{{ message }}
Repository navigation
Expand file tree
/
Copy pathfootnotes.py
More file actions
494 lines (409 loc) · 20.4 KB
/
Copy pathfootnotes.py
File metadata and controls
494 lines (409 loc) · 20.4 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
# Footnotes Extension for Python-Markdown
# =======================================
# Adds footnote handling to Python-Markdown.
# See https://Python-Markdown.github.io/extensions/footnotes
# for documentation.
# Copyright The Python Markdown Project
# License: [BSD](https://opensource.org/licenses/bsd-license.php)
"""
Adds footnote handling to Python-Markdown.
See the [documentation](https://Python-Markdown.github.io/extensions/footnotes)
for details.
"""
from __future__ import annotations
from . import Extension
from ..blockprocessors import BlockProcessor
from ..inlinepatterns import InlineProcessor
from ..treeprocessors import Treeprocessor
from ..postprocessors import Postprocessor
from .. import util
from collections import OrderedDict
import re
import copy
import xml.etree.ElementTree as etree
FN_BACKLINK_TEXT = util.STX + "zz1337820767766393qq" + util.ETX
NBSP_PLACEHOLDER = util.STX + "qq3936677670287331zz" + util.ETX
RE_REF_ID = re.compile(r'(fnref)(\d+)')
RE_REFERENCE = re.compile(r'(?<!!)\[\^([^\]]*)\](?!\s*:)')
class FootnoteExtension(Extension):
""" Footnote Extension. """
def __init__(self, **kwargs):
""" Setup configs. """
self.config = {
'PLACE_MARKER': [
'///Footnotes Go Here///', 'The text string that marks where the footnotes go'
],
'UNIQUE_IDS': [
False, 'Avoid name collisions across multiple calls to `reset()`.'
],
'BACKLINK_TEXT': [
'↩', "The text string that links from the footnote to the reader's place."
],
'SUPERSCRIPT_TEXT': [
'{}', "The text string that links from the reader's place to the footnote."
],
'BACKLINK_TITLE': [
'Jump back to footnote %d in the text',
'The text string used for the title HTML attribute of the backlink. '
'%d will be replaced by the footnote number.'
],
'SEPARATOR': [
':', 'Footnote separator.'
],
'USE_DEFINITION_ORDER': [
True,
'Order footnote labels by definition order (True) or by document order (False). '
'Default: True.'
]
}
""" Default configuration options. """
super().__init__(**kwargs)
# In multiple invocations, emit links that don't get tangled.
self.unique_prefix = 0
self.found_refs: dict[str, int] = {}
self.used_refs: set[str] = set()
# Backward compatibility with old '%d' placeholder
self.setConfig('BACKLINK_TITLE', self.getConfig("BACKLINK_TITLE").replace("%d", "{}"))
self.reset()
def extendMarkdown(self, md):
""" Register the processors.
| Class Instance | Registry | Name | Priority |
| --------------------------------------------------------------------------- | ---------------------------------------------------------------- | ------ | :------: |
| [`FootnoteBlockProcessor`][markdown.extensions.footnotes.FootnoteBlockProcessor] | [`blockprocessors`][markdown.blockprocessors.build_block_parser] | `footnote` | `17` |
| [`FootnoteInlineProcessor`][markdown.extensions.footnotes.FootnoteInlineProcessor] | [`inlinepatterns`][markdown.inlinepatterns.build_inlinepatterns] | `footnote` | `175` |
| [`FootnoteTreeprocessor`][markdown.extensions.footnotes.FootnoteTreeprocessor] | [`treeprocessors`][markdown.treeprocessors.build_treeprocessors] | `footnote` | `50` |
| [`FootnoteReorderingProcessor`][markdown.extensions.footnotes.FootnoteReorderingProcessor] | [`treeprocessors`][markdown.treeprocessors.build_treeprocessors] | `footnote-reorder` | `19` |
| [`FootnotePostTreeprocessor`][markdown.extensions.footnotes.FootnotePostTreeprocessor] | [`treeprocessors`][markdown.treeprocessors.build_treeprocessors] | `footnote-duplicate` | `15` |
| [`FootnotePostprocessor`][markdown.extensions.footnotes.FootnotePostprocessor] | [`postprocessors`][markdown.postprocessors.build_postprocessors] | `footnote` | `25` |
"""
# flake8: noqa: E501 88-95
md.registerExtension(self)
self.parser = md.parser
self.md = md
# Insert a `blockprocessor` before `ReferencePreprocessor`
md.parser.blockprocessors.register(FootnoteBlockProcessor(self), 'footnote', 17)
# Insert an inline pattern before `ImageReferencePattern`
FOOTNOTE_RE = r'\[\^([^\]]*)\]' # blah blah [^1] blah
md.inlinePatterns.register(FootnoteInlineProcessor(FOOTNOTE_RE, self), 'footnote', 175)
# Insert a tree-processor that would actually add the footnote div
# This must be before all other tree-processors (i.e., `inline` and
# `codehilite`) so they can run on the the contents of the div.
md.treeprocessors.register(FootnoteTreeprocessor(self), 'footnote', 50)
# Insert a tree-processor to reorder the footnotes if necessary. This must be after
# `inline` tree-processor so it can access the footnote reference order
# (`self.footnote_order`) that gets populated by the `FootnoteInlineProcessor`.
if not self.getConfig("USE_DEFINITION_ORDER"):
md.treeprocessors.register(FootnoteReorderingProcessor(self), 'footnote-reorder', 19)
# Insert a tree-processor that will run after inline is done.
# In this tree-processor we want to check our duplicate footnote tracker
# And add additional `backrefs` to the footnote pointing back to the
# duplicated references.
md.treeprocessors.register(FootnotePostTreeprocessor(self), 'footnote-duplicate', 15)
# Insert a postprocessor after amp_substitute processor
md.postprocessors.register(FootnotePostprocessor(self), 'footnote', 25)
def reset(self) -> None:
""" Clear footnotes on reset, and prepare for distinct document. """
self.footnote_order: list[str] = []
self.footnotes: OrderedDict[str, str] = OrderedDict()
self.unique_prefix += 1
self.found_refs = {}
self.used_refs = set()
def unique_ref(self, reference: str, found: bool = False) -> str:
""" Get a unique reference if there are duplicates. """
if not found:
return reference
original_ref = reference
while reference in self.used_refs:
ref, rest = reference.split(self.get_separator(), 1)
m = RE_REF_ID.match(ref)
if m:
reference = '%s%d%s%s' % (m.group(1), int(m.group(2))+1, self.get_separator(), rest)
else:
reference = '%s%d%s%s' % (ref, 2, self.get_separator(), rest)
self.used_refs.add(reference)
if original_ref in self.found_refs:
self.found_refs[original_ref] += 1
else:
self.found_refs[original_ref] = 1
return reference
def findFootnotesPlaceholder(
self, root: etree.Element
) -> tuple[etree.Element, etree.Element, bool] | None:
""" Return ElementTree Element that contains Footnote placeholder. """
def finder(element):
for child in element:
if child.text:
if child.text.find(self.getConfig("PLACE_MARKER")) > -1:
return child, element, True
if child.tail:
if child.tail.find(self.getConfig("PLACE_MARKER")) > -1:
return child, element, False
child_res = finder(child)
if child_res is not None:
return child_res
return None
res = finder(root)
return res
def setFootnote(self, id: str, text: str) -> None:
""" Store a footnote for later retrieval. """
self.footnotes[id] = text
def addFootnoteRef(self, id: str) -> None:
""" Store a footnote reference id in order of appearance. """
if id not in self.footnote_order:
self.footnote_order.append(id)
def get_separator(self) -> str:
""" Get the footnote separator. """
return self.getConfig("SEPARATOR")
def makeFootnoteId(self, id: str) -> str:
""" Return footnote link id. """
if self.getConfig("UNIQUE_IDS"):
return 'fn%s%d-%s' % (self.get_separator(), self.unique_prefix, id)
else:
return 'fn{}{}'.format(self.get_separator(), id)
def makeFootnoteRefId(self, id: str, found: bool = False) -> str:
""" Return footnote back-link id. """
if self.getConfig("UNIQUE_IDS"):
return self.unique_ref('fnref%s%d-%s' % (self.get_separator(), self.unique_prefix, id), found)
else:
return self.unique_ref('fnref{}{}'.format(self.get_separator(), id), found)
def makeFootnotesDiv(self, root: etree.Element) -> etree.Element | None:
""" Return `div` of footnotes as `etree` Element. """
if not list(self.footnotes.keys()):
return None
div = etree.Element("div")
div.set('class', 'footnote')
etree.SubElement(div, "hr")
ol = etree.SubElement(div, "ol")
surrogate_parent = etree.Element("div")
for index, id in enumerate(self.footnotes.keys(), start=1):
li = etree.SubElement(ol, "li")
li.set("id", self.makeFootnoteId(id))
# Parse footnote with surrogate parent as `li` cannot be used.
# List block handlers have special logic to deal with `li`.
# When we are done parsing, we will copy everything over to `li`.
self.parser.parseChunk(surrogate_parent, self.footnotes[id])
for el in list(surrogate_parent):
li.append(el)
surrogate_parent.remove(el)
backlink = etree.Element("a")
backlink.set("href", "#" + self.makeFootnoteRefId(id))
backlink.set("class", "footnote-backref")
backlink.set(
"title",
self.getConfig('BACKLINK_TITLE').format(index)
)
backlink.text = FN_BACKLINK_TEXT
if len(li):
node = li[-1]
if node.tag == "p":
node.text = node.text + NBSP_PLACEHOLDER
node.append(backlink)
else:
p = etree.SubElement(li, "p")
p.append(backlink)
return div
class FootnoteBlockProcessor(BlockProcessor):
""" Find footnote definitions and store for later use. """
RE = re.compile(r'^[ ]{0,3}\[\^([^\]]*)\]:[ ]*(.*)$', re.MULTILINE)
def __init__(self, footnotes: FootnoteExtension):
super().__init__(footnotes.parser)
self.footnotes = footnotes
def test(self, parent: etree.Element, block: str) -> bool:
return True
def run(self, parent: etree.Element, blocks: list[str]) -> bool:
""" Find, set, and remove footnote definitions. """
block = blocks.pop(0)
m = self.RE.search(block)
if m:
id = m.group(1)
fn_blocks = [m.group(2)]
# Handle rest of block
therest = block[m.end():].lstrip('\n')
m2 = self.RE.search(therest)
if m2:
# Another footnote exists in the rest of this block.
# Any content before match is continuation of this footnote, which may be lazily indented.
before = therest[:m2.start()].rstrip('\n')
fn_blocks[0] = '\n'.join([fn_blocks[0], self.detab(before)]).lstrip('\n')
# Add back to blocks everything from beginning of match forward for next iteration.
blocks.insert(0, therest[m2.start():])
else:
# All remaining lines of block are continuation of this footnote, which may be lazily indented.
fn_blocks[0] = '\n'.join([fn_blocks[0], self.detab(therest)]).strip('\n')
# Check for child elements in remaining blocks.
fn_blocks.extend(self.detectTabbed(blocks))
footnote = "\n\n".join(fn_blocks)
self.footnotes.setFootnote(id, footnote.rstrip())
if block[:m.start()].strip():
# Add any content before match back to blocks as separate block
blocks.insert(0, block[:m.start()].rstrip('\n'))
return True
# No match. Restore block.
blocks.insert(0, block)
return False
def detectTabbed(self, blocks: list[str]) -> list[str]:
""" Find indented text and remove indent before further processing.
Returns:
A list of blocks with indentation removed.
"""
fn_blocks = []
while blocks:
if blocks[0].startswith(' '*4):
block = blocks.pop(0)
# Check for new footnotes within this block and split at new footnote.
m = self.RE.search(block)
if m:
# Another footnote exists in this block.
# Any content before match is continuation of this footnote, which may be lazily indented.
before = block[:m.start()].rstrip('\n')
fn_blocks.append(self.detab(before))
# Add back to blocks everything from beginning of match forward for next iteration.
blocks.insert(0, block[m.start():])
# End of this footnote.
break
else:
# Entire block is part of this footnote.
fn_blocks.append(self.detab(block))
else:
# End of this footnote.
break
return fn_blocks
def detab(self, block: str) -> str:
""" Remove one level of indent from a block.
Preserve lazily indented blocks by only removing indent from indented lines.
"""
lines = block.split('\n')
for i, line in enumerate(lines):
if line.startswith(' '*4):
lines[i] = line[4:]
return '\n'.join(lines)
class FootnoteInlineProcessor(InlineProcessor):
""" `InlineProcessor` for footnote markers in a document's body text. """
def __init__(self, pattern: str, footnotes: FootnoteExtension):
super().__init__(pattern)
self.footnotes = footnotes
def handleMatch(self, m: re.Match[str], data: str) -> tuple[etree.Element | None, int | None, int | None]:
id = m.group(1)
if id in self.footnotes.footnotes.keys():
self.footnotes.addFootnoteRef(id)
if not self.footnotes.getConfig("USE_DEFINITION_ORDER"):
# Order by reference
footnote_num = self.footnotes.footnote_order.index(id) + 1
else:
# Order by definition
footnote_num = list(self.footnotes.footnotes.keys()).index(id) + 1
sup = etree.Element("sup")
a = etree.SubElement(sup, "a")
sup.set('id', self.footnotes.makeFootnoteRefId(id, found=True))
a.set('href', '#' + self.footnotes.makeFootnoteId(id))
a.set('class', 'footnote-ref')
a.text = self.footnotes.getConfig("SUPERSCRIPT_TEXT").format(footnote_num)
return sup, m.start(0), m.end(0)
else:
return None, None, None
class FootnotePostTreeprocessor(Treeprocessor):
""" Amend footnote div with duplicates. """
def __init__(self, footnotes: FootnoteExtension):
self.footnotes = footnotes
def add_duplicates(self, li: etree.Element, duplicates: int) -> None:
""" Adjust current `li` and add the duplicates: `fnref2`, `fnref3`, etc. """
for link in li.iter('a'):
# Find the link that needs to be duplicated.
if link.attrib.get('class', '') == 'footnote-backref':
ref, rest = link.attrib['href'].split(self.footnotes.get_separator(), 1)
# Duplicate link the number of times we need to
# and point the to the appropriate references.
links = []
for index in range(2, duplicates + 1):
sib_link = copy.deepcopy(link)
sib_link.attrib['href'] = '%s%d%s%s' % (ref, index, self.footnotes.get_separator(), rest)
links.append(sib_link)
self.offset += 1
# Add all the new duplicate links.
el = list(li)[-1]
for link in links:
el.append(link)
break
def get_num_duplicates(self, li: etree.Element) -> int:
""" Get the number of duplicate refs of the footnote. """
fn, rest = li.attrib.get('id', '').split(self.footnotes.get_separator(), 1)
link_id = '{}ref{}{}'.format(fn, self.footnotes.get_separator(), rest)
return self.footnotes.found_refs.get(link_id, 0)
def handle_duplicates(self, parent: etree.Element) -> None:
""" Find duplicate footnotes and format and add the duplicates. """
for li in list(parent):
# Check number of duplicates footnotes and insert
# additional links if needed.
count = self.get_num_duplicates(li)
if count > 1:
self.add_duplicates(li, count)
def run(self, root: etree.Element) -> None:
""" Crawl the footnote div and add missing duplicate footnotes. """
self.offset = 0
for div in root.iter('div'):
if div.attrib.get('class', '') == 'footnote':
# Footnotes should be under the first ordered list under
# the footnote div. So once we find it, quit.
for ol in div.iter('ol'):
self.handle_duplicates(ol)
break
class FootnoteTreeprocessor(Treeprocessor):
""" Build and append footnote div to end of document. """
def __init__(self, footnotes: FootnoteExtension):
self.footnotes = footnotes
def run(self, root: etree.Element) -> None:
footnotesDiv = self.footnotes.makeFootnotesDiv(root)
if footnotesDiv is not None:
result = self.footnotes.findFootnotesPlaceholder(root)
if result:
child, parent, isText = result
ind = list(parent).index(child)
if isText:
parent.remove(child)
parent.insert(ind, footnotesDiv)
else:
parent.insert(ind + 1, footnotesDiv)
child.tail = None
else:
root.append(footnotesDiv)
class FootnoteReorderingProcessor(Treeprocessor):
""" Reorder list items in the footnotes div. """
def __init__(self, footnotes: FootnoteExtension):
self.footnotes = footnotes
def run(self, root: etree.Element) -> None:
if not self.footnotes.footnotes:
return
if self.footnotes.footnote_order != list(self.footnotes.footnotes.keys()):
for div in root.iter('div'):
if div.attrib.get('class', '') == 'footnote':
self.reorder_footnotes(div)
break
def reorder_footnotes(self, parent: etree.Element) -> None:
old_list = parent.find('ol')
parent.remove(old_list)
items = old_list.findall('li')
def order_by_id(li) -> int:
id = li.attrib.get('id', '').split(self.footnotes.get_separator(), 1)[-1]
return (
self.footnotes.footnote_order.index(id)
if id in self.footnotes.footnote_order
else len(self.footnotes.footnotes)
)
items = sorted(items, key=order_by_id)
new_list = etree.SubElement(parent, 'ol')
for index, item in enumerate(items, start=1):
backlink = item.find('.//a[@class="footnote-backref"]')
backlink.set("title", self.footnotes.getConfig("BACKLINK_TITLE").format(index))
new_list.append(item)
class FootnotePostprocessor(Postprocessor):
""" Replace placeholders with html entities. """
def __init__(self, footnotes: FootnoteExtension):
self.footnotes = footnotes
def run(self, text: str) -> str:
text = text.replace(
FN_BACKLINK_TEXT, self.footnotes.getConfig("BACKLINK_TEXT")
)
return text.replace(NBSP_PLACEHOLDER, " ")
def makeExtension(**kwargs): # pragma: no cover
""" Return an instance of the `FootnoteExtension` """
return FootnoteExtension(**kwargs)
You can’t perform that action at this time.