1//===- TokenRewriter.h - Token-based Rewriter -------------------*- C++ -*-===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file defines the TokenRewriter class, which is used for code 10// transformations. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_REWRITE_CORE_TOKENREWRITER_H 15#define LLVM_CLANG_REWRITE_CORE_TOKENREWRITER_H 16 17#include "clang/Basic/SourceLocation.h" 18#include "clang/Lex/Token.h" 19#include <cassert> 20#include <list> 21#include <map> 22#include <memory> 23 24namespace clang { 25 26class LangOptions; 27class ScratchBuffer; 28class SourceManager; 29 30 class TokenRewriter { 31 /// TokenList - This is the list of raw tokens that make up this file. Each 32 /// of these tokens has a unique SourceLocation, which is a FileID. 33 std::list<Token> TokenList; 34 35 /// TokenRefTy - This is the type used to refer to a token in the TokenList. 36 using TokenRefTy = std::list<Token>::iterator; 37 38 /// TokenAtLoc - This map indicates which token exists at a specific 39 /// SourceLocation. Since each token has a unique SourceLocation, this is a 40 /// one to one map. The token can return its own location directly, to map 41 /// backwards. 42 std::map<SourceLocation, TokenRefTy> TokenAtLoc; 43 44 /// ScratchBuf - This is the buffer that we create scratch tokens from. 45 std::unique_ptr<ScratchBuffer> ScratchBuf; 46 47 public: 48 /// TokenRewriter - This creates a TokenRewriter for the file with the 49 /// specified FileID. 50 TokenRewriter(FileID FID, SourceManager &SM, const LangOptions &LO); 51 52 TokenRewriter(const TokenRewriter &) = delete; 53 TokenRewriter &operator=(const TokenRewriter &) = delete; 54 ~TokenRewriter(); 55 56 using token_iterator = std::list<Token>::const_iterator; 57 58 token_iterator token_begin() const { return TokenList.begin(); } 59 token_iterator token_end() const { return TokenList.end(); } 60 61 token_iterator AddTokenBefore(token_iterator I, const char *Val); 62 63 token_iterator AddTokenAfter(token_iterator I, const char *Val) { 64 assert(I != token_end() && "Cannot insert after token_end()!"); 65 return AddTokenBefore(++I, Val); 66 } 67 68 private: 69 /// RemapIterator - Convert from token_iterator (a const iterator) to 70 /// TokenRefTy (a non-const iterator). 71 TokenRefTy RemapIterator(token_iterator I); 72 73 /// AddToken - Add the specified token into the Rewriter before the other 74 /// position. 75 TokenRefTy AddToken(const Token &T, TokenRefTy Where); 76 }; 77 78} // namespace clang 79 80#endif // LLVM_CLANG_REWRITE_CORE_TOKENREWRITER_H 81