Add support for reading .gypi files.

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"
+#include "tools/gn/scope.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)
+Value::Value(const ParseNode* origin, scoped_ptr<Scope> scope)
     : type_(SCOPE),
       string_value_(),
       boolean_value_(false),
       int_value_(0),
-      scope_value_(scope),
+      scope_value_(scope.Pass()),
       origin_(origin) {
 }
 
+Value::Value(const Value& other)
+    : type_(other.type_),
+      string_value_(other.string_value_),
+      boolean_value_(other.boolean_value_),
+      int_value_(other.int_value_),
+      list_value_(other.list_value_),
+      origin_(other.origin_) {
+  if (type() == SCOPE && other.scope_value_.get())
+    scope_value_ = other.scope_value_->MakeClosure();
+}
+
 Value::~Value() {
 }
 
+Value& Value::operator=(const Value& other) {
+  type_ = other.type_;
+  string_value_ = other.string_value_;
+  boolean_value_ = other.boolean_value_;
+  int_value_ = other.int_value_;
+  list_value_ = other.list_value_;
+  if (type() == SCOPE && other.scope_value_.get())
+    scope_value_ = other.scope_value_->MakeClosure();
+  origin_ = other.origin_;
+  return *this;
+}
+
 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";
   }
 }
 
+void Value::SetScopeValue(scoped_ptr<Scope> scope) {
+  DCHECK(type_ == SCOPE);
+  scope_value_ = scope.Pass();
+}
+
 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)
@@ skipping 36 matching lines @@
       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();
+      // Scopes are always considered not equal because there's currently
+      // no use case for comparing them, and it requires a bunch of complex
+      // iteration code.
+      return false;
     default:
       return false;
   }
 }
 
 bool Value::operator!=(const Value& other) const {
   return !operator==(other);
 }