Mercurial Hosting > luan
annotate core/src/luan/impl/IndexExpr.java @ 404:d55e873e1f0d
metatables now only apply to tables
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Wed, 29 Apr 2015 07:04:40 -0600 |
parents | 3dcb0f9bee82 |
children | 3e68917a0dc6 |
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1 package luan.impl; |
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2 |
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3 import luan.Luan; |
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4 import luan.LuanException; |
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5 import luan.LuanTable; |
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6 import luan.LuanFunction; |
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7 import luan.LuanSource; |
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8 import luan.modules.StringLuan; |
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9 import luan.modules.BinaryLuan; |
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10 import luan.modules.JavaLuan; |
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11 |
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12 |
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13 final class IndexExpr extends BinaryOpExpr { |
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14 |
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15 IndexExpr(LuanSource.Element se,Expr op1,Expr op2) { |
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16 super(se,op1,op2); |
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17 } |
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18 |
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19 @Override public Object eval(LuanStateImpl luan) throws LuanException { |
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20 return index(luan,op1.eval(luan),op2.eval(luan)); |
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21 } |
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22 |
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23 private Object index(LuanStateImpl luan,Object obj,Object key) throws LuanException { |
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24 if( obj instanceof LuanTable ) { |
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25 LuanTable tbl = (LuanTable)obj; |
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26 Object value = tbl.get(key); |
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27 if( value != null ) |
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28 return value; |
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29 Object h = luan.getHandler("__index",tbl); |
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30 if( h==null ) |
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31 return null; |
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32 if( h instanceof LuanFunction ) { |
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33 LuanFunction fn = (LuanFunction)h; |
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34 return Luan.first(luan.bit(se).call(fn,"__index",new Object[]{tbl,key})); |
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35 } |
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36 return index(luan,h,key); |
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37 } |
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38 if( obj instanceof String ) |
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39 return StringLuan.__index(luan,(String)obj,key); |
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40 if( obj instanceof byte[] ) |
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41 return BinaryLuan.__index(luan,(byte[])obj,key); |
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42 Object value = JavaLuan.__index(luan,obj,key); |
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43 if( value != null ) |
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44 return value; |
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45 throw luan.bit(op1.se()).exception( "attempt to index '"+op1.se().text()+"' (a " + Luan.type(obj) + " value)" ); |
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46 } |
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47 } |