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azuredatastudio/src/vs/base/common/strings.ts

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This file contains ambiguous Unicode characters
This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the Source EULA. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { CharCode } from 'vs/base/common/charCode';
import { Constants } from 'vs/base/common/uint';
export function isFalsyOrWhitespace(str: string | undefined): boolean {
if (!str || typeof str !== 'string') {
return true;
}
return str.trim().length === 0;
}
/**
* @deprecated ES6: use `String.padStart`
*/
export function pad(n: number, l: number, char: string = '0'): string {
const str = '' + n;
const r = [str];
for (let i = str.length; i < l; i++) {
r.push(char);
}
return r.reverse().join('');
}
const _formatRegexp = /{(\d+)}/g;
/**
* Helper to produce a string with a variable number of arguments. Insert variable segments
* into the string using the {n} notation where N is the index of the argument following the string.
* @param value string to which formatting is applied
* @param args replacements for {n}-entries
*/
export function format(value: string, ...args: any[]): string {
if (args.length === 0) {
return value;
}
return value.replace(_formatRegexp, function (match, group) {
const idx = parseInt(group, 10);
return isNaN(idx) || idx < 0 || idx >= args.length ?
match :
args[idx];
});
}
/**
* Converts HTML characters inside the string to use entities instead. Makes the string safe from
* being used e.g. in HTMLElement.innerHTML.
*/
export function escape(html: string): string {
return html.replace(/[<>&]/g, function (match) {
switch (match) {
case '<': return '&lt;';
case '>': return '&gt;';
case '&': return '&amp;';
default: return match;
}
});
}
/**
* Escapes regular expression characters in a given string
*/
export function escapeRegExpCharacters(value: string): string {
return value.replace(/[\\\{\}\*\+\?\|\^\$\.\[\]\(\)]/g, '\\$&');
}
/**
* Removes all occurrences of needle from the beginning and end of haystack.
* @param haystack string to trim
* @param needle the thing to trim (default is a blank)
*/
export function trim(haystack: string, needle: string = ' '): string {
const trimmed = ltrim(haystack, needle);
return rtrim(trimmed, needle);
}
/**
* Removes all occurrences of needle from the beginning of haystack.
* @param haystack string to trim
* @param needle the thing to trim
*/
export function ltrim(haystack: string, needle: string): string {
if (!haystack || !needle) {
return haystack;
}
const needleLen = needle.length;
if (needleLen === 0 || haystack.length === 0) {
return haystack;
}
let offset = 0;
while (haystack.indexOf(needle, offset) === offset) {
offset = offset + needleLen;
}
return haystack.substring(offset);
}
/**
* Removes all occurrences of needle from the end of haystack.
* @param haystack string to trim
* @param needle the thing to trim
*/
export function rtrim(haystack: string, needle: string): string {
if (!haystack || !needle) {
return haystack;
}
const needleLen = needle.length,
haystackLen = haystack.length;
if (needleLen === 0 || haystackLen === 0) {
return haystack;
}
let offset = haystackLen,
idx = -1;
while (true) {
idx = haystack.lastIndexOf(needle, offset - 1);
if (idx === -1 || idx + needleLen !== offset) {
break;
}
if (idx === 0) {
return '';
}
offset = idx;
}
return haystack.substring(0, offset);
}
export function convertSimple2RegExpPattern(pattern: string): string {
return pattern.replace(/[\-\\\{\}\+\?\|\^\$\.\,\[\]\(\)\#\s]/g, '\\$&').replace(/[\*]/g, '.*');
}
export function stripWildcards(pattern: string): string {
return pattern.replace(/\*/g, '');
}
/**
* @deprecated ES6: use `String.startsWith`
*/
export function startsWith(haystack: string, needle: string): boolean {
if (haystack.length < needle.length) {
return false;
}
if (haystack === needle) {
return true;
}
for (let i = 0; i < needle.length; i++) {
if (haystack[i] !== needle[i]) {
return false;
}
}
return true;
}
/**
* @deprecated ES6: use `String.endsWith`
*/
export function endsWith(haystack: string, needle: string): boolean {
const diff = haystack.length - needle.length;
if (diff > 0) {
return haystack.indexOf(needle, diff) === diff;
} else if (diff === 0) {
return haystack === needle;
} else {
return false;
}
}
export interface RegExpOptions {
matchCase?: boolean;
wholeWord?: boolean;
multiline?: boolean;
global?: boolean;
unicode?: boolean;
}
export function createRegExp(searchString: string, isRegex: boolean, options: RegExpOptions = {}): RegExp {
if (!searchString) {
throw new Error('Cannot create regex from empty string');
}
if (!isRegex) {
searchString = escapeRegExpCharacters(searchString);
}
if (options.wholeWord) {
if (!/\B/.test(searchString.charAt(0))) {
searchString = '\\b' + searchString;
}
if (!/\B/.test(searchString.charAt(searchString.length - 1))) {
searchString = searchString + '\\b';
}
}
let modifiers = '';
if (options.global) {
modifiers += 'g';
}
if (!options.matchCase) {
modifiers += 'i';
}
if (options.multiline) {
modifiers += 'm';
}
if (options.unicode) {
modifiers += 'u';
}
return new RegExp(searchString, modifiers);
}
export function regExpLeadsToEndlessLoop(regexp: RegExp): boolean {
// Exit early if it's one of these special cases which are meant to match
// against an empty string
if (regexp.source === '^' || regexp.source === '^$' || regexp.source === '$' || regexp.source === '^\\s*$') {
return false;
}
// We check against an empty string. If the regular expression doesn't advance
// (e.g. ends in an endless loop) it will match an empty string.
const match = regexp.exec('');
return !!(match && regexp.lastIndex === 0);
}
export function regExpContainsBackreference(regexpValue: string): boolean {
return !!regexpValue.match(/([^\\]|^)(\\\\)*\\\d+/);
}
export function regExpFlags(regexp: RegExp): string {
return (regexp.global ? 'g' : '')
+ (regexp.ignoreCase ? 'i' : '')
+ (regexp.multiline ? 'm' : '')
+ ((regexp as any /* standalone editor compilation */).unicode ? 'u' : '');
}
/**
* Returns first index of the string that is not whitespace.
* If string is empty or contains only whitespaces, returns -1
*/
export function firstNonWhitespaceIndex(str: string): number {
for (let i = 0, len = str.length; i < len; i++) {
const chCode = str.charCodeAt(i);
if (chCode !== CharCode.Space && chCode !== CharCode.Tab) {
return i;
}
}
return -1;
}
/**
* Returns the leading whitespace of the string.
* If the string contains only whitespaces, returns entire string
*/
export function getLeadingWhitespace(str: string, start: number = 0, end: number = str.length): string {
for (let i = start; i < end; i++) {
const chCode = str.charCodeAt(i);
if (chCode !== CharCode.Space && chCode !== CharCode.Tab) {
return str.substring(start, i);
}
}
return str.substring(start, end);
}
/**
* Returns last index of the string that is not whitespace.
* If string is empty or contains only whitespaces, returns -1
*/
export function lastNonWhitespaceIndex(str: string, startIndex: number = str.length - 1): number {
for (let i = startIndex; i >= 0; i--) {
const chCode = str.charCodeAt(i);
if (chCode !== CharCode.Space && chCode !== CharCode.Tab) {
return i;
}
}
return -1;
}
export function compare(a: string, b: string): number {
if (a < b) {
return -1;
} else if (a > b) {
return 1;
} else {
return 0;
}
}
export function compareSubstring(a: string, b: string, aStart: number = 0, aEnd: number = a.length, bStart: number = 0, bEnd: number = b.length): number {
for (; aStart < aEnd && bStart < bEnd; aStart++, bStart++) {
let codeA = a.charCodeAt(aStart);
let codeB = b.charCodeAt(bStart);
if (codeA < codeB) {
return -1;
} else if (codeA > codeB) {
return 1;
}
}
const aLen = aEnd - aStart;
const bLen = bEnd - bStart;
if (aLen < bLen) {
return -1;
} else if (aLen > bLen) {
return 1;
}
return 0;
}
export function compareIgnoreCase(a: string, b: string): number {
return compareSubstringIgnoreCase(a, b, 0, a.length, 0, b.length);
}
export function compareSubstringIgnoreCase(a: string, b: string, aStart: number = 0, aEnd: number = a.length, bStart: number = 0, bEnd: number = b.length): number {
for (; aStart < aEnd && bStart < bEnd; aStart++, bStart++) {
let codeA = a.charCodeAt(aStart);
let codeB = b.charCodeAt(bStart);
if (codeA === codeB) {
// equal
continue;
}
const diff = codeA - codeB;
if (diff === 32 && isUpperAsciiLetter(codeB)) { //codeB =[65-90] && codeA =[97-122]
continue;
} else if (diff === -32 && isUpperAsciiLetter(codeA)) { //codeB =[97-122] && codeA =[65-90]
continue;
}
if (isLowerAsciiLetter(codeA) && isLowerAsciiLetter(codeB)) {
//
return diff;
} else {
return compareSubstring(a.toLowerCase(), b.toLowerCase(), aStart, aEnd, bStart, bEnd);
}
}
const aLen = aEnd - aStart;
const bLen = bEnd - bStart;
if (aLen < bLen) {
return -1;
} else if (aLen > bLen) {
return 1;
}
return 0;
}
export function isLowerAsciiLetter(code: number): boolean {
return code >= CharCode.a && code <= CharCode.z;
}
export function isUpperAsciiLetter(code: number): boolean {
return code >= CharCode.A && code <= CharCode.Z;
}
function isAsciiLetter(code: number): boolean {
return isLowerAsciiLetter(code) || isUpperAsciiLetter(code);
}
export function equalsIgnoreCase(a: string, b: string): boolean {
return a.length === b.length && doEqualsIgnoreCase(a, b);
}
function doEqualsIgnoreCase(a: string, b: string, stopAt = a.length): boolean {
for (let i = 0; i < stopAt; i++) {
const codeA = a.charCodeAt(i);
const codeB = b.charCodeAt(i);
if (codeA === codeB) {
continue;
}
// a-z A-Z
if (isAsciiLetter(codeA) && isAsciiLetter(codeB)) {
const diff = Math.abs(codeA - codeB);
if (diff !== 0 && diff !== 32) {
return false;
}
}
// Any other charcode
else {
if (String.fromCharCode(codeA).toLowerCase() !== String.fromCharCode(codeB).toLowerCase()) {
return false;
}
}
}
return true;
}
export function startsWithIgnoreCase(str: string, candidate: string): boolean {
const candidateLength = candidate.length;
if (candidate.length > str.length) {
return false;
}
return doEqualsIgnoreCase(str, candidate, candidateLength);
}
/**
* @returns the length of the common prefix of the two strings.
*/
export function commonPrefixLength(a: string, b: string): number {
let i: number,
len = Math.min(a.length, b.length);
for (i = 0; i < len; i++) {
if (a.charCodeAt(i) !== b.charCodeAt(i)) {
return i;
}
}
return len;
}
/**
* @returns the length of the common suffix of the two strings.
*/
export function commonSuffixLength(a: string, b: string): number {
let i: number,
len = Math.min(a.length, b.length);
const aLastIndex = a.length - 1;
const bLastIndex = b.length - 1;
for (i = 0; i < len; i++) {
if (a.charCodeAt(aLastIndex - i) !== b.charCodeAt(bLastIndex - i)) {
return i;
}
}
return len;
}
/**
* See http://en.wikipedia.org/wiki/Surrogate_pair
*/
export function isHighSurrogate(charCode: number): boolean {
return (0xD800 <= charCode && charCode <= 0xDBFF);
}
/**
* See http://en.wikipedia.org/wiki/Surrogate_pair
*/
export function isLowSurrogate(charCode: number): boolean {
return (0xDC00 <= charCode && charCode <= 0xDFFF);
}
/**
* See http://en.wikipedia.org/wiki/Surrogate_pair
*/
export function computeCodePoint(highSurrogate: number, lowSurrogate: number): number {
return ((highSurrogate - 0xD800) << 10) + (lowSurrogate - 0xDC00) + 0x10000;
}
/**
* get the code point that begins at offset `offset`
*/
export function getNextCodePoint(str: string, len: number, offset: number): number {
const charCode = str.charCodeAt(offset);
if (isHighSurrogate(charCode) && offset + 1 < len) {
const nextCharCode = str.charCodeAt(offset + 1);
if (isLowSurrogate(nextCharCode)) {
return computeCodePoint(charCode, nextCharCode);
}
}
return charCode;
}
/**
* get the code point that ends right before offset `offset`
*/
function getPrevCodePoint(str: string, offset: number): number {
const charCode = str.charCodeAt(offset - 1);
if (isLowSurrogate(charCode) && offset > 1) {
const prevCharCode = str.charCodeAt(offset - 2);
if (isHighSurrogate(prevCharCode)) {
return computeCodePoint(prevCharCode, charCode);
}
}
return charCode;
}
export function nextCharLength(str: string, offset: number): number {
const graphemeBreakTree = GraphemeBreakTree.getInstance();
const initialOffset = offset;
const len = str.length;
const initialCodePoint = getNextCodePoint(str, len, offset);
offset += (initialCodePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
let graphemeBreakType = graphemeBreakTree.getGraphemeBreakType(initialCodePoint);
while (offset < len) {
const nextCodePoint = getNextCodePoint(str, len, offset);
const nextGraphemeBreakType = graphemeBreakTree.getGraphemeBreakType(nextCodePoint);
if (breakBetweenGraphemeBreakType(graphemeBreakType, nextGraphemeBreakType)) {
break;
}
offset += (nextCodePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
graphemeBreakType = nextGraphemeBreakType;
}
return (offset - initialOffset);
}
export function prevCharLength(str: string, offset: number): number {
const graphemeBreakTree = GraphemeBreakTree.getInstance();
const initialOffset = offset;
const initialCodePoint = getPrevCodePoint(str, offset);
offset -= (initialCodePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
let graphemeBreakType = graphemeBreakTree.getGraphemeBreakType(initialCodePoint);
while (offset > 0) {
const prevCodePoint = getPrevCodePoint(str, offset);
const prevGraphemeBreakType = graphemeBreakTree.getGraphemeBreakType(prevCodePoint);
if (breakBetweenGraphemeBreakType(prevGraphemeBreakType, graphemeBreakType)) {
break;
}
offset -= (prevCodePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
graphemeBreakType = prevGraphemeBreakType;
}
return (initialOffset - offset);
}
function _getCharContainingOffset(str: string, offset: number): [number, number] {
const graphemeBreakTree = GraphemeBreakTree.getInstance();
const len = str.length;
const initialOffset = offset;
const initialCodePoint = getNextCodePoint(str, len, offset);
const initialGraphemeBreakType = graphemeBreakTree.getGraphemeBreakType(initialCodePoint);
offset += (initialCodePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
// extend to the right
let graphemeBreakType = initialGraphemeBreakType;
while (offset < len) {
const nextCodePoint = getNextCodePoint(str, len, offset);
const nextGraphemeBreakType = graphemeBreakTree.getGraphemeBreakType(nextCodePoint);
if (breakBetweenGraphemeBreakType(graphemeBreakType, nextGraphemeBreakType)) {
break;
}
offset += (nextCodePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
graphemeBreakType = nextGraphemeBreakType;
}
const endOffset = offset;
// extend to the left
offset = initialOffset;
graphemeBreakType = initialGraphemeBreakType;
while (offset > 0) {
const prevCodePoint = getPrevCodePoint(str, offset);
const prevGraphemeBreakType = graphemeBreakTree.getGraphemeBreakType(prevCodePoint);
if (breakBetweenGraphemeBreakType(prevGraphemeBreakType, graphemeBreakType)) {
break;
}
offset -= (prevCodePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
graphemeBreakType = prevGraphemeBreakType;
}
return [offset, endOffset];
}
export function getCharContainingOffset(str: string, offset: number): [number, number] {
if (offset > 0 && isLowSurrogate(str.charCodeAt(offset))) {
return _getCharContainingOffset(str, offset - 1);
}
return _getCharContainingOffset(str, offset);
}
/**
* A manual encoding of `str` to UTF8.
* Use only in environments which do not offer native conversion methods!
*/
export function encodeUTF8(str: string): Uint8Array {
const strLen = str.length;
// See https://en.wikipedia.org/wiki/UTF-8
// first loop to establish needed buffer size
let neededSize = 0;
let strOffset = 0;
while (strOffset < strLen) {
const codePoint = getNextCodePoint(str, strLen, strOffset);
strOffset += (codePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
if (codePoint < 0x0080) {
neededSize += 1;
} else if (codePoint < 0x0800) {
neededSize += 2;
} else if (codePoint < 0x10000) {
neededSize += 3;
} else {
neededSize += 4;
}
}
// second loop to actually encode
const arr = new Uint8Array(neededSize);
strOffset = 0;
let arrOffset = 0;
while (strOffset < strLen) {
const codePoint = getNextCodePoint(str, strLen, strOffset);
strOffset += (codePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
if (codePoint < 0x0080) {
arr[arrOffset++] = codePoint;
} else if (codePoint < 0x0800) {
arr[arrOffset++] = 0b11000000 | ((codePoint & 0b00000000000000000000011111000000) >>> 6);
arr[arrOffset++] = 0b10000000 | ((codePoint & 0b00000000000000000000000000111111) >>> 0);
} else if (codePoint < 0x10000) {
arr[arrOffset++] = 0b11100000 | ((codePoint & 0b00000000000000001111000000000000) >>> 12);
arr[arrOffset++] = 0b10000000 | ((codePoint & 0b00000000000000000000111111000000) >>> 6);
arr[arrOffset++] = 0b10000000 | ((codePoint & 0b00000000000000000000000000111111) >>> 0);
} else {
arr[arrOffset++] = 0b11110000 | ((codePoint & 0b00000000000111000000000000000000) >>> 18);
arr[arrOffset++] = 0b10000000 | ((codePoint & 0b00000000000000111111000000000000) >>> 12);
arr[arrOffset++] = 0b10000000 | ((codePoint & 0b00000000000000000000111111000000) >>> 6);
arr[arrOffset++] = 0b10000000 | ((codePoint & 0b00000000000000000000000000111111) >>> 0);
}
}
return arr;
}
/**
* A manual decoding of a UTF8 string.
* Use only in environments which do not offer native conversion methods!
*/
export function decodeUTF8(buffer: Uint8Array): string {
// https://en.wikipedia.org/wiki/UTF-8
const len = buffer.byteLength;
const result: string[] = [];
let offset = 0;
while (offset < len) {
const v0 = buffer[offset];
let codePoint: number;
if (v0 >= 0b11110000 && offset + 3 < len) {
// 4 bytes
codePoint = (
(((buffer[offset++] & 0b00000111) << 18) >>> 0)
| (((buffer[offset++] & 0b00111111) << 12) >>> 0)
| (((buffer[offset++] & 0b00111111) << 6) >>> 0)
| (((buffer[offset++] & 0b00111111) << 0) >>> 0)
);
} else if (v0 >= 0b11100000 && offset + 2 < len) {
// 3 bytes
codePoint = (
(((buffer[offset++] & 0b00001111) << 12) >>> 0)
| (((buffer[offset++] & 0b00111111) << 6) >>> 0)
| (((buffer[offset++] & 0b00111111) << 0) >>> 0)
);
} else if (v0 >= 0b11000000 && offset + 1 < len) {
// 2 bytes
codePoint = (
(((buffer[offset++] & 0b00011111) << 6) >>> 0)
| (((buffer[offset++] & 0b00111111) << 0) >>> 0)
);
} else {
// 1 byte
codePoint = buffer[offset++];
}
if ((codePoint >= 0 && codePoint <= 0xD7FF) || (codePoint >= 0xE000 && codePoint <= 0xFFFF)) {
// Basic Multilingual Plane
result.push(String.fromCharCode(codePoint));
} else if (codePoint >= 0x010000 && codePoint <= 0x10FFFF) {
// Supplementary Planes
const uPrime = codePoint - 0x10000;
const w1 = 0xD800 + ((uPrime & 0b11111111110000000000) >>> 10);
const w2 = 0xDC00 + ((uPrime & 0b00000000001111111111) >>> 0);
result.push(String.fromCharCode(w1));
result.push(String.fromCharCode(w2));
} else {
// illegal code point
result.push(String.fromCharCode(0xFFFD));
}
}
return result.join('');
}
/**
* Generated using https://github.com/alexandrudima/unicode-utils/blob/master/generate-rtl-test.js
*/
const CONTAINS_RTL = /(?:[\u05BE\u05C0\u05C3\u05C6\u05D0-\u05F4\u0608\u060B\u060D\u061B-\u064A\u066D-\u066F\u0671-\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u0710\u0712-\u072F\u074D-\u07A5\u07B1-\u07EA\u07F4\u07F5\u07FA-\u0815\u081A\u0824\u0828\u0830-\u0858\u085E-\u08BD\u200F\uFB1D\uFB1F-\uFB28\uFB2A-\uFD3D\uFD50-\uFDFC\uFE70-\uFEFC]|\uD802[\uDC00-\uDD1B\uDD20-\uDE00\uDE10-\uDE33\uDE40-\uDEE4\uDEEB-\uDF35\uDF40-\uDFFF]|\uD803[\uDC00-\uDCFF]|\uD83A[\uDC00-\uDCCF\uDD00-\uDD43\uDD50-\uDFFF]|\uD83B[\uDC00-\uDEBB])/;
/**
* Returns true if `str` contains any Unicode character that is classified as "R" or "AL".
*/
export function containsRTL(str: string): boolean {
return CONTAINS_RTL.test(str);
}
/**
* Generated using https://github.com/alexandrudima/unicode-utils/blob/master/generate-emoji-test.js
*/
const CONTAINS_EMOJI = /(?:[\u231A\u231B\u23F0\u23F3\u2600-\u27BF\u2B50\u2B55]|\uD83C[\uDDE6-\uDDFF\uDF00-\uDFFF]|\uD83D[\uDC00-\uDE4F\uDE80-\uDEFC\uDFE0-\uDFEB]|\uD83E[\uDD00-\uDDFF\uDE70-\uDE73\uDE78-\uDE82\uDE90-\uDE95])/;
export function containsEmoji(str: string): boolean {
return CONTAINS_EMOJI.test(str);
}
const IS_BASIC_ASCII = /^[\t\n\r\x20-\x7E]*$/;
/**
* Returns true if `str` contains only basic ASCII characters in the range 32 - 126 (including 32 and 126) or \n, \r, \t
*/
export function isBasicASCII(str: string): boolean {
return IS_BASIC_ASCII.test(str);
}
export function containsFullWidthCharacter(str: string): boolean {
for (let i = 0, len = str.length; i < len; i++) {
if (isFullWidthCharacter(str.charCodeAt(i))) {
return true;
}
}
return false;
}
export function isFullWidthCharacter(charCode: number): boolean {
// Do a cheap trick to better support wrapping of wide characters, treat them as 2 columns
// http://jrgraphix.net/research/unicode_blocks.php
// 2E80 — 2EFF CJK Radicals Supplement
// 2F00 — 2FDF Kangxi Radicals
// 2FF0 — 2FFF Ideographic Description Characters
// 3000 — 303F CJK Symbols and Punctuation
// 3040 — 309F Hiragana
// 30A0 — 30FF Katakana
// 3100 — 312F Bopomofo
// 3130 — 318F Hangul Compatibility Jamo
// 3190 — 319F Kanbun
// 31A0 — 31BF Bopomofo Extended
// 31F0 — 31FF Katakana Phonetic Extensions
// 3200 — 32FF Enclosed CJK Letters and Months
// 3300 — 33FF CJK Compatibility
// 3400 — 4DBF CJK Unified Ideographs Extension A
// 4DC0 — 4DFF Yijing Hexagram Symbols
// 4E00 — 9FFF CJK Unified Ideographs
// A000 — A48F Yi Syllables
// A490 — A4CF Yi Radicals
// AC00 — D7AF Hangul Syllables
// [IGNORE] D800 — DB7F High Surrogates
// [IGNORE] DB80 — DBFF High Private Use Surrogates
// [IGNORE] DC00 — DFFF Low Surrogates
// [IGNORE] E000 — F8FF Private Use Area
// F900 — FAFF CJK Compatibility Ideographs
// [IGNORE] FB00 — FB4F Alphabetic Presentation Forms
// [IGNORE] FB50 — FDFF Arabic Presentation Forms-A
// [IGNORE] FE00 — FE0F Variation Selectors
// [IGNORE] FE20 — FE2F Combining Half Marks
// [IGNORE] FE30 — FE4F CJK Compatibility Forms
// [IGNORE] FE50 — FE6F Small Form Variants
// [IGNORE] FE70 — FEFF Arabic Presentation Forms-B
// FF00 — FFEF Halfwidth and Fullwidth Forms
// [https://en.wikipedia.org/wiki/Halfwidth_and_fullwidth_forms]
// of which FF01 - FF5E fullwidth ASCII of 21 to 7E
// [IGNORE] and FF65 - FFDC halfwidth of Katakana and Hangul
// [IGNORE] FFF0 — FFFF Specials
charCode = +charCode; // @perf
return (
(charCode >= 0x2E80 && charCode <= 0xD7AF)
|| (charCode >= 0xF900 && charCode <= 0xFAFF)
|| (charCode >= 0xFF01 && charCode <= 0xFF5E)
);
}
/**
* A fast function (therefore imprecise) to check if code points are emojis.
* Generated using https://github.com/alexandrudima/unicode-utils/blob/master/generate-emoji-test.js
*/
export function isEmojiImprecise(x: number): boolean {
return (
(x >= 0x1F1E6 && x <= 0x1F1FF) || (x >= 9728 && x <= 10175) || (x >= 127744 && x <= 128591)
|| (x >= 128640 && x <= 128764) || (x >= 128992 && x <= 129003) || (x >= 129280 && x <= 129535)
|| (x >= 129648 && x <= 129651) || (x >= 129656 && x <= 129666) || (x >= 129680 && x <= 129685)
);
}
/**
* Given a string and a max length returns a shorted version. Shorting
* happens at favorable positions - such as whitespace or punctuation characters.
*/
export function lcut(text: string, n: number) {
if (text.length < n) {
return text;
}
const re = /\b/g;
let i = 0;
while (re.test(text)) {
if (text.length - re.lastIndex < n) {
break;
}
i = re.lastIndex;
re.lastIndex += 1;
}
return text.substring(i).replace(/^\s/, '');
}
// Escape codes
// http://en.wikipedia.org/wiki/ANSI_escape_code
const EL = /\x1B\x5B[12]?K/g; // Erase in line
const COLOR_START = /\x1b\[\d+m/g; // Color
const COLOR_END = /\x1b\[0?m/g; // Color
export function removeAnsiEscapeCodes(str: string): string {
if (str) {
str = str.replace(EL, '');
str = str.replace(COLOR_START, '');
str = str.replace(COLOR_END, '');
}
return str;
}
// -- UTF-8 BOM
export const UTF8_BOM_CHARACTER = String.fromCharCode(CharCode.UTF8_BOM);
export function startsWithUTF8BOM(str: string): boolean {
return !!(str && str.length > 0 && str.charCodeAt(0) === CharCode.UTF8_BOM);
}
export function stripUTF8BOM(str: string): string {
return startsWithUTF8BOM(str) ? str.substr(1) : str;
}
export function safeBtoa(str: string): string {
return btoa(encodeURIComponent(str)); // we use encodeURIComponent because btoa fails for non Latin 1 values
}
/**
* @deprecated ES6
*/
export function repeat(s: string, count: number): string {
let result = '';
for (let i = 0; i < count; i++) {
result += s;
}
return result;
}
/**
* Checks if the characters of the provided query string are included in the
* target string. The characters do not have to be contiguous within the string.
*/
export function fuzzyContains(target: string, query: string): boolean {
if (!target || !query) {
return false; // return early if target or query are undefined
}
if (target.length < query.length) {
return false; // impossible for query to be contained in target
}
const queryLen = query.length;
const targetLower = target.toLowerCase();
let index = 0;
let lastIndexOf = -1;
while (index < queryLen) {
const indexOf = targetLower.indexOf(query[index], lastIndexOf + 1);
if (indexOf < 0) {
return false;
}
lastIndexOf = indexOf;
index++;
}
return true;
}
export function containsUppercaseCharacter(target: string, ignoreEscapedChars = false): boolean {
if (!target) {
return false;
}
if (ignoreEscapedChars) {
target = target.replace(/\\./g, '');
}
return target.toLowerCase() !== target;
}
export function uppercaseFirstLetter(str: string): string {
return str.charAt(0).toUpperCase() + str.slice(1);
}
export function getNLines(str: string, n = 1): string {
if (n === 0) {
return '';
}
let idx = -1;
do {
idx = str.indexOf('\n', idx + 1);
n--;
} while (n > 0 && idx >= 0);
return idx >= 0 ?
str.substr(0, idx) :
str;
}
/**
* Produces 'a'-'z', followed by 'A'-'Z'... followed by 'a'-'z', etc.
*/
export function singleLetterHash(n: number): string {
const LETTERS_CNT = (CharCode.Z - CharCode.A + 1);
n = n % (2 * LETTERS_CNT);
if (n < LETTERS_CNT) {
return String.fromCharCode(CharCode.a + n);
}
return String.fromCharCode(CharCode.A + n - LETTERS_CNT);
}
//#region Unicode Grapheme Break
export function getGraphemeBreakType(codePoint: number): GraphemeBreakType {
const graphemeBreakTree = GraphemeBreakTree.getInstance();
return graphemeBreakTree.getGraphemeBreakType(codePoint);
}
export function breakBetweenGraphemeBreakType(breakTypeA: GraphemeBreakType, breakTypeB: GraphemeBreakType): boolean {
// http://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundary_Rules
// !!! Let's make the common case a bit faster
if (breakTypeA === GraphemeBreakType.Other) {
// see https://www.unicode.org/Public/13.0.0/ucd/auxiliary/GraphemeBreakTest-13.0.0d10.html#table
return (breakTypeB !== GraphemeBreakType.Extend && breakTypeB !== GraphemeBreakType.SpacingMark);
}
// Do not break between a CR and LF. Otherwise, break before and after controls.
// GB3 CR × LF
// GB4 (Control | CR | LF) ÷
// GB5 ÷ (Control | CR | LF)
if (breakTypeA === GraphemeBreakType.CR) {
if (breakTypeB === GraphemeBreakType.LF) {
return false; // GB3
}
}
if (breakTypeA === GraphemeBreakType.Control || breakTypeA === GraphemeBreakType.CR || breakTypeA === GraphemeBreakType.LF) {
return true; // GB4
}
if (breakTypeB === GraphemeBreakType.Control || breakTypeB === GraphemeBreakType.CR || breakTypeB === GraphemeBreakType.LF) {
return true; // GB5
}
// Do not break Hangul syllable sequences.
// GB6 L × (L | V | LV | LVT)
// GB7 (LV | V) × (V | T)
// GB8 (LVT | T) × T
if (breakTypeA === GraphemeBreakType.L) {
if (breakTypeB === GraphemeBreakType.L || breakTypeB === GraphemeBreakType.V || breakTypeB === GraphemeBreakType.LV || breakTypeB === GraphemeBreakType.LVT) {
return false; // GB6
}
}
if (breakTypeA === GraphemeBreakType.LV || breakTypeA === GraphemeBreakType.V) {
if (breakTypeB === GraphemeBreakType.V || breakTypeB === GraphemeBreakType.T) {
return false; // GB7
}
}
if (breakTypeA === GraphemeBreakType.LVT || breakTypeA === GraphemeBreakType.T) {
if (breakTypeB === GraphemeBreakType.T) {
return false; // GB8
}
}
// Do not break before extending characters or ZWJ.
// GB9 × (Extend | ZWJ)
if (breakTypeB === GraphemeBreakType.Extend || breakTypeB === GraphemeBreakType.ZWJ) {
return false; // GB9
}
// The GB9a and GB9b rules only apply to extended grapheme clusters:
// Do not break before SpacingMarks, or after Prepend characters.
// GB9a × SpacingMark
// GB9b Prepend ×
if (breakTypeB === GraphemeBreakType.SpacingMark) {
return false; // GB9a
}
if (breakTypeA === GraphemeBreakType.Prepend) {
return false; // GB9b
}
// Do not break within emoji modifier sequences or emoji zwj sequences.
// GB11 \p{Extended_Pictographic} Extend* ZWJ × \p{Extended_Pictographic}
if (breakTypeA === GraphemeBreakType.ZWJ && breakTypeB === GraphemeBreakType.Extended_Pictographic) {
// Note: we are not implementing the rule entirely here to avoid introducing states
return false; // GB11
}
// GB12 sot (RI RI)* RI × RI
// GB13 [^RI] (RI RI)* RI × RI
if (breakTypeA === GraphemeBreakType.Regional_Indicator && breakTypeB === GraphemeBreakType.Regional_Indicator) {
// Note: we are not implementing the rule entirely here to avoid introducing states
return false; // GB12 & GB13
}
// GB999 Any ÷ Any
return true;
}
export const enum GraphemeBreakType {
Other = 0,
Prepend = 1,
CR = 2,
LF = 3,
Control = 4,
Extend = 5,
Regional_Indicator = 6,
SpacingMark = 7,
L = 8,
V = 9,
T = 10,
LV = 11,
LVT = 12,
ZWJ = 13,
Extended_Pictographic = 14
}
class GraphemeBreakTree {
private static _INSTANCE: GraphemeBreakTree | null = null;
public static getInstance(): GraphemeBreakTree {
if (!GraphemeBreakTree._INSTANCE) {
GraphemeBreakTree._INSTANCE = new GraphemeBreakTree();
}
return GraphemeBreakTree._INSTANCE;
}
private readonly _data: number[];
constructor() {
this._data = getGraphemeBreakRawData();
}
public getGraphemeBreakType(codePoint: number): GraphemeBreakType {
// !!! Let's make 7bit ASCII a bit faster: 0..31
if (codePoint < 32) {
if (codePoint === CharCode.LineFeed) {
return GraphemeBreakType.LF;
}
if (codePoint === CharCode.CarriageReturn) {
return GraphemeBreakType.CR;
}
return GraphemeBreakType.Control;
}
// !!! Let's make 7bit ASCII a bit faster: 32..126
if (codePoint < 127) {
return GraphemeBreakType.Other;
}
const data = this._data;
const nodeCount = data.length / 3;
let nodeIndex = 1;
while (nodeIndex <= nodeCount) {
if (codePoint < data[3 * nodeIndex]) {
// go left
nodeIndex = 2 * nodeIndex;
} else if (codePoint > data[3 * nodeIndex + 1]) {
// go right
nodeIndex = 2 * nodeIndex + 1;
} else {
// hit
return data[3 * nodeIndex + 2];
}
}
return GraphemeBreakType.Other;
}
}
function getGraphemeBreakRawData(): number[] {
// generated using https://github.com/alexandrudima/unicode-utils/blob/master/generate-grapheme-break.js
return 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}
//#endregion