/interpreter/tags/at_build150307/src/edu/vub/at/objects/natives/grammar/AGSplice.java

http://ambienttalk.googlecode.com/ · Java · 81 lines · 29 code · 11 blank · 41 comment · 0 complexity · 3da758e7d6d70ce69b2a987f7efaa3b2 MD5 · raw file

  1. /**
  2. * AmbientTalk/2 Project
  3. * AGSplice.java created on 1-aug-2006 at 21:12:15
  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.exceptions.XIllegalSplice;
  31. import edu.vub.at.exceptions.XTypeMismatch;
  32. import edu.vub.at.objects.ATContext;
  33. import edu.vub.at.objects.ATObject;
  34. import edu.vub.at.objects.grammar.ATExpression;
  35. import edu.vub.at.objects.grammar.ATSplice;
  36. import edu.vub.at.objects.natives.NATText;
  37. /**
  38. * @author tvc
  39. *
  40. * The native implementation of an AGSplice AG element.
  41. */
  42. public class AGSplice extends AGExpression implements ATSplice {
  43. private final ATExpression splExp_;
  44. public AGSplice(ATExpression exp) {
  45. splExp_ = exp;
  46. }
  47. public ATExpression base_getExpression() { return splExp_; }
  48. /**
  49. * A spliced element cannot be evaluated, but rather gives rise to an XIllegalSplice exception.
  50. * This is because a splice should always be nested within either a formal parameter list or a table.
  51. *
  52. * AGSPL(exp).eval(ctx) = ERROR
  53. */
  54. public ATObject meta_eval(ATContext ctx) throws InterpreterException {
  55. throw new XIllegalSplice(splExp_);
  56. }
  57. /**
  58. * Quoting a splice means quoting its contained expression, and returning a new splice.
  59. */
  60. public ATObject meta_quote(ATContext ctx) throws InterpreterException {
  61. return new AGSplice(splExp_.meta_quote(ctx).asExpression());
  62. }
  63. public NATText meta_print() throws InterpreterException {
  64. return NATText.atValue("@"+ splExp_.meta_print().javaValue);
  65. }
  66. public boolean isSplice() { return true; }
  67. public ATSplice asSplice() throws XTypeMismatch {
  68. return this;
  69. }
  70. }