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view src/luan/Lua.java @ 1:2df768b926aa
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git-svn-id: https://luan-java.googlecode.com/svn/trunk@2 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 13 Nov 2012 05:54:32 +0000 |
parents | |
children | 4da26b11d12a |
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package luan; public class Lua { public static String toString(Object obj) { if( obj == null ) return "nil"; return obj.toString(); } public static String type(Object obj) { if( obj == null ) return "nil"; if( obj instanceof String ) return "string"; if( obj instanceof Boolean ) return "boolean"; if( obj instanceof LuaNumber ) return "number"; return "userdata"; } public 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 " + type(obj) + " value" ); } static LuaNumber toNumber(Object obj) throws LuaException { if( obj instanceof LuaNumber ) return (LuaNumber)obj; if( obj instanceof String ) { String s = (String)obj; try { return new LuaNumber( Double.parseDouble(s) ); } catch(NumberFormatException e) {} } throw new LuaException( "attempt to perform arithmetic on a " + type(obj) + " value" ); } static LuaNumber add(Object n1,Object n2) throws LuaException { return new LuaNumber( toNumber(n1).n + toNumber(n2).n ); } static LuaNumber sub(Object n1,Object n2) throws LuaException { return new LuaNumber( toNumber(n1).n - toNumber(n2).n ); } }