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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 http://mozilla.org/MPL/2.0/. */
"use strict";
module.metadata = {
"stability": "unstable"
};
const { validateOptions: valid } = require("../deprecated/api-utils");
const method = require("method/core");
// Function takes property validation rules and returns function that given
// an `options` object will return validated / normalized options back. If
// option(s) are invalid validator will throw exception described by rules.
// Returned will also have contain `rules` property with a given validation
// rules and `properties` function that can be used to generate validated
// property getter and setters can be mixed into prototype. For more details
// see `properties` function below.
function contract(rules) {
const validator = (instance, options) => {
return valid(options || instance || {}, rules);
};
validator.rules = rules
validator.properties = function(modelFor) {
return properties(modelFor, rules);
}
return validator;
}
exports.contract = contract
// Function takes `modelFor` instance state model accessor functions and
// a property validation rules and generates object with getters and setters
// that can be mixed into prototype. Property accessors update model for the
// given instance. If you wish to react to property updates you can always
// override setters to put specific logic.
function properties(modelFor, rules) {
let descriptor = Object.keys(rules).reduce(function(descriptor, name) {
descriptor[name] = {
get: function() { return modelFor(this)[name] },
set: function(value) {
let change = {};
change[name] = value;
modelFor(this)[name] = valid(change, rules)[name];
}
}
return descriptor
}, {});
return Object.create(Object.prototype, descriptor);
}
exports.properties = properties;
const validate = method("contract/validate");
exports.validate = validate;
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