155 lines
4.8 KiB
Python
155 lines
4.8 KiB
Python
"""Module to analyze Python source code; for syntax coloring tools.
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Interface:
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tags = fontify(pytext, searchfrom, searchto)
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The 'pytext' argument is a string containing Python source code.
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The (optional) arguments 'searchfrom' and 'searchto' may contain a slice in pytext.
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The returned value is a list of tuples, formatted like this:
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[('keyword', 0, 6, None), ('keyword', 11, 17, None), ('comment', 23, 53, None), etc. ]
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The tuple contents are always like this:
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(tag, startindex, endindex, sublist)
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tag is one of 'keyword', 'string', 'comment' or 'identifier'
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sublist is not used, hence always None.
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"""
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# Based on FontText.py by Mitchell S. Chapman,
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# which was modified by Zachary Roadhouse,
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# then un-Tk'd by Just van Rossum.
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# Many thanks for regular expression debugging & authoring are due to:
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# Tim (the-incredib-ly y'rs) Peters and Cristian Tismer
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# So, who owns the copyright? ;-) How about this:
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# Copyright 1996-2001:
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# Mitchell S. Chapman,
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# Zachary Roadhouse,
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# Tim Peters,
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# Just van Rossum
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__version__ = "0.4"
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import string
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import re
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# First a little helper, since I don't like to repeat things. (Tismer speaking)
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import string
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def replace(where, what, with):
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return string.join(string.split(where, what), with)
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# This list of keywords is taken from ref/node13.html of the
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# Python 1.3 HTML documentation. ("access" is intentionally omitted.)
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keywordsList = [
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"as", "assert", "exec",
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"del", "from", "lambda", "return",
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"and", "elif", "global", "not", "try",
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"break", "else", "if", "or", "while",
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"class", "except", "import", "pass",
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"continue", "finally", "in", "print",
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"def", "for", "is", "raise", "yield"]
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# Build up a regular expression which will match anything
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# interesting, including multi-line triple-quoted strings.
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commentPat = r"#[^\n]*"
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pat = r"q[^\\q\n]*(\\[\000-\377][^\\q\n]*)*q"
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quotePat = replace(pat, "q", "'") + "|" + replace(pat, 'q', '"')
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# Way to go, Tim!
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pat = r"""
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qqq
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[^\\q]*
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(
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( \\[\000-\377]
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| q
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( \\[\000-\377]
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| [^\q]
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| q
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( \\[\000-\377]
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| [^\\q]
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)
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)
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)
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[^\\q]*
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)*
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qqq
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"""
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pat = string.join(string.split(pat), '') # get rid of whitespace
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tripleQuotePat = replace(pat, "q", "'") + "|" + replace(pat, 'q', '"')
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# Build up a regular expression which matches all and only
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# Python keywords. This will let us skip the uninteresting
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# identifier references.
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# nonKeyPat identifies characters which may legally precede
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# a keyword pattern.
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nonKeyPat = r"(^|[^a-zA-Z0-9_.\"'])"
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keyPat = nonKeyPat + "(" + string.join(keywordsList, "|") + ")" + nonKeyPat
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matchPat = commentPat + "|" + keyPat + "|" + tripleQuotePat + "|" + quotePat
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matchRE = re.compile(matchPat)
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idKeyPat = "[ \t]*[A-Za-z_][A-Za-z_0-9.]*" # Ident w. leading whitespace.
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idRE = re.compile(idKeyPat)
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def fontify(pytext, searchfrom = 0, searchto = None):
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if searchto is None:
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searchto = len(pytext)
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# Cache a few attributes for quicker reference.
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search = matchRE.search
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idSearch = idRE.search
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tags = []
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tags_append = tags.append
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commentTag = 'comment'
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stringTag = 'string'
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keywordTag = 'keyword'
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identifierTag = 'identifier'
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start = 0
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end = searchfrom
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while 1:
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m = search(pytext, end)
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if m is None:
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break # EXIT LOOP
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start = m.start()
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if start >= searchto:
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break # EXIT LOOP
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match = m.group(0)
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end = start + len(match)
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c = match[0]
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if c not in "#'\"":
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# Must have matched a keyword.
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if start <> searchfrom:
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# there's still a redundant char before and after it, strip!
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match = match[1:-1]
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start = start + 1
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else:
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# this is the first keyword in the text.
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# Only a space at the end.
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match = match[:-1]
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end = end - 1
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tags_append((keywordTag, start, end, None))
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# If this was a defining keyword, look ahead to the
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# following identifier.
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if match in ["def", "class"]:
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m = idSearch(pytext, end)
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if m is not None:
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start = m.start()
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if start == end:
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match = m.group(0)
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end = start + len(match)
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tags_append((identifierTag, start, end, None))
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elif c == "#":
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tags_append((commentTag, start, end, None))
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else:
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tags_append((stringTag, start, end, None))
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return tags
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def test(path):
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f = open(path)
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text = f.read()
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f.close()
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tags = fontify(text)
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for tag, start, end, sublist in tags:
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print tag, `text[start:end]` |