85 lines
2.5 KiB
TypeScript
85 lines
2.5 KiB
TypeScript
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/*************************************************************
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*
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* Copyright (c) 2017-2022 The MathJax Consortium
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Implements some string utility functions
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*
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* @author dpvc@mathjax.org (Davide Cervone)
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*/
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/**
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* Sort strings by length
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*
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* @param {string} a First string to be compared
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* @param {string} b Second string to be compared
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* @return {number} -1 id a < b, 0 of a === b, 1 if a > b
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*/
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export function sortLength(a: string, b: string): number {
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return a.length !== b.length ? b.length - a.length : a === b ? 0 : a < b ? -1 : 1;
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}
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/**
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* Quote a string for use in regular expressions
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*
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* @param {string} text The text whose regex characters are to be quoted
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* @return {string} The quoted string
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*/
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export function quotePattern(text: string): string {
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return text.replace(/([\^$(){}+*?\-|\[\]\:\\])/g, '\\$1');
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}
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/**
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* Convert a UTF-8 string to an array of unicode code points
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*
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* @param {string} text The string to be turned into unicode positions
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* @return {number[]} Array of numbers representing the string's unicode character positions
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*/
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export function unicodeChars(text: string): number[] {
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return Array.from(text).map((c) => c.codePointAt(0));
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}
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/**
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* Convert an array of unicode code points to a string
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*
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* @param {number[]} data The array of unicode code points
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* @return {string} The string consisting of the characters at those points
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*/
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export function unicodeString(data: number[]): string {
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return String.fromCodePoint(...data);
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}
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/**
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* Test if a value is a percentage
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*
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* @param {string} x The string to test
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* @return {boolean} True if the string ends with a percent sign
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*/
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export function isPercent(x: string): boolean {
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return !!x.match(/%\s*$/);
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}
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/**
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* Split a space-separated string of values
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*
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* @param {string} x The string to be split
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* @return {string[]} The list of white-space-separated "words" in the string
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*/
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export function split(x: string): string[] {
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return x.trim().split(/\s+/);
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}
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