#!/usr/bin/env python -u

"""Python Highlighter                                    Version: 0.8

py2html.py [options] files...

options:
 -h             print help
 -              read from stdin, write to stdout
 -stdout        read from files, write to stdout
 -files         read from files, write to filename+'.html' (default)
 -format:
   html         output XHTML page (default)
   rawhtml      output pure XHTML (without headers, titles, etc.)
 -mode:
   color        output in color (default)
   mono         output b/w (for printing)
 -title:Title   use 'Title' as title of the generated page
 -bgcolor:color use color as background-color for page
 -header:file   use contents of file as header
 -footer:file   use contents of file as footer
 -URL           replace all occurances of 'URL: link' with
                '<a href="link">link</a>'; this is always enabled
                in CGI mode
 -v             verbose

Takes the input, assuming it is Python code and formats it into
colored XHTML. When called without parameters the script tries to
work in CGI mode. It looks for a field 'script=URL' and tries to
use that URL as input file. If it can't find this field, the path
info (the part of the URL following the CGI script name) is
tried. In case no host is given, the host where the CGI script
lives and HTTP are used.

  * Uses Just van Rossum's PyFontify version 0.3 to tag Python scripts.
    You can get it via his homepage on starship:
    URL: http://starship.python.net/~just/
"""
__comments__ = """

The following snippet is a small shell script I use for viewing
Python scripts via less on Unix:

pyless:
#!/bin/sh
# Browse pretty printed Python code using ANSI codes for highlighting
py2html -stdout -format:ansi -mode:color $* | less -r

History:

Clean-up and modified expand tabs patch by Christoph Zwerschke.

0.8: Added patch by Patrick Lynch to have py2html.py use style
     sheets for markup
0.7: Added patch by Ville Skytta to make py2html.py output
     valid XHTML.
0.6: Fixed a bug in .escape_html(); thanks to Vespe Savikko for
     finding this one.
0.5: Added a few suggestions by Kevin Ng to make the CGI version
     a little more robust.

"""

__copyright__ = """\
Copyright (c) 1998-2000, Marc-Andre Lemburg; mailto:mal@lemburg.com
Copyright (c) 2000-2002, eGenix.com Software GmbH; mailto:info@egenix.com
Distributed under the terms and conditions of the eGenix.com Public
License. See http://www.egenix.com/files/python/mxLicense.html for
details, or contact the author. All Rights Reserved.\
"""

__version__ = '0.8'

__cgifooter__ = ('\n<pre># code highlighted using <a href='
    '"http://www.lemburg.com/files/python/">py2html.py</a> '
    'version %s</pre>\n' % __version__)

import sys
import re

# Adjust path so that PyFontify is found...
if '.' not in sys.path:
    sys.path.append('.')


### Constants

# URL of the input form the user is redirected to in case no script=xxx
# form field is given. The URL *must* be absolute. Leave blank to
# have the script issue an error instead.
INPUT_FORM = None

# HTML DOCTYPE and XML namespace
HTML_DOCTYPE = '<!DOCTYPE html>'
HTML_XMLNS = ' xmlns="http://www.w3.org/1999/xhtml"'


### Helpers

def fileio(file, mode='rb', data=None, close=False):
    if isinstance(file, basestring):
        f = open(file, mode)
        close = True
    else:
        f = file
    if data:
        f.write(data)
    else:
        data = f.read()
    if close:
        f.close()
    return data


### Converter class

class PrettyPrint(object):
    """Generic Pretty Printer class.

      * supports tagging Python scripts in the following ways:

        # format/mode |  color  mono
        # --------------------------
        # rawhtml     |    x     x   (HTML without headers, etc.)
        # html        |    x     x   (a HTML page with HEAD&BODY:)
        # ansi        |    x     x   (with Ansi-escape sequences)

      * interfaces:

         file_filter -- takes two files: input & output (may be stdin/stdout)
         filter -- takes a string and returns the highlighted version

      * to create an instance use:

        c = PrettyPrint(tagfct,format,mode)

        where format and mode must be strings according to the
        above table if you plan to use PyFontify.fontify as tagfct

      * the tagfct has to take one argument, text, and return a taglist
        (format: [(id,left,right,sublist),...], where id is the
        "name" given to the slice left:right in text and sublist is a
        taglist for tags inside the slice or None)
    """

    # misc settings
    title = ''
    bgcolor = '#EEF'
    css = ''
    header = ''
    footer = ''
    replace_URLs = False
    # formats to be used
    formats = {}

    def __init__(self, tagfct=None, format='html', mode='color'):
        self.tag = tagfct
        self.set_mode = getattr(self,'set_mode_%s_%s' % (format, mode))
        self.filter = getattr(self,'filter_%s' % format)

    def file_filter(self, infile, outfile):
        self.set_mode()
        text = fileio(infile, 'r')
        if isinstance(infile, basestring) and not self.title:
            self.title = infile
        fileio(outfile, 'w', self.filter(text))

    ### Set pre- and postfixes for formats & modes
    #
    # These methods must set self.formats to a dictionary having
    # an entry for every tag returned by the tagging function.
    #
    # The format used is simple:
    #  tag:(prefix,postfix)
    # where prefix and postfix are either strings or callable objects,
    # that return a string (they are called with the matching tag text
    # as only parameter). prefix is inserted in front of the tag, postfix
    # is inserted right after the tag.

    def set_mode_html_color(self):
        self.css = """
<style type="text/css">
<!--
body{ background: %s;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 10pt;
padding: 3pt; }
.PY_KEYWORD{ color: #00C; font-weight: bold; }
.PY_COMMENT{ color: #008; }
.PY_PARAMETER{ color: #C00; }
.PY_IDENTIFIER{ color: #C00; font-weight: bold; }
.PY_STRING{ color: #080; }
-->
</style>""" % self.bgcolor
        self.formats = {
            'all': ('<pre>', '</pre>'),
            'comment': ('<span class="PY_COMMENT">', '</span>'),
            'keyword': ('<span class="PY_KEYWORD">', '</span>'),
            'parameter': ('<span class="PY_PARAMETER">', '</span>'),
            'identifier': (lambda x:
                '<a id="%s"><span class="PY_IDENTIFIER">' % x.strip(),
                '</span></a>'),
            'string': ('<span class="PY_STRING">', '</span>')
            }

    set_mode_rawhtml_color = set_mode_html_color

    def set_mode_html_mono(self):
        self.css = """
<style type="text/css">
<!--
body{ background-color: %s;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 10pt;
padding: 3pt; }
.PY_KEYWORD{ text-decoration: underline }
.PY_COMMENT{ }
.PY_PARAMETER{ }
.PY_IDENTIFIER{ font-weight: bold}
.PY_STRING{ font-style: italic}
-->
</style> """ % self.bgcolor
        self.formats = {
            'all': ('<pre>', '</pre>'),
            'comment': ('<span class="PY_COMMENT">', '</span>'),
            'keyword': ('<span class="PY_KEYWORD">', '</span>'),
            'parameter': ('<span class="PY_PARAMETER">', '</span>'),
            'identifier': (lambda x:
                '<a id="%s"><span class="PY_IDENTIFIER">' % x.strip(),
                '</span></a>'),
            'string': ('<span class="PY_STRING">', '</span>')
            }

    set_mode_rawhtml_mono = set_mode_html_mono

    def set_mode_ansi_mono(self):
        self.formats = {
            'all': ('', ''),
            'comment': ('\033[2m', '\033[m'),
            'keyword': ('\033[4m', '\033[m'),
            'parameter': ('', ''),
            'identifier': ('\033[1m', '\033[m'),
            'string': ('', '')
            }

    def set_mode_ansi_color(self):
        self.formats = {
            'all': ('', ''),
            'comment': ('\033[34;2m', '\033[m'),
            'keyword': ('\033[1;34m', '\033[m'),
            'parameter': ('', ''),
            'identifier': ('\033[1;31m', '\033[m'),
            'string': ('\033[32;2m', '\033[m')
            }

    ### Filters for Python scripts given as string

    def escape_html(self, text):
        t = (('&','&amp;'), ('<','&lt;'), ('>','&gt;'))
        for x, y in t:
            text = y.join(text.split(x))
        return text

    def expand_tabs(self, s):
        # 2005-09-09 cz: convert tabs to spaces
        return s.expandtabs(4)

    def filter_html(self, text):
        output = self.fontify(self.escape_html(self.expand_tabs(text)))
        if self.replace_URLs:
            output = re.sub('URL:([ \t]+)([^ \n\r<]+)',
                'URL:\\1<a href="\\2">\\2</a>', output)
        html = """%s
<html%s>
<head>
<title>%s</title>
<!--css-->
%s
</head>
<body>
<!--header-->
%s
<!--script-->
%s
<!--footer-->
%s
</body>
</html>\n""" % (HTML_DOCTYPE, HTML_XMLNS,
            self.title, self.css,
            self.header, output, self.footer)
        return html

    def filter_rawhtml(self, text):
        output = self.fontify(self.escape_html(self.expand_tabs(text)))
        if self.replace_URLs:
            output = re.sub('URL:([ \t]+)([^ \n\r<]+)',
                'URL:\\1<a href="\\2">\\2</a>', output)
        return self.header + output + self.footer

    def filter_ansi(self, text):
        output = self.fontify(self.expand_tabs(text))
        return self.header + output + self.footer

    ### Fontify engine

    def fontify(self, pytext):
        # parse
        taglist = self.tag(pytext)

        # prepend special 'all' tag:
        taglist[:0] = [('all', 0, len(pytext), None)]

        # prepare splitting
        splits = []
        addsplits(splits, pytext, self.formats, taglist)

        # do splitting & inserting
        s = []
        li = 0
        for ri, dummy, insert in sorted(splits):
            if ri > li:
                s.append(pytext[li:ri])
            s.append(insert)
            li = ri
        if li < len(pytext):
            s.append(pytext[li:])

        return ''.join(s)


### Auxiliary

def addsplits(splits, text, formats, taglist):
    """Helper for .fontify()"""
    for id, left, right, sublist in taglist:
        try:
            pre, post = formats[id]
        except KeyError:
            # print >>sys.stderr, 'No format for %s specified\n' % repr(id)
            pre, post = '',''
        if not isinstance(pre, basestring):
            pre = pre(text[left:right])
        if not isinstance(post, basestring):
            post = post(text[left:right])
        # len(splits) is a dummy used to make sorting stable
        splits.append((left, len(splits), pre))
        if sublist:
            addsplits(splits, text, formats, sublist)
        splits.append((right, len(splits), post))

def write_html_error(titel, text):
    print """\
%s<html%s><head><title>%s</title></head>
<body>
<h2>%s</h2>
%s
</body></html>
""" % (HTML_DOCTYPE, HTML_XMLNS, titel, titel, text)

def redirect_to(url):
    sys.stdout.write('Content-Type: text/html\r\n')
    sys.stdout.write('Status: 302\r\n')
    sys.stdout.write('Location: %s\r\n\r\n' % url)
    print """
%s<html%s><head>
<title>302 Moved Temporarily</title>
</head><body>
<h1>302 Moved Temporarily</h1>
The document has moved to <a href="%s">%s</a>.<p></p>
</body></html>
""" % (HTML_DOCTYPE, HTML_XMLNS, url, url)


### Main

def main(cmdline):
    """main(cmdline) -- process cmdline as if it were sys.argv"""

    # parse options/files
    options = []
    optvalues = {}
    for opt in cmdline[1:]:
        if opt.startswith('-'):
            if ':' in opt:
                k, v = tuple(opt.split(':', 1))
                optvalues[k] = v
                options.append(k)
            else:
                options.append(opt)
        else:
            break
    files = cmdline[len(options)+1:]

    ### create converting object

    verbose = ('-v' in options)

    # load fontifier
    if '-marcs' in options:
        # use mxTextTool's tagging engine as fontifier
        from mx.TextTools import tag
        from mx.TextTools.Examples.Python import python_script
        tagfct = lambda text, tag=tag, pytable=python_script: tag(
            text, pytable)[1]
        print "Py2HTML: using Marc's tagging engine"
    else:
        # load Just's fontifier
        try:
            import PyFontify
            if PyFontify.__version__ < '0.3':
                raise ImportError
            tagfct = PyFontify.fontify
        except ImportError:
            print """
Sorry, but this script needs the PyFontify.py module version 0.3;
You can download it from Just's homepage at
URL: http://starship.python.net/~just/
"""
            sys.exit()

    if '-format' in options:
        format = optvalues['-format']
    else:
        # use default
        format = 'html'

    if '-mode' in options:
        mode = optvalues['-mode']
    else:
        # use default
        mode = 'color'

    c = PrettyPrint(tagfct, format, mode)
    convert = c.file_filter

    ### start working

    if '-title' in options:
        c.title = optvalues['-title']

    if '-bgcolor' in options:
        c.bgcolor = optvalues['-bgcolor']

    if '-header' in options:
        try:
            f = open(optvalues['-header'])
            c.header = f.read()
            f.close()
        except IOError:
            if verbose:
                print 'IOError: header file not found'

    if '-footer' in options:
        try:
            f = open(optvalues['-footer'])
            c.footer = f.read()
            f.close()
        except IOError:
            if verbose:
                print 'IOError: footer file not found'

    if '-URL' in options:
        c.replace_URLs = True

    if '-' in options:
        convert(sys.stdin, sys.stdout)
        sys.exit()

    if '-h' in options:
        print __doc__
        sys.exit()

    if not files:
        # Turn URL processing on
        c.replace_URLs = True
        # Try CGI processing...
        import cgi, urllib, urlparse, os
        form = cgi.FieldStorage()
        if 'script' not in form:
            # Ok, then try pathinfo
            if 'PATH_INFO' not in os.environ:
                if INPUT_FORM:
                    redirect_to(INPUT_FORM)
                else:
                    sys.stdout.write('Content-Type: text/html\r\n\r\n')
                    write_html_error('Missing Parameter',
                        'Missing script=URL field in request')
                sys.exit(1)
            url = os.environ['PATH_INFO'][1:]  # skip the leading slash
        else:
            url = form['script'].value
        sys.stdout.write('Content-Type: text/html\r\n\r\n')
        scheme, host, path, params, query, frag = urlparse.urlparse(url)
        if not host:
            scheme = 'http'
            host = os.environ.get('HTTP_HOST', 'localhost')
            url = urlparse.urlunparse((scheme, host, path, params, query, frag))
        #print url; sys.exit()
        network = urllib.URLopener()
        try:
            tempfile, headers = network.retrieve(url)
        except IOError as reason:
            write_html_error('Error opening "%s"' % url,
                'The given URL could not be opened. Reason: %s' % str(reason))
            sys.exit(1)
        f = open(tempfile,'rb')
        c.title = url
        c.footer = __cgifooter__
        convert(f, sys.stdout)
        f.close()
        network.close()
        sys.exit()

    if '-stdout' in options:
        filebreak = '-'*72
        for f in files:
            try:
                if len(files) > 1:
                    print filebreak
                    print 'File:', f
                    print filebreak
                convert(f, sys.stdout)
            except IOError:
                pass
    else:
        if verbose:
            print 'Py2HTML: working on',
        for f in files:
            try:
                if verbose:
                    print f,
                convert(f, f+'.html')
            except IOError:
                if verbose:
                    print '(IOError!)',
        if verbose:
            print
            print 'Done.'


if __name__ == '__main__':
    main(sys.argv)
