parseCaret extract ^ statements
()
| 356 | |
| 357 | // parseCaret extract ^ statements |
| 358 | func (p *Parser) parseCaret() (Revisioner, error) { |
| 359 | var tok token |
| 360 | var lit string |
| 361 | var err error |
| 362 | |
| 363 | tok, lit, err = p.scan() |
| 364 | |
| 365 | if err != nil { |
| 366 | return nil, err |
| 367 | } |
| 368 | |
| 369 | switch { |
| 370 | case tok == obrace: |
| 371 | r, err := p.parseCaretBraces() |
| 372 | |
| 373 | if err != nil { |
| 374 | return nil, err |
| 375 | } |
| 376 | |
| 377 | return r, nil |
| 378 | case tok == number: |
| 379 | n, _ := strconv.Atoi(lit) |
| 380 | |
| 381 | if n > 2 { |
| 382 | return nil, &ErrInvalidRevision{fmt.Sprintf(`"%s" found must be 0, 1 or 2 after "^"`, lit)} |
| 383 | } |
| 384 | |
| 385 | return CaretPath{n}, nil |
| 386 | default: |
| 387 | p.unscan() |
| 388 | return CaretPath{1}, nil |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | // parseCaretBraces extract ^{<data>} statements |
| 393 | func (p *Parser) parseCaretBraces() (Revisioner, error) { |