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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/** @fileoverview Utility functions to help use prefs in Polymer controls. */
// TODO(michaelpg): converge with other WebUI on capitalization. This is
// consistent with Settings, but WebUI uses lower.underscore_case.
cr.define('Settings.PrefUtil', function() {
/**
* Converts a string value to a type corresponding to the given preference.
* @param {string} value
* @param {!chrome.settingsPrivate.PrefObject} pref
* @return {boolean|number|string|undefined}
*/
function stringToPrefValue(value, pref) {
switch (pref.type) {
case chrome.settingsPrivate.PrefType.BOOLEAN:
return value == 'true';
case chrome.settingsPrivate.PrefType.NUMBER:
var n = parseInt(value, 10);
if (isNaN(n)) {
console.error('Argument to stringToPrefValue for number pref ' +
'was unparsable: ' + value);
return undefined;
}
return n;
case chrome.settingsPrivate.PrefType.STRING:
case chrome.settingsPrivate.PrefType.URL:
return value;
default:
assertNotReached('No conversion from string to ' + pref.type + ' pref');
}
}
/**
* Returns the value of the pref as a string.
* @param {!chrome.settingsPrivate.PrefObject} pref
* @return {string}
*/
function prefToString(pref) {
switch (pref.type) {
case chrome.settingsPrivate.PrefType.BOOLEAN:
case chrome.settingsPrivate.PrefType.NUMBER:
return pref.value.toString();
case chrome.settingsPrivate.PrefType.STRING:
case chrome.settingsPrivate.PrefType.URL:
return /** @type {string} */(pref.value);
default:
assertNotReached('No conversion from ' + pref.type + ' pref to string');
}
}
return {
stringToPrefValue: stringToPrefValue,
prefToString: prefToString,
};
});
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