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797 lines
26 KiB
797 lines
26 KiB
/**
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* @fileoverview Main CLI object.
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* @author Nicholas C. Zakas
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*/
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"use strict";
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/*
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* The CLI object should *not* call process.exit() directly. It should only return
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* exit codes. This allows other programs to use the CLI object and still control
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* when the program exits.
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*/
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const fs = require("fs"),
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path = require("path"),
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rules = require("./rules"),
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eslint = require("./eslint"),
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defaultOptions = require("../conf/cli-options"),
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IgnoredPaths = require("./ignored-paths"),
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Config = require("./config"),
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Plugins = require("./config/plugins"),
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fileEntryCache = require("file-entry-cache"),
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globUtil = require("./util/glob-util"),
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SourceCodeFixer = require("./util/source-code-fixer"),
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validator = require("./config/config-validator"),
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stringify = require("json-stable-stringify"),
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hash = require("./util/hash"),
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pkg = require("../package.json");
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const debug = require("debug")("eslint:cli-engine");
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//------------------------------------------------------------------------------
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// Typedefs
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//------------------------------------------------------------------------------
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/**
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* The options to configure a CLI engine with.
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* @typedef {Object} CLIEngineOptions
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* @property {boolean} allowInlineConfig Enable or disable inline configuration comments.
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* @property {boolean|Object} baseConfig Base config object. True enables recommend rules and environments.
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* @property {boolean} cache Enable result caching.
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* @property {string} cacheLocation The cache file to use instead of .eslintcache.
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* @property {string} configFile The configuration file to use.
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* @property {string} cwd The value to use for the current working directory.
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* @property {string[]} envs An array of environments to load.
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* @property {string[]} extensions An array of file extensions to check.
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* @property {boolean} fix Execute in autofix mode.
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* @property {string[]} globals An array of global variables to declare.
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* @property {boolean} ignore False disables use of .eslintignore.
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* @property {string} ignorePath The ignore file to use instead of .eslintignore.
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* @property {string} ignorePattern A glob pattern of files to ignore.
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* @property {boolean} useEslintrc False disables looking for .eslintrc
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* @property {string} parser The name of the parser to use.
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* @property {Object} parserOptions An object of parserOption settings to use.
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* @property {string[]} plugins An array of plugins to load.
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* @property {Object<string,*>} rules An object of rules to use.
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* @property {string[]} rulePaths An array of directories to load custom rules from.
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*/
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/**
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* A linting warning or error.
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* @typedef {Object} LintMessage
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* @property {string} message The message to display to the user.
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*/
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/**
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* A linting result.
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* @typedef {Object} LintResult
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* @property {string} filePath The path to the file that was linted.
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* @property {LintMessage[]} messages All of the messages for the result.
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* @property {number} errorCount Number or errors for the result.
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* @property {number} warningCount Number or warnings for the result.
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* @property {string=} [source] The source code of the file that was linted.
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* @property {string=} [output] The source code of the file that was linted, with as many fixes applied as possible.
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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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* It will calculate the error and warning count for collection of messages per file
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* @param {Object[]} messages - Collection of messages
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* @returns {Object} Contains the stats
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* @private
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*/
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function calculateStatsPerFile(messages) {
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return messages.reduce(function(stat, message) {
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if (message.fatal || message.severity === 2) {
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stat.errorCount++;
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} else {
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stat.warningCount++;
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}
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return stat;
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}, {
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errorCount: 0,
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warningCount: 0
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});
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}
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/**
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* It will calculate the error and warning count for collection of results from all files
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* @param {Object[]} results - Collection of messages from all the files
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* @returns {Object} Contains the stats
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* @private
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*/
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function calculateStatsPerRun(results) {
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return results.reduce(function(stat, result) {
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stat.errorCount += result.errorCount;
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stat.warningCount += result.warningCount;
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return stat;
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}, {
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errorCount: 0,
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warningCount: 0
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});
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}
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/**
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* Performs multiple autofix passes over the text until as many fixes as possible
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* have been applied.
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* @param {string} text The source text to apply fixes to.
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* @param {Object} config The ESLint config object to use.
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* @param {Object} options The ESLint options object to use.
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* @param {string} options.filename The filename from which the text was read.
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* @param {boolean} options.allowInlineConfig Flag indicating if inline comments
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* should be allowed.
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* @returns {Object} The result of the fix operation as returned from the
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* SourceCodeFixer.
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* @private
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*/
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function multipassFix(text, config, options) {
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const MAX_PASSES = 10;
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let messages = [],
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fixedResult,
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fixed = false,
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passNumber = 0;
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/**
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* This loop continues until one of the following is true:
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*
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* 1. No more fixes have been applied.
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* 2. Ten passes have been made.
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*
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* That means anytime a fix is successfully applied, there will be another pass.
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* Essentially, guaranteeing a minimum of two passes.
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*/
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do {
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passNumber++;
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debug(`Linting code for ${options.filename} (pass ${passNumber})`);
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messages = eslint.verify(text, config, options);
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debug(`Generating fixed text for ${options.filename} (pass ${passNumber})`);
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fixedResult = SourceCodeFixer.applyFixes(eslint.getSourceCode(), messages);
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// stop if there are any syntax errors.
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// 'fixedResult.output' is a empty string.
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if (messages.length === 1 && messages[0].fatal) {
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break;
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}
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// keep track if any fixes were ever applied - important for return value
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fixed = fixed || fixedResult.fixed;
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// update to use the fixed output instead of the original text
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text = fixedResult.output;
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} while (
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fixedResult.fixed &&
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passNumber < MAX_PASSES
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);
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/*
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* If the last result had fixes, we need to lint again to be sure we have
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* the most up-to-date information.
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*/
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if (fixedResult.fixed) {
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fixedResult.messages = eslint.verify(text, config, options);
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}
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// ensure the last result properly reflects if fixes were done
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fixedResult.fixed = fixed;
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fixedResult.output = text;
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return fixedResult;
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}
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/**
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* Processes an source code using ESLint.
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* @param {string} text The source code to check.
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* @param {Object} configHelper The configuration options for ESLint.
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* @param {string} filename An optional string representing the texts filename.
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* @param {boolean} fix Indicates if fixes should be processed.
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* @param {boolean} allowInlineConfig Allow/ignore comments that change config.
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* @returns {LintResult} The results for linting on this text.
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* @private
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*/
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function processText(text, configHelper, filename, fix, allowInlineConfig) {
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// clear all existing settings for a new file
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eslint.reset();
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let filePath,
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messages,
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fileExtension,
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processor,
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fixedResult;
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if (filename) {
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filePath = path.resolve(filename);
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fileExtension = path.extname(filename);
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}
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filename = filename || "<text>";
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debug(`Linting ${filename}`);
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const config = configHelper.getConfig(filePath);
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if (config.plugins) {
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Plugins.loadAll(config.plugins);
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}
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const loadedPlugins = Plugins.getAll();
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for (const plugin in loadedPlugins) {
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if (loadedPlugins[plugin].processors && Object.keys(loadedPlugins[plugin].processors).indexOf(fileExtension) >= 0) {
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processor = loadedPlugins[plugin].processors[fileExtension];
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break;
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}
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}
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if (processor) {
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debug("Using processor");
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const parsedBlocks = processor.preprocess(text, filename);
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const unprocessedMessages = [];
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parsedBlocks.forEach(function(block) {
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unprocessedMessages.push(eslint.verify(block, config, {
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filename,
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allowInlineConfig
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}));
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});
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// TODO(nzakas): Figure out how fixes might work for processors
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messages = processor.postprocess(unprocessedMessages, filename);
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} else {
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if (fix) {
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fixedResult = multipassFix(text, config, {
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filename,
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allowInlineConfig
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});
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messages = fixedResult.messages;
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} else {
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messages = eslint.verify(text, config, {
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filename,
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allowInlineConfig
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});
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}
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}
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const stats = calculateStatsPerFile(messages);
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const result = {
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filePath: filename,
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messages,
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errorCount: stats.errorCount,
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warningCount: stats.warningCount
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};
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if (fixedResult && fixedResult.fixed) {
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result.output = fixedResult.output;
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}
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if (result.errorCount + result.warningCount > 0 && typeof result.output === "undefined") {
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result.source = text;
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}
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return result;
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}
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/**
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* Processes an individual file using ESLint. Files used here are known to
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* exist, so no need to check that here.
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* @param {string} filename The filename of the file being checked.
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* @param {Object} configHelper The configuration options for ESLint.
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* @param {Object} options The CLIEngine options object.
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* @returns {LintResult} The results for linting on this file.
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* @private
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*/
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function processFile(filename, configHelper, options) {
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const text = fs.readFileSync(path.resolve(filename), "utf8"),
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result = processText(text, configHelper, filename, options.fix, options.allowInlineConfig);
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return result;
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}
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/**
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* Returns result with warning by ignore settings
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* @param {string} filePath - File path of checked code
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* @param {string} baseDir - Absolute path of base directory
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* @returns {LintResult} Result with single warning
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* @private
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*/
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function createIgnoreResult(filePath, baseDir) {
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let message;
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const isHidden = /^\./.test(path.basename(filePath));
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const isInNodeModules = baseDir && /^node_modules/.test(path.relative(baseDir, filePath));
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const isInBowerComponents = baseDir && /^bower_components/.test(path.relative(baseDir, filePath));
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if (isHidden) {
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message = "File ignored by default. Use a negated ignore pattern (like \"--ignore-pattern \'!<relative/path/to/filename>\'\") to override.";
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} else if (isInNodeModules) {
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message = "File ignored by default. Use \"--ignore-pattern \'!node_modules/*\'\" to override.";
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} else if (isInBowerComponents) {
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message = "File ignored by default. Use \"--ignore-pattern \'!bower_components/*\'\" to override.";
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} else {
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message = "File ignored because of a matching ignore pattern. Use \"--no-ignore\" to override.";
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}
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return {
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filePath: path.resolve(filePath),
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messages: [
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{
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fatal: false,
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severity: 1,
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message
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}
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],
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errorCount: 0,
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warningCount: 1
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};
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}
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/**
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* Checks if the given message is an error message.
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* @param {Object} message The message to check.
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* @returns {boolean} Whether or not the message is an error message.
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* @private
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*/
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function isErrorMessage(message) {
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return message.severity === 2;
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}
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/**
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* return the cacheFile to be used by eslint, based on whether the provided parameter is
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* a directory or looks like a directory (ends in `path.sep`), in which case the file
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* name will be the `cacheFile/.cache_hashOfCWD`
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*
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* if cacheFile points to a file or looks like a file then in will just use that file
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*
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* @param {string} cacheFile The name of file to be used to store the cache
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* @param {string} cwd Current working directory
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* @returns {string} the resolved path to the cache file
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*/
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function getCacheFile(cacheFile, cwd) {
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/*
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* make sure the path separators are normalized for the environment/os
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* keeping the trailing path separator if present
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*/
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cacheFile = path.normalize(cacheFile);
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const resolvedCacheFile = path.resolve(cwd, cacheFile);
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const looksLikeADirectory = cacheFile[cacheFile.length - 1 ] === path.sep;
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/**
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* return the name for the cache file in case the provided parameter is a directory
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* @returns {string} the resolved path to the cacheFile
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*/
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function getCacheFileForDirectory() {
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return path.join(resolvedCacheFile, `.cache_${hash(cwd)}`);
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}
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let fileStats;
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try {
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fileStats = fs.lstatSync(resolvedCacheFile);
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} catch (ex) {
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fileStats = null;
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}
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/*
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* in case the file exists we need to verify if the provided path
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* is a directory or a file. If it is a directory we want to create a file
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* inside that directory
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*/
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if (fileStats) {
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/*
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* is a directory or is a file, but the original file the user provided
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* looks like a directory but `path.resolve` removed the `last path.sep`
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* so we need to still treat this like a directory
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*/
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if (fileStats.isDirectory() || looksLikeADirectory) {
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return getCacheFileForDirectory();
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}
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// is file so just use that file
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return resolvedCacheFile;
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}
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/*
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* here we known the file or directory doesn't exist,
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* so we will try to infer if its a directory if it looks like a directory
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* for the current operating system.
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*/
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// if the last character passed is a path separator we assume is a directory
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if (looksLikeADirectory) {
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return getCacheFileForDirectory();
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}
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return resolvedCacheFile;
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}
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//------------------------------------------------------------------------------
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// Public Interface
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//------------------------------------------------------------------------------
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/**
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* Creates a new instance of the core CLI engine.
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* @param {CLIEngineOptions} options The options for this instance.
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* @constructor
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*/
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function CLIEngine(options) {
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options = Object.assign(
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Object.create(null),
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defaultOptions,
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{cwd: process.cwd()},
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options
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);
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/**
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* Stored options for this instance
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* @type {Object}
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*/
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this.options = options;
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const cacheFile = getCacheFile(this.options.cacheLocation || this.options.cacheFile, this.options.cwd);
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/**
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* Cache used to avoid operating on files that haven't changed since the
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* last successful execution (e.g., file passed linting with no errors and
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* no warnings).
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* @type {Object}
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*/
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this._fileCache = fileEntryCache.create(cacheFile);
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// load in additional rules
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if (this.options.rulePaths) {
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const cwd = this.options.cwd;
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this.options.rulePaths.forEach(function(rulesdir) {
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debug(`Loading rules from ${rulesdir}`);
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rules.load(rulesdir, cwd);
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});
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}
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Object.keys(this.options.rules || {}).forEach(function(name) {
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validator.validateRuleOptions(name, this.options.rules[name], "CLI");
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}.bind(this));
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}
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|
|
/**
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* Returns the formatter representing the given format or null if no formatter
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* with the given name can be found.
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|
* @param {string} [format] The name of the format to load or the path to a
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* custom formatter.
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* @returns {Function} The formatter function or null if not found.
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*/
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CLIEngine.getFormatter = function(format) {
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let formatterPath;
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// default is stylish
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format = format || "stylish";
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// only strings are valid formatters
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if (typeof format === "string") {
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// replace \ with / for Windows compatibility
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format = format.replace(/\\/g, "/");
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// if there's a slash, then it's a file
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if (format.indexOf("/") > -1) {
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const cwd = this.options ? this.options.cwd : process.cwd();
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formatterPath = path.resolve(cwd, format);
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} else {
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formatterPath = `./formatters/${format}`;
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}
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try {
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return require(formatterPath);
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|
} catch (ex) {
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ex.message = `There was a problem loading formatter: ${formatterPath}\nError: ${ex.message}`;
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throw ex;
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}
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} else {
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return null;
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}
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};
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/**
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* Returns results that only contains errors.
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* @param {LintResult[]} results The results to filter.
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* @returns {LintResult[]} The filtered results.
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*/
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CLIEngine.getErrorResults = function(results) {
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const filtered = [];
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results.forEach(function(result) {
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const filteredMessages = result.messages.filter(isErrorMessage);
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if (filteredMessages.length > 0) {
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filtered.push(
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Object.assign(result, {
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messages: filteredMessages,
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errorCount: filteredMessages.length,
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warningCount: 0
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})
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);
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}
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});
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return filtered;
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};
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/**
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* Outputs fixes from the given results to files.
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* @param {Object} report The report object created by CLIEngine.
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* @returns {void}
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*/
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CLIEngine.outputFixes = function(report) {
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report.results.filter(function(result) {
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return result.hasOwnProperty("output");
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}).forEach(function(result) {
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fs.writeFileSync(result.filePath, result.output);
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});
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};
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CLIEngine.prototype = {
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constructor: CLIEngine,
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/**
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* Add a plugin by passing it's configuration
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* @param {string} name Name of the plugin.
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* @param {Object} pluginobject Plugin configuration object.
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* @returns {void}
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*/
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addPlugin(name, pluginobject) {
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Plugins.define(name, pluginobject);
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},
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/**
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* Resolves the patterns passed into executeOnFiles() into glob-based patterns
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* for easier handling.
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* @param {string[]} patterns The file patterns passed on the command line.
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* @returns {string[]} The equivalent glob patterns.
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*/
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resolveFileGlobPatterns(patterns) {
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return globUtil.resolveFileGlobPatterns(patterns, this.options);
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},
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/**
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* Executes the current configuration on an array of file and directory names.
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* @param {string[]} patterns An array of file and directory names.
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* @returns {Object} The results for all files that were linted.
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*/
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executeOnFiles(patterns) {
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const results = [],
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options = this.options,
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fileCache = this._fileCache,
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configHelper = new Config(options);
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let prevConfig; // the previous configuration used
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/**
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* Calculates the hash of the config file used to validate a given file
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* @param {string} filename The path of the file to retrieve a config object for to calculate the hash
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* @returns {string} the hash of the config
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*/
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function hashOfConfigFor(filename) {
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const config = configHelper.getConfig(filename);
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if (!prevConfig) {
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prevConfig = {};
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}
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// reuse the previously hashed config if the config hasn't changed
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if (prevConfig.config !== config) {
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/*
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* config changed so we need to calculate the hash of the config
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* and the hash of the plugins being used
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*/
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prevConfig.config = config;
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const eslintVersion = pkg.version;
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prevConfig.hash = hash(`${eslintVersion}_${stringify(config)}`);
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}
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return prevConfig.hash;
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}
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/**
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* Executes the linter on a file defined by the `filename`. Skips
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* unsupported file extensions and any files that are already linted.
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* @param {string} filename The resolved filename of the file to be linted
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* @param {boolean} warnIgnored always warn when a file is ignored
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* @returns {void}
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*/
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function executeOnFile(filename, warnIgnored) {
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let hashOfConfig,
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descriptor;
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if (warnIgnored) {
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results.push(createIgnoreResult(filename, options.cwd));
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return;
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}
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if (options.cache) {
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/*
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* get the descriptor for this file
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* with the metadata and the flag that determines if
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* the file has changed
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*/
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descriptor = fileCache.getFileDescriptor(filename);
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const meta = descriptor.meta || {};
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hashOfConfig = hashOfConfigFor(filename);
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const changed = descriptor.changed || meta.hashOfConfig !== hashOfConfig;
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if (!changed) {
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debug(`Skipping file since hasn't changed: ${filename}`);
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/*
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* Add the the cached results (always will be 0 error and
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* 0 warnings). We should not cache results for files that
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* failed, in order to guarantee that next execution will
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* process those files as well.
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*/
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results.push(descriptor.meta.results);
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// move to the next file
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return;
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}
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} else {
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fileCache.destroy();
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}
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debug(`Processing ${filename}`);
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const res = processFile(filename, configHelper, options);
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if (options.cache) {
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/*
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* if a file contains errors or warnings we don't want to
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* store the file in the cache so we can guarantee that
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* next execution will also operate on this file
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*/
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if (res.errorCount > 0 || res.warningCount > 0) {
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debug(`File has problems, skipping it: ${filename}`);
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// remove the entry from the cache
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fileCache.removeEntry(filename);
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} else {
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/*
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* since the file passed we store the result here
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* TODO: check this as we might not need to store the
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* successful runs as it will always should be 0 errors and
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* 0 warnings.
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*/
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descriptor.meta.hashOfConfig = hashOfConfig;
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descriptor.meta.results = res;
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}
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}
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results.push(res);
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}
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const startTime = Date.now();
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patterns = this.resolveFileGlobPatterns(patterns);
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const fileList = globUtil.listFilesToProcess(patterns, options);
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fileList.forEach(function(fileInfo) {
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executeOnFile(fileInfo.filename, fileInfo.ignored);
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});
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const stats = calculateStatsPerRun(results);
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if (options.cache) {
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// persist the cache to disk
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fileCache.reconcile();
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}
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debug(`Linting complete in: ${Date.now() - startTime}ms`);
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return {
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results,
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errorCount: stats.errorCount,
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warningCount: stats.warningCount
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};
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},
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/**
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* Executes the current configuration on text.
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* @param {string} text A string of JavaScript code to lint.
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* @param {string} filename An optional string representing the texts filename.
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* @param {boolean} warnIgnored Always warn when a file is ignored
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* @returns {Object} The results for the linting.
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*/
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executeOnText(text, filename, warnIgnored) {
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const results = [],
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options = this.options,
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configHelper = new Config(options),
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ignoredPaths = new IgnoredPaths(options);
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// resolve filename based on options.cwd (for reporting, ignoredPaths also resolves)
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if (filename && !path.isAbsolute(filename)) {
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filename = path.resolve(options.cwd, filename);
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}
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if (filename && ignoredPaths.contains(filename)) {
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if (warnIgnored) {
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results.push(createIgnoreResult(filename, options.cwd));
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}
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} else {
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results.push(processText(text, configHelper, filename, options.fix, options.allowInlineConfig));
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}
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const stats = calculateStatsPerRun(results);
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return {
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results,
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errorCount: stats.errorCount,
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warningCount: stats.warningCount
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};
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},
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/**
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* Returns a configuration object for the given file based on the CLI options.
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* This is the same logic used by the ESLint CLI executable to determine
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* configuration for each file it processes.
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* @param {string} filePath The path of the file to retrieve a config object for.
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* @returns {Object} A configuration object for the file.
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*/
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getConfigForFile(filePath) {
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const configHelper = new Config(this.options);
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return configHelper.getConfig(filePath);
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},
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/**
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* Checks if a given path is ignored by ESLint.
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* @param {string} filePath The path of the file to check.
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* @returns {boolean} Whether or not the given path is ignored.
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*/
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isPathIgnored(filePath) {
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const resolvedPath = path.resolve(this.options.cwd, filePath);
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const ignoredPaths = new IgnoredPaths(this.options);
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return ignoredPaths.contains(resolvedPath);
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},
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getFormatter: CLIEngine.getFormatter
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};
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module.exports = CLIEngine;
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