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docutils_transforms_reps.py
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docutils_transforms_reps.py
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# $Id: reps.py 4564 2006-05-21 20:44:42Z wiemann $
# Author: David Goodger <goodger@python.org>
# Copyright: This module has been placed in the public domain.
"""
Transforms for REP processing.
- `Headers`: Used to transform a REP's initial RFC-2822 header. It remains a
field list, but some entries get processed.
- `Contents`: Auto-inserts a table of contents.
- `REPZero`: Special processing for REP 0.
"""
__docformat__ = 'reStructuredText'
import os
import re
import time
from docutils import nodes, utils, languages
from docutils import DataError
from docutils.transforms import Transform
from docutils.transforms import parts, references, misc
class Headers(Transform):
"""Process fields in a REP's initial RFC-2822 header."""
default_priority = 360
rep_url = 'rep-%04d'
rep_git_url = \
'https://github.com/ros-infrastructure/rep/blob/master/rep-%04d.rst'
rcs_keyword_substitutions = (
(re.compile(r'\$' r'RCSfile: (.+),v \$$', re.IGNORECASE), r'\1'),
(re.compile(r'\$[a-zA-Z]+: (.+) \$$'), r'\1'),)
def apply(self):
self.document.settings.rep_base_url = 'http://ros.org/reps/'
if not len(self.document):
# @@@ replace these DataErrors with proper system messages
raise DataError('Document tree is empty.')
header = self.document[0]
if not isinstance(header, nodes.field_list) or \
'rfc2822' not in header['classes']:
raise DataError('Document does not begin with an RFC-2822 '
'header; it is not a REP.')
rep = None
for field in header:
if field[0].astext().lower() == 'rep': # should be the first field
value = field[1].astext()
try:
rep = int(value)
repo_url = self.rep_git_url % rep
except ValueError:
rep = value
repo_url = None
msg = self.document.reporter.warning(
'"REP" header must contain an integer; "%s" is an '
'invalid value.' % rep, base_node=field)
msgid = self.document.set_id(msg)
prb = nodes.problematic(value, value or '(none)',
refid=msgid)
prbid = self.document.set_id(prb)
msg.add_backref(prbid)
if len(field[1]):
field[1][0][:] = [prb]
else:
field[1] += nodes.paragraph('', '', prb)
break
if rep is None:
raise DataError('Document does not contain an RFC-2822 "REP" '
'header.')
if rep == 0:
# Special processing for REP 0.
pending = nodes.pending(REPZero)
self.document.insert(1, pending)
self.document.note_pending(pending)
if len(header) < 2 or header[1][0].astext().lower() != 'title':
raise DataError('No title!')
for field in header:
name = field[0].astext().lower()
body = field[1]
if len(body) > 1:
raise DataError('REP header field body contains multiple '
'elements:\n%s' % field.pformat(level=1))
elif len(body) == 1:
if not isinstance(body[0], nodes.paragraph):
raise DataError('REP header field body may only contain '
'a single paragraph:\n%s'
% field.pformat(level=1))
elif name == 'last-modified':
date = time.strftime(
'%d-%b-%Y',
time.localtime(os.stat(self.document['source'])[8]))
if repo_url:
body += nodes.paragraph(
'', '', nodes.reference('', date, refuri=repo_url))
else:
# empty
continue
para = body[0]
if name == 'author':
for node in para:
if isinstance(node, nodes.reference):
node.replace_self(mask_email(node))
elif name == 'discussions-to':
for node in para:
if isinstance(node, nodes.reference):
node.replace_self(mask_email(node, rep))
elif name in ('replaces', 'replaced-by', 'requires'):
newbody = []
space = nodes.Text(' ')
for refrep in re.split(',?\s+', body.astext()):
repno = int(refrep)
newbody.append(nodes.reference(
refrep, refrep,
refuri=(self.document.settings.rep_base_url
+ self.rep_url % repno)))
newbody.append(space)
para[:] = newbody[:-1] # drop trailing space
elif name == 'last-modified':
utils.clean_rcs_keywords(para, self.rcs_keyword_substitutions)
if repo_url:
date = para.astext()
para[:] = [nodes.reference('', date, refuri=repo_url)]
elif name == 'content-type':
rep_type = para.astext()
uri = self.document.settings.rep_base_url + self.rep_url % 12
para[:] = [nodes.reference('', rep_type, refuri=uri)]
elif name == 'version' and len(body):
utils.clean_rcs_keywords(para, self.rcs_keyword_substitutions)
class Contents(Transform):
"""
Insert an empty table of contents topic and a transform placeholder into
the document after the RFC 2822 header.
"""
default_priority = 380
def apply(self):
try:
#incompatible API change in docutils
language = languages.get_language(
self.document.settings.language_code, None)
except TypeError:
language = languages.get_language(
self.document.settings.language_code)
name = language.labels['contents']
title = nodes.title('', name)
topic = nodes.topic('', title, classes=['contents'])
name = nodes.fully_normalize_name(name)
if not self.document.has_name(name):
topic['names'].append(name)
self.document.note_implicit_target(topic)
pending = nodes.pending(parts.Contents)
topic += pending
self.document.insert(1, topic)
self.document.note_pending(pending)
class TargetNotes(Transform):
"""
Locate the "References" section, insert a placeholder for an external
target footnote insertion transform at the end, and schedule the
transform to run immediately.
"""
default_priority = 520
def apply(self):
doc = self.document
i = len(doc) - 1
refsect = copyright = None
while i >= 0 and isinstance(doc[i], nodes.section):
title_words = doc[i][0].astext().lower().split()
if 'references' in title_words:
refsect = doc[i]
break
elif 'copyright' in title_words:
copyright = i
i -= 1
if not refsect:
refsect = nodes.section()
refsect += nodes.title('', 'References')
doc.set_id(refsect)
if copyright:
# Put the new "References" section before "Copyright":
doc.insert(copyright, refsect)
else:
# Put the new "References" section at end of doc:
doc.append(refsect)
pending = nodes.pending(references.TargetNotes)
refsect.append(pending)
self.document.note_pending(pending, 0)
pending = nodes.pending(misc.CallBack,
details={'callback': self.cleanup_callback})
refsect.append(pending)
self.document.note_pending(pending, 1)
def cleanup_callback(self, pending):
"""
Remove an empty "References" section.
Called after the `references.TargetNotes` transform is complete.
"""
if len(pending.parent) == 2: # <title> and <pending>
pending.parent.parent.remove(pending.parent)
class REPZero(Transform):
"""Special processing for REP 0."""
default_priority = 760
def apply(self):
visitor = REPZeroSpecial(self.document)
self.document.walk(visitor)
self.startnode.parent.remove(self.startnode)
class REPZeroSpecial(nodes.SparseNodeVisitor):
"""
Perform the special processing needed by REP 0:
- Mask email addresses.
- Link REP numbers in the second column of 4-column tables to the REPs
themselves.
"""
rep_url = Headers.rep_url
def unknown_visit(self, node):
pass
def visit_reference(self, node):
node.replace_self(mask_email(node))
def visit_field_list(self, node):
if 'rfc2822' in node['classes']:
raise nodes.SkipNode
def visit_tgroup(self, node):
self.rep_table = node['cols'] == 4
self.entry = 0
def visit_colspec(self, node):
self.entry += 1
if self.rep_table and self.entry == 2:
node['classes'].append('num')
def visit_row(self, node):
self.entry = 0
def visit_entry(self, node):
self.document.settings.rep_base_url = 'http://ros.org/reps/'
self.entry += 1
if self.rep_table and self.entry == 2 and len(node) == 1:
node['classes'].append('num')
p = node[0]
if isinstance(p, nodes.paragraph) and len(p) == 1:
text = p.astext()
try:
rep = int(text)
ref = (self.document.settings.rep_base_url
+ self.rep_url % rep)
p[0] = nodes.reference(text, text, refuri=ref)
except ValueError:
pass
non_masked_addresses = ('reps@python.org',
'ros-users@code.ros.org',
'ros-developers@code.ros.org')
def mask_email(ref, repno=None):
"""
Mask the email address in `ref` and return a replacement node.
`ref` is returned unchanged if it contains no email address.
For email addresses such as "user@host", mask the address as "user at
host" (text) to thwart simple email address harvesters (except for those
listed in `non_masked_addresses`). If a REP number (`repno`) is given,
return a reference including a default email subject.
"""
if ref.hasattr('refuri') and ref['refuri'].startswith('mailto:'):
if ref['refuri'][8:] in non_masked_addresses:
replacement = ref[0]
else:
replacement_text = ref.astext().replace('@', ' at ')
replacement = nodes.raw('', replacement_text, format='html')
if repno is None:
return replacement
else:
ref['refuri'] += '?subject=REP%%20%s' % repno
ref[:] = [replacement]
return ref
else:
return ref