#!/usr/bin/env python
# utf-8 must be used
# comments in CDATA may or may not be parsed

import cgitb
cgitb.enable()

import sys, os, re, urllib
sys.path = ['..', '../trio'] + sys.path
import trio

def homepage(): 
   print 'Content-Type: text/html'
   print 
   f = open('about.html')
   for line in f: 
      print line.rstrip('\r\n')
   f.close()
   sys.exit()

requri = os.environ.get('REQUEST_URI')
uri = requri.split('hturtle/', 1).pop()
if not uri or uri.startswith('?'): 
   try: 
      uri = __import__('cgi').FieldStorage()['uri'].value
      # print 'Content-Type: text/plain'
      # print 
      if uri.startswith('http://'): 
         uri = uri[7:]
      # print 'URI:', uri
      print 'Status: 307'
      print 'Location: http://inamidst.com/sw/hturtle/' + uri
      print 
      print '<a href="http://inamidst.com/sw/hturtle/%s">Go!</a>' % uri
      sys.exit()
   except KeyError: homepage()

print 'Content-Type: text/xml'
print 

if not uri.startswith('http://'): 
   uri = 'http://' + uri

r_comment = re.compile(r'<!--\{((?:[^-]|(?:-[^-]))*)\}-->')

G = trio.Graph(baseURI=uri)

u = urllib.urlopen(uri)
bytes = u.read()
u.close()

bindings = """\
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix doap: <http://usefulinc.com/ns/doap#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
"""

turtle = bindings + '\n'.join(r_comment.findall(bytes)) + '\n'
turtle = turtle.decode('utf-8')
G.parseText(turtle, 'turtle')

print '<xsl:stylesheet version="1.0" '
print '   xmlns:xsl="http://www.w3.org/1999/XSL/Transform">'
print '<xsl:template match="/">'
for line in G.serialiseToLines('rdfxml'): 
   print line
print '</xsl:template>'
print '</xsl:stylesheet>'

# EOF