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annotate src/luan/interp/LenExpr.java @ 7:bca8fc5d928b

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work on expressions git-svn-id: https://luan-java.googlecode.com/svn/trunk@8 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 20 Nov 2012 10:06:27 +0000
parents src/luan/interp/LengthExpr.java@7a2cdbc5767f
children b7d7069fee58
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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.LuaTable;
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6 import luan.LuaException;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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7 import luan.LuaState;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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10 final class LenExpr extends UnaryOpExpr {
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12 LenExpr(Expr op) {
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13 super(op);
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14 }
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16 @Override Object eval(LuaState lua) throws LuaException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 return new LuaNumber( length(op.eval(lua)) );
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18 }
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20 private static int length(Object obj) throws LuaException {
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21 if( obj instanceof String ) {
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22 String s = (String)obj;
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23 return s.length();
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24 }
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25 if( obj instanceof LuaTable ) {
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26 LuaTable t = (LuaTable)obj;
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27 return t.length();
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28 }
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29 throw new LuaException( "attempt to get length of a " + Lua.type(obj) + " value" );
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30 }
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31 }