Examples of kiss.lang.Expression.eval()

kiss.lang.Expression.eval()
Evaluate an expression within an environment, interpreter style. Any changes to the Environment are discarded. @param e Any Environment in which to evaluate the expression @return The result of the expression.

  @Override
  public Expression optimise() {
    Expression b=body.optimise();
    Type bt=body.getType();
    if (b.isConstant()) {
      Object val=b.eval();
      if (type.checkInstance(val)) throw new KissException("Impossible to cast value "+val+" to type: "+type);
      // TODO: is this logic sound? what about interface casts?
      return b;
    } 
    Type t=type;

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  public static Object eval(String s) {
    Object form=read(s);
    Expression ex=kiss.lang.Compiler.compile(Environment.EMPTY,form);
    return ex.eval();
  }
  
  public static IPersistentVector expectVector(Object x) {
    if (x instanceof IPersistentVector) {
      return (IPersistentVector)x;

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  }
  
  private void checkConstant(Object expected,Expression x) {
    Expression opt=x.optimise();
    assertTrue("Expression not constant: "+x,opt.isConstant());
    assertEquals(expected,opt.eval());
  }


  @Test
  public void testIf() {
    assertEquals(2,If.create(Constant.create(null), Constant.create(1), Constant.create(2)).eval());

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  public void testIf() {
    assertEquals(2,If.create(Constant.create(null), Constant.create(1), Constant.create(2)).eval());
    
    ISeq s=KissUtils.createSeq(Symbol.intern("if"),Symbol.intern("nil"),1,2);
    Expression x=Analyser.analyse(s);
    assertEquals(2,x.eval());


  }
}

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