initial commit

libjs/wContainer/abstractmap.js

@@ -0,0 +1,142 @@
+"use strict";
+var Class = require("../utils/class");
+var RBTree = require("bintrees").RBTree;
+var AbstractPair = require("./abstractpair");
+
+var AbstractMap = Class.inherit({
+    "className": "AbstractMap",
+    "constructor": function(owning) {
+        Class.fn.constructor.call(this);
+        
+        this._owning = owning !== false;
+        this._data = new RBTree(function (a, b) {
+            if (a[">"](b)) {
+                return 1;
+            }
+            if (a["<"](b)) {
+                return -1
+            }
+            if (a["=="](b)) {
+                return 0;
+            }
+        });
+    },
+    "destructor": function() {
+        this.clear();
+        
+        Class.fn.destructor.call(this);
+    },
+    "begin": function() {
+        var itr = this._data.iterator();
+        if (itr.next() !== null) {
+            return new Iterator(itr);
+        }
+        return this.end();
+    },
+    "clear": function() {
+        if (this._owning) {
+            this._data.each(function(data) {
+                data.destructor();
+            });
+        }
+        
+        this._data.clear();
+    },
+    "each": function(funct) {
+        this._data.each(funct);
+    },
+    "end": function() {
+        return new Iterator(this._data.iterator());
+    },
+    "erase": function(itr) {
+        var pair = itr["*"]();
+        if (!this._data.remove(pair)) {
+            throw new Error("An attempt to remove non-existing map element");
+        }
+        if (this._owning) {
+            pair.destructor();
+        }
+    },
+    "find": function(key) {
+        var pair = new this.constructor.dataType(key);
+        
+        var iter = this._data.findIter(pair);
+        if (iter === null) {
+            return this.end();
+        }
+        return new Iterator(iter);
+    },
+    "insert": function(key, value) {
+        var pair = new this.constructor.dataType(key, value);
+        
+        if (!this._data.insert(pair)) {
+            throw new Error("An attempt to insert already existing element into a map");
+        }
+    },
+    "r_each": function(funct) {
+        this._data.reach(funct);
+    },
+    "size": function() {
+        return this._data.size;
+    },
+    "lowerBound": function(key) {
+        var pair = new this.constructor.dataType(key);
+        
+        return new Iterator(this._data.lowerBound(pair));
+    },
+    "upperBound": function(key) {
+        var pair = new this.constructor.dataType(key);
+        
+        return new Iterator(this._data.upperBound(pair));
+    }
+});
+
+var Iterator = Class.inherit({
+    "className": "MapIterator",
+    "constructor": function(rbtree_iterator) {
+        Class.fn.constructor.call(this);
+        
+        this._itr = rbtree_iterator;
+    },
+    "++": function() {
+        if ((this._itr._cursor === null)) {
+            throw new Error("An attempt to increment an iterator pointing to the end of the map");
+        }
+        this._itr.next();
+    },
+    "--": function() {
+        this._itr.prev();
+        if ((this._itr._cursor === null)) {
+            throw new Error("An attempt to decrement an iterator pointing to the beginning of the map");
+        }
+    },
+    "==": function(other) {
+        return this._itr.data() === other._itr.data();
+    },
+    "*": function() {
+        if ((this._itr._cursor === null)) {
+            throw new Error("An attempt to dereference an iterator pointing to the end of the map");
+        }
+        return this._itr.data();
+    }
+});
+
+AbstractMap.dataType = undefined;
+AbstractMap.iterator = Iterator;
+
+AbstractMap.template = function(first, second) {
+    var dt = AbstractPair.template(first, second);
+    
+    var Map = AbstractMap.inherit({
+        "className": "Map",
+        "constructor": function(owning) {
+            AbstractMap.fn.constructor.call(this, owning);
+        }
+    });
+    
+    Map.dataType = dt;
+    
+    return Map;
+};
+
+module.exports = AbstractMap;