101 lines
No EOL
1.9 KiB
JavaScript
101 lines
No EOL
1.9 KiB
JavaScript
/*
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* @copyright 2015- commenthol
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* @license MIT
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*/
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'use strict';
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var utils = require('./utils');
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var KEY = /^[a-zA-Z$_][a-zA-Z$_0-9]*$/;
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/**
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* handle references
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* @constructor
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* @param {Object} references
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* @param {boolean} opts.unsafe
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*/
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function Ref(references, opts) {
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this.keys = [];
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this.refs = [];
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this.key = [];
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this.references = references || [];
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this._opts = opts || {};
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}
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/**
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* wrap an object key
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* @api private
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* @param {String} key - objects key
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* @return {String} wrapped key in quotes if necessary
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*/
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Ref.wrapkey = function (key, opts) {
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return KEY.test(key) ? key : utils.quote(key, opts);
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};
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Ref.prototype = {
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/**
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* push `key` to interal array
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* @param {String} key
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*/
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push: function push(key) {
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this.key.push(key);
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},
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/**
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* remove the last key from internal array
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*/
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pop: function pop() {
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this.key.pop();
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},
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/**
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* join the keys
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*/
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join: function join(key) {
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var _this = this;
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var out = '';
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key = key || this.key;
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if (typeof key === 'string') {
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key = [key];
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}
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key.forEach(function (k) {
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if (KEY.test(k)) {
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out += '.' + k;
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} else {
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out += '[' + Ref.wrapkey(k, _this._opts) + ']';
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}
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});
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return out;
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},
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/**
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* check if object `source` has an already known reference.
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* If so then origin and source are stored in `opts.reference`
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* @param {Object} source - object to compare
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* @return {Boolean}
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*/
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hasReference: function hasReference(source) {
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var idx;
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if (~(idx = this.refs.indexOf(source))) {
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this.references.push([this.join(), this.keys[idx]]);
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return true;
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} else {
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this.refs.push(source);
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this.keys.push(this.join());
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}
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},
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/**
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* get the references array
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* @return {Array} references array
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*/
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getReferences: function getReferences() {
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return this.references;
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}
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};
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module.exports = Ref; |