frontmatter.py 文件源码

def extract_bibliographic(self, field_list):
        docinfo = nodes.docinfo()
        bibliofields = self.language.bibliographic_fields
        labels = self.language.labels
        topics = {'dedication': None, 'abstract': None}
        for field in field_list:
            try:
                name = field[0][0].astext()
                normedname = nodes.make_id(name)
                if not (len(field) == 2 and normedname in bibliofields
                        and self.check_empty_biblio_field(field, name)):
                    raise TransformError
                canonical = bibliofields[normedname]
                biblioclass = self.biblio_nodes[canonical]
                if issubclass(biblioclass, nodes.TextElement):
                    if not self.check_compound_biblio_field(field, name):
                        raise TransformError
                    utils.clean_rcs_keywords(
                          field[1][0], self.rcs_keyword_substitutions)
                    docinfo.append(biblioclass('', '', *field[1][0]))
                elif issubclass(biblioclass, nodes.authors):
                    self.extract_authors(field, name, docinfo)
                elif issubclass(biblioclass, nodes.topic):
                    if topics[canonical]:
                        field[-1] += self.document.reporter.warning(
                            'There can only be one "%s" field.' % name,
                            base_node=field)
                        raise TransformError
                    title = nodes.title(name, labels[canonical])
                    topics[canonical] = biblioclass(
                        '', title, classes=[canonical], *field[1].children)
                else:
                    docinfo.append(biblioclass('', *field[1].children))
            except TransformError:
                if len(field[-1]) == 1 \
                       and isinstance(field[-1][0], nodes.paragraph):
                    utils.clean_rcs_keywords(
                        field[-1][0], self.rcs_keyword_substitutions)
                if normedname and normedname not in bibliofields:
                    field['classes'].append(normedname)
                docinfo.append(field)
        nodelist = []
        if len(docinfo) != 0:
            nodelist.append(docinfo)
        for name in ('dedication', 'abstract'):
            if topics[name]:
                nodelist.append(topics[name])
        return nodelist