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annotate core/src/luan/impl/LenExpr.java @ 576:4723d22062ce

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remove LuanBit
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 13 Jul 2015 20:38:26 -0600
parents 7c3ad6db8ac3
children 60c549d43988
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 114
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1 package luan.impl;
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3 import luan.Luan;
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4 import luan.LuanTable;
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5 import luan.LuanFunction;
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6 import luan.LuanException;
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7 import luan.LuanElement;
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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(LuanElement el,Expr op) {
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13 super(el,op);
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14 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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16 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 Object o = op.eval(luan);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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18 if( o instanceof String ) {
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19 String s = (String)o;
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20 return s.length();
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21 }
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22 if( o instanceof byte[] ) {
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23 byte[] a = (byte[])o;
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24 return a.length;
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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25 }
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26 luan.push(el,null);
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27 try {
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28 if( !(o instanceof LuanTable) )
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29 throw luan.exception( "attempt to get length of a " + Luan.type(o) + " value" );
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30 LuanTable t = (LuanTable)o;
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31 return t.length(luan);
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32 } finally {
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33 luan.pop();
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34 }
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35 }
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36 }