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Kha/Tools/macos/std/haxe/ds/GenericStack.hx

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+/*
+ * Copyright (C)2005-2019 Haxe Foundation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+package haxe.ds;
+
+/**
+	A cell of `haxe.ds.GenericStack`.
+
+	@see https://haxe.org/manual/std-GenericStack.html
+**/
+#if (flash || cpp)
+@:generic
+#end
+class GenericCell<T> {
+	public var elt:T;
+	public var next:GenericCell<T>;
+
+	public function new(elt, next) {
+		this.elt = elt;
+		this.next = next;
+	}
+}
+
+#if cpp
+@:generic
+#if cppia
+private class GenericStackIterator<T> {
+	public var current:GenericCell<T>;
+
+	public function hasNext():Bool {
+		return current != null;
+	}
+
+	public function next():T {
+		var result = current.elt;
+		current = current.next;
+		return result;
+	}
+
+	public function new(head) {
+		current = head;
+	}
+}
+#else
+private class GenericStackIterator<T> extends cpp.FastIterator<T> {
+	public var current:GenericCell<T>;
+
+	override public function hasNext():Bool {
+		return current != null;
+	}
+
+	override public function next():T {
+		var result = current.elt;
+		current = current.next;
+		return result;
+	}
+
+	public function new(head) {
+		current = head;
+	}
+}
+#end
+#end
+
+/**
+	A stack of elements.
+
+	This class is generic, which means one type is generated for each type
+	parameter T on static targets. For example:
+
+	- `new GenericStack<Int>()` generates `GenericStack_Int`
+	- `new GenericStack<String>()` generates `GenericStack_String`
+
+	The generated name is an implementation detail and should not be relied
+	upon.
+
+	@see https://haxe.org/manual/std-GenericStack.html
+**/
+#if (flash || cpp)
+@:generic
+#end
+class GenericStack<T> {
+	public var head:GenericCell<T>;
+
+	/**
+		Creates a new empty GenericStack.
+	**/
+	public function new() {}
+
+	/**
+		Pushes element `item` onto the stack.
+	**/
+	public inline function add(item:T) {
+		head = new GenericCell<T>(item, head);
+	}
+
+	/**
+		Returns the topmost stack element without removing it.
+
+		If the stack is empty, null is returned.
+	**/
+	public inline function first():Null<T> {
+		return if (head == null) null else head.elt;
+	}
+
+	/**
+		Returns the topmost stack element and removes it.
+
+		If the stack is empty, null is returned.
+	**/
+	public inline function pop():Null<T> {
+		var k = head;
+		if (k == null)
+			return null;
+		else {
+			head = k.next;
+			return k.elt;
+		}
+	}
+
+	/**
+		Tells if the stack is empty.
+	**/
+	public inline function isEmpty():Bool {
+		return (head == null);
+	}
+
+	/**
+		Removes the first element which is equal to `v` according to the `==`
+		operator.
+
+		This method traverses the stack until it finds a matching element and
+		unlinks it, returning true.
+
+		If no matching element is found, false is returned.
+	**/
+	public function remove(v:T):Bool {
+		var prev:GenericCell<T> = null;
+		var l = head;
+		while (l != null) {
+			if (l.elt == v) {
+				if (prev == null)
+					head = l.next;
+				else
+					prev.next = l.next;
+				break;
+			}
+			prev = l;
+			l = l.next;
+		}
+		return (l != null);
+	}
+
+	#if cpp
+	/**
+		Returns an iterator over the elements of `this` GenericStack.
+	**/
+	public function iterator():Iterator<T> {
+		return new GenericStackIterator<T>(head);
+	}
+	#else
+
+	/**
+		Returns an iterator over the elements of `this` GenericStack.
+	**/
+	public function iterator():Iterator<T> {
+		var l = head;
+		return {
+			hasNext: function() {
+				return l != null;
+			},
+			next: function() {
+				var k = l;
+				l = k.next;
+				return k.elt;
+			}
+		};
+	}
+	#end
+
+	/**
+		Returns a String representation of `this` GenericStack.
+	**/
+	public function toString() {
+		var a = new Array();
+		var l = head;
+		while (l != null) {
+			a.push(l.elt);
+			l = l.next;
+		}
+		return "{" + a.join(",") + "}";
+	}
+}