blob: 8802bffb157b29f9b4eaef5b3e6faf15c1af6102 [file] [log] [blame]
// 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 "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 {
enum Type {
NONE = 0,
Value(const ParseNode* origin, Type t);
Value(const ParseNode* origin, int64 int_val);
Value(const ParseNode* origin, const base::StringPiece& str_val);
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() {
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_;
// 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;
Type type_;
std::string string_value_;
int64 int_value_;
std::vector<Value> list_value_;
const ParseNode* origin_;
#endif // TOOLS_GN_VALUE_H_