| # $Id: frontmatter.py 5618 2008-07-28 08:37:32Z strank $ |
| # Author: David Goodger, Ueli Schlaepfer <[email protected]> |
| # Copyright: This module has been placed in the public domain. |
| |
| """ |
| Transforms related to the front matter of a document or a section |
| (information found before the main text): |
| |
| - `DocTitle`: Used to transform a lone top level section's title to |
| the document title, promote a remaining lone top-level section's |
| title to the document subtitle, and determine the document's title |
| metadata (document['title']) based on the document title and/or the |
| "title" setting. |
| |
| - `SectionSubTitle`: Used to transform a lone subsection into a |
| subtitle. |
| |
| - `DocInfo`: Used to transform a bibliographic field list into docinfo |
| elements. |
| """ |
| |
| __docformat__ = 'reStructuredText' |
| |
| import re |
| from docutils import nodes, utils |
| from docutils.transforms import TransformError, Transform |
| |
| |
| class TitlePromoter(Transform): |
| |
| """ |
| Abstract base class for DocTitle and SectionSubTitle transforms. |
| """ |
| |
| def promote_title(self, node): |
| """ |
| Transform the following tree:: |
| |
| <node> |
| <section> |
| <title> |
| ... |
| |
| into :: |
| |
| <node> |
| <title> |
| ... |
| |
| `node` is normally a document. |
| """ |
| # `node` must not have a title yet. |
| assert not (len(node) and isinstance(node[0], nodes.title)) |
| section, index = self.candidate_index(node) |
| if index is None: |
| return None |
| # Transfer the section's attributes to the node: |
| node.attributes.update(section.attributes) |
| # setup_child is called automatically for all nodes. |
| node[:] = (section[:1] # section title |
| + node[:index] # everything that was in the |
| # node before the section |
| + section[1:]) # everything that was in the section |
| assert isinstance(node[0], nodes.title) |
| return 1 |
| |
| def promote_subtitle(self, node): |
| """ |
| Transform the following node tree:: |
| |
| <node> |
| <title> |
| <section> |
| <title> |
| ... |
| |
| into :: |
| |
| <node> |
| <title> |
| <subtitle> |
| ... |
| """ |
| subsection, index = self.candidate_index(node) |
| if index is None: |
| return None |
| subtitle = nodes.subtitle() |
| # Transfer the subsection's attributes to the new subtitle: |
| # This causes trouble with list attributes! To do: Write a |
| # test case which catches direct access to the `attributes` |
| # dictionary and/or write a test case which shows problems in |
| # this particular case. |
| subtitle.attributes.update(subsection.attributes) |
| # We're losing the subtitle's attributes here! To do: Write a |
| # test case which shows this behavior. |
| # Transfer the contents of the subsection's title to the |
| # subtitle: |
| subtitle[:] = subsection[0][:] |
| node[:] = (node[:1] # title |
| + [subtitle] |
| # everything that was before the section: |
| + node[1:index] |
| # everything that was in the subsection: |
| + subsection[1:]) |
| return 1 |
| |
| def candidate_index(self, node): |
| """ |
| Find and return the promotion candidate and its index. |
| |
| Return (None, None) if no valid candidate was found. |
| """ |
| index = node.first_child_not_matching_class( |
| nodes.PreBibliographic) |
| if index is None or len(node) > (index + 1) or \ |
| not isinstance(node[index], nodes.section): |
| return None, None |
| else: |
| return node[index], index |
| |
| |
| class DocTitle(TitlePromoter): |
| |
| """ |
| In reStructuredText_, there is no way to specify a document title |
| and subtitle explicitly. Instead, we can supply the document title |
| (and possibly the subtitle as well) implicitly, and use this |
| two-step transform to "raise" or "promote" the title(s) (and their |
| corresponding section contents) to the document level. |
| |
| 1. If the document contains a single top-level section as its |
| first non-comment element, the top-level section's title |
| becomes the document's title, and the top-level section's |
| contents become the document's immediate contents. The lone |
| top-level section header must be the first non-comment element |
| in the document. |
| |
| For example, take this input text:: |
| |
| ================= |
| Top-Level Title |
| ================= |
| |
| A paragraph. |
| |
| Once parsed, it looks like this:: |
| |
| <document> |
| <section names="top-level title"> |
| <title> |
| Top-Level Title |
| <paragraph> |
| A paragraph. |
| |
| After running the DocTitle transform, we have:: |
| |
| <document names="top-level title"> |
| <title> |
| Top-Level Title |
| <paragraph> |
| A paragraph. |
| |
| 2. If step 1 successfully determines the document title, we |
| continue by checking for a subtitle. |
| |
| If the lone top-level section itself contains a single |
| second-level section as its first non-comment element, that |
| section's title is promoted to the document's subtitle, and |
| that section's contents become the document's immediate |
| contents. Given this input text:: |
| |
| ================= |
| Top-Level Title |
| ================= |
| |
| Second-Level Title |
| ~~~~~~~~~~~~~~~~~~ |
| |
| A paragraph. |
| |
| After parsing and running the Section Promotion transform, the |
| result is:: |
| |
| <document names="top-level title"> |
| <title> |
| Top-Level Title |
| <subtitle names="second-level title"> |
| Second-Level Title |
| <paragraph> |
| A paragraph. |
| |
| (Note that the implicit hyperlink target generated by the |
| "Second-Level Title" is preserved on the "subtitle" element |
| itself.) |
| |
| Any comment elements occurring before the document title or |
| subtitle are accumulated and inserted as the first body elements |
| after the title(s). |
| |
| This transform also sets the document's metadata title |
| (document['title']). |
| |
| .. _reStructuredText: http://docutils.sf.net/rst.html |
| """ |
| |
| default_priority = 320 |
| |
| def set_metadata(self): |
| """ |
| Set document['title'] metadata title from the following |
| sources, listed in order of priority: |
| |
| * Existing document['title'] attribute. |
| * "title" setting. |
| * Document title node (as promoted by promote_title). |
| """ |
| if not self.document.hasattr('title'): |
| if self.document.settings.title is not None: |
| self.document['title'] = self.document.settings.title |
| elif len(self.document) and isinstance(self.document[0], nodes.title): |
| self.document['title'] = self.document[0].astext() |
| |
| 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() |
| |
| |
| class SectionSubTitle(TitlePromoter): |
| |
| """ |
| This works like document subtitles, but for sections. For example, :: |
| |
| <section> |
| <title> |
| Title |
| <section> |
| <title> |
| Subtitle |
| ... |
| |
| is transformed into :: |
| |
| <section> |
| <title> |
| Title |
| <subtitle> |
| Subtitle |
| ... |
| |
| For details refer to the docstring of DocTitle. |
| """ |
| |
| default_priority = 350 |
| |
| def apply(self): |
| if not getattr(self.document.settings, 'sectsubtitle_xform', 1): |
| return |
| for section in self.document.traverse(nodes.section): |
| # On our way through the node tree, we are deleting |
| # sections, but we call self.promote_subtitle for those |
| # sections nonetheless. To do: Write a test case which |
| # shows the problem and discuss on Docutils-develop. |
| self.promote_subtitle(section) |
| |
| |
| class DocInfo(Transform): |
| |
| """ |
| This transform is specific to the reStructuredText_ markup syntax; |
| see "Bibliographic Fields" in the `reStructuredText Markup |
| Specification`_ for a high-level description. This transform |
| should be run *after* the `DocTitle` transform. |
| |
| Given a field list as the first non-comment element after the |
| document title and subtitle (if present), registered bibliographic |
| field names are transformed to the corresponding DTD elements, |
| becoming child elements of the "docinfo" element (except for a |
| dedication and/or an abstract, which become "topic" elements after |
| "docinfo"). |
| |
| For example, given this document fragment after parsing:: |
| |
| <document> |
| <title> |
| Document Title |
| <field_list> |
| <field> |
| <field_name> |
| Author |
| <field_body> |
| <paragraph> |
| A. Name |
| <field> |
| <field_name> |
| Status |
| <field_body> |
| <paragraph> |
| $RCSfile$ |
| ... |
| |
| After running the bibliographic field list transform, the |
| resulting document tree would look like this:: |
| |
| <document> |
| <title> |
| Document Title |
| <docinfo> |
| <author> |
| A. Name |
| <status> |
| frontmatter.py |
| ... |
| |
| The "Status" field contained an expanded RCS keyword, which is |
| normally (but optionally) cleaned up by the transform. The sole |
| contents of the field body must be a paragraph containing an |
| expanded RCS keyword of the form "$keyword: expansion text $". Any |
| RCS keyword can be processed in any bibliographic field. The |
| dollar signs and leading RCS keyword name are removed. Extra |
| processing is done for the following RCS keywords: |
| |
| - "RCSfile" expands to the name of the file in the RCS or CVS |
| repository, which is the name of the source file with a ",v" |
| suffix appended. The transform will remove the ",v" suffix. |
| |
| - "Date" expands to the format "YYYY/MM/DD hh:mm:ss" (in the UTC |
| time zone). The RCS Keywords transform will extract just the |
| date itself and transform it to an ISO 8601 format date, as in |
| "2000-12-31". |
| |
| (Since the source file for this text is itself stored under CVS, |
| we can't show an example of the "Date" RCS keyword because we |
| can't prevent any RCS keywords used in this explanation from |
| being expanded. Only the "RCSfile" keyword is stable; its |
| expansion text changes only if the file name changes.) |
| |
| .. _reStructuredText: http://docutils.sf.net/rst.html |
| .. _reStructuredText Markup Specification: |
| http://docutils.sf.net/docs/ref/rst/restructuredtext.html |
| """ |
| |
| default_priority = 340 |
| |
| biblio_nodes = { |
| 'author': nodes.author, |
| 'authors': nodes.authors, |
| 'organization': nodes.organization, |
| 'address': nodes.address, |
| 'contact': nodes.contact, |
| 'version': nodes.version, |
| 'revision': nodes.revision, |
| 'status': nodes.status, |
| 'date': nodes.date, |
| 'copyright': nodes.copyright, |
| 'dedication': nodes.topic, |
| 'abstract': nodes.topic} |
| """Canonical field name (lowcased) to node class name mapping for |
| bibliographic fields (field_list).""" |
| |
| def apply(self): |
| if not getattr(self.document.settings, 'docinfo_xform', 1): |
| return |
| document = self.document |
| index = document.first_child_not_matching_class( |
| nodes.PreBibliographic) |
| if index is None: |
| return |
| candidate = document[index] |
| if isinstance(candidate, nodes.field_list): |
| biblioindex = document.first_child_not_matching_class( |
| (nodes.Titular, nodes.Decorative)) |
| nodelist = self.extract_bibliographic(candidate) |
| del document[index] # untransformed field list (candidate) |
| document[biblioindex:biblioindex] = nodelist |
| |
| 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.fully_normalize_name(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) |
| 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 |
| |
| def check_empty_biblio_field(self, field, name): |
| if len(field[-1]) < 1: |
| field[-1] += self.document.reporter.warning( |
| 'Cannot extract empty bibliographic field "%s".' % name, |
| base_node=field) |
| return None |
| return 1 |
| |
| def check_compound_biblio_field(self, field, name): |
| if len(field[-1]) > 1: |
| field[-1] += self.document.reporter.warning( |
| 'Cannot extract compound bibliographic field "%s".' % name, |
| base_node=field) |
| return None |
| if not isinstance(field[-1][0], nodes.paragraph): |
| field[-1] += self.document.reporter.warning( |
| 'Cannot extract bibliographic field "%s" containing ' |
| 'anything other than a single paragraph.' % name, |
| base_node=field) |
| return None |
| return 1 |
| |
| rcs_keyword_substitutions = [ |
| (re.compile(r'\$' r'Date: (\d\d\d\d)[-/](\d\d)[-/](\d\d)[ T][\d:]+' |
| r'[^$]* \$', re.IGNORECASE), r'\1-\2-\3'), |
| (re.compile(r'\$' r'RCSfile: (.+),v \$', re.IGNORECASE), r'\1'), |
| (re.compile(r'\$[a-zA-Z]+: (.+) \$'), r'\1'),] |
| |
| def extract_authors(self, field, name, docinfo): |
| try: |
| if len(field[1]) == 1: |
| if isinstance(field[1][0], nodes.paragraph): |
| authors = self.authors_from_one_paragraph(field) |
| elif isinstance(field[1][0], nodes.bullet_list): |
| authors = self.authors_from_bullet_list(field) |
| else: |
| raise TransformError |
| else: |
| authors = self.authors_from_paragraphs(field) |
| authornodes = [nodes.author('', '', *author) |
| for author in authors if author] |
| if len(authornodes) >= 1: |
| docinfo.append(nodes.authors('', *authornodes)) |
| else: |
| raise TransformError |
| except TransformError: |
| field[-1] += self.document.reporter.warning( |
| 'Bibliographic field "%s" incompatible with extraction: ' |
| 'it must contain either a single paragraph (with authors ' |
| 'separated by one of "%s"), multiple paragraphs (one per ' |
| 'author), or a bullet list with one paragraph (one author) ' |
| 'per item.' |
| % (name, ''.join(self.language.author_separators)), |
| base_node=field) |
| raise |
| |
| def authors_from_one_paragraph(self, field): |
| text = field[1][0].astext().strip() |
| if not text: |
| raise TransformError |
| for authorsep in self.language.author_separators: |
| authornames = text.split(authorsep) |
| if len(authornames) > 1: |
| break |
| authornames = [author.strip() for author in authornames] |
| authors = [[nodes.Text(author)] for author in authornames if author] |
| return authors |
| |
| def authors_from_bullet_list(self, field): |
| authors = [] |
| for item in field[1][0]: |
| if len(item) != 1 or not isinstance(item[0], nodes.paragraph): |
| raise TransformError |
| authors.append(item[0].children) |
| if not authors: |
| raise TransformError |
| return authors |
| |
| def authors_from_paragraphs(self, field): |
| for item in field[1]: |
| if not isinstance(item, nodes.paragraph): |
| raise TransformError |
| authors = [item.children for item in field[1]] |
| return authors |
