Add "." accessors to GN.

tools/gn/tokenizer.cc

 // Copyright (c) 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.
 
 #include "tools/gn/tokenizer.h"
 
 #include "base/logging.h"
 #include "tools/gn/input_file.h"
 
 namespace {
@@ skipping 46 matching lines @@
   if (value == "<")
     return Token::LESS_THAN;
   if (value == ">")
     return Token::GREATER_THAN;
   if (value == "&&")
     return Token::BOOLEAN_AND;
   if (value == "||")
     return Token::BOOLEAN_OR;
   if (value == "!")
     return Token::BANG;
+  if (value == ".")
+    return Token::DOT;
   return Token::INVALID;
 }
 
 }  // namespace
 
 Tokenizer::Tokenizer(const InputFile* input_file, Err* err)
     : input_file_(input_file),
       input_(input_file->contents()),
       err_(err),
       cur_(0),
@@ skipping 112 matching lines @@
     return Token::RIGHT_BRACKET;
   if (next_char == '(')
     return Token::LEFT_PAREN;
   if (next_char == ')')
     return Token::RIGHT_PAREN;
   if (next_char == '{')
     return Token::LEFT_BRACE;
   if (next_char == '}')
     return Token::RIGHT_BRACE;
 
+  if (next_char == '.')
+    return Token::DOT;
   if (next_char == ',')
     return Token::COMMA;
 
   if (next_char == '#')
     return Token::COMMENT;
 
   // For the case of '-' differentiate between a negative number and anything
   // else.
   if (next_char == '-') {
     if (!CanIncrement())
@@ skipping 67 matching lines @@
       while (!at_end() && IsIdentifierContinuingChar(cur_char()))
         Advance();
       break;
 
     case Token::LEFT_BRACKET:
     case Token::RIGHT_BRACKET:
     case Token::LEFT_BRACE:
     case Token::RIGHT_BRACE:
     case Token::LEFT_PAREN:
     case Token::RIGHT_PAREN:
+    case Token::DOT:
     case Token::COMMA:
       Advance();  // All are one char.
       break;
 
     case Token::COMMENT:
       // Eat to EOL.
       while (!at_end() && !IsCurrentNewline())
         Advance();
       break;
 
@@ skipping 60 matching lines @@
   } else if (cur_char() == '/' && cur_ + 1 < input_.size() &&
       (input_[cur_ + 1] == '/' || input_[cur_ + 1] == '*')) {
     // Different types of comments.
     help = "Comments should start with # instead";
   } else {
     help = "I have no idea what this is.";
   }
 
   return Err(location, "Invalid token.", help);
 }