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annotate core/src/luan/impl/EqExpr.java @ 191:2456ef7ada02

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minor git-svn-id: https://luan-java.googlecode.com/svn/trunk@192 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 01 Jul 2014 06:40:48 +0000
parents 3dcb0f9bee82
children 17b02b56d806
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1 package luan.impl;
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3 import luan.Luan;
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4 import luan.LuanFunction;
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5 import luan.LuanTable;
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6 import luan.LuanException;
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7 import luan.LuanSource;
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8 import luan.LuanBit;
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11 final class EqExpr extends BinaryOpExpr {
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13 EqExpr(LuanSource.Element se,Expr op1,Expr op2) {
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14 super(se,op1,op2);
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15 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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18 return eq(luan);
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19 }
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21 private boolean eq(LuanStateImpl luan) throws LuanException {
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22 Object o1 = op1.eval(luan);
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23 Object o2 = op2.eval(luan);
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24 if( o1 == o2 || o1 != null && o1.equals(o2) )
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25 return true;
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26 if( o1 instanceof Number && o2 instanceof Number ) {
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27 Number n1 = (Number)o1;
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28 Number n2 = (Number)o2;
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29 return n1.doubleValue() == n2.doubleValue();
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30 }
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31 if( o1==null || o2==null || !o1.getClass().equals(o2.getClass()) )
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32 return false;
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33 LuanTable mt1 = luan.getMetatable(o1);
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34 LuanTable mt2 = luan.getMetatable(o2);
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35 if( mt1==null || mt2==null )
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36 return false;
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37 Object f = mt1.get("__eq");
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38 if( f == null || !f.equals(mt2.get("__eq")) )
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39 return false;
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40 LuanBit bit = luan.bit(se);
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41 LuanFunction fn = bit.checkFunction(f);
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42 return Luan.toBoolean( Luan.first(bit.call(fn,"__eq",new Object[]{o1,o2})) );
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43 }
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45 @Override public String toString() {
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46 return "(EqExpr "+op1+" "+op2+")";
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47 }
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48 }