container_array_match.js

'use strict';

var Registry = require('../registry');

/*
 * containerArrayMatch: does this attribute string point into a
 * layout container array?
 *
 * @param {String} astr: an attribute string, like *annotations[2].text*
 *
 * @returns {Object | false} Returns false if `astr` doesn't match a container
 * array. If it does, returns:
 * {array: {String}, index: {Number}, property: {String}}
 * ie the attribute string for the array, the index within the array (or ''
 * if the whole array) and the property within that (or '' if the whole array
 * or the whole object)
 */
module.exports = function containerArrayMatch(astr) {
 var rootContainers = Registry.layoutArrayContainers;
 var regexpContainers = Registry.layoutArrayRegexes;
 var rootPart = astr.split('[')[0];
 var arrayStr;
 var match;

 // look for regexp matches first, because they may be nested inside root matches
 // eg updatemenus[i].buttons is nested inside updatemenus
 for(var i = 0; i < regexpContainers.length; i++) {
 match = astr.match(regexpContainers[i]);
 if(match && match.index === 0) {
 arrayStr = match[0];
 break;
 }
 }

 // now look for root matches
 if(!arrayStr) arrayStr = rootContainers[rootContainers.indexOf(rootPart)];

 if(!arrayStr) return false;

 var tail = astr.slice(arrayStr.length);
 if(!tail) return {array: arrayStr, index: '', property: ''};

 match = tail.match(/^\[(0|[1-9][0-9]*)\](\.(.+))?$/);
 if(!match) return false;

 return {array: arrayStr, index: Number(match[1]), property: match[3] || ''};
};