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annotate src/luan/interp/LenExpr.java @ 46:a443637829c1

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remove LuaNumber git-svn-id: https://luan-java.googlecode.com/svn/trunk@47 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 27 Dec 2012 01:48:36 +0000
parents 57054fa43189
children 64ecb7a3aad7
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1 package luan.interp;
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3 import luan.Lua;
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4 import luan.LuaTable;
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5 import luan.LuaFunction;
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6 import luan.LuaException;
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7 import luan.LuaSource;
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10 final class LenExpr extends UnaryOpExpr {
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12 LenExpr(LuaSource.Element se,Expr op) {
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13 super(se,op);
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14 }
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16 @Override public Object eval(LuaStateImpl lua) throws LuaException {
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17 Object o = op.eval(lua);
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18 if( o instanceof String ) {
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19 String s = (String)o;
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20 return s.length();
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21 }
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22 LuaFunction fn = lua.getHandlerFunction(se,"__len",o);
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23 if( fn != null )
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24 return Lua.first(lua.call(fn,se,"__len",o));
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25 if( o instanceof LuaTable ) {
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26 LuaTable t = (LuaTable)o;
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27 return t.length();
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28 }
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29 throw new LuaException( lua, se, "attempt to get length of a " + Lua.type(o) + " value" );
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30 }
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31 }