/** * @fileoverview Used for creating a suggested configuration based on project code. * @author Ian VanSchooten */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const lodash = require("lodash"), Linter = require("../linter"), configRule = require("./config-rule"), ConfigOps = require("./config-ops"), recConfig = require("../../conf/eslint-recommended"); const debug = require("debug")("eslint:autoconfig"); const linter = new Linter(); //------------------------------------------------------------------------------ // Data //------------------------------------------------------------------------------ const MAX_CONFIG_COMBINATIONS = 17, // 16 combinations + 1 for severity only RECOMMENDED_CONFIG_NAME = "eslint:recommended"; //------------------------------------------------------------------------------ // Private //------------------------------------------------------------------------------ /** * Information about a rule configuration, in the context of a Registry. * * @typedef {Object} registryItem * @param {ruleConfig} config A valid configuration for the rule * @param {number} specificity The number of elements in the ruleConfig array * @param {number} errorCount The number of errors encountered when linting with the config */ /** * This callback is used to measure execution status in a progress bar * @callback progressCallback * @param {number} The total number of times the callback will be called. */ /** * Create registryItems for rules * @param {rulesConfig} rulesConfig Hash of rule names and arrays of ruleConfig items * @returns {Object} registryItems for each rule in provided rulesConfig */ function makeRegistryItems(rulesConfig) { return Object.keys(rulesConfig).reduce((accumulator, ruleId) => { accumulator[ruleId] = rulesConfig[ruleId].map(config => ({ config, specificity: config.length || 1, errorCount: void 0 })); return accumulator; }, {}); } /** * Creates an object in which to store rule configs and error counts * * Unless a rulesConfig is provided at construction, the registry will not contain * any rules, only methods. This will be useful for building up registries manually. * * Registry class */ class Registry { /** * @param {rulesConfig} [rulesConfig] Hash of rule names and arrays of possible configurations */ constructor(rulesConfig) { this.rules = (rulesConfig) ? makeRegistryItems(rulesConfig) : {}; } /** * Populate the registry with core rule configs. * * It will set the registry's `rule` property to an object having rule names * as keys and an array of registryItems as values. * * @returns {void} */ populateFromCoreRules() { const rulesConfig = configRule.createCoreRuleConfigs(); this.rules = makeRegistryItems(rulesConfig); } /** * Creates sets of rule configurations which can be used for linting * and initializes registry errors to zero for those configurations (side effect). * * This combines as many rules together as possible, such that the first sets * in the array will have the highest number of rules configured, and later sets * will have fewer and fewer, as not all rules have the same number of possible * configurations. * * The length of the returned array will be <= MAX_CONFIG_COMBINATIONS. * * @param {Object} registry The autoconfig registry * @returns {Object[]} "rules" configurations to use for linting */ buildRuleSets() { let idx = 0; const ruleIds = Object.keys(this.rules), ruleSets = []; /** * Add a rule configuration from the registry to the ruleSets * * This is broken out into its own function so that it doesn't need to be * created inside of the while loop. * * @param {string} rule The ruleId to add. * @returns {void} */ const addRuleToRuleSet = function(rule) { /* * This check ensures that there is a rule configuration and that * it has fewer than the max combinations allowed. * If it has too many configs, we will only use the most basic of * the possible configurations. */ const hasFewCombos = (this.rules[rule].length <= MAX_CONFIG_COMBINATIONS); if (this.rules[rule][idx] && (hasFewCombos || this.rules[rule][idx].specificity <= 2)) { /* * If the rule has too many possible combinations, only take * simple ones, avoiding objects. */ if (!hasFewCombos && typeof this.rules[rule][idx].config[1] === "object") { return; } ruleSets[idx] = ruleSets[idx] || {}; ruleSets[idx][rule] = this.rules[rule][idx].config; /* * Initialize errorCount to zero, since this is a config which * will be linted. */ this.rules[rule][idx].errorCount = 0; } }.bind(this); while (ruleSets.length === idx) { ruleIds.forEach(addRuleToRuleSet); idx += 1; } return ruleSets; } /** * Remove all items from the registry with a non-zero number of errors * * Note: this also removes rule configurations which were not linted * (meaning, they have an undefined errorCount). * * @returns {void} */ stripFailingConfigs() { const ruleIds = Object.keys(this.rules), newRegistry = new Registry(); newRegistry.rules = Object.assign({}, this.rules); ruleIds.forEach(ruleId => { const errorFreeItems = newRegistry.rules[ruleId].filter(registryItem => (registryItem.errorCount === 0)); if (errorFreeItems.length > 0) { newRegistry.rules[ruleId] = errorFreeItems; } else { delete newRegistry.rules[ruleId]; } }); return newRegistry; } /** * Removes rule configurations which were not included in a ruleSet * * @returns {void} */ stripExtraConfigs() { const ruleIds = Object.keys(this.rules), newRegistry = new Registry(); newRegistry.rules = Object.assign({}, this.rules); ruleIds.forEach(ruleId => { newRegistry.rules[ruleId] = newRegistry.rules[ruleId].filter(registryItem => (typeof registryItem.errorCount !== "undefined")); }); return newRegistry; } /** * Creates a registry of rules which had no error-free configs. * The new registry is intended to be analyzed to determine whether its rules * should be disabled or set to warning. * * @returns {Registry} A registry of failing rules. */ getFailingRulesRegistry() { const ruleIds = Object.keys(this.rules), failingRegistry = new Registry(); ruleIds.forEach(ruleId => { const failingConfigs = this.rules[ruleId].filter(registryItem => (registryItem.errorCount > 0)); if (failingConfigs && failingConfigs.length === this.rules[ruleId].length) { failingRegistry.rules[ruleId] = failingConfigs; } }); return failingRegistry; } /** * Create an eslint config for any rules which only have one configuration * in the registry. * * @returns {Object} An eslint config with rules section populated */ createConfig() { const ruleIds = Object.keys(this.rules), config = { rules: {} }; ruleIds.forEach(ruleId => { if (this.rules[ruleId].length === 1) { config.rules[ruleId] = this.rules[ruleId][0].config; } }); return config; } /** * Return a cloned registry containing only configs with a desired specificity * * @param {number} specificity Only keep configs with this specificity * @returns {Registry} A registry of rules */ filterBySpecificity(specificity) { const ruleIds = Object.keys(this.rules), newRegistry = new Registry(); newRegistry.rules = Object.assign({}, this.rules); ruleIds.forEach(ruleId => { newRegistry.rules[ruleId] = this.rules[ruleId].filter(registryItem => (registryItem.specificity === specificity)); }); return newRegistry; } /** * Lint SourceCodes against all configurations in the registry, and record results * * @param {Object[]} sourceCodes SourceCode objects for each filename * @param {Object} config ESLint config object * @param {progressCallback} [cb] Optional callback for reporting execution status * @returns {Registry} New registry with errorCount populated */ lintSourceCode(sourceCodes, config, cb) { let lintedRegistry = new Registry(); lintedRegistry.rules = Object.assign({}, this.rules); const ruleSets = lintedRegistry.buildRuleSets(); lintedRegistry = lintedRegistry.stripExtraConfigs(); debug("Linting with all possible rule combinations"); const filenames = Object.keys(sourceCodes); const totalFilesLinting = filenames.length * ruleSets.length; filenames.forEach(filename => { debug(`Linting file: ${filename}`); let ruleSetIdx = 0; ruleSets.forEach(ruleSet => { const lintConfig = Object.assign({}, config, { rules: ruleSet }); const lintResults = linter.verify(sourceCodes[filename], lintConfig); lintResults.forEach(result => { /* * It is possible that the error is from a configuration comment * in a linted file, in which case there may not be a config * set in this ruleSetIdx. * (https://github.com/eslint/eslint/issues/5992) * (https://github.com/eslint/eslint/issues/7860) */ if ( lintedRegistry.rules[result.ruleId] && lintedRegistry.rules[result.ruleId][ruleSetIdx] ) { lintedRegistry.rules[result.ruleId][ruleSetIdx].errorCount += 1; } }); ruleSetIdx += 1; if (cb) { cb(totalFilesLinting); // eslint-disable-line callback-return } }); // Deallocate for GC sourceCodes[filename] = null; }); return lintedRegistry; } } /** * Extract rule configuration into eslint:recommended where possible. * * This will return a new config with `"extends": "eslint:recommended"` and * only the rules which have configurations different from the recommended config. * * @param {Object} config config object * @returns {Object} config object using `"extends": "eslint:recommended"` */ function extendFromRecommended(config) { const newConfig = Object.assign({}, config); ConfigOps.normalizeToStrings(newConfig); const recRules = Object.keys(recConfig.rules).filter(ruleId => ConfigOps.isErrorSeverity(recConfig.rules[ruleId])); recRules.forEach(ruleId => { if (lodash.isEqual(recConfig.rules[ruleId], newConfig.rules[ruleId])) { delete newConfig.rules[ruleId]; } }); newConfig.extends = RECOMMENDED_CONFIG_NAME; return newConfig; } //------------------------------------------------------------------------------ // Public Interface //------------------------------------------------------------------------------ module.exports = { Registry, extendFromRecommended };