Redo GN "args" command

tools/gn/value.h

 // 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.
 
 #ifndef TOOLS_GN_VALUE_H_
 #define TOOLS_GN_VALUE_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 88 matching lines @@
     DCHECK(type_ == SCOPE);
     return scope_value_.get();
   }
   const Scope* scope_value() const {
     DCHECK(type_ == SCOPE);
     return scope_value_.get();
   }
   void SetScopeValue(scoped_ptr<Scope> scope);
 
   // Converts the given value to a string. Returns true if strings should be
-  // quoted or the ToString of a string should be the string itself.
+  // quoted or the ToString of a string should be the string itself. If the
+  // string is quoted, it will also enable escaping.
   std::string ToString(bool quote_strings) const;
 
   // Verifies that the value is of the given type. If it isn't, returns
   // false and sets the error.
   bool VerifyTypeIs(Type t, Err* err) const;
 
   // Compares values. Only the "value" is compared, not the origin.
   bool operator==(const Value& other) const;
   bool operator!=(const Value& other) const;
 
  private:
   // This are a lot of objects associated with every Value that need
   // initialization and tear down every time. It might be more efficient to
   // create a union of ManualConstructor objects (see SmallMap) and only
   // use the one we care about.
   Type type_;
   std::string string_value_;
   bool boolean_value_;
   int64 int_value_;
   std::vector<Value> list_value_;
   scoped_ptr<Scope> scope_value_;
 
   const ParseNode* origin_;
 };
 
 #endif  // TOOLS_GN_VALUE_H_