1 //===- TokenRewriter.cpp - Token-based code rewriting interface -----------===//
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
7 //===----------------------------------------------------------------------===//
9 // This file implements the TokenRewriter class, which is used for code
12 //===----------------------------------------------------------------------===//
14 #include "clang/Rewrite/Core/TokenRewriter.h"
15 #include "clang/Basic/SourceManager.h"
16 #include "clang/Lex/Lexer.h"
17 #include "clang/Lex/ScratchBuffer.h"
18 #include "clang/Lex/Token.h"
24 using namespace clang;
26 TokenRewriter::TokenRewriter(FileID FID, SourceManager &SM,
27 const LangOptions &LangOpts) {
28 ScratchBuf.reset(new ScratchBuffer(SM));
30 // Create a lexer to lex all the tokens of the main file in raw mode.
31 const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
32 Lexer RawLex(FID, FromFile, SM, LangOpts);
34 // Return all comments and whitespace as tokens.
35 RawLex.SetKeepWhitespaceMode(true);
37 // Lex the file, populating our datastructures.
39 RawLex.LexFromRawLexer(RawTok);
40 while (RawTok.isNot(tok::eof)) {
42 if (Tok.is(tok::raw_identifier)) {
43 // Look up the identifier info for the token. This should use
44 // IdentifierTable directly instead of PP.
45 PP.LookUpIdentifierInfo(Tok);
49 AddToken(RawTok, TokenList.end());
50 RawLex.LexFromRawLexer(RawTok);
54 TokenRewriter::~TokenRewriter() = default;
56 /// RemapIterator - Convert from token_iterator (a const iterator) to
57 /// TokenRefTy (a non-const iterator).
58 TokenRewriter::TokenRefTy TokenRewriter::RemapIterator(token_iterator I) {
59 if (I == token_end()) return TokenList.end();
61 // FIXME: This is horrible, we should use our own list or something to avoid
63 std::map<SourceLocation, TokenRefTy>::iterator MapIt =
64 TokenAtLoc.find(I->getLocation());
65 assert(MapIt != TokenAtLoc.end() && "iterator not in rewriter?");
69 /// AddToken - Add the specified token into the Rewriter before the other
71 TokenRewriter::TokenRefTy
72 TokenRewriter::AddToken(const Token &T, TokenRefTy Where) {
73 Where = TokenList.insert(Where, T);
75 bool InsertSuccess = TokenAtLoc.insert(std::make_pair(T.getLocation(),
77 assert(InsertSuccess && "Token location already in rewriter!");
82 TokenRewriter::token_iterator
83 TokenRewriter::AddTokenBefore(token_iterator I, const char *Val) {
84 unsigned Len = strlen(Val);
86 // Plop the string into the scratch buffer, then create a token for this
91 Tok.setLocation(ScratchBuf->getToken(Val, Len, Spelling));
94 // TODO: Form a whole lexer around this and relex the token! For now, just
95 // set kind to tok::unknown.
96 Tok.setKind(tok::unknown);
98 return AddToken(Tok, RemapIterator(I));