# -*- coding: utf-8 -*-
"""
pygments.formatters.latex
~~~~~~~~~~~~~~~~~~~~~~~~~
Formatter for LaTeX fancyvrb output.
:copyright: Copyright 2006-2010 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from pygments.formatter import Formatter
from pygments.token import Token,STANDARD_TYPES
from pygments.util import get_bool_opt,get_int_opt,StringIO
__all__ = ['LatexFormatter']
def escape_tex(text, commandprefix):
return text.replace('\\', '\x00'). \
replace('{', '\x01'). \
replace('}', '\x02'). \
replace('^', '\x03'). \
replace('_', '\x04'). \
replace('\x00', r'\%sZbs{}' % commandprefix). \
replace('\x01', r'\%sZob{}' % commandprefix). \
replace('\x02', r'\%sZcb{}' % commandprefix). \
replace('\x03', r'\%sZca{}' % commandprefix). \
replace('\x04', r'\%sZus{}' % commandprefix)
DOC_TEMPLATE = r'''
\documentclass{%(docclass)s}
\usepackage{fancyvrb}
\usepackage{color}
\usepackage[%(encoding)s]{inputenc}
%(preamble)s
%(styledefs)s
\begin{document}
\section*{%(title)s}
%(code)s
\end{document}
'''
## Small explanation of the mess below :)
#
# The previous version of the LaTeX formatter just assigned a command to
# each token type defined in the current style. That obviously is
# problematic if the highlighted code is produced for a different style
# than the style commands themselves.
#
# This version works much like the HTML formatter which assigns multiple
# CSS classes to each <span> tag, from the most specific to the least
# specific token type, thus falling back to the parent token type if one
# is not defined. Here, the classes are there too and use the same short
# forms given in token.STANDARD_TYPES.
#
# Highlighted code now only uses one custom command, which by default is
# \PY and selectable by the commandprefix option (and in addition the
# escapes \PYZat, \PYZlb and \PYZrb which haven't been renamed for
# backwards compatibility purposes).
#
# \PY has two arguments: the classes, separated by +, and the text to
# render in that style. The classes are resolved into the respective
# style commands by magic, which serves to ignore unknown classes.
#
# The magic macros are:
# * \PY@it, \PY@bf, etc. are unconditionally wrapped around the text
# to render in \PY@do. Their definition determines the style.
# * \PY@reset resets \PY@it etc. to do nothing.
# * \PY@toks parses the list of classes, using magic inspired by the
# keyval package (but modified to use plusses instead of commas
# because fancyvrb redefines commas inside its environments).
# * \PY@tok processes one class, calling the \PY@tok@classname command
# if it exists.
# * \PY@tok@classname sets the \PY@it etc. to reflect the chosen style
# for its class.
# * \PY resets the style, parses the classnames and then calls \PY@do.
STYLE_TEMPLATE = r'''
\makeatletter
\def\%(cp)s@reset{\let\%(cp)s@it=\relax \let\%(cp)s@bf=\relax%%
\let\%(cp)s@ul=\relax \let\%(cp)s@tc=\relax%%
\let\%(cp)s@bc=\relax \let\%(cp)s@ff=\relax}
\def\%(cp)s@tok#1{\csname %(cp)s@tok@#1\endcsname}
\def\%(cp)s@toks#1+{\ifx\relax#1\empty\else%%
\%(cp)s@tok{#1}\expandafter\%(cp)s@toks\fi}
\def\%(cp)s@do#1{\%(cp)s@bc{\%(cp)s@tc{\%(cp)s@ul{%%
\%(cp)s@it{\%(cp)s@bf{\%(cp)s@ff{#1}}}}}}}
\def\%(cp)s#1#2{\%(cp)s@reset\%(cp)s@toks#1+\relax+\%(cp)s@do{#2}}
%(styles)s
\def\%(cp)sZbs{\char`\\}
\def\%(cp)sZus{\char`\_}
\def\%(cp)sZob{\char`\{}
\def\%(cp)sZcb{\char`\}}
\def\%(cp)sZca{\char`\^}
%% for compatibility with earlier versions
\def\%(cp)sZat{@}
\def\%(cp)sZlb{[}
\def\%(cp)sZrb{]}
\makeatother
'''
def _get_ttype_name(ttype):
fname = STANDARD_TYPES.get(ttype)
if fname:
return fname
aname = ''
while fname is None:
aname = ttype[-1] + aname
ttype = ttype.parent
fname = STANDARD_TYPES.get(ttype)
return fname + aname
class LatexFormatter(Formatter):
r"""
Format tokens as LaTeX code. This needs the `fancyvrb` and `color`
standard packages.
Without the `full` option, code is formatted as one ``Verbatim``
environment, like this:
.. sourcecode:: latex
\begin{Verbatim}[commandchars=@\[\]]
@PY[k][def ]@PY[n+nf][foo](@PY[n][bar]):
@PY[k][pass]
\end{Verbatim}
The special command used here (``@PY``) and all the other macros it needs
are output by the `get_style_defs` method.
With the `full` option, a complete LaTeX document is output, including
the command definitions in the preamble.
The `get_style_defs()` method of a `LatexFormatter` returns a string
containing ``\def`` commands defining the macros needed inside the
``Verbatim`` environments.
Additional options accepted:
`style`
The style to use, can be a string or a Style subclass (default:
``'default'``).
`full`
Tells the formatter to output a "full" document, i.e. a complete
self-contained document (default: ``False``).
`title`
If `full` is true, the title that should be used to caption the
document (default: ``''``).
`docclass`
If the `full` option is enabled, this is the document class to use
(default: ``'article'``).
`preamble`
If the `full` option is enabled, this can be further preamble commands,
e.g. ``\usepackage`` (default: ``''``).
`linenos`
If set to ``True``, output line numbers (default: ``False``).
`linenostart`
The line number for the first line (default: ``1``).
`linenostep`
If set to a number n > 1, only every nth line number is printed.
`verboptions`
Additional options given to the Verbatim environment (see the *fancyvrb*
docs for possible values) (default: ``''``).
`commandprefix`
The LaTeX commands used to produce colored output are constructed
using this prefix and some letters (default: ``'PY'``).
*New in Pygments 0.7.*
*New in Pygments 0.10:* the default is now ``'PY'`` instead of ``'C'``.
`texcomments`
If set to ``True``, enables LaTeX comment lines. That is, LaTex markup
in comment tokens is not escaped so that LaTeX can render it (default:
``False``). *New in Pygments 1.2.*
`mathescape`
If set to ``True``, enables LaTeX math mode escape in comments. That
is, ``'$...$'`` inside a comment will trigger math mode (default:
``False``). *New in Pygments 1.2.*
"""
name = 'LaTeX'
aliases = ['latex', 'tex']
filenames = ['*.tex']
def __init__(self, **options):
Formatter.__init__(self, **options)
self.docclass = options.get('docclass', 'article')
self.preamble = options.get('preamble', '')
self.linenos = get_bool_opt(options, 'linenos', False)
self.linenostart = abs(get_int_opt(options, 'linenostart', 1))
self.linenostep = abs(get_int_opt(options, 'linenostep', 1))
self.verboptions = options.get('verboptions', '')
self.nobackground = get_bool_opt(options, 'nobackground', False)
self.commandprefix = options.get('commandprefix', 'PY')
self.texcomments = get_bool_opt(options, 'texcomments', False)
self.mathescape = get_bool_opt(options, 'mathescape', False)
self._create_stylesheet()
def _create_stylesheet(self):
t2n = self.ttype2name = {Token: ''}
c2d = self.cmd2def = {}
cp = self.commandprefix
def rgbcolor(col):
if col:
return ','.join(['%.2f' %(int(col[i] + col[i + 1], 16) / 255.0)
for i in (0, 2, 4)])
else:
return '1,1,1'
for ttype, ndef in self.style:
name = _get_ttype_name(ttype)
cmndef = ''
if ndef['bold']:
cmndef += r'\let\$$@bf=\textbf'
if ndef['italic']:
cmndef += r'\let\$$@it=\textit'
if ndef['underline']:
cmndef += r'\let\$$@ul=\underline'
if ndef['roman']:
cmndef += r'\let\$$@ff=\textrm'
if ndef['sans']:
cmndef += r'\let\$$@ff=\textsf'
if ndef['mono']:
cmndef += r'\let\$$@ff=\textsf'
if ndef['color']:
cmndef += (r'\def\$$@tc##1{\textcolor[rgb]{%s}{##1}}' %
rgbcolor(ndef['color']))
if ndef['border']:
cmndef += (r'\def\$$@bc##1{\fcolorbox[rgb]{%s}{%s}{##1}}' %
(rgbcolor(ndef['border']),
rgbcolor(ndef['bgcolor'])))
elif ndef['bgcolor']:
cmndef += (r'\def\$$@bc##1{\colorbox[rgb]{%s}{##1}}' %
rgbcolor(ndef['bgcolor']))
if cmndef == '':
continue
cmndef = cmndef.replace('$$', cp)
t2n[ttype] = name
c2d[name] = cmndef
def get_style_defs(self, arg=''):
"""
Return the command sequences needed to define the commands
used to format text in the verbatim environment. ``arg`` is ignored.
"""
cp = self.commandprefix
styles = []
for name, definition in self.cmd2def.iteritems():
styles.append(r'\def\%s@tok@%s{%s}' % (cp, name, definition))
return STYLE_TEMPLATE % {'cp': self.commandprefix,
'styles': '\n'.join(styles)}
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(r'\begin{Verbatim}[commandchars=\\\{\}')
if self.linenos:
start, step = self.linenostart, self.linenostep
outfile.write(',numbers=left' +
(start and ',firstnumber=%d' % start or '') +
(step and ',stepnumber=%d' % step or ''))
if self.mathescape or self.texcomments:
outfile.write(r',codes={\catcode`\$=3\catcode`\^=7\catcode`\_=8}')
if self.verboptions:
outfile.write(',' + self.verboptions)
outfile.write(']\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)
else:
value = escape_tex(value, self.commandprefix)
else:
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('\\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()))
|