Fix basic class processing via metatables. Make print output more closely match that produces by C interpreter

src/main/java/lua/Builtin.java

@@ -36,7 +36,7 @@ final class Builtin extends LFunction {
 		switch ( id ) {
 		case PRINT:
 			for ( int i=base+1; i<top; i++ ) {
-				System.out.print( String.valueOf(state.stack[i]) );
+				System.out.print( state.stack[i].luaAsString() );
 				System.out.print( "\t" );
 			}
 			System.out.println();
@@ -53,7 +53,8 @@ final class Builtin extends LFunction {
 			break;
 		case SETMETATABLE:
 			state.stack[base+1].luaSetMetatable(state.stack[base+2]);
-			state.top = base;
+			state.stack[base] = state.stack[base+1];
+			state.top = base+1;
 			break;
 		default:
 			luaUnsupportedOperation();

src/main/java/lua/io/Closure.java

@@ -1,9 +1,10 @@
 package lua.io;
 
 import lua.StackState;
+import lua.value.LFunction;
 import lua.value.LValue;
 
-public class Closure extends LValue {
+public class Closure extends LFunction {
 	public LValue env;
 	public Proto p;
 	public UpVal[] upVals;
@@ -19,8 +20,4 @@ public class Closure extends LValue {
 	public void luaStackCall(StackState state, int base, int top, int nresults) {
 		state.setupCall( this, base, top );
 	}
-
-	public String toString() {
-		return "closure: "+hashCode();
-	}
 }

src/main/java/lua/io/Proto.java

@@ -38,7 +38,7 @@ public class Proto extends LValue {
 	public int maxstacksize;
 
 
-	public String toString() {
-		return "proto: "+hashCode();
+	public String luaAsString() {
+		return "proto: "+id();
 	}
 }

src/main/java/lua/io/UpVal.java

@@ -14,7 +14,7 @@ public class UpVal {
 	}
 		
 	public String toString() {
-		return "up("+name+")";
+		return "up."+name;
 	}
 
 }

src/main/java/lua/value/LFunction.java

@@ -4,7 +4,7 @@ import lua.StackState;
 
 public class LFunction extends LValue {
 
-	public String toString() {
+	public String luaAsString() {
 		return "function: "+hashCode();
 	}
 

src/main/java/lua/value/LTable.java

@@ -50,10 +50,14 @@ public class LTable extends LValue {
 		state.stack[base] = val;
 	}
 	
-	public String luaAsString() {
+	public String toString() {
 		return m_hash.toString();
 	}
 	
+	public String luaAsString() {
+		return "table: "+id();
+	}
+	
 	/** Built-in opcode LEN, for Strings and Tables */
 	public LValue luaLength() {
 		return new LInteger( m_hash.size() );

src/main/java/lua/value/LValue.java

@@ -10,6 +10,10 @@ public class LValue {
 		throw new java.lang.UnsupportedOperationException();
 	}
 
+	public String id() {
+		return Integer.toHexString(hashCode());
+	}
+	
 	// test if value is true
 	public boolean luaAsBoolean() {
 		return true;

src/test/res/test6.lua

@@ -1,8 +1,11 @@
+
 t = { 11, 22, 33, you='one', me='two' }
 
+print( "---------" )
 for a,b in pairs(t) do
 	print( a, b )
 end
+print( "----" )
 print( "t[2]", t[2] )
 print( "t.me", t.me )
 print( "t.fred", t.fred )
@@ -24,9 +27,11 @@ d = t.you
 t[4] = 'rat'
 t[1] = 'pipe'
 print( a, b, c, d )
+print( "---------" )
 for a,b in pairs(t) do
 	print( a, b )
 end
+print( "----" )
 
 -- delegate to actual metatable
 s = { }
@@ -38,6 +43,52 @@ print( t.x )
 me = 'here'
 print( t.me )
 t[5] = 99
+print( "---------" )
 for a,b in pairs(s) do
 	print( a, b )
 end
+print( "----" )
+
+Vector = {}
+Vector_mt = { __index = Vector }
+
+function Vector:new(x,y)
+   return setmetatable( {x=x, y=y}, Vector_mt)
+end
+ 
+function Vector:mag()
+   return math.sqrt(self:dot(self))
+ end
+ 
+function Vector:dot(v)
+   return self.x * v.x + self.y * v.y
+end
+ 
+v1 = Vector:new(3,4)
+print( "--------" )
+for a,b in pairs(v1) do
+	print( a, b )
+end
+print( "----" )
+
+v2 = Vector:new(2,1)
+print( v2:dot(v1) )
+
+print( Vector )
+
+print( "---------" )
+for a,b in pairs(Vector) do
+	print( a, b )
+end
+print( "----" )
+
+print( v1, v2 )
+
+print( Vector_mt, getmetatable(v1), getmetatable(v2) )
+
+print( "---------" )
+for a,b in pairs(Vector_mt) do
+	print( a, b )
+end
+print( "----" )
+