Overhaul JSON Schema Compiler to support a number of features required to

tools/json_schema_compiler/preview.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Server for viewing the compiled C++ code from tools/json_schema_compiler.
 """
 
 import cc_generator
 import code
@@ skipping 231 matching lines @@
           self.server.highlighters[highlighter_param].GetCSS(style_param) +
           '</style>')
       body.Append(self.server.highlighters[highlighter_param]
           .GetCodeElement(cpp_code, style_param))
     except IOError:
       self.send_error(404, "File not found: %s" % request_path)
       return
     except (TypeError, KeyError, AttributeError,
         AssertionError, NotImplementedError) as error:
       body.Append('<pre>')
-      body.Append('compiler error: ' + str(error))
+      body.Append('compiler error: %s' % error)
       body.Append('Check server log for more details')
       body.Append('</pre>')
       raise
 
   def _GetHighlighterParams(self, parsed_url):
     """Get the highlighting parameters from a parsed url.
     """
     query_dict = urlparse.parse_qs(parsed_url.query)
     return (query_dict.get('highlighter', ['pygments'])[0],
         query_dict.get('style', ['colorful'])[0])
@@ skipping 89 matching lines @@
       highlighters['pygments'] = pygments_highlighter.PygmentsHighlighter()
     except ImportError as e:
       pass
 
     server = PreviewHTTPServer(('', int(opts.port)),
                                CompilerHandler,
                                highlighters)
     server.serve_forever()
   except KeyboardInterrupt:
     server.socket.close()