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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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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": "deprecated"
+};
+
+const { merge } = require("../util/object");
+const { union } = require("../util/array");
+const { isNil, isRegExp } = require("../lang/type");
+
+// The possible return values of getTypeOf.
+const VALID_TYPES = [
+ "array",
+ "boolean",
+ "function",
+ "null",
+ "number",
+ "object",
+ "string",
+ "undefined",
+ "regexp"
+];
+
+const { isArray } = Array;
+
+/**
+ * Returns a validated options dictionary given some requirements. If any of
+ * the requirements are not met, an exception is thrown.
+ *
+ * @param options
+ * An object, the options dictionary to validate. It's not modified.
+ * If it's null or otherwise falsey, an empty object is assumed.
+ * @param requirements
+ * An object whose keys are the expected keys in options. Any key in
+ * options that is not present in requirements is ignored. Each value
+ * in requirements is itself an object describing the requirements of
+ * its key. There are four optional keys in this object:
+ * map: A function that's passed the value of the key in options.
+ * map's return value is taken as the key's value in the final
+ * validated options, is, and ok. If map throws an exception
+ * it's caught and discarded, and the key's value is its value in
+ * options.
+ * is: An array containing any number of the typeof type names. If
+ * the key's value is none of these types, it fails validation.
+ * Arrays, null and regexps are identified by the special type names
+ * "array", "null", "regexp"; "object" will not match either. No type
+ * coercion is done.
+ * ok: A function that's passed the key's value. If it returns
+ * false, the value fails validation.
+ * msg: If the key's value fails validation, an exception is thrown.
+ * This string will be used as its message. If undefined, a
+ * generic message is used, unless is is defined, in which case
+ * the message will state that the value needs to be one of the
+ * given types.
+ * @return An object whose keys are those keys in requirements that are also in
+ * options and whose values are the corresponding return values of map
+ * or the corresponding values in options. Note that any keys not
+ * shared by both requirements and options are not in the returned
+ * object.
+ */
+exports.validateOptions = function validateOptions(options, requirements) {
+ options = options || {};
+ let validatedOptions = {};
+
+ for (let key in requirements) {
+ let isOptional = false;
+ let mapThrew = false;
+ let req = requirements[key];
+ let [optsVal, keyInOpts] = (key in options) ?
+ [options[key], true] :
+ [undefined, false];
+ if (req.map) {
+ try {
+ optsVal = req.map(optsVal);
+ }
+ catch (err) {
+ if (err instanceof RequirementError)
+ throw err;
+
+ mapThrew = true;
+ }
+ }
+ if (req.is) {
+ let types = req.is;
+
+ if (!isArray(types) && isArray(types.is))
+ types = types.is;
+
+ if (isArray(types)) {
+ isOptional = ['undefined', 'null'].every(v => ~types.indexOf(v));
+
+ // Sanity check the caller's type names.
+ types.forEach(function (typ) {
+ if (VALID_TYPES.indexOf(typ) < 0) {
+ let msg = 'Internal error: invalid requirement type "' + typ + '".';
+ throw new Error(msg);
+ }
+ });
+ if (types.indexOf(getTypeOf(optsVal)) < 0)
+ throw new RequirementError(key, req);
+ }
+ }
+
+ if (req.ok && ((!isOptional || !isNil(optsVal)) && !req.ok(optsVal)))
+ throw new RequirementError(key, req);
+
+ if (keyInOpts || (req.map && !mapThrew && optsVal !== undefined))
+ validatedOptions[key] = optsVal;
+ }
+
+ return validatedOptions;
+};
+
+exports.addIterator = function addIterator(obj, keysValsGenerator) {
+ obj.__iterator__ = function(keysOnly, keysVals) {
+ let keysValsIterator = keysValsGenerator.call(this);
+
+ // "for (.. in ..)" gets only keys, "for each (.. in ..)" gets values,
+ // and "for (.. in Iterator(..))" gets [key, value] pairs.
+ let index = keysOnly ? 0 : 1;
+ while (true)
+ yield keysVals ? keysValsIterator.next() : keysValsIterator.next()[index];
+ };
+};
+
+// Similar to typeof, except arrays, null and regexps are identified by "array" and
+// "null" and "regexp", not "object".
+var getTypeOf = exports.getTypeOf = function getTypeOf(val) {
+ let typ = typeof(val);
+ if (typ === "object") {
+ if (!val)
+ return "null";
+ if (isArray(val))
+ return "array";
+ if (isRegExp(val))
+ return "regexp";
+ }
+ return typ;
+}
+
+function RequirementError(key, requirement) {
+ Error.call(this);
+
+ this.name = "RequirementError";
+
+ let msg = requirement.msg;
+ if (!msg) {
+ msg = 'The option "' + key + '" ';
+ msg += requirement.is ?
+ "must be one of the following types: " + requirement.is.join(", ") :
+ "is invalid.";
+ }
+
+ this.message = msg;
+}
+RequirementError.prototype = Object.create(Error.prototype);
+
+var string = { is: ['string', 'undefined', 'null'] };
+exports.string = string;
+
+var number = { is: ['number', 'undefined', 'null'] };
+exports.number = number;
+
+var boolean = { is: ['boolean', 'undefined', 'null'] };
+exports.boolean = boolean;
+
+var object = { is: ['object', 'undefined', 'null'] };
+exports.object = object;
+
+var array = { is: ['array', 'undefined', 'null'] };
+exports.array = array;
+
+var isTruthyType = type => !(type === 'undefined' || type === 'null');
+var findTypes = v => { while (!isArray(v) && v.is) v = v.is; return v };
+
+function required(req) {
+ let types = (findTypes(req) || VALID_TYPES).filter(isTruthyType);
+
+ return merge({}, req, {is: types});
+}
+exports.required = required;
+
+function optional(req) {
+ req = merge({is: []}, req);
+ req.is = findTypes(req).filter(isTruthyType).concat('undefined', 'null');
+
+ return req;
+}
+exports.optional = optional;
+
+function either(...types) {
+ return union.apply(null, types.map(findTypes));
+}
+exports.either = either;