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// 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 <map>
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_piece.h"
#include "tools/gn/err.h"
class ParseNode;
class Scope;
// Represents a variable value in the interpreter.
class Value {
enum Type {
NONE = 0,
Value(const ParseNode* origin, Type t);
Value(const ParseNode* origin, bool bool_val);
Value(const ParseNode* origin, int64 int_val);
Value(const ParseNode* origin, std::string str_val);
Value(const ParseNode* origin, const char* str_val);
// Values "shouldn't" have null scopes when type == Scope, so be sure to
// always set one. However, this is not asserted since there are some
// use-cases for creating values and immediately setting the scope on it. So
// you can pass a null scope here if you promise to set it before any other
// code gets it (code will generally assume the scope is not null).
Value(const ParseNode* origin, scoped_ptr<Scope> scope);
Value(const Value& other);
Value& operator=(const Value& other);
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; }
// Sets the origin of this value, recursively going into list child
// values and also setting their origins.
void RecursivelySetOrigin(const ParseNode* o);
bool& boolean_value() {
return boolean_value_;
const bool& boolean_value() const {
return boolean_value_;
int64& int_value() {
return int_value_;
const int64& int_value() const {
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_;
Scope* scope_value() {
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. 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;
// 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_