType):
+        if attr in UNSAFE_GENERATOR_ATTRIBUTES:
+            return True
+    elif hasattr(types, "CoroutineType") and isinstance(obj, types.CoroutineType):
+        if attr in UNSAFE_COROUTINE_ATTRIBUTES:
+            return True
+    elif hasattr(types, "AsyncGeneratorType") and isinstance(
+        obj, types.AsyncGeneratorType
+    ):
+        if attr in UNSAFE_ASYNC_GENERATOR_ATTRIBUTES:
+            return True
+    return attr.startswith("__")
+
+
+def modifies_known_mutable(obj, attr):
+    """This function checks if an attribute on a builtin mutable object
+    (list, dict, set or deque) would modify it if called.  It also supports
+    the "user"-versions of the objects (`sets.Set`, `UserDict.*` etc.) and
+    with Python 2.6 onwards the abstract base classes `MutableSet`,
+    `MutableMapping`, and `MutableSequence`.
+
+    >>> modifies_known_mutable({}, "clear")
+    True
+    >>> modifies_known_mutable({}, "keys")
+    False
+    >>> modifies_known_mutable([], "append")
+    True
+    >>> modifies_known_mutable([], "index")
+    False
+
+    If called with an unsupported object (such as unicode) `False` is
+    returned.
+
+    >>> modifies_known_mutable("foo", "upper")
+    False
+    """
+    for typespec, unsafe in _mutable_spec:
+        if isinstance(obj, typespec):
+            return attr in unsafe
+    return False
+
+
+class SandboxedEnvironment(Environment):
+    """The sandboxed environment.  It works like the regular environment but
+    tells the compiler to generate sandboxed code.  Additionally subclasses of
+    this environment may override the methods that tell the runtime what
+    attributes or functions are safe to access.
+
+    If the template tries to access insecure code a :exc:`SecurityError` is
+    raised.  However also other exceptions may occur during the rendering so
+    the caller has to ensure that all exceptions are caught.
+    """
+
+    sandboxed = True
+
+    #: default callback table for the binary operators.  A copy of this is
+    #: available on each instance of a sandboxed environment as
+    #: :attr:`binop_table`
+    default_binop_table = {
+        "+": operator.add,
+        "-": operator.sub,
+        "*": operator.mul,
+        "/": operator.truediv,
+        "//": operator.floordiv,
+        "**": operator.pow,
+        "%": operator.mod,
+    }
+
+    #: default callback table for the unary operators.  A copy of this is
+    #: available on each instance of a sandboxed environment as
+    #: :attr:`unop_table`
+    default_unop_table = {"+": operator.pos, "-": operator.neg}
+
+    #: a set of binary operators that should be intercepted.  Each operator
+    #: that is added to this set (empty by default) is delegated to the
+    #: :meth:`call_binop` method that will perform the operator.  The default
+    #: operator callback is specified by :attr:`binop_table`.
+    #:
+    #: The following binary operators are interceptable:
+    #: ``//``, ``%``, ``+``, ``*``, ``-``, ``/``, and ``**``
+    #:
+    #: The default operation form the operator table corresponds to the
+    #: builtin function.  Intercepted calls are always slower than the native
+    #: operator call, so make sure only to intercept the ones you are
+    #: interested in.
+    #:
+    #: .. versionadded:: 2.6
+    intercepted_binops = frozenset()
+
+    #: a set of unary operators that should be intercepted.  Each operator
+    #: that is added to this set (empty by default) is delegated to the
+    #: :meth:`call_unop` method that will perform the operator.  The default
+    #: operator callback is specified by :attr:`unop_table`.
+    #:
+    #: The following unary operators are interceptable: ``+``, ``-``
+    #:
+    #: The default operation form the operator table corresponds to the
+    #: builtin function.  Intercepted calls are always slower than the native
+    #: operator call, so make sure only to intercept the ones you are
+    #: interested in.
+    #:
+    #: .. versionadded:: 2.6
+    intercepted_unops = frozenset()
+
+    def intercept_unop(self, operator):
+        """Called during template compilation with the name of a unary
+        operator to check if it should be intercepted at runtime.  If this
+        method returns `True`, :meth:`call_unop` is executed for this unary
+        operator.  The default implementation of :meth:`call_unop` will use
+        the :attr:`unop_table` dictionary to perform the operator with the
+        same logic as the builtin one.
+
+        The following unary operators are interceptable: ``+`` and ``-``
+
+        Intercepted calls are always slower than the native operator call,
+        so make sure only to intercept the ones you are interested in.
+
+        .. versionadded:: 2.6
+        """
+        return False
+
+    def __init__(self, *args, **kwargs):
+        Environment.__init__(self, *args, **kwargs)
+        self.globals["range"] = safe_range
+        self.binop_table = self.default_binop_table.copy()
+        self.unop_table = self.default_unop_table.copy()
+
+    def is_safe_attribute(self, obj, attr, value):
+        """The sandboxed environment will call this method to check if the
+        attribute of an object is safe to access.  Per default all attributes
+        starting with an underscore are considered private as well as the
+        special attributes of internal python objects as returned by the
+        :func:`is_internal_attribute` function.
+        """
+        return not (attr.startswith("_") or is_internal_attribute(obj, attr))
+
+    def is_safe_callable(self, obj):
+        """Check if an object is safely callable.  Per default a function is
+        considered safe unless the `unsafe_callable` attribute exists and is
+        True.  Override this method to alter the behavior, but this won't
+        affect the `unsafe` decorator from this module.
+        """
+        return not (
+            getattr(obj, "unsafe_callable", False) or getattr(obj, "alters_data", False)
+        )
+
+    def call_binop(self, context, operator, left, right):
+        """For intercepted binary operator calls (:meth:`intercepted_binops`)
+        this function is executed instead of the builtin operator.  This can
+        be used to fine tune the behavior of certain operators.
+
+        .. versionadded:: 2.6
+        """
+        return self.binop_table[operator](left, right)
+
+    def call_unop(self, context, operator, arg):
+        """For intercepted unary operator calls (:meth:`intercepted_unops`)
+        this function is executed instead of the builtin operator.  This can
+        be used to fine tune the behavior of certain operators.
+
+        .. versionadded:: 2.6
+        """
+        return self.unop_table[operator](arg)
+
+    def getitem(self, obj, argument):
+        """Subscribe an object from sandboxed code."""
+        try:
+            return obj[argument]
+        except (TypeError, LookupError):
+            if isinstance(argument, string_types):
+                try:
+                    attr = str(argument)
+                except Exception:
+                    pass
+                else:
+                    try:
+                        value = getattr(obj, attr)
+                    except AttributeError:
+                        pass
+                    else:
+                        if self.is_safe_attribute(obj, argument, value):
+                            return value
+                        return self.unsafe_undefined(obj, argument)
+        return self.undefined(obj=obj, name=argument)
+
+    def getattr(self, obj, attribute):
+        """Subscribe an object from sandboxed code and prefer the
+        attribute.  The attribute passed *must* be a bytestring.
+        """
+        try:
+            value = getattr(obj, attribute)
+        except AttributeError:
+            try:
+                return obj[attribute]
+            except (TypeError, LookupError):
+                pass
+        else:
+            if self.is_safe_attribute(obj, attribute, value):
+                return value
+            return self.unsafe_undefined(obj, attribute)
+        return self.undefined(obj=obj, name=attribute)
+
+    def unsafe_undefined(self, obj, attribute):
+        """Return an undefined object for unsafe attributes."""
+        return self.undefined(
+            "access to attribute %r of %r "
+            "object is unsafe." % (attribute, obj.__class__.__name__),
+            name=attribute,
+            obj=obj,
+            exc=SecurityError,
+        )
+
+    def format_string(self, s, args, kwargs, format_func=None):
+        """If a format call is detected, then this is routed through this
+        method so that our safety sandbox can be used for it.
+        """
+        if isinstance(s, Markup):
+            formatter = SandboxedEscapeFormatter(self, s.escape)
+        else:
+            formatter = SandboxedFormatter(self)
+
+        if format_func is not None and format_func.__name__ == "format_map":
+            if len(args) != 1 or kwargs:
+                raise TypeError(
+                    "format_map() takes exactly one argument %d given"
+                    % (len(args) + (kwargs is not None))
+                )
+
+            kwargs = args[0]
+            args = None
+
+        kwargs = _MagicFormatMapping(args, kwargs)
+        rv = formatter.vformat(s, args, kwargs)
+        return type(s)(rv)
+
+    def call(__self, __context, __obj, *args, **kwargs):  # noqa: B902
+        """Call an object from sandboxed code."""
+        fmt = inspect_format_method(__obj)
+        if fmt is not None:
+            return __self.format_string(fmt, args, kwargs, __obj)
+
+        # the double prefixes are to avoid double keyword argument
+        # errors when proxying the call.
+        if not __self.is_safe_callable(__obj):
+            raise SecurityError("%r is not safely callable" % (__obj,))
+        return __context.call(__obj, *args, **kwargs)
+
+
+class ImmutableSandboxedEnvironment(SandboxedEnvironment):
+    """Works exactly like the regular `SandboxedEnvironment` but does not
+    permit modifications on the builtin mutable objects `list`, `set`, and
+    `dict` by using the :func:`modifies_known_mutable` function.
+    """
+
+    def is_safe_attribute(self, obj, attr, value):
+        if not SandboxedEnvironment.is_safe_attribute(self, obj, attr, value):
+            return False
+        return not modifies_known_mutable(obj, attr)
+
+
+# This really is not a public API apparently.
+try:
+    from _string import formatter_field_name_split
+except ImportError:
+
+    def formatter_field_name_split(field_name):
+        return field_name._formatter_field_name_split()
+
+
+class SandboxedFormatterMixin(object):
+    def __init__(self, env):
+        self._env = env
+
+    def get_field(self, field_name, args, kwargs):
+        first, rest = formatter_field_name_split(field_name)
+        obj = self.get_value(first, args, kwargs)
+        for is_attr, i in rest:
+            if is_attr:
+                obj = self._env.getattr(obj, i)
+            else:
+                obj = self._env.getitem(obj, i)
+        return obj, first
+
+
+class SandboxedFormatter(SandboxedFormatterMixin, Formatter):
+    def __init__(self, env):
+        SandboxedFormatterMixin.__init__(self, env)
+        Formatter.__init__(self)
+
+
+class SandboxedEscapeFormatter(SandboxedFormatterMixin, EscapeFormatter):
+    def __init__(self, env, escape):
+        SandboxedFormatterMixin.__init__(self, env)
+        EscapeFormatter.__init__(self, escape)

env/lib/python3.5/site-packages/jinja2/tests.py

+# -*- coding: utf-8 -*-
+"""Built-in template tests used with the ``is`` operator."""
+import decimal
+import operator
+import re
+
+from ._compat import abc
+from ._compat import integer_types
+from ._compat import string_types
+from ._compat import text_type
+from .runtime import Undefined
+
+number_re = re.compile(r"^-?\d+(\.\d+)?$")
+regex_type = type(number_re)
+test_callable = callable
+
+
+def test_odd(value):
+    """Return true if the variable is odd."""
+    return value % 2 == 1
+
+
+def test_even(value):
+    """Return true if the variable is even."""
+    return value % 2 == 0
+
+
+def test_divisibleby(value, num):
+    """Check if a variable is divisible by a number."""
+    return value % num == 0
+
+
+def test_defined(value):
+    """Return true if the variable is defined:
+
+    .. sourcecode:: jinja
+
+        {% if variable is defined %}
+            value of variable: {{ variable }}
+        {% else %}
+            variable is not defined
+        {% endif %}
+
+    See the :func:`default` filter for a simple way to set undefined
+    variables.
+    """
+    return not isinstance(value, Undefined)
+
+
+def test_undefined(value):
+    """Like :func:`defined` but the other way round."""
+    return isinstance(value, Undefined)
+
+
+def test_none(value):
+    """Return true if the variable is none."""
+    return value is None
+
+
+def test_boolean(value):
+    """Return true if the object is a boolean value.
+
+    .. versionadded:: 2.11
+    """
+    return value is True or value is False
+
+
+def test_false(value):
+    """Return true if the object is False.
+
+    .. versionadded:: 2.11
+    """
+    return value is False
+
+
+def test_true(value):
+    """Return true if the object is True.
+
+    .. versionadded:: 2.11
+    """
+    return value is True
+
+
+# NOTE: The existing 'number' test matches booleans and floats
+def test_integer(value):
+    """Return true if the object is an integer.
+
+    .. versionadded:: 2.11
+    """
+    return isinstance(value, integer_types) and value is not True and value is not False
+
+
+# NOTE: The existing 'number' test matches booleans and integers
+def test_float(value):
+    """Return true if the object is a float.
+
+    .. versionadded:: 2.11
+    """
+    return isinstance(value, float)
+
+
+def test_lower(value):
+    """Return true if the variable is lowercased."""
+    return text_type(value).islower()
+
+
+def test_upper(value):
+    """Return true if the variable is uppercased."""
+    return text_type(value).isupper()
+
+
+def test_string(value):
+    """Return true if the object is a string."""
+    return isinstance(value, string_types)
+
+
+def test_mapping(value):
+    """Return true if the object is a mapping (dict etc.).
+
+    .. versionadded:: 2.6
+    """
+    return isinstance(value, abc.Mapping)
+
+
+def test_number(value):
+    """Return true if the variable is a number."""
+    return isinstance(value, integer_types + (float, complex, decimal.Decimal))
+
+
+def test_sequence(value):
+    """Return true if the variable is a sequence. Sequences are variables
+    that are iterable.
+    """
+    try:
+        len(value)
+        value.__getitem__
+    except Exception:
+        return False
+    return True
+
+
+def test_sameas(value, other):
+    """Check if an object points to the same memory address than another
+    object:
+
+    .. sourcecode:: jinja
+
+        {% if foo.attribute is sameas false %}
+            the foo attribute really is the `False` singleton
+        {% endif %}
+    """
+    return value is other
+
+
+def test_iterable(value):
+    """Check if it's possible to iterate over an object."""
+    try:
+        iter(value)
+    except TypeError:
+        return False
+    return True
+
+
+def test_escaped(value):
+    """Check if the value is escaped."""
+    return hasattr(value, "__html__")
+
+
+def test_in(value, seq):
+    """Check if value is in seq.
+
+    .. versionadded:: 2.10
+    """
+    return value in seq
+
+
+TESTS = {
+    "odd": test_odd,
+    "even": test_even,
+    "divisibleby": test_divisibleby,
+    "defined": test_defined,
+    "undefined": test_undefined,
+    "none": test_none,
+    "boolean": test_boolean,
+    "false": test_false,
+    "true": test_true,
+    "integer": test_integer,
+    "float": test_float,
+    "lower": test_lower,
+    "upper": test_upper,
+    "string": test_string,
+    "mapping": test_mapping,
+    "number": test_number,
+    "sequence": test_sequence,
+    "iterable": test_iterable,
+    "callable": test_callable,
+    "sameas": test_sameas,
+    "escaped": test_escaped,
+    "in": test_in,
+    "==": operator.eq,
+    "eq": operator.eq,
+    "equalto": operator.eq,
+    "!=": operator.ne,
+    "ne": operator.ne,
+    ">": operator.gt,
+    "gt": operator.gt,
+    "greaterthan": operator.gt,
+    "ge": operator.ge,
+    ">=": operator.ge,
+    "<": operator.lt,
+    "lt": operator.lt,
+    "lessthan": operator.lt,
+    "<=": operator.le,
+    "le": operator.le,
+}

env/lib/python3.5/site-packages/jinja2/utils.py

+# -*- coding: utf-8 -*-
+import json
+import os
+import re
+import warnings
+from collections import deque
+from random import choice
+from random import randrange
+from threading import Lock
+
+from markupsafe import escape
+from markupsafe import Markup
+
+from ._compat import abc
+from ._compat import string_types
+from ._compat import text_type
+from ._compat import url_quote
+
+_word_split_re = re.compile(r"(\s+)")
+_punctuation_re = re.compile(
+    "^(?P<lead>(?:%s)*)(?P<middle>.*?)(?P<trail>(?:%s)*)$"
+    % (
+        "|".join(map(re.escape, ("(", "<", "&lt;"))),
+        "|".join(map(re.escape, (".", ",", ")", ">", "\n", "&gt;"))),
+    )
+)
+_simple_email_re = re.compile(r"^\S+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+$")
+_striptags_re = re.compile(r"(<!--.*?-->|<[^>]*>)")
+_entity_re = re.compile(r"&([^;]+);")
+_letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+_digits = "0123456789"
+
+# special singleton representing missing values for the runtime
+missing = type("MissingType", (), {"__repr__": lambda x: "missing"})()
+
+# internal code
+internal_code = set()
+
+concat = u"".join
+
+_slash_escape = "\\/" not in json.dumps("/")
+
+
+def contextfunction(f):
+    """This decorator can be used to mark a function or method context callable.
+    A context callable is passed the active :class:`Context` as first argument when
+    called from the template.  This is useful if a function wants to get access
+    to the context or functions provided on the context object.  For example
+    a function that returns a sorted list of template variables the current
+    template exports could look like this::
+
+        @contextfunction
+        def get_exported_names(context):
+            return sorted(context.exported_vars)
+    """
+    f.contextfunction = True
+    return f
+
+
+def evalcontextfunction(f):
+    """This decorator can be used to mark a function or method as an eval
+    context callable.  This is similar to the :func:`contextfunction`
+    but instead of passing the context, an evaluation context object is
+    passed.  For more information about the eval context, see
+    :ref:`eval-context`.
+
+    .. versionadded:: 2.4
+    """
+    f.evalcontextfunction = True
+    return f
+
+
+def environmentfunction(f):
+    """This decorator can be used to mark a function or method as environment
+    callable.  This decorator works exactly like the :func:`contextfunction`
+    decorator just that the first argument is the active :class:`Environment`
+    and not context.
+    """
+    f.environmentfunction = True
+    return f
+
+
+def internalcode(f):
+    """Marks the function as internally used"""
+    internal_code.add(f.__code__)
+    return f
+
+
+def is_undefined(obj):
+    """Check if the object passed is undefined.  This does nothing more than
+    performing an instance check against :class:`Undefined` but looks nicer.
+    This can be used for custom filters or tests that want to react to
+    undefined variables.  For example a custom default filter can look like
+    this::
+
+        def default(var, default=''):
+            if is_undefined(var):
+                return default
+            return var
+    """
+    from .runtime import Undefined
+
+    return isinstance(obj, Undefined)
+
+
+def consume(iterable):
+    """Consumes an iterable without doing anything with it."""
+    for _ in iterable:
+        pass
+
+
+def clear_caches():
+    """Jinja keeps internal caches for environments and lexers.  These are
+    used so that Jinja doesn't have to recreate environments and lexers all
+    the time.  Normally you don't have to care about that but if you are
+    measuring memory consumption you may want to clean the caches.
+    """
+    from .environment import _spontaneous_environments
+    from .lexer import _lexer_cache
+
+    _spontaneous_environments.clear()
+    _lexer_cache.clear()
+
+
+def import_string(import_name, silent=False):
+    """Imports an object based on a string.  This is useful if you want to
+    use import paths as endpoints or something similar.  An import path can
+    be specified either in dotted notation (``xml.sax.saxutils.escape``)
+    or with a colon as object delimiter (``xml.sax.saxutils:escape``).
+
+    If the `silent` is True the return value will be `None` if the import
+    fails.
+
+    :return: imported object
+    """
+    try:
+        if ":" in import_name:
+            module, obj = import_name.split(":", 1)
+        elif "." in import_name:
+            module, _, obj = import_name.rpartition(".")
+        else:
+            return __import__(import_name)
+        return getattr(__import__(module, None, None, [obj]), obj)
+    except (ImportError, AttributeError):
+        if not silent:
+            raise
+
+
+def open_if_exists(filename, mode="rb"):
+    """Returns a file descriptor for the filename if that file exists,
+    otherwise ``None``.
+    """
+    if not os.path.isfile(filename):
+        return None
+
+    return open(filename, mode)
+
+
+def object_type_repr(obj):
+    """Returns the name of the object's type.  For some recognized
+    singletons the name of the object is returned instead. (For
+    example for `None` and `Ellipsis`).
+    """
+    if obj is None:
+        return "None"
+    elif obj is Ellipsis:
+        return "Ellipsis"
+
+    cls = type(obj)
+
+    # __builtin__ in 2.x, builtins in 3.x
+    if cls.__module__ in ("__builtin__", "builtins"):
+        name = cls.__name__
+    else:
+        name = cls.__module__ + "." + cls.__name__
+
+    return "%s object" % name
+
+
+def pformat(obj, verbose=False):
+    """Prettyprint an object.  Either use the `pretty` library or the
+    builtin `pprint`.
+    """
+    try:
+        from pretty import pretty
+
+        return pretty(obj, verbose=verbose)
+    except ImportError:
+        from pprint import pformat
+
+        return pformat(obj)
+
+
+def urlize(text, trim_url_limit=None, rel=None, target=None):
+    """Converts any URLs in text into clickable links. Works on http://,
+    https:// and www. links. Links can have trailing punctuation (periods,
+    commas, close-parens) and leading punctuation (opening parens) and
+    it'll still do the right thing.
+
+    If trim_url_limit is not None, the URLs in link text will be limited
+    to trim_url_limit characters.
+
+    If nofollow is True, the URLs in link text will get a rel="nofollow"
+    attribute.
+
+    If target is not None, a target attribute will be added to the link.
+    """
+    trim_url = (
+        lambda x, limit=trim_url_limit: limit is not None
+        and (x[:limit] + (len(x) >= limit and "..." or ""))
+        or x
+    )
+    words = _word_split_re.split(text_type(escape(text)))
+    rel_attr = rel and ' rel="%s"' % text_type(escape(rel)) or ""
+    target_attr = target and ' target="%s"' % escape(target) or ""
+
+    for i, word in enumerate(words):
+        match = _punctuation_re.match(word)
+        if match:
+            lead, middle, trail = match.groups()
+            if middle.startswith("www.") or (
+                "@" not in middle
+                and not middle.startswith("http://")
+                and not middle.startswith("https://")
+                and len(middle) > 0
+                and middle[0] in _letters + _digits
+                and (
+                    middle.endswith(".org")
+                    or middle.endswith(".net")
+                    or middle.endswith(".com")
+                )
+            ):
+                middle = '<a href="http://%s"%s%s>%s</a>' % (
+                    middle,
+                    rel_attr,
+                    target_attr,
+                    trim_url(middle),
+                )
+            if middle.startswith("http://") or middle.startswith("https://"):
+                middle = '<a href="%s"%s%s>%s</a>' % (
+                    middle,
+                    rel_attr,
+                    target_attr,
+                    trim_url(middle),
+                )
+            if (
+                "@" in middle
+                and not middle.startswith("www.")
+                and ":" not in middle
+                and _simple_email_re.match(middle)
+            ):
+                middle = '<a href="mailto:%s">%s</a>' % (middle, middle)
+            if lead + middle + trail != word:
+                words[i] = lead + middle + trail
+    return u"".join(words)
+
+
+def generate_lorem_ipsum(n=5, html=True, min=20, max=100):
+    """Generate some lorem ipsum for the template."""
+    from .constants import LOREM_IPSUM_WORDS
+
+    words = LOREM_IPSUM_WORDS.split()
+    result = []
+
+    for _ in range(n):
+        next_capitalized = True
+        last_comma = last_fullstop = 0
+        word = None
+        last = None
+        p = []
+
+        # each paragraph contains out of 20 to 100 words.
+        for idx, _ in enumerate(range(randrange(min, max))):
+            while True:
+                word = choice(words)
+                if word != last:
+                    last = word
+                    break
+            if next_capitalized:
+                word = word.capitalize()
+                next_capitalized = False
+            # add commas
+            if idx - randrange(3, 8) > last_comma:
+                last_comma = idx
+                last_fullstop += 2
+                word += ","
+            # add end of sentences
+            if idx - randrange(10, 20) > last_fullstop:
+                last_comma = last_fullstop = idx
+                word += "."
+                next_capitalized = True
+            p.append(word)
+
+        # ensure that the paragraph ends with a dot.
+        p = u" ".join(p)
+        if p.endswith(","):
+            p = p[:-1] + "."
+        elif not p.endswith("."):
+            p += "."
+        result.append(p)
+
+    if not html:
+        return u"\n\n".join(result)
+    return Markup(u"\n".join(u"<p>%s</p>" % escape(x) for x in result))
+
+
+def unicode_urlencode(obj, charset="utf-8", for_qs=False):
+    """Quote a string for use in a URL using the given charset.
+
+    This function is misnamed, it is a wrapper around
+    :func:`urllib.parse.quote`.
+
+    :param obj: String or bytes to quote. Other types are converted to
+        string then encoded to bytes using the given charset.
+    :param charset: Encode text to bytes using this charset.
+    :param for_qs: Quote "/" and use "+" for spaces.
+    """
+    if not isinstance(obj, string_types):
+        obj = text_type(obj)
+
+    if isinstance(obj, text_type):
+        obj = obj.encode(charset)
+
+    safe = b"" if for_qs else b"/"
+    rv = url_quote(obj, safe)
+
+    if not isinstance(rv, text_type):
+        rv = rv.decode("utf-8")
+
+    if for_qs:
+        rv = rv.replace("%20", "+")
+
+    return rv
+
+
+class LRUCache(object):
+    """A simple LRU Cache implementation."""
+
+    # this is fast for small capacities (something below 1000) but doesn't
+    # scale.  But as long as it's only used as storage for templates this
+    # won't do any harm.
+
+    def __init__(self, capacity):
+        self.capacity = capacity
+        self._mapping = {}
+        self._queue = deque()
+        self._postinit()
+
+    def _postinit(self):
+        # alias all queue methods for faster lookup
+        self._popleft = self._queue.popleft
+        self._pop = self._queue.pop
+        self._remove = self._queue.remove
+        self._wlock = Lock()
+        self._append = self._queue.append
+
+    def __getstate__(self):
+        return {
+            "capacity": self.capacity,
+            "_mapping": self._mapping,
+            "_queue": self._queue,
+        }
+
+    def __setstate__(self, d):
+        self.__dict__.update(d)
+        self._postinit()
+
+    def __getnewargs__(self):
+        return (self.capacity,)
+
+    def copy(self):
+        """Return a shallow copy of the instance."""
+        rv = self.__class__(self.capacity)
+        rv._mapping.update(self._mapping)
+        rv._queue.extend(self._queue)
+        return rv
+
+    def get(self, key, default=None):
+        """Return an item from the cache dict or `default`"""
+        try:
+            return self[key]
+        except KeyError:
+            return default
+
+    def setdefault(self, key, default=None):
+        """Set `default` if the key is not in the cache otherwise
+        leave unchanged. Return the value of this key.
+        """
+        try:
+            return self[key]
+        except KeyError:
+            self[key] = default
+            return default
+
+    def clear(self):
+        """Clear the cache."""
+        self._wlock.acquire()
+        try:
+            self._mapping.clear()
+            self._queue.clear()
+        finally:
+            self._wlock.release()
+
+    def __contains__(self, key):
+        """Check if a key exists in this cache."""
+        return key in self._mapping
+
+    def __len__(self):
+        """Return the current size of the cache."""
+        return len(self._mapping)
+
+    def __repr__(self):
+        return "<%s %r>" % (self.__class__.__name__, self._mapping)
+
+    def __getitem__(self, key):
+        """Get an item from the cache. Moves the item up so that it has the
+        highest priority then.
+
+        Raise a `KeyError` if it does not exist.
+        """
+        self._wlock.acquire()
+        try:
+            rv = self._mapping[key]
+            if self._queue[-1] != key:
+                try:
+                    self._remove(key)
+                except ValueError:
+                    # if something removed the key from the container
+                    # when we read, ignore the ValueError that we would
+                    # get otherwise.
+                    pass
+                self._append(key)
+            return rv
+        finally:
+            self._wlock.release()
+
+    def __setitem__(self, key, value):
+        """Sets the value for an item. Moves the item up so that it
+        has the highest priority then.
+        """
+        self._wlock.acquire()
+        try:
+            if key in self._mapping:
+                self._remove(key)
+            elif len(self._mapping) == self.capacity:
+                del self._mapping[self._popleft()]
+            self._append(key)
+            self._mapping[key] = value
+        finally:
+            self._wlock.release()
+
+    def __delitem__(self, key):
+        """Remove an item from the cache dict.
+        Raise a `KeyError` if it does not exist.
+        """
+        self._wlock.acquire()
+        try:
+            del self._mapping[key]
+            try:
+                self._remove(key)
+            except ValueError:
+                pass
+        finally:
+            self._wlock.release()
+
+    def items(self):
+        """Return a list of items."""
+        result = [(key, self._mapping[key]) for key in list(self._queue)]
+        result.reverse()
+        return result
+
+    def iteritems(self):
+        """Iterate over all items."""
+        warnings.warn(
+            "'iteritems()' will be removed in version 3.0. Use"
+            " 'iter(cache.items())' instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return iter(self.items())
+
+    def values(self):
+        """Return a list of all values."""
+        return [x[1] for x in self.items()]
+
+    def itervalue(self):
+        """Iterate over all values."""
+        warnings.warn(
+            "'itervalue()' will be removed in version 3.0. Use"
+            " 'iter(cache.values())' instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return iter(self.values())
+
+    def itervalues(self):
+        """Iterate over all values."""
+        warnings.warn(
+            "'itervalues()' will be removed in version 3.0. Use"
+            " 'iter(cache.values())' instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return iter(self.values())
+
+    def keys(self):
+        """Return a list of all keys ordered by most recent usage."""
+        return list(self)
+
+    def iterkeys(self):
+        """Iterate over all keys in the cache dict, ordered by
+        the most recent usage.
+        """
+        warnings.warn(
+            "'iterkeys()' will be removed in version 3.0. Use"
+            " 'iter(cache.keys())' instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return iter(self)
+
+    def __iter__(self):
+        return reversed(tuple(self._queue))
+
+    def __reversed__(self):
+        """Iterate over the keys in the cache dict, oldest items
+        coming first.
+        """
+        return iter(tuple(self._queue))
+
+    __copy__ = copy
+
+
+abc.MutableMapping.register(LRUCache)
+
+
+def select_autoescape(
+    enabled_extensions=("html", "htm", "xml"),
+    disabled_extensions=(),
+    default_for_string=True,
+    default=False,
+):
+    """Intelligently sets the initial value of autoescaping based on the
+    filename of the template.  This is the recommended way to configure
+    autoescaping if you do not want to write a custom function yourself.
+
+    If you want to enable it for all templates created from strings or
+    for all templates with `.html` and `.xml` extensions::
+
+        from jinja2 import Environment, select_autoescape
+        env = Environment(autoescape=select_autoescape(
+            enabled_extensions=('html', 'xml'),
+            default_for_string=True,
+        ))
+
+    Example configuration to turn it on at all times except if the template
+    ends with `.txt`::
+
+        from jinja2 import Environment, select_autoescape
+        env = Environment(autoescape=select_autoescape(
+            disabled_extensions=('txt',),
+            default_for_string=True,
+            default=True,
+        ))
+
+    The `enabled_extensions` is an iterable of all the extensions that
+    autoescaping should be enabled for.  Likewise `disabled_extensions` is
+    a list of all templates it should be disabled for.  If a template is
+    loaded from a string then the default from `default_for_string` is used.
+    If nothing matches then the initial value of autoescaping is set to the
+    value of `default`.
+
+    For security reasons this function operates case insensitive.
+
+    .. versionadded:: 2.9
+    """
+    enabled_patterns = tuple("." + x.lstrip(".").lower() for x in enabled_extensions)
+    disabled_patterns = tuple("." + x.lstrip(".").lower() for x in disabled_extensions)
+
+    def autoescape(template_name):
+        if template_name is None:
+            return default_for_string
+        template_name = template_name.lower()
+        if template_name.endswith(enabled_patterns):
+            return True
+        if template_name.endswith(disabled_patterns):
+            return False
+        return default
+
+    return autoescape
+
+
+def htmlsafe_json_dumps(obj, dumper=None, **kwargs):
+    """Works exactly like :func:`dumps` but is safe for use in ``<script>``
+    tags.  It accepts the same arguments and returns a JSON string.  Note that
+    this is available in templates through the ``|tojson`` filter which will
+    also mark the result as safe.  Due to how this function escapes certain
+    characters this is safe even if used outside of ``<script>`` tags.
+
+    The following characters are escaped in strings:
+
+    -   ``<``
+    -   ``>``
+    -   ``&``
+    -   ``'``
+
+    This makes it safe to embed such strings in any place in HTML with the
+    notable exception of double quoted attributes.  In that case single
+    quote your attributes or HTML escape it in addition.
+    """
+    if dumper is None:
+        dumper = json.dumps
+    rv = (
+        dumper(obj, **kwargs)
+        .replace(u"<", u"\\u003c")
+        .replace(u">", u"\\u003e")
+        .replace(u"&", u"\\u0026")
+        .replace(u"'", u"\\u0027")
+    )
+    return Markup(rv)
+
+
+class Cycler(object):
+    """Cycle through values by yield them one at a time, then restarting
+    once the end is reached. Available as ``cycler`` in templates.
+
+    Similar to ``loop.cycle``, but can be used outside loops or across
+    multiple loops. For example, render a list of folders and files in a
+    list, alternating giving them "odd" and "even" classes.
+
+    .. code-block:: html+jinja
+
+        {% set row_class = cycler("odd", "even") %}
+        <ul class="browser">
+        {% for folder in folders %}
+          <li class="folder {{ row_class.next() }}">{{ folder }}
+        {% endfor %}
+        {% for file in files %}
+          <li class="file {{ row_class.next() }}">{{ file }}
+        {% endfor %}
+        </ul>
+
+    :param items: Each positional argument will be yielded in the order
+        given for each cycle.
+
+    .. versionadded:: 2.1
+    """
+
+    def __init__(self, *items):
+        if not items:
+            raise RuntimeError("at least one item has to be provided")
+        self.items = items
+        self.pos = 0
+
+    def reset(self):
+        """Resets the current item to the first item."""
+        self.pos = 0
+
+    @property
+    def current(self):
+        """Return the current item. Equivalent to the item that will be
+        returned next time :meth:`next` is called.
+        """
+        return self.items[self.pos]
+
+    def next(self):
+        """Return the current item, then advance :attr:`current` to the
+        next item.
+        """
+        rv = self.current
+        self.pos = (self.pos + 1) % len(self.items)
+        return rv
+
+    __next__ = next
+
+
+class Joiner(object):
+    """A joining helper for templates."""
+
+    def __init__(self, sep=u", "):
+        self.sep = sep
+        self.used = False
+
+    def __call__(self):
+        if not self.used:
+            self.used = True
+            return u""
+        return self.sep
+
+
+class Namespace(object):
+    """A namespace object that can hold arbitrary attributes.  It may be
+    initialized from a dictionary or with keyword arguments."""
+
+    def __init__(*args, **kwargs):  # noqa: B902
+        self, args = args[0], args[1:]
+        self.__attrs = dict(*args, **kwargs)
+
+    def __getattribute__(self, name):
+        # __class__ is needed for the awaitable check in async mode
+        if name in {"_Namespace__attrs", "__class__"}:
+            return object.__getattribute__(self, name)
+        try:
+            return self.__attrs[name]
+        except KeyError:
+            raise AttributeError(name)
+
+    def __setitem__(self, name, value):
+        self.__attrs[name] = value
+
+    def __repr__(self):
+        return "<Namespace %r>" % self.__attrs
+
+
+# does this python version support async for in and async generators?
+try:
+    exec("async def _():\n async for _ in ():\n  yield _")
+    have_async_gen = True
+except SyntaxError:
+    have_async_gen = False
+
+
+def soft_unicode(s):
+    from markupsafe import soft_unicode
+
+    warnings.warn(
+        "'jinja2.utils.soft_unicode' will be removed in version 3.0."
+        " Use 'markupsafe.soft_unicode' instead.",
+        DeprecationWarning,
+        stacklevel=2,
+    )
+    return soft_unicode(s)

env/lib/python3.5/site-packages/jinja2/visitor.py

+# -*- coding: utf-8 -*-
+"""API for traversing the AST nodes. Implemented by the compiler and
+meta introspection.
+"""
+from .nodes import Node
+
+
+class NodeVisitor(object):
+    """Walks the abstract syntax tree and call visitor functions for every
+    node found.  The visitor functions may return values which will be
+    forwarded by the `visit` method.
+
+    Per default the visitor functions for the nodes are ``'visit_'`` +
+    class name of the node.  So a `TryFinally` node visit function would
+    be `visit_TryFinally`.  This behavior can be changed by overriding
+    the `get_visitor` function.  If no visitor function exists for a node
+    (return value `None`) the `generic_visit` visitor is used instead.
+    """
+
+    def get_visitor(self, node):
+        """Return the visitor function for this node or `None` if no visitor
+        exists for this node.  In that case the generic visit function is
+        used instead.
+        """
+        method = "visit_" + node.__class__.__name__
+        return getattr(self, method, None)
+
+    def visit(self, node, *args, **kwargs):
+        """Visit a node."""
+        f = self.get_visitor(node)
+        if f is not None:
+            return f(node, *args, **kwargs)
+        return self.generic_visit(node, *args, **kwargs)
+
+    def generic_visit(self, node, *args, **kwargs):
+        """Called if no explicit visitor function exists for a node."""
+        for node in node.iter_child_nodes():
+            self.visit(node, *args, **kwargs)
+
+
+class NodeTransformer(NodeVisitor):
+    """Walks the abstract syntax tree and allows modifications of nodes.
+
+    The `NodeTransformer` will walk the AST and use the return value of the
+    visitor functions to replace or remove the old node.  If the return
+    value of the visitor function is `None` the node will be removed
+    from the previous location otherwise it's replaced with the return
+    value.  The return value may be the original node in which case no
+    replacement takes place.
+    """
+
+    def generic_visit(self, node, *args, **kwargs):
+        for field, old_value in node.iter_fields():
+            if isinstance(old_value, list):
+                new_values = []
+                for value in old_value:
+                    if isinstance(value, Node):
+                        value = self.visit(value, *args, **kwargs)
+                        if value is None:
+                            continue
+                        elif not isinstance(value, Node):
+                            new_values.extend(value)
+                            continue
+                    new_values.append(value)
+                old_value[:] = new_values
+            elif isinstance(old_value, Node):
+                new_node = self.visit(old_value, *args, **kwargs)
+                if new_node is None:
+                    delattr(node, field)
+                else:
+                    setattr(node, field, new_node)
+        return node
+
+    def visit_list(self, node, *args, **kwargs):
+        """As transformers may return lists in some places this method
+        can be used to enforce a list as return value.
+        """
+        rv = self.visit(node, *args, **kwargs)
+        if not isinstance(rv, list):
+            rv = [rv]
+        return rv

env/lib/python3.5/site-packages/markupsafe/__init__.py

+# -*- coding: utf-8 -*-
+"""
+markupsafe
+~~~~~~~~~~
+
+Implements an escape function and a Markup string to replace HTML
+special characters with safe representations.
+
+:copyright: 2010 Pallets
+:license: BSD-3-Clause
+"""
+import re
+import string
+
+from ._compat import int_types
+from ._compat import iteritems
+from ._compat import Mapping
+from ._compat import PY2
+from ._compat import string_types
+from ._compat import text_type
+from ._compat import unichr
+
+__version__ = "1.1.1"
+
+__all__ = ["Markup", "soft_unicode", "escape", "escape_silent"]
+
+_striptags_re = re.compile(r"(<!--.*?-->|<[^>]*>)")
+_entity_re = re.compile(r"&([^& ;]+);")
+
+
+class Markup(text_type):
+    """A string that is ready to be safely inserted into an HTML or XML
+    document, either because it was escaped or because it was marked
+    safe.
+
+    Passing an object to the constructor converts it to text and wraps
+    it to mark it safe without escaping. To escape the text, use the
+    :meth:`escape` class method instead.
+
+    >>> Markup('Hello, <em>World</em>!')
+    Markup('Hello, <em>World</em>!')
+    >>> Markup(42)
+    Markup('42')
+    >>> Markup.escape('Hello, <em>World</em>!')
+    Markup('Hello &lt;em&gt;World&lt;/em&gt;!')
+
+    This implements the ``__html__()`` interface that some frameworks
+    use. Passing an object that implements ``__html__()`` will wrap the
+    output of that method, marking it safe.
+
+    >>> class Foo:
+    ...     def __html__(self):
+    ...         return '<a href="/foo">foo</a>'
+    ...
+    >>> Markup(Foo())
+    Markup('<a href="/foo">foo</a>')
+
+    This is a subclass of the text type (``str`` in Python 3,
+    ``unicode`` in Python 2). It has the same methods as that type, but
+    all methods escape their arguments and return a ``Markup`` instance.
+
+    >>> Markup('<em>%s</em>') % 'foo & bar'
+    Markup('<em>foo &amp; bar</em>')
+    >>> Markup('<em>Hello</em> ') + '<foo>'
+    Markup('<em>Hello</em> &lt;foo&gt;')
+    """
+
+    __slots__ = ()
+
+    def __new__(cls, base=u"", encoding=None, errors="strict"):
+        if hasattr(base, "__html__"):
+            base = base.__html__()
+        if encoding is None:
+            return text_type.__new__(cls, base)
+        return text_type.__new__(cls, base, encoding, errors)
+
+    def __html__(self):
+        return self
+
+    def __add__(self, other):
+        if isinstance(other, string_types) or hasattr(other, "__html__"):
+            return self.__class__(super(Markup, self).__add__(self.escape(other)))
+        return NotImplemented
+
+    def __radd__(self, other):
+        if hasattr(other, "__html__") or isinstance(other, string_types):
+            return self.escape(other).__add__(self)
+        return NotImplemented
+
+    def __mul__(self, num):
+        if isinstance(num, int_types):
+            return self.__class__(text_type.__mul__(self, num))
+        return NotImplemented
+
+    __rmul__ = __mul__
+
+    def __mod__(self, arg):
+        if isinstance(arg, tuple):
+            arg = tuple(_MarkupEscapeHelper(x, self.escape) for x in arg)
+        else:
+            arg = _MarkupEscapeHelper(arg, self.escape)
+        return self.__class__(text_type.__mod__(self, arg))
+
+    def __repr__(self):
+        return "%s(%s)" % (self.__class__.__name__, text_type.__repr__(self))
+
+    def join(self, seq):
+        return self.__class__(text_type.join(self, map(self.escape, seq)))
+
+    join.__doc__ = text_type.join.__doc__
+
+    def split(self, *args, **kwargs):
+        return list(map(self.__class__, text_type.split(self, *args, **kwargs)))
+
+    split.__doc__ = text_type.split.__doc__
+
+    def rsplit(self, *args, **kwargs):
+        return list(map(self.__class__, text_type.rsplit(self, *args, **kwargs)))
+
+    rsplit.__doc__ = text_type.rsplit.__doc__
+
+    def splitlines(self, *args, **kwargs):
+        return list(map(self.__class__, text_type.splitlines(self, *args, **kwargs)))
+
+    splitlines.__doc__ = text_type.splitlines.__doc__
+
+    def unescape(self):
+        """Convert escaped markup back into a text string. This replaces
+        HTML entities with the characters they represent.
+
+        >>> Markup('Main &raquo; <em>About</em>').unescape()
+        'Main » <em>About</em>'
+        """
+        from ._constants import HTML_ENTITIES
+
+        def handle_match(m):
+            name = m.group(1)
+            if name in HTML_ENTITIES:
+                return unichr(HTML_ENTITIES[name])
+            try:
+                if name[:2] in ("#x", "#X"):
+                    return unichr(int(name[2:], 16))
+                elif name.startswith("#"):
+                    return unichr(int(name[1:]))
+            except ValueError:
+                pass
+            # Don't modify unexpected input.
+            return m.group()
+
+        return _entity_re.sub(handle_match, text_type(self))
+
+    def striptags(self):
+        """:meth:`unescape` the markup, remove tags, and normalize
+        whitespace to single spaces.
+
+        >>> Markup('Main &raquo;\t<em>About</em>').striptags()
+        'Main » About'
+        """
+        stripped = u" ".join(_striptags_re.sub("", self).split())
+        return Markup(stripped).unescape()
+
+    @classmethod
+    def escape(cls, s):
+        """Escape a string. Calls :func:`escape` and ensures that for
+        subclasses the correct type is returned.
+        """
+        rv = escape(s)
+        if rv.__class__ is not cls:
+            return cls(rv)
+        return rv
+
+    def make_simple_escaping_wrapper(name):  # noqa: B902
+        orig = getattr(text_type, name)
+
+        def func(self, *args, **kwargs):
+            args = _escape_argspec(list(args), enumerate(args), self.escape)
+            _escape_argspec(kwargs, iteritems(kwargs), self.escape)
+            return self.__class__(orig(self, *args, **kwargs))
+
+        func.__name__ = orig.__name__
+        func.__doc__ = orig.__doc__
+        return func
+
+    for method in (
+        "__getitem__",
+        "capitalize",
+        "title",
+        "lower",
+        "upper",
+        "replace",
+        "ljust",
+        "rjust",
+        "lstrip",
+        "rstrip",
+        "center",
+        "strip",
+        "translate",
+        "expandtabs",
+        "swapcase",
+        "zfill",
+    ):
+        locals()[method] = make_simple_escaping_wrapper(method)
+
+    def partition(self, sep):
+        return tuple(map(self.__class__, text_type.partition(self, self.escape(sep))))
+
+    def rpartition(self, sep):
+        return tuple(map(self.__class__, text_type.rpartition(self, self.escape(sep))))
+
+    def format(self, *args, **kwargs):
+        formatter = EscapeFormatter(self.escape)
+        kwargs = _MagicFormatMapping(args, kwargs)
+        return self.__class__(formatter.vformat(self, args, kwargs))
+
+    def __html_format__(self, format_spec):
+        if format_spec:
+            raise ValueError("Unsupported format specification " "for Markup.")
+        return self
+
+    # not in python 3
+    if hasattr(text_type, "__getslice__"):
+        __getslice__ = make_simple_escaping_wrapper("__getslice__")
+
+    del method, make_simple_escaping_wrapper
+
+
+class _MagicFormatMapping(Mapping):
+    """This class implements a dummy wrapper to fix a bug in the Python
+    standard library for string formatting.
+
+    See http://bugs.python.org/issue13598 for information about why
+    this is necessary.
+    """
+
+    def __init__(self, args, kwargs):
+        self._args = args
+        self._kwargs = kwargs
+        self._last_index = 0
+
+    def __getitem__(self, key):
+        if key == "":
+            idx = self._last_index
+            self._last_index += 1
+            try:
+                return self._args[idx]
+            except LookupError:
+                pass
+            key = str(idx)
+        return self._kwargs[key]
+
+    def __iter__(self):
+        return iter(self._kwargs)
+
+    def __len__(self):
+        return len(self._kwargs)
+
+
+if hasattr(text_type, "format"):
+
+    class EscapeFormatter(string.Formatter):
+        def __init__(self, escape):
+            self.escape = escape
+
+        def format_field(self, value, format_spec):
+            if hasattr(value, "__html_format__"):
+                rv = value.__html_format__(format_spec)
+            elif hasattr(value, "__html__"):
+                if format_spec:
+                    raise ValueError(
+                        "Format specifier {0} given, but {1} does not"
+                        " define __html_format__. A class that defines"
+                        " __html__ must define __html_format__ to work"
+                        " with format specifiers.".format(format_spec, type(value))
+                    )
+                rv = value.__html__()
+            else:
+                # We need to make sure the format spec is unicode here as
+                # otherwise the wrong callback methods are invoked.  For
+                # instance a byte string there would invoke __str__ and
+                # not __unicode__.
+                rv = string.Formatter.format_field(self, value, text_type(format_spec))
+            return text_type(self.escape(rv))
+
+
+def _escape_argspec(obj, iterable, escape):
+    """Helper for various string-wrapped functions."""
+    for key, value in iterable:
+        if hasattr(value, "__html__") or isinstance(value, string_types):
+            obj[key] = escape(value)
+    return obj
+
+
+class _MarkupEscapeHelper(object):
+    """Helper for Markup.__mod__"""
+
+    def __init__(self, obj, escape):
+        self.obj = obj
+        self.escape = escape
+
+    def __getitem__(self, item):
+        return _MarkupEscapeHelper(self.obj[item], self.escape)
+
+    def __str__(self):
+        return text_type(self.escape(self.obj))
+
+    __unicode__ = __str__
+
+    def __repr__(self):
+        return str(self.escape(repr(self.obj)))
+
+    def __int__(self):
+        return int(self.obj)
+
+    def __float__(self):
+        return float(self.obj)
+
+
+# we have to import it down here as the speedups and native
+# modules imports the markup type which is define above.
+try:
+    from ._speedups import escape, escape_silent, soft_unicode
+except ImportError:
+    from ._native import escape, escape_silent, soft_unicode
+
+if not PY2:
+    soft_str = soft_unicode
+    __all__.append("soft_str")

env/lib/python3.5/site-packages/markupsafe/_compat.py

+# -*- coding: utf-8 -*-
+"""
+markupsafe._compat
+~~~~~~~~~~~~~~~~~~
+
+:copyright: 2010 Pallets
+:license: BSD-3-Clause
+"""
+import sys
+
+PY2 = sys.version_info[0] == 2
+
+if not PY2:
+    text_type = str
+    string_types = (str,)
+    unichr = chr
+    int_types = (int,)
+
+    def iteritems(x):
+        return iter(x.items())
+
+    from collections.abc import Mapping
+
+else:
+    text_type = unicode
+    string_types = (str, unicode)
+    unichr = unichr
+    int_types = (int, long)
+
+    def iteritems(x):
+        return x.iteritems()
+
+    from collections import Mapping

env/lib/python3.5/site-packages/markupsafe/_constants.py

+# -*- coding: utf-8 -*-
+"""
+markupsafe._constants
+~~~~~~~~~~~~~~~~~~~~~
+
+:copyright: 2010 Pallets
+:license: BSD-3-Clause
+"""
+
+HTML_ENTITIES = {
+    "AElig": 198,
+    "Aacute": 193,
+    "Acirc": 194,
+    "Agrave": 192,
+    "Alpha": 913,
+    "Aring": 197,
+    "Atilde": 195,
+    "Auml": 196,
+    "Beta": 914,
+    "Ccedil": 199,
+    "Chi": 935,
+    "Dagger": 8225,
+    "Delta": 916,
+    "ETH": 208,
+    "Eacute": 201,
+    "Ecirc": 202,
+    "Egrave": 200,
+    "Epsilon": 917,
+    "Eta": 919,
+    "Euml": 203,
+    "Gamma": 915,
+    "Iacute": 205,
+    "Icirc": 206,
+    "Igrave": 204,
+    "Iota": 921,
+    "Iuml": 207,
+    "Kappa": 922,
+    "Lambda": 923,
+    "Mu": 924,
+    "Ntilde": 209,
+    "Nu": 925,
+    "OElig": 338,
+    "Oacute": 211,
+    "Ocirc": 212,
+    "Ograve": 210,
+    "Omega": 937,
+    "Omicron": 927,
+    "Oslash": 216,
+    "Otilde": 213,
+    "Ouml": 214,
+    "Phi": 934,
+    "Pi": 928,
+    "Prime": 8243,
+    "Psi": 936,
+    "Rho": 929,
+    "Scaron": 352,
+    "Sigma": 931,
+    "THORN": 222,
+    "Tau": 932,
+    "Theta": 920,
+    "Uacute": 218,
+    "Ucirc": 219,
+    "Ugrave": 217,
+    "Upsilon": 933,
+    "Uuml": 220,
+    "Xi": 926,
+    "Yacute": 221,
+    "Yuml": 376,
+    "Zeta": 918,
+    "aacute": 225,
+    "acirc": 226,
+    "acute": 180,
+    "aelig": 230,
+    "agrave": 224,
+    "alefsym": 8501,
+    "alpha": 945,
+    "amp": 38,
+    "and": 8743,
+    "ang": 8736,
+    "apos": 39,
+    "aring": 229,
+    "asymp": 8776,
+    "atilde": 227,
+    "auml": 228,
+    "bdquo": 8222,
+    "beta": 946,
+    "brvbar": 166,
+    "bull": 8226,
+    "cap": 8745,
+    "ccedil": 231,
+    "cedil": 184,
+    "cent": 162,
+    "chi": 967,
+    "circ": 710,
+    "clubs": 9827,
+    "cong": 8773,
+    "copy": 169,
+    "crarr": 8629,
+    "cup": 8746,
+    "curren": 164,
+    "dArr": 8659,
+    "dagger": 8224,
+    "darr": 8595,
+    "deg": 176,
+    "delta": 948,
+    "diams": 9830,
+    "divide": 247,
+    "eacute": 233,
+    "ecirc": 234,
+    "egrave": 232,
+    "empty": 8709,
+    "emsp": 8195,
+    "ensp": 8194,
+    "epsilon": 949,
+    "equiv": 8801,
+    "eta": 951,
+    "eth": 240,
+    "euml": 235,
+    "euro": 8364,
+    "exist": 8707,
+    "fnof": 402,
+    "forall": 8704,
+    "frac12": 189,
+    "frac14": 188,
+    "frac34": 190,
+    "frasl": 8260,
+    "gamma": 947,
+    "ge": 8805,
+    "gt": 62,
+    "hArr": 8660,
+    "harr": 8596,
+    "hearts": 9829,
+    "hellip": 8230,
+    "iacute": 237,
+    "icirc": 238,
+    "iexcl": 161,
+    "igrave": 236,
+    "image": 8465,
+    "infin": 8734,
+    "int": 8747,
+    "iota": 953,
+    "iquest": 191,
+    "isin": 8712,
+    "iuml": 239,
+    "kappa": 954,
+    "lArr": 8656,
+    "lambda": 955,
+    "lang": 9001,
+    "laquo": 171,
+    "larr": 8592,
+    "lceil": 8968,
+    "ldquo": 8220,
+    "le": 8804,
+    "lfloor": 8970,
+    "lowast": 8727,
+    "loz": 9674,
+    "lrm": 8206,
+    "lsaquo": 8249,
+    "lsquo": 8216,
+    "lt": 60,
+    "macr": 175,
+    "mdash": 8212,
+    "micro": 181,
+    "middot": 183,
+    "minus": 8722,
+    "mu": 956,
+    "nabla": 8711,
+    "nbsp": 160,
+    "ndash": 8211,
+    "ne": 8800,
+    "ni": 8715,
+    "not": 172,
+    "notin": 8713,
+    "nsub": 8836,
+    "ntilde": 241,
+    "nu": 957,
+    "oacute": 243,
+    "ocirc": 244,
+    "oelig": 339,
+    "ograve": 242,
+    "oline": 8254,
+    "omega": 969,
+    "omicron": 959,
+    "oplus": 8853,
+    "or": 8744,
+    "ordf": 170,
+    "ordm": 186,
+    "oslash": 248,
+    "otilde": 245,
+    "otimes": 8855,
+    "ouml": 246,
+    "para": 182,
+    "part": 8706,
+    "permil": 8240,
+    "perp": 8869,
+    "phi": 966,
+    "pi": 960,
+    "piv": 982,
+    "plusmn": 177,
+    "pound": 163,
+    "prime": 8242,
+    "prod": 8719,
+    "prop": 8733,
+    "psi": 968,
+    "quot": 34,
+    "rArr": 8658,
+    "radic": 8730,
+    "rang": 9002,
+    "raquo": 187,
+    "rarr": 8594,
+    "rceil": 8969,
+    "rdquo": 8221,
+    "real": 8476,
+    "reg": 174,
+    "rfloor": 8971,
+    "rho": 961,
+    "rlm": 8207,
+    "rsaquo": 8250,
+    "rsquo": 8217,
+    "sbquo": 8218,
+    "scaron": 353,
+    "sdot": 8901,
+    "sect": 167,
+    "shy": 173,
+    "sigma": 963,
+    "sigmaf": 962,
+    "sim": 8764,
+    "spades": 9824,
+    "sub": 8834,
+    "sube": 8838,
+    "sum": 8721,
+    "sup": 8835,
+    "sup1": 185,
+    "sup2": 178,
+    "sup3": 179,
+    "supe": 8839,
+    "szlig": 223,
+    "tau": 964,
+    "there4": 8756,
+    "theta": 952,
+    "thetasym": 977,
+    "thinsp": 8201,
+    "thorn": 254,
+    "tilde": 732,
+    "times": 215,
+    "trade": 8482,
+    "uArr": 8657,
+    "uacute": 250,
+    "uarr": 8593,
+    "ucirc": 251,
+    "ugrave": 249,
+    "uml": 168,
+    "upsih": 978,
+    "upsilon": 965,
+    "uuml": 252,
+    "weierp": 8472,
+    "xi": 958,
+    "yacute": 253,
+    "yen": 165,
+    "yuml": 255,
+    "zeta": 950,
+    "zwj": 8205,
+    "zwnj": 8204,
+}

env/lib/python3.5/site-packages/markupsafe/_native.py

+# -*- coding: utf-8 -*-
+"""
+markupsafe._native
+~~~~~~~~~~~~~~~~~~
+
+Native Python implementation used when the C module is not compiled.
+
+:copyright: 2010 Pallets
+:license: BSD-3-Clause
+"""
+from . import Markup
+from ._compat import text_type
+
+
+def escape(s):
+    """Replace the characters ``&``, ``<``, ``>``, ``'``, and ``"`` in
+    the string with HTML-safe sequences. Use this if you need to display
+    text that might contain such characters in HTML.
+
+    If the object has an ``__html__`` method, it is called and the
+    return value is assumed to already be safe for HTML.
+
+    :param s: An object to be converted to a string and escaped.
+    :return: A :class:`Markup` string with the escaped text.
+    """
+    if hasattr(s, "__html__"):
+        return Markup(s.__html__())
+    return Markup(
+        text_type(s)
+        .replace("&", "&amp;")
+        .replace(">", "&gt;")
+        .replace("<", "&lt;")
+        .replace("'", "&#39;")
+        .replace('"', "&#34;")
+    )
+
+
+def escape_silent(s):
+    """Like :func:`escape` but treats ``None`` as the empty string.
+    Useful with optional values, as otherwise you get the string
+    ``'None'`` when the value is ``None``.
+
+    >>> escape(None)
+    Markup('None')
+    >>> escape_silent(None)
+    Markup('')
+    """
+    if s is None:
+        return Markup()
+    return escape(s)
+
+
+def soft_unicode(s):
+    """Convert an object to a string if it isn't already. This preserves
+    a :class:`Markup` string rather than converting it back to a basic
+    string, so it will still be marked as safe and won't be escaped
+    again.
+
+    >>> value = escape('<User 1>')
+    >>> value
+    Markup('&lt;User 1&gt;')
+    >>> escape(str(value))
+    Markup('&amp;lt;User 1&amp;gt;')
+    >>> escape(soft_unicode(value))
+    Markup('&lt;User 1&gt;')
+    """
+    if not isinstance(s, text_type):
+        s = text_type(s)
+    return s

env/lib/python3.5/site-packages/markupsafe/_speedups.c

+/**
+ * markupsafe._speedups
+ * ~~~~~~~~~~~~~~~~~~~~
+ *
+ * C implementation of escaping for better performance. Used instead of
+ * the native Python implementation when compiled.
+ *
+ * :copyright: 2010 Pallets
+ * :license: BSD-3-Clause
+ */
+#include <Python.h>
+
+#if PY_MAJOR_VERSION < 3
+#define ESCAPED_CHARS_TABLE_SIZE 63
+#define UNICHR(x) (PyUnicode_AS_UNICODE((PyUnicodeObject*)PyUnicode_DecodeASCII(x, strlen(x), NULL)));
+
+static Py_ssize_t escaped_chars_delta_len[ESCAPED_CHARS_TABLE_SIZE];
+static Py_UNICODE *escaped_chars_repl[ESCAPED_CHARS_TABLE_SIZE];
+#endif
+
+static PyObject* markup;
+
+static int
+init_constants(void)
+{
+	PyObject *module;
+
+#if PY_MAJOR_VERSION < 3
+	/* mapping of characters to replace */
+	escaped_chars_repl['"'] = UNICHR("&#34;");
+	escaped_chars_repl['\''] = UNICHR("&#39;");
+	escaped_chars_repl['&'] = UNICHR("&amp;");
+	escaped_chars_repl['<'] = UNICHR("&lt;");
+	escaped_chars_repl['>'] = UNICHR("&gt;");
+
+	/* lengths of those characters when replaced - 1 */
+	memset(escaped_chars_delta_len, 0, sizeof (escaped_chars_delta_len));
+	escaped_chars_delta_len['"'] = escaped_chars_delta_len['\''] = \
+		escaped_chars_delta_len['&'] = 4;
+	escaped_chars_delta_len['<'] = escaped_chars_delta_len['>'] = 3;
+#endif
+
+	/* import markup type so that we can mark the return value */
+	module = PyImport_ImportModule("markupsafe");
+	if (!module)
+		return 0;
+	markup = PyObject_GetAttrString(module, "Markup");
+	Py_DECREF(module);
+
+	return 1;
+}
+
+#if PY_MAJOR_VERSION < 3
+static PyObject*
+escape_unicode(PyUnicodeObject *in)
+{
+	PyUnicodeObject *out;
+	Py_UNICODE *inp = PyUnicode_AS_UNICODE(in);
+	const Py_UNICODE *inp_end = PyUnicode_AS_UNICODE(in) + PyUnicode_GET_SIZE(in);
+	Py_UNICODE *next_escp;
+	Py_UNICODE *outp;
+	Py_ssize_t delta=0, erepl=0, delta_len=0;
+
+	/* First we need to figure out how long the escaped string will be */
+	while (*(inp) || inp < inp_end) {
+		if (*inp < ESCAPED_CHARS_TABLE_SIZE) {
+			delta += escaped_chars_delta_len[*inp];
+			erepl += !!escaped_chars_delta_len[*inp];
+		}
+		++inp;
+	}
+
+	/* Do we need to escape anything at all? */
+	if (!erepl) {
+		Py_INCREF(in);
+		return (PyObject*)in;
+	}
+
+	out = (PyUnicodeObject*)PyUnicode_FromUnicode(NULL, PyUnicode_GET_SIZE(in) + delta);
+	if (!out)
+		return NULL;
+
+	outp = PyUnicode_AS_UNICODE(out);
+	inp = PyUnicode_AS_UNICODE(in);
+	while (erepl-- > 0) {
+		/* look for the next substitution */
+		next_escp = inp;
+		while (next_escp < inp_end) {
+			if (*next_escp < ESCAPED_CHARS_TABLE_SIZE &&
+			    (delta_len = escaped_chars_delta_len[*next_escp])) {
+				++delta_len;
+				break;
+			}
+			++next_escp;
+		}
+
+		if (next_escp > inp) {
+			/* copy unescaped chars between inp and next_escp */
+			Py_UNICODE_COPY(outp, inp, next_escp-inp);
+			outp += next_escp - inp;
+		}
+
+		/* escape 'next_escp' */
+		Py_UNICODE_COPY(outp, escaped_chars_repl[*next_escp], delta_len);
+		outp += delta_len;
+
+		inp = next_escp + 1;
+	}
+	if (inp < inp_end)
+		Py_UNICODE_COPY(outp, inp, PyUnicode_GET_SIZE(in) - (inp - PyUnicode_AS_UNICODE(in)));
+
+	return (PyObject*)out;
+}
+#else /* PY_MAJOR_VERSION < 3 */
+
+#define GET_DELTA(inp, inp_end, delta) \
+	while (inp < inp_end) {	 \
+		switch (*inp++) {	   \
+		case '"':			   \
+		case '\'':			  \
+		case '&':			   \
+			delta += 4;		 \
+			break;			  \
+		case '<':			   \
+		case '>':			   \
+			delta += 3;		 \
+			break;			  \
+		}					   \
+	}
+
+#define DO_ESCAPE(inp, inp_end, outp) \
+	{  \
+		Py_ssize_t ncopy = 0;  \
+		while (inp < inp_end) {  \
+			switch (*inp) {  \
+			case '"':  \
+				memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
+				outp += ncopy; ncopy = 0; \
+				*outp++ = '&';  \
+				*outp++ = '#';  \
+				*outp++ = '3';  \
+				*outp++ = '4';  \
+				*outp++ = ';';  \
+				break;  \
+			case '\'':  \
+				memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
+				outp += ncopy; ncopy = 0; \
+				*outp++ = '&';  \
+				*outp++ = '#';  \
+				*outp++ = '3';  \
+				*outp++ = '9';  \
+				*outp++ = ';';  \
+				break;  \
+			case '&':  \
+				memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
+				outp += ncopy; ncopy = 0; \
+				*outp++ = '&';  \
+				*outp++ = 'a';  \
+				*outp++ = 'm';  \
+				*outp++ = 'p';  \
+				*outp++ = ';';  \
+				break;  \
+			case '<':  \
+				memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
+				outp += ncopy; ncopy = 0; \
+				*outp++ = '&';  \
+				*outp++ = 'l';  \
+				*outp++ = 't';  \
+				*outp++ = ';';  \
+				break;  \
+			case '>':  \
+				memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
+				outp += ncopy; ncopy = 0; \
+				*outp++ = '&';  \
+				*outp++ = 'g';  \
+				*outp++ = 't';  \
+				*outp++ = ';';  \
+				break;  \
+			default:  \
+				ncopy++; \
+			}  \
+            inp++; \
+		}  \
+		memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
+	}
+
+static PyObject*
+escape_unicode_kind1(PyUnicodeObject *in)
+{
+	Py_UCS1 *inp = PyUnicode_1BYTE_DATA(in);
+	Py_UCS1 *inp_end = inp + PyUnicode_GET_LENGTH(in);
+	Py_UCS1 *outp;
+	PyObject *out;
+	Py_ssize_t delta = 0;
+
+	GET_DELTA(inp, inp_end, delta);
+	if (!delta) {
+		Py_INCREF(in);
+		return (PyObject*)in;
+	}
+
+	out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta,
+						PyUnicode_IS_ASCII(in) ? 127 : 255);
+	if (!out)
+		return NULL;
+
+	inp = PyUnicode_1BYTE_DATA(in);
+	outp = PyUnicode_1BYTE_DATA(out);
+	DO_ESCAPE(inp, inp_end, outp);
+	return out;
+}
+
+static PyObject*
+escape_unicode_kind2(PyUnicodeObject *in)
+{
+	Py_UCS2 *inp = PyUnicode_2BYTE_DATA(in);
+	Py_UCS2 *inp_end = inp + PyUnicode_GET_LENGTH(in);
+	Py_UCS2 *outp;
+	PyObject *out;
+	Py_ssize_t delta = 0;
+
+	GET_DELTA(inp, inp_end, delta);
+	if (!delta) {
+		Py_INCREF(in);
+		return (PyObject*)in;
+	}
+
+	out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta, 65535);
+	if (!out)
+		return NULL;
+
+	inp = PyUnicode_2BYTE_DATA(in);
+	outp = PyUnicode_2BYTE_DATA(out);
+	DO_ESCAPE(inp, inp_end, outp);
+	return out;
+}
+
+
+static PyObject*
+escape_unicode_kind4(PyUnicodeObject *in)
+{
+	Py_UCS4 *inp = PyUnicode_4BYTE_DATA(in);
+	Py_UCS4 *inp_end = inp + PyUnicode_GET_LENGTH(in);
+	Py_UCS4 *outp;
+	PyObject *out;
+	Py_ssize_t delta = 0;
+
+	GET_DELTA(inp, inp_end, delta);
+	if (!delta) {
+		Py_INCREF(in);
+		return (PyObject*)in;
+	}
+
+	out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta, 1114111);
+	if (!out)
+		return NULL;
+
+	inp = PyUnicode_4BYTE_DATA(in);
+	outp = PyUnicode_4BYTE_DATA(out);
+	DO_ESCAPE(inp, inp_end, outp);
+	return out;
+}
+
+static PyObject*
+escape_unicode(PyUnicodeObject *in)
+{
+	if (PyUnicode_READY(in))
+		return NULL;
+
+	switch (PyUnicode_KIND(in)) {
+	case PyUnicode_1BYTE_KIND:
+		return escape_unicode_kind1(in);
+	case PyUnicode_2BYTE_KIND:
+		return escape_unicode_kind2(in);
+	case PyUnicode_4BYTE_KIND:
+		return escape_unicode_kind4(in);
+	}
+	assert(0);  /* shouldn't happen */
+	return NULL;
+}
+#endif /* PY_MAJOR_VERSION < 3 */
+
+static PyObject*
+escape(PyObject *self, PyObject *text)
+{
+	static PyObject *id_html;
+	PyObject *s = NULL, *rv = NULL, *html;
+
+	if (id_html == NULL) {
+#if PY_MAJOR_VERSION < 3
+		id_html = PyString_InternFromString("__html__");
+#else
+		id_html = PyUnicode_InternFromString("__html__");
+#endif
+		if (id_html == NULL) {
+			return NULL;
+		}
+	}
+
+	/* we don't have to escape integers, bools or floats */
+	if (PyLong_CheckExact(text) ||
+#if PY_MAJOR_VERSION < 3
+	    PyInt_CheckExact(text) ||
+#endif
+	    PyFloat_CheckExact(text) || PyBool_Check(text) ||
+	    text == Py_None)
+		return PyObject_CallFunctionObjArgs(markup, text, NULL);
+
+	/* if the object has an __html__ method that performs the escaping */
+	html = PyObject_GetAttr(text ,id_html);
+	if (html) {
+		s = PyObject_CallObject(html, NULL);
+		Py_DECREF(html);
+		if (s == NULL) {
+			return NULL;
+		}
+		/* Convert to Markup object */
+		rv = PyObject_CallFunctionObjArgs(markup, (PyObject*)s, NULL);
+		Py_DECREF(s);
+		return rv;
+	}
+
+	/* otherwise make the object unicode if it isn't, then escape */
+	PyErr_Clear();
+	if (!PyUnicode_Check(text)) {
+#if PY_MAJOR_VERSION < 3
+		PyObject *unicode = PyObject_Unicode(text);
+#else
+		PyObject *unicode = PyObject_Str(text);
+#endif
+		if (!unicode)
+			return NULL;
+		s = escape_unicode((PyUnicodeObject*)unicode);
+		Py_DECREF(unicode);
+	}
+	else
+		s = escape_unicode((PyUnicodeObject*)text);
+
+	/* convert the unicode string into a markup object. */
+	rv = PyObject_CallFunctionObjArgs(markup, (PyObject*)s, NULL);
+	Py_DECREF(s);
+	return rv;
+}
+
+
+static PyObject*
+escape_silent(PyObject *self, PyObject *text)
+{
+	if (text != Py_None)
+		return escape(self, text);
+	return PyObject_CallFunctionObjArgs(markup, NULL);
+}
+
+
+static PyObject*
+soft_unicode(PyObject *self, PyObject *s)
+{
+	if (!PyUnicode_Check(s))
+#if PY_MAJOR_VERSION < 3
+		return PyObject_Unicode(s);
+#else
+		return PyObject_Str(s);
+#endif
+	Py_INCREF(s);
+	return s;
+}
+
+
+static PyMethodDef module_methods[] = {
+	{"escape", (PyCFunction)escape, METH_O,
+	 "escape(s) -> markup\n\n"
+	 "Convert the characters &, <, >, ', and \" in string s to HTML-safe\n"
+	 "sequences.  Use this if you need to display text that might contain\n"
+	 "such characters in HTML.  Marks return value as markup string."},
+	{"escape_silent", (PyCFunction)escape_silent, METH_O,
+	 "escape_silent(s) -> markup\n\n"
+	 "Like escape but converts None to an empty string."},
+	{"soft_unicode", (PyCFunction)soft_unicode, METH_O,
+	 "soft_unicode(object) -> string\n\n"
+         "Make a string unicode if it isn't already.  That way a markup\n"
+         "string is not converted back to unicode."},
+	{NULL, NULL, 0, NULL}		/* Sentinel */
+};
+
+
+#if PY_MAJOR_VERSION < 3
+
+#ifndef PyMODINIT_FUNC	/* declarations for DLL import/export */
+#define PyMODINIT_FUNC void
+#endif
+PyMODINIT_FUNC
+init_speedups(void)
+{
+	if (!init_constants())
+		return;
+
+	Py_InitModule3("markupsafe._speedups", module_methods, "");
+}
+
+#else /* Python 3.x module initialization */
+
+static struct PyModuleDef module_definition = {
+        PyModuleDef_HEAD_INIT,
+	"markupsafe._speedups",
+	NULL,
+	-1,
+	module_methods,
+	NULL,
+	NULL,
+	NULL,
+	NULL
+};
+
+PyMODINIT_FUNC
+PyInit__speedups(void)
+{
+	if (!init_constants())
+		return NULL;
+
+	return PyModule_Create(&module_definition);
+}
+
+#endif

env/lib/python3.5/site-packages/pip-20.0.2.dist-info/INSTALLER

+pip

env/lib/python3.5/site-packages/pip-20.0.2.dist-info/LICENSE.txt

+Copyright (c) 2008-2019 The pip developers (see AUTHORS.txt file)
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

env/lib/python3.5/site-packages/pip-20.0.2.dist-info/METADATA

+Metadata-Version: 2.1
+Name: pip
+Version: 20.0.2
+Summary: The PyPA recommended tool for installing Python packages.
+Home-page: https://pip.pypa.io/
+Author: The pip developers
+Author-email: pypa-dev@groups.google.com
+License: MIT
+Project-URL: Documentation, https://pip.pypa.io
+Project-URL: Source, https://github.com/pypa/pip
+Keywords: distutils easy_install egg setuptools wheel virtualenv
+Platform: UNKNOWN
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: Intended Audience :: Developers
+Classifier: License :: OSI Approved :: MIT License
+Classifier: Topic :: Software Development :: Build Tools
+Classifier: Programming Language :: Python
+Classifier: Programming Language :: Python :: 2
+Classifier: Programming Language :: Python :: 2.7
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3.5
+Classifier: Programming Language :: Python :: 3.6
+Classifier: Programming Language :: Python :: 3.7
+Classifier: Programming Language :: Python :: 3.8
+Classifier: Programming Language :: Python :: Implementation :: CPython
+Classifier: Programming Language :: Python :: Implementation :: PyPy
+Requires-Python: >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*
+
+pip - The Python Package Installer
+==================================
+
+.. image:: https://img.shields.io/pypi/v/pip.svg
+   :target: https://pypi.org/project/pip/
+
+.. image:: https://readthedocs.org/projects/pip/badge/?version=latest
+   :target: https://pip.pypa.io/en/latest
+
+pip is the `package installer`_ for Python. You can use pip to install packages from the `Python Package Index`_ and other indexes.
+
+Please take a look at our documentation for how to install and use pip:
+
+* `Installation`_
+* `Usage`_
+
+Updates are released regularly, with a new version every 3 months. More details can be found in our documentation:
+
+* `Release notes`_
+* `Release process`_
+
+If you find bugs, need help, or want to talk to the developers please use our mailing lists or chat rooms:
+
+* `Issue tracking`_
+* `Discourse channel`_
+* `User IRC`_
+
+If you want to get involved head over to GitHub to get the source code, look at our development documentation and feel free to jump on the developer mailing lists and chat rooms:
+
+* `GitHub page`_
+* `Dev documentation`_
+* `Dev mailing list`_
+* `Dev IRC`_
+
+Code of Conduct
+---------------
+
+Everyone interacting in the pip project's codebases, issue trackers, chat
+rooms, and mailing lists is expected to follow the `PyPA Code of Conduct`_.
+
+.. _package installer: https://packaging.python.org/guides/tool-recommendations/
+.. _Python Package Index: https://pypi.org
+.. _Installation: https://pip.pypa.io/en/stable/installing.html
+.. _Usage: https://pip.pypa.io/en/stable/
+.. _Release notes: https://pip.pypa.io/en/stable/news.html
+.. _Release process: https://pip.pypa.io/en/latest/development/release-process/
+.. _GitHub page: https://github.com/pypa/pip
+.. _Dev documentation: https://pip.pypa.io/en/latest/development
+.. _Issue tracking: https://github.com/pypa/pip/issues
+.. _Discourse channel: https://discuss.python.org/c/packaging
+.. _Dev mailing list: https://groups.google.com/forum/#!forum/pypa-dev
+.. _User IRC: https://webchat.freenode.net/?channels=%23pypa
+.. _Dev IRC: https://webchat.freenode.net/?channels=%23pypa-dev
+.. _PyPA Code of Conduct: https://www.pypa.io/en/latest/code-of-conduct/
+
+

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