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"""
CodeHilite Extension for Python-Markdown
========================================

Adds code/syntax highlighting to standard Python-Markdown code blocks.

See <https://pythonhosted.org/Markdown/extensions/code_hilite.html>
for documentation.

Original code Copyright 2006-2008 [Waylan Limberg](http://achinghead.com/).

All changes Copyright 2008-2014 The Python Markdown Project

License: [BSD](http://www.opensource.org/licenses/bsd-license.php)

"""

from __future__ import absolute_import
from __future__ import unicode_literals
from . import Extension
from ..treeprocessors import Treeprocessor

try:
    from pygments import highlight
    from pygments.lexers import get_lexer_by_name, guess_lexer
    from pygments.formatters import get_formatter_by_name
    pygments = True
except ImportError:
    pygments = False


def parse_hl_lines(expr):
    """Support our syntax for emphasizing certain lines of code.

    expr should be like '1 2' to emphasize lines 1 and 2 of a code block.
    Returns a list of ints, the line numbers to emphasize.
    """
    if not expr:
        return []

    try:
        return list(map(int, expr.split()))
    except ValueError:
        return []


# ------------------ The Main CodeHilite Class ----------------------
class CodeHilite(object):
    """
    Determine language of source code, and pass it into pygments hilighter.

    Basic Usage:
        >>> code = CodeHilite(src = 'some text')
        >>> html = code.hilite()

    * src: Source string or any object with a .readline attribute.

    * linenums: (Boolean) Set line numbering to 'on' (True),
      'off' (False) or 'auto'(None). Set to 'auto' by default.

    * guess_lang: (Boolean) Turn language auto-detection
      'on' or 'off' (on by default).

    * css_class: Set class name of wrapper div ('codehilite' by default).

    * hl_lines: (List of integers) Lines to emphasize, 1-indexed.

    Low Level Usage:
        >>> code = CodeHilite()
        >>> code.src = 'some text' # String or anything with a .readline attr.
        >>> code.linenos = True  # Turns line numbering on or of.
        >>> html = code.hilite()

    """

    def __init__(self, src=None, linenums=None, guess_lang=True,
                 css_class="codehilite", lang=None, style='default',
                 noclasses=False, tab_length=4, hl_lines=None, use_pygments=True):
        self.src = src
        self.lang = lang
        self.linenums = linenums
        self.guess_lang = guess_lang
        self.css_class = css_class
        self.style = style
        self.noclasses = noclasses
        self.tab_length = tab_length
        self.hl_lines = hl_lines or []
        self.use_pygments = use_pygments

    def hilite(self):
        """
        Pass code to the [Pygments](http://pygments.pocoo.org/) highliter with
        optional line numbers. The output should then be styled with css to
        your liking. No styles are applied by default - only styling hooks
        (i.e.: <span class="k">).

        returns : A string of html.

        """

        self.src = self.src.strip('\n')

        if self.lang is None:
            self._parseHeader()

        if pygments and self.use_pygments:
            try:
                lexer = get_lexer_by_name(self.lang)
            except ValueError:
                try:
                    if self.guess_lang:
                        lexer = guess_lexer(self.src)
                    else:
                        lexer = get_lexer_by_name('text')
                except ValueError:
                    lexer = get_lexer_by_name('text')
            formatter = get_formatter_by_name('html',
                                              linenos=self.linenums,
                                              cssclass=self.css_class,
                                              style=self.style,
                                              noclasses=self.noclasses,
                                              hl_lines=self.hl_lines)
            return highlight(self.src, lexer, formatter)
        else:
            # just escape and build markup usable by JS highlighting libs
            txt = self.src.replace('&', '&amp;')
            txt = txt.replace('<', '&lt;')
            txt = txt.replace('>', '&gt;')
            txt = txt.replace('"', '&quot;')
            classes = []
            if self.lang:
                classes.append('language-%s' % self.lang)
            if self.linenums:
                classes.append('linenums')
            class_str = ''
            if classes:
                class_str = ' class="%s"' % ' '.join(classes)
            return '<pre class="%s"><code%s>%s</code></pre>\n' % \
                   (self.css_class, class_str, txt)

    def _parseHeader(self):
        """
        Determines language of a code block from shebang line and whether said
        line should be removed or left in place. If the sheband line contains a
        path (even a single /) then it is assumed to be a real shebang line and
        left alone. However, if no path is given (e.i.: #!python or :::python)
        then it is assumed to be a mock shebang for language identifitation of
        a code fragment and removed from the code block prior to processing for
        code highlighting. When a mock shebang (e.i: #!python) is found, line
        numbering is turned on. When colons are found in place of a shebang
        (e.i.: :::python), line numbering is left in the current state - off
        by default.

        Also parses optional list of highlight lines, like:

            :::python hl_lines="1 3"
        """

        import re

        # split text into lines
        lines = self.src.split("\n")
        # pull first line to examine
        fl = lines.pop(0)

        c = re.compile(r'''
            (?:(?:^::+)|(?P<shebang>^[#]!)) # Shebang or 2 or more colons
            (?P<path>(?:/\w+)*[/ ])?        # Zero or 1 path
            (?P<lang>[\w#.+-]*)             # The language
            \s*                             # Arbitrary whitespace
            # Optional highlight lines, single- or double-quote-delimited
            (hl_lines=(?P<quot>"|')(?P<hl_lines>.*?)(?P=quot))?
            ''',  re.VERBOSE)
        # search first line for shebang
        m = c.search(fl)
        if m:
            # we have a match
            try:
                self.lang = m.group('lang').lower()
            except IndexError:
                self.lang = None
            if m.group('path'):
                # path exists - restore first line
                lines.insert(0, fl)
            if self.linenums is None and m.group('shebang'):
                # Overridable and Shebang exists - use line numbers
                self.linenums = True

            self.hl_lines = parse_hl_lines(m.group('hl_lines'))
        else:
            # No match
            lines.insert(0, fl)

        self.src = "\n".join(lines).strip("\n")


# ------------------ The Markdown Extension -------------------------------


class HiliteTreeprocessor(Treeprocessor):
    """ Hilight source code in code blocks. """

    def run(self, root):
        """ Find code blocks and store in htmlStash. """
        blocks = root.iter('pre')
        for block in blocks:
            if len(block) == 1 and block[0].tag == 'code':
                code = CodeHilite(
                    block[0].text,
                    linenums=self.config['linenums'],
                    guess_lang=self.config['guess_lang'],
                    css_class=self.config['css_class'],
                    style=self.config['pygments_style'],
                    noclasses=self.config['noclasses'],
                    tab_length=self.markdown.tab_length,
                    use_pygments=self.config['use_pygments']
                )
                placeholder = self.markdown.htmlStash.store(code.hilite(),
                                                            safe=True)
                # Clear codeblock in etree instance
                block.clear()
                # Change to p element which will later
                # be removed when inserting raw html
                block.tag = 'p'
                block.text = placeholder


class CodeHiliteExtension(Extension):
    """ Add source code hilighting to markdown codeblocks. """

    def __init__(self, *args, **kwargs):
        # define default configs
        self.config = {
            'linenums': [None,
                         "Use lines numbers. True=yes, False=no, None=auto"],
            'guess_lang': [True,
                           "Automatic language detection - Default: True"],
            'css_class': ["codehilite",
                          "Set class name for wrapper <div> - "
                          "Default: codehilite"],
            'pygments_style': ['default',
                               'Pygments HTML Formatter Style '
                               '(Colorscheme) - Default: default'],
            'noclasses': [False,
                          'Use inline styles instead of CSS classes - '
                          'Default false'],
            'use_pygments': [True,
                             'Use Pygments to Highlight code blocks. '
                             'Disable if using a JavaScript library. '
                             'Default: True']
            }

        super(CodeHiliteExtension, self).__init__(*args, **kwargs)

    def extendMarkdown(self, md, md_globals):
        """ Add HilitePostprocessor to Markdown instance. """
        hiliter = HiliteTreeprocessor(md)
        hiliter.config = self.getConfigs()
        md.treeprocessors.add("hilite", hiliter, "<inline")

        md.registerExtension(self)


def makeExtension(*args, **kwargs):
    return CodeHiliteExtension(*args, **kwargs)

Filemanager

Name Type Size Permission Actions
__init__.py File 3.76 KB 0644
__init__.pyc File 4 KB 0644
abbr.py File 2.67 KB 0644
abbr.pyc File 4.14 KB 0644
admonition.py File 3.09 KB 0644
admonition.pyc File 3.66 KB 0644
attr_list.py File 6.12 KB 0644
attr_list.pyc File 6.21 KB 0644
codehilite.py File 9.54 KB 0644
codehilite.pyc File 9.3 KB 0644
def_list.py File 3.66 KB 0644
def_list.pyc File 4.31 KB 0644
extra.py File 5.42 KB 0644
extra.pyc File 5.57 KB 0644
fenced_code.py File 4.01 KB 0644
fenced_code.pyc File 4.45 KB 0644
footnotes.py File 14.57 KB 0644
footnotes.pyc File 14.79 KB 0644
headerid.py File 3.24 KB 0644
headerid.pyc File 4.23 KB 0644
meta.py File 2.34 KB 0644
meta.pyc File 2.95 KB 0644
nl2br.py File 859 B 0644
nl2br.pyc File 1.54 KB 0644
sane_lists.py File 1.56 KB 0644
sane_lists.pyc File 2.73 KB 0644
smart_strong.py File 1.17 KB 0644
smart_strong.pyc File 1.81 KB 0644
smarty.py File 10.12 KB 0644
smarty.pyc File 10.23 KB 0644
tables.py File 7.67 KB 0644
tables.pyc File 6.79 KB 0644
toc.py File 10.79 KB 0644
toc.pyc File 10.53 KB 0644
wikilinks.py File 2.8 KB 0644
wikilinks.pyc File 4.02 KB 0644