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annotate src/luan/interp/LtExpr.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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3 import luan.Lua;
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4 import luan.LuaNumber;
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5 import luan.LuaFunction;
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6 import luan.LuaException;
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9 final class LtExpr extends BinaryOpExpr {
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11 LtExpr(Expr op1,Expr op2) {
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12 super(op1,op2);
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13 }
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15 @Override public Object eval(LuaStateImpl lua) throws LuaException {
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16 Object o1 = op1.eval(lua);
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17 Object o2 = op2.eval(lua);
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18 if( o1 instanceof LuaNumber && o2 instanceof LuaNumber ) {
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19 LuaNumber n1 = (LuaNumber)o1;
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20 LuaNumber n2 = (LuaNumber)o2;
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21 return n1.compareTo(n2) < 0;
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22 }
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23 if( o1 instanceof String && o2 instanceof String ) {
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24 String s1 = (String)o1;
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25 String s2 = (String)o2;
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26 return s1.compareTo(s2) < 0;
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27 }
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28 LuaFunction fn = lua.getBinHandler("__lt",o1,o2);
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29 if( fn != null )
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30 return Lua.toBoolean( Utils.first(fn.call(lua,o1,o2)) );
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31 throw new LuaException( "attempt to compare " + Lua.type(o1) + " with " + Lua.type(o2) );
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32 }
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33 }