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magicrebirth on 07/19/11

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Last Edited at 07/19/11 06:01pm

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Colorizing Python Source Using the Built-in Tokenizer

/ Published in: Python

You need to convert Python source code into HTML markup, rendering comments, keywords, operators, and numeric and string literals in different colors.
tokenize.generate_tokens does most of the work. We just need to loop over all tokens it finds, to output them with appropriate colorization:

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""" MoinMoin - Python Source Parser """
import cgi, sys, cStringIO
import keyword, token, tokenize
# Python Source Parser (does highlighting into HTML)
_KEYWORD = token.NT_OFFSET + 1
_TEXT    = token.NT_OFFSET + 2
_colors = {
    token.NUMBER:       '#0080C0',
    token.OP:           '#0000C0',
    token.STRING:       '#004080',
    tokenize.COMMENT:   '#008000',
    token.NAME:         '#000000',
    token.ERRORTOKEN:   '#FF8080',
    _KEYWORD:           '#C00000',
    _TEXT:              '#000000',
}
class Parser(object):
    """ Send colorized Python source HTML to output file (normally stdout).
    """
    def _ _init_ _(self, raw, out=sys.stdout):
        """ Store the source text. """
        self.raw = raw.expandtabs( ).strip( )
        self.out = out
    def format(self):
        """ Parse and send the colorized source to output. """
        # Store line offsets in self.lines
        self.lines = [0, 0]
        pos = 0
        while True:
            pos = self.raw.find('\n', pos) + 1
            if not pos: break
            self.lines.append(pos)
        self.lines.append(len(self.raw))
        # Parse the source and write it
        self.pos = 0
        text = cStringIO.StringIO(self.raw)
        self.out.write('<pre><font face="Lucida, Courier New">')
        try:
            for token in tokenize.generate_tokens(text.readline):
                # unpack the components of each token
                toktype, toktext, (srow, scol), (erow, ecol), line = token
                if False:  # You may enable this for debugging purposes only
                    print "type", toktype, token.tok_name[toktype],
                    print "text", toktext,
                    print "start", srow,scol, "end", erow,ecol, "<br>"
                # Calculate new positions
                oldpos = self.pos
                newpos = self.lines[srow] + scol
                self.pos = newpos + len(toktext)
                # Handle newlines
                if toktype in (token.NEWLINE, tokenize.NL):
                    self.out.write('\n')
                    continue
                # Send the original whitespace, if needed
                if newpos > oldpos:
                    self.out.write(self.raw[oldpos:newpos])
                # Skip indenting tokens, since they're whitespace-only
                if toktype in (token.INDENT, token.DEDENT):
                    self.pos = newpos
                    continue
                # Map token type to a color group
                if token.LPAR <= toktype <= token.OP:
                    toktype = token.OP
                elif toktype == token.NAME and keyword.iskeyword(toktext):
                    toktype = _KEYWORD
                color = _colors.get(toktype, _colors[_TEXT])
                style = ''
                if toktype == token.ERRORTOKEN:
                    style = ' style="border: solid 1.5pt #FF0000;"'
                # Send text
                self.out.write('<font color="%s"%s>' % (color, style))
                self.out.write(cgi.escape(toktext))
                self.out.write('</font>')
        except tokenize.TokenError, ex:
            msg = ex[0]
            line = ex[1][0]
            self.out.write("<h3>ERROR: %s</h3>%s\n" % (
                msg, self.raw[self.lines[line]:]))
        self.out.write('</font></pre>')
if _ _name_ _ == "_ _main_ _":
    print "Formatting..."
    # Open own source
    source = open('python.py').read( )
    # Write colorized version to "python.html"
    Parser(source, open('python.html', 'wt')).format( )
    # Load HTML page into browser
    import webbrowser
    webbrowser.open("python.html")

URL: http://book.opensourceproject.org.cn/lamp/python/pythoncook2/opensource/0596007973/pythoncook2-chp-16-sect-6.html

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