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#!/usr/bin/env python
'''
NAME
code-filter - AsciiDoc filter to highlight language keywords
SYNOPSIS
code-filter -b backend -l language [ -t tabsize ]
[ --help | -h ] [ --version | -v ]
DESCRIPTION
This filter reads source code from the standard input, highlights language
keywords and comments and writes to the standard output.
The purpose of this program is to demonstrate how to write an AsciiDoc
filter -- it's much to simplistic to be passed off as a code syntax
highlighter. Use the 'source-highlight-filter' instead.
OPTIONS
--help, -h
Print this documentation.
-b
Backend output file format: 'docbook', 'linuxdoc', 'html', 'css'.
-l
The name of the source code language: 'python', 'ruby', 'c++', 'c'.
-t tabsize
Expand source tabs to tabsize spaces.
--version, -v
Print program version number.
BUGS
- Code on the same line as a block comment is treated as comment.
Keywords inside literal strings are highlighted.
- There doesn't appear to be an easy way to accomodate linuxdoc so
just pass it through without markup.
AUTHOR
Written by Stuart Rackham, <srackham@gmail.com>
URLS
http://sourceforge.net/projects/asciidoc/
http://www.methods.co.nz/asciidoc/
COPYING
Copyright (C) 2002-2006 Stuart Rackham. Free use of this software is
granted under the terms of the GNU General Public License (GPL).
'''
import os, sys, re, string
VERSION = '1.1.2'
# Globals.
language = None
backend = None
tabsize = 8
keywordtags = {
'html':
('<strong>','</strong>'),
'css':
('<strong>','</strong>'),
'docbook':
('<emphasis role="strong">','</emphasis>'),
'linuxdoc':
('','')
}
commenttags = {
'html':
('<i>','</i>'),
'css':
('<i>','</i>'),
'docbook':
('<emphasis>','</emphasis>'),
'linuxdoc':
('','')
}
keywords = {
'python':
('and', 'del', 'for', 'is', 'raise', 'assert', 'elif', 'from',
'lambda', 'return', 'break', 'else', 'global', 'not', 'try', 'class',
'except', 'if', 'or', 'while', 'continue', 'exec', 'import', 'pass',
'yield', 'def', 'finally', 'in', 'print'),
'ruby':
('__FILE__', 'and', 'def', 'end', 'in', 'or', 'self', 'unless',
'__LINE__', 'begin', 'defined?' 'ensure', 'module', 'redo', 'super',
'until', 'BEGIN', 'break', 'do', 'false', 'next', 'rescue', 'then',
'when', 'END', 'case', 'else', 'for', 'nil', 'retry', 'true', 'while',
'alias', 'class', 'elsif', 'if', 'not', 'return', 'undef', 'yield'),
'c++':
('asm', 'auto', 'bool', 'break', 'case', 'catch', 'char', 'class',
'const', 'const_cast', 'continue', 'default', 'delete', 'do', 'double',
'dynamic_cast', 'else', 'enum', 'explicit', 'export', 'extern',
'false', 'float', 'for', 'friend', 'goto', 'if', 'inline', 'int',
'long', 'mutable', 'namespace', 'new', 'operator', 'private',
'protected', 'public', 'register', 'reinterpret_cast', 'return',
'short', 'signed', 'sizeof', 'static', 'static_cast', 'struct',
'switch', 'template', 'this', 'throw', 'true', 'try', 'typedef',
'typeid', 'typename', 'union', 'unsigned', 'using', 'virtual', 'void',
'volatile', 'wchar_t', 'while')
}
block_comments = {
'python': ("'''","'''"),
'ruby': None,
'c++': ('/*','*/')
}
inline_comments = {
'python': '#',
'ruby': '#',
'c++': '//'
}
def print_stderr(line):
sys.stderr.write(line+os.linesep)
def sub_keyword(mo):
'''re.subs() argument to tag keywords.'''
word = mo.group('word')
if word in keywords[language]:
stag,etag = keywordtags[backend]
return stag+word+etag
else:
return word
def code_filter():
'''This function does all the work.'''
global language, backend
inline_comment = inline_comments[language]
blk_comment = block_comments[language]
if blk_comment:
blk_comment = (re.escape(block_comments[language][0]),
re.escape(block_comments[language][1]))
stag,etag = commenttags[backend]
in_comment = 0 # True if we're inside a multi-line block comment.
tag_comment = 0 # True if we should tag the current line as a comment.
line = sys.stdin.readline()
while line:
line = string.rstrip(line)
line = string.expandtabs(line,tabsize)
# Escape special characters.
line = string.replace(line,'&','&')
line = string.replace(line,'<','<')
line = string.replace(line,'>','>')
# Process block comment.
if blk_comment:
if in_comment:
if re.match(r'.*'+blk_comment[1]+r'$',line):
in_comment = 0
else:
if re.match(r'^\s*'+blk_comment[0]+r'.*'+blk_comment[1],line):
# Single line block comment.
tag_comment = 1
elif re.match(r'^\s*'+blk_comment[0],line):
# Start of multi-line block comment.
tag_comment = 1
in_comment = 1
else:
tag_comment = 0
if tag_comment:
if line: line = stag+line+etag
else:
if inline_comment:
pos = string.find(line,inline_comment)
else:
pos = -1
if pos >= 0:
# Process inline comment.
line = re.sub(r'\b(?P<word>\w+)\b',sub_keyword,line[:pos]) \
+ stag + line[pos:] + etag
else:
line = re.sub(r'\b(?P<word>\w+)\b',sub_keyword,line)
sys.stdout.write(line + os.linesep)
line = sys.stdin.readline()
def usage(msg=''):
if msg:
print_stderr(msg)
print_stderr('Usage: code-filter -b backend -l language [ -t tabsize ]')
print_stderr(' [ --help | -h ] [ --version | -v ]')
def main():
global language, backend, tabsize
# Process command line options.
import getopt
opts,args = getopt.getopt(sys.argv[1:],
'b:l:ht:v',
['help','version'])
if len(args) > 0:
usage()
sys.exit(1)
for o,v in opts:
if o in ('--help','-h'):
print __doc__
sys.exit(0)
if o in ('--version','-v'):
print('code-filter version %s' % (VERSION,))
sys.exit(0)
if o == '-b': backend = v
if o == '-l':
v = string.lower(v)
if v == 'c': v = 'c++'
language = v
if o == '-t':
try:
tabsize = int(v)
except:
usage('illegal tabsize')
sys.exit(1)
if tabsize <= 0:
usage('illegal tabsize')
sys.exit(1)
if backend is None:
usage('backend option is mandatory')
sys.exit(1)
if not keywordtags.has_key(backend):
usage('illegal backend option')
sys.exit(1)
if language is None:
usage('language option is mandatory')
sys.exit(1)
if not keywords.has_key(language):
usage('illegal language option')
sys.exit(1)
# Do the work.
code_filter()
if __name__ == "__main__":
try:
main()
except (KeyboardInterrupt, SystemExit):
pass
except:
print_stderr("%s: unexpected exit status: %s" %
(os.path.basename(sys.argv[0]), sys.exc_info()[1]))
# Exit with previous sys.exit() status or zero if no sys.exit().
sys.exit(sys.exc_info()[1])
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