Mercurial Hosting > luan
view src/luan/interp/LenExpr.java @ 31:5cf15507d77e
separate interpreter from interface
git-svn-id: https://luan-java.googlecode.com/svn/trunk@32 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
---|---|
date | Thu, 13 Dec 2012 02:50:04 +0000 |
parents | b7d7069fee58 |
children | e51906de0f11 |
line wrap: on
line source
package luan.interp; import luan.Lua; import luan.LuaNumber; import luan.LuaTable; import luan.LuaException; final class LenExpr extends UnaryOpExpr { LenExpr(Expr op) { super(op); } @Override public Object eval(LuaStateImpl lua) throws LuaException { return new LuaNumber( length(op.eval(lua)) ); } private static int length(Object obj) throws LuaException { if( obj instanceof String ) { String s = (String)obj; return s.length(); } if( obj instanceof LuaTable ) { LuaTable t = (LuaTable)obj; return t.length(); } throw new LuaException( "attempt to get length of a " + Lua.type(obj) + " value" ); } }