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annotate core/src/luan/impl/UnmExpr.java @ 647:8e8c30b72e9b

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move methods from LuanState to Luan
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 29 Mar 2016 20:39:14 -0600
parents cdc70de628b5
children
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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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3 import luan.Luan;
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4 import luan.LuanFunction;
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5 import luan.LuanException;
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6 import luan.LuanTable;
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9 // unary minus
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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10 final class UnmExpr extends UnaryOpExpr {
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12 UnmExpr(Expr op) {
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13 super(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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parents: 48
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17 Object o = op.eval(luan);
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18 if( o instanceof Number )
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19 return -((Number)o).doubleValue();
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20 if( o instanceof LuanTable ) {
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21 LuanFunction fn = Luan.getHandlerFunction("__unm",(LuanTable)o);
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22 if( fn != null ) {
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23 return Luan.first(fn.call(luan,new Object[]{o}));
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24 }
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25 }
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26 throw new LuanException("attempt to perform arithmetic on a "+Luan.type(o)+" value");
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27 }
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28 }