michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: "use strict"
michael@0: 
michael@0: this.EXPORTED_SYMBOLS = ['ActivitiesServiceFilter'];
michael@0: 
michael@0: this.ActivitiesServiceFilter = {
michael@0:   match: function(aValues, aFilters) {
michael@0: 
michael@0:     function matchValue(aValue, aFilter, aFilterObj) {
michael@0:       if (aFilter !== null) {
michael@0:         // Custom functions for the different types.
michael@0:         switch (typeof(aFilter)) {
michael@0:         case 'boolean':
michael@0:           return aValue === aFilter;
michael@0: 
michael@0:         case 'number':
michael@0:           return Number(aValue) === aFilter;
michael@0: 
michael@0:         case 'string':
michael@0:           return String(aValue) === aFilter;
michael@0: 
michael@0:         default: // not supported
michael@0:           return false;
michael@0:         }
michael@0:       }
michael@0: 
michael@0:       // Pattern.
michael@0:       if (('pattern' in aFilterObj)) {
michael@0:         var pattern = String(aFilterObj.pattern);
michael@0: 
michael@0:         var patternFlags = '';
michael@0:         if (('patternFlags' in aFilterObj)) {
michael@0:           patternFlags = String(aFilterObj.patternFlags);
michael@0:         }
michael@0: 
michael@0:         var re = new RegExp('^(?:' + pattern + ')$', patternFlags);
michael@0:         return re.test(aValue);
michael@0:       }
michael@0: 
michael@0:       // Validation of the min/Max.
michael@0:       if (('min' in aFilterObj) || ('max' in aFilterObj)) {
michael@0:         // Min value.
michael@0:         if (('min' in aFilterObj) &&
michael@0:             aFilterObj.min > aValue) {
michael@0:           return false;
michael@0:         }
michael@0: 
michael@0:         // Max value.
michael@0:         if (('max' in aFilterObj) &&
michael@0:             aFilterObj.max < aValue) {
michael@0:           return false;
michael@0:         }
michael@0:       }
michael@0: 
michael@0:       return true;
michael@0:     }
michael@0: 
michael@0:     // this function returns true if the value matches with the filter object
michael@0:     function matchObject(aValue, aFilterObj) {
michael@0: 
michael@0:       // Let's consider anything an array.
michael@0:       let filters = ('value' in aFilterObj)
michael@0:                       ? (Array.isArray(aFilterObj.value)
michael@0:                           ? aFilterObj.value
michael@0:                           : [aFilterObj.value])
michael@0:                       : [ null ];
michael@0:       let values  = Array.isArray(aValue) ? aValue : [aValue];
michael@0: 
michael@0:       for (var filterId = 0; filterId < filters.length; ++filterId) {
michael@0:         for (var valueId = 0; valueId < values.length; ++valueId) {
michael@0:           if (matchValue(values[valueId], filters[filterId], aFilterObj)) {
michael@0:             return true;
michael@0:           }
michael@0:         }
michael@0:       }
michael@0: 
michael@0:       return false;
michael@0:     }
michael@0: 
michael@0:     // Creation of a filter map useful to know what has been
michael@0:     // matched and what is not.
michael@0:     let filtersMap = {}
michael@0:     for (let filter in aFilters) {
michael@0:       // Convert this filter in an object if needed
michael@0:       let filterObj = aFilters[filter];
michael@0: 
michael@0:       if (Array.isArray(filterObj) || typeof(filterObj) !== 'object') {
michael@0:         filterObj = {
michael@0:           required: false,
michael@0:           value: filterObj
michael@0:         }
michael@0:       }
michael@0: 
michael@0:       filtersMap[filter] = { filter: filterObj,
michael@0:                              found:  false };
michael@0:     }
michael@0: 
michael@0:     // For any incoming property.
michael@0:     for (let prop in aValues) {
michael@0:       // If this is unknown for the app, let's continue.
michael@0:       if (!(prop in filtersMap)) {
michael@0:         continue;
michael@0:       }
michael@0: 
michael@0:       if (Array.isArray(aValues[prop]) && aValues[prop].length == 0) {
michael@0:         continue;
michael@0:       }
michael@0: 
michael@0:       // Otherwise, let's check the value against the filter.
michael@0:       if (!matchObject(aValues[prop], filtersMap[prop].filter)) {
michael@0:         return false;
michael@0:       }
michael@0: 
michael@0:       filtersMap[prop].found = true;
michael@0:     }
michael@0: 
michael@0:     // Required filters:
michael@0:     for (let filter in filtersMap) {
michael@0:       if (filtersMap[filter].filter.required && !filtersMap[filter].found) {
michael@0:         return false;
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     return true;
michael@0:   }
michael@0: }