/*---------------------------------------------------------------------------------------------
*  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);
    }
}