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$ ˆl–Ým_J22Ž¥@µq§n6%1hßÆ „qÁ<×Å¿Ã ?÷ # -*- coding: utf-8 -*- """Compiles nodes from the parser into Python code.""" from collections import namedtuple from functools import update_wrapper from itertools import chain from keyword import iskeyword as is_python_keyword from markupsafe import escape from markupsafe import Markup from . import nodes from ._compat import imap from ._compat import iteritems from ._compat import izip from ._compat import NativeStringIO from ._compat import range_type from ._compat import string_types from ._compat import text_type from .exceptions import TemplateAssertionError from .idtracking import Symbols from .idtracking import VAR_LOAD_ALIAS from .idtracking import VAR_LOAD_PARAMETER from .idtracking import VAR_LOAD_RESOLVE from .idtracking import VAR_LOAD_UNDEFINED from .nodes import EvalContext from .optimizer import Optimizer from .utils import concat from .visitor import NodeVisitor 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) exce