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//
// Copyright (c) 2012 The ANGLE Project 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 COMPILER_PREPROCESSOR_MACRO_EXPANDER_H_
#define COMPILER_PREPROCESSOR_MACRO_EXPANDER_H_
#include <cassert>
#include <memory>
#include <vector>
#include "Lexer.h"
#include "Macro.h"
#include "pp_utils.h"
namespace pp
{
class Diagnostics;
class MacroExpander : public Lexer
{
public:
MacroExpander(Lexer* lexer, MacroSet* macroSet, Diagnostics* diagnostics);
virtual ~MacroExpander();
virtual void lex(Token* token);
private:
PP_DISALLOW_COPY_AND_ASSIGN(MacroExpander);
void getToken(Token* token);
void ungetToken(const Token& token);
bool isNextTokenLeftParen();
bool pushMacro(const Macro& macro, const Token& identifier);
void popMacro();
bool expandMacro(const Macro& macro,
const Token& identifier,
std::vector<Token>* replacements);
typedef std::vector<Token> MacroArg;
bool collectMacroArgs(const Macro& macro,
const Token& identifier,
std::vector<MacroArg>* args);
void replaceMacroParams(const Macro& macro,
const std::vector<MacroArg>& args,
std::vector<Token>* replacements);
struct MacroContext
{
const Macro* macro;
std::size_t index;
std::vector<Token> replacements;
MacroContext() : macro(0), index(0) { }
bool empty() const { return index == replacements.size(); }
const Token& get() { return replacements[index++]; }
void unget() { assert(index > 0); --index; }
};
Lexer* mLexer;
MacroSet* mMacroSet;
Diagnostics* mDiagnostics;
std::auto_ptr<Token> mReserveToken;
std::vector<MacroContext*> mContextStack;
};
} // namespace pp
#endif // COMPILER_PREPROCESSOR_MACRO_EXPANDER_H_
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