| 393 | |
| 394 | |
| 395 | LPexp * |
| 396 | Parser::parseModifier(LPexp *e) |
| 397 | { |
| 398 | if (hasInput()) { |
| 399 | if (head() == '*') { |
| 400 | next(); |
| 401 | return new lpexp::Repeat(e); |
| 402 | } else if (head() == '{') { |
| 403 | std::pair<int, int> range = parseRange(); |
| 404 | if (error()) return NULL; |
| 405 | if (range.second < 0) { |
| 406 | lpexp::Cat *cat = new lpexp::Cat(); |
| 407 | cat->append(new lpexp::NRepeat(e, range.first, range.first)); |
| 408 | cat->append(new lpexp::Repeat(e->clone())); |
| 409 | return cat; |
| 410 | } else |
| 411 | return new lpexp::NRepeat(e, range.first, range.second); |
| 412 | } else if (head() == '+') { |
| 413 | next(); |
| 414 | lpexp::Cat *cat = new lpexp::Cat(); |
| 415 | cat->append(e); |
| 416 | cat->append(new lpexp::Repeat(e->clone())); |
| 417 | return cat; |
| 418 | } else |
| 419 | return e; |
| 420 | } |
| 421 | else |
| 422 | return e; |
| 423 | } |
| 424 | |
| 425 | |
| 426 | |