@pkerschbaum/code-oss-file-service
Version:
VS Code ([microsoft/vscode](https://github.com/microsoft/vscode)) includes a rich "`FileService`" and "`DiskFileSystemProvider`" abstraction built on top of Node.js core modules (`fs`, `path`) and Electron's `shell` module. This package allows to use that
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text/typescript
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { LRUCachedComputed } from 'vs/base/common/cache';
import { CharCode } from 'vs/base/common/charCode';
import { Lazy } from 'vs/base/common/lazy';
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;
}
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];
});
}
const _format2Regexp = /{([^}]+)}/g;
/**
* Helper to create a string from a template and a string record.
* Similar to `format` but with objects instead of positional arguments.
*/
export function format2(template: string, values: Record<string, unknown>): string {
return template.replace(_format2Regexp, (match, group) => (values[group] ?? match) as string);
}
/**
* 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 '<';
case '>': return '>';
case '&': return '&';
default: return match;
}
});
}
/**
* Escapes regular expression characters in a given string
*/
export function escapeRegExpCharacters(value: string): string {
return value.replace(/[\\\{\}\*\+\?\|\^\$\.\[\]\(\)]/g, '\\$&');
}
/**
* Counts how often `character` occurs inside `value`.
*/
export function count(value: string, character: string): number {
let result = 0;
const ch = character.charCodeAt(0);
for (let i = value.length - 1; i >= 0; i--) {
if (value.charCodeAt(i) === ch) {
result++;
}
}
return result;
}
export function truncate(value: string, maxLength: number, suffix = '…'): string {
if (value.length <= maxLength) {
return value;
}
return `${value.substr(0, maxLength)}${suffix}`;
}
/**
* 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, '');
}
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' : '');
}
export function splitLines(str: string): string[] {
return str.split(/\r\n|\r|\n/);
}
/**
* 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;
}
if (codeA >= 128 || codeB >= 128) {
// not ASCII letters -> fallback to lower-casing strings
return compareSubstring(a.toLowerCase(), b.toLowerCase(), aStart, aEnd, bStart, bEnd);
}
// mapper lower-case ascii letter onto upper-case varinats
// [97-122] (lower ascii) --> [65-90] (upper ascii)
if (isLowerAsciiLetter(codeA)) {
codeA -= 32;
}
if (isLowerAsciiLetter(codeB)) {
codeB -= 32;
}
// compare both code points
const diff = codeA - codeB;
if (diff === 0) {
continue;
}
return diff;
}
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;
}
export function equalsIgnoreCase(a: string, b: string): boolean {
return a.length === b.length && compareSubstringIgnoreCase(a, b) === 0;
}
export function startsWithIgnoreCase(str: string, candidate: string): boolean {
const candidateLength = candidate.length;
if (candidate.length > str.length) {
return false;
}
return compareSubstringIgnoreCase(str, candidate, 0, candidateLength) === 0;
}
/**
* @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 class CodePointIterator {
private readonly _str: string;
private readonly _len: number;
private _offset: number;
public get offset(): number {
return this._offset;
}
constructor(str: string, offset: number = 0) {
this._str = str;
this._len = str.length;
this._offset = offset;
}
public setOffset(offset: number): void {
this._offset = offset;
}
public prevCodePoint(): number {
const codePoint = getPrevCodePoint(this._str, this._offset);
this._offset -= (codePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
return codePoint;
}
public nextCodePoint(): number {
const codePoint = getNextCodePoint(this._str, this._len, this._offset);
this._offset += (codePoint >= Constants.UNICODE_SUPPLEMENTARY_PLANE_BEGIN ? 2 : 1);
return codePoint;
}
public eol(): boolean {
return (this._offset >= this._len);
}
}
export class GraphemeIterator {
private readonly _iterator: CodePointIterator;
public get offset(): number {
return this._iterator.offset;
}
constructor(str: string, offset: number = 0) {
this._iterator = new CodePointIterator(str, offset);
}
public nextGraphemeLength(): number {
const graphemeBreakTree = GraphemeBreakTree.getInstance();
const iterator = this._iterator;
const initialOffset = iterator.offset;
let graphemeBreakType = graphemeBreakTree.getGraphemeBreakType(iterator.nextCodePoint());
while (!iterator.eol()) {
const offset = iterator.offset;
const nextGraphemeBreakType = graphemeBreakTree.getGraphemeBreakType(iterator.nextCodePoint());
if (breakBetweenGraphemeBreakType(graphemeBreakType, nextGraphemeBreakType)) {
// move iterator back
iterator.setOffset(offset);
break;
}
graphemeBreakType = nextGraphemeBreakType;
}
return (iterator.offset - initialOffset);
}
public prevGraphemeLength(): number {
const graphemeBreakTree = GraphemeBreakTree.getInstance();
const iterator = this._iterator;
const initialOffset = iterator.offset;
let graphemeBreakType = graphemeBreakTree.getGraphemeBreakType(iterator.prevCodePoint());
while (iterator.offset > 0) {
const offset = iterator.offset;
const prevGraphemeBreakType = graphemeBreakTree.getGraphemeBreakType(iterator.prevCodePoint());
if (breakBetweenGraphemeBreakType(prevGraphemeBreakType, graphemeBreakType)) {
// move iterator back
iterator.setOffset(offset);
break;
}
graphemeBreakType = prevGraphemeBreakType;
}
return (initialOffset - iterator.offset);
}
public eol(): boolean {
return this._iterator.eol();
}
}
export function nextCharLength(str: string, initialOffset: number): number {
const iterator = new GraphemeIterator(str, initialOffset);
return iterator.nextGraphemeLength();
}
export function prevCharLength(str: string, initialOffset: number): number {
const iterator = new GraphemeIterator(str, initialOffset);
return iterator.prevGraphemeLength();
}
export function getCharContainingOffset(str: string, offset: number): [number, number] {
if (offset > 0 && isLowSurrogate(str.charCodeAt(offset))) {
offset--;
}
const endOffset = offset + nextCharLength(str, offset);
const startOffset = endOffset - prevCharLength(str, endOffset);
return [startOffset, endOffset];
}
/**
* Generated using https://github.com/alexdima/unicode-utils/blob/main/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\u07FE-\u0815\u081A\u0824\u0828\u0830-\u0858\u085E-\u088E\u08A0-\u08C9\u200F\uFB1D\uFB1F-\uFB28\uFB2A-\uFD3D\uFD50-\uFDC7\uFDF0-\uFDFC\uFE70-\uFEFC]|\uD802[\uDC00-\uDD1B\uDD20-\uDE00\uDE10-\uDE35\uDE40-\uDEE4\uDEEB-\uDF35\uDF40-\uDFFF]|\uD803[\uDC00-\uDD23\uDE80-\uDEA9\uDEAD-\uDF45\uDF51-\uDF81\uDF86-\uDFF6]|\uD83A[\uDC00-\uDCCF\uDD00-\uDD43\uDD4B-\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);
}
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 const UNUSUAL_LINE_TERMINATORS = /[\u2028\u2029]/; // LINE SEPARATOR (LS) or PARAGRAPH SEPARATOR (PS)
/**
* Returns true if `str` contains unusual line terminators, like LS or PS
*/
export function containsUnusualLineTerminators(str: string): boolean {
return UNUSUAL_LINE_TERMINATORS.test(str);
}
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
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/alexdima/unicode-utils/blob/main/emoji-test.js
*/
export function isEmojiImprecise(x: number): boolean {
return (
(x >= 0x1F1E6 && x <= 0x1F1FF) || (x === 8986) || (x === 8987) || (x === 9200)
|| (x === 9203) || (x >= 9728 && x <= 10175) || (x === 11088) || (x === 11093)
|| (x >= 127744 && x <= 128591) || (x >= 128640 && x <= 128764)
|| (x >= 128992 && x <= 129008) || (x >= 129280 && x <= 129535)
|| (x >= 129648 && x <= 129782)
);
}
/**
* 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;
}
/**
* 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);
if (idx === -1) {
return str;
}
if (str[idx - 1] === '\r') {
idx--;
}
return str.substr(0, idx);
}
/**
* 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);
}
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/alexdima/unicode-utils/blob/main/grapheme-break.js
return 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