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#! /usr/bin/env python2
# -*- coding: utf-8 -*-
"""
PygmenTeX
~~~~~~~~~
PygmenTeX is a converter that do syntax highlighting of snippets of
source code extracted from a LaTeX file.
:copyright: Copyright 2014 by José Romildo Malaquias
:license: BSD, see LICENSE for details
"""
__version__ = '0.8'
__docformat__ = 'restructuredtext'
import sys
import getopt
import re
from os.path import splitext
from pygments import highlight
from pygments.styles import get_style_by_name
from pygments.lexers import get_lexer_by_name
from pygments.formatters.latex import LatexFormatter, escape_tex, _get_ttype_name
from pygments.util import get_bool_opt, get_int_opt
from pygments.lexer import Lexer
from pygments.token import Token
###################################################
# The following code is in >=pygments-2.0
###################################################
class EnhancedLatexFormatter(LatexFormatter):
r"""
This is an enhanced LaTeX formatter.
"""
name = 'EnhancedLaTeX'
aliases = []
def __init__(self, **options):
LatexFormatter.__init__(self, **options)
self.escapeinside = options.get('escapeinside', '')
if len(self.escapeinside) == 2:
self.left = self.escapeinside[0]
self.right = self.escapeinside[1]
else:
self.escapeinside = ''
def format_unencoded(self, tokensource, outfile):
# TODO: add support for background colors
t2n = self.ttype2name
cp = self.commandprefix
if self.full:
realoutfile = outfile
outfile = StringIO()
outfile.write(u'\\begin{Verbatim}[commandchars=\\\\\\{\\}')
if self.linenos:
start, step = self.linenostart, self.linenostep
outfile.write(u',numbers=left' +
(start and u',firstnumber=%d' % start or u'') +
(step and u',stepnumber=%d' % step or u''))
if self.mathescape or self.texcomments or self.escapeinside:
outfile.write(u',codes={\\catcode`\\$=3\\catcode`\\^=7\\catcode`\\_=8}')
if self.verboptions:
outfile.write(u',' + self.verboptions)
outfile.write(u']\n')
for ttype, value in tokensource:
if ttype in Token.Comment:
if self.texcomments:
# Try to guess comment starting lexeme and escape it ...
start = value[0:1]
for i in xrange(1, len(value)):
if start[0] != value[i]:
break
start += value[i]
value = value[len(start):]
start = escape_tex(start, self.commandprefix)
# ... but do not escape inside comment.
value = start + value
elif self.mathescape:
# Only escape parts not inside a math environment.
parts = value.split('$')
in_math = False
for i, part in enumerate(parts):
if not in_math:
parts[i] = escape_tex(part, self.commandprefix)
in_math = not in_math
value = '$'.join(parts)
elif self.escapeinside:
text = value
value = ''
while len(text) > 0:
a,sep1,text = text.partition(self.left)
if len(sep1) > 0:
b,sep2,text = text.partition(self.right)
if len(sep2) > 0:
value += escape_tex(a, self.commandprefix) + b
else:
value += escape_tex(a + sep1 + b, self.commandprefix)
else:
value = value + escape_tex(a, self.commandprefix)
else:
value = escape_tex(value, self.commandprefix)
elif ttype not in Token.Escape:
value = escape_tex(value, self.commandprefix)
styles = []
while ttype is not Token:
try:
styles.append(t2n[ttype])
except KeyError:
# not in current style
styles.append(_get_ttype_name(ttype))
ttype = ttype.parent
styleval = '+'.join(reversed(styles))
if styleval:
spl = value.split('\n')
for line in spl[:-1]:
if line:
outfile.write("\\%s{%s}{%s}" % (cp, styleval, line))
outfile.write('\n')
if spl[-1]:
outfile.write("\\%s{%s}{%s}" % (cp, styleval, spl[-1]))
else:
outfile.write(value)
outfile.write(u'\\end{Verbatim}\n')
if self.full:
realoutfile.write(DOC_TEMPLATE %
dict(docclass = self.docclass,
preamble = self.preamble,
title = self.title,
encoding = self.encoding or 'latin1',
styledefs = self.get_style_defs(),
code = outfile.getvalue()))
class LatexEmbeddedLexer(Lexer):
r"""
This lexer takes one lexer as argument, the lexer for the language
being formatted, and the left and right delimiters for escaped text.
First everything is scanned using the language lexer to obtain
strings and comments. All other consecutive tokens are merged and
the resulting text is scanned for escaped segments, which are given
the Token.Escape type. Finally text that is not escaped is scanned
again with the language lexer.
"""
def __init__(self, left, right, lang, **options):
self.left = left
self.right = right
self.lang = lang
Lexer.__init__(self, **options)
def get_tokens_unprocessed(self, text):
buf = ''
for i, t, v in self.lang.get_tokens_unprocessed(text):
if t in Token.Comment or t in Token.String:
if buf:
for x in self.get_tokens_aux(idx, buf):
yield x
buf = ''
yield i, t, v
else:
if not buf:
idx = i
buf += v
if buf:
for x in self.get_tokens_aux(idx, buf):
yield x
def get_tokens_aux(self, index, text):
while text:
a, sep1, text = text.partition(self.left)
if a:
for i, t, v in self.lang.get_tokens_unprocessed(a):
yield index + i, t, v
index += len(a)
if sep1:
b, sep2, text = text.partition(self.right)
if sep2:
yield index + len(sep1), Token.Escape, b
index += len(sep1) + len(b) + len(sep2)
else:
yield index, Token.Error, sep1
index += len(sep1)
text = b
###################################################
GENERIC_DEFINITIONS_1 = r'''% -*- mode: latex -*-
\makeatletter
\newdimen\LineNumberWidth
'''
GENERIC_DEFINITIONS_2 = r'''
\makeatother
'''
INLINE_SNIPPET_TEMPLATE = r'''
\expandafter\def\csname pygmented@snippet@%(number)s\endcsname{%%
\pygmented@snippet@inlined{%%
%(body)s%%
}}
'''
DISPLAY_SNIPPET_TEMPLATE = r'''
\expandafter\def\csname pygmented@snippet@%(number)s\endcsname{%%
\begin{pygmented@snippet@framed}%%
%(body)s%%
\end{pygmented@snippet@framed}%%
}
'''
DISPLAY_LINENOS_SNIPPET_TEMPLATE = r'''
\expandafter\def\csname pygmented@snippet@%(number)s\endcsname{%%
\begingroup
\def\pygmented@alllinenos{(%(linenumbers)s)}%%
\begin{pygmented@snippet@framed}%%
%(body)s%%
\end{pygmented@snippet@framed}%%
\endgroup
}
'''
def pyg(outfile, n, opts, extra_opts, text, usedstyles, inline_delim = ''):
try:
lexer = get_lexer_by_name(opts['lang'])
except ClassNotFound as err:
sys.stderr.write('Error: ')
sys.stderr.write(str(err))
return ""
# global _fmter
_fmter = EnhancedLatexFormatter()
escapeinside = opts.get('escapeinside', '')
if len(escapeinside) == 2:
left = escapeinside[0]
right = escapeinside[1]
_fmter.escapeinside = escapeinside
_fmter.left = left
_fmter.right = right
lexer = LatexEmbeddedLexer(left, right, lexer)
gobble = abs(get_int_opt(opts, 'gobble', 0))
if gobble:
lexer.add_filter('gobble', n=gobble)
tabsize = abs(get_int_opt(opts, 'tabsize', 0))
if tabsize:
lexer.tabsize = tabsize
encoding = opts['encoding']
if encoding == 'guess':
try:
import chardet
except ImportError:
try:
text = text.decode('utf-8')
if text.startswith(u'\ufeff'):
text = text[len(u'\ufeff'):]
encoding = 'utf-8'
except UnicodeDecodeError:
text = text.decode('latin1')
encoding = 'latin1'
else:
encoding = chardet.detect(text)['encoding']
text = text.decode(encoding)
else:
text = text.decode(encoding)
lexer.encoding = ''
_fmter.encoding = encoding
stylename = opts['sty']
_fmter.style = get_style_by_name(stylename)
_fmter._create_stylesheet()
_fmter.texcomments = get_bool_opt(opts, 'texcomments', False)
_fmter.mathescape = get_bool_opt(opts, 'mathescape', False)
if stylename not in usedstyles:
styledefs = _fmter.get_style_defs() \
.replace('#', '##') \
.replace(r'\##', r'\#') \
.replace(r'\makeatletter', '') \
.replace(r'\makeatother', '') \
.replace('\n', '%\n')
outfile.write(
'\\def\\PYstyle{0}{{%\n{1}%\n}}%\n'.format(stylename, styledefs))
usedstyles.append(stylename)
x = highlight(text, lexer, _fmter)
m = re.match(r'\\begin\{Verbatim}(.*)\n([\s\S]*?)\n\\end\{Verbatim}(\s*)\Z',
x)
if m:
linenos = get_bool_opt(opts, 'linenos', False)
linenostart = abs(get_int_opt(opts, 'linenostart', 1))
linenostep = abs(get_int_opt(opts, 'linenostep', 1))
lines0 = m.group(2).split('\n')
numbers = []
lines = []
counter = linenostart
for line in lines0:
line = re.sub(r'^ ', r'\\makebox[0pt]{\\phantom{Xy}} ', line)
line = re.sub(r' ', '~', line)
if linenos:
if (counter - linenostart) % linenostep == 0:
line = r'\pygmented@lineno@do{' + str(counter) + '}' + line
numbers.append(str(counter))
counter = counter + 1
lines.append(line)
if inline_delim:
outfile.write(INLINE_SNIPPET_TEMPLATE %
dict(number = n,
style = stylename,
options = extra_opts,
body = '\\newline\n'.join(lines)))
else:
if linenos:
template = DISPLAY_LINENOS_SNIPPET_TEMPLATE
else:
template = DISPLAY_SNIPPET_TEMPLATE
outfile.write(template %
dict(number = n,
style = stylename,
options = extra_opts,
linenosep = opts['linenosep'],
linenumbers = ','.join(numbers),
body = '\\newline\n'.join(lines)))
def parse_opts(basedic, opts):
dic = basedic.copy()
for opt in re.split(r'\s*,\s*', opts):
x = re.split(r'\s*=\s*', opt)
if len(x) == 2 and x[0] and x[1]:
dic[x[0]] = x[1]
elif len(x) == 1 and x[0]:
dic[x[0]] = True
return dic
_re_display = re.compile(
r'^<@@pygmented@display@(\d+)\n(.*)\n([\s\S]*?)\n>@@pygmented@display@\1$',
re.MULTILINE)
_re_inline = re.compile(
r'^<@@pygmented@inline@(\d+)\n(.*)\n([\s\S]*?)\n>@@pygmented@inline@\1$',
re.MULTILINE)
_re_input = re.compile(
r'^<@@pygmented@input@(\d+)\n(.*)\n([\s\S]*?)\n>@@pygmented@input@\1$',
re.MULTILINE)
def convert(code, outfile):
"""
Convert ``code``
"""
outfile.write(GENERIC_DEFINITIONS_1)
opts = { 'lang' : 'c',
'sty' : 'default',
'linenosep' : '0pt',
'tabsize' : '8',
'encoding' : 'guess',
}
usedstyles = [ ]
styledefs = ''
pos = 0
while pos < len(code):
if code[pos].isspace():
pos = pos + 1
continue
m = _re_inline.match(code, pos)
if m:
pyg(outfile,
m.group(1),
parse_opts(opts.copy(), m.group(2)),
'',
m.group(3),
usedstyles,
True)
pos = m.end()
continue
m = _re_display.match(code, pos)
if m:
pyg(outfile,
m.group(1),
parse_opts(opts.copy(), m.group(2)),
'',
m.group(3),
usedstyles)
pos = m.end()
continue
m = _re_input.match(code, pos)
if m:
try:
filecontents = open(m.group(3), 'rb').read()
except Exception as err:
sys.stderr.write('Error: cannot read input file: ')
sys.stderr.write(str(err))
else:
pyg(outfile,
m.group(1),
parse_opts(opts, m.group(2)),
"",
filecontents,
usedstyles)
pos = m.end()
continue
sys.stderr.write('Error: invalid input file contents: ignoring')
break
outfile.write(GENERIC_DEFINITIONS_2)
USAGE = """\
Usage: %s [-o <output file name>] <input file name>
%s -h | -V
The input file should consist of a sequence of source code snippets, as
produced by the `pygmentex` LaTeX package. Each code snippet is
highlighted using Pygments, and a LaTeX command that expands to the
highlighted code snippet is written to the output file.
It also writes to the output file a set of LaTeX macro definitions the
Pygments styles that are used in the code snippets.
If no output file name is given, use `<input file name>.pygmented`.
The -e option enables escaping to LaTex. Text delimited by the <left>
and <right> characters is read as LaTeX code and typeset accordingly. It
has no effect in string literals. It has no effect in comments if
`texcomments` or `mathescape` is set.
The -h option prints this help.
The -V option prints the package version.
"""
def main(args = sys.argv):
"""
Main command line entry point.
"""
usage = USAGE % ((args[0],) * 2)
try:
popts, args = getopt.getopt(args[1:], 'e:o:hV')
except getopt.GetoptError as err:
sys.stderr.write(usage)
return 2
opts = {}
for opt, arg in popts:
opts[opt] = arg
if not opts and not args:
print(usage)
return 0
if opts.pop('-h', None) is not None:
print(usage)
return 0
if opts.pop('-V', None) is not None:
print('PygmenTeX version %s, (c) 2010 by José Romildo.' % __version__)
return 0
if len(args) != 1:
sys.stderr.write(usage)
return 2
infn = args[0]
try:
code = open(infn, 'rb').read()
except Exception as err:
sys.stderr.write('Error: cannot read input file: ')
sys.stderr.write(str(err))
return 1
outfn = opts.pop('-o', None)
if not outfn:
root, ext = splitext(infn)
outfn = root + '.pygmented'
try:
outfile = open(outfn, 'w')
except Exception as err:
sys.stderr.write('Error: cannot open output file: ')
sys.stderr.write(str(err))
return 1
convert(code, outfile)
return 0
if __name__ == '__main__':
try:
sys.exit(main(sys.argv))
except KeyboardInterrupt:
sys.exit(1)
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