Mercurial Hosting > luan
annotate core/src/luan/impl/IndexExpr.java @ 421:b31d614343e8
add Io.LuanString.text_writer();
improve java related errors;
fix to_string;
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 01 May 2015 15:13:14 -0600 |
parents | 8fbb961aabd5 |
children | 23a93c118042 |
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move luan/interp to impl
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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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; |
405 | 8 import luan.LuanMeta; |
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9 import luan.modules.StringLuan; |
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10 import luan.modules.BinaryLuan; |
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11 import luan.modules.JavaLuan; |
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12 |
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13 |
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14 final class IndexExpr extends BinaryOpExpr { |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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15 |
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16 IndexExpr(LuanSource.Element se,Expr op1,Expr op2) { |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 super(se,op1,op2); |
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18 } |
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19 |
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20 @Override public Object eval(LuanStateImpl luan) throws LuanException { |
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21 return index(luan,op1.eval(luan),op2.eval(luan)); |
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22 } |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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23 |
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24 private Object index(LuanStateImpl luan,Object obj,Object key) throws LuanException { |
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25 if( obj instanceof LuanTable ) { |
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26 LuanTable tbl = (LuanTable)obj; |
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27 Object value = tbl.get(key); |
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28 if( value != null ) |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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29 return value; |
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30 Object h = tbl.getHandler("__index"); |
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31 if( h==null ) |
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32 return null; |
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33 if( h instanceof LuanFunction ) { |
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34 LuanFunction fn = (LuanFunction)h; |
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35 return Luan.first(luan.bit(se).call(fn,"__index",new Object[]{tbl,key})); |
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36 } |
405 | 37 if( h instanceof LuanMeta ) { |
38 LuanMeta meta = (LuanMeta)h; | |
39 return meta.__index(luan,tbl,key); | |
40 } | |
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41 return index(luan,h,key); |
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42 } |
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43 if( obj instanceof String ) |
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44 return StringLuan.__index(luan,(String)obj,key); |
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45 if( obj instanceof byte[] ) |
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46 return BinaryLuan.__index(luan,(byte[])obj,key); |
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47 if( obj != null && luan.currentEnvironment().hasJava() ) |
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48 return JavaLuan.__index(luan,obj,key); |
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49 else |
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50 throw luan.bit(op1.se()).exception( "attempt to index '"+op1.se().text()+"' (a " + Luan.type(obj) + " value)" ); |
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51 } |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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52 } |