meta.py 文件源码

def run(self, lines):
        """ Parse Meta-Data and store in Markdown.Meta. """
        meta = {}
        key = None
        yaml_block = []
        have_yaml = False
        if lines and YAML_BEGIN_RE.match(lines[0]):
            have_yaml = True
            lines.pop(0)
            if self.config['yaml'] and not yaml:  # pragma: no cover
                log.warning('Document with YAML header, but PyYAML unavailable')
        while lines:
            line = lines.pop(0)
            m1 = META_RE.match(line)
            if line.strip() == '' or have_yaml and YAML_END_RE.match(line):
                break  # blank line or end of YAML header - done
            elif have_yaml and self.config['yaml'] and yaml:
                yaml_block.append(line)
            elif m1:
                key = m1.group('key').lower().strip()
                value = m1.group('value').strip()
                try:
                    meta[key].append(value)
                except KeyError:
                    meta[key] = [value]
            else:
                m2 = META_MORE_RE.match(line)
                if m2 and key:
                    # Add another line to existing key
                    meta[key].append(m2.group('value').strip())
                else:
                    lines.insert(0, line)
                    break  # no meta data - done
        if yaml_block:
            meta = yaml.load('\n'.join(yaml_block), SafeLoader)
        self.markdown.Meta = meta
        return lines