/interpreter/tags/at2dist130208/src/edu/vub/at/objects/natives/grammar/NATAbstractGrammar.java

http://ambienttalk.googlecode.com/ · Java · 56 lines · 12 code · 6 blank · 38 comment · 0 complexity · 3ff4a084d2a2f47adee8b534c37d8069 MD5 · raw file

  1. /**
  2. * AmbientTalk/2 Project
  3. * NATAbstractGrammar.java created on 26-jul-2006 at 11:57:00
  4. * (c) Programming Technology Lab, 2006 - 2007
  5. * Authors: Tom Van Cutsem & Stijn Mostinckx
  6. *
  7. * Permission is hereby granted, free of charge, to any person
  8. * obtaining a copy of this software and associated documentation
  9. * files (the "Software"), to deal in the Software without
  10. * restriction, including without limitation the rights to use,
  11. * copy, modify, merge, publish, distribute, sublicense, and/or
  12. * sell copies of the Software, and to permit persons to whom the
  13. * Software is furnished to do so, subject to the following
  14. * conditions:
  15. *
  16. * The above copyright notice and this permission notice shall be
  17. * included in all copies or substantial portions of the Software.
  18. *
  19. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20. * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  21. * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22. * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  23. * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  24. * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  25. * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  26. * OTHER DEALINGS IN THE SOFTWARE.
  27. */
  28. package edu.vub.at.objects.natives.grammar;
  29. import edu.vub.at.exceptions.InterpreterException;
  30. import edu.vub.at.objects.ATAbstractGrammar;
  31. import edu.vub.at.objects.ATTable;
  32. import edu.vub.at.objects.coercion.NativeTypeTags;
  33. import edu.vub.at.objects.natives.NATByCopy;
  34. import edu.vub.at.objects.natives.NATTable;
  35. /**
  36. * @author tvc
  37. *
  38. * NATAbstractGrammar is the common superclass of all native ambienttalk objects
  39. * that represent abstract grammar parse tree elements. That is, any object that
  40. * can be returned as part of the AST produced by the native parser.
  41. */
  42. public abstract class NATAbstractGrammar extends NATByCopy implements ATAbstractGrammar {
  43. // This is an empty superclass used only for proper documentation and
  44. // to identify which native objects can be output by the parser.
  45. // subclasses of NATAbstractGrammar will override meta_eval and meta_quote as appropriate,
  46. // except for the literal grammar elements which can inherit the self-evaluating behaviour of NATNil.
  47. public ATTable meta_typeTags() throws InterpreterException {
  48. return NATTable.of(NativeTypeTags._ABSTRACTGRAMMAR_, NativeTypeTags._ISOLATE_);
  49. }
  50. }