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comparison src/luan/interp/LtExpr.java @ 8:8896068e0a4b

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finish operators git-svn-id: https://luan-java.googlecode.com/svn/trunk@9 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 21 Nov 2012 06:57:09 +0000
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children b7d7069fee58
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7:bca8fc5d928b 8:8896068e0a4b
1 package luan.interp;
2
3 import luan.Lua;
4 import luan.LuaNumber;
5 import luan.LuaException;
6 import luan.LuaState;
7
8
9 final class LtExpr extends BinaryOpExpr {
10
11 LtExpr(Expr op1,Expr op2) {
12 super(op1,op2);
13 }
14
15 @Override Object eval(LuaState lua) throws LuaException {
16 Object v1 = op1.eval(lua);
17 Object v2 = op2.eval(lua);
18 if( v1 instanceof LuaNumber && v2 instanceof LuaNumber ) {
19 LuaNumber n1 = (LuaNumber)v1;
20 LuaNumber n2 = (LuaNumber)v2;
21 return n1.compareTo(n2) < 0;
22 }
23 if( v1 instanceof String && v2 instanceof String ) {
24 String s1 = (String)v1;
25 String s2 = (String)v2;
26 return s1.compareTo(s2) < 0;
27 }
28 throw new LuaException( "attempt to compare " + Lua.type(v1) + " with " + Lua.type(v2) );
29 }
30 }