53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
/*---------------------------------------------------------------------------------------------
|
|
* Copyright (c) Microsoft Corporation. All rights reserved.
|
|
* Licensed under the MIT License. See License.txt in the project root for license information.
|
|
*--------------------------------------------------------------------------------------------*/
|
|
export function startsWith(haystack, needle) {
|
|
if (haystack.length < needle.length) {
|
|
return false;
|
|
}
|
|
for (var i = 0; i < needle.length; i++) {
|
|
if (haystack[i] !== needle[i]) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
/**
|
|
* Determines if haystack ends with needle.
|
|
*/
|
|
export function endsWith(haystack, needle) {
|
|
var diff = haystack.length - needle.length;
|
|
if (diff > 0) {
|
|
return haystack.lastIndexOf(needle) === diff;
|
|
}
|
|
else if (diff === 0) {
|
|
return haystack === needle;
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
export function convertSimple2RegExpPattern(pattern) {
|
|
return pattern.replace(/[\-\\\{\}\+\?\|\^\$\.\,\[\]\(\)\#\s]/g, '\\$&').replace(/[\*]/g, '.*');
|
|
}
|
|
export function repeat(value, count) {
|
|
var s = '';
|
|
while (count > 0) {
|
|
if ((count & 1) === 1) {
|
|
s += value;
|
|
}
|
|
value += value;
|
|
count = count >>> 1;
|
|
}
|
|
return s;
|
|
}
|
|
export function extendedRegExp(pattern) {
|
|
if (startsWith(pattern, '(?i)')) {
|
|
return new RegExp(pattern.substring(4), 'i');
|
|
}
|
|
else {
|
|
return new RegExp(pattern);
|
|
}
|
|
}
|