strings.ts

/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import { LRUCachedFunction } from './cache.js';
import { CharCode } from './charCode.js';
import { Lazy } from './lazy.js';
import { Constants } from './uint.js';

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 {
	if (Object.keys(values).length === 0) {
		return template;
	}
	return template.replace(_format2Regexp, (match, group) => (values[group] ?? match) as string);
}

/**
 * Encodes the given value so that it can be used as literal value in html attributes.
 *
 * In other words, computes `$val`, such that `attr` in `<div attr="$val" />` has the runtime value `value`.
 * This prevents XSS injection.
 */
export function htmlAttributeEncodeValue(value: string): string {
	return value.replace(/[<>"'&]/g, ch => {
		switch (ch) {
			case '<': return '&lt;';
			case '>': return '&gt;';
			case '"': return '&quot;';
			case '\'': return '&apos;';
			case '&': return '&amp;';
		}
		return ch;
	});
}

/**
 * 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, '\\$&');
}

/**
 * Counts how often `substr` occurs inside `value`.
 */
export function count(value: string, substr: string): number {
	let result = 0;
	let index = value.indexOf(substr);
	while (index !== -1) {
		result++;
		index = value.indexOf(substr, index + substr.length);
	}
	return result;
}

export function truncate(value: string, maxLength: number, suffix = '…'): string {
	if (value.length <= maxLength) {
		return value;
	}

	return `${value.substr(0, maxLength)}${suffix}`;
}

export function truncateMiddle(value: string, maxLength: number, suffix = '…'): string {
	if (value.length <= maxLength) {
		return value;
	}

	const prefixLength = Math.ceil(maxLength / 2) - suffix.length / 2;
	const suffixLength = Math.floor(maxLength / 2) - suffix.length / 2;

	return `${value.substr(0, prefixLength)}${suffix}${value.substr(value.length - suffixLength)}`;
}

/**
 * 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 splitLines(str: string): string[] {
	return str.split(/\r\n|\r|\n/);
}

export function splitLinesIncludeSeparators(str: string): string[] {
	const linesWithSeparators: string[] = [];
	const splitLinesAndSeparators = str.split(/(\r\n|\r|\n)/);
	for (let i = 0; i < Math.ceil(splitLinesAndSeparators.length / 2); i++) {
		linesWithSeparators.push(splitLinesAndSeparators[2 * i] + (splitLinesAndSeparators[2 * i + 1] ?? ''));
	}
	return linesWithSeparators;
}

/**
 * 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 getIndentationLength(str: string): number {
	const idx = firstNonWhitespaceIndex(str);
	if (idx === -1) { return str.length; }
	return idx;
}

/**
 * Function that works identically to String.prototype.replace, except, the
 * replace function is allowed to be async and return a Promise.
 */
export function replaceAsync(str: string, search: RegExp, replacer: (match: string, ...args: any[]) => Promise<string>): Promise<string> {
	const parts: (string | Promise<string>)[] = [];

	let last = 0;
	for (const match of str.matchAll(search)) {
		parts.push(str.slice(last, match.index));
		if (match.index === undefined) {
			throw new Error('match.index should be defined');
		}

		last = match.index + match[0].length;
		parts.push(replacer(match[0], ...match.slice(1), match.index, str, match.groups));
	}

	parts.push(str.slice(last));

	return Promise.all(parts).then(p => p.join(''));
}

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++) {
		const codeA = a.charCodeAt(aStart);
		const 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 isAsciiDigit(code: number): boolean {
	return code >= CharCode.Digit0 && code <= CharCode.Digit9;
}

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 {

	const len = Math.min(a.length, b.length);
	let i: number;

	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 {

	const len = Math.min(a.length, b.length);
	let i: number;

	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];
}

export function charCount(str: string): number {
	const iterator = new GraphemeIterator(str);
	let length = 0;
	while (!iterator.eol()) {
		length++;
		iterator.nextGraphemeLength();
	}
	return length;
}

let CONTAINS_RTL: RegExp | undefined = undefined;

function makeContainsRtl() {
	// Generated using https://github.com/alexdima/unicode-utils/blob/main/rtl-test.js
	return /(?:[\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 {
	if (!CONTAINS_RTL) {
		CONTAINS_RTL = makeContainsRtl();
	}

	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.
 * The return value can be longer than the given value of `n`. Leading whitespace is always trimmed.
 */
export function lcut(text: string, n: number, prefix = '') {
	const trimmed = text.trimStart();

	if (trimmed.length < n) {
		return trimmed;
	}

	const re = /\b/g;
	let i = 0;
	while (re.test(trimmed)) {
		if (trimmed.length - re.lastIndex < n) {
			break;
		}

		i = re.lastIndex;
		re.lastIndex += 1;
	}

	if (i === 0) {
		return trimmed;
	}

	return prefix + trimmed.substring(i).trimStart();
}

// Escape codes, compiled from https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Functions-using-CSI-_-ordered-by-the-final-character_s_
// Plus additional markers for custom `\x1b]...\x07` instructions.
const CSI_SEQUENCE = /(?:(?:\x1b\[|\x9B)[=?>!]?[\d;:]*["$#'* ]?[a-zA-Z@^`{}|~])|(:?\x1b\].*?\x07)/g;

/** Iterates over parts of a string with CSI sequences */
export function* forAnsiStringParts(str: string) {
	let last = 0;
	for (const match of str.matchAll(CSI_SEQUENCE)) {
		if (last !== match.index) {
			yield { isCode: false, str: str.substring(last, match.index) };
		}

		yield { isCode: true, str: match[0] };
		last = match.index + match[0].length;
	}

	if (last !== str.length) {
		yield { isCode: false, str: str.substring(last) };
	}
}

/**
 * Strips ANSI escape sequences from a string.
 * @param str The dastringa stringo strip the ANSI escape sequences from.
 *
 * @example
 * removeAnsiEscapeCodes('\u001b[31mHello, World!\u001b[0m');
 * // 'Hello, World!'
 */
export function removeAnsiEscapeCodes(str: string): string {
	if (str) {
		str = str.replace(CSI_SEQUENCE, '');
	}

	return str;
}

const PROMPT_NON_PRINTABLE = /\\\[.*?\\\]/g;

/**
 * Strips ANSI escape sequences from a UNIX-style prompt string (eg. `$PS1`).
 * @param str The string to strip the ANSI escape sequences from.
 *
 * @example
 * removeAnsiEscapeCodesFromPrompt('\n\\[\u001b[01;34m\\]\\w\\[\u001b[00m\\]\n\\[\u001b[1;32m\\]> \\[\u001b[0m\\]');
 * // '\n\\w\n> '
 */
export function removeAnsiEscapeCodesFromPrompt(str: string): string {
	return removeAnsiEscapeCodes(str).replace(PROMPT_NON_PRINTABLE, '');
}


// -- 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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,11,47028,47028,11,47056,47056,11,47084,47084,11,47112,47112,11,47140,47140,11,47168,47168,11,47196,47196,11,47224,47224,11,47252,47252,11,47280,47280,11,47308,47308,11,47336,47336,11,47364,47364,11,47392,47392,11,47420,47420,11,47448,47448,11,47476,47476,11,47504,47504,11,47532,47532,11,47560,47560,11,47588,47588,11,47616,47616,11,47644,47644,11,47672,47672,11,47700,47700,11,47728,47728,11,47756,47756,11,47784,47784,11,47812,47812,11,47840,47840,11,47868,47868,11,47896,47896,11,47924,47924,11,47952,47952,11,47980,47980,11,48008,48008,11,48036,48036,11,48064,48064,11,48092,48092,11,48120,48120,11,48148,48148,11,48176,48176,11,48204,48204,11,48232,48232,11,48260,48260,11,48288,48288,11,48316,48316,11,48344,48344,11,48372,48372,11,48400,48400,11,48428,48428,11,48456,48456,11,48484,48484,11,48512,48512,11,48540,48540,11,48568,48568,11,48596,48596,11,48624,48624,11,48652,48652,11,48680,48680,11,48708,48708,11,48736,48736,11,48764,48764,11,48792,48792,11,48820,48820,11,48848,48848,11,48876,48876,11,48904,48904,11,48932,48932,11,48960,48960,11,48988,48988,11,49016,49016,11,49044,49044,11,49072,49072,11,49100,49100,11,49128,49128,11,49156,49156,11,49184,49184,11,49212,49212,11,49240,49240,11,49268,49268,11,49296,49296,11,49324,49324,11,49352,49352,11,49380,49380,11,49408,49408,11,49436,49436,11,49464,49464,11,49492,49492,11,49520,49520,11,49548,49548,11,49576,49576,11,49604,49604,11,49632,49632,11,49660,49660,11,49688,49688,11,49716,49716,11,49744,49744,11,49772,49772,11,49800,49800,11,49828,49828,11,49856,49856,11,49884,49884,11,49912,49912,11,49940,49940,11,49968,49968,11,49996,49996,11,50024,50024,11,50052,50052,11,50080,50080,11,50108,50108,11,50136,50136,11,50164,50164,11,50192,50192,11,50220,50220,11,50248,50248,11,50276,50276,11,50304,50304,11,50332,50332,11,50360,50360,11,50388,50388,11,50416,50416,11,50444,50444,11,50472,50472,11,50500,50500,11,50528,50528,11,50556,50556,11,50584,50584,11,50612,50612,11,50640,50640,11,50668,50668,11,50696,50696,11,50724,50724,11,50752,50752,11,50780,50780,11,50808,50808,11,50836,50836,11,50864,50864,11,50892,50892,11,50920,50920,11,50948,50948,11,50976,50976,11,51004,51004,11,51032,51032,11,51060,51060,11,51088,51088,11,51116,51116,11,51144,51144,11,51172,51172,11,51200,51200,11,51228,51228,11,51256,51256,11,51284,51284,11,51312,51312,11,51340,51340,11,51368,51368,11,51396,51396,11,51424,51424,11,51452,51452,11,51480,51480,11,51508,51508,11,51536,51536,11,51564,51564,11,51592,51592,11,51620,51620,11,51648,51648,11,51676,51676,11,51704,51704,11,51732,51732,11,51760,51760,11,51788,51788,11,51816,51816,11,51844,51844,11,51872,51872,11,51900,51900,11,51928,51928,11,51956,51956,11,51984,51984,11,52012,52012,11,52040,52040,11,52068,52068,11,52096,52096,11,52124,52124,11,52152,52152,11,52180,52180,11,52208,52208,11,52236,52236,11,52264,52264,11,52292,52292,11,52320,52320,11,52348,52348,11,52376,52376,11,52404,52404,11,52432,52432,11,52460,52460,11,52488,52488,11,52516,52516,11,52544,52544,11,52572,52572,11,52600,52600,11,52628,52628,11,52656,52656,11,52684,52684,11,52712,52712,11,52740,52740,11,52768,52768,11,52796,52796,11,52824,52824,11,52852,52852,11,52880,52880,11,52908,52908,11,52936,52936,11,52964,52964,11,52992,52992,11,53020,53020,11,53048,53048,11,53076,53076,11,53104,53104,11,53132,53132,11,53160,53160,11,53188,53188,11,53216,53216,11,53244,53244,11,53272,53272,11,53300,53300,11,53328,53328,11,53356,53356,11,53384,53384,11,53412,53412,11,53440,53440,11,53468,53468,11,53496,53496,11,53524,53524,11,53552,53552,11,53580,53580,11,53608,53608,11,53636,53636,11,53664,53664,11,53692,53692,11,53720,53720,11,53748,53748,11,53776,53776,11,53804,53804,11,53832,53832,11,53860,53860,11,53888,53888,11,53916,53916,11,53944,53944,11,53972,53972,11,54000,54000,11,54028,54028,11,54056,54056,11,54084,54084,11,54112,54112,11,54140,54140,11,54168,54168,11,54196,54196,11,54224,54224,11,54252,54252,11,54280,54280,11,54308,54308,11,54336,54336,11,54364,54364,11,54392,54392,11,54420,54420,11,54448,54448,11,54476,54476,11,54504,54504,11,54532,54532,11,54560,54560,11,54588,54588,11,54616,54616,11,54644,54644,11,54672,54672,11,54700,54700,11,54728,54728,11,54756,54756,11,54784,54784,11,54812,54812,11,54840,54840,11,54868,54868,11,54896,54896,11,54924,54924,11,54952,54952,11,54980,54980,11,55008,55008,11,55036,55036,11,55064,55064,11,55092,55092,11,55120,55120,11,55148,55148,11,55176,55176,11,55216,55238,9,64286,64286,5,65056,65071,5,65438,65439,5,65529,65531,4,66272,66272,5,68097,68099,5,68108,68111,5,68159,68159,5,68900,68903,5,69446,69456,5,69632,69632,7,69634,69634,7,69744,69744,5,69759,69761,5,69808,69810,7,69815,69816,7,69821,69821,1,69837,69837,1,69927,69931,5,69933,69940,5,70003,70003,5,70018,70018,7,70070,70078,5,70082,70083,1,70094,70094,7,70188,70190,7,70194,70195,7,70197,70197,7,70206,70206,5,70368,70370,7,70400,70401,5,70459,70460,5,70463,70463,7,70465,70468,7,70475,70477,7,70498,70499,7,70512,70516,5,70712,70719,5,70722,70724,5,70726,70726,5,70832,70832,5,70835,70840,5,70842,70842,5,70845,70845,5,70847,70848,5,70850,70851,5,71088,71089,7,71096,71099,7,71102,71102,7,71132,71133,5,71219,71226,5,71229,71229,5,71231,71232,5,71340,71340,7,71342,71343,7,71350,71350,7,71453,71455,5,71462,71462,7,71724,71726,7,71736,71736,7,71984,71984,5,71991,71992,7,71997,71997,7,71999,71999,1,72001,72001,1,72003,72003,5,72148,72151,5,72156,72159,7,72164,72164,7,72243,72248,5,72250,72250,1,72263,72263,5,72279,72280,7,72324,72329,1,72343,72343,7,72751,72751,7,72760,72765,5,72767,72767,5,72873,72873,7,72881,72881,7,72884,72884,7,73009,73014,5,73020,73021,5,73030,73030,1,73098,73102,7,73107,73108,7,73110,73110,7,73459,73460,5,78896,78904,4,92976,92982,5,94033,94087,7,94180,94180,5,113821,113822,5,118528,118573,5,119141,119141,5,119143,119145,5,119150,119154,5,119163,119170,5,119210,119213,5,121344,121398,5,121461,121461,5,121499,121503,5,122880,122886,5,122907,122913,5,122918,122922,5,123566,123566,5,125136,125142,5,126976,126979,14,126981,127182,14,127184,127231,14,127279,127279,14,127344,127345,14,127374,127374,14,127405,127461,14,127489,127490,14,127514,127514,14,127538,127546,14,127561,127567,14,127570,127743,14,127757,127758,14,127760,127760,14,127762,127762,14,127766,127768,14,127770,127770,14,127772,127772,14,127775,127776,14,127778,127779,14,127789,127791,14,127794,127795,14,127798,127798,14,127819,127819,14,127824,127824,14,127868,127868,14,127870,127871,14,127892,127893,14,127896,127896,14,127900,127901,14,127904,127940,14,127942,127942,14,127944,127944,14,127946,127946,14,127951,127955,14,127968,127971,14,127973,127984,14,127987,127987,14,127989,127989,14,127991,127991,14,127995,127999,5,128008,128008,14,128012,128014,14,128017,128018,14,128020,128020,14,128022,128022,14,128042,128042,14,128063,128063,14,128065,128065,14,128101,128101,14,128108,128109,14,128173,128173,14,128182,128183,14,128236,128237,14,128239,128239,14,128245,128245,14,128248,128248,14,128253,128253,14,128255,128258,14,128260,128263,14,128265,128265,14,128277,128277,14,128300,128301,14,128326,128328,14,128331,128334,14,128336,128347,14,128360,128366,14,128369,128370,14,128378,128378,14,128391,128391,14,128394,128397,14,128400,128400,14,128405,128406,14,128420,128420,14,128422,128423,14,128425,128432,14,128435,128443,14,128445,128449,14,128453,128464,14,128468,128475,14,128479,128480,14,128482,128482,14,128484,128487,14,128489,128494,14,128496,128498,14,128500,128505,14,128507,128511,14,128513,128518,14,128521,128525,14,128527,128527,14,128529,128529,14,128533,128533,14,128535,128535,14,128537,128537,14]');
}

//#endregion

/**
 * Computes the offset after performing a left delete on the given string,
 * while considering unicode grapheme/emoji rules.
*/
export function getLeftDeleteOffset(offset: number, str: string): number {
	if (offset === 0) {
		return 0;
	}

	// Try to delete emoji part.
	const emojiOffset = getOffsetBeforeLastEmojiComponent(offset, str);
	if (emojiOffset !== undefined) {
		return emojiOffset;
	}

	// Otherwise, just skip a single code point.
	const iterator = new CodePointIterator(str, offset);
	iterator.prevCodePoint();
	return iterator.offset;
}

function getOffsetBeforeLastEmojiComponent(initialOffset: number, str: string): number | undefined {
	// See https://www.unicode.org/reports/tr51/tr51-14.html#EBNF_and_Regex for the
	// structure of emojis.
	const iterator = new CodePointIterator(str, initialOffset);
	let codePoint = iterator.prevCodePoint();

	// Skip modifiers
	while ((isEmojiModifier(codePoint) || codePoint === CodePoint.emojiVariantSelector || codePoint === CodePoint.enclosingKeyCap)) {
		if (iterator.offset === 0) {
			// Cannot skip modifier, no preceding emoji base.
			return undefined;
		}
		codePoint = iterator.prevCodePoint();
	}

	// Expect base emoji
	if (!isEmojiImprecise(codePoint)) {
		// Unexpected code point, not a valid emoji.
		return undefined;
	}

	let resultOffset = iterator.offset;

	if (resultOffset > 0) {
		// Skip optional ZWJ code points that combine multiple emojis.
		// In theory, we should check if that ZWJ actually combines multiple emojis
		// to prevent deleting ZWJs in situations we didn't account for.
		const optionalZwjCodePoint = iterator.prevCodePoint();
		if (optionalZwjCodePoint === CodePoint.zwj) {
			resultOffset = iterator.offset;
		}
	}

	return resultOffset;
}

function isEmojiModifier(codePoint: number): boolean {
	return 0x1F3FB <= codePoint && codePoint <= 0x1F3FF;
}

const enum CodePoint {
	zwj = 0x200D,

	/**
	 * Variation Selector-16 (VS16)
	*/
	emojiVariantSelector = 0xFE0F,

	/**
	 * Combining Enclosing Keycap
	 */
	enclosingKeyCap = 0x20E3,
}

export const noBreakWhitespace = '\xa0';

export class AmbiguousCharacters {
	private static readonly ambiguousCharacterData = new Lazy<
		Record<
			string | '_common' | '_default',
			/* code point -> ascii code point */ number[]
		>
	>(() => {
		// Generated using https://github.com/hediet/vscode-unicode-data
		// Stored as key1, value1, key2, value2, ...
		return JSON.parse(
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		);
	});

	private static readonly cache = new LRUCachedFunction<
		string[],
		AmbiguousCharacters
	>({ getCacheKey: JSON.stringify }, (locales) => {
		function arrayToMap(arr: number[]): Map<number, number> {
			const result = new Map<number, number>();
			for (let i = 0; i < arr.length; i += 2) {
				result.set(arr[i], arr[i + 1]);
			}
			return result;
		}

		function mergeMaps(
			map1: Map<number, number>,
			map2: Map<number, number>
		): Map<number, number> {
			const result = new Map<number, number>(map1);
			for (const [key, value] of map2) {
				result.set(key, value);
			}
			return result;
		}

		function intersectMaps(
			map1: Map<number, number> | undefined,
			map2: Map<number, number>
		) {
			if (!map1) {
				return map2;
			}
			const result = new Map<number, number>();
			for (const [key, value] of map1) {
				if (map2.has(key)) {
					result.set(key, value);
				}
			}
			return result;
		}

		const data = this.ambiguousCharacterData.value;

		let filteredLocales = locales.filter(
			(l) => !l.startsWith('_') && l in data
		);
		if (filteredLocales.length === 0) {
			filteredLocales = ['_default'];
		}

		let languageSpecificMap: Map<number, number> | undefined = undefined;
		for (const locale of filteredLocales) {
			const map = arrayToMap(data[locale]);
			languageSpecificMap = intersectMaps(languageSpecificMap, map);
		}

		const commonMap = arrayToMap(data['_common']);
		const map = mergeMaps(commonMap, languageSpecificMap!);

		return new AmbiguousCharacters(map);
	});

	public static getInstance(locales: Set<string>): AmbiguousCharacters {
		return AmbiguousCharacters.cache.get(Array.from(locales));
	}

	private static _locales = new Lazy<string[]>(() =>
		Object.keys(AmbiguousCharacters.ambiguousCharacterData.value).filter(
			(k) => !k.startsWith('_')
		)
	);
	public static getLocales(): string[] {
		return AmbiguousCharacters._locales.value;
	}

	private constructor(
		private readonly confusableDictionary: Map<number, number>
	) { }

	public isAmbiguous(codePoint: number): boolean {
		return this.confusableDictionary.has(codePoint);
	}

	public containsAmbiguousCharacter(str: string): boolean {
		for (let i = 0; i < str.length; i++) {
			const codePoint = str.codePointAt(i);
			if (typeof codePoint === 'number' && this.isAmbiguous(codePoint)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Returns the non basic ASCII code point that the given code point can be confused,
	 * or undefined if such code point does note exist.
	 */
	public getPrimaryConfusable(codePoint: number): number | undefined {
		return this.confusableDictionary.get(codePoint);
	}

	public getConfusableCodePoints(): ReadonlySet<number> {
		return new Set(this.confusableDictionary.keys());
	}
}

export class InvisibleCharacters {
	private static getRawData(): number[] {
		// Generated using https://github.com/hediet/vscode-unicode-data
		return JSON.parse('[9,10,11,12,13,32,127,160,173,847,1564,4447,4448,6068,6069,6155,6156,6157,6158,7355,7356,8192,8193,8194,8195,8196,8197,8198,8199,8200,8201,8202,8203,8204,8205,8206,8207,8234,8235,8236,8237,8238,8239,8287,8288,8289,8290,8291,8292,8293,8294,8295,8296,8297,8298,8299,8300,8301,8302,8303,10240,12288,12644,65024,65025,65026,65027,65028,65029,65030,65031,65032,65033,65034,65035,65036,65037,65038,65039,65279,65440,65520,65521,65522,65523,65524,65525,65526,65527,65528,65532,78844,119155,119156,119157,119158,119159,119160,119161,119162,917504,917505,917506,917507,917508,917509,917510,917511,917512,917513,917514,917515,917516,917517,917518,917519,917520,917521,917522,917523,917524,917525,917526,917527,917528,917529,917530,917531,917532,917533,917534,917535,917536,917537,917538,917539,917540,917541,917542,917543,917544,917545,917546,917547,917548,917549,917550,917551,917552,917553,917554,917555,917556,917557,917558,917559,917560,917561,917562,917563,917564,917565,917566,917567,917568,917569,917570,917571,917572,917573,917574,917575,917576,917577,917578,917579,917580,917581,917582,917583,917584,917585,917586,917587,917588,917589,917590,917591,917592,917593,917594,917595,917596,917597,917598,917599,917600,917601,917602,917603,917604,917605,917606,917607,917608,917609,917610,917611,917612,917613,917614,917615,917616,917617,917618,917619,917620,917621,917622,917623,917624,917625,917626,917627,917628,917629,917630,917631,917760,917761,917762,917763,917764,917765,917766,917767,917768,917769,917770,917771,917772,917773,917774,917775,917776,917777,917778,917779,917780,917781,917782,917783,917784,917785,917786,917787,917788,917789,917790,917791,917792,917793,917794,917795,917796,917797,917798,917799,917800,917801,917802,917803,917804,917805,917806,917807,917808,917809,917810,917811,917812,917813,917814,917815,917816,917817,917818,917819,917820,917821,917822,917823,917824,917825,917826,917827,917828,917829,917830,917831,917832,917833,917834,917835,917836,917837,917838,917839,917840,917841,917842,917843,917844,917845,917846,917847,917848,917849,917850,917851,917852,917853,917854,917855,917856,917857,917858,917859,917860,917861,917862,917863,917864,917865,917866,917867,917868,917869,917870,917871,917872,917873,917874,917875,917876,917877,917878,917879,917880,917881,917882,917883,917884,917885,917886,917887,917888,917889,917890,917891,917892,917893,917894,917895,917896,917897,917898,917899,917900,917901,917902,917903,917904,917905,917906,917907,917908,917909,917910,917911,917912,917913,917914,917915,917916,917917,917918,917919,917920,917921,917922,917923,917924,917925,917926,917927,917928,917929,917930,917931,917932,917933,917934,917935,917936,917937,917938,917939,917940,917941,917942,917943,917944,917945,917946,917947,917948,917949,917950,917951,917952,917953,917954,917955,917956,917957,917958,917959,917960,917961,917962,917963,917964,917965,917966,917967,917968,917969,917970,917971,917972,917973,917974,917975,917976,917977,917978,917979,917980,917981,917982,917983,917984,917985,917986,917987,917988,917989,917990,917991,917992,917993,917994,917995,917996,917997,917998,917999]');
	}

	private static _data: Set<number> | undefined = undefined;

	private static getData() {
		if (!this._data) {
			this._data = new Set(InvisibleCharacters.getRawData());
		}
		return this._data;
	}

	public static isInvisibleCharacter(codePoint: number): boolean {
		return InvisibleCharacters.getData().has(codePoint);
	}

	public static containsInvisibleCharacter(str: string): boolean {
		for (let i = 0; i < str.length; i++) {
			const codePoint = str.codePointAt(i);
			if (typeof codePoint === 'number' && InvisibleCharacters.isInvisibleCharacter(codePoint)) {
				return true;
			}
		}
		return false;

	}

	public static get codePoints(): ReadonlySet<number> {
		return InvisibleCharacters.getData();
	}
}