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annotate core/src/luan/impl/UnmExpr.java @ 404:d55e873e1f0d

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metatables now only apply to tables
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 29 Apr 2015 07:04:40 -0600
parents 3dcb0f9bee82
children bbad2d06f728
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4eaee12f6c65 move luan/interp to impl
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 112
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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>
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.LuanFunction;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 46
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5 import luan.LuanException;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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6 import luan.LuanSource;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 49
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7 import luan.LuanBit;
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d55e873e1f0d metatables now only apply to tables
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parents: 171
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8 import luan.LuanTable;
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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>
parents:
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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11 // unary minus
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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12 final class UnmExpr extends UnaryOpExpr {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 46
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14 UnmExpr(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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15 super(se,op);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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16 }
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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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18 @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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19 Object o = op.eval(luan);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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20 Number n = Luan.toNumber(o);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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21 if( n != null )
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 44
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22 return -n.doubleValue();
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 49
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23 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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24 if( o instanceof LuanTable ) {
d55e873e1f0d metatables now only apply to tables
Franklin Schmidt <fschmidt@gmail.com>
parents: 171
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25 LuanFunction fn = bit.getHandlerFunction("__unm",(LuanTable)o);
d55e873e1f0d metatables now only apply to tables
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parents: 171
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26 if( fn != null ) {
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27 return Luan.first(bit.call(fn,"__unm",new Object[]{o}));
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parents: 171
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28 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 37
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29 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 49
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30 throw bit.exception("attempt to perform arithmetic on a "+Luan.type(o)+" value");
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31 }
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32 }