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/jEdit/tags/jedit-4-3-pre5/gnu/regexp/REToken.java

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Java | 68 lines | 37 code | 11 blank | 20 comment | 8 complexity | fbcbc88a570c7db21f2308f9ceb9801c MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
  1. /*
  2. * gnu/regexp/REToken.java
  3. * Copyright (C) 1998-2001 Wes Biggs
  4. *
  5. * This library is free software; you can redistribute it and/or modify
  6. * it under the terms of the GNU Lesser General Public License as published
  7. * by the Free Software Foundation; either version 2.1 of the License, or
  8. * (at your option) any later version.
  9. *
  10. * This library is distributed in the hope that it will be useful,
  11. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13. * GNU Lesser General Public License for more details.
  14. *
  15. * You should have received a copy of the GNU Lesser General Public License
  16. * along with this program; if not, write to the Free Software
  17. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18. */
  19. package gnu.regexp;
  20. import java.io.Serializable;
  21. abstract class REToken implements Serializable {
  22. protected REToken next = null;
  23. protected REToken uncle = null;
  24. protected int subIndex;
  25. protected REToken(int subIndex) {
  26. this.subIndex = subIndex;
  27. }
  28. int getMinimumLength() {
  29. return 0;
  30. }
  31. void setUncle(REToken anUncle) {
  32. uncle = anUncle;
  33. }
  34. /** Returns true if the match succeeded, false if it failed. */
  35. abstract boolean match(CharIndexed input, REMatch mymatch);
  36. /** Returns true if the rest of the tokens match, false if they fail. */
  37. protected boolean next(CharIndexed input, REMatch mymatch) {
  38. if (next == null) {
  39. if (uncle == null) {
  40. return true;
  41. } else {
  42. return uncle.match(input, mymatch);
  43. }
  44. } else {
  45. return next.match(input, mymatch);
  46. }
  47. }
  48. boolean chain(REToken token) {
  49. next = token;
  50. return true; // Token was accepted
  51. }
  52. abstract void dump(StringBuffer os);
  53. void dumpAll(StringBuffer os) {
  54. dump(os);
  55. if (next != null) next.dumpAll(os);
  56. }
  57. }