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annotate core/src/luan/impl/LenExpr.java @ 572:f1601a4ce1aa

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fix stack when calling meta-methods
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 12 Jul 2015 21:34:23 -0600
parents b48cfa14ba60
children 7c3ad6db8ac3
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4eaee12f6c65 move luan/interp to impl
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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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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3 import luan.Luan;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 46
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4 import luan.LuanTable;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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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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8 import luan.LuanBit;
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bca8fc5d928b work on expressions
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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11 final class LenExpr extends UnaryOpExpr {
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13 LenExpr(LuanElement el,Expr op) {
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14 super(el,op);
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15 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 48
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18 Object o = op.eval(luan);
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e51906de0f11 implement metatables
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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19 if( o instanceof String ) {
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20 String s = (String)o;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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21 return s.length();
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22 }
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23 if( o instanceof byte[] ) {
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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24 byte[] a = (byte[])o;
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25 return a.length;
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26 }
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27 LuanBit bit = luan.bit(el);
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28 if( !(o instanceof LuanTable) )
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29 throw bit.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(bit);
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32 }
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33 }