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# -- coding: utf-8 -- """ jinja2.compiler ~~~~~~~~~~~~~~~ Compiles nodes into python code. :copyright: (c) 2017 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 functools import update_wrapper from jinja2 import nodes from jinja2.nodes import EvalContext from jinja2.visitor import NodeVisitor from jinja2.optimizer import Optimizer from jinja2.exceptions import TemplateAssertionError from jinja2.utils import Markup, concat, escape from jinja2._compat import range_type, text_type, string_types, \ iteritems, NativeStringIO, imap, izip from jinja2.idtracking import Symbols, VAR_LOAD_PARAMETER, \ VAR_LOAD_RESOLVE, VAR_LOAD_ALIAS, VAR_LOAD_UNDEFINED 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' code_features = ['division'] # does this python version support generator stops? (PEP 0479) try: exec('from __future__ import generator_stop') code_features.append('generator_stop') except SyntaxError: pass # does this python version support yield from? try: exec('def f(): yield from x()') except SyntaxError: supports_yield_from = False else: supports_yield_from = True def optimizeconst(f): def new_func(self, node, frame, kwargs): # Only optimize if the frame is not volatile if self.optimized and not frame.eval_ctx.volatile: new_node = self.optimizer.visit(node, frame.eval_ctx) if new_node != node: return self.visit(new_node, frame) return f(self, node, frame, kwargs) return update_wrapper(new_func, f) def generate(node, environment, name, filename, stream=None, defer_init=False, optimized=True): """Generate the python source for a node tree.""" if not isinstance(node, nodes.Template): raise TypeError('Can\'t compile non template nodes') generator = environment.code_generator_class(environment, name, filename, stream, defer_init, optimized) 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 type(value) in (bool, int, float, complex, range_type, Markup) + string_types: return True if type(value) in (tuple, list, set, frozenset): for item in value: if not has_safe_repr(item): return False return True elif type(value) is 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 MacroRef(object): def __init__(self, node): self.node = node self.accesses_caller = False self.accesses_kwargs = False self.accesses_varargs = False class Frame(object): """Holds compile time information for us.""" def __init__(self, eval_ctx, parent=None, level=None): self.eval_ctx = eval_ctx self.symbols = Symbols(parent and parent.symbols or None, level=level) # 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 # the parent of this frame self.parent = parent if parent is not None: 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.symbols = self.symbols.copy() return rv def inner(self, isolated=False): """Return an inner frame.""" if isolated: return Frame(self.eval_ctx, level=self.symbols.level + 1) 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. This is only used to implement if-statements. """ 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 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, optimized=True): 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 self.optimized = optimized if optimized: self.optimizer = Optimizer(environment) # 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 # Tracks toplevel assignments self._assign_stack = [] # Tracks parameter definition blocks self._param_def_block = [] # Tracks the current context. self._context_reference_stack = ['context'] # -- 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, force_unescaped=False): """Return the buffer contents of the frame.""" if not force_unescaped: 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() return elif frame.eval_ctx.autoescape: self.writeline('return Markup(concat(%s))' % frame.buffer) return 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. """ try: self.writeline('pass') 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_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 enter_frame(self, frame): undefs = [] for target, (action, param) in iteritems(frame.symbols.loads): if action == VAR_LOAD_PARAMETER: pass elif action == VAR_LOAD_RESOLVE: self.writeline('%s = %s(%r)' % (target, self.get_resolve_func(), param)) elif action == VAR_LOAD_ALIAS: self.writeline('%s = %s' % (target, param)) elif action == VAR_LOAD_UNDEFINED: undefs.append(target) else: raise NotImplementedError('unknown load instruction') if undefs: self.writeline('%s = missing' % ' = '.join(undefs)) def leave_frame(self, frame, with_python_scope=False): if not with_python_scope: undefs = [] for target, _ in iteritems(frame.symbols.loads): undefs.append(target) if undefs: self.writeline('%s = missing' % ' = '.join(undefs)) def func(self, name): if self.environment.is_async: return 'async def %s' % name return 'def %s' % name def macro_body(self, node, frame): """Dump the function def of a macro or call block.""" frame = frame.inner() frame.symbols.analyze_node(node) macro_ref = MacroRef(node) explicit_caller = None skip_special_params = set() args = [] for idx, arg in enumerate(node.args): if arg.name == 'caller': explicit_caller = idx if arg.name in ('kwargs', 'varargs'): skip_special_params.add(arg.name) args.append(frame.symbols.ref(arg.name)) undeclared = find_undeclared(node.body, ('caller', 'kwargs', 'varargs')) if 'caller' in undeclared: # In older Jinja2 versions there was a bug that allowed caller # to retain the special behavior even if it was mentioned in # the argument list. However thankfully this was only really # working if it was the last argument. So we are explicitly # checking this now and error out if it is anywhere else in # the argument list. if explicit_caller is not None: try: node.defaults[explicit_caller - len(node.args)] except IndexError: self.fail('When defining macros or call blocks the ' 'special "caller" argument must be omitted ' 'or be given a default.', node.lineno) else: args.append(frame.symbols.declare_parameter('caller')) macro_ref.accesses_caller = True if 'kwargs' in undeclared and not 'kwargs' in skip_special_params: args.append(frame.symbols.declare_parameter('kwargs')) macro_ref.accesses_kwargs = True if 'varargs' in undeclared and not 'varargs' in skip_special_params: args.append(frame.symbols.declare_parameter('varargs')) macro_ref.accesses_varargs = True # macros are delayed, they never require output checks frame.require_output_check = False frame.symbols.analyze_node(node) self.writeline('%s(%s):' % (self.func('macro'), ', '.join(args)), node) self.indent() self.buffer(frame) self.enter_frame(frame) self.push_parameter_definitions(frame) for idx, arg in enumerate(node.args): ref = frame.symbols.ref(arg.name) self.writeline('if %s is missing:' % ref) self.indent() try: default = node.defaults[idx - len(node.args)] except IndexError: self.writeline('%s = undefined(%r, name=%r)' % ( ref, 'parameter %r was not provided' % arg.name, arg.name)) else: self.writeline('%s = ' % ref) self.visit(default, frame) self.mark_parameter_stored(ref) self.outdent() self.pop_parameter_definitions() self.blockvisit(node.body, frame) self.return_buffer_contents(frame, force_unescaped=True) self.leave_frame(frame, with_python_scope=True) self.outdent() return frame, macro_ref def macro_def(self, macro_ref, frame): """Dump the macro definition for the def created by macro_body.""" arg_tuple = ', '.join(repr(x.name) for x in macro_ref.node.args) name = getattr(macro_ref.node, 'name', None) if len(macro_ref.node.args) == 1: arg_tuple += ',' self.write('Macro(environment, macro, %r, (%s), %r, %r, %r, ' 'context.eval_ctx.autoescape)' % (name, arg_tuple, macro_ref.accesses_kwargs, macro_ref.accesses_varargs, macro_ref.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 def dump_local_context(self, frame): return '{%s}' % ', '.join( '%r: %s' % (name, target) for name, target in iteritems(frame.symbols.dump_stores())) def write_commons(self): """Writes a common preamble that is used by root and block functions. Primarily this sets up common local helpers and enforces a generator through a dead branch. """ self.writeline('resolve = context.resolve_or_missing') self.writeline('undefined = environment.undefined') self.writeline('if 0: yield None') def push_parameter_definitions(self, frame): """Pushes all parameter targets from the given frame into a local stack that permits tracking of yet to be assigned parameters. In particular this enables the optimization from `visit_Name` to skip undefined expressions for parameters in macros as macros can reference otherwise unbound parameters. """ self._param_def_block.append(frame.symbols.dump_param_targets()) def pop_parameter_definitions(self): """Pops the current parameter definitions set.""" self._param_def_block.pop() def mark_parameter_stored(self, target): """Marks a parameter in the current parameter definitions as stored. This will skip the enforced undefined checks. """ if self._param_def_block: self._param_def_block[-1].discard(target) def push_context_reference(self, target): self._context_reference_stack.append(target) def pop_context_reference(self): self._context_reference_stack.pop() def get_context_ref(self): return self._context_reference_stack[-1] def get_resolve_func(self): target = self._context_reference_stack[-1] if target == 'context': return 'resolve' return '%s.resolve' % target def derive_context(self, frame): return '%s.derived(%s)' % ( self.get_context_ref(), self.dump_local_context(frame), ) def parameter_is_undeclared(self, target): """Checks if a given target is an undeclared parameter.""" if not self._param_def_block: return False return target in self._param_def_block[-1] def push_assign_tracking(self): """Pushes a new layer for assignment tracking.""" self._assign_stack.append(set()) def pop_assign_tracking(self, frame): """Pops the topmost level for assignment tracking and updates the context variables if necessary. """ vars = self._assign_stack.pop() if not frame.toplevel or not vars: return public_names = [x for x in vars if x[:1] != '_'] if len(vars) == 1: name = next(iter(vars)) ref = frame.symbols.ref(name) self.writeline('context.vars[%r] = %s' % (name, ref)) else: self.writeline('context.vars.update({') for idx, name in enumerate(vars): if idx: self.write(', ') ref = frame.symbols.ref(name) self.write('%r: %s' % (name, ref)) 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))) # -- 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 %s' % ', '.join(code_features)) self.writeline('from jinja2.runtime import ' + ', '.join(exported)) if self.environment.is_async: self.writeline('from jinja2.asyncsupport import auto_await, ' 'auto_aiter, make_async_loop_context') # 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('%s(context, missing=missing%s):' % (self.func('root'), envenv), extra=1) self.indent() self.write_commons() # process the root frame = Frame(eval_ctx) if 'self' in find_undeclared(node.body, ('self',)): ref = frame.symbols.declare_parameter('self') self.writeline('%s = TemplateReference(context)' % ref) frame.symbols.analyze_node(node) frame.toplevel = frame.rootlevel = True frame.require_output_check = have_extends and not self.has_known_extends if have_extends: self.writeline('parent_template = None') self.enter_frame(frame) self.pull_dependencies(node.body) self.blockvisit(node.body, frame) self.leave_frame(frame, with_python_scope=True) 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() if supports_yield_from and not self.environment.is_async: self.writeline('yield from parent_template.' 'root_render_func(context)') else: self.writeline('%sfor event in parent_template.' 'root_render_func(context):' % (self.environment.is_async and 'async ' or '')) self.indent() self.writeline('yield event') self.outdent() self.outdent(1 + (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): self.writeline('%s(context, missing=missing%s):' % (self.func('block_' + name), envenv), block, 1) self.indent() self.write_commons() # It's important that we do not make this frame a child of the # toplevel template. This would cause a variety of # interesting issues with identifier tracking. block_frame = Frame(eval_ctx) undeclared = find_undeclared(block.body, ('self', 'super')) if 'self' in undeclared: ref = block_frame.symbols.declare_parameter('self') self.writeline('%s = TemplateReference(context)' % ref) if 'super' in undeclared: ref = block_frame.symbols.declare_parameter('super') self.writeline('%s = context.super(%r, ' 'block_%s)' % (ref, name, name)) block_frame.symbols.analyze_node(block) block_frame.block = name self.enter_frame(block_frame) self.pull_dependencies(block.body) self.blockvisit(block.body, block_frame) self.leave_frame(block_frame, with_python_scope=True) 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 = 0 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 if node.scoped: context = self.derive_context(frame) else: context = self.get_context_ref() if supports_yield_from and not self.environment.is_async and \ frame.buffer is None: self.writeline('yield from context.blocks[%r][0](%s)' % ( node.name, context), node) else: loop = self.environment.is_async and 'async for' or 'for' self.writeline('%s event in context.blocks[%r][0](%s):' % ( loop, node.name, context), node) self.indent() self.simple_write('event', frame) self.outdent() 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.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() skip_event_yield = False if node.with_context: loop = self.environment.is_async and 'async for' or 'for' self.writeline('%s event in template.root_render_func(' 'template.new_context(context.get_all(), True, ' '%s)):' % (loop, self.dump_local_context(frame))) elif self.environment.is_async: self.writeline('for event in (await ' 'template._get_default_module_async())' '._body_stream:') else: if supports_yield_from: self.writeline('yield from template._get_default_module()' '._body_stream') skip_event_yield = True else: self.writeline('for event in template._get_default_module()' '._body_stream:') if not skip_event_yield: self.indent() self.simple_write('event', frame) self.outdent() if node.ignore_missing: self.outdent() def visit_Import(self, node, frame): """Visit regular imports.""" self.writeline('%s = ' % frame.symbols.ref(node.target), node) if frame.toplevel: self.write('context.vars[%r] = ' % node.target) if self.environment.is_async: self.write('await ') self.write('environment.get_template(') self.visit(node.template, frame) self.write(', %r).' % self.name) if node.with_context: self.write('make_module%s(context.get_all(), True, %s)' % (self.environment.is_async and '_async' or '', self.dump_local_context(frame))) elif self.environment.is_async: self.write('_get_default_module_async()') else: self.write('_get_default_module()') if frame.toplevel and not node.target.startswith('_'): self.writeline('context.exported_vars.discard(%r)' % node.target) def visit_FromImport(self, node, frame): """Visit named imports.""" self.newline(node) self.write('included_template = %senvironment.get_template(' % (self.environment.is_async and 'await ' or '')) self.visit(node.template, frame) self.write(', %r).' % self.name) if node.with_context: self.write('make_module%s(context.get_all(), True, %s)' % (self.environment.is_async and '_async' or '', self.dump_local_context(frame))) elif self.environment.is_async: self.write('_get_default_module_async()') else: self.write('_get_default_module()') var_names = [] discarded_names = [] for name in node.names: if isinstance(name, tuple): name, alias = name else: alias = name self.writeline('%s = getattr(included_template, ' '%r, missing)' % (frame.symbols.ref(alias), name)) self.writeline('if %s is missing:' % frame.symbols.ref(alias)) self.indent() self.writeline('%s = undefined(%r %% ' 'included_template.__name__, ' 'name=%r)' % (frame.symbols.ref(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) if var_names: if len(var_names) == 1: name = var_names[0] self.writeline('context.vars[%r] = %s' % (name, frame.symbols.ref(name))) else: self.writeline('context.vars.update({%s})' % ', '.join( '%r: %s' % (name, frame.symbols.ref(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): loop_frame = frame.inner() test_frame = frame.inner() else_frame = frame.inner() # 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',)) loop_ref = None if extended_loop: loop_ref = loop_frame.symbols.declare_parameter('loop') loop_frame.symbols.analyze_node(node, for_branch='body') if node.else_: else_frame.symbols.analyze_node(node, for_branch='else') if node.test: loop_filter_func = self.temporary_identifier() test_frame.symbols.analyze_node(node, for_branch='test') self.writeline('%s(fiter):' % self.func(loop_filter_func), node.test) self.indent() self.enter_frame(test_frame) self.writeline(self.environment.is_async and 'async for ' or 'for ') self.visit(node.target, loop_frame) self.write(' in ') self.write(self.environment.is_async and 'auto_aiter(fiter)' or 'fiter') self.write(':') self.indent() self.writeline('if ', node.test) self.visit(node.test, test_frame) self.write(':') self.indent() self.writeline('yield ') self.visit(node.target, loop_frame) self.outdent(3) self.leave_frame(test_frame, with_python_scope=True) # 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 node.recursive: self.writeline('%s(reciter, loop_render_func, depth=0):' % self.func('loop'), node) self.indent() self.buffer(loop_frame) # Use the same buffer for the else frame else_frame.buffer = loop_frame.buffer # 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('%s = missing' % loop_ref) 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) if node.else_: iteration_indicator = self.temporary_identifier() self.writeline('%s = 1' % iteration_indicator) self.writeline(self.environment.is_async and 'async for ' or 'for ', node) self.visit(node.target, loop_frame) if extended_loop: if self.environment.is_async: self.write(', %s in await make_async_loop_context(' % loop_ref) else: self.write(', %s in LoopContext(' % loop_ref) else: self.write(' in ') if node.test: self.write('%s(' % loop_filter_func) if node.recursive: self.write('reciter') else: if self.environment.is_async and not extended_loop: self.write('auto_aiter(') self.visit(node.iter, frame) if self.environment.is_async and not extended_loop: self.write(')') if node.test: self.write(')') if node.recursive: self.write(', undefined, loop_render_func, depth):') else: self.write(extended_loop and ', undefined):' or ':') self.indent() self.enter_frame(loop_frame) self.blockvisit(node.body, loop_frame) if node.else_: self.writeline('%s = 0' % iteration_indicator) self.outdent() self.leave_frame(loop_frame, with_python_scope=node.recursive and not node.else_) if node.else_: self.writeline('if %s:' % iteration_indicator) self.indent() self.enter_frame(else_frame) self.blockvisit(node.else_, else_frame) self.leave_frame(else_frame) self.outdent() # 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) if self.environment.is_async: self.write('await ') self.write('loop(') if self.environment.is_async: self.write('auto_aiter(') self.visit(node.iter, frame) if self.environment.is_async: self.write(')') 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() for elif_ in node.elif_: self.writeline('elif ', elif_) self.visit(elif_.test, if_frame) self.write(':') self.indent() self.blockvisit(elif_.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, macro_ref = self.macro_body(node, frame) self.newline() if frame.toplevel: if not node.name.startswith('_'): self.write('context.exported_vars.add(%r)' % node.name) ref = frame.symbols.ref(node.name) self.writeline('context.vars[%r] = ' % node.name) self.write('%s = ' % frame.symbols.ref(node.name)) self.macro_def(macro_ref, macro_frame) def visit_CallBlock(self, node, frame): call_frame, macro_ref = self.macro_body(node, frame) self.writeline('caller = ') self.macro_def(macro_ref, call_frame) self.start_write(frame, node) self.visit_Call(node.call, frame, forward_caller=True) self.end_write(frame) def visit_FilterBlock(self, node, frame): filter_frame = frame.inner() filter_frame.symbols.analyze_node(node) self.enter_frame(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.leave_frame(filter_frame) def visit_With(self, node, frame): with_frame = frame.inner() with_frame.symbols.analyze_node(node) self.enter_frame(with_frame) for idx, (target, expr) in enumerate(izip(node.targets, node.values)): self.newline() self.visit(target, with_frame) self.write(' = ') self.visit(expr, frame) self.blockvisit(node.body, with_frame) self.leave_frame(with_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 allow_constant_finalize = True if self.environment.finalize: func = self.environment.finalize if getattr(func, 'contextfunction', False) or \ getattr(func, 'evalcontextfunction', False): allow_constant_finalize = False elif getattr(func, 'environmentfunction', False): finalize = lambda x: text_type( self.environment.finalize(self.environment, x)) else: 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: if not allow_constant_finalize: raise nodes.Impossible() 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('(escape if context.eval_ctx.autoescape' ' else 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(') if getattr(self.environment.finalize, "contextfunction", False): self.write('context, ') 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)) + ' % (') self.indent() for argument in arguments: self.newline(argument) close = 0 if frame.eval_ctx.volatile: self.write('(escape if context.eval_ctx.autoescape else' ' 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(') if getattr(self.environment.finalize, 'contextfunction', False): self.write('context, ') elif getattr(self.environment.finalize, 'evalcontextfunction', False): self.write('context.eval_ctx, ') elif getattr(self.environment.finalize, 'environmentfunction', False): self.write('environment, ') 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.push_assign_tracking() self.newline(node) self.visit(node.target, frame) self.write(' = ') self.visit(node.node, frame) self.pop_assign_tracking(frame) def visit_AssignBlock(self, node, frame): self.push_assign_tracking() block_frame = frame.inner() # This is a special case. Since a set block always captures we # will disable output checks. This way one can use set blocks # toplevel even in extended templates. block_frame.require_output_check = False block_frame.symbols.analyze_node(node) self.enter_frame(block_frame) self.buffer(block_frame) self.blockvisit(node.body, block_frame) self.newline(node) self.visit(node.target, frame) self.write(' = (Markup if context.eval_ctx.autoescape ' 'else identity)(') if node.filter is not None: self.visit_Filter(node.filter, block_frame) else: self.write('concat(%s)' % block_frame.buffer) self.write(')') self.pop_assign_tracking(frame) self.leave_frame(block_frame) # -- Expression Visitors def visit_Name(self, node, frame): if node.ctx == 'store' and frame.toplevel: if self._assign_stack: self._assign_stack[-1].add(node.name) ref = frame.symbols.ref(node.name) # If we are looking up a variable we might have to deal with the # case where it's undefined. We can skip that case if the load # instruction indicates a parameter which are always defined. if node.ctx == 'load': load = frame.symbols.find_load(ref) if not (load is not None and load[0] == VAR_LOAD_PARAMETER and \ not self.parameter_is_undeclared(ref)): self.write('(undefined(name=%r) if %s is missing else %s)' % (node.name, ref, ref)) return self.write(ref) def visit_NSRef(self, node, frame): # NSRefs can only be used to store values; since they use the normal # `foo.bar` notation they will be parsed as a normal attribute access # when used anywhere but in a `set` context ref = frame.symbols.ref(node.name) self.writeline('if not isinstance(%s, Namespace):' % ref) self.indent() self.writeline('raise TemplateRuntimeError(%r)' % 'cannot assign attribute on non-namespace object') self.outdent() self.writeline('%s[%r]' % (ref, node.attr)) def visit_Const(self, node, frame): val = node.as_const(frame.eval_ctx) 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('(Markup if context.eval_ctx.autoescape else 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): @optimizeconst 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): @optimizeconst 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 @optimizeconst 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('))') @optimizeconst 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) @optimizeconst def visit_Getattr(self, node, frame): self.write('environment.getattr(') self.visit(node.node, frame) self.write(', %r)' % node.attr) @optimizeconst 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) @optimizeconst def visit_Filter(self, node, frame): if self.environment.is_async: self.write('await auto_await(') 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(')') if self.environment.is_async: self.write(')') @optimizeconst 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(')') @optimizeconst def visit_CondExpr(self, node, frame): def write_expr2(): if node.expr2 is not None: return self.visit(node.expr2, frame) self.write('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(')') @optimizeconst def visit_Call(self, node, frame, forward_caller=False): if self.environment.is_async: self.write('await auto_await(') 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(')') if self.environment.is_async: 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.symbols.analyze_node(node) self.enter_frame(scope_frame) self.blockvisit(node.body, scope_frame) self.leave_frame(scope_frame) def visit_OverlayScope(self, node, frame): ctx = self.temporary_identifier() self.writeline('%s = %s' % (ctx, self.derive_context(frame))) self.writeline('%s.vars = ' % ctx) self.visit(node.context, frame) self.push_context_reference(ctx) scope_frame = frame.inner(isolated=True) scope_frame.symbols.analyze_node(node) self.enter_frame(scope_frame) self.blockvisit(node.body, scope_frame) self.leave_frame(scope_frame) self.pop_context_reference() 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() saved_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(saved_ctx) self.writeline('context.eval_ctx.revert(%s)' % old_ctx_name)

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