#6 — Fixing crossreference on importing BibTex

Currently, importing references with tools/parsers/bibtex.py does not support cross-references. Adding the following to the class BibtexParser might fix it. It's not very elegant, but it works.

    def getEntries(self, source):
        """Overrides the base function as we also sort out the crossreferences here.
        """
        entries = BibliographyParser.getEntries(self, source)
        return self.substituteCrossrefs(entries)

    def substituteCrossrefs(self, entries):
        """If an entry contains the field 'crossref', then the items of the
        entry references to are added to the original entry, and the field
        'crossref' is removed.
        """
        for entry in entries:
            # ignore entries without crossreferences
            if not entry.has_key('crossref'):
                continue
            crossref = entry['crossref']
            # find the entry that the crossreference refers to
            crossref_entry = None
            for ref_entry in entries:
                if ref_entry['pid'] == crossref:
                    crossref_entry = ref_entry
                    break
            # ignore no reference or self-reference
            if not crossref_entry or crossref_entry == entry:
                continue
            # add all values of the crossref for which there is no item
            # in the current entry, or the item is empty.
            for k, v in crossref_entry.items():
                if not entry.get(k, None):
                    entry[k] = v
            # remove the cross reference
            del entry['crossref']
        return entries