457 lines
12 KiB
JavaScript
457 lines
12 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, '__esModule', { value: true });
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function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }
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var path = _interopDefault(require('path'));
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var minimatch = _interopDefault(require('minimatch'));
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var createDebug = _interopDefault(require('debug'));
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var objectSchema = require('@humanwhocodes/object-schema');
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/**
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* @fileoverview ConfigSchema
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* @author Nicholas C. Zakas
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*/
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Assets that a given value is an array.
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* @param {*} value The value to check.
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* @returns {void}
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* @throws {TypeError} When the value is not an array.
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*/
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function assertIsArray(value) {
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if (!Array.isArray(value)) {
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throw new TypeError('Expected value to be an array.');
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}
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}
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/**
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* Assets that a given value is an array containing only strings and functions.
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* @param {*} value The value to check.
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* @returns {void}
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* @throws {TypeError} When the value is not an array of strings and functions.
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*/
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function assertIsArrayOfStringsAndFunctions(value, name) {
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assertIsArray(value);
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if (value.some(item => typeof item !== 'string' && typeof item !== 'function')) {
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throw new TypeError('Expected array to only contain strings.');
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}
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}
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//------------------------------------------------------------------------------
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// Exports
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//------------------------------------------------------------------------------
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/**
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* The base schema that every ConfigArray uses.
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* @type Object
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*/
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const baseSchema = Object.freeze({
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name: {
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required: false,
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merge() {
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return undefined;
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},
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validate(value) {
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if (typeof value !== 'string') {
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throw new TypeError('Property must be a string.');
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}
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}
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},
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files: {
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required: false,
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merge() {
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return undefined;
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},
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validate(value) {
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// first check if it's an array
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assertIsArray(value);
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// then check each member
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value.forEach(item => {
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if (Array.isArray(item)) {
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assertIsArrayOfStringsAndFunctions(item);
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} else if (typeof item !== 'string' && typeof item !== 'function') {
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throw new TypeError('Items must be a string, a function, or an array of strings and functions.');
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}
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});
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}
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},
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ignores: {
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required: false,
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merge() {
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return undefined;
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},
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validate: assertIsArrayOfStringsAndFunctions
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}
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});
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/**
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* @fileoverview ConfigArray
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* @author Nicholas C. Zakas
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*/
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const debug = createDebug('@hwc/config-array');
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const MINIMATCH_OPTIONS = {
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matchBase: true
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};
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/**
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* Shorthand for checking if a value is a string.
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* @param {any} value The value to check.
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* @returns {boolean} True if a string, false if not.
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*/
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function isString(value) {
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return typeof value === 'string';
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}
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/**
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* Normalizes a `ConfigArray` by flattening it and executing any functions
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* that are found inside.
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* @param {Array} items The items in a `ConfigArray`.
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* @param {Object} context The context object to pass into any function
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* found.
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* @returns {Array} A flattened array containing only config objects.
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* @throws {TypeError} When a config function returns a function.
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*/
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async function normalize(items, context) {
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// TODO: Allow async config functions
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function *flatTraverse(array) {
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for (let item of array) {
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if (typeof item === 'function') {
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item = item(context);
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}
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if (Array.isArray(item)) {
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yield * flatTraverse(item);
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} else if (typeof item === 'function') {
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throw new TypeError('A config function can only return an object or array.');
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} else {
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yield item;
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}
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}
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}
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return [...flatTraverse(items)];
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}
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/**
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* Determines if a given file path is matched by a config. If the config
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* has no `files` field, then it matches; otherwise, if a `files` field
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* is present then we match the globs in `files` and exclude any globs in
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* `ignores`.
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* @param {string} filePath The absolute file path to check.
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* @param {Object} config The config object to check.
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* @returns {boolean} True if the file path is matched by the config,
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* false if not.
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*/
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function pathMatches(filePath, basePath, config) {
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// a config without a `files` field always matches
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if (!config.files) {
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return true;
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}
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// if files isn't an array, throw an error
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if (!Array.isArray(config.files) || config.files.length === 0) {
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throw new TypeError('The files key must be a non-empty array.');
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}
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const relativeFilePath = path.relative(basePath, filePath);
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// match both strings and functions
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const match = pattern => {
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if (isString(pattern)) {
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return minimatch(relativeFilePath, pattern, MINIMATCH_OPTIONS);
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}
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if (typeof pattern === 'function') {
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return pattern(filePath);
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}
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};
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// check for all matches to config.files
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let matches = config.files.some(pattern => {
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if (Array.isArray(pattern)) {
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return pattern.every(match);
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}
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return match(pattern);
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});
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/*
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* If the file path matches the config.files patterns, then check to see
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* if there are any files to ignore.
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*/
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if (matches && config.ignores) {
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matches = !config.ignores.some(pattern => {
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return minimatch(filePath, pattern, MINIMATCH_OPTIONS);
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});
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}
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return matches;
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}
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/**
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* Ensures that a ConfigArray has been normalized.
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* @param {ConfigArray} configArray The ConfigArray to check.
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* @returns {void}
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* @throws {Error} When the `ConfigArray` is not normalized.
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*/
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function assertNormalized(configArray) {
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// TODO: Throw more verbose error
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if (!configArray.isNormalized()) {
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throw new Error('ConfigArray must be normalized to perform this operation.');
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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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const ConfigArraySymbol = {
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isNormalized: Symbol('isNormalized'),
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configCache: Symbol('configCache'),
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schema: Symbol('schema'),
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finalizeConfig: Symbol('finalizeConfig'),
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preprocessConfig: Symbol('preprocessConfig')
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};
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/**
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* Represents an array of config objects and provides method for working with
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* those config objects.
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*/
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class ConfigArray extends Array {
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/**
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* Creates a new instance of ConfigArray.
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* @param {Iterable|Function|Object} configs An iterable yielding config
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* objects, or a config function, or a config object.
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* @param {string} [options.basePath=""] The path of the config file
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* @param {boolean} [options.normalized=false] Flag indicating if the
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* configs have already been normalized.
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* @param {Object} [options.schema] The additional schema
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* definitions to use for the ConfigArray schema.
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*/
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constructor(configs, { basePath = '', normalized = false, schema: customSchema } = {}) {
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super();
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/**
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* Tracks if the array has been normalized.
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* @property isNormalized
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* @type boolean
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* @private
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*/
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this[ConfigArraySymbol.isNormalized] = normalized;
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/**
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* The schema used for validating and merging configs.
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* @property schema
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* @type ObjectSchema
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* @private
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*/
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this[ConfigArraySymbol.schema] = new objectSchema.ObjectSchema({
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...customSchema,
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...baseSchema
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});
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/**
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* The path of the config file that this array was loaded from.
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* This is used to calculate filename matches.
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* @property basePath
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* @type string
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*/
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this.basePath = basePath;
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/**
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* A cache to store calculated configs for faster repeat lookup.
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* @property configCache
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* @type Map
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* @private
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*/
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this[ConfigArraySymbol.configCache] = new Map();
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// load the configs into this array
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if (Array.isArray(configs)) {
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this.push(...configs);
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} else {
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this.push(configs);
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}
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}
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/**
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* Prevent normal array methods from creating a new `ConfigArray` instance.
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* This is to ensure that methods such as `slice()` won't try to create a
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* new instance of `ConfigArray` behind the scenes as doing so may throw
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* an error due to the different constructor signature.
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* @returns {Function} The `Array` constructor.
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*/
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static get [Symbol.species]() {
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return Array;
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}
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/**
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* Returns the `files` globs from every config object in the array.
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* Negated patterns (those beginning with `!`) are not returned.
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* This can be used to determine which files will be matched by a
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* config array or to use as a glob pattern when no patterns are provided
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* for a command line interface.
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* @returns {string[]} An array of string patterns.
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*/
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get files() {
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assertNormalized(this);
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const result = [];
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for (const config of this) {
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if (config.files) {
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config.files.forEach(filePattern => {
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if (Array.isArray(filePattern)) {
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result.push(...filePattern.filter(pattern => {
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return isString(pattern) && !pattern.startsWith('!');
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}));
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} else if (isString(filePattern) && !filePattern.startsWith('!')) {
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result.push(filePattern);
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}
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});
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}
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}
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return result;
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}
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/**
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* Returns the file globs that should always be ignored regardless of
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* the matching `files` fields in any configs. This is necessary to mimic
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* the behavior of things like .gitignore and .eslintignore, allowing a
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* globbing operation to be faster.
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* @returns {string[]} An array of string patterns to be ignored.
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*/
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get ignores() {
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assertNormalized(this);
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const result = [];
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for (const config of this) {
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if (config.ignores && !config.files) {
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result.push(...config.ignores.filter(isString));
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}
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}
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return result;
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}
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/**
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* Indicates if the config array has been normalized.
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* @returns {boolean} True if the config array is normalized, false if not.
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*/
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isNormalized() {
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return this[ConfigArraySymbol.isNormalized];
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}
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/**
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* Normalizes a config array by flattening embedded arrays and executing
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* config functions.
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* @param {ConfigContext} context The context object for config functions.
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* @returns {ConfigArray} A new ConfigArray instance that is normalized.
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*/
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async normalize(context = {}) {
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if (!this.isNormalized()) {
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const normalizedConfigs = await normalize(this, context);
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this.length = 0;
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this.push(...normalizedConfigs.map(this[ConfigArraySymbol.preprocessConfig]));
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this[ConfigArraySymbol.isNormalized] = true;
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// prevent further changes
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Object.freeze(this);
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}
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return this;
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}
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/**
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* Finalizes the state of a config before being cached and returned by
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* `getConfig()`. Does nothing by default but is provided to be
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* overridden by subclasses as necessary.
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* @param {Object} config The config to finalize.
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* @returns {Object} The finalized config.
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*/
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[ConfigArraySymbol.finalizeConfig](config) {
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return config;
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}
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/**
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* Preprocesses a config during the normalization process. This is the
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* method to override if you want to convert an array item before it is
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* validated for the first time. For example, if you want to replace a
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* string with an object, this is the method to override.
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* @param {Object} config The config to preprocess.
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* @returns {Object} The config to use in place of the argument.
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*/
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[ConfigArraySymbol.preprocessConfig](config) {
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return config;
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}
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/**
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* Returns the config object for a given file path.
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* @param {string} filePath The complete path of a file to get a config for.
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* @returns {Object} The config object for this file.
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*/
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getConfig(filePath) {
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assertNormalized(this);
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// first check the cache to avoid duplicate work
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let finalConfig = this[ConfigArraySymbol.configCache].get(filePath);
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if (finalConfig) {
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return finalConfig;
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}
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// No config found in cache, so calculate a new one
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const matchingConfigs = [];
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for (const config of this) {
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if (pathMatches(filePath, this.basePath, config)) {
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debug(`Matching config found for ${filePath}`);
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matchingConfigs.push(config);
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} else {
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debug(`No matching config found for ${filePath}`);
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}
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}
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finalConfig = matchingConfigs.reduce((result, config) => {
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return this[ConfigArraySymbol.schema].merge(result, config);
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}, {}, this);
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finalConfig = this[ConfigArraySymbol.finalizeConfig](finalConfig);
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this[ConfigArraySymbol.configCache].set(filePath, finalConfig);
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return finalConfig;
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}
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}
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exports.ConfigArray = ConfigArray;
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exports.ConfigArraySymbol = ConfigArraySymbol;
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