322 lines
9.3 KiB
JavaScript
322 lines
9.3 KiB
JavaScript
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/**
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* @fileoverview Create configurations for a rule
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* @author Ian VanSchooten
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const Rules = require("../rules"),
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loadRules = require("../load-rules");
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const rules = new Rules();
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Wrap all of the elements of an array into arrays.
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* @param {*[]} xs Any array.
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* @returns {Array[]} An array of arrays.
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*/
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function explodeArray(xs) {
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return xs.reduce((accumulator, x) => {
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accumulator.push([x]);
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return accumulator;
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}, []);
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}
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/**
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* Mix two arrays such that each element of the second array is concatenated
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* onto each element of the first array.
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*
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* For example:
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* combineArrays([a, [b, c]], [x, y]); // -> [[a, x], [a, y], [b, c, x], [b, c, y]]
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*
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* @param {array} arr1 The first array to combine.
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* @param {array} arr2 The second array to combine.
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* @returns {array} A mixture of the elements of the first and second arrays.
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*/
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function combineArrays(arr1, arr2) {
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const res = [];
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if (arr1.length === 0) {
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return explodeArray(arr2);
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}
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if (arr2.length === 0) {
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return explodeArray(arr1);
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}
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arr1.forEach(x1 => {
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arr2.forEach(x2 => {
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res.push([].concat(x1, x2));
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});
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});
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return res;
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}
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/**
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* Group together valid rule configurations based on object properties
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*
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* e.g.:
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* groupByProperty([
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* {before: true},
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* {before: false},
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* {after: true},
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* {after: false}
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* ]);
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*
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* will return:
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* [
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* [{before: true}, {before: false}],
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* [{after: true}, {after: false}]
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* ]
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*
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* @param {Object[]} objects Array of objects, each with one property/value pair
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* @returns {Array[]} Array of arrays of objects grouped by property
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*/
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function groupByProperty(objects) {
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const groupedObj = objects.reduce((accumulator, obj) => {
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const prop = Object.keys(obj)[0];
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accumulator[prop] = accumulator[prop] ? accumulator[prop].concat(obj) : [obj];
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return accumulator;
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}, {});
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return Object.keys(groupedObj).map(prop => groupedObj[prop]);
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}
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//------------------------------------------------------------------------------
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// Private
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//------------------------------------------------------------------------------
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/**
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* Configuration settings for a rule.
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*
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* A configuration can be a single number (severity), or an array where the first
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* element in the array is the severity, and is the only required element.
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* Configs may also have one or more additional elements to specify rule
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* configuration or options.
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*
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* @typedef {array|number} ruleConfig
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* @param {number} 0 The rule's severity (0, 1, 2).
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*/
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/**
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* Object whose keys are rule names and values are arrays of valid ruleConfig items
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* which should be linted against the target source code to determine error counts.
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* (a ruleConfigSet.ruleConfigs).
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*
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* e.g. rulesConfig = {
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* "comma-dangle": [2, [2, "always"], [2, "always-multiline"], [2, "never"]],
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* "no-console": [2]
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* }
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* @typedef rulesConfig
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*/
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/**
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* Create valid rule configurations by combining two arrays,
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* with each array containing multiple objects each with a
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* single property/value pair and matching properties.
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*
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* e.g.:
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* combinePropertyObjects(
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* [{before: true}, {before: false}],
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* [{after: true}, {after: false}]
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* );
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*
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* will return:
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* [
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* {before: true, after: true},
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* {before: true, after: false},
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* {before: false, after: true},
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* {before: false, after: false}
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* ]
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*
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* @param {Object[]} objArr1 Single key/value objects, all with the same key
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* @param {Object[]} objArr2 Single key/value objects, all with another key
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* @returns {Object[]} Combined objects for each combination of input properties and values
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*/
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function combinePropertyObjects(objArr1, objArr2) {
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const res = [];
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if (objArr1.length === 0) {
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return objArr2;
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}
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if (objArr2.length === 0) {
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return objArr1;
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}
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objArr1.forEach(obj1 => {
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objArr2.forEach(obj2 => {
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const combinedObj = {};
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const obj1Props = Object.keys(obj1);
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const obj2Props = Object.keys(obj2);
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obj1Props.forEach(prop1 => {
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combinedObj[prop1] = obj1[prop1];
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});
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obj2Props.forEach(prop2 => {
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combinedObj[prop2] = obj2[prop2];
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});
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res.push(combinedObj);
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});
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});
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return res;
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}
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/**
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* Creates a new instance of a rule configuration set
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*
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* A rule configuration set is an array of configurations that are valid for a
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* given rule. For example, the configuration set for the "semi" rule could be:
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*
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* ruleConfigSet.ruleConfigs // -> [[2], [2, "always"], [2, "never"]]
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*
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* Rule configuration set class
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*/
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class RuleConfigSet {
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/**
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* @param {ruleConfig[]} configs Valid rule configurations
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*/
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constructor(configs) {
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/**
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* Stored valid rule configurations for this instance
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* @type {array}
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*/
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this.ruleConfigs = configs || [];
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}
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/**
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* Add a severity level to the front of all configs in the instance.
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* This should only be called after all configs have been added to the instance.
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*
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* @returns {void}
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*/
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addErrorSeverity() {
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const severity = 2;
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this.ruleConfigs = this.ruleConfigs.map(config => {
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config.unshift(severity);
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return config;
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});
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// Add a single config at the beginning consisting of only the severity
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this.ruleConfigs.unshift(severity);
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}
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/**
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* Add rule configs from an array of strings (schema enums)
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* @param {string[]} enums Array of valid rule options (e.g. ["always", "never"])
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* @returns {void}
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*/
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addEnums(enums) {
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this.ruleConfigs = this.ruleConfigs.concat(combineArrays(this.ruleConfigs, enums));
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}
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/**
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* Add rule configurations from a schema object
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* @param {Object} obj Schema item with type === "object"
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* @returns {boolean} true if at least one schema for the object could be generated, false otherwise
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*/
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addObject(obj) {
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const objectConfigSet = {
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objectConfigs: [],
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add(property, values) {
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for (let idx = 0; idx < values.length; idx++) {
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const optionObj = {};
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optionObj[property] = values[idx];
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this.objectConfigs.push(optionObj);
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}
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},
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combine() {
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this.objectConfigs = groupByProperty(this.objectConfigs).reduce((accumulator, objArr) => combinePropertyObjects(accumulator, objArr), []);
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}
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};
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/*
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* The object schema could have multiple independent properties.
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* If any contain enums or booleans, they can be added and then combined
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*/
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Object.keys(obj.properties).forEach(prop => {
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if (obj.properties[prop].enum) {
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objectConfigSet.add(prop, obj.properties[prop].enum);
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}
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if (obj.properties[prop].type && obj.properties[prop].type === "boolean") {
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objectConfigSet.add(prop, [true, false]);
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}
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});
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objectConfigSet.combine();
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if (objectConfigSet.objectConfigs.length > 0) {
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this.ruleConfigs = this.ruleConfigs.concat(combineArrays(this.ruleConfigs, objectConfigSet.objectConfigs));
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return true;
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}
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return false;
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}
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}
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/**
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* Generate valid rule configurations based on a schema object
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* @param {Object} schema A rule's schema object
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* @returns {array[]} Valid rule configurations
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*/
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function generateConfigsFromSchema(schema) {
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const configSet = new RuleConfigSet();
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if (Array.isArray(schema)) {
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for (const opt of schema) {
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if (opt.enum) {
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configSet.addEnums(opt.enum);
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} else if (opt.type && opt.type === "object") {
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if (!configSet.addObject(opt)) {
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break;
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}
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// TODO (IanVS): support oneOf
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} else {
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// If we don't know how to fill in this option, don't fill in any of the following options.
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break;
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}
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}
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}
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configSet.addErrorSeverity();
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return configSet.ruleConfigs;
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}
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/**
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* Generate possible rule configurations for all of the core rules
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* @returns {rulesConfig} Hash of rule names and arrays of possible configurations
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*/
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function createCoreRuleConfigs() {
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const ruleList = loadRules();
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return Object.keys(ruleList).reduce((accumulator, id) => {
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const rule = rules.get(id);
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const schema = (typeof rule === "function") ? rule.schema : rule.meta.schema;
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accumulator[id] = generateConfigsFromSchema(schema);
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return accumulator;
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}, {});
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}
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//------------------------------------------------------------------------------
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// Public Interface
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//------------------------------------------------------------------------------
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module.exports = {
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generateConfigsFromSchema,
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createCoreRuleConfigs
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};
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