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