File size: 3,771 Bytes
f8b5d42 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | const UPPERCASE = /[\p{Lu}]/u;
const LOWERCASE = /[\p{Ll}]/u;
const LEADING_CAPITAL = /^[\p{Lu}](?![\p{Lu}])/gu;
const IDENTIFIER = /([\p{Alpha}\p{N}_]|$)/u;
const SEPARATORS = /[_.\- ]+/;
const LEADING_SEPARATORS = new RegExp("^" + SEPARATORS.source);
const SEPARATORS_AND_IDENTIFIER = new RegExp(
SEPARATORS.source + IDENTIFIER.source,
"gu"
);
const NUMBERS_AND_IDENTIFIER = new RegExp("\\d+" + IDENTIFIER.source, "gu");
const preserveCamelCase = (
string,
toLowerCase,
toUpperCase,
preserveConsecutiveUppercase
) => {
let isLastCharLower = false;
let isLastCharUpper = false;
let isLastLastCharUpper = false;
let isLastLastCharPreserved = false;
for (let index = 0; index < string.length; index++) {
const character = string[index];
isLastLastCharPreserved = index > 2 ? string[index - 3] === "-" : true;
if (isLastCharLower && UPPERCASE.test(character)) {
string = string.slice(0, index) + "-" + string.slice(index);
isLastCharLower = false;
isLastLastCharUpper = isLastCharUpper;
isLastCharUpper = true;
index++;
} else if (
isLastCharUpper &&
isLastLastCharUpper &&
LOWERCASE.test(character) &&
(!isLastLastCharPreserved || preserveConsecutiveUppercase)
) {
string = string.slice(0, index - 1) + "-" + string.slice(index - 1);
isLastLastCharUpper = isLastCharUpper;
isLastCharUpper = false;
isLastCharLower = true;
} else {
isLastCharLower =
toLowerCase(character) === character &&
toUpperCase(character) !== character;
isLastLastCharUpper = isLastCharUpper;
isLastCharUpper =
toUpperCase(character) === character &&
toLowerCase(character) !== character;
}
}
return string;
};
const preserveConsecutiveUppercase = (input, toLowerCase) => {
LEADING_CAPITAL.lastIndex = 0;
return input.replace(LEADING_CAPITAL, (m1) => toLowerCase(m1));
};
const postProcess = (input, toUpperCase) => {
SEPARATORS_AND_IDENTIFIER.lastIndex = 0;
NUMBERS_AND_IDENTIFIER.lastIndex = 0;
return input
.replace(SEPARATORS_AND_IDENTIFIER, (_, identifier) =>
toUpperCase(identifier)
)
.replace(NUMBERS_AND_IDENTIFIER, (m) => toUpperCase(m));
};
function camelCase(input, options) {
if (!(typeof input === "string" || Array.isArray(input))) {
throw new TypeError("Expected the input to be `string | string[]`");
}
options = {
pascalCase: true,
preserveConsecutiveUppercase: false,
...options,
};
if (Array.isArray(input)) {
input = input
.map((x) => x.trim())
.filter((x) => x.length)
.join("-");
} else {
input = input.trim();
}
if (input.length === 0) {
return "";
}
const toLowerCase =
options.locale === false
? (string) => string.toLowerCase()
: (string) => string.toLocaleLowerCase(options.locale);
const toUpperCase =
options.locale === false
? (string) => string.toUpperCase()
: (string) => string.toLocaleUpperCase(options.locale);
if (input.length === 1) {
if (SEPARATORS.test(input)) {
return "";
}
return options.pascalCase ? toUpperCase(input) : toLowerCase(input);
}
const hasUpperCase = input !== toLowerCase(input);
if (hasUpperCase) {
input = preserveCamelCase(
input,
toLowerCase,
toUpperCase,
options.preserveConsecutiveUppercase
);
}
input = input.replace(LEADING_SEPARATORS, "");
input = options.preserveConsecutiveUppercase
? preserveConsecutiveUppercase(input, toLowerCase)
: toLowerCase(input);
if (options.pascalCase) {
input = toUpperCase(input.charAt(0)) + input.slice(1);
}
return postProcess(input, toUpperCase);
}
module.exports = {
camelCase,
};
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