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annotate src/luan/interp/IndexExpr.java @ 37:8a57ebfdfd78
add JavaLib
git-svn-id: https://luan-java.googlecode.com/svn/trunk@38 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Thu, 20 Dec 2012 02:36:07 +0000 |
parents | 2a35154aec14 |
children | e3624b7cd603 |
rev | line source |
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35
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1 package luan.interp; |
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2 |
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3 import luan.Lua; |
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4 import luan.LuaException; |
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5 import luan.LuaTable; |
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6 import luan.LuaFunction; |
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7 |
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8 |
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9 final class IndexExpr extends BinaryOpExpr { |
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10 |
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11 IndexExpr(Expr op1,Expr op2) { |
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12 super(op1,op2); |
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13 } |
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14 |
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15 @Override public Object eval(LuaStateImpl lua) throws LuaException { |
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16 return index(lua,op1.eval(lua),op2.eval(lua)); |
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17 } |
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18 |
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19 private static Object index(LuaStateImpl lua,Object t,Object key) throws LuaException { |
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20 Object h; |
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21 if( t instanceof LuaTable ) { |
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22 LuaTable tbl = (LuaTable)t; |
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23 Object value = tbl.get(key); |
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24 if( value != null ) |
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25 return value; |
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26 h = lua.getHandler("__index",t); |
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27 if( h==null ) |
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28 return null; |
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29 } else { |
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8a57ebfdfd78
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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30 h = lua.getHandler("__index",t); |
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31 if( h==null ) |
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32 throw new LuaException( "attempt to index a " + Lua.type(t) + " value" ); |
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33 } |
e51906de0f11
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34 if( h instanceof LuaFunction ) { |
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35 LuaFunction fn = (LuaFunction)h; |
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36 return Utils.first(fn.call(lua,t,key)); |
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37 } |
e51906de0f11
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38 return index(lua,h,key); |
e51906de0f11
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39 } |
e51906de0f11
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40 } |