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annotate src/luan/interp/BinaryOpExpr.java @ 35:e51906de0f11

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implement metatables git-svn-id: https://luan-java.googlecode.com/svn/trunk@36 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 18 Dec 2012 07:05:58 +0000
parents b7d7069fee58
children 2a35154aec14
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan.interp;
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3 import luan.Lua;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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4 import luan.LuaTable;
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5 import luan.LuaFunction;
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parents: 11
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6 import luan.LuaException;
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parents: 11
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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9 abstract class BinaryOpExpr implements Expr {
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10 final Expr op1;
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11 final Expr op2;
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13 BinaryOpExpr(Expr op1,Expr op2) {
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14 this.op1 = op1;
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15 this.op2 = op2;
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16 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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18 static final LuaFunction getBinHandler(String op,Object o1,Object o2) throws LuaException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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19 LuaFunction f1 = Utils.getHandler(op,o1);
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20 if( f1 != null )
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21 return f1;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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22 return Utils.getHandler(op,o2);
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23 }
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25 static final Object arithmetic(LuaStateImpl lua,String op,Object o1,Object o2) throws LuaException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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26 LuaFunction fn = getBinHandler(op,o1,o2);
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27 if( fn != null )
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28 return Utils.first(fn.call(lua,o1,o2));
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29 String type = Lua.toNumber(o1)==null ? Lua.type(o1) : Lua.type(o2);
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30 throw new LuaException("attempt to perform arithmetic on a "+type+" value");
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31 }
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32 }