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annotate src/luan/interp/LtExpr.java @ 31:5cf15507d77e

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separate interpreter from interface git-svn-id: https://luan-java.googlecode.com/svn/trunk@32 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 13 Dec 2012 02:50:04 +0000
parents b7d7069fee58
children e51906de0f11
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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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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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4 import luan.LuaNumber;
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5 import luan.LuaException;
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8 final class LtExpr extends BinaryOpExpr {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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10 LtExpr(Expr op1,Expr op2) {
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11 super(op1,op2);
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12 }
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14 @Override public Object eval(LuaStateImpl lua) throws LuaException {
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15 Object v1 = op1.eval(lua);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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16 Object v2 = op2.eval(lua);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 if( v1 instanceof LuaNumber && v2 instanceof LuaNumber ) {
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18 LuaNumber n1 = (LuaNumber)v1;
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19 LuaNumber n2 = (LuaNumber)v2;
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20 return n1.compareTo(n2) < 0;
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21 }
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22 if( v1 instanceof String && v2 instanceof String ) {
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23 String s1 = (String)v1;
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24 String s2 = (String)v2;
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25 return s1.compareTo(s2) < 0;
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26 }
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27 throw new LuaException( "attempt to compare " + Lua.type(v1) + " with " + Lua.type(v2) );
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28 }
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29 }