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annotate src/luan/interp/ConcatExpr.java @ 37:8a57ebfdfd78

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add JavaLib git-svn-id: https://luan-java.googlecode.com/svn/trunk@38 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 20 Dec 2012 02:36:07 +0000
parents e51906de0f11
children e3624b7cd603
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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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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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3 import luan.Lua;
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4 import luan.LuaFunction;
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5 import luan.LuaException;
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8 final class ConcatExpr extends BinaryOpExpr {
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10 ConcatExpr(Expr op1,Expr op2) {
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11 super(op1,op2);
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12 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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14 @Override public Object eval(LuaStateImpl lua) throws LuaException {
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15 Object o1 = op1.eval(lua);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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16 Object o2 = op2.eval(lua);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 String s1 = Lua.asString(o1);
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18 String s2 = Lua.asString(o2);
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19 if( s1 != null && s2 != null )
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20 return s1 + s2;
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21 LuaFunction fn = lua.getBinHandler("__concat",o1,o2);
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22 if( fn != null )
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23 return Utils.first(fn.call(lua,o1,o2));
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24 String type = s1==null ? Lua.type(o1) : Lua.type(o2);
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25 throw new LuaException( "attempt to concatenate a " + type + " value" );
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26 }
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27 }