Move //mojo/{public, edk} underneath //third_party

mojo/public/third_party/jinja2/compiler.py

Index: mojo/public/third_party/jinja2/compiler.py
diff --git a/mojo/public/third_party/jinja2/compiler.py b/mojo/public/third_party/jinja2/compiler.py
deleted file mode 100644
index 75a60b8d2d6b326d6248b64a0b74538316d4f82c..0000000000000000000000000000000000000000
--- a/mojo/public/third_party/jinja2/compiler.py
+++ /dev/null
@@ -1,1640 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.compiler
-    ~~~~~~~~~~~~~~~
-
-    Compiles nodes into python code.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-from itertools import chain
-from copy import deepcopy
-from keyword import iskeyword as is_python_keyword
-from jinja2 import nodes
-from jinja2.nodes import EvalContext
-from jinja2.visitor import NodeVisitor
-from jinja2.exceptions import TemplateAssertionError
-from jinja2.utils import Markup, concat, escape
-from jinja2._compat import range_type, next, text_type, string_types, \
-     iteritems, NativeStringIO, imap
-
-
-operators = {
-    'eq':       '==',
-    'ne':       '!=',
-    'gt':       '>',
-    'gteq':     '>=',
-    'lt':       '<',
-    'lteq':     '<=',
-    'in':       'in',
-    'notin':    'not in'
-}
-
-# what method to iterate over items do we want to use for dict iteration
-# in generated code?  on 2.x let's go with iteritems, on 3.x with items
-if hasattr(dict, 'iteritems'):
-    dict_item_iter = 'iteritems'
-else:
-    dict_item_iter = 'items'
-
-
-# does if 0: dummy(x) get us x into the scope?
-def unoptimize_before_dead_code():
-    x = 42
-    def f():
-        if 0: dummy(x)
-    return f
-
-# The getattr is necessary for pypy which does not set this attribute if
-# no closure is on the function
-unoptimize_before_dead_code = bool(
-    getattr(unoptimize_before_dead_code(), '__closure__', None))
-
-
-def generate(node, environment, name, filename, stream=None,
-             defer_init=False):
-    """Generate the python source for a node tree."""
-    if not isinstance(node, nodes.Template):
-        raise TypeError('Can\'t compile non template nodes')
-    generator = CodeGenerator(environment, name, filename, stream, defer_init)
-    generator.visit(node)
-    if stream is None:
-        return generator.stream.getvalue()
-
-
-def has_safe_repr(value):
-    """Does the node have a safe representation?"""
-    if value is None or value is NotImplemented or value is Ellipsis:
-        return True
-    if isinstance(value, (bool, int, float, complex, range_type,
-            Markup) + string_types):
-        return True
-    if isinstance(value, (tuple, list, set, frozenset)):
-        for item in value:
-            if not has_safe_repr(item):
-                return False
-        return True
-    elif isinstance(value, dict):
-        for key, value in iteritems(value):
-            if not has_safe_repr(key):
-                return False
-            if not has_safe_repr(value):
-                return False
-        return True
-    return False
-
-
-def find_undeclared(nodes, names):
-    """Check if the names passed are accessed undeclared.  The return value
-    is a set of all the undeclared names from the sequence of names found.
-    """
-    visitor = UndeclaredNameVisitor(names)
-    try:
-        for node in nodes:
-            visitor.visit(node)
-    except VisitorExit:
-        pass
-    return visitor.undeclared
-
-
-class Identifiers(object):
-    """Tracks the status of identifiers in frames."""
-
-    def __init__(self):
-        # variables that are known to be declared (probably from outer
-        # frames or because they are special for the frame)
-        self.declared = set()
-
-        # undeclared variables from outer scopes
-        self.outer_undeclared = set()
-
-        # names that are accessed without being explicitly declared by
-        # this one or any of the outer scopes.  Names can appear both in
-        # declared and undeclared.
-        self.undeclared = set()
-
-        # names that are declared locally
-        self.declared_locally = set()
-
-        # names that are declared by parameters
-        self.declared_parameter = set()
-
-    def add_special(self, name):
-        """Register a special name like `loop`."""
-        self.undeclared.discard(name)
-        self.declared.add(name)
-
-    def is_declared(self, name):
-        """Check if a name is declared in this or an outer scope."""
-        if name in self.declared_locally or name in self.declared_parameter:
-            return True
-        return name in self.declared
-
-    def copy(self):
-        return deepcopy(self)
-
-
-class Frame(object):
-    """Holds compile time information for us."""
-
-    def __init__(self, eval_ctx, parent=None):
-        self.eval_ctx = eval_ctx
-        self.identifiers = Identifiers()
-
-        # a toplevel frame is the root + soft frames such as if conditions.
-        self.toplevel = False
-
-        # the root frame is basically just the outermost frame, so no if
-        # conditions.  This information is used to optimize inheritance
-        # situations.
-        self.rootlevel = False
-
-        # in some dynamic inheritance situations the compiler needs to add
-        # write tests around output statements.
-        self.require_output_check = parent and parent.require_output_check
-
-        # inside some tags we are using a buffer rather than yield statements.
-        # this for example affects {% filter %} or {% macro %}.  If a frame
-        # is buffered this variable points to the name of the list used as
-        # buffer.
-        self.buffer = None
-
-        # the name of the block we're in, otherwise None.
-        self.block = parent and parent.block or None
-
-        # a set of actually assigned names
-        self.assigned_names = set()
-
-        # the parent of this frame
-        self.parent = parent
-
-        if parent is not None:
-            self.identifiers.declared.update(
-                parent.identifiers.declared |
-                parent.identifiers.declared_parameter |
-                parent.assigned_names
-            )
-            self.identifiers.outer_undeclared.update(
-                parent.identifiers.undeclared -
-                self.identifiers.declared
-            )
-            self.buffer = parent.buffer
-
-    def copy(self):
-        """Create a copy of the current one."""
-        rv = object.__new__(self.__class__)
-        rv.__dict__.update(self.__dict__)
-        rv.identifiers = object.__new__(self.identifiers.__class__)
-        rv.identifiers.__dict__.update(self.identifiers.__dict__)
-        return rv
-
-    def inspect(self, nodes):
-        """Walk the node and check for identifiers.  If the scope is hard (eg:
-        enforce on a python level) overrides from outer scopes are tracked
-        differently.
-        """
-        visitor = FrameIdentifierVisitor(self.identifiers)
-        for node in nodes:
-            visitor.visit(node)
-
-    def find_shadowed(self, extra=()):
-        """Find all the shadowed names.  extra is an iterable of variables
-        that may be defined with `add_special` which may occour scoped.
-        """
-        i = self.identifiers
-        return (i.declared | i.outer_undeclared) & \
-               (i.declared_locally | i.declared_parameter) | \
-               set(x for x in extra if i.is_declared(x))
-
-    def inner(self):
-        """Return an inner frame."""
-        return Frame(self.eval_ctx, self)
-
-    def soft(self):
-        """Return a soft frame.  A soft frame may not be modified as
-        standalone thing as it shares the resources with the frame it
-        was created of, but it's not a rootlevel frame any longer.
-        """
-        rv = self.copy()
-        rv.rootlevel = False
-        return rv
-
-    __copy__ = copy
-
-
-class VisitorExit(RuntimeError):
-    """Exception used by the `UndeclaredNameVisitor` to signal a stop."""
-
-
-class DependencyFinderVisitor(NodeVisitor):
-    """A visitor that collects filter and test calls."""
-
-    def __init__(self):
-        self.filters = set()
-        self.tests = set()
-
-    def visit_Filter(self, node):
-        self.generic_visit(node)
-        self.filters.add(node.name)
-
-    def visit_Test(self, node):
-        self.generic_visit(node)
-        self.tests.add(node.name)
-
-    def visit_Block(self, node):
-        """Stop visiting at blocks."""
-
-
-class UndeclaredNameVisitor(NodeVisitor):
-    """A visitor that checks if a name is accessed without being
-    declared.  This is different from the frame visitor as it will
-    not stop at closure frames.
-    """
-
-    def __init__(self, names):
-        self.names = set(names)
-        self.undeclared = set()
-
-    def visit_Name(self, node):
-        if node.ctx == 'load' and node.name in self.names:
-            self.undeclared.add(node.name)
-            if self.undeclared == self.names:
-                raise VisitorExit()
-        else:
-            self.names.discard(node.name)
-
-    def visit_Block(self, node):
-        """Stop visiting a blocks."""
-
-
-class FrameIdentifierVisitor(NodeVisitor):
-    """A visitor for `Frame.inspect`."""
-
-    def __init__(self, identifiers):
-        self.identifiers = identifiers
-
-    def visit_Name(self, node):
-        """All assignments to names go through this function."""
-        if node.ctx == 'store':
-            self.identifiers.declared_locally.add(node.name)
-        elif node.ctx == 'param':
-            self.identifiers.declared_parameter.add(node.name)
-        elif node.ctx == 'load' and not \
-             self.identifiers.is_declared(node.name):
-            self.identifiers.undeclared.add(node.name)
-
-    def visit_If(self, node):
-        self.visit(node.test)
-        real_identifiers = self.identifiers
-
-        old_names = real_identifiers.declared_locally | \
-                    real_identifiers.declared_parameter
-
-        def inner_visit(nodes):
-            if not nodes:
-                return set()
-            self.identifiers = real_identifiers.copy()
-            for subnode in nodes:
-                self.visit(subnode)
-            rv = self.identifiers.declared_locally - old_names
-            # we have to remember the undeclared variables of this branch
-            # because we will have to pull them.
-            real_identifiers.undeclared.update(self.identifiers.undeclared)
-            self.identifiers = real_identifiers
-            return rv
-
-        body = inner_visit(node.body)
-        else_ = inner_visit(node.else_ or ())
-
-        # the differences between the two branches are also pulled as
-        # undeclared variables
-        real_identifiers.undeclared.update(body.symmetric_difference(else_) -
-                                           real_identifiers.declared)
-
-        # remember those that are declared.
-        real_identifiers.declared_locally.update(body | else_)
-
-    def visit_Macro(self, node):
-        self.identifiers.declared_locally.add(node.name)
-
-    def visit_Import(self, node):
-        self.generic_visit(node)
-        self.identifiers.declared_locally.add(node.target)
-
-    def visit_FromImport(self, node):
-        self.generic_visit(node)
-        for name in node.names:
-            if isinstance(name, tuple):
-                self.identifiers.declared_locally.add(name[1])
-            else:
-                self.identifiers.declared_locally.add(name)
-
-    def visit_Assign(self, node):
-        """Visit assignments in the correct order."""
-        self.visit(node.node)
-        self.visit(node.target)
-
-    def visit_For(self, node):
-        """Visiting stops at for blocks.  However the block sequence
-        is visited as part of the outer scope.
-        """
-        self.visit(node.iter)
-
-    def visit_CallBlock(self, node):
-        self.visit(node.call)
-
-    def visit_FilterBlock(self, node):
-        self.visit(node.filter)
-
-    def visit_Scope(self, node):
-        """Stop visiting at scopes."""
-
-    def visit_Block(self, node):
-        """Stop visiting at blocks."""
-
-
-class CompilerExit(Exception):
-    """Raised if the compiler encountered a situation where it just
-    doesn't make sense to further process the code.  Any block that
-    raises such an exception is not further processed.
-    """
-
-
-class CodeGenerator(NodeVisitor):
-
-    def __init__(self, environment, name, filename, stream=None,
-                 defer_init=False):
-        if stream is None:
-            stream = NativeStringIO()
-        self.environment = environment
-        self.name = name
-        self.filename = filename
-        self.stream = stream
-        self.created_block_context = False
-        self.defer_init = defer_init
-
-        # aliases for imports
-        self.import_aliases = {}
-
-        # a registry for all blocks.  Because blocks are moved out
-        # into the global python scope they are registered here
-        self.blocks = {}
-
-        # the number of extends statements so far
-        self.extends_so_far = 0
-
-        # some templates have a rootlevel extends.  In this case we
-        # can safely assume that we're a child template and do some
-        # more optimizations.
-        self.has_known_extends = False
-
-        # the current line number
-        self.code_lineno = 1
-
-        # registry of all filters and tests (global, not block local)
-        self.tests = {}
-        self.filters = {}
-
-        # the debug information
-        self.debug_info = []
-        self._write_debug_info = None
-
-        # the number of new lines before the next write()
-        self._new_lines = 0
-
-        # the line number of the last written statement
-        self._last_line = 0
-
-        # true if nothing was written so far.
-        self._first_write = True
-
-        # used by the `temporary_identifier` method to get new
-        # unique, temporary identifier
-        self._last_identifier = 0
-
-        # the current indentation
-        self._indentation = 0
-
-    # -- Various compilation helpers
-
-    def fail(self, msg, lineno):
-        """Fail with a :exc:`TemplateAssertionError`."""
-        raise TemplateAssertionError(msg, lineno, self.name, self.filename)
-
-    def temporary_identifier(self):
-        """Get a new unique identifier."""
-        self._last_identifier += 1
-        return 't_%d' % self._last_identifier
-
-    def buffer(self, frame):
-        """Enable buffering for the frame from that point onwards."""
-        frame.buffer = self.temporary_identifier()
-        self.writeline('%s = []' % frame.buffer)
-
-    def return_buffer_contents(self, frame):
-        """Return the buffer contents of the frame."""
-        if frame.eval_ctx.volatile:
-            self.writeline('if context.eval_ctx.autoescape:')
-            self.indent()
-            self.writeline('return Markup(concat(%s))' % frame.buffer)
-            self.outdent()
-            self.writeline('else:')
-            self.indent()
-            self.writeline('return concat(%s)' % frame.buffer)
-            self.outdent()
-        elif frame.eval_ctx.autoescape:
-            self.writeline('return Markup(concat(%s))' % frame.buffer)
-        else:
-            self.writeline('return concat(%s)' % frame.buffer)
-
-    def indent(self):
-        """Indent by one."""
-        self._indentation += 1
-
-    def outdent(self, step=1):
-        """Outdent by step."""
-        self._indentation -= step
-
-    def start_write(self, frame, node=None):
-        """Yield or write into the frame buffer."""
-        if frame.buffer is None:
-            self.writeline('yield ', node)
-        else:
-            self.writeline('%s.append(' % frame.buffer, node)
-
-    def end_write(self, frame):
-        """End the writing process started by `start_write`."""
-        if frame.buffer is not None:
-            self.write(')')
-
-    def simple_write(self, s, frame, node=None):
-        """Simple shortcut for start_write + write + end_write."""
-        self.start_write(frame, node)
-        self.write(s)
-        self.end_write(frame)
-
-    def blockvisit(self, nodes, frame):
-        """Visit a list of nodes as block in a frame.  If the current frame
-        is no buffer a dummy ``if 0: yield None`` is written automatically
-        unless the force_generator parameter is set to False.
-        """
-        if frame.buffer is None:
-            self.writeline('if 0: yield None')
-        else:
-            self.writeline('pass')
-        try:
-            for node in nodes:
-                self.visit(node, frame)
-        except CompilerExit:
-            pass
-
-    def write(self, x):
-        """Write a string into the output stream."""
-        if self._new_lines:
-            if not self._first_write:
-                self.stream.write('\n' * self._new_lines)
-                self.code_lineno += self._new_lines
-                if self._write_debug_info is not None:
-                    self.debug_info.append((self._write_debug_info,
-                                            self.code_lineno))
-                    self._write_debug_info = None
-            self._first_write = False
-            self.stream.write('    ' * self._indentation)
-            self._new_lines = 0
-        self.stream.write(x)
-
-    def writeline(self, x, node=None, extra=0):
-        """Combination of newline and write."""
-        self.newline(node, extra)
-        self.write(x)
-
-    def newline(self, node=None, extra=0):
-        """Add one or more newlines before the next write."""
-        self._new_lines = max(self._new_lines, 1 + extra)
-        if node is not None and node.lineno != self._last_line:
-            self._write_debug_info = node.lineno
-            self._last_line = node.lineno
-
-    def signature(self, node, frame, extra_kwargs=None):
-        """Writes a function call to the stream for the current node.
-        A leading comma is added automatically.  The extra keyword
-        arguments may not include python keywords otherwise a syntax
-        error could occour.  The extra keyword arguments should be given
-        as python dict.
-        """
-        # if any of the given keyword arguments is a python keyword
-        # we have to make sure that no invalid call is created.
-        kwarg_workaround = False
-        for kwarg in chain((x.key for x in node.kwargs), extra_kwargs or ()):
-            if is_python_keyword(kwarg):
-                kwarg_workaround = True
-                break
-
-        for arg in node.args:
-            self.write(', ')
-            self.visit(arg, frame)
-
-        if not kwarg_workaround:
-            for kwarg in node.kwargs:
-                self.write(', ')
-                self.visit(kwarg, frame)
-            if extra_kwargs is not None:
-                for key, value in iteritems(extra_kwargs):
-                    self.write(', %s=%s' % (key, value))
-        if node.dyn_args:
-            self.write(', *')
-            self.visit(node.dyn_args, frame)
-
-        if kwarg_workaround:
-            if node.dyn_kwargs is not None:
-                self.write(', **dict({')
-            else:
-                self.write(', **{')
-            for kwarg in node.kwargs:
-                self.write('%r: ' % kwarg.key)
-                self.visit(kwarg.value, frame)
-                self.write(', ')
-            if extra_kwargs is not None:
-                for key, value in iteritems(extra_kwargs):
-                    self.write('%r: %s, ' % (key, value))
-            if node.dyn_kwargs is not None:
-                self.write('}, **')
-                self.visit(node.dyn_kwargs, frame)
-                self.write(')')
-            else:
-                self.write('}')
-
-        elif node.dyn_kwargs is not None:
-            self.write(', **')
-            self.visit(node.dyn_kwargs, frame)
-
-    def pull_locals(self, frame):
-        """Pull all the references identifiers into the local scope."""
-        for name in frame.identifiers.undeclared:
-            self.writeline('l_%s = context.resolve(%r)' % (name, name))
-
-    def pull_dependencies(self, nodes):
-        """Pull all the dependencies."""
-        visitor = DependencyFinderVisitor()
-        for node in nodes:
-            visitor.visit(node)
-        for dependency in 'filters', 'tests':
-            mapping = getattr(self, dependency)
-            for name in getattr(visitor, dependency):
-                if name not in mapping:
-                    mapping[name] = self.temporary_identifier()
-                self.writeline('%s = environment.%s[%r]' %
-                               (mapping[name], dependency, name))
-
-    def unoptimize_scope(self, frame):
-        """Disable Python optimizations for the frame."""
-        # XXX: this is not that nice but it has no real overhead.  It
-        # mainly works because python finds the locals before dead code
-        # is removed.  If that breaks we have to add a dummy function
-        # that just accepts the arguments and does nothing.
-        if frame.identifiers.declared:
-            self.writeline('%sdummy(%s)' % (
-                unoptimize_before_dead_code and 'if 0: ' or '',
-                ', '.join('l_' + name for name in frame.identifiers.declared)
-            ))
-
-    def push_scope(self, frame, extra_vars=()):
-        """This function returns all the shadowed variables in a dict
-        in the form name: alias and will write the required assignments
-        into the current scope.  No indentation takes place.
-
-        This also predefines locally declared variables from the loop
-        body because under some circumstances it may be the case that
-
-        `extra_vars` is passed to `Frame.find_shadowed`.
-        """
-        aliases = {}
-        for name in frame.find_shadowed(extra_vars):
-            aliases[name] = ident = self.temporary_identifier()
-            self.writeline('%s = l_%s' % (ident, name))
-        to_declare = set()
-        for name in frame.identifiers.declared_locally:
-            if name not in aliases:
-                to_declare.add('l_' + name)
-        if to_declare:
-            self.writeline(' = '.join(to_declare) + ' = missing')
-        return aliases
-
-    def pop_scope(self, aliases, frame):
-        """Restore all aliases and delete unused variables."""
-        for name, alias in iteritems(aliases):
-            self.writeline('l_%s = %s' % (name, alias))
-        to_delete = set()
-        for name in frame.identifiers.declared_locally:
-            if name not in aliases:
-                to_delete.add('l_' + name)
-        if to_delete:
-            # we cannot use the del statement here because enclosed
-            # scopes can trigger a SyntaxError:
-            #   a = 42; b = lambda: a; del a
-            self.writeline(' = '.join(to_delete) + ' = missing')
-
-    def function_scoping(self, node, frame, children=None,
-                         find_special=True):
-        """In Jinja a few statements require the help of anonymous
-        functions.  Those are currently macros and call blocks and in
-        the future also recursive loops.  As there is currently
-        technical limitation that doesn't allow reading and writing a
-        variable in a scope where the initial value is coming from an
-        outer scope, this function tries to fall back with a common
-        error message.  Additionally the frame passed is modified so
-        that the argumetns are collected and callers are looked up.
-
-        This will return the modified frame.
-        """
-        # we have to iterate twice over it, make sure that works
-        if children is None:
-            children = node.iter_child_nodes()
-        children = list(children)
-        func_frame = frame.inner()
-        func_frame.inspect(children)
-
-        # variables that are undeclared (accessed before declaration) and
-        # declared locally *and* part of an outside scope raise a template
-        # assertion error. Reason: we can't generate reasonable code from
-        # it without aliasing all the variables.
-        # this could be fixed in Python 3 where we have the nonlocal
-        # keyword or if we switch to bytecode generation
-        overridden_closure_vars = (
-            func_frame.identifiers.undeclared &
-            func_frame.identifiers.declared &
-            (func_frame.identifiers.declared_locally |
-             func_frame.identifiers.declared_parameter)
-        )
-        if overridden_closure_vars:
-            self.fail('It\'s not possible to set and access variables '
-                      'derived from an outer scope! (affects: %s)' %
-                      ', '.join(sorted(overridden_closure_vars)), node.lineno)
-
-        # remove variables from a closure from the frame's undeclared
-        # identifiers.
-        func_frame.identifiers.undeclared -= (
-            func_frame.identifiers.undeclared &
-            func_frame.identifiers.declared
-        )
-
-        # no special variables for this scope, abort early
-        if not find_special:
-            return func_frame
-
-        func_frame.accesses_kwargs = False
-        func_frame.accesses_varargs = False
-        func_frame.accesses_caller = False
-        func_frame.arguments = args = ['l_' + x.name for x in node.args]
-
-        undeclared = find_undeclared(children, ('caller', 'kwargs', 'varargs'))
-
-        if 'caller' in undeclared:
-            func_frame.accesses_caller = True
-            func_frame.identifiers.add_special('caller')
-            args.append('l_caller')
-        if 'kwargs' in undeclared:
-            func_frame.accesses_kwargs = True
-            func_frame.identifiers.add_special('kwargs')
-            args.append('l_kwargs')
-        if 'varargs' in undeclared:
-            func_frame.accesses_varargs = True
-            func_frame.identifiers.add_special('varargs')
-            args.append('l_varargs')
-        return func_frame
-
-    def macro_body(self, node, frame, children=None):
-        """Dump the function def of a macro or call block."""
-        frame = self.function_scoping(node, frame, children)
-        # macros are delayed, they never require output checks
-        frame.require_output_check = False
-        args = frame.arguments
-        # XXX: this is an ugly fix for the loop nesting bug
-        # (tests.test_old_bugs.test_loop_call_bug).  This works around
-        # a identifier nesting problem we have in general.  It's just more
-        # likely to happen in loops which is why we work around it.  The
-        # real solution would be "nonlocal" all the identifiers that are
-        # leaking into a new python frame and might be used both unassigned
-        # and assigned.
-        if 'loop' in frame.identifiers.declared:
-            args = args + ['l_loop=l_loop']
-        self.writeline('def macro(%s):' % ', '.join(args), node)
-        self.indent()
-        self.buffer(frame)
-        self.pull_locals(frame)
-        self.blockvisit(node.body, frame)
-        self.return_buffer_contents(frame)
-        self.outdent()
-        return frame
-
-    def macro_def(self, node, frame):
-        """Dump the macro definition for the def created by macro_body."""
-        arg_tuple = ', '.join(repr(x.name) for x in node.args)
-        name = getattr(node, 'name', None)
-        if len(node.args) == 1:
-            arg_tuple += ','
-        self.write('Macro(environment, macro, %r, (%s), (' %
-                   (name, arg_tuple))
-        for arg in node.defaults:
-            self.visit(arg, frame)
-            self.write(', ')
-        self.write('), %r, %r, %r)' % (
-            bool(frame.accesses_kwargs),
-            bool(frame.accesses_varargs),
-            bool(frame.accesses_caller)
-        ))
-
-    def position(self, node):
-        """Return a human readable position for the node."""
-        rv = 'line %d' % node.lineno
-        if self.name is not None:
-            rv += ' in ' + repr(self.name)
-        return rv
-
-    # -- Statement Visitors
-
-    def visit_Template(self, node, frame=None):
-        assert frame is None, 'no root frame allowed'
-        eval_ctx = EvalContext(self.environment, self.name)
-
-        from jinja2.runtime import __all__ as exported
-        self.writeline('from __future__ import division')
-        self.writeline('from jinja2.runtime import ' + ', '.join(exported))
-        if not unoptimize_before_dead_code:
-            self.writeline('dummy = lambda *x: None')
-
-        # if we want a deferred initialization we cannot move the
-        # environment into a local name
-        envenv = not self.defer_init and ', environment=environment' or ''
-
-        # do we have an extends tag at all?  If not, we can save some
-        # overhead by just not processing any inheritance code.
-        have_extends = node.find(nodes.Extends) is not None
-
-        # find all blocks
-        for block in node.find_all(nodes.Block):
-            if block.name in self.blocks:
-                self.fail('block %r defined twice' % block.name, block.lineno)
-            self.blocks[block.name] = block
-
-        # find all imports and import them
-        for import_ in node.find_all(nodes.ImportedName):
-            if import_.importname not in self.import_aliases:
-                imp = import_.importname
-                self.import_aliases[imp] = alias = self.temporary_identifier()
-                if '.' in imp:
-                    module, obj = imp.rsplit('.', 1)
-                    self.writeline('from %s import %s as %s' %
-                                   (module, obj, alias))
-                else:
-                    self.writeline('import %s as %s' % (imp, alias))
-
-        # add the load name
-        self.writeline('name = %r' % self.name)
-
-        # generate the root render function.
-        self.writeline('def root(context%s):' % envenv, extra=1)
-
-        # process the root
-        frame = Frame(eval_ctx)
-        frame.inspect(node.body)
-        frame.toplevel = frame.rootlevel = True
-        frame.require_output_check = have_extends and not self.has_known_extends
-        self.indent()
-        if have_extends:
-            self.writeline('parent_template = None')
-        if 'self' in find_undeclared(node.body, ('self',)):
-            frame.identifiers.add_special('self')
-            self.writeline('l_self = TemplateReference(context)')
-        self.pull_locals(frame)
-        self.pull_dependencies(node.body)
-        self.blockvisit(node.body, frame)
-        self.outdent()
-
-        # make sure that the parent root is called.
-        if have_extends:
-            if not self.has_known_extends:
-                self.indent()
-                self.writeline('if parent_template is not None:')
-            self.indent()
-            self.writeline('for event in parent_template.'
-                           'root_render_func(context):')
-            self.indent()
-            self.writeline('yield event')
-            self.outdent(2 + (not self.has_known_extends))
-
-        # at this point we now have the blocks collected and can visit them too.
-        for name, block in iteritems(self.blocks):
-            block_frame = Frame(eval_ctx)
-            block_frame.inspect(block.body)
-            block_frame.block = name
-            self.writeline('def block_%s(context%s):' % (name, envenv),
-                           block, 1)
-            self.indent()
-            undeclared = find_undeclared(block.body, ('self', 'super'))
-            if 'self' in undeclared:
-                block_frame.identifiers.add_special('self')
-                self.writeline('l_self = TemplateReference(context)')
-            if 'super' in undeclared:
-                block_frame.identifiers.add_special('super')
-                self.writeline('l_super = context.super(%r, '
-                               'block_%s)' % (name, name))
-            self.pull_locals(block_frame)
-            self.pull_dependencies(block.body)
-            self.blockvisit(block.body, block_frame)
-            self.outdent()
-
-        self.writeline('blocks = {%s}' % ', '.join('%r: block_%s' % (x, x)
-                                                   for x in self.blocks),
-                       extra=1)
-
-        # add a function that returns the debug info
-        self.writeline('debug_info = %r' % '&'.join('%s=%s' % x for x
-                                                    in self.debug_info))
-
-    def visit_Block(self, node, frame):
-        """Call a block and register it for the template."""
-        level = 1
-        if frame.toplevel:
-            # if we know that we are a child template, there is no need to
-            # check if we are one
-            if self.has_known_extends:
-                return
-            if self.extends_so_far > 0:
-                self.writeline('if parent_template is None:')
-                self.indent()
-                level += 1
-        context = node.scoped and 'context.derived(locals())' or 'context'
-        self.writeline('for event in context.blocks[%r][0](%s):' % (
-                       node.name, context), node)
-        self.indent()
-        self.simple_write('event', frame)
-        self.outdent(level)
-
-    def visit_Extends(self, node, frame):
-        """Calls the extender."""
-        if not frame.toplevel:
-            self.fail('cannot use extend from a non top-level scope',
-                      node.lineno)
-
-        # if the number of extends statements in general is zero so
-        # far, we don't have to add a check if something extended
-        # the template before this one.
-        if self.extends_so_far > 0:
-
-            # if we have a known extends we just add a template runtime
-            # error into the generated code.  We could catch that at compile
-            # time too, but i welcome it not to confuse users by throwing the
-            # same error at different times just "because we can".
-            if not self.has_known_extends:
-                self.writeline('if parent_template is not None:')
-                self.indent()
-            self.writeline('raise TemplateRuntimeError(%r)' %
-                           'extended multiple times')
-
-            # if we have a known extends already we don't need that code here
-            # as we know that the template execution will end here.
-            if self.has_known_extends:
-                raise CompilerExit()
-            else:
-                self.outdent()
-
-        self.writeline('parent_template = environment.get_template(', node)
-        self.visit(node.template, frame)
-        self.write(', %r)' % self.name)
-        self.writeline('for name, parent_block in parent_template.'
-                       'blocks.%s():' % dict_item_iter)
-        self.indent()
-        self.writeline('context.blocks.setdefault(name, []).'
-                       'append(parent_block)')
-        self.outdent()
-
-        # if this extends statement was in the root level we can take
-        # advantage of that information and simplify the generated code
-        # in the top level from this point onwards
-        if frame.rootlevel:
-            self.has_known_extends = True
-
-        # and now we have one more
-        self.extends_so_far += 1
-
-    def visit_Include(self, node, frame):
-        """Handles includes."""
-        if node.with_context:
-            self.unoptimize_scope(frame)
-        if node.ignore_missing:
-            self.writeline('try:')
-            self.indent()
-
-        func_name = 'get_or_select_template'
-        if isinstance(node.template, nodes.Const):
-            if isinstance(node.template.value, string_types):
-                func_name = 'get_template'
-            elif isinstance(node.template.value, (tuple, list)):
-                func_name = 'select_template'
-        elif isinstance(node.template, (nodes.Tuple, nodes.List)):
-            func_name = 'select_template'
-
-        self.writeline('template = environment.%s(' % func_name, node)
-        self.visit(node.template, frame)
-        self.write(', %r)' % self.name)
-        if node.ignore_missing:
-            self.outdent()
-            self.writeline('except TemplateNotFound:')
-            self.indent()
-            self.writeline('pass')
-            self.outdent()
-            self.writeline('else:')
-            self.indent()
-
-        if node.with_context:
-            self.writeline('for event in template.root_render_func('
-                           'template.new_context(context.parent, True, '
-                           'locals())):')
-        else:
-            self.writeline('for event in template.module._body_stream:')
-
-        self.indent()
-        self.simple_write('event', frame)
-        self.outdent()
-
-        if node.ignore_missing:
-            self.outdent()
-
-    def visit_Import(self, node, frame):
-        """Visit regular imports."""
-        if node.with_context:
-            self.unoptimize_scope(frame)
-        self.writeline('l_%s = ' % node.target, node)
-        if frame.toplevel:
-            self.write('context.vars[%r] = ' % node.target)
-        self.write('environment.get_template(')
-        self.visit(node.template, frame)
-        self.write(', %r).' % self.name)
-        if node.with_context:
-            self.write('make_module(context.parent, True, locals())')
-        else:
-            self.write('module')
-        if frame.toplevel and not node.target.startswith('_'):
-            self.writeline('context.exported_vars.discard(%r)' % node.target)
-        frame.assigned_names.add(node.target)
-
-    def visit_FromImport(self, node, frame):
-        """Visit named imports."""
-        self.newline(node)
-        self.write('included_template = environment.get_template(')
-        self.visit(node.template, frame)
-        self.write(', %r).' % self.name)
-        if node.with_context:
-            self.write('make_module(context.parent, True)')
-        else:
-            self.write('module')
-
-        var_names = []
-        discarded_names = []
-        for name in node.names:
-            if isinstance(name, tuple):
-                name, alias = name
-            else:
-                alias = name
-            self.writeline('l_%s = getattr(included_template, '
-                           '%r, missing)' % (alias, name))
-            self.writeline('if l_%s is missing:' % alias)
-            self.indent()
-            self.writeline('l_%s = environment.undefined(%r %% '
-                           'included_template.__name__, '
-                           'name=%r)' %
-                           (alias, 'the template %%r (imported on %s) does '
-                           'not export the requested name %s' % (
-                                self.position(node),
-                                repr(name)
-                           ), name))
-            self.outdent()
-            if frame.toplevel:
-                var_names.append(alias)
-                if not alias.startswith('_'):
-                    discarded_names.append(alias)
-            frame.assigned_names.add(alias)
-
-        if var_names:
-            if len(var_names) == 1:
-                name = var_names[0]
-                self.writeline('context.vars[%r] = l_%s' % (name, name))
-            else:
-                self.writeline('context.vars.update({%s})' % ', '.join(
-                    '%r: l_%s' % (name, name) for name in var_names
-                ))
-        if discarded_names:
-            if len(discarded_names) == 1:
-                self.writeline('context.exported_vars.discard(%r)' %
-                               discarded_names[0])
-            else:
-                self.writeline('context.exported_vars.difference_'
-                               'update((%s))' % ', '.join(imap(repr, discarded_names)))
-
-    def visit_For(self, node, frame):
-        # when calculating the nodes for the inner frame we have to exclude
-        # the iterator contents from it
-        children = node.iter_child_nodes(exclude=('iter',))
-        if node.recursive:
-            loop_frame = self.function_scoping(node, frame, children,
-                                               find_special=False)
-        else:
-            loop_frame = frame.inner()
-            loop_frame.inspect(children)
-
-        # try to figure out if we have an extended loop.  An extended loop
-        # is necessary if the loop is in recursive mode if the special loop
-        # variable is accessed in the body.
-        extended_loop = node.recursive or 'loop' in \
-                        find_undeclared(node.iter_child_nodes(
-                            only=('body',)), ('loop',))
-
-        # if we don't have an recursive loop we have to find the shadowed
-        # variables at that point.  Because loops can be nested but the loop
-        # variable is a special one we have to enforce aliasing for it.
-        if not node.recursive:
-            aliases = self.push_scope(loop_frame, ('loop',))
-
-        # otherwise we set up a buffer and add a function def
-        else:
-            self.writeline('def loop(reciter, loop_render_func, depth=0):', node)
-            self.indent()
-            self.buffer(loop_frame)
-            aliases = {}
-
-        # make sure the loop variable is a special one and raise a template
-        # assertion error if a loop tries to write to loop
-        if extended_loop:
-            self.writeline('l_loop = missing')
-            loop_frame.identifiers.add_special('loop')
-        for name in node.find_all(nodes.Name):
-            if name.ctx == 'store' and name.name == 'loop':
-                self.fail('Can\'t assign to special loop variable '
-                          'in for-loop target', name.lineno)
-
-        self.pull_locals(loop_frame)
-        if node.else_:
-            iteration_indicator = self.temporary_identifier()
-            self.writeline('%s = 1' % iteration_indicator)
-
-        # Create a fake parent loop if the else or test section of a
-        # loop is accessing the special loop variable and no parent loop
-        # exists.
-        if 'loop' not in aliases and 'loop' in find_undeclared(
-           node.iter_child_nodes(only=('else_', 'test')), ('loop',)):
-            self.writeline("l_loop = environment.undefined(%r, name='loop')" %
-                ("'loop' is undefined. the filter section of a loop as well "
-                 "as the else block don't have access to the special 'loop'"
-                 " variable of the current loop.  Because there is no parent "
-                 "loop it's undefined.  Happened in loop on %s" %
-                 self.position(node)))
-
-        self.writeline('for ', node)
-        self.visit(node.target, loop_frame)
-        self.write(extended_loop and ', l_loop in LoopContext(' or ' in ')
-
-        # if we have an extened loop and a node test, we filter in the
-        # "outer frame".
-        if extended_loop and node.test is not None:
-            self.write('(')
-            self.visit(node.target, loop_frame)
-            self.write(' for ')
-            self.visit(node.target, loop_frame)
-            self.write(' in ')
-            if node.recursive:
-                self.write('reciter')
-            else:
-                self.visit(node.iter, loop_frame)
-            self.write(' if (')
-            test_frame = loop_frame.copy()
-            self.visit(node.test, test_frame)
-            self.write('))')
-
-        elif node.recursive:
-            self.write('reciter')
-        else:
-            self.visit(node.iter, loop_frame)
-
-        if node.recursive:
-            self.write(', loop_render_func, depth):')
-        else:
-            self.write(extended_loop and '):' or ':')
-
-        # tests in not extended loops become a continue
-        if not extended_loop and node.test is not None:
-            self.indent()
-            self.writeline('if not ')
-            self.visit(node.test, loop_frame)
-            self.write(':')
-            self.indent()
-            self.writeline('continue')
-            self.outdent(2)
-
-        self.indent()
-        self.blockvisit(node.body, loop_frame)
-        if node.else_:
-            self.writeline('%s = 0' % iteration_indicator)
-        self.outdent()
-
-        if node.else_:
-            self.writeline('if %s:' % iteration_indicator)
-            self.indent()
-            self.blockvisit(node.else_, loop_frame)
-            self.outdent()
-
-        # reset the aliases if there are any.
-        if not node.recursive:
-            self.pop_scope(aliases, loop_frame)
-
-        # if the node was recursive we have to return the buffer contents
-        # and start the iteration code
-        if node.recursive:
-            self.return_buffer_contents(loop_frame)
-            self.outdent()
-            self.start_write(frame, node)
-            self.write('loop(')
-            self.visit(node.iter, frame)
-            self.write(', loop)')
-            self.end_write(frame)
-
-    def visit_If(self, node, frame):
-        if_frame = frame.soft()
-        self.writeline('if ', node)
-        self.visit(node.test, if_frame)
-        self.write(':')
-        self.indent()
-        self.blockvisit(node.body, if_frame)
-        self.outdent()
-        if node.else_:
-            self.writeline('else:')
-            self.indent()
-            self.blockvisit(node.else_, if_frame)
-            self.outdent()
-
-    def visit_Macro(self, node, frame):
-        macro_frame = self.macro_body(node, frame)
-        self.newline()
-        if frame.toplevel:
-            if not node.name.startswith('_'):
-                self.write('context.exported_vars.add(%r)' % node.name)
-            self.writeline('context.vars[%r] = ' % node.name)
-        self.write('l_%s = ' % node.name)
-        self.macro_def(node, macro_frame)
-        frame.assigned_names.add(node.name)
-
-    def visit_CallBlock(self, node, frame):
-        children = node.iter_child_nodes(exclude=('call',))
-        call_frame = self.macro_body(node, frame, children)
-        self.writeline('caller = ')
-        self.macro_def(node, call_frame)
-        self.start_write(frame, node)
-        self.visit_Call(node.call, call_frame, forward_caller=True)
-        self.end_write(frame)
-
-    def visit_FilterBlock(self, node, frame):
-        filter_frame = frame.inner()
-        filter_frame.inspect(node.iter_child_nodes())
-        aliases = self.push_scope(filter_frame)
-        self.pull_locals(filter_frame)
-        self.buffer(filter_frame)
-        self.blockvisit(node.body, filter_frame)
-        self.start_write(frame, node)
-        self.visit_Filter(node.filter, filter_frame)
-        self.end_write(frame)
-        self.pop_scope(aliases, filter_frame)
-
-    def visit_ExprStmt(self, node, frame):
-        self.newline(node)
-        self.visit(node.node, frame)
-
-    def visit_Output(self, node, frame):
-        # if we have a known extends statement, we don't output anything
-        # if we are in a require_output_check section
-        if self.has_known_extends and frame.require_output_check:
-            return
-
-        if self.environment.finalize:
-            finalize = lambda x: text_type(self.environment.finalize(x))
-        else:
-            finalize = text_type
-
-        # if we are inside a frame that requires output checking, we do so
-        outdent_later = False
-        if frame.require_output_check:
-            self.writeline('if parent_template is None:')
-            self.indent()
-            outdent_later = True
-
-        # try to evaluate as many chunks as possible into a static
-        # string at compile time.
-        body = []
-        for child in node.nodes:
-            try:
-                const = child.as_const(frame.eval_ctx)
-            except nodes.Impossible:
-                body.append(child)
-                continue
-            # the frame can't be volatile here, becaus otherwise the
-            # as_const() function would raise an Impossible exception
-            # at that point.
-            try:
-                if frame.eval_ctx.autoescape:
-                    if hasattr(const, '__html__'):
-                        const = const.__html__()
-                    else:
-                        const = escape(const)
-                const = finalize(const)
-            except Exception:
-                # if something goes wrong here we evaluate the node
-                # at runtime for easier debugging
-                body.append(child)
-                continue
-            if body and isinstance(body[-1], list):
-                body[-1].append(const)
-            else:
-                body.append([const])
-
-        # if we have less than 3 nodes or a buffer we yield or extend/append
-        if len(body) < 3 or frame.buffer is not None:
-            if frame.buffer is not None:
-                # for one item we append, for more we extend
-                if len(body) == 1:
-                    self.writeline('%s.append(' % frame.buffer)
-                else:
-                    self.writeline('%s.extend((' % frame.buffer)
-                self.indent()
-            for item in body:
-                if isinstance(item, list):
-                    val = repr(concat(item))
-                    if frame.buffer is None:
-                        self.writeline('yield ' + val)
-                    else:
-                        self.writeline(val + ', ')
-                else:
-                    if frame.buffer is None:
-                        self.writeline('yield ', item)
-                    else:
-                        self.newline(item)
-                    close = 1
-                    if frame.eval_ctx.volatile:
-                        self.write('(context.eval_ctx.autoescape and'
-                                   ' escape or to_string)(')
-                    elif frame.eval_ctx.autoescape:
-                        self.write('escape(')
-                    else:
-                        self.write('to_string(')
-                    if self.environment.finalize is not None:
-                        self.write('environment.finalize(')
-                        close += 1
-                    self.visit(item, frame)
-                    self.write(')' * close)
-                    if frame.buffer is not None:
-                        self.write(', ')
-            if frame.buffer is not None:
-                # close the open parentheses
-                self.outdent()
-                self.writeline(len(body) == 1 and ')' or '))')
-
-        # otherwise we create a format string as this is faster in that case
-        else:
-            format = []
-            arguments = []
-            for item in body:
-                if isinstance(item, list):
-                    format.append(concat(item).replace('%', '%%'))
-                else:
-                    format.append('%s')
-                    arguments.append(item)
-            self.writeline('yield ')
-            self.write(repr(concat(format)) + ' % (')
-            idx = -1
-            self.indent()
-            for argument in arguments:
-                self.newline(argument)
-                close = 0
-                if frame.eval_ctx.volatile:
-                    self.write('(context.eval_ctx.autoescape and'
-                               ' escape or to_string)(')
-                    close += 1
-                elif frame.eval_ctx.autoescape:
-                    self.write('escape(')
-                    close += 1
-                if self.environment.finalize is not None:
-                    self.write('environment.finalize(')
-                    close += 1
-                self.visit(argument, frame)
-                self.write(')' * close + ', ')
-            self.outdent()
-            self.writeline(')')
-
-        if outdent_later:
-            self.outdent()
-
-    def visit_Assign(self, node, frame):
-        self.newline(node)
-        # toplevel assignments however go into the local namespace and
-        # the current template's context.  We create a copy of the frame
-        # here and add a set so that the Name visitor can add the assigned
-        # names here.
-        if frame.toplevel:
-            assignment_frame = frame.copy()
-            assignment_frame.toplevel_assignments = set()
-        else:
-            assignment_frame = frame
-        self.visit(node.target, assignment_frame)
-        self.write(' = ')
-        self.visit(node.node, frame)
-
-        # make sure toplevel assignments are added to the context.
-        if frame.toplevel:
-            public_names = [x for x in assignment_frame.toplevel_assignments
-                            if not x.startswith('_')]
-            if len(assignment_frame.toplevel_assignments) == 1:
-                name = next(iter(assignment_frame.toplevel_assignments))
-                self.writeline('context.vars[%r] = l_%s' % (name, name))
-            else:
-                self.writeline('context.vars.update({')
-                for idx, name in enumerate(assignment_frame.toplevel_assignments):
-                    if idx:
-                        self.write(', ')
-                    self.write('%r: l_%s' % (name, name))
-                self.write('})')
-            if public_names:
-                if len(public_names) == 1:
-                    self.writeline('context.exported_vars.add(%r)' %
-                                   public_names[0])
-                else:
-                    self.writeline('context.exported_vars.update((%s))' %
-                                   ', '.join(imap(repr, public_names)))
-
-    # -- Expression Visitors
-
-    def visit_Name(self, node, frame):
-        if node.ctx == 'store' and frame.toplevel:
-            frame.toplevel_assignments.add(node.name)
-        self.write('l_' + node.name)
-        frame.assigned_names.add(node.name)
-
-    def visit_Const(self, node, frame):
-        val = node.value
-        if isinstance(val, float):
-            self.write(str(val))
-        else:
-            self.write(repr(val))
-
-    def visit_TemplateData(self, node, frame):
-        try:
-            self.write(repr(node.as_const(frame.eval_ctx)))
-        except nodes.Impossible:
-            self.write('(context.eval_ctx.autoescape and Markup or identity)(%r)'
-                       % node.data)
-
-    def visit_Tuple(self, node, frame):
-        self.write('(')
-        idx = -1
-        for idx, item in enumerate(node.items):
-            if idx:
-                self.write(', ')
-            self.visit(item, frame)
-        self.write(idx == 0 and ',)' or ')')
-
-    def visit_List(self, node, frame):
-        self.write('[')
-        for idx, item in enumerate(node.items):
-            if idx:
-                self.write(', ')
-            self.visit(item, frame)
-        self.write(']')
-
-    def visit_Dict(self, node, frame):
-        self.write('{')
-        for idx, item in enumerate(node.items):
-            if idx:
-                self.write(', ')
-            self.visit(item.key, frame)
-            self.write(': ')
-            self.visit(item.value, frame)
-        self.write('}')
-
-    def binop(operator, interceptable=True):
-        def visitor(self, node, frame):
-            if self.environment.sandboxed and \
-               operator in self.environment.intercepted_binops:
-                self.write('environment.call_binop(context, %r, ' % operator)
-                self.visit(node.left, frame)
-                self.write(', ')
-                self.visit(node.right, frame)
-            else:
-                self.write('(')
-                self.visit(node.left, frame)
-                self.write(' %s ' % operator)
-                self.visit(node.right, frame)
-            self.write(')')
-        return visitor
-
-    def uaop(operator, interceptable=True):
-        def visitor(self, node, frame):
-            if self.environment.sandboxed and \
-               operator in self.environment.intercepted_unops:
-                self.write('environment.call_unop(context, %r, ' % operator)
-                self.visit(node.node, frame)
-            else:
-                self.write('(' + operator)
-                self.visit(node.node, frame)
-            self.write(')')
-        return visitor
-
-    visit_Add = binop('+')
-    visit_Sub = binop('-')
-    visit_Mul = binop('*')
-    visit_Div = binop('/')
-    visit_FloorDiv = binop('//')
-    visit_Pow = binop('**')
-    visit_Mod = binop('%')
-    visit_And = binop('and', interceptable=False)
-    visit_Or = binop('or', interceptable=False)
-    visit_Pos = uaop('+')
-    visit_Neg = uaop('-')
-    visit_Not = uaop('not ', interceptable=False)
-    del binop, uaop
-
-    def visit_Concat(self, node, frame):
-        if frame.eval_ctx.volatile:
-            func_name = '(context.eval_ctx.volatile and' \
-                        ' markup_join or unicode_join)'
-        elif frame.eval_ctx.autoescape:
-            func_name = 'markup_join'
-        else:
-            func_name = 'unicode_join'
-        self.write('%s((' % func_name)
-        for arg in node.nodes:
-            self.visit(arg, frame)
-            self.write(', ')
-        self.write('))')
-
-    def visit_Compare(self, node, frame):
-        self.visit(node.expr, frame)
-        for op in node.ops:
-            self.visit(op, frame)
-
-    def visit_Operand(self, node, frame):
-        self.write(' %s ' % operators[node.op])
-        self.visit(node.expr, frame)
-
-    def visit_Getattr(self, node, frame):
-        self.write('environment.getattr(')
-        self.visit(node.node, frame)
-        self.write(', %r)' % node.attr)
-
-    def visit_Getitem(self, node, frame):
-        # slices bypass the environment getitem method.
-        if isinstance(node.arg, nodes.Slice):
-            self.visit(node.node, frame)
-            self.write('[')
-            self.visit(node.arg, frame)
-            self.write(']')
-        else:
-            self.write('environment.getitem(')
-            self.visit(node.node, frame)
-            self.write(', ')
-            self.visit(node.arg, frame)
-            self.write(')')
-
-    def visit_Slice(self, node, frame):
-        if node.start is not None:
-            self.visit(node.start, frame)
-        self.write(':')
-        if node.stop is not None:
-            self.visit(node.stop, frame)
-        if node.step is not None:
-            self.write(':')
-            self.visit(node.step, frame)
-
-    def visit_Filter(self, node, frame):
-        self.write(self.filters[node.name] + '(')
-        func = self.environment.filters.get(node.name)
-        if func is None:
-            self.fail('no filter named %r' % node.name, node.lineno)
-        if getattr(func, 'contextfilter', False):
-            self.write('context, ')
-        elif getattr(func, 'evalcontextfilter', False):
-            self.write('context.eval_ctx, ')
-        elif getattr(func, 'environmentfilter', False):
-            self.write('environment, ')
-
-        # if the filter node is None we are inside a filter block
-        # and want to write to the current buffer
-        if node.node is not None:
-            self.visit(node.node, frame)
-        elif frame.eval_ctx.volatile:
-            self.write('(context.eval_ctx.autoescape and'
-                       ' Markup(concat(%s)) or concat(%s))' %
-                       (frame.buffer, frame.buffer))
-        elif frame.eval_ctx.autoescape:
-            self.write('Markup(concat(%s))' % frame.buffer)
-        else:
-            self.write('concat(%s)' % frame.buffer)
-        self.signature(node, frame)
-        self.write(')')
-
-    def visit_Test(self, node, frame):
-        self.write(self.tests[node.name] + '(')
-        if node.name not in self.environment.tests:
-            self.fail('no test named %r' % node.name, node.lineno)
-        self.visit(node.node, frame)
-        self.signature(node, frame)
-        self.write(')')
-
-    def visit_CondExpr(self, node, frame):
-        def write_expr2():
-            if node.expr2 is not None:
-                return self.visit(node.expr2, frame)
-            self.write('environment.undefined(%r)' % ('the inline if-'
-                       'expression on %s evaluated to false and '
-                       'no else section was defined.' % self.position(node)))
-
-        self.write('(')
-        self.visit(node.expr1, frame)
-        self.write(' if ')
-        self.visit(node.test, frame)
-        self.write(' else ')
-        write_expr2()
-        self.write(')')
-
-    def visit_Call(self, node, frame, forward_caller=False):
-        if self.environment.sandboxed:
-            self.write('environment.call(context, ')
-        else:
-            self.write('context.call(')
-        self.visit(node.node, frame)
-        extra_kwargs = forward_caller and {'caller': 'caller'} or None
-        self.signature(node, frame, extra_kwargs)
-        self.write(')')
-
-    def visit_Keyword(self, node, frame):
-        self.write(node.key + '=')
-        self.visit(node.value, frame)
-
-    # -- Unused nodes for extensions
-
-    def visit_MarkSafe(self, node, frame):
-        self.write('Markup(')
-        self.visit(node.expr, frame)
-        self.write(')')
-
-    def visit_MarkSafeIfAutoescape(self, node, frame):
-        self.write('(context.eval_ctx.autoescape and Markup or identity)(')
-        self.visit(node.expr, frame)
-        self.write(')')
-
-    def visit_EnvironmentAttribute(self, node, frame):
-        self.write('environment.' + node.name)
-
-    def visit_ExtensionAttribute(self, node, frame):
-        self.write('environment.extensions[%r].%s' % (node.identifier, node.name))
-
-    def visit_ImportedName(self, node, frame):
-        self.write(self.import_aliases[node.importname])
-
-    def visit_InternalName(self, node, frame):
-        self.write(node.name)
-
-    def visit_ContextReference(self, node, frame):
-        self.write('context')
-
-    def visit_Continue(self, node, frame):
-        self.writeline('continue', node)
-
-    def visit_Break(self, node, frame):
-        self.writeline('break', node)
-
-    def visit_Scope(self, node, frame):
-        scope_frame = frame.inner()
-        scope_frame.inspect(node.iter_child_nodes())
-        aliases = self.push_scope(scope_frame)
-        self.pull_locals(scope_frame)
-        self.blockvisit(node.body, scope_frame)
-        self.pop_scope(aliases, scope_frame)
-
-    def visit_EvalContextModifier(self, node, frame):
-        for keyword in node.options:
-            self.writeline('context.eval_ctx.%s = ' % keyword.key)
-            self.visit(keyword.value, frame)
-            try:
-                val = keyword.value.as_const(frame.eval_ctx)
-            except nodes.Impossible:
-                frame.eval_ctx.volatile = True
-            else:
-                setattr(frame.eval_ctx, keyword.key, val)
-
-    def visit_ScopedEvalContextModifier(self, node, frame):
-        old_ctx_name = self.temporary_identifier()
-        safed_ctx = frame.eval_ctx.save()
-        self.writeline('%s = context.eval_ctx.save()' % old_ctx_name)
-        self.visit_EvalContextModifier(node, frame)
-        for child in node.body:
-            self.visit(child, frame)
-        frame.eval_ctx.revert(safed_ctx)
-        self.writeline('context.eval_ctx.revert(%s)' % old_ctx_name)