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BinTree = (function(window) { var global = window; var require = function(name) { var fn = require.m[name]; if (fn.mod) { return fn.mod.exports; } var mod = fn.mod = { exports: {} }; fn(mod, mod.exports); return mod.exports; }; require.m = {}; require.m['./treebase'] = function(module, exports) { function TreeBase() {} // removes all nodes from the tree TreeBase.prototype.clear = function() { this._root = null; this.size = 0; }; // returns node data if found, null otherwise TreeBase.prototype.find = function(data) { var res = this._root; while(res !== null) { var c = this._comparator(data, res.data); if(c === 0) { return res.data; } else { res = res.get_child(c > 0); } } return null; }; // returns iterator to node if found, null otherwise TreeBase.prototype.findIter = function(data) { var res = this._root; var iter = this.iterator(); while(res !== null) { var c = this._comparator(data, res.data); if(c === 0) { iter._cursor = res; return iter; } else { iter._ancestors.push(res); res = res.get_child(c > 0); } } return null; }; // Returns an iterator to the tree node at or immediately after the item TreeBase.prototype.lowerBound = function(item) { var cur = this._root; var iter = this.iterator(); var cmp = this._comparator; while(cur !== null) { var c = cmp(item, cur.data); if(c === 0) { iter._cursor = cur; return iter; } iter._ancestors.push(cur); cur = cur.get_child(c > 0); } for(var i=iter._ancestors.length - 1; i >= 0; --i) { cur = iter._ancestors[i]; if(cmp(item, cur.data) < 0) { iter._cursor = cur; iter._ancestors.length = i; return iter; } } iter._ancestors.length = 0; return iter; }; // Returns an iterator to the tree node immediately after the item TreeBase.prototype.upperBound = function(item) { var iter = this.lowerBound(item); var cmp = this._comparator; while(iter.data() !== null && cmp(iter.data(), item) === 0) { iter.next(); } return iter; }; // returns null if tree is empty TreeBase.prototype.min = function() { var res = this._root; if(res === null) { return null; } while(res.left !== null) { res = res.left; } return res.data; }; // returns null if tree is empty TreeBase.prototype.max = function() { var res = this._root; if(res === null) { return null; } while(res.right !== null) { res = res.right; } return res.data; }; // returns a null iterator // call next() or prev() to point to an element TreeBase.prototype.iterator = function() { return new Iterator(this); }; // calls cb on each node's data, in order TreeBase.prototype.each = function(cb) { var it=this.iterator(), data; while((data = it.next()) !== null) { cb(data); } }; // calls cb on each node's data, in reverse order TreeBase.prototype.reach = function(cb) { var it=this.iterator(), data; while((data = it.prev()) !== null) { cb(data); } }; function Iterator(tree) { this._tree = tree; this._ancestors = []; this._cursor = null; } Iterator.prototype.data = function() { return this._cursor !== null ? this._cursor.data : null; }; // if null-iterator, returns first node // otherwise, returns next node Iterator.prototype.next = function() { if(this._cursor === null) { var root = this._tree._root; if(root !== null) { this._minNode(root); } } else { if(this._cursor.right === null) { // no greater node in subtree, go up to parent // if coming from a right child, continue up the stack var save; do { save = this._cursor; if(this._ancestors.length) { this._cursor = this._ancestors.pop(); } else { this._cursor = null; break; } } while(this._cursor.right === save); } else { // get the next node from the subtree this._ancestors.push(this._cursor); this._minNode(this._cursor.right); } } return this._cursor !== null ? this._cursor.data : null; }; // if null-iterator, returns last node // otherwise, returns previous node Iterator.prototype.prev = function() { if(this._cursor === null) { var root = this._tree._root; if(root !== null) { this._maxNode(root); } } else { if(this._cursor.left === null) { var save; do { save = this._cursor; if(this._ancestors.length) { this._cursor = this._ancestors.pop(); } else { this._cursor = null; break; } } while(this._cursor.left === save); } else { this._ancestors.push(this._cursor); this._maxNode(this._cursor.left); } } return this._cursor !== null ? this._cursor.data : null; }; Iterator.prototype._minNode = function(start) { while(start.left !== null) { this._ancestors.push(start); start = start.left; } this._cursor = start; }; Iterator.prototype._maxNode = function(start) { while(start.right !== null) { this._ancestors.push(start); start = start.right; } this._cursor = start; }; module.exports = TreeBase; }; require.m['__main__'] = function(module, exports) { var TreeBase = require('./treebase'); function Node(data) { this.data = data; this.left = null; this.right = null; } Node.prototype.get_child = function(dir) { return dir ? this.right : this.left; }; Node.prototype.set_child = function(dir, val) { if(dir) { this.right = val; } else { this.left = val; } }; function BinTree(comparator) { this._root = null; this._comparator = comparator; this.size = 0; } BinTree.prototype = new TreeBase(); // returns true if inserted, false if duplicate BinTree.prototype.insert = function(data) { if(this._root === null) { // empty tree this._root = new Node(data); this.size++; return true; } var dir = 0; // setup var p = null; // parent var node = this._root; // search down while(true) { if(node === null) { // insert new node at the bottom node = new Node(data); p.set_child(dir, node); ret = true; this.size++; return true; } // stop if found if(this._comparator(node.data, data) === 0) { return false; } dir = this._comparator(node.data, data) < 0; // update helpers p = node; node = node.get_child(dir); } }; // returns true if removed, false if not found BinTree.prototype.remove = function(data) { if(this._root === null) { return false; } var head = new Node(undefined); // fake tree root var node = head; node.right = this._root; var p = null; // parent var found = null; // found item var dir = 1; while(node.get_child(dir) !== null) { p = node; node = node.get_child(dir); var cmp = this._comparator(data, node.data); dir = cmp > 0; if(cmp === 0) { found = node; } } if(found !== null) { found.data = node.data; p.set_child(p.right === node, node.get_child(node.left === null)); this._root = head.right; this.size--; return true; } else { return false; } }; module.exports = BinTree; }; return require('__main__'); })(window);
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