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view src/luan/interp/LenExpr.java @ 112:f5af13062b10
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git-svn-id: https://luan-java.googlecode.com/svn/trunk@113 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 23 May 2014 22:52:39 +0000 |
parents | 6ca02b188dba |
children | c599206448b9 |
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package luan.interp; import luan.Luan; import luan.LuanTable; import luan.LuanFunction; import luan.LuanException; import luan.LuanSource; import luan.LuanBit; final class LenExpr extends UnaryOpExpr { LenExpr(LuanSource.Element se,Expr op) { super(se,op); } @Override public Object eval(LuanStateImpl luan) throws LuanException { Object o = op.eval(luan); if( o instanceof String ) { String s = (String)o; return s.length(); } LuanBit bit = luan.bit(se); LuanFunction fn = bit.getHandlerFunction("__len",o); if( fn != null ) return Luan.first(bit.call(fn,"__len",new Object[]{o})); if( o instanceof LuanTable ) { LuanTable t = (LuanTable)o; return t.length(); } throw bit.exception( "attempt to get length of a " + Luan.type(o) + " value" ); } }