public void matchRange(int a, int b) throws MismatchedRangeException {
if (input.LA(1) < a || input.LA(1) > b) {
if (state.backtracking > 0) {
state.failed = true;
return;
}
MismatchedRangeException mre = new MismatchedRangeException(a, b, input);
recover(mre);
throw mre;
}
input.consume();
state.failed = false;
}
public void match(int c) throws MismatchedTokenException {
if (input.LA(1) != c) {
if (state.backtracking > 0) {
state.failed = true;
return;
}
MismatchedTokenException mte = new MismatchedTokenException(c, input);
recover(mte); // don't really recover; just consume in lexer
throw mte;
}
input.consume();
state.failed = false;
}
public void match(String s) throws MismatchedTokenException {
int i = 0;
while (i < s.length()) {
if (input.LA(1) != s.charAt(i)) {
if (state.backtracking > 0) {
state.failed = true;
return;
}
MismatchedTokenException mte = new MismatchedTokenException(s.charAt(i), input);
recover(mte);
throw mte;
}
i++;
input.consume();
state.failed = false;
}
}
/**
* Lexers can normally match any char in it's vocabulary after matching a token, so do the easy
* thing and just kill a character and hope it all works out. You can instead use the rule
* invocation stack to do sophisticated error recovery if you are in a fragment rule.
*/
public void recover(RecognitionException re) {
// System.out.println("consuming char "+(char)input.LA(1)+" during recovery");
// re.printStackTrace();
input.consume();
}
public void matchAny() {
input.consume();
}