Mercurial Hosting > luan
view core/src/luan/impl/LenExpr.java @ 587:fa281ee942c8
minor
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Mon, 24 Aug 2015 04:43:55 -0600 |
parents | 60c549d43988 |
children | 859c0dedc8b6 |
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package luan.impl; import luan.Luan; import luan.LuanTable; import luan.LuanFunction; import luan.LuanException; import luan.LuanElement; final class LenExpr extends UnaryOpExpr { LenExpr(LuanElement el,Expr op) { super(el,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(); } if( o instanceof byte[] ) { byte[] a = (byte[])o; return a.length; } luan.push(el,null); try { if( !(o instanceof LuanTable) ) throw new LuanException(luan, "attempt to get length of a " + Luan.type(o) + " value" ); LuanTable t = (LuanTable)o; return t.length(luan); } finally { luan.pop(); } } }