258 lines
9.8 KiB
Python
258 lines
9.8 KiB
Python
'''
|
||
Smarty extension for Python-Markdown
|
||
====================================
|
||
|
||
Adds conversion of ASCII dashes, quotes and ellipses to their HTML
|
||
entity equivalents.
|
||
|
||
See <https://Python-Markdown.github.io/extensions/smarty>
|
||
for documentation.
|
||
|
||
Author: 2013, Dmitry Shachnev <mitya57@gmail.com>
|
||
|
||
All changes Copyright 2013-2014 The Python Markdown Project
|
||
|
||
License: [BSD](https://opensource.org/licenses/bsd-license.php)
|
||
|
||
SmartyPants license:
|
||
|
||
Copyright (c) 2003 John Gruber <https://daringfireball.net/>
|
||
All rights reserved.
|
||
|
||
Redistribution and use in source and binary forms, with or without
|
||
modification, are permitted provided that the following conditions are
|
||
met:
|
||
|
||
* Redistributions of source code must retain the above copyright
|
||
notice, this list of conditions and the following disclaimer.
|
||
|
||
* Redistributions in binary form must reproduce the above copyright
|
||
notice, this list of conditions and the following disclaimer in
|
||
the documentation and/or other materials provided with the
|
||
distribution.
|
||
|
||
* Neither the name "SmartyPants" nor the names of its contributors
|
||
may be used to endorse or promote products derived from this
|
||
software without specific prior written permission.
|
||
|
||
This software is provided by the copyright holders and contributors "as
|
||
is" and any express or implied warranties, including, but not limited
|
||
to, the implied warranties of merchantability and fitness for a
|
||
particular purpose are disclaimed. In no event shall the copyright
|
||
owner or contributors be liable for any direct, indirect, incidental,
|
||
special, exemplary, or consequential damages (including, but not
|
||
limited to, procurement of substitute goods or services; loss of use,
|
||
data, or profits; or business interruption) however caused and on any
|
||
theory of liability, whether in contract, strict liability, or tort
|
||
(including negligence or otherwise) arising in any way out of the use
|
||
of this software, even if advised of the possibility of such damage.
|
||
|
||
|
||
`smartypants.py` license:
|
||
|
||
`smartypants.py` is a derivative work of SmartyPants.
|
||
Copyright (c) 2004, 2007 Chad Miller <http://web.chad.org/>
|
||
|
||
Redistribution and use in source and binary forms, with or without
|
||
modification, are permitted provided that the following conditions are
|
||
met:
|
||
|
||
* Redistributions of source code must retain the above copyright
|
||
notice, this list of conditions and the following disclaimer.
|
||
|
||
* Redistributions in binary form must reproduce the above copyright
|
||
notice, this list of conditions and the following disclaimer in
|
||
the documentation and/or other materials provided with the
|
||
distribution.
|
||
|
||
This software is provided by the copyright holders and contributors "as
|
||
is" and any express or implied warranties, including, but not limited
|
||
to, the implied warranties of merchantability and fitness for a
|
||
particular purpose are disclaimed. In no event shall the copyright
|
||
owner or contributors be liable for any direct, indirect, incidental,
|
||
special, exemplary, or consequential damages (including, but not
|
||
limited to, procurement of substitute goods or services; loss of use,
|
||
data, or profits; or business interruption) however caused and on any
|
||
theory of liability, whether in contract, strict liability, or tort
|
||
(including negligence or otherwise) arising in any way out of the use
|
||
of this software, even if advised of the possibility of such damage.
|
||
|
||
'''
|
||
|
||
|
||
from . import Extension
|
||
from ..inlinepatterns import HtmlInlineProcessor, HTML_RE
|
||
from ..treeprocessors import InlineProcessor
|
||
from ..util import Registry
|
||
|
||
|
||
# Constants for quote education.
|
||
punctClass = r"""[!"#\$\%'()*+,-.\/:;<=>?\@\[\\\]\^_`{|}~]"""
|
||
endOfWordClass = r"[\s.,;:!?)]"
|
||
closeClass = r"[^\ \t\r\n\[\{\(\-\u0002\u0003]"
|
||
|
||
openingQuotesBase = (
|
||
r'(\s' # a whitespace char
|
||
r'| ' # or a non-breaking space entity
|
||
r'|--' # or dashes
|
||
r'|–|—' # or Unicode
|
||
r'|&[mn]dash;' # or named dash entities
|
||
r'|–|—' # or decimal entities
|
||
r')'
|
||
)
|
||
|
||
substitutions = {
|
||
'mdash': '—',
|
||
'ndash': '–',
|
||
'ellipsis': '…',
|
||
'left-angle-quote': '«',
|
||
'right-angle-quote': '»',
|
||
'left-single-quote': '‘',
|
||
'right-single-quote': '’',
|
||
'left-double-quote': '“',
|
||
'right-double-quote': '”',
|
||
}
|
||
|
||
|
||
# Special case if the very first character is a quote
|
||
# followed by punctuation at a non-word-break. Close the quotes by brute force:
|
||
singleQuoteStartRe = r"^'(?=%s\B)" % punctClass
|
||
doubleQuoteStartRe = r'^"(?=%s\B)' % punctClass
|
||
|
||
# Special case for double sets of quotes, e.g.:
|
||
# <p>He said, "'Quoted' words in a larger quote."</p>
|
||
doubleQuoteSetsRe = r""""'(?=\w)"""
|
||
singleQuoteSetsRe = r"""'"(?=\w)"""
|
||
|
||
# Special case for decade abbreviations (the '80s):
|
||
decadeAbbrRe = r"(?<!\w)'(?=\d{2}s)"
|
||
|
||
# Get most opening double quotes:
|
||
openingDoubleQuotesRegex = r'%s"(?=\w)' % openingQuotesBase
|
||
|
||
# Double closing quotes:
|
||
closingDoubleQuotesRegex = r'"(?=\s)'
|
||
closingDoubleQuotesRegex2 = '(?<=%s)"' % closeClass
|
||
|
||
# Get most opening single quotes:
|
||
openingSingleQuotesRegex = r"%s'(?=\w)" % openingQuotesBase
|
||
|
||
# Single closing quotes:
|
||
closingSingleQuotesRegex = r"(?<=%s)'(?!\s|s\b|\d)" % closeClass
|
||
closingSingleQuotesRegex2 = r"'(\s|s\b)"
|
||
|
||
# All remaining quotes should be opening ones
|
||
remainingSingleQuotesRegex = r"'"
|
||
remainingDoubleQuotesRegex = r'"'
|
||
|
||
HTML_STRICT_RE = HTML_RE + r'(?!\>)'
|
||
|
||
|
||
class SubstituteTextPattern(HtmlInlineProcessor):
|
||
def __init__(self, pattern, replace, md):
|
||
""" Replaces matches with some text. """
|
||
HtmlInlineProcessor.__init__(self, pattern)
|
||
self.replace = replace
|
||
self.md = md
|
||
|
||
def handleMatch(self, m, data):
|
||
result = ''
|
||
for part in self.replace:
|
||
if isinstance(part, int):
|
||
result += m.group(part)
|
||
else:
|
||
result += self.md.htmlStash.store(part)
|
||
return result, m.start(0), m.end(0)
|
||
|
||
|
||
class SmartyExtension(Extension):
|
||
def __init__(self, **kwargs):
|
||
self.config = {
|
||
'smart_quotes': [True, 'Educate quotes'],
|
||
'smart_angled_quotes': [False, 'Educate angled quotes'],
|
||
'smart_dashes': [True, 'Educate dashes'],
|
||
'smart_ellipses': [True, 'Educate ellipses'],
|
||
'substitutions': [{}, 'Overwrite default substitutions'],
|
||
}
|
||
super().__init__(**kwargs)
|
||
self.substitutions = dict(substitutions)
|
||
self.substitutions.update(self.getConfig('substitutions', default={}))
|
||
|
||
def _addPatterns(self, md, patterns, serie, priority):
|
||
for ind, pattern in enumerate(patterns):
|
||
pattern += (md,)
|
||
pattern = SubstituteTextPattern(*pattern)
|
||
name = 'smarty-%s-%d' % (serie, ind)
|
||
self.inlinePatterns.register(pattern, name, priority-ind)
|
||
|
||
def educateDashes(self, md):
|
||
emDashesPattern = SubstituteTextPattern(
|
||
r'(?<!-)---(?!-)', (self.substitutions['mdash'],), md
|
||
)
|
||
enDashesPattern = SubstituteTextPattern(
|
||
r'(?<!-)--(?!-)', (self.substitutions['ndash'],), md
|
||
)
|
||
self.inlinePatterns.register(emDashesPattern, 'smarty-em-dashes', 50)
|
||
self.inlinePatterns.register(enDashesPattern, 'smarty-en-dashes', 45)
|
||
|
||
def educateEllipses(self, md):
|
||
ellipsesPattern = SubstituteTextPattern(
|
||
r'(?<!\.)\.{3}(?!\.)', (self.substitutions['ellipsis'],), md
|
||
)
|
||
self.inlinePatterns.register(ellipsesPattern, 'smarty-ellipses', 10)
|
||
|
||
def educateAngledQuotes(self, md):
|
||
leftAngledQuotePattern = SubstituteTextPattern(
|
||
r'\<\<', (self.substitutions['left-angle-quote'],), md
|
||
)
|
||
rightAngledQuotePattern = SubstituteTextPattern(
|
||
r'\>\>', (self.substitutions['right-angle-quote'],), md
|
||
)
|
||
self.inlinePatterns.register(leftAngledQuotePattern, 'smarty-left-angle-quotes', 40)
|
||
self.inlinePatterns.register(rightAngledQuotePattern, 'smarty-right-angle-quotes', 35)
|
||
|
||
def educateQuotes(self, md):
|
||
lsquo = self.substitutions['left-single-quote']
|
||
rsquo = self.substitutions['right-single-quote']
|
||
ldquo = self.substitutions['left-double-quote']
|
||
rdquo = self.substitutions['right-double-quote']
|
||
patterns = (
|
||
(singleQuoteStartRe, (rsquo,)),
|
||
(doubleQuoteStartRe, (rdquo,)),
|
||
(doubleQuoteSetsRe, (ldquo + lsquo,)),
|
||
(singleQuoteSetsRe, (lsquo + ldquo,)),
|
||
(decadeAbbrRe, (rsquo,)),
|
||
(openingSingleQuotesRegex, (1, lsquo)),
|
||
(closingSingleQuotesRegex, (rsquo,)),
|
||
(closingSingleQuotesRegex2, (rsquo, 1)),
|
||
(remainingSingleQuotesRegex, (lsquo,)),
|
||
(openingDoubleQuotesRegex, (1, ldquo)),
|
||
(closingDoubleQuotesRegex, (rdquo,)),
|
||
(closingDoubleQuotesRegex2, (rdquo,)),
|
||
(remainingDoubleQuotesRegex, (ldquo,))
|
||
)
|
||
self._addPatterns(md, patterns, 'quotes', 30)
|
||
|
||
def extendMarkdown(self, md):
|
||
configs = self.getConfigs()
|
||
self.inlinePatterns = Registry()
|
||
if configs['smart_ellipses']:
|
||
self.educateEllipses(md)
|
||
if configs['smart_quotes']:
|
||
self.educateQuotes(md)
|
||
if configs['smart_angled_quotes']:
|
||
self.educateAngledQuotes(md)
|
||
# Override `HTML_RE` from `inlinepatterns.py` so that it does not
|
||
# process tags with duplicate closing quotes.
|
||
md.inlinePatterns.register(HtmlInlineProcessor(HTML_STRICT_RE, md), 'html', 90)
|
||
if configs['smart_dashes']:
|
||
self.educateDashes(md)
|
||
inlineProcessor = InlineProcessor(md)
|
||
inlineProcessor.inlinePatterns = self.inlinePatterns
|
||
md.treeprocessors.register(inlineProcessor, 'smarty', 2)
|
||
md.ESCAPED_CHARS.extend(['"', "'"])
|
||
|
||
|
||
def makeExtension(**kwargs): # pragma: no cover
|
||
return SmartyExtension(**kwargs)
|