/** @return 0: normal {n,m}, 2: fixed {n} !introduce returnCode here */
private int fetchRangeQuantifier() {
mark();
final boolean synAllow = syntax.allowInvalidInterval();
if (!left()) {
if (synAllow) {
return 1; /* "....{" : OK! */
}
throw new SyntaxException(ERR_END_PATTERN_AT_LEFT_BRACE);
}
if (!synAllow) {
c = peek();
if (c == ')' || c == '(' || c == '|') {
throw new SyntaxException(ERR_END_PATTERN_AT_LEFT_BRACE);
}
}
int low = scanUnsignedNumber();
if (low < 0) {
throw new SyntaxException(ErrorMessages.ERR_TOO_BIG_NUMBER_FOR_REPEAT_RANGE);
}
if (low > Config.MAX_REPEAT_NUM) {
throw new SyntaxException(ErrorMessages.ERR_TOO_BIG_NUMBER_FOR_REPEAT_RANGE);
}
boolean nonLow = false;
if (p == _p) {
/* can't read low */
if (syntax.allowIntervalLowAbbrev()) {
low = 0;
nonLow = true;
} else {
return invalidRangeQuantifier(synAllow);
}
}
if (!left()) {
return invalidRangeQuantifier(synAllow);
}
fetch();
int up;
int ret = 0;
if (c == ',') {
final int prev = p; // ??? last
up = scanUnsignedNumber();
if (up < 0) {
throw new ValueException(ERR_TOO_BIG_NUMBER_FOR_REPEAT_RANGE);
}
if (up > Config.MAX_REPEAT_NUM) {
throw new ValueException(ERR_TOO_BIG_NUMBER_FOR_REPEAT_RANGE);
}
if (p == prev) {
if (nonLow) {
return invalidRangeQuantifier(synAllow);
}
up = QuantifierNode.REPEAT_INFINITE; /* {n,} : {n,infinite} */
}
} else {
if (nonLow) {
return invalidRangeQuantifier(synAllow);
}
unfetch();
up = low; /* {n} : exact n times */
ret = 2; /* fixed */
}
if (!left()) {
return invalidRangeQuantifier(synAllow);
}
fetch();
if (syntax.opEscBraceInterval()) {
if (c != syntax.metaCharTable.esc) {
return invalidRangeQuantifier(synAllow);
}
fetch();
}
if (c != '}') {
return invalidRangeQuantifier(synAllow);
}
if (!isRepeatInfinite(up) && low > up) {
throw new ValueException(ERR_UPPER_SMALLER_THAN_LOWER_IN_REPEAT_RANGE);
}
token.type = TokenType.INTERVAL;
token.setRepeatLower(low);
token.setRepeatUpper(up);
return ret; /* 0: normal {n,m}, 2: fixed {n} */
}
