forked from varia/varia.website
549 lines
20 KiB
Python
549 lines
20 KiB
Python
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# $Id: frontmatter.py 8389 2019-09-11 11:39:13Z milde $
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# Author: David Goodger, Ueli Schlaepfer <goodger@python.org>
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# Copyright: This module has been placed in the public domain.
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"""
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Transforms related to the front matter of a document or a section
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(information found before the main text):
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- `DocTitle`: Used to transform a lone top level section's title to
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the document title, promote a remaining lone top-level section's
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title to the document subtitle, and determine the document's title
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metadata (document['title']) based on the document title and/or the
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"title" setting.
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- `SectionSubTitle`: Used to transform a lone subsection into a
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subtitle.
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- `DocInfo`: Used to transform a bibliographic field list into docinfo
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elements.
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"""
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__docformat__ = 'reStructuredText'
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import re
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import sys
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from docutils import nodes, utils
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from docutils.transforms import TransformError, Transform
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if sys.version_info >= (3, 0):
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unicode = str # noqa
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class TitlePromoter(Transform):
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"""
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Abstract base class for DocTitle and SectionSubTitle transforms.
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"""
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def promote_title(self, node):
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"""
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Transform the following tree::
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<node>
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<section>
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<title>
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...
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into ::
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<node>
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<title>
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...
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`node` is normally a document.
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"""
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# Type check
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if not isinstance(node, nodes.Element):
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raise TypeError('node must be of Element-derived type.')
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# `node` must not have a title yet.
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assert not (len(node) and isinstance(node[0], nodes.title))
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section, index = self.candidate_index(node)
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if index is None:
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return False
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# Transfer the section's attributes to the node:
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# NOTE: Change `replace` to False to NOT replace attributes that
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# already exist in node with those in section.
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# NOTE: Remove `and_source` to NOT copy the 'source'
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# attribute from section
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node.update_all_atts_concatenating(section, replace=True, and_source=True)
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# setup_child is called automatically for all nodes.
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node[:] = (section[:1] # section title
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+ node[:index] # everything that was in the
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# node before the section
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+ section[1:]) # everything that was in the section
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assert isinstance(node[0], nodes.title)
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return True
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def promote_subtitle(self, node):
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"""
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Transform the following node tree::
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<node>
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<title>
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<section>
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<title>
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...
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into ::
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<node>
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<title>
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<subtitle>
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...
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"""
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# Type check
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if not isinstance(node, nodes.Element):
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raise TypeError('node must be of Element-derived type.')
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subsection, index = self.candidate_index(node)
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if index is None:
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return False
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subtitle = nodes.subtitle()
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# Transfer the subsection's attributes to the new subtitle
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# NOTE: Change `replace` to False to NOT replace attributes
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# that already exist in node with those in section.
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# NOTE: Remove `and_source` to NOT copy the 'source'
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# attribute from section.
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subtitle.update_all_atts_concatenating(subsection, replace=True, and_source=True)
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# Transfer the contents of the subsection's title to the
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# subtitle:
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subtitle[:] = subsection[0][:]
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node[:] = (node[:1] # title
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+ [subtitle]
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# everything that was before the section:
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+ node[1:index]
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# everything that was in the subsection:
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+ subsection[1:])
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return True
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def candidate_index(self, node):
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"""
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Find and return the promotion candidate and its index.
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Return (None, None) if no valid candidate was found.
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"""
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index = node.first_child_not_matching_class(
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nodes.PreBibliographic)
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if (index is None or len(node) > (index + 1)
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or not isinstance(node[index], nodes.section)):
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return None, None
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else:
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return node[index], index
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class DocTitle(TitlePromoter):
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"""
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In reStructuredText_, there is no way to specify a document title
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and subtitle explicitly. Instead, we can supply the document title
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(and possibly the subtitle as well) implicitly, and use this
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two-step transform to "raise" or "promote" the title(s) (and their
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corresponding section contents) to the document level.
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1. If the document contains a single top-level section as its
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first non-comment element, the top-level section's title
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becomes the document's title, and the top-level section's
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contents become the document's immediate contents. The lone
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top-level section header must be the first non-comment element
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in the document.
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For example, take this input text::
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=================
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Top-Level Title
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=================
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A paragraph.
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Once parsed, it looks like this::
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<document>
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<section names="top-level title">
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<title>
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Top-Level Title
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<paragraph>
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A paragraph.
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After running the DocTitle transform, we have::
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<document names="top-level title">
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<title>
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Top-Level Title
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<paragraph>
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A paragraph.
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2. If step 1 successfully determines the document title, we
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continue by checking for a subtitle.
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If the lone top-level section itself contains a single
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second-level section as its first non-comment element, that
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section's title is promoted to the document's subtitle, and
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that section's contents become the document's immediate
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contents. Given this input text::
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=================
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Top-Level Title
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=================
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Second-Level Title
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~~~~~~~~~~~~~~~~~~
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A paragraph.
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After parsing and running the Section Promotion transform, the
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result is::
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<document names="top-level title">
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<title>
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Top-Level Title
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<subtitle names="second-level title">
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Second-Level Title
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<paragraph>
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A paragraph.
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(Note that the implicit hyperlink target generated by the
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"Second-Level Title" is preserved on the "subtitle" element
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itself.)
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Any comment elements occurring before the document title or
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subtitle are accumulated and inserted as the first body elements
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after the title(s).
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This transform also sets the document's metadata title
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(document['title']).
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.. _reStructuredText: http://docutils.sf.net/rst.html
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"""
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default_priority = 320
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def set_metadata(self):
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"""
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Set document['title'] metadata title from the following
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sources, listed in order of priority:
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* Existing document['title'] attribute.
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* "title" setting.
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* Document title node (as promoted by promote_title).
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"""
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if not self.document.hasattr('title'):
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if self.document.settings.title is not None:
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self.document['title'] = self.document.settings.title
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elif len(self.document) and isinstance(self.document[0], nodes.title):
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self.document['title'] = self.document[0].astext()
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def apply(self):
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if getattr(self.document.settings, 'doctitle_xform', 1):
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# promote_(sub)title defined in TitlePromoter base class.
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if self.promote_title(self.document):
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# If a title has been promoted, also try to promote a
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# subtitle.
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self.promote_subtitle(self.document)
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# Set document['title'].
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self.set_metadata()
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class SectionSubTitle(TitlePromoter):
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"""
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This works like document subtitles, but for sections. For example, ::
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<section>
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<title>
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Title
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<section>
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<title>
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Subtitle
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...
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is transformed into ::
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<section>
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<title>
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Title
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<subtitle>
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Subtitle
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...
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For details refer to the docstring of DocTitle.
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"""
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default_priority = 350
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def apply(self):
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if not getattr(self.document.settings, 'sectsubtitle_xform', 1):
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return
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for section in self.document._traverse(nodes.section):
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# On our way through the node tree, we are modifying it
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# but only the not-yet-visited part, so that the iterator
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# returned by _traverse() is not corrupted.
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self.promote_subtitle(section)
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class DocInfo(Transform):
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"""
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This transform is specific to the reStructuredText_ markup syntax;
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see "Bibliographic Fields" in the `reStructuredText Markup
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Specification`_ for a high-level description. This transform
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should be run *after* the `DocTitle` transform.
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Given a field list as the first non-comment element after the
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document title and subtitle (if present), registered bibliographic
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field names are transformed to the corresponding DTD elements,
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becoming child elements of the "docinfo" element (except for a
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dedication and/or an abstract, which become "topic" elements after
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"docinfo").
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For example, given this document fragment after parsing::
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<document>
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<title>
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Document Title
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<field_list>
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<field>
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<field_name>
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Author
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<field_body>
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<paragraph>
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A. Name
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<field>
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<field_name>
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Status
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<field_body>
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<paragraph>
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$RCSfile$
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...
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After running the bibliographic field list transform, the
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resulting document tree would look like this::
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<document>
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<title>
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Document Title
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<docinfo>
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<author>
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A. Name
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<status>
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frontmatter.py
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...
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The "Status" field contained an expanded RCS keyword, which is
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normally (but optionally) cleaned up by the transform. The sole
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contents of the field body must be a paragraph containing an
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expanded RCS keyword of the form "$keyword: expansion text $". Any
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RCS keyword can be processed in any bibliographic field. The
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dollar signs and leading RCS keyword name are removed. Extra
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processing is done for the following RCS keywords:
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- "RCSfile" expands to the name of the file in the RCS or CVS
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repository, which is the name of the source file with a ",v"
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suffix appended. The transform will remove the ",v" suffix.
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- "Date" expands to the format "YYYY/MM/DD hh:mm:ss" (in the UTC
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time zone). The RCS Keywords transform will extract just the
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date itself and transform it to an ISO 8601 format date, as in
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"2000-12-31".
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(Since the source file for this text is itself stored under CVS,
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we can't show an example of the "Date" RCS keyword because we
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can't prevent any RCS keywords used in this explanation from
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being expanded. Only the "RCSfile" keyword is stable; its
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expansion text changes only if the file name changes.)
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.. _reStructuredText: http://docutils.sf.net/rst.html
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.. _reStructuredText Markup Specification:
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http://docutils.sf.net/docs/ref/rst/restructuredtext.html
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"""
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default_priority = 340
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biblio_nodes = {
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'author': nodes.author,
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'authors': nodes.authors,
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'organization': nodes.organization,
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'address': nodes.address,
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'contact': nodes.contact,
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'version': nodes.version,
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'revision': nodes.revision,
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'status': nodes.status,
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'date': nodes.date,
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'copyright': nodes.copyright,
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'dedication': nodes.topic,
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'abstract': nodes.topic}
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"""Canonical field name (lowcased) to node class name mapping for
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bibliographic fields (field_list)."""
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def apply(self):
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if not getattr(self.document.settings, 'docinfo_xform', 1):
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return
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document = self.document
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index = document.first_child_not_matching_class(
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nodes.PreBibliographic)
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if index is None:
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return
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candidate = document[index]
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if isinstance(candidate, nodes.field_list):
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biblioindex = document.first_child_not_matching_class(
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(nodes.Titular, nodes.Decorative))
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nodelist = self.extract_bibliographic(candidate)
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del document[index] # untransformed field list (candidate)
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document[biblioindex:biblioindex] = nodelist
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def extract_bibliographic(self, field_list):
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docinfo = nodes.docinfo()
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bibliofields = self.language.bibliographic_fields
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labels = self.language.labels
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topics = {'dedication': None, 'abstract': None}
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for field in field_list:
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try:
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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])
|
||
|
|
title[0].rawsource = 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 not in bibliofields:
|
||
|
|
classvalue = nodes.make_id(normedname)
|
||
|
|
if classvalue:
|
||
|
|
field['classes'].append(classvalue)
|
||
|
|
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):
|
||
|
|
"""Return list of Text nodes for authornames.
|
||
|
|
|
||
|
|
The set of separators is locale dependent (default: ";"- or ",").
|
||
|
|
"""
|
||
|
|
# @@ keep original formatting? (e.g. ``:authors: A. Test, *et-al*``)
|
||
|
|
text = ''.join(unicode(node)
|
||
|
|
for node in field[1].traverse(nodes.Text))
|
||
|
|
if not text:
|
||
|
|
raise TransformError
|
||
|
|
for authorsep in self.language.author_separators:
|
||
|
|
# don't split at escaped `authorsep`:
|
||
|
|
pattern = '(?<!\x00)%s' % authorsep
|
||
|
|
authornames = re.split(pattern, text)
|
||
|
|
if len(authornames) > 1:
|
||
|
|
break
|
||
|
|
authornames = (name.strip() for name in authornames)
|
||
|
|
authors = [[nodes.Text(name, utils.unescape(name, True))]
|
||
|
|
for name in authornames if name]
|
||
|
|
return authors
|
||
|
|
|
||
|
|
def authors_from_bullet_list(self, field):
|
||
|
|
authors = []
|
||
|
|
for item in field[1][0]:
|
||
|
|
if isinstance(item, nodes.comment):
|
||
|
|
continue
|
||
|
|
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, nodes.comment)):
|
||
|
|
raise TransformError
|
||
|
|
authors = [item.children for item in field[1]
|
||
|
|
if not isinstance(item, nodes.comment)]
|
||
|
|
return authors
|