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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 NumTokens)
: PreprocessorLexer(&pp, fileloc),
Tokens(TokArray),
LastTokenIdx(NumTokens - 1),
CurTokenIdx(0) {
assert(NumTokens >= 1);
assert(Tokens[LastTokenIdx].is(tok::eof));
}
void PTHLexer::Lex(Token& Tok) {
LexNextToken:
if (AtLastToken()) {
if (ParsingPreprocessorDirective) {
ParsingPreprocessorDirective = false;
Tok = GetToken();
Tok.setKind(tok::eom);
MIOpt.ReadToken();
return;
}
assert(!LexingRawMode && "PTHLexer cannot lex in raw mode.");
// FIXME: Issue diagnostics similar to Lexer.
PP->HandleEndOfFile(Tok, false);
return;
}
Tok = GetToken();
// Don't advance to the next token yet. Check if we are at the
// start of a new line and we're processing a directive. If so, we
// consume this token twice, once as an tok::eom.
if (Tok.isAtStartOfLine() && ParsingPreprocessorDirective) {
ParsingPreprocessorDirective = false;
Tok.setKind(tok::eom);
MIOpt.ReadToken();
return;
}
// Advance to the next token.
AdvanceToken();
if (Tok.is(tok::hash)) {
if (Tok.isAtStartOfLine() && !LexingRawMode) {
PP->HandleDirective(Tok);
if (PP->isCurrentLexer(this))
goto LexNextToken;
return PP->Lex(Tok);
}
}
MIOpt.ReadToken();
if (Tok.is(tok::identifier)) {
if (LexingRawMode) return;
return PP->HandleIdentifier(Tok);
}
}
void PTHLexer::setEOF(Token& Tok) {
Tok = Tokens[LastTokenIdx];
}
void PTHLexer::DiscardToEndOfLine() {
assert(ParsingPreprocessorDirective && ParsingFilename == false &&
"Must be in a preprocessing directive!");
// Already at end-of-file?
if (AtLastToken())
return;
// Find the first token that is not the start of the *current* line.
for (AdvanceToken(); !AtLastToken(); AdvanceToken())
if (GetToken().isAtStartOfLine())
return;
}
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