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100 lines
3.2 KiB
100 lines
3.2 KiB
//===- TokenRewriter.cpp - Token-based code rewriting interface -----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the TokenRewriter class, which is used for code
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// transformations.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Rewrite/Core/TokenRewriter.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Lex/ScratchBuffer.h"
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#include "clang/Lex/Token.h"
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#include <cassert>
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#include <cstring>
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#include <map>
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#include <utility>
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using namespace clang;
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TokenRewriter::TokenRewriter(FileID FID, SourceManager &SM,
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const LangOptions &LangOpts) {
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ScratchBuf.reset(new ScratchBuffer(SM));
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// Create a lexer to lex all the tokens of the main file in raw mode.
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llvm::MemoryBufferRef FromFile = SM.getBufferOrFake(FID);
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Lexer RawLex(FID, FromFile, SM, LangOpts);
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// Return all comments and whitespace as tokens.
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RawLex.SetKeepWhitespaceMode(true);
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// Lex the file, populating our datastructures.
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Token RawTok;
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RawLex.LexFromRawLexer(RawTok);
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while (RawTok.isNot(tok::eof)) {
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#if 0
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if (Tok.is(tok::raw_identifier)) {
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// Look up the identifier info for the token. This should use
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// IdentifierTable directly instead of PP.
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PP.LookUpIdentifierInfo(Tok);
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}
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#endif
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AddToken(RawTok, TokenList.end());
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RawLex.LexFromRawLexer(RawTok);
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}
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}
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TokenRewriter::~TokenRewriter() = default;
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/// RemapIterator - Convert from token_iterator (a const iterator) to
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/// TokenRefTy (a non-const iterator).
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TokenRewriter::TokenRefTy TokenRewriter::RemapIterator(token_iterator I) {
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if (I == token_end()) return TokenList.end();
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// FIXME: This is horrible, we should use our own list or something to avoid
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// this.
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std::map<SourceLocation, TokenRefTy>::iterator MapIt =
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TokenAtLoc.find(I->getLocation());
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assert(MapIt != TokenAtLoc.end() && "iterator not in rewriter?");
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return MapIt->second;
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}
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/// AddToken - Add the specified token into the Rewriter before the other
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/// position.
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TokenRewriter::TokenRefTy
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TokenRewriter::AddToken(const Token &T, TokenRefTy Where) {
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Where = TokenList.insert(Where, T);
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bool InsertSuccess = TokenAtLoc.insert(std::make_pair(T.getLocation(),
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Where)).second;
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assert(InsertSuccess && "Token location already in rewriter!");
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(void)InsertSuccess;
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return Where;
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}
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TokenRewriter::token_iterator
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TokenRewriter::AddTokenBefore(token_iterator I, const char *Val) {
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unsigned Len = strlen(Val);
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// Plop the string into the scratch buffer, then create a token for this
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// string.
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Token Tok;
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Tok.startToken();
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const char *Spelling;
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Tok.setLocation(ScratchBuf->getToken(Val, Len, Spelling));
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Tok.setLength(Len);
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// TODO: Form a whole lexer around this and relex the token! For now, just
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// set kind to tok::unknown.
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Tok.setKind(tok::unknown);
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return AddToken(Tok, RemapIterator(I));
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}
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