frontmatter.py 文件源码

def apply(self):
        if getattr(self.document.settings, 'doctitle_xform', 1):
            # promote_(sub)title defined in TitlePromoter base class.
            if self.promote_title(self.document):
                # If a title has been promoted, also try to promote a
                # subtitle.
                self.promote_subtitle(self.document)
        # Set document['title'].
        self.set_metadata()