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//===- TokenRewriter.h - Token-based Rewriter -------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the TokenRewriter class, which is used for code
// transformations.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_REWRITE_CORE_TOKENREWRITER_H
#define LLVM_CLANG_REWRITE_CORE_TOKENREWRITER_H
#include "clang/Basic/SourceLocation.h"
#include "clang/Lex/Token.h"
#include <cassert>
#include <list>
#include <map>
#include <memory>
namespace clang {
class LangOptions;
class ScratchBuffer;
class SourceManager;
class TokenRewriter {
/// TokenList - This is the list of raw tokens that make up this file. Each
/// of these tokens has a unique SourceLocation, which is a FileID.
std::list<Token> TokenList;
/// TokenRefTy - This is the type used to refer to a token in the TokenList.
using TokenRefTy = std::list<Token>::iterator;
/// TokenAtLoc - This map indicates which token exists at a specific
/// SourceLocation. Since each token has a unique SourceLocation, this is a
/// one to one map. The token can return its own location directly, to map
/// backwards.
std::map<SourceLocation, TokenRefTy> TokenAtLoc;
/// ScratchBuf - This is the buffer that we create scratch tokens from.
std::unique_ptr<ScratchBuffer> ScratchBuf;
public:
/// TokenRewriter - This creates a TokenRewriter for the file with the
/// specified FileID.
TokenRewriter(FileID FID, SourceManager &SM, const LangOptions &LO);
TokenRewriter(const TokenRewriter &) = delete;
TokenRewriter &operator=(const TokenRewriter &) = delete;
~TokenRewriter();
using token_iterator = std::list<Token>::const_iterator;
token_iterator token_begin() const { return TokenList.begin(); }
token_iterator token_end() const { return TokenList.end(); }
token_iterator AddTokenBefore(token_iterator I, const char *Val);
token_iterator AddTokenAfter(token_iterator I, const char *Val) {
assert(I != token_end() && "Cannot insert after token_end()!");
return AddTokenBefore(++I, Val);
}
private:
/// RemapIterator - Convert from token_iterator (a const iterator) to
/// TokenRefTy (a non-const iterator).
TokenRefTy RemapIterator(token_iterator I);
/// AddToken - Add the specified token into the Rewriter before the other
/// position.
TokenRefTy AddToken(const Token &T, TokenRefTy Where);
};
} // namespace clang
#endif // LLVM_CLANG_REWRITE_CORE_TOKENREWRITER_H
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