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/jEdit/tags/jedit-4-2-pre4/bsh/BSHIfStatement.java

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Java | 78 lines | 38 code | 8 blank | 32 comment | 8 complexity | 013b8dc6be13e46542fd36e96d61cf4e 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. * *
  3. * This file is part of the BeanShell Java Scripting distribution. *
  4. * Documentation and updates may be found at http://www.beanshell.org/ *
  5. * *
  6. * Sun Public License Notice: *
  7. * *
  8. * The contents of this file are subject to the Sun Public License Version *
  9. * 1.0 (the "License"); you may not use this file except in compliance with *
  10. * the License. A copy of the License is available at http://www.sun.com *
  11. * *
  12. * The Original Code is BeanShell. The Initial Developer of the Original *
  13. * Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
  14. * (C) 2000. All Rights Reserved. *
  15. * *
  16. * GNU Public License Notice: *
  17. * *
  18. * Alternatively, the contents of this file may be used under the terms of *
  19. * the GNU Lesser General Public License (the "LGPL"), in which case the *
  20. * provisions of LGPL are applicable instead of those above. If you wish to *
  21. * allow use of your version of this file only under the terms of the LGPL *
  22. * and not to allow others to use your version of this file under the SPL, *
  23. * indicate your decision by deleting the provisions above and replace *
  24. * them with the notice and other provisions required by the LGPL. If you *
  25. * do not delete the provisions above, a recipient may use your version of *
  26. * this file under either the SPL or the LGPL. *
  27. * *
  28. * Patrick Niemeyer (pat@pat.net) *
  29. * Author of Learning Java, O'Reilly & Associates *
  30. * http://www.pat.net/~pat/ *
  31. * *
  32. *****************************************************************************/
  33. package bsh;
  34. class BSHIfStatement extends SimpleNode
  35. {
  36. BSHIfStatement(int id) { super(id); }
  37. public Object eval(CallStack callstack, Interpreter interpreter)
  38. throws EvalError
  39. {
  40. Object ret = null;
  41. if( evaluateCondition(
  42. (SimpleNode)jjtGetChild(0), callstack, interpreter ) )
  43. ret = ((SimpleNode)jjtGetChild(1)).eval(callstack, interpreter);
  44. else
  45. if(jjtGetNumChildren() > 2)
  46. ret = ((SimpleNode)jjtGetChild(2)).eval(callstack, interpreter);
  47. if(ret instanceof ReturnControl)
  48. return ret;
  49. else
  50. return Primitive.VOID;
  51. }
  52. public static boolean evaluateCondition(
  53. SimpleNode condExp, CallStack callstack, Interpreter interpreter)
  54. throws EvalError
  55. {
  56. Object obj = condExp.eval(callstack, interpreter);
  57. if(obj instanceof Primitive) {
  58. if ( obj == Primitive.VOID )
  59. throw new EvalError("Condition evaluates to void type",
  60. condExp, callstack );
  61. obj = ((Primitive)obj).getValue();
  62. }
  63. if(obj instanceof Boolean)
  64. return ((Boolean)obj).booleanValue();
  65. else
  66. throw new EvalError(
  67. "Condition must evaluate to a Boolean or boolean.",
  68. condExp, callstack );
  69. }
  70. }