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#!/usr/bin/python
# :Author: the Pygments team; Felix Wiemann; Guenter Milde
# :Date: $Date$
# :Copyright: This module has been placed in the public domain.
#
# This is a merge of `Using Pygments in ReST documents`_ from the pygments_
# documentation, and a `proof of concept`_ by Felix Wiemann.
#
# .. class:: borderless
#
# ========== ===========================================================
# 2007-06-01 Removed redundancy from class values.
# 2007-06-04 Merge of successive tokens of same type
# (code taken from pygments.formatters.others).
# 2007-06-05 Separate docutils formatter script
# Use pygments' CSS class names (like the html formatter)
# allowing the use of pygments-produced style sheets.
# 2007-06-07 Merge in the formatting of the parsed tokens
# (misnamed as docutils_formatter) as class DocutilsInterface
# 2007-06-08 Failsave implementation (fallback to a standard literal block
# if pygments not found)
# ========== ===========================================================
#
# ::
"""Define and register a code-block directive using pygments
"""
# Requirements
# ------------
# ::
from docutils import nodes
from docutils.parsers.rst import directives
try:
import pygments
from pygments.lexers import get_lexer_by_name
from pygments.formatters.html import _get_ttype_class
except ImportError:
pass
# Customisation
# -------------
#
# Do not insert inline nodes for the following tokens.
# (You could add e.g. Token.Punctuation like ``['', 'p']``.) ::
unstyled_tokens = ['']
# DocutilsInterface
# -----------------
#
# This interface class combines code from
# pygments.formatters.html and pygments.formatters.others.
#
# It does not require anything of docutils and could also become a part of
# pygments::
class DocutilsInterface(object):
"""Parse `code` string and yield "classified" tokens.
Arguments
code -- string of source code to parse
language -- formal language the code is written in.
Merge subsequent tokens of the same token-type.
Yields the tokens as ``(ttype_class, value)`` tuples,
where ttype_class is taken from pygments.token.STANDARD_TYPES and
corresponds to the class argument used in pygments html output.
"""
def __init__(self, code, language):
self.code = code
self.language = language
def lex(self):
# Get lexer for language (use text as fallback)
try:
lexer = get_lexer_by_name(self.language)
except ValueError:
# info: "no pygments lexer for %s, using 'text'"%self.language
lexer = get_lexer_by_name('text')
return pygments.lex(self.code, lexer)
def join(self, tokens):
"""join subsequent tokens of same token-type
"""
tokens = iter(tokens)
(lasttype, lastval) = tokens.next()
for ttype, value in tokens:
if ttype is lasttype:
lastval += value
else:
yield(lasttype, lastval)
(lasttype, lastval) = (ttype, value)
yield(lasttype, lastval)
def __iter__(self):
"""parse code string and yield "clasified" tokens
"""
try:
tokens = self.lex()
except IOError:
print "INFO: Pygments lexer not found, using fallback"
# TODO: write message to INFO
yield ('', self.code)
return
for ttype, value in self.join(tokens):
yield (_get_ttype_class(ttype), value)
# code_block_directive
# --------------------
# ::
def code_block_directive(name, arguments, options, content, lineno,
content_offset, block_text, state, state_machine):
"""parse and classify content of a code_block
"""
language = arguments[0]
# create a literal block element and set class argument
code_block = nodes.literal_block(classes=["code-block", language])
# parse content with pygments and add to code_block element
for cls, value in DocutilsInterface(u'\n'.join(content), language):
if cls in unstyled_tokens:
# insert as Text to decrease the verbosity of the output.
code_block += nodes.Text(value, value)
else:
code_block += nodes.inline(value, value, classes=[cls])
return [code_block]
# Register Directive
# ------------------
# ::
code_block_directive.arguments = (1, 0, 1)
code_block_directive.content = 1
directives.register_directive('code-block', code_block_directive)
# .. _doctutils: http://docutils.sf.net/
# .. _pygments: http://pygments.org/
# .. _Using Pygments in ReST documents: http://pygments.org/docs/rstdirective/
# .. _proof of concept:
# http://article.gmane.org/gmane.text.docutils.user/3689
#
# Test output
# -----------
#
# If called from the command line, call the docutils publisher to render the
# input::
if __name__ == '__main__':
from docutils.core import publish_cmdline, default_description
description = "code-block directive test output" + default_description
try:
import locale
locale.setlocale(locale.LC_ALL, '')
except:
pass
# Uncomment the desired output format:
publish_cmdline(writer_name='pseudoxml', description=description)
# publish_cmdline(writer_name='xml', description=description)
# publish_cmdline(writer_name='html', description=description)
# publish_cmdline(writer_name='latex', description=description)
# publish_cmdline(writer_name='newlatex2e', description=description)
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