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-#!/usr/bin/python
-
-"""
-HeaderID Extension for Python-Markdown
-======================================
-
-Adds ability to set HTML IDs for headers.
-
-Basic usage:
-
- >>> import markdown
- >>> text = "# Some Header # {#some_id}"
- >>> md = markdown.markdown(text, ['headerid'])
- >>> md
- u'<h1 id="some_id">Some Header</h1>'
-
-All header IDs are unique:
-
- >>> text = '''
- ... #Header
- ... #Another Header {#header}
- ... #Third Header {#header}'''
- >>> md = markdown.markdown(text, ['headerid'])
- >>> md
- u'<h1 id="header">Header</h1>\\n\\n<h1 id="header_1">Another Header</h1>\\n\\n<h1 id="header_2">Third Header</h1>'
-
-To fit within a html template's hierarchy, set the header base level:
-
- >>> text = '''
- ... #Some Header
- ... ## Next Level'''
- >>> md = markdown.markdown(text, ['headerid(level=3)'])
- >>> md
- u'<h3 id="some_header">Some Header</h3>\\n\\n<h4 id="next_level">Next Level</h4>'
-
-Turn off auto generated IDs:
-
- >>> text = '''
- ... # Some Header
- ... # Header with ID # { #foo }'''
- >>> md = markdown.markdown(text, ['headerid(forceid=False)'])
- >>> md
- u'<h1>Some Header</h1>\\n\\n<h1 id="foo">Header with ID</h1>'
-
-Use with MetaData extension:
-
- >>> text = '''header_level: 2
- ... header_forceid: Off
- ...
- ... # A Header'''
- >>> md = markdown.markdown(text, ['headerid', 'meta'])
- >>> md
- u'<h2>A Header</h2>'
-
-By [Waylan Limberg](http://achinghead.com/).
-
-Project website: http://achinghead.com/markdown-headerid/
-Contact: waylan [at] gmail [dot] com
-
-License: [BSD](http://www.opensource.org/licenses/bsd-license.php)
-
-Version: 0.1 (May 2, 2008)
-
-Dependencies:
-* [Python 2.3+](http://python.org)
-* [Markdown 1.7+](http://www.freewisdom.org/projects/python-markdown/)
-
-"""
-
-import markdown
-from markdown import etree
-import re
-from string import ascii_lowercase, digits, punctuation
-
-ID_CHARS = ascii_lowercase + digits + '-_'
-
-HEADER_RE = re.compile(r'''^(\#{1,6}) # group(1) = string of hashes
- ( [^{^#]*) # group(2) = Header text
- [\#]* # optional closing hashes (not counted)
- (?:[ \t]*\{[ \t]*\#([-_:a-zA-Z0-9]+)[ \t]*\})? # group(3) = id attr''',
- re.VERBOSE)
-
-IDCOUNT_RE = re.compile(r'^(.*)_([0-9]+)$')
-
-class HeaderIdExtension (markdown.Extension) :
- def __init__(self, configs):
- # set defaults
- self.config = {
- 'level' : ['1', 'Base level for headers.'],
- 'forceid' : ['True', 'Force all headers to have an id.']
- }
-
- for key, value in configs:
- self.setConfig(key, value)
-
-
- def extendMarkdown(self, md, md_globals) :
-
- md.IDs = []
-
- def _processHeaderId(parent_elem, paragraph) :
- '''
- Overrides _processHeader of Markdown() and
- adds an 'id' to the header.
- '''
- m = HEADER_RE.match(paragraph[0])
- if m :
- start_level, force_id = _get_meta()
- level = len(m.group(1)) + start_level
- if level > 6:
- level = 6
- h = etree.Element("h%d" % level)
- parent_elem.append(h)
- inline = etree.SubElement(h, "inline")
- inline.text = m.group(2).strip()
- if m.group(3) :
- h.set('id', _unique_id(m.group(3)))
- elif force_id:
- h.set('id', _create_id(m.group(2).strip()))
- else :
- message(CRITICAL, "We've got a problem header!")
-
- md._processHeader = _processHeaderId
-
- def _get_meta():
- ''' Return meta data suported by this ext as a tuple '''
- level = int(self.config['level'][0]) - 1
- force = _str2bool(self.config['forceid'][0])
- if hasattr(md, 'Meta'):
- if md.Meta.has_key('header_level'):
- level = int(md.Meta['header_level'][0]) - 1
- if md.Meta.has_key('header_forceid'):
- force = _str2bool(md.Meta['header_forceid'][0])
- return level, force
-
- def _str2bool(s, default=False):
- ''' Convert a string to a booleen value. '''
- s = str(s)
- if s.lower() in ['0', 'f', 'false', 'off', 'no', 'n']:
- return False
- elif s.lower() in ['1', 't', 'true', 'on', 'yes', 'y']:
- return True
- return default
-
- def _unique_id(id):
- ''' Ensure ID is unique. Append '_1', '_2'... if not '''
- while id in md.IDs:
- m = IDCOUNT_RE.match(id)
- if m:
- id = '%s_%d'% (m.group(1), int(m.group(2))+1)
- else:
- id = '%s_%d'% (id, 1)
- md.IDs.append(id)
- return id
-
-
- def _create_id(header):
- ''' Return ID from Header text. '''
- h = ''
- for c in header.lower().replace(' ', '_'):
- if c in ID_CHARS:
- h += c
- elif c not in punctuation:
- h += '+'
- return _unique_id(h)
-
-
-
-def makeExtension(configs=None) :
- return HeaderIdExtension(configs=configs)
-
-if __name__ == "__main__":
- import doctest
- doctest.testmod()
-