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comparison src/luan/interp/LengthExpr.java @ 2:4da26b11d12a

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start interp git-svn-id: https://luan-java.googlecode.com/svn/trunk@3 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 14 Nov 2012 08:53:25 +0000
parents
children 7a2cdbc5767f
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1:2df768b926aa 2:4da26b11d12a
1 package luan.interp;
2
3 import luan.Lua;
4 import luan.LuaNumber;
5 import luan.LuaTable;
6 import luan.LuaException;
7
8
9 final class LengthExpr extends UnaryOpExpr {
10
11 LengthExpr(Expr op) {
12 super(op);
13 }
14
15 @Override Object eval() throws LuaException {
16 return new LuaNumber( length(op.eval()) );
17 }
18
19 private static int length(Object obj) throws LuaException {
20 if( obj instanceof String ) {
21 String s = (String)obj;
22 return s.length();
23 }
24 if( obj instanceof LuaTable ) {
25 LuaTable t = (LuaTable)obj;
26 return t.length();
27 }
28 throw new LuaException( "attempt to get length of a " + Lua.type(obj) + " value" );
29 }
30 }