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Add Peek

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Add a peek function to let the Lexer look at a character arbitrarily
far ahead in the stream without consuming anything.  We need this to
disambiguate numbers and operands of a paste operation.  For example:

def foo#8i

Without lookahead the lexer will treat '8' as a number rather than as
part of a string to be pasted to form an identifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142512 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Greene 2011-10-19 13:03:35 +00:00
parent 9c42bcf2ca
commit a761f92cd3
2 changed files with 5 additions and 0 deletions
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4
lib/TableGen/TGLexer.cpp
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@ -80,6 +80,10 @@ int TGLexer::getNextChar() {
}
}
int TGLexer::peekNextChar(int Index) {
return *(CurPtr + Index);
}
tgtok::TokKind TGLexer::LexToken() {
TokStart = CurPtr;
// This always consumes at least one character.

1
lib/TableGen/TGLexer.h
View File

@ -109,6 +109,7 @@ private:
tgtok::TokKind ReturnError(const char *Loc, const Twine &Msg);
int getNextChar();
int peekNextChar(int Index);
void SkipBCPLComment();
bool SkipCComment();
tgtok::TokKind LexIdentifier();