typia/lib/internal/_notationSnake.mjs

Superfast runtime validators with only one line

//#region src/internal/_notationSnake.ts
const _notationSnakeWord = (str) => {
	const indexes = [];
	for (let i = 0; i < str.length; i++) {
		const code = str.charCodeAt(i);
		if (65 <= code && code <= 90) indexes.push(i);
	}
	for (let i = indexes.length - 1; i > 0; --i) if (indexes[i] - indexes[i - 1] === 1) indexes.splice(i, 1);
	if (indexes.length !== 0 && indexes[0] === 0) indexes.splice(0, 1);
	if (indexes.length === 0) return str.toLowerCase();
	let ret = "";
	for (let i = 0; i < indexes.length; i++) {
		const first = i === 0 ? 0 : indexes[i - 1];
		const last = indexes[i];
		ret += str.substring(first, last).toLowerCase();
		ret += "_";
	}
	ret += str.substring(indexes[indexes.length - 1]).toLowerCase();
	return ret;
};
const _notationSnake = (str) => {
	if (str.length === 0) return str;
	let prefix = "";
	for (let i = 0; i < str.length; i++) if (str[i] === "_") prefix += "_";
	else break;
	if (prefix.length !== 0) str = str.substring(prefix.length);
	return `${prefix}${str.split("_").map(_notationSnakeWord).join("_")}`;
};
//#endregion
export { _notationSnake };

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