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C++: Avoid looking ahead when lexing u8"literal"

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This makes things slightly more efficient. But it will be more
significant when we introduce R"rawliterals" since we would avoid
an even further lookahead for cases like u8R"string".

Change-Id: Id4bad8b917752d23daf2f4989330434979cf602f
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
Reviewed-by: hjk <qthjk@ovi.com>
This commit is contained in:
Leandro Melo
2012-08-16 19:18:20 +02:00
parent a590087749
commit b9d15f1296
2 changed files with 7 additions and 11 deletions
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16
src/libs/3rdparty/cplusplus/Lexer.cpp vendored
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@@ -580,19 +580,15 @@ void Lexer::scan_helper(Token *tok)
yyinp();
scanCharLiteral(tok, ch);
} else if (ch == 'u' && _yychar == '8') {
unsigned char la = 0;
if (_currentChar + 1 != _lastChar)
la = *(_currentChar + 1);
if (la == '"') {
yyinp();
yyinp();
if (_yychar == '"') {
yyinp();
scanStringLiteral(tok, '8');
} else if (la == '\'') {
yyinp();
} else if (_yychar == '\'') {
yyinp();
scanCharLiteral(tok, '8');
} else {
scanIdentifier(tok);
scanIdentifier(tok, 1);
}
} else {
scanIdentifier(tok);
@@ -691,9 +687,9 @@ void Lexer::scanNumericLiteral(Token *tok)
tok->number = control()->numericLiteral(yytext, yylen);
}
void Lexer::scanIdentifier(Token *tok)
void Lexer::scanIdentifier(Token *tok, unsigned extraProcessedChars)
{
const char *yytext = _currentChar - 1;
const char *yytext = _currentChar - 1 - extraProcessedChars;
while (std::isalnum(_yychar) || _yychar == '_' || _yychar == '$')
yyinp();
int yylen = _currentChar - yytext;

2
src/libs/3rdparty/cplusplus/Lexer.h vendored
View File

@@ -94,7 +94,7 @@ private:
void scanCharLiteral(Token *tok, unsigned char hint = 0);
void scanUntilQuote(Token *tok, unsigned char quote);
void scanNumericLiteral(Token *tok);
void scanIdentifier(Token *tok);
void scanIdentifier(Token *tok, unsigned extraProcessedChars = 0);
inline void yyinp()
{