v8/test/mjsunit/tools/splaytree.js

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// Copyright 2009 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Load the Splay tree implementation from <project root>/tools.
// Files: tools/splaytree.js
(function testIsEmpty() {
var tree = new SplayTree();
assertTrue(tree.isEmpty());
tree.insert(0, 'value');
assertFalse(tree.isEmpty());
})();
(function testExportValues() {
var tree = new SplayTree();
assertArrayEquals([], tree.exportValues());
tree.insert(0, 'value');
assertArrayEquals(['value'], tree.exportValues());
tree.insert(0, 'value');
assertArrayEquals(['value'], tree.exportValues());
})();
function createSampleTree() {
// Creates the following tree:
// 50
// / \
// 30 60
// / \ \
// 10 40 90
// \ / \
// 20 70 100
// / \
// 15 80
//
// We can't use the 'insert' method because it also uses 'splay_'.
return { key: 50, value: 50,
left: { key: 30, value: 30,
left: { key: 10, value: 10, left: null,
right: { key: 20, value: 20,
left: { key: 15, value: 15,
left: null, right: null },
right: null } },
right: { key: 40, value: 40, left: null, right: null } },
right: { key: 60, value: 60, left: null,
right: { key: 90, value: 90,
left: { key: 70, value: 70, left: null,
right: { key: 80, value: 80,
left: null, right: null } },
right: { key: 100, value: 100,
left: null, right: null } } } };
};
(function testSplay() {
var tree = new SplayTree();
tree.root_ = createSampleTree();
assertArrayEquals([50, 30, 60, 10, 40, 90, 20, 70, 100, 15, 80],
tree.exportValues());
tree.splay_(50);
assertArrayEquals([50, 30, 60, 10, 40, 90, 20, 70, 100, 15, 80],
tree.exportValues());
tree.splay_(80);
assertArrayEquals([80, 60, 90, 50, 70, 100, 30, 10, 40, 20, 15],
tree.exportValues());
})();
(function testInsert() {
var tree = new SplayTree();
tree.insert(5, 'root');
tree.insert(3, 'left');
assertArrayEquals(['left', 'root'], tree.exportValues());
tree.insert(7, 'right');
assertArrayEquals(['right', 'root', 'left'], tree.exportValues());
})();
(function testFind() {
var tree = new SplayTree();
tree.insert(5, 'root');
tree.insert(3, 'left');
tree.insert(7, 'right');
assertEquals('root', tree.find(5).value);
assertEquals('left', tree.find(3).value);
assertEquals('right', tree.find(7).value);
assertEquals(null, tree.find(0));
assertEquals(null, tree.find(100));
assertEquals(null, tree.find(-100));
})();
(function testFindMin() {
var tree = new SplayTree();
assertEquals(null, tree.findMin());
tree.insert(5, 'root');
tree.insert(3, 'left');
tree.insert(7, 'right');
assertEquals('left', tree.findMin().value);
})();
(function testFindMax() {
var tree = new SplayTree();
assertEquals(null, tree.findMax());
tree.insert(5, 'root');
tree.insert(3, 'left');
tree.insert(7, 'right');
assertEquals('right', tree.findMax().value);
})();
(function testFindGreatestLessThan() {
var tree = new SplayTree();
assertEquals(null, tree.findGreatestLessThan(10));
tree.insert(5, 'root');
tree.insert(3, 'left');
tree.insert(7, 'right');
assertEquals('right', tree.findGreatestLessThan(10).value);
assertEquals('right', tree.findGreatestLessThan(7).value);
assertEquals('root', tree.findGreatestLessThan(6).value);
assertEquals('left', tree.findGreatestLessThan(4).value);
assertEquals(null, tree.findGreatestLessThan(2));
})();
(function testRemove() {
var tree = new SplayTree();
assertThrows('tree.remove(5)');
tree.insert(5, 'root');
tree.insert(3, 'left');
tree.insert(7, 'right');
assertThrows('tree.remove(1)');
assertThrows('tree.remove(6)');
assertThrows('tree.remove(10)');
assertEquals('root', tree.remove(5).value);
assertEquals('left', tree.remove(3).value);
assertEquals('right', tree.remove(7).value);
assertArrayEquals([], tree.exportValues());
})();