| // 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 <stdint.h> |
| |
| #include <map> |
| #include <memory> |
| |
| #include "base/logging.h" |
| #include "gn/err.h" |
| |
| class ParseNode; |
| class Scope; |
| |
| // Represents a variable value in the interpreter. |
| class Value { |
| public: |
| enum Type { |
| NONE = 0, |
| BOOLEAN, |
| INTEGER, |
| STRING, |
| LIST, |
| SCOPE, |
| }; |
| |
| Value(); |
| Value(const ParseNode* origin, Type t); |
| Value(const ParseNode* origin, bool bool_val); |
| Value(const ParseNode* origin, int64_t 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, std::unique_ptr<Scope> scope); |
| |
| Value(const Value& other); |
| Value(Value&& other) noexcept; |
| ~Value(); |
| |
| Value& operator=(const Value& other); |
| Value& operator=(Value&& other) noexcept; |
| |
| 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; } |
| |
| bool& boolean_value() { |
| DCHECK(type_ == BOOLEAN); |
| return boolean_value_; |
| } |
| const bool& boolean_value() const { |
| DCHECK(type_ == BOOLEAN); |
| return boolean_value_; |
| } |
| |
| int64_t& int_value() { |
| DCHECK(type_ == INTEGER); |
| return int_value_; |
| } |
| const int64_t& 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_; |
| } |
| |
| Scope* scope_value() { |
| DCHECK(type_ == SCOPE); |
| return scope_value_.get(); |
| } |
| const Scope* scope_value() const { |
| DCHECK(type_ == SCOPE); |
| return scope_value_.get(); |
| } |
| void SetScopeValue(std::unique_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. Scope |
| // values check only the contents of the current scope, and do not go to |
| // parent scopes. |
| bool operator==(const Value& other) const; |
| bool operator!=(const Value& other) const; |
| |
| private: |
| void Deallocate(); |
| |
| Type type_ = NONE; |
| const ParseNode* origin_ = nullptr; |
| |
| union { |
| bool boolean_value_; |
| int64_t int_value_; |
| std::string string_value_; |
| std::vector<Value> list_value_; |
| std::unique_ptr<Scope> scope_value_; |
| }; |
| }; |
| |
| #endif // TOOLS_GN_VALUE_H_ |