| // 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_ |