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//===--- PTHLexer.cpp - Lex from a token stream ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the PTHLexer interface.
//
//===----------------------------------------------------------------------===//
#include "clang/Lex/PTHLexer.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Basic/TokenKinds.h"
using namespace clang;
PTHLexer::PTHLexer(Preprocessor& pp, SourceLocation fileloc,
const Token *TokArray, unsigned NumToks)
: PreprocessorLexer(&pp, fileloc), FileLoc(fileloc),
Tokens(TokArray), NumTokens(NumToks), CurToken(0) {
assert (Tokens[NumTokens-1].is(tok::eof));
--NumTokens;
LexingRawMode = false;
ParsingPreprocessorDirective = false;
ParsingFilename = false;
}
void PTHLexer::Lex(Token& Tok) {
if (CurToken == NumTokens) {
// If we hit the end of the file while parsing a preprocessor directive,
// end the preprocessor directive first. The next token returned will
// then be the end of file.
// OR
// If we are in raw mode, return this event as an EOF token. Let the caller
// that put us in raw mode handle the event.
if (ParsingPreprocessorDirective || LexingRawMode) {
// Done parsing the "line".
ParsingPreprocessorDirective = false;
Tok = Tokens[CurToken]; // not an out-of-bound access
// FIXME: eom handling?
}
else
PP->HandleEndOfFile(Tok, false);
return;
}
Tok = Tokens[CurToken];
if (ParsingPreprocessorDirective && Tok.isAtStartOfLine()) {
ParsingPreprocessorDirective = false; // Done parsing the "line".
MIOpt.ReadToken();
// FIXME: Need to replicate:
// FormTokenWithChars(Tok, CurPtr, tok::eom);
Tok.setKind(tok::eom);
return;
}
else // Otherwise, advance to the next token.
++CurToken;
if (Tok.isAtStartOfLine() && Tok.is(tok::hash) && !LexingRawMode) {
PP->HandleDirective(Tok);
PP->Lex(Tok);
return;
}
MIOpt.ReadToken();
}
void PTHLexer::setEOF(Token& Tok) {
Tok = Tokens[NumTokens]; // NumTokens is already adjusted, so this isn't
// an overflow.
}
void PTHLexer::DiscardToEndOfLine() {
assert(ParsingPreprocessorDirective && ParsingFilename == false &&
"Must be in a preprocessing directive!");
// Already at end-of-file?
if (CurToken == NumTokens)
return;
// Find the first token that is not the start of the *current* line.
for ( ++CurToken; CurToken != NumTokens ; ++CurToken )
if (Tokens[CurToken].isAtStartOfLine())
return;
}
unsigned PTHLexer::isNextPPTokenLParen() {
if (CurToken == NumTokens)
return 2;
return Tokens[CurToken].is(tok::l_paren);
}
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