mirror of https://gitee.com/openkylin/nodejs.git
108 lines
2.7 KiB
JavaScript
108 lines
2.7 KiB
JavaScript
// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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'use strict';
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// Flags: --expose-internals
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require('../common');
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const assert = require('assert');
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const L = require('internal/linkedlist');
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const list = { name: 'list' };
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const A = { name: 'A' };
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const B = { name: 'B' };
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const C = { name: 'C' };
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const D = { name: 'D' };
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L.init(list);
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L.init(A);
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L.init(B);
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L.init(C);
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L.init(D);
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assert.ok(L.isEmpty(list));
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assert.strictEqual(L.peek(list), null);
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L.append(list, A);
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// list -> A
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assert.strictEqual(L.peek(list), A);
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L.append(list, B);
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// list -> A -> B
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assert.strictEqual(L.peek(list), A);
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L.append(list, C);
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// list -> A -> B -> C
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assert.strictEqual(L.peek(list), A);
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L.append(list, D);
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// list -> A -> B -> C -> D
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assert.strictEqual(L.peek(list), A);
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L.remove(A);
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L.remove(B);
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// B is already removed, so removing it again shouldn't hurt.
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L.remove(B);
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// list -> C -> D
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assert.strictEqual(L.peek(list), C);
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// Put B back on the list
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L.append(list, B);
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// list -> C -> D -> B
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assert.strictEqual(L.peek(list), C);
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L.remove(C);
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// list -> D -> B
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assert.strictEqual(L.peek(list), D);
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L.remove(B);
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// list -> D
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assert.strictEqual(L.peek(list), D);
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L.remove(D);
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// list
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assert.strictEqual(L.peek(list), null);
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assert.ok(L.isEmpty(list));
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L.append(list, D);
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// list -> D
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assert.strictEqual(L.peek(list), D);
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L.append(list, C);
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L.append(list, B);
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L.append(list, A);
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// list -> D -> C -> B -> A
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// Append should REMOVE C from the list and append it to the end.
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L.append(list, C);
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// list -> D -> B -> A -> C
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assert.strictEqual(L.peek(list), D);
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assert.strictEqual(L.peek(D), B);
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assert.strictEqual(L.peek(B), A);
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assert.strictEqual(L.peek(A), C);
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assert.strictEqual(L.peek(C), list);
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