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// Copyright 2014 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.
/**
* Get the |key| attribute in the given |dict| and verify that it is an
* array value.
*
* If the attribute is not an array, then an exception will be thrown unless
* a default value is specified in |opt_default|.
*
* @param {Object.<string,*>} dict The dictionary containing the |key|
* @param {string} key The key to typecheck in the |dict|.
* @param {Array=} opt_default The value to return if the key is not a bool.
* @return {Array} The |key| attribute value as an object.
*/
function getArrayAttr(dict, key, opt_default) {
var value = /** @type {Array} */ (dict[key]);
if (!(value instanceof Array)) {
if (opt_default === undefined) {
throw 'Invalid data type for ' + key +
' (expected: array, actual: ' + typeof value + ')';
} else {
return opt_default;
}
}
return value;
}
/**
* Get the |key| attribute in the given |dict| and verify that it is a
* boolean value.
*
* If the attribute is not a boolean, then an exception will be thrown unless
* a default value is specified in |opt_default|.
*
* @param {Object.<string,*>} dict The dictionary containing the |key|
* @param {string} key The key to typecheck in the |dict|.
* @param {boolean=} opt_default The value to return if the key is not a bool.
* @return {boolean} The |key| attribute value as a boolean.
*/
function getBooleanAttr(dict, key, opt_default) {
var value = /** @type {boolean} */ (dict[key]);
if (typeof value != 'boolean') {
if (opt_default === undefined) {
throw 'Invalid data type for ' + key +
' (expected: boolean, actual: ' + typeof value + ')';
} else {
return opt_default;
}
}
return value;
}
/**
* Get the |key| attribute in the given |dict| and verify that it is a
* number value.
*
* If the attribute is not a number, then an exception will be thrown unless
* a default value is specified in |opt_default|.
*
* @param {Object.<string,*>} dict The dictionary containing the |key|
* @param {string} key The key to typecheck in the |dict|.
* @param {number=} opt_default The value to return if the key is not a number.
* @return {number} The |key| attribute value as a number.
*/
function getNumberAttr(dict, key, opt_default) {
var value = /** @type {number} */(dict[key]);
if (typeof value != 'number') {
if (opt_default === undefined) {
throw 'Invalid data type for ' + key +
' (expected: number, actual: ' + typeof value + ')';
} else {
return opt_default;
}
}
return value;
}
/**
* Get the |key| attribute in the given |dict| and verify that it is an
* object value.
*
* If the attribute is not an object, then an exception will be thrown unless
* a default value is specified in |opt_default|.
*
* @param {Object.<string,*>} dict The dictionary containing the |key|
* @param {string} key The key to typecheck in the |dict|.
* @param {Object=} opt_default The value to return if the key is not a bool.
* @return {Object} The |key| attribute value as an object.
*/
function getObjectAttr(dict, key, opt_default) {
var value = /** @type {Object} */ (dict[key]);
if (typeof value != 'object') {
if (opt_default === undefined) {
throw 'Invalid data type for ' + key +
' (expected: object, actual: ' + typeof value + ')';
} else {
return opt_default;
}
}
return value;
}
/**
* Get the |key| attribute in the given |dict| and verify that it is a
* string value.
*
* If the attribute is not a string, then an exception will be thrown unless
* a default value is specified in |opt_default|.
*
* @param {Object.<string,*>} dict The dictionary containing the |key|
* @param {string} key The key to typecheck in the |dict|.
* @param {string=} opt_default The value to return if the key is not a string.
* @return {string} The |key| attribute value as a string.
*/
function getStringAttr(dict, key, opt_default) {
var value = /** @type {string} */ (dict[key]);
if (typeof value != 'string') {
if (opt_default === undefined) {
throw 'Invalid data type for ' + key +
' (expected: string, actual: ' + typeof value + ')';
} else {
return opt_default;
}
}
return value;
}
/**
* Return a JSON object parsed from a string.
*
* If the string cannot be parsed, or does not result in an object, then an
* exception will be thrown.
*
* @param {string} jsonString The JSON string to parse.
* @return {Object} The JSON object created from the |jsonString|.
*/
function getJsonObjectFromString(jsonString) {
var value = /** @type {Object} */ JSON.parse(jsonString);
if (typeof value != 'object') {
throw 'Invalid data type (expected: Object, actual: ' + typeof value + ')';
}
return value;
}
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