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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
/*
* Helper functions extract values from manifest members
* and reports conformance violations.
*/
/*globals Components*/
'use strict';
const {
classes: Cc,
interfaces: Ci
} = Components;
function ValueExtractor(aConsole, aBundle) {
this.console = aConsole;
this.domBundle = aBundle;
}
ValueExtractor.prototype = {
// This function takes a 'spec' object and destructures
// it to extract a value. If the value is of th wrong type, it
// warns the developer and returns undefined.
// expectType: is the type of a JS primitive (string, number, etc.)
// object: is the object from which to extract the value.
// objectName: string used to construct the developer warning.
// property: the name of the property being extracted.
// trim: boolean, if the value should be trimmed (used by string type).
extractValue({expectedType, object, objectName, property, trim}) {
const value = object[property];
const isArray = Array.isArray(value);
// We need to special-case "array", as it's not a JS primitive.
const type = (isArray) ? 'array' : typeof value;
if (type !== expectedType) {
if (type !== 'undefined') {
this.console.warn(this.domBundle.formatStringFromName("ManifestInvalidType",
[objectName, property, expectedType],
3));
}
return undefined;
}
// Trim string and returned undefined if the empty string.
const shouldTrim = expectedType === 'string' && value && trim;
if (shouldTrim) {
return value.trim() || undefined;
}
return value;
},
extractColorValue(spec) {
const value = this.extractValue(spec);
const DOMUtils = Cc['@mozilla.org/inspector/dom-utils;1']
.getService(Ci.inIDOMUtils);
let color;
if (DOMUtils.isValidCSSColor(value)) {
color = value;
} else if (value) {
this.console.warn(this.domBundle.formatStringFromName("ManifestInvalidCSSColor",
[spec.property, value],
2));
}
return color;
}
};
this.ValueExtractor = ValueExtractor; // jshint ignore:line
this.EXPORTED_SYMBOLS = ['ValueExtractor']; // jshint ignore:line
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