eewing
71 lines
2.0 KiB
JavaScript
71 lines
2.0 KiB
JavaScript
const NUMBER_CHAR_RE = /\d/;
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const STR_SPLITTERS = ["-", "_", "/", "."];
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function isUppercase(char = "") {
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if (NUMBER_CHAR_RE.test(char))
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return undefined;
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return char !== char.toLowerCase();
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}
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function splitByCase(str) {
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const parts = [];
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let buff = "";
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let previousUpper;
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let previousSplitter;
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for (const char of str) {
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// Splitter
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const isSplitter = STR_SPLITTERS.includes(char);
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if (isSplitter === true) {
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parts.push(buff);
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buff = "";
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previousUpper = undefined;
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continue;
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}
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const isUpper = isUppercase(char);
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if (previousSplitter === false) {
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// Case rising edge
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if (previousUpper === false && isUpper === true) {
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parts.push(buff);
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buff = char;
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previousUpper = isUpper;
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continue;
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}
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// Case falling edge
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if (previousUpper === true && isUpper === false && buff.length > 1) {
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const lastChar = buff.at(-1);
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parts.push(buff.slice(0, Math.max(0, buff.length - 1)));
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buff = lastChar + char;
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previousUpper = isUpper;
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continue;
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}
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}
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// Normal char
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buff += char;
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previousUpper = isUpper;
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previousSplitter = isSplitter;
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}
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parts.push(buff);
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return parts;
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}
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export function pascalCase(str) {
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if (!str)
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return "";
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return splitByCase(str)
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.map((p) => upperFirst(p))
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.join("");
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}
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export function camelCase(str) {
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return lowerFirst(pascalCase(str || ""));
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}
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export function kebabCase(str) {
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return str
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? splitByCase(str)
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.map((p) => p.toLowerCase())
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.join("-")
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: "";
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}
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function upperFirst(str) {
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return str ? str[0].toUpperCase() + str.slice(1) : "";
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}
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function lowerFirst(str) {
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return str ? str[0].toLowerCase() + str.slice(1) : "";
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}
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