runes2/dist/index.umd.production.min.cjs.map

Unicode-aware JS string splitting, typescript version

{"version":3,"file":"index.umd.production.min.cjs","sources":["../src/index.ts"],"sourcesContent":["export const enum EnumRunesCode\r\n{\r\n\tHIGH_SURROGATE_START = 0xd800,\r\n\tHIGH_SURROGATE_END = 0xdbff,\r\n\r\n\tLOW_SURROGATE_START = 0xdc00,\r\n\r\n\tREGIONAL_INDICATOR_START = 0x1f1e6,\r\n\tREGIONAL_INDICATOR_END = 0x1f1ff,\r\n\r\n\tFITZPATRICK_MODIFIER_START = 0x1f3fb,\r\n\tFITZPATRICK_MODIFIER_END = 0x1f3ff,\r\n\r\n\tVARIATION_MODIFIER_START = 0xfe00,\r\n\tVARIATION_MODIFIER_END = 0xfe0f,\r\n\r\n\tDIACRITICAL_MARKS_START = 0x20d0,\r\n\tDIACRITICAL_MARKS_END = 0x20ff,\r\n\r\n\tSUBDIVISION_INDICATOR_START = 0x1f3f4,\r\n\tTAGS_START = 0xe0000,\r\n\tTAGS_END = 0xe007f,\r\n\r\n\tZWJ = 0x200d,\r\n}\r\n\r\nexport const GRAPHEMES = Object.freeze([\r\n\t0x0308, // ( ◌̈ ) COMBINING DIAERESIS\r\n\t0x0937, // ( ष ) DEVANAGARI LETTER SSA\r\n\t0x093F, // ( ि ) DEVANAGARI VOWEL SIGN I\r\n\t0x0BA8, // ( ந ) TAMIL LETTER NA\r\n\t0x0BBF, // ( ி ) TAMIL VOWEL SIGN I\r\n\t0x0BCD, // ( ◌்) TAMIL SIGN VIRAMA\r\n\t0x0E31, // ( ◌ั ) THAI CHARACTER MAI HAN-AKAT\r\n\t0x0E33, // ( ำ ) THAI CHARACTER SARA AM\r\n\t0x0E40, // ( เ ) THAI CHARACTER SARA E\r\n\t0x0E49, // ( เ ) THAI CHARACTER MAI THO\r\n\t0x1100, // ( ᄀ ) HANGUL CHOSEONG KIYEOK\r\n\t0x1161, // ( ᅡ ) HANGUL JUNGSEONG A\r\n\t0x11A8, // ( ᆨ ) HANGUL JONGSEONG KIYEOK\r\n]);\r\n\r\nexport const enum EnumCodeUnits\r\n{\r\n\tunit_1 = 1,\r\n\tunit_2 = 2,\r\n\tunit_4 = 4,\r\n}\r\n\r\nexport function runes(string: string): string[]\r\n{\r\n\tif (typeof string !== 'string')\r\n\t{\r\n\t\tthrow new TypeError('string cannot be undefined or null')\r\n\t}\r\n\tconst result: string[] = []\r\n\tlet i = 0\r\n\tlet increment = 0\r\n\twhile (i < string.length)\r\n\t{\r\n\t\tincrement += nextUnits(i + increment, string)\r\n\t\tif (isGrapheme(string[i + increment]))\r\n\t\t{\r\n\t\t\tincrement++\r\n\t\t}\r\n\t\tif (isVariationSelector(string[i + increment]))\r\n\t\t{\r\n\t\t\tincrement++\r\n\t\t}\r\n\t\tif (isDiacriticalMark(string[i + increment]))\r\n\t\t{\r\n\t\t\tincrement++\r\n\t\t}\r\n\t\tif (isZeroWidthJoiner(string[i + increment]))\r\n\t\t{\r\n\t\t\tincrement++\r\n\t\t\tcontinue\r\n\t\t}\r\n\t\tresult.push(string.substring(i, i + increment))\r\n\t\ti += increment\r\n\t\tincrement = 0\r\n\t}\r\n\treturn result\r\n}\r\n\r\n// Decide how many code units make up the current character.\r\n// BMP characters: 1 code unit\r\n// Non-BMP characters (represented by surrogate pairs): 2 code units\r\n// Emoji with skin-tone modifiers: 4 code units (2 code points)\r\n// Country flags: 4 code units (2 code points)\r\n// Variations: 2 code units\r\n// Subdivision flags: 14 code units (7 code points)\r\nexport function nextUnits(i: number, string: string)\r\n{\r\n\tconst current = string[i]\r\n\t// If we don't have a value that is part of a surrogate pair, or we're at\r\n\t// the end, only take the value at i\r\n\tif (!isFirstOfSurrogatePair(current) || i === string.length - 1)\r\n\t{\r\n\t\treturn EnumCodeUnits.unit_1\r\n\t}\r\n\r\n\tconst currentPair = current + string[i + 1]\r\n\tlet nextPair = string.substring(i + 2, i + 5)\r\n\r\n\t// Country flags are comprised of two regional indicator symbols,\r\n\t// each represented by a surrogate pair.\r\n\t// See http://emojipedia.org/flags/\r\n\t// If both pairs are regional indicator symbols, take 4\r\n\tif (isRegionalIndicator(currentPair) && isRegionalIndicator(nextPair))\r\n\t{\r\n\t\treturn EnumCodeUnits.unit_4\r\n\t}\r\n\r\n\t// https://unicode.org/emoji/charts/full-emoji-list.html#subdivision-flag\r\n\t// See https://emojipedia.org/emoji-tag-sequence/\r\n\t// If nextPair is in Tags(https://en.wikipedia.org/wiki/Tags_(Unicode_block)),\r\n\t// then find next closest U+E007F(CANCEL TAG)\r\n\tif (isSubdivisionFlag(currentPair) &&\tisSupplementarySpecialpurposePlane(nextPair))\r\n\t{\r\n\t\treturn string.slice(i).indexOf(String.fromCodePoint(EnumRunesCode.TAGS_END)) + 2\r\n\t}\r\n\r\n\t// If the next pair make a Fitzpatrick skin tone\r\n\t// modifier, take 4\r\n\t// See http://emojipedia.org/modifiers/\r\n\t// Technically, only some code points are meant to be\r\n\t// combined with the skin tone modifiers. This function\r\n\t// does not check the current pair to see if it is\r\n\t// one of them.\r\n\tif (isFitzpatrickModifier(nextPair))\r\n\t{\r\n\t\treturn EnumCodeUnits.unit_4\r\n\t}\r\n\treturn EnumCodeUnits.unit_2\r\n}\r\n\r\nexport function isFirstOfSurrogatePair(string: string)\r\n{\r\n\treturn string && betweenInclusive(string[0].charCodeAt(0), EnumRunesCode.HIGH_SURROGATE_START, EnumRunesCode.HIGH_SURROGATE_END)\r\n}\r\n\r\nexport function isRegionalIndicator(string: string)\r\n{\r\n\treturn betweenInclusive(codePointFromSurrogatePair(string), EnumRunesCode.REGIONAL_INDICATOR_START, EnumRunesCode.REGIONAL_INDICATOR_END)\r\n}\r\n\r\nexport function isSubdivisionFlag(string: string)\r\n{\r\n\treturn betweenInclusive(codePointFromSurrogatePair(string),\tEnumRunesCode.SUBDIVISION_INDICATOR_START, EnumRunesCode.SUBDIVISION_INDICATOR_START)\r\n}\r\n\r\nexport function isFitzpatrickModifier(string: string)\r\n{\r\n\treturn betweenInclusive(codePointFromSurrogatePair(string), EnumRunesCode.FITZPATRICK_MODIFIER_START, EnumRunesCode.FITZPATRICK_MODIFIER_END)\r\n}\r\n\r\nexport function isVariationSelector(string: string)\r\n{\r\n\treturn typeof string === 'string' && betweenInclusive(string.charCodeAt(0), EnumRunesCode.VARIATION_MODIFIER_START, EnumRunesCode.VARIATION_MODIFIER_END)\r\n}\r\n\r\nexport function isDiacriticalMark(string: string)\r\n{\r\n\treturn typeof string === 'string' && betweenInclusive(string.charCodeAt(0), EnumRunesCode.DIACRITICAL_MARKS_START, EnumRunesCode.DIACRITICAL_MARKS_END)\r\n}\r\n\r\nexport function isSupplementarySpecialpurposePlane(string: string)\r\n{\r\n\tconst codePoint = string.codePointAt(0)\r\n\treturn (typeof string === 'string' &&\ttypeof codePoint === 'number' && betweenInclusive(codePoint, EnumRunesCode.TAGS_START, EnumRunesCode.TAGS_END))\r\n}\r\n\r\nexport function isGrapheme(string: string)\r\n{\r\n\treturn typeof string === 'string' && GRAPHEMES.includes(string.charCodeAt(0))\r\n}\r\n\r\nexport function isZeroWidthJoiner(string: string)\r\n{\r\n\treturn typeof string === 'string' && string.charCodeAt(0) === EnumRunesCode.ZWJ\r\n}\r\n\r\nexport function codePointFromSurrogatePair(pair: string)\r\n{\r\n\tconst highOffset = pair.charCodeAt(0) - EnumRunesCode.HIGH_SURROGATE_START\r\n\tconst lowOffset = pair.charCodeAt(1) - EnumRunesCode.LOW_SURROGATE_START\r\n\treturn (highOffset << 10) + lowOffset + 0x10000\r\n}\r\n\r\nexport function betweenInclusive(value: number, lower: number, upper: number)\r\n{\r\n\treturn value >= lower && value <= upper\r\n}\r\n\r\nexport function substring(string: string, start?: number, width?: number)\r\n{\r\n\tconst chars = runes(string)\r\n\tif (start === undefined)\r\n\t{\r\n\t\treturn string\r\n\t}\r\n\tif (start >= chars.length)\r\n\t{\r\n\t\treturn ''\r\n\t}\r\n\tconst rest = chars.length - start\r\n\tconst stringWidth = width === undefined ? 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