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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_MACROEXPANDER_H_
#define COMPILER_PREPROCESSOR_MACROEXPANDER_H_
#include <cassert>
#include <memory>
#include <vector>
#include "Lexer.h"
#include "Macro.h"
#include "pp_utils.h"
namespace pp
{
class Diagnostics;
struct SourceLocation;
class MacroExpander : public Lexer
{
public:
MacroExpander(Lexer *lexer, MacroSet *macroSet, Diagnostics *diagnostics, bool parseDefined);
~MacroExpander() override;
void lex(Token *token) override;
private:
PP_DISALLOW_COPY_AND_ASSIGN(MacroExpander);
void getToken(Token *token);
void ungetToken(const Token &token);
bool isNextTokenLeftParen();
bool pushMacro(const Macro ¯o, const Token &identifier);
void popMacro();
bool expandMacro(const Macro ¯o,
const Token &identifier,
std::vector<Token> *replacements);
typedef std::vector<Token> MacroArg;
bool collectMacroArgs(const Macro ¯o,
const Token &identifier,
std::vector<MacroArg> *args,
SourceLocation *closingParenthesisLocation);
void replaceMacroParams(const Macro ¯o,
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;
bool mParseDefined;
std::unique_ptr<Token> mReserveToken;
std::vector<MacroContext *> mContextStack;
};
} // namespace pp
#endif // COMPILER_PREPROCESSOR_MACROEXPANDER_H_
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