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comparison src/luan/interp/LenExpr.java @ 40:e3624b7cd603

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implement stack trace git-svn-id: https://luan-java.googlecode.com/svn/trunk@41 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 21 Dec 2012 10:45:54 +0000
parents 8a57ebfdfd78
children 57054fa43189
comparison
equal deleted inserted replaced
39:e5bcb1eeafc1 40:e3624b7cd603
3 import luan.Lua; 3 import luan.Lua;
4 import luan.LuaNumber; 4 import luan.LuaNumber;
5 import luan.LuaTable; 5 import luan.LuaTable;
6 import luan.LuaFunction; 6 import luan.LuaFunction;
7 import luan.LuaException; 7 import luan.LuaException;
8 import luan.LuaSource;
8 9
9 10
10 final class LenExpr extends UnaryOpExpr { 11 final class LenExpr extends UnaryOpExpr {
11 12
12 LenExpr(Expr op) { 13 LenExpr(LuaSource.Element se,Expr op) {
13 super(op); 14 super(se,op);
14 } 15 }
15 16
16 @Override public Object eval(LuaStateImpl lua) throws LuaException { 17 @Override public Object eval(LuaStateImpl lua) throws LuaException {
17 Object o = op.eval(lua); 18 Object o = op.eval(lua);
18 if( o instanceof String ) { 19 if( o instanceof String ) {
19 String s = (String)o; 20 String s = (String)o;
20 return new LuaNumber( s.length() ); 21 return new LuaNumber( s.length() );
21 } 22 }
22 LuaFunction fn = lua.getHandlerFunction("__len",o); 23 LuaFunction fn = lua.getHandlerFunction(se,"__len",o);
23 if( fn != null ) 24 if( fn != null )
24 return Utils.first(fn.call(lua,o)); 25 return Lua.first(lua.call(fn,se,"__len",o));
25 if( o instanceof LuaTable ) { 26 if( o instanceof LuaTable ) {
26 LuaTable t = (LuaTable)o; 27 LuaTable t = (LuaTable)o;
27 return t.length(); 28 return t.length();
28 } 29 }
29 throw new LuaException( "attempt to get length of a " + Lua.type(o) + " value" ); 30 throw new LuaException( lua, se, "attempt to get length of a " + Lua.type(o) + " value" );
30 } 31 }
31 } 32 }