compiler.py 文件源码

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(')')