diff options
Diffstat (limited to 'lib/python2.7/site-packages/Jinja2-2.6-py2.7.egg/jinja2/compiler.py')
| -rwxr-xr-x | lib/python2.7/site-packages/Jinja2-2.6-py2.7.egg/jinja2/compiler.py | 1649 |
1 files changed, 0 insertions, 1649 deletions
diff --git a/lib/python2.7/site-packages/Jinja2-2.6-py2.7.egg/jinja2/compiler.py b/lib/python2.7/site-packages/Jinja2-2.6-py2.7.egg/jinja2/compiler.py deleted file mode 100755 index b21cb386..00000000 --- a/lib/python2.7/site-packages/Jinja2-2.6-py2.7.egg/jinja2/compiler.py +++ /dev/null @@ -1,1649 +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 cStringIO import StringIO -from itertools import chain -from copy import deepcopy -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, is_python_keyword, next - - -operators = { - 'eq': '==', - 'ne': '!=', - 'gt': '>', - 'gteq': '>=', - 'lt': '<', - 'lteq': '<=', - 'in': 'in', - 'notin': 'not in' -} - -try: - exec '(0 if 0 else 0)' -except SyntaxError: - have_condexpr = False -else: - have_condexpr = True - - -# 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 -unoptimize_before_dead_code = bool(unoptimize_before_dead_code().func_closure) - - -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, long, float, complex, basestring, - xrange, Markup)): - 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 value.iteritems(): - 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 = StringIO() - 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 extra_kwargs.iteritems(): - 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 extra_kwargs.iteritems(): - 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 aliases.iteritems(): - 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 - overriden_closure_vars = ( - func_frame.identifiers.undeclared & - func_frame.identifiers.declared & - (func_frame.identifiers.declared_locally | - func_frame.identifiers.declared_parameter) - ) - if overriden_closure_vars: - self.fail('It\'s not possible to set and access variables ' - 'derived from an outer scope! (affects: %s)' % - ', '.join(sorted(overriden_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 self.blocks.iteritems(): - 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') - self.outdent() - - # 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() - - 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, basestring): - 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(map(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):', 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: - 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(', recurse=loop_render_func):') - 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: unicode(self.environment.finalize(x)) - else: - finalize = unicode - - # 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(map(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))) - - if not have_condexpr: - self.write('((') - self.visit(node.test, frame) - self.write(') and (') - self.visit(node.expr1, frame) - self.write(',) or (') - write_expr2() - self.write(',))[0]') - else: - 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) |