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Array.js
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Array.js
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const Model = require('./Model');
let ArrayType;
function flagAsArrayType (array) {
Object.defineProperty(array, 'Model', {
enumerable: false,
configurable: false,
writable: false,
value: ArrayType
});
}
function _createModelArray (rawArray) {
// only create second array if we need to wrap data with Model instance
const newArray = new Array(rawArray.length);
flagAsArrayType(newArray);
return newArray;
}
function convertArrayItems (array, ItemType, options) {
// We might need to do some type conversion on each item in the array.
// Even if we do type conversion we store the "raw" value in the
// array and not the model instance
let newArray;
newArray = _createModelArray(array);
let wrap;
let coerce;
if (ItemType && ((wrap = ItemType.wrap) || (coerce = ItemType.coerce))) {
// we need to either wrap or coerce each item in the array
let i = array.length;
while (--i >= 0) {
const item = array[i];
if (wrap) {
// need to wrap each item and store in new array...
newArray[i] = wrap.call(ItemType, item, options);
} else {
// need to coerce...
// if not wrapping items then original array and new array
// are the same
newArray[i] = coerce.call(ItemType, item, options);
}
}
} else {
newArray = array.slice(0);
}
return newArray;
}
ArrayType = module.exports = Model.extend({
typeName: 'array',
wrap: true,
constructable: false,
// the instanceof check for Array type values is a little different
isInstance: function (value) {
return value && (value.Model === ArrayType);
},
convertArrayItems,
flagAsArrayType,
clean: function (value, options) {
let property;
let items;
// The property that we're currently coercing is passed in via
// options. We use the property to get information about the types
// of each item
if ((property = options.property) && (items = property.items)) {
options.property = items;
const itemType = items.type;
if (itemType.clean) {
let i = value.length;
const clone = new Array(i);
while (--i >= 0) {
clone[i] = itemType.clean(value[i], options);
}
return clone;
}
options.property = property;
}
return Model.cleanArray(value, options);
},
coerce: function (value, options) {
if (value == null) {
return value;
}
if (ArrayType.isInstance(value)) {
return value;
}
const valueIsArray = Array.isArray(value);
let oldArray;
if (options.strict) {
if (!valueIsArray) {
this.coercionError(value, options);
return;
}
oldArray = value;
} else {
oldArray = valueIsArray ? value : [value];
}
let property;
let items;
let newArray;
// The property that we're currently coercing is passed in via
// options. We use the property to get information about the types
// of each item
if ((property = options.property) && (items = property.items)) {
Model._forProperty(items, options, function (options) {
newArray = convertArrayItems(oldArray, items.type, options);
});
} else {
newArray = oldArray.slice(0);
flagAsArrayType(newArray);
}
return newArray;
}
});