Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/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 "base/basictypes.h"
-#include "base/logging.h"
-#include "base/strings/string_piece.h"
-#include "tools/gn/err.h"
-
-class ParseNode;
-
-// Represents a variable value in the interpreter.
-class Value {
- public:
-  enum Type {
-    NONE = 0,
-    INTEGER,
-    STRING,
-    LIST
-  };
-
-  Value();
-  Value(const ParseNode* origin, Type t);
-  Value(const ParseNode* origin, int64 int_val);
-  Value(const ParseNode* origin, const base::StringPiece& str_val);
-  ~Value();
-
-  Type type() const { return type_; }
-
-  // Returns a string describing the given type.
-  static const char* DescribeType(Type t);
-
-  // Returns the node that made this. May be NULL.
-  const ParseNode* origin() const { return origin_; }
-  void set_origin(const ParseNode* o) { origin_ = o; }
-
-  int64& int_value() {
-    DCHECK(type_ == INTEGER);
-    return int_value_;
-  }
-  const int64& int_value() const {
-    DCHECK(type_ == INTEGER);
-    return int_value_;
-  }
-
-  std::string& string_value() {
-    DCHECK(type_ == STRING);
-    return string_value_;
-  }
-  const std::string& string_value() const {
-    DCHECK(type_ == STRING);
-    return string_value_;
-  }
-
-  std::vector<Value>& list_value() {
-    DCHECK(type_ == LIST);
-    return list_value_;
-  }
-  const std::vector<Value>& list_value() const {
-    DCHECK(type_ == LIST);
-    return list_value_;
-  }
-
-  // Returns the current value converted to an int, normally used for
-  // boolean operations. Undefined variables, empty lists, and empty strings
-  // are all interpreted as 0, otherwise 1.
-  int64 InterpretAsInt() const;
-
-  // Converts the given value to a string.
-  std::string ToString() 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:
-  Type type_;
-  std::string string_value_;
-  int64 int_value_;
-  std::vector<Value> list_value_;
-  const ParseNode* origin_;
-};
-
-#endif  // TOOLS_GN_VALUE_H_