Mojo: Mojom: Test the parser when there's no module declared.

mojo/public/tools/bindings/pylib/parse/mojo_parser.py

 #!/usr/bin/env python
 # Copyright 2013 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.
 
 """Generates a syntax tree from a Mojo IDL file."""
 
 
 import sys
 import os.path
@@ skipping 38 matching lines @@
                eof=False):
     self.filename = filename
     self.lineno = lineno
     self.snippet = snippet
     self.bad_char = bad_char
     self.eof = eof
 
   def __str__(self):
     return "%s: Error: Unexpected end of file" % self.filename if self.eof \
         else "%s:%d: Error: Unexpected %r:\n%s" % (
-            self.filename, self.lineno + 1, self.bad_char, self.snippet)
+            self.filename, self.lineno, self.bad_char, self.snippet)
 
   def __repr__(self):
     return str(self)
 
 
 class Parser(object):
 
   def __init__(self, lexer, source, filename):
     self.tokens = lexer.tokens
     self.source = source
@@ skipping 257 matching lines @@
                 | CHAR_CONST
                 | STRING_LITERAL"""
     p[0] = _ListFromConcat(*p[1:])
 
   def p_error(self, e):
     if e is None:
       # Unexpected EOF.
       # TODO(vtl): Can we figure out what's missing?
       raise ParseError(self.filename, eof=True)
 
-    lineno = e.lineno + 1
-    snippet = self.source.split('\n')[lineno]
-    raise ParseError(self.filename, lineno=lineno, snippet=snippet,
+    snippet = self.source.split('\n')[e.lineno - 1]
+    raise ParseError(self.filename, lineno=e.lineno, snippet=snippet,
                      bad_char=e.value)
 
 
 def Parse(source, filename):
   lexer = Lexer(filename)
   parser = Parser(lexer, source, filename)
 
   lex.lex(object=lexer)
   yacc.yacc(module=parser, debug=0, write_tables=0)
 
@@ skipping 13 matching lines @@
         print Parse(f.read(), filename)
       except ParseError, e:
         print e
         return 1
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))