jinja_extensions.py 文件源码

def parse(self, parser):
        lineno = next(parser.stream).lineno
        node = nodes.Extends(lineno)
        template_path = parser.filename
        # find where in the search path this template is from
        index = 0
        if not hasattr(self, 'searchpath'):
            return node
        for searchpath in self.searchpath:
            if template_path.startswith(searchpath):
                break
            index += 1

        # get filename from full path
        filename = template_path[len(searchpath) + 1:]

        # Providing template path violently deprecated
        if parser.stream.current.type != 'block_end':
            provided_template = parser.parse_expression().value
            if provided_template != filename:
                raise Exception('ckan_extends tag wrong path %s in %s'
                                % (provided_template, template_path))
            else:
                log.critical('Remove path from ckan_extend tag in %s'
                             % template_path)

        # provide our magic format
        # format is *<search path parent index>*<template name>
        magic_filename = '*' + str(index) + '*' + filename
        # set template
        node.template = nodes.Const(magic_filename)
        return node