"""Module to analyze Python source code; for syntax coloring tools.Interface:	tags = fontify(pytext, searchfrom, searchto)The 'pytext' argument is a string containing Python source code.The (optional) arguments 'searchfrom' and 'searchto' may contain a slice in pytext. The returned value is a list of tuples, formatted like this:	[('keyword', 0, 6, None), ('keyword', 11, 17, None), ('comment', 23, 53, None), etc. ]The tuple contents are always like this:	(tag, startindex, endindex, sublist)tag is one of ('comment', 'string', 'keyword', 'function', 'class')sublist is not used, hence always None. """# Based on FontText.py by Mitchell S. Chapman,# which was modified by Zachary Roadhouse,# then un-Tk'd by Just van Rossum.# Many thanks for regular expression debugging & authoring are due to:#	Tim (the-incredib-ly y'rs) Peters and Cristian Tismer# So, who owns the copyright? ;-) How about this:# Copyright 1996-1997: #	Mitchell S. Chapman,#	Zachary Roadhouse,#	Tim Peters,#	Just van Rossum## Version 0.4 - changes copyright (C) 2001 Mark Pilgrim (mark@diveintopython.org)#   2001/02/05 - MAP - distinguish between class and function identifiers#   2001/03/21 - MAP - get keywords from keyword module (instead of hard-coded list)#   2001/03/22 - MAP - use re module instead of deprecated regex module__version__ = "0.4"import string, re, keyword# Build up a regular expression which will match anything# interesting, including multi-line triple-quoted strings.commentPat = "#.*"pat = "q[^\q\n]*(\\\\[\000-\377][^\q\n]*)*q"quotePat = string.replace(pat, "q", "'") + "|" + string.replace(pat, 'q', '"')# Way to go, Tim!pat = """	qqq	[^\\q]*	(		(	\\\\[\000-\377]		|	q			(	\\\\[\000-\377]			|	[^\\q]			|	q				(	\\\\[\000-\377]				|	[^\\q]				)			)		)		[^\\q]*	)*	qqq"""pat = string.join(string.split(pat), '')	# get rid of whitespacetripleQuotePat = string.replace(pat, "q", "'") + "|" + string.replace(pat, 'q', '"')# Build up a regular expression which matches all and only# Python keywords. This will let us skip the uninteresting# identifier references.# nonKeyPat identifies characters which may legally precede# a keyword pattern.nonKeyPat = "(^|[^a-zA-Z0-9_.\"'])"keywordsPat = string.join(keyword.kwlist, "|")keyPat = nonKeyPat + "(" + keywordsPat + ")" + nonKeyPatmatchPat = keyPat + "|" + commentPat + "|" + tripleQuotePat + "|" + quotePatmatchRE = re.compile(matchPat)idKeyPat = "[ \t]*[A-Za-z_][A-Za-z_0-9.]*"	# Ident w. leading whitespace.idRE = re.compile(idKeyPat)def fontify(pytext, searchfrom=0, searchto=None):	if searchto is None:		searchto = len(pytext)	tags = []	commentTag = 'comment'	stringTag = 'string'	keywordTag = 'keyword'	functionTag = 'function'	classTag = 'class'	start = 0	end = searchfrom	while 1:		matchObject = matchRE.search(pytext, end)		if not matchObject: break		(start, end) = matchObject.span()		match = matchObject.group(0)		c = match[0]		if c not in "#'\"":			# Must have matched a keyword.			if start <> searchfrom:				# there's still a redundant char before and after it, strip!				match = match[1:-1]				start = start + 1			else:				# this is the first keyword in the text.				# Only a space at the end.				match = match[:-1]			end = end - 1			tags.append((keywordTag, start, end, None))			# If this was a defining keyword, look ahead to the			# following identifier.			if match in ["def", "class"]:				idMatchObject = idRE.search(pytext, end)				if idMatchObject:					(start, end) = idMatchObject.span()					match = idMatchObject.group(0)					tags.append(((match=='def') and functionTag or classTag, start, end, None))		elif c == "#":			tags.append((commentTag, start, end, None))		else:			tags.append((stringTag, start, end, None))	return tagsdef test(path):	f = open(path)	text = f.read()	f.close()	tags = fontify(text)	for tag, start, end, sublist in tags:		print tag, `text[start:end]`, start, end