Add "." accessors to GN.

tools/gn/value.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/value.h"
 
 #include "base/strings/string_number_conversions.h"
 
 Value::Value()
     : type_(NONE),
       boolean_value_(false),
       int_value_(0),
+      scope_value_(NULL),
       origin_(NULL) {
 }
 
 Value::Value(const ParseNode* origin, Type t)
     : type_(t),
       boolean_value_(false),
       int_value_(0),
+      scope_value_(NULL),
       origin_(origin) {
 }
 
 Value::Value(const ParseNode* origin, bool bool_val)
     : type_(BOOLEAN),
       boolean_value_(bool_val),
       int_value_(0),
+      scope_value_(NULL),
       origin_(origin) {
 }
 
 Value::Value(const ParseNode* origin, int64 int_val)
     : type_(INTEGER),
       boolean_value_(false),
       int_value_(int_val),
+      scope_value_(NULL),
       origin_(origin) {
 }
 
 Value::Value(const ParseNode* origin, std::string str_val)
     : type_(STRING),
       string_value_(),
       boolean_value_(false),
       int_value_(0),
+      scope_value_(NULL),
       origin_(origin) {
   string_value_.swap(str_val);
 }
 
 Value::Value(const ParseNode* origin, const char* str_val)
     : type_(STRING),
       string_value_(str_val),
       boolean_value_(false),
       int_value_(0),
+      scope_value_(NULL),
       origin_(origin) {
 }
 
+Value::Value(const ParseNode* origin, Scope* scope)
+    : type_(SCOPE),
+      string_value_(),
+      boolean_value_(false),
+      int_value_(0),
+      scope_value_(scope),
+      origin_(origin) {
+}
+
 Value::~Value() {
 }
 
 void Value::RecursivelySetOrigin(const ParseNode* origin) {
   set_origin(origin);
   if (type_ == Value::LIST) {
     for (size_t i = 0; i < list_value_.size(); i++)
       list_value_[i].RecursivelySetOrigin(origin);
   }
 }
 
 // static
 const char* Value::DescribeType(Type t) {
   switch (t) {
     case NONE:
       return "none";
     case BOOLEAN:
       return "boolean";
     case INTEGER:
       return "integer";
     case STRING:
       return "string";
     case LIST:
       return "list";
+    case SCOPE:
+      return "scope";
     default:
       NOTREACHED();
       return "UNKNOWN";
   }
 }
 
 std::string Value::ToString(bool quote_string) const {
   switch (type_) {
     case NONE:
       return "<void>";
     case BOOLEAN:
       return boolean_value_ ? "true" : "false";
     case INTEGER:
       return base::Int64ToString(int_value_);
     case STRING:
       if (quote_string)
         return "\"" + string_value_ + "\"";
       return string_value_;
     case LIST: {
       std::string result = "[";
       for (size_t i = 0; i < list_value_.size(); i++) {
         if (i > 0)
           result += ", ";
         result += list_value_[i].ToString(true);
       }
       result.push_back(']');
       return result;
     }
+    case SCOPE:
+      return std::string("<scope>");
   }
   return std::string();
 }
 
 bool Value::VerifyTypeIs(Type t, Err* err) const {
   if (type_ == t)
     return true;
 
   *err = Err(origin(), std::string("This is not a ") + DescribeType(t) + ".");
   return false;
@@ skipping 11 matching lines @@
     case Value::STRING:
       return string_value() == other.string_value();
     case Value::LIST:
       if (list_value().size() != other.list_value().size())
         return false;
       for (size_t i = 0; i < list_value().size(); i++) {
         if (list_value()[i] != other.list_value()[i])
           return false;
       }
       return true;
+    case Value::SCOPE:
+      // Its not clear what people mean when comparing scope values, so we test
+      // for scope identity and not contents equality.
+      return scope_value() == other.scope_value();
     default:
       return false;
   }
 }
 
 bool Value::operator!=(const Value& other) const {
   return !operator==(other);
 }