subject-path.js
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subject-path.js
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	"use strict";

	const clone = require("clone");

	const SubjectPath = function(subject_path) {
	if (SubjectPath instanceof SubjectPath) {
	return SubjectPath;
	}

	this.elements = [];
	this.subject_type_instance = null;

	this._init(subject_path);
	};
	SubjectPath.prototype._init = function(subject_path) {
	this._load_path_elements(subject_path);
	};
	SubjectPath.prototype._load_path_elements = function(subject_path) {
	if (subject_path instanceof SubjectPath) {
	this._from_path(subject_path);
	} else if (typeof subject_path === "string") {
	this._from_string(subject_path);
	} else if (subject_path instanceof Array) {
	this._from_array(subject_path);
	}
	};
	SubjectPath.prototype._from_string = function(description_string) {
	this.elements = description_string.split(".");
	};
	SubjectPath.prototype._from_array = function(description_array) {
	this.elements = clone(description_array);
	};
	SubjectPath.prototype._from_path = function(subject) {
	this.elements = clone(subject.elements);
	};
	SubjectPath.prototype.clone = function() {
	const cloned_elements = clone(this.elements);
	return new SubjectPath(cloned_elements);
	};
	SubjectPath.prototype.tail = function() {
	return new SubjectPath(this.elements.slice(1));
	};
	SubjectPath.prototype.head = function() {
	return this.elements[0];
	};

	module.exports = SubjectPath;