/interpreter/tags/at2dist110511/src/edu/vub/at/objects/natives/grammar/AGMultiDefinition.java

http://ambienttalk.googlecode.com/ · Java · 133 lines · 64 code · 16 blank · 53 comment · 6 complexity · f0e63357d0ccddc92b511d15fc3b3525 MD5 · raw file

  1. /**
  2. * AmbientTalk/2 Project
  3. * AGMultiDefinition.java created on 18-aug-2006 at 10:13:58
  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.eval.Evaluator;
  30. import edu.vub.at.eval.PartialBinder;
  31. import edu.vub.at.exceptions.InterpreterException;
  32. import edu.vub.at.objects.ATContext;
  33. import edu.vub.at.objects.ATObject;
  34. import edu.vub.at.objects.ATTable;
  35. import edu.vub.at.objects.grammar.ATDefinition;
  36. import edu.vub.at.objects.grammar.ATExpression;
  37. import edu.vub.at.objects.grammar.ATMultiDefinition;
  38. import edu.vub.at.objects.natives.NATText;
  39. import edu.vub.util.TempFieldGenerator;
  40. import java.util.HashSet;
  41. import java.util.Set;
  42. /**
  43. * @author tvc
  44. *
  45. * The native implementation of a multiple definition AG element.
  46. */
  47. public class AGMultiDefinition extends AGDefinition implements ATMultiDefinition {
  48. private final ATTable parameters_;
  49. private final ATExpression valueExp_;
  50. private final PartialBinder binderPartialFunction_;
  51. public AGMultiDefinition(ATTable par, ATExpression val) throws InterpreterException {
  52. parameters_ = par;
  53. valueExp_ = val;
  54. binderPartialFunction_ = PartialBinder.calculateResidual("multi-definition", par);
  55. }
  56. public ATTable base_parameters() { return parameters_; }
  57. public ATExpression base_valueExpression() { return valueExp_; }
  58. /**
  59. * To evaluate a multiple definition, evaluate the right hand side to a table
  60. * and bind the parameters on the left hand side to the 'arguments' of the right hand side,
  61. * exactly as if they were bound during a function call.
  62. *
  63. * AGMULTIDEF(par,val).eval(ctx) = bind(ctx.scope, par, val.eval(ctx))
  64. *
  65. * @return the evaluated arguments table
  66. */
  67. public ATObject meta_eval(ATContext ctx) throws InterpreterException {
  68. ATTable args = valueExp_.meta_eval(ctx).asTable();
  69. PartialBinder.defineParamsForArgs(binderPartialFunction_, ctx, args);
  70. return args;
  71. }
  72. /**
  73. * AGMULTIDEF(par,val).quote(ctx) = AGMULTIDEF(par.quote(ctx), val.quote(ctx))
  74. */
  75. public ATObject meta_quote(ATContext ctx) throws InterpreterException {
  76. return new AGMultiDefinition(parameters_.meta_quote(ctx).asTable(), valueExp_.meta_quote(ctx).asExpression());
  77. }
  78. public NATText meta_print() throws InterpreterException {
  79. return NATText.atValue("def " + parameters_.meta_print().javaValue + " := " + valueExp_.meta_print().javaValue);
  80. }
  81. public NATText impl_asUnquotedCode(TempFieldGenerator objectMap) throws InterpreterException {
  82. return NATText.atValue("def " + parameters_.impl_asUnquotedCode(objectMap).javaValue + " := " + valueExp_.impl_asUnquotedCode(objectMap).javaValue);
  83. }
  84. /**
  85. * IV(def [v1, v2 := exp, @ rest] := exp) = { v1, v2, rest }
  86. */
  87. public Set impl_introducedVariables() throws InterpreterException {
  88. Set introducedVariables = new HashSet();
  89. ATObject[] params = parameters_.asNativeTable().elements_;
  90. for (int i = 0; i < params.length; i++) {
  91. if (params[i].isSymbol()) {
  92. // Mandatory arguments, e.g. x
  93. introducedVariables.add(params[i].asSymbol());
  94. } else if (params[i].isVariableAssignment()) {
  95. // Optional arguments, e.g. x := 5
  96. introducedVariables.add(params[i].asVariableAssignment().base_name());
  97. } else if (params[i].isSplice()) {
  98. // Rest arguments, e.g. @x
  99. introducedVariables.add(params[i].asSplice().base_expression().asSymbol());
  100. }
  101. }
  102. return introducedVariables;
  103. }
  104. /**
  105. * FV(def [v1, v2 := exp1, @ rest] := exp2) = FV(exp1) U (FV(exp2) \ { f1,f2 })
  106. */
  107. public Set impl_freeVariables() throws InterpreterException {
  108. Set fvValueExp = valueExp_.impl_freeVariables();
  109. Evaluator.processFreeVariables(fvValueExp, parameters_);
  110. return fvValueExp;
  111. }
  112. public Set impl_quotedFreeVariables() throws InterpreterException {
  113. Set qfv = parameters_.impl_quotedFreeVariables();
  114. qfv.addAll(valueExp_.impl_quotedFreeVariables());
  115. return qfv;
  116. }
  117. }