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util.js
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'use strict';
let semver = require('semver');
let exceptions = require('./exceptions');
class Util {
static convertObjectKeysToUnderscores(obj) {
let newObj = {};
for (let key in obj) {
if (!obj.hasOwnProperty(key)) {
continue;
}
let value = obj[key];
let newKey = Util.toUnderscore(key);
if (value instanceof Array) {
newObj[newKey] =
value.map((item) => typeof item === 'object' ? Util.convertObjectKeysToUnderscores(item) : item)
;
} else if (typeof value === 'object') {
if (value instanceof Date || value === null) {
newObj[newKey] = value;
} else {
newObj[newKey] = Util.convertObjectKeysToUnderscores(value);
}
} else {
newObj[newKey] = value;
}
}
return newObj;
}
static convertNodeToObject(obj) {
if (typeof obj === 'object' && obj['@']) {
if (obj['@'].type === 'array') {
let newArray = [];
for (let key in obj) {
if (!obj.hasOwnProperty(key)) {
continue;
}
let value = obj[key];
if (key !== '@') {
if (value instanceof Array) {
for (let item of value) {
newArray.push(this.convertNodeToObject(item));
}
} else {
newArray.push(this.convertNodeToObject(value));
}
}
}
return newArray;
} else if (obj['@'].type === 'collection') {
let newObj = {};
for (let key in obj) {
if (!obj.hasOwnProperty(key)) {
continue;
}
let value = obj[key];
if (key !== '@') {
newObj[this.toCamelCase(key)] = this.convertNodeToObject(value);
}
}
return newObj;
} else if (obj['@'].nil === 'true') {
return null;
} else if (obj['@'].type === 'integer') {
return parseInt(obj['#'], 10);
} else if (obj['@'].type === 'boolean') {
return obj['#'] === 'true';
}
return obj['#'];
} else if (obj instanceof Array) {
return obj.map((item) => this.convertNodeToObject(item));
} else if (typeof obj === 'object' && this.objectIsEmpty(obj)) {
return '';
} else if (typeof obj === 'object') {
let newObj = {};
for (let key in obj) {
if (!obj.hasOwnProperty(key)) {
continue;
}
let value = obj[key];
newObj[this.toCamelCase(key)] = this.convertNodeToObject(value);
}
return newObj;
}
return obj;
}
static objectIsEmpty(obj) {
for (let key in obj) { // eslint-disable-line no-unused-vars
if (!obj.hasOwnProperty(key)) {
continue;
}
return false;
}
return true;
}
static arrayIsEmpty(array) {
if (!(array instanceof Array)) { return false; }
if (array.length > 0) { return false; }
return true;
}
static toCamelCase(string) {
return string.replace(/([\-\_][a-z0-9])/g, match => match.toUpperCase().replace('-', '').replace('_', ''));
}
static toUnderscore(string) {
return string.replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2').replace(/([a-z])([A-Z])/g, '$1_$2').toLowerCase();
}
static flatten(array) {
while (this._containsArray(array)) {
array = array.reduce((first, rest) => {
first = first instanceof Array ? first : [first];
rest = rest instanceof Array ? this.flatten(rest) : rest;
return first.concat(rest);
}
);
}
return array;
}
static merge(obj1, obj2) {
for (let key in obj2) {
if (!obj2.hasOwnProperty(key)) {
continue;
}
let value = obj2[key];
obj1[key] = value;
}
return obj1;
}
static without(array1, array2) {
let newArray = [];
for (let value of array1) {
if (!this._containsValue(array2, value)) { newArray.push(value); }
}
return newArray;
}
static supportsStreams2() {
return semver.satisfies(process.version, '>=0.10');
}
static flattenKeys(obj, prefix) {
let keys = [];
for (let key in obj) {
if (!obj.hasOwnProperty(key)) {
continue;
}
let value = obj[key];
if (typeof value === 'object') {
let keyToPush = prefix ? prefix + '[' + key + ']' : key;
keys.push(Util.flattenKeys(value, keyToPush));
} else if (prefix) {
keys.push(prefix + '[' + key + ']');
} else {
keys.push(key);
}
}
return this.flatten(keys);
}
static verifyKeys(keys, obj) { // eslint-disable-line consistent-return
let invalidKeys;
let unrecognizedKeys = this.without(this.flattenKeys(obj), keys.valid);
if (keys.ignore) {
invalidKeys = unrecognizedKeys.filter(function (key) {
for (let ignoredKey of keys.ignore) {
if (key.indexOf(ignoredKey) === 0) { return false; }
}
return true;
});
} else {
invalidKeys = unrecognizedKeys;
}
if (invalidKeys.length > 0) {
return exceptions.InvalidKeysError(`These keys are invalid: ${invalidKeys.join(', ')}`); // eslint-disable-line new-cap
}
}
static _containsValue(array, element) {
return array.indexOf(element) !== -1;
}
static _containsArray(array) {
for (let element of array) {
if (element instanceof Array) {
return true;
}
}
return false;
}
}
module.exports = {Util: Util};