| # -*- 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) |
