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annotate core/src/luan/impl/LenExpr.java @ 432:d9df6d6cb927

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finish fixing LuanTable to use metatables
author Franklin Schmidt <fschmidt@gmail.com>
date Sat, 02 May 2015 23:41:59 -0600
parents d55e873e1f0d
children b48cfa14ba60
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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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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 46
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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>
parents: 46
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5 import luan.LuanFunction;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 46
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6 import luan.LuanException;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 46
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7 import luan.LuanSource;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 49
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8 import luan.LuanBit;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 3
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11 final class LenExpr extends UnaryOpExpr {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 46
diff changeset
13 LenExpr(LuanSource.Element se,Expr op) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 37
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14 super(se,op);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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15 }
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parents:
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 48
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17 @Override public Object eval(LuanStateImpl luan) throws LuanException {
8ede219cd111 add WebShell
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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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 31
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19 if( o instanceof String ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 31
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20 String s = (String)o;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 44
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21 return s.length();
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22 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 112
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23 if( o instanceof byte[] ) {
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 112
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24 byte[] a = (byte[])o;
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parents: 112
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25 return a.length;
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 112
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26 }
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6ca02b188dba add LuanBit to clean up code;
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 49
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27 LuanBit bit = luan.bit(se);
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d55e873e1f0d metatables now only apply to tables
Franklin Schmidt <fschmidt@gmail.com>
parents: 171
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28 if( !(o instanceof LuanTable) )
d55e873e1f0d metatables now only apply to tables
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parents: 171
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29 throw bit.exception( "attempt to get length of a " + Luan.type(o) + " value" );
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parents: 171
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30 LuanTable t = (LuanTable)o;
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d9df6d6cb927 finish fixing LuanTable to use metatables
Franklin Schmidt <fschmidt@gmail.com>
parents: 404
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31 return t.length(luan);
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parents:
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32 }
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33 }