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annotate core/src/luan/impl/EqExpr.java @ 647:8e8c30b72e9b

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move methods from LuanState to Luan
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 29 Mar 2016 20:39:14 -0600
parents 859c0dedc8b6
children
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan.impl;
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3 import java.util.Arrays;
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4 import luan.Luan;
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5 import luan.LuanFunction;
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6 import luan.LuanTable;
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7 import luan.LuanException;
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10 final class EqExpr extends BinaryOpExpr {
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12 EqExpr(Expr op1,Expr op2) {
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13 super(op1,op2);
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14 }
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16 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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17 return eq(luan);
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18 }
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20 private boolean eq(LuanStateImpl luan) throws LuanException {
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21 Object o1 = op1.eval(luan);
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22 Object o2 = op2.eval(luan);
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23 if( o1 == o2 || o1 != null && o1.equals(o2) )
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24 return true;
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25 if( o1 instanceof Number && o2 instanceof Number ) {
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26 Number n1 = (Number)o1;
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27 Number n2 = (Number)o2;
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28 return n1.doubleValue() == n2.doubleValue();
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29 }
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30 if( o1 instanceof byte[] && o2 instanceof byte[] ) {
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31 byte[] b1 = (byte[])o1;
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32 byte[] b2 = (byte[])o2;
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33 return Arrays.equals(b1,b2);
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34 }
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35 if( !(o1 instanceof LuanTable && o2 instanceof LuanTable) )
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36 return false;
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37 LuanTable t1 = (LuanTable)o1;
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38 LuanTable t2 = (LuanTable)o2;
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39 LuanTable mt1 = t1.getMetatable();
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40 LuanTable mt2 = t2.getMetatable();
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41 if( mt1==null || mt2==null )
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42 return false;
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43 Object f = mt1.rawGet("__eq");
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44 if( f == null || !f.equals(mt2.rawGet("__eq")) )
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45 return false;
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46 LuanFunction fn = Luan.checkFunction(f);
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47 return Luan.checkBoolean( Luan.first(fn.call(luan,new Object[]{o1,o2})) );
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48 }
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50 @Override public String toString() {
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51 return "(EqExpr "+op1+" "+op2+")";
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52 }
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53 }