subject-path.ts
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subject-path.ts
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	import clone from "clone";

	export type SubjectPathEquiv = string[] \| string \| SubjectPath;

	export default class SubjectPath {
	elements: string[] = [];
	constructor(subject_path: SubjectPathEquiv) {
	if (subject_path instanceof SubjectPath) {
	this.fromPath(subject_path);
	} else if (typeof subject_path === "string") {
	this.fromString(subject_path);
	} else if (subject_path instanceof Array) {
	this.fromArray(subject_path);
	}
	}

	fromString(path: string) {
	this.elements = path.split(".");
	}

	fromArray(path: string[]) {
	this.elements = clone(path);
	}

	fromPath(path: SubjectPath) {
	this.elements = clone(path.elements);
	}

	clone() {
	const cloned_elements = clone(this.elements);
	return new SubjectPath(cloned_elements);
	}

	tail() {
	return new SubjectPath(this.elements.slice(1));
	}

	head() {
	return this.elements[0];
	}
	}