Table unit tests and implementation of table.remove(), table.sort()

src/addon/java/lua/addon/luacompat/LuaCompat.java

@@ -663,24 +663,26 @@ public class LuaCompat extends LFunction {
 	 * If i is greater than j, returns the empty string.
 	 */
 	private void concat(VM vm) {
-		LTable table = (LTable) vm.getArg(0);
+		int n = vm.gettop();
-		LString sep = vm.getArgAsLuaString(1);
+		LTable table = vm.totable(2);
-		int i = vm.getArgAsInt(2);
+		LString sep = (n>2? vm.tolstring(3): null);
-		int j = vm.getArgAsInt(3);
+		int i = vm.tointeger(4);
-		LValue[] keys = table.getKeys();
+		int j = vm.tointeger(5);
+		int len = table.luaLength();
 		if ( i == 0 ) 
 			i = 1;
 		if ( j == 0 ) 
-			j = keys.length;
+			j = len;
 		ByteArrayOutputStream baos = new ByteArrayOutputStream();
 		try {
 			for ( int k=i; k<=j; k++ ) {
-				LValue v = table.get(keys[k-1]);
+				LValue v = table.get(k);
 					v.luaAsString().write(baos);
-					if ( k<j )
+					if ( k<j && sep!=null )
 						sep.write( baos );
 			}
-			vm.setResult( new LString( baos.toByteArray() ) );
+			vm.settop(0);
+			vm.pushlstring( baos.toByteArray() );
 		} catch (IOException e) {
 			vm.error(e.getMessage());
 		}
@@ -693,10 +695,10 @@ public class LuaCompat extends LFunction {
 	 * table.insert(t,x) inserts x at the end of table t.
 	 */ 
 	private void insert(VM vm) {
-		int n = vm.getArgCount();
+		int n = vm.gettop();
-		LTable table = (LTable) vm.getArg(0);
+		LTable table = vm.totable(2);
-		int pos = (n>2? vm.getArgAsInt(1): 0);
+		int pos = (n>3? vm.tointeger(3): 0);
-		LValue value = vm.getArg(n-1);
+		LValue value = vm.topointer(-1);
 		table.luaInsertPos( pos, value );
 	}
 
@@ -707,8 +709,9 @@ public class LuaCompat extends LFunction {
 	 * indices. (To do its job this function does a linear traversal of the whole table.)
 	 */ 
 	private void maxn(VM vm) {
-		LTable table = (LTable) vm.getArg(0);
+		LTable table = vm.totable(2);
-		vm.setResult( LInteger.valueOf( table.luaMaxN() ) );
+		vm.settop(0);
+		vm.pushinteger( table.luaMaxN() );
 	}
 
 
@@ -719,9 +722,9 @@ public class LuaCompat extends LFunction {
 	 * so that a call table.remove(t) removes the last element of table t.
 	 */ 
 	private void remove(VM vm) {
-		int n = vm.getArgCount();
+		int n = vm.gettop();
-		LTable table = (LTable) vm.getArg(0);
+		LTable table = vm.totable(2);
-		int pos = (n>1? vm.getArgAsInt(1): 0);
+		int pos = (n>1? vm.tointeger(3): 0);
 		table.luaRemovePos( pos );
 	}
 
@@ -735,7 +738,8 @@ public class LuaCompat extends LFunction {
 	 * The sort algorithm is not stable; that is, elements considered equal by the given order may have their relative positions changed by the sort.
 	 */ 
 	private void sort(VM vm) {
-		LTable table = (LTable) vm.getArg(0);
+		LTable table = vm.totable(2);
-		table.luaSort();
+		LValue compare = vm.topointer(3);
+		table.luaSort( vm, compare );
 	}
 }

src/main/java/lua/StackState.java

@@ -1011,6 +1011,10 @@ public class StackState extends Lua implements VM {
 		pushlvalue(new LString(bytes, offset, length));
 	}
 
+	public void pushlstring(byte[] byteArray) {
+		pushlstring(byteArray, 0, byteArray.length);
+	}
+	
 	public void pushnil() {
 		pushlvalue(LNil.NIL);
 	}

src/main/java/lua/VM.java

@@ -4,6 +4,7 @@ import java.io.InputStream;
 
 import lua.io.Closure;
 import lua.value.LString;
+import lua.value.LTable;
 import lua.value.LValue;
 /**
  * <hr>
@@ -938,6 +939,14 @@ public interface VM {
 	 */
 	public void pushlstring(byte[] bytes, int offset, int length);
 
+	/**
+	 * Push string bytes onto the stack as a string. <span class="apii">[-0, +1,
+	 * <em>m</em>]</span>
+	 * 
+	 * Pushes the bytes in byteArray onto the stack as a lua string. 
+	 */
+	public void pushlstring(byte[] byteArray);
+
 	/** 
 	 * Push an LValue onto the stack. <span class="apii">[-0, +1,
 	 * <em>m</em>]</span>
@@ -1341,6 +1350,15 @@ public interface VM {
 	 */
 	public StackState tothread(int index);
 
+	/**
+	 * Get a value from the stack as a lua table. <span class="apii">[-0, +0, <em>-</em>]</span>
+	 * 
+	 * <p>
+	 * Converts the value at the given acceptable index to a Lua table
+	 * This value must be a table otherwise, the function returns <code>NIL</code>.
+	 */
+	public LTable totable(int index);
+
 	/**
 	 * Get the Object from a userdata value. <span class="apii">[-0, +0,
 	 * <em>-</em>]</span>

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

@@ -1,5 +1,7 @@
 package lua.value;
 
+import java.util.Arrays;
+
 import lua.Lua;
 import lua.VM;
 
@@ -513,25 +515,98 @@ public class LTable extends LValue {
 		return m_vector.length;
 	}
 
-	/*
+	/**
+	 * Insert element at a position in the list.
 	 * @pos index to insert at, or 0 to insert at end.
 	 */
 	public void luaInsertPos(int pos, LValue value) {
-		if ( pos != 0 )
+		if ( pos > m_arrayEntries + 1 )
-			throw new RuntimeException("luaInsertPos() not implemented");
+			put( pos, value );
-		put( m_arrayEntries + m_hashEntries + 1, value );
+		else {
-	}
+			final int index = Math.max(0,pos==0? m_arrayEntries: pos-1);
-
+			if ( m_arrayEntries + 1 > m_vector.length )
-	public void luaSort() {
+				resize( ( m_arrayEntries + 1 ) * 2 );
-		throw new RuntimeException("luaSort() not implemented");
+			if ( m_vector[index] != LNil.NIL ) {
+				System.arraycopy(m_vector, index, m_vector, index+1, m_vector.length-1-index);
+			}
+			m_vector[index] = value;
+			++m_arrayEntries;
+		}
 	}
 
+	/**
+	 * Remove an element from the list part of the table
+	 * @param pos position to remove, or 0 to remove last element
+	 */
 	public void luaRemovePos(int pos) {
-		throw new RuntimeException("luaRemovePos() not implemented");
+		if ( pos > m_arrayEntries ) {
+			put( pos, LNil.NIL );
+		} else {
+			final int index = Math.max(0,pos<=0? m_arrayEntries: pos)-1;
+			if ( index < 0 )
+				return;
+			System.arraycopy(m_vector, index+1, m_vector, index, m_vector.length-1-index);
+			m_vector[m_vector.length-1] = LNil.NIL;
+			--m_arrayEntries;
+		}
 	}
 
 	public int luaMaxN() {
-		throw new RuntimeException("luaMaxN() not implemented");
+		return m_arrayEntries;
+	}
+
+	// ----------------- sort support -----------------------------
+	//
+	// implemented heap sort from wikipedia
+	//
+	public void luaSort(VM vm, LValue compare) {
+		heapSort(m_arrayEntries, vm, compare);
+	}
+	
+	private void heapSort(int count, VM vm, LValue cmpfunc) {
+		heapify(count, vm, cmpfunc);
+		for ( int end=count-1; end>0; ) {
+			swap(end, 0);
+			siftDown(0, --end, vm, cmpfunc);
+		}
+	}
+
+	private void heapify(int count, VM vm, LValue cmpfunc) {
+		for ( int start=count/2-1; start>=0; --start )
+			siftDown(start, count - 1, vm, cmpfunc);
+	}
+
+	private void siftDown(int start, int end, VM vm, LValue cmpfunc) {
+		for ( int root=start; root*2+1 <= end; ) { 
+			int child = root*2+1; 
+			if (child < end && compare(child, child + 1, vm, cmpfunc))
+				++child; 
+			if (compare(root, child, vm, cmpfunc)) {
+				swap(root, child);
+				root = child;
+			} else
+				return;
+		}
+	}
+
+	private boolean compare(int i, int j, VM vm, LValue cmpfunc) {
+		if ( cmpfunc != LNil.NIL ) {
+			vm.pushlvalue(cmpfunc);
+			vm.pushlvalue(m_vector[i]);
+			vm.pushlvalue(m_vector[j]);
+			vm.call(2, 1);
+			boolean result = vm.toboolean(1);
+			vm.settop(0);
+			return result;
+		} else {
+			return m_vector[j].luaBinCmpUnknown( Lua.OP_LT, m_vector[i] );
+		}
+	}
+	
+	private void swap(int i, int j) {
+		LValue tmp = m_vector[i];
+		m_vector[i] = m_vector[j];
+		m_vector[j] = tmp;
 	}
 
 }

src/test/java/LuacRunner.java

@@ -30,7 +30,7 @@ public class LuacRunner {
 		LuaJava.install();
 		
 		// new lua state 
-		StackState state = new DebugStackState();
+		StackState state = new StackState();
 		VM vm = state;
 
 		// load the file

src/test/java/lua/LuaJTest.java

@@ -96,6 +96,10 @@ public class LuaJTest extends TestCase {
 		runTest( "strlib" );
 	}
 	
+	public void testTable() throws IOException, InterruptedException {
+		runTest( "table" );
+	}
+
 	public void testType() throws IOException, InterruptedException {
 		runTest( "type" );
 	}
@@ -120,7 +124,7 @@ public class LuaJTest extends TestCase {
 		LuaCompat.install();
 		
 		// new lua state 
-		StackState state = new DebugStackState();
+		StackState state = new StackState();
 		
 		// load the file
 		Proto p = loadScriptResource( state, testName );