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view src/luan/interp/LtExpr.java @ 35:e51906de0f11
implement metatables
git-svn-id: https://luan-java.googlecode.com/svn/trunk@36 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 18 Dec 2012 07:05:58 +0000 |
parents | 5cf15507d77e |
children | 8a57ebfdfd78 |
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package luan.interp; import luan.Lua; import luan.LuaNumber; import luan.LuaFunction; import luan.LuaException; final class LtExpr extends BinaryOpExpr { LtExpr(Expr op1,Expr op2) { super(op1,op2); } @Override public Object eval(LuaStateImpl lua) throws LuaException { Object o1 = op1.eval(lua); Object o2 = op2.eval(lua); if( o1 instanceof LuaNumber && o2 instanceof LuaNumber ) { LuaNumber n1 = (LuaNumber)o1; LuaNumber n2 = (LuaNumber)o2; return n1.compareTo(n2) < 0; } if( o1 instanceof String && o2 instanceof String ) { String s1 = (String)o1; String s2 = (String)o2; return s1.compareTo(s2) < 0; } LuaFunction fn = getBinHandler("__lt",o1,o2); if( fn != null ) return Lua.toBoolean( Utils.first(fn.call(lua,o1,o2)) ); throw new LuaException( "attempt to compare " + Lua.type(o1) + " with " + Lua.type(o2) ); } }