| /* |
| * Copyright (C) 2016 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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. |
| */ |
| |
| Object.defineProperty(Array.prototype, "lastValue", |
| { |
| get() |
| { |
| if (!this.length) |
| return undefined; |
| return this[this.length - 1]; |
| } |
| }); |
| |
| Object.defineProperty(String.prototype, "lineEndings", |
| { |
| value() |
| { |
| let lineEndings = []; |
| let pattern = /\r\n?|\n/g; |
| let match = pattern.exec(this); |
| while (match) { |
| lineEndings.push(match.index); |
| match = pattern.exec(this); |
| } |
| |
| lineEndings.push(this.length); |
| return lineEndings; |
| } |
| }); |
| |
| // Whitespace helpers from Esprima. |
| |
| // ECMA-262 11.2 White Space |
| function isECMAScriptWhitespace(ch) { |
| return (ch === 0x20) || (ch === 0x09) || (ch === 0x0B) || (ch === 0x0C) || (ch === 0xA0) || |
| (ch >= 0x1680 && [0x1680, 0x180E, 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200A, 0x202F, 0x205F, 0x3000, 0xFEFF].indexOf(ch) >= 0); |
| } |
| |
| // ECMA-262 11.3 Line Terminators |
| function isECMAScriptLineTerminator(ch) { |
| return (ch === 0x0A) || (ch === 0x0D) || (ch === 0x2028) || (ch === 0x2029); |
| } |