Fixes for Android GN build input/outputs
[chromium-blink-merge.git] / third_party / markdown / extensions / attr_list.py
blob43482a1d9d79573580b5be5ddefad10b4d1acb50
1 # markdown is released under the BSD license
2 # Copyright 2007, 2008 The Python Markdown Project (v. 1.7 and later)
3 # Copyright 2004, 2005, 2006 Yuri Takhteyev (v. 0.2-1.6b)
4 # Copyright 2004 Manfred Stienstra (the original version)
5 #
6 # All rights reserved.
7 #
8 # Redistribution and use in source and binary forms, with or without
9 # modification, are permitted provided that the following conditions are met:
11 # * Redistributions of source code must retain the above copyright
12 # notice, this list of conditions and the following disclaimer.
13 # * Redistributions in binary form must reproduce the above copyright
14 # notice, this list of conditions and the following disclaimer in the
15 # documentation and/or other materials provided with the distribution.
16 # * Neither the name of the <organization> nor the
17 # names of its contributors may be used to endorse or promote products
18 # derived from this software without specific prior written permission.
20 # THIS SOFTWARE IS PROVIDED BY THE PYTHON MARKDOWN PROJECT ''AS IS'' AND ANY
21 # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
22 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
23 # DISCLAIMED. IN NO EVENT SHALL ANY CONTRIBUTORS TO THE PYTHON MARKDOWN PROJECT
24 # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 # POSSIBILITY OF SUCH DAMAGE.
33 """
34 Attribute List Extension for Python-Markdown
35 ============================================
37 Adds attribute list syntax. Inspired by
38 [maruku](http://maruku.rubyforge.org/proposal.html#attribute_lists)'s
39 feature of the same name.
41 Copyright 2011 [Waylan Limberg](http://achinghead.com/).
43 Contact: markdown@freewisdom.org
45 License: BSD (see ../LICENSE.md for details)
47 Dependencies:
48 * [Python 2.4+](http://python.org)
49 * [Markdown 2.1+](http://packages.python.org/Markdown/)
51 """
53 from __future__ import absolute_import
54 from __future__ import unicode_literals
55 from . import Extension
56 from ..treeprocessors import Treeprocessor
57 from ..util import isBlockLevel
58 import re
60 try:
61 Scanner = re.Scanner
62 except AttributeError:
63 # must be on Python 2.4
64 from sre import Scanner
66 def _handle_double_quote(s, t):
67 k, v = t.split('=')
68 return k, v.strip('"')
70 def _handle_single_quote(s, t):
71 k, v = t.split('=')
72 return k, v.strip("'")
74 def _handle_key_value(s, t):
75 return t.split('=')
77 def _handle_word(s, t):
78 if t.startswith('.'):
79 return '.', t[1:]
80 if t.startswith('#'):
81 return 'id', t[1:]
82 return t, t
84 _scanner = Scanner([
85 (r'[^ ]+=".*?"', _handle_double_quote),
86 (r"[^ ]+='.*?'", _handle_single_quote),
87 (r'[^ ]+=[^ ]*', _handle_key_value),
88 (r'[^ ]+', _handle_word),
89 (r' ', None)
92 def get_attrs(str):
93 """ Parse attribute list and return a list of attribute tuples. """
94 return _scanner.scan(str)[0]
96 def isheader(elem):
97 return elem.tag in ['h1', 'h2', 'h3', 'h4', 'h5', 'h6']
99 class AttrListTreeprocessor(Treeprocessor):
101 BASE_RE = r'\{\:?([^\}]*)\}'
102 HEADER_RE = re.compile(r'[ ]*%s[ ]*$' % BASE_RE)
103 BLOCK_RE = re.compile(r'\n[ ]*%s[ ]*$' % BASE_RE)
104 INLINE_RE = re.compile(r'^%s' % BASE_RE)
105 NAME_RE = re.compile(r'[^A-Z_a-z\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u02ff\u0370-\u037d'
106 r'\u037f-\u1fff\u200c-\u200d\u2070-\u218f\u2c00-\u2fef'
107 r'\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd'
108 r'\:\-\.0-9\u00b7\u0300-\u036f\u203f-\u2040]+')
110 def run(self, doc):
111 for elem in doc.getiterator():
112 if isBlockLevel(elem.tag):
113 # Block level: check for attrs on last line of text
114 RE = self.BLOCK_RE
115 if isheader(elem):
116 # header: check for attrs at end of line
117 RE = self.HEADER_RE
118 if len(elem) and elem[-1].tail:
119 # has children. Get from tail of last child
120 m = RE.search(elem[-1].tail)
121 if m:
122 self.assign_attrs(elem, m.group(1))
123 elem[-1].tail = elem[-1].tail[:m.start()]
124 if isheader(elem):
125 # clean up trailing #s
126 elem[-1].tail = elem[-1].tail.rstrip('#').rstrip()
127 elif elem.text:
128 # no children. Get from text.
129 m = RE.search(elem.text)
130 if m:
131 self.assign_attrs(elem, m.group(1))
132 elem.text = elem.text[:m.start()]
133 if isheader(elem):
134 # clean up trailing #s
135 elem.text = elem.text.rstrip('#').rstrip()
136 else:
137 # inline: check for attrs at start of tail
138 if elem.tail:
139 m = self.INLINE_RE.match(elem.tail)
140 if m:
141 self.assign_attrs(elem, m.group(1))
142 elem.tail = elem.tail[m.end():]
144 def assign_attrs(self, elem, attrs):
145 """ Assign attrs to element. """
146 for k, v in get_attrs(attrs):
147 if k == '.':
148 # add to class
149 cls = elem.get('class')
150 if cls:
151 elem.set('class', '%s %s' % (cls, v))
152 else:
153 elem.set('class', v)
154 else:
155 # assign attr k with v
156 elem.set(self.sanitize_name(k), v)
158 def sanitize_name(self, name):
160 Sanitize name as 'an XML Name, minus the ":"'.
161 See http://www.w3.org/TR/REC-xml-names/#NT-NCName
163 return self.NAME_RE.sub('_', name)
166 class AttrListExtension(Extension):
167 def extendMarkdown(self, md, md_globals):
168 md.treeprocessors.add('attr_list', AttrListTreeprocessor(md), '>prettify')
171 def makeExtension(configs={}):
172 return AttrListExtension(configs=configs)