1085 lines
42 KiB
JavaScript
1085 lines
42 KiB
JavaScript
/**
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* @fileoverview Main Linter Class
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* @author Gyandeep Singh
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const eslintScope = require("eslint-scope"),
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evk = require("eslint-visitor-keys"),
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espree = require("espree"),
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lodash = require("lodash"),
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CodePathAnalyzer = require("./code-path-analysis/code-path-analyzer"),
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ConfigOps = require("./config/config-ops"),
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validator = require("./config/config-validator"),
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Environments = require("./config/environments"),
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applyDisableDirectives = require("./util/apply-disable-directives"),
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createEmitter = require("./util/safe-emitter"),
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NodeEventGenerator = require("./util/node-event-generator"),
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SourceCode = require("./util/source-code"),
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Traverser = require("./util/traverser"),
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createReportTranslator = require("./util/report-translator"),
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Rules = require("./rules"),
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timing = require("./util/timing"),
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ConfigCommentParser = require("./util/config-comment-parser"),
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astUtils = require("./util/ast-utils"),
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pkg = require("../package.json"),
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SourceCodeFixer = require("./util/source-code-fixer");
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const debug = require("debug")("eslint:linter");
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const MAX_AUTOFIX_PASSES = 10;
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const DEFAULT_PARSER_NAME = "espree";
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const commentParser = new ConfigCommentParser();
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//------------------------------------------------------------------------------
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// Typedefs
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//------------------------------------------------------------------------------
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/**
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* The result of a parsing operation from parseForESLint()
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* @typedef {Object} CustomParseResult
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* @property {ASTNode} ast The ESTree AST Program node.
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* @property {Object} services An object containing additional services related
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* to the parser.
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* @property {ScopeManager|null} scopeManager The scope manager object of this AST.
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* @property {Object|null} visitorKeys The visitor keys to traverse this AST.
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*/
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/**
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* @typedef {Object} DisableDirective
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* @property {("disable"|"enable"|"disable-line"|"disable-next-line")} type
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* @property {number} line
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* @property {number} column
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* @property {(string|null)} ruleId
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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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* Ensures that variables representing built-in properties of the Global Object,
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* and any globals declared by special block comments, are present in the global
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* scope.
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* @param {Scope} globalScope The global scope.
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* @param {Object} configGlobals The globals declared in configuration
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* @param {{exportedVariables: Object, enabledGlobals: Object}} commentDirectives Directives from comment configuration
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* @returns {void}
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*/
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function addDeclaredGlobals(globalScope, configGlobals, commentDirectives) {
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const mergedGlobalsInfo = Object.assign(
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{},
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lodash.mapValues(configGlobals, value => ({ sourceComment: null, value: ConfigOps.normalizeConfigGlobal(value) })),
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lodash.mapValues(commentDirectives.enabledGlobals, ({ comment, value }) => ({ sourceComment: comment, value: ConfigOps.normalizeConfigGlobal(value) }))
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);
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Object.keys(mergedGlobalsInfo)
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.filter(name => mergedGlobalsInfo[name].value !== "off")
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.forEach(name => {
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let variable = globalScope.set.get(name);
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if (!variable) {
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variable = new eslintScope.Variable(name, globalScope);
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if (mergedGlobalsInfo[name].sourceComment === null) {
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variable.eslintExplicitGlobal = false;
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} else {
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variable.eslintExplicitGlobal = true;
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variable.eslintExplicitGlobalComment = mergedGlobalsInfo[name].sourceComment;
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}
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globalScope.variables.push(variable);
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globalScope.set.set(name, variable);
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}
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variable.writeable = (mergedGlobalsInfo[name].value === "writeable");
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});
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// mark all exported variables as such
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Object.keys(commentDirectives.exportedVariables).forEach(name => {
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const variable = globalScope.set.get(name);
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if (variable) {
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variable.eslintUsed = true;
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}
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});
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/*
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* "through" contains all references which definitions cannot be found.
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* Since we augment the global scope using configuration, we need to update
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* references and remove the ones that were added by configuration.
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*/
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globalScope.through = globalScope.through.filter(reference => {
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const name = reference.identifier.name;
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const variable = globalScope.set.get(name);
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if (variable) {
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/*
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* Links the variable and the reference.
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* And this reference is removed from `Scope#through`.
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*/
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reference.resolved = variable;
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variable.references.push(reference);
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return false;
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}
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return true;
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});
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}
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/**
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* Creates a collection of disable directives from a comment
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* @param {("disable"|"enable"|"disable-line"|"disable-next-line")} type The type of directive comment
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* @param {{line: number, column: number}} loc The 0-based location of the comment token
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* @param {string} value The value after the directive in the comment
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* comment specified no specific rules, so it applies to all rules (e.g. `eslint-disable`)
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* @returns {DisableDirective[]} Directives from the comment
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*/
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function createDisableDirectives(type, loc, value) {
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const ruleIds = Object.keys(commentParser.parseListConfig(value));
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const directiveRules = ruleIds.length ? ruleIds : [null];
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return directiveRules.map(ruleId => ({ type, line: loc.line, column: loc.column + 1, ruleId }));
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}
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/**
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* Parses comments in file to extract file-specific config of rules, globals
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* and environments and merges them with global config; also code blocks
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* where reporting is disabled or enabled and merges them with reporting config.
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* @param {string} filename The file being checked.
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* @param {ASTNode} ast The top node of the AST.
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* @param {function(string): {create: Function}} ruleMapper A map from rule IDs to defined rules
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* @returns {{configuredRules: Object, enabledGlobals: Object, exportedVariables: Object, problems: Problem[], disableDirectives: DisableDirective[]}}
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* A collection of the directive comments that were found, along with any problems that occurred when parsing
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*/
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function getDirectiveComments(filename, ast, ruleMapper) {
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const configuredRules = {};
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const enabledGlobals = {};
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const exportedVariables = {};
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const problems = [];
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const disableDirectives = [];
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ast.comments.filter(token => token.type !== "Shebang").forEach(comment => {
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const trimmedCommentText = comment.value.trim();
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const match = /^(eslint(-\w+){0,3}|exported|globals?)(\s|$)/u.exec(trimmedCommentText);
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if (!match) {
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return;
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}
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const directiveValue = trimmedCommentText.slice(match.index + match[1].length);
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if (/^eslint-disable-(next-)?line$/u.test(match[1])) {
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if (comment.loc.start.line === comment.loc.end.line) {
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const directiveType = match[1].slice("eslint-".length);
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disableDirectives.push(...createDisableDirectives(directiveType, comment.loc.start, directiveValue));
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} else {
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problems.push({
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ruleId: null,
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severity: 2,
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message: `${match[1]} comment should not span multiple lines.`,
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line: comment.loc.start.line,
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column: comment.loc.start.column + 1,
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endLine: comment.loc.end.line,
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endColumn: comment.loc.end.column + 1,
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nodeType: null
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});
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}
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} else if (comment.type === "Block") {
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switch (match[1]) {
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case "exported":
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Object.assign(exportedVariables, commentParser.parseStringConfig(directiveValue, comment));
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break;
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case "globals":
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case "global":
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Object.assign(enabledGlobals, commentParser.parseStringConfig(directiveValue, comment));
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break;
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case "eslint-disable":
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disableDirectives.push(...createDisableDirectives("disable", comment.loc.start, directiveValue));
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break;
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case "eslint-enable":
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disableDirectives.push(...createDisableDirectives("enable", comment.loc.start, directiveValue));
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break;
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case "eslint": {
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const parseResult = commentParser.parseJsonConfig(directiveValue, comment.loc);
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if (parseResult.success) {
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Object.keys(parseResult.config).forEach(name => {
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const ruleValue = parseResult.config[name];
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try {
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validator.validateRuleOptions(ruleMapper(name), name, ruleValue);
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} catch (err) {
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problems.push({
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ruleId: name,
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severity: 2,
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message: err.message,
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line: comment.loc.start.line,
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column: comment.loc.start.column + 1,
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endLine: comment.loc.end.line,
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endColumn: comment.loc.end.column + 1,
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nodeType: null
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});
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}
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configuredRules[name] = ruleValue;
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});
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} else {
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problems.push(parseResult.error);
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}
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break;
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}
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// no default
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}
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}
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});
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return {
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configuredRules,
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enabledGlobals,
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exportedVariables,
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problems,
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disableDirectives
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};
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}
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/**
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* Normalize ECMAScript version from the initial config
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* @param {number} ecmaVersion ECMAScript version from the initial config
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* @param {boolean} isModule Whether the source type is module or not
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* @returns {number} normalized ECMAScript version
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*/
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function normalizeEcmaVersion(ecmaVersion, isModule) {
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// Need at least ES6 for modules
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if (isModule && (!ecmaVersion || ecmaVersion < 6)) {
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return 6;
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}
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/*
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* Calculate ECMAScript edition number from official year version starting with
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* ES2015, which corresponds with ES6 (or a difference of 2009).
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*/
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if (ecmaVersion >= 2015) {
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return ecmaVersion - 2009;
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}
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return ecmaVersion;
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}
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const eslintEnvPattern = /\/\*\s*eslint-env\s(.+?)\*\//gu;
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/**
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* Checks whether or not there is a comment which has "eslint-env *" in a given text.
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* @param {string} text - A source code text to check.
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* @returns {Object|null} A result of parseListConfig() with "eslint-env *" comment.
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*/
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function findEslintEnv(text) {
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let match, retv;
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eslintEnvPattern.lastIndex = 0;
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while ((match = eslintEnvPattern.exec(text))) {
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retv = Object.assign(retv || {}, commentParser.parseListConfig(match[1]));
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}
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return retv;
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}
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/**
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* Normalizes the possible options for `linter.verify` and `linter.verifyAndFix` to a
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* consistent shape.
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* @param {(string|{reportUnusedDisableDirectives: boolean, filename: string, allowInlineConfig: boolean})} providedOptions Options
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* @returns {{reportUnusedDisableDirectives: boolean, filename: string, allowInlineConfig: boolean}} Normalized options
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*/
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function normalizeVerifyOptions(providedOptions) {
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const isObjectOptions = typeof providedOptions === "object";
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const providedFilename = isObjectOptions ? providedOptions.filename : providedOptions;
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return {
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filename: typeof providedFilename === "string" ? providedFilename : "<input>",
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allowInlineConfig: !isObjectOptions || providedOptions.allowInlineConfig !== false,
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reportUnusedDisableDirectives: isObjectOptions && !!providedOptions.reportUnusedDisableDirectives
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};
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}
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/**
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* Combines the provided parserOptions with the options from environments
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* @param {string} parserName The parser name which uses this options.
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* @param {Object} providedOptions The provided 'parserOptions' key in a config
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* @param {Environment[]} enabledEnvironments The environments enabled in configuration and with inline comments
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* @returns {Object} Resulting parser options after merge
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*/
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function resolveParserOptions(parserName, providedOptions, enabledEnvironments) {
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const parserOptionsFromEnv = enabledEnvironments
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.filter(env => env.parserOptions)
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.reduce((parserOptions, env) => ConfigOps.merge(parserOptions, env.parserOptions), {});
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const mergedParserOptions = ConfigOps.merge(parserOptionsFromEnv, providedOptions || {});
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const isModule = mergedParserOptions.sourceType === "module";
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if (isModule) {
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// can't have global return inside of modules
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mergedParserOptions.ecmaFeatures = Object.assign({}, mergedParserOptions.ecmaFeatures, { globalReturn: false });
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}
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mergedParserOptions.ecmaVersion = normalizeEcmaVersion(mergedParserOptions.ecmaVersion, isModule);
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// TODO: For backward compatibility. Will remove on v6.0.0.
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if (
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parserName === DEFAULT_PARSER_NAME &&
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mergedParserOptions.ecmaFeatures &&
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mergedParserOptions.ecmaFeatures.experimentalObjectRestSpread &&
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(!mergedParserOptions.ecmaVersion || mergedParserOptions.ecmaVersion < 9)
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) {
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mergedParserOptions.ecmaVersion = 9;
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}
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return mergedParserOptions;
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}
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/**
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* Combines the provided globals object with the globals from environments
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* @param {Object} providedGlobals The 'globals' key in a config
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* @param {Environments[]} enabledEnvironments The environments enabled in configuration and with inline comments
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* @returns {Object} The resolved globals object
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*/
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function resolveGlobals(providedGlobals, enabledEnvironments) {
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return Object.assign(
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{},
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...enabledEnvironments.filter(env => env.globals).map(env => env.globals),
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providedGlobals
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);
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}
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/**
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* Strips Unicode BOM from a given text.
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*
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* @param {string} text - A text to strip.
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* @returns {string} The stripped text.
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*/
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function stripUnicodeBOM(text) {
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/*
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* Check Unicode BOM.
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* In JavaScript, string data is stored as UTF-16, so BOM is 0xFEFF.
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* http://www.ecma-international.org/ecma-262/6.0/#sec-unicode-format-control-characters
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*/
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if (text.charCodeAt(0) === 0xFEFF) {
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return text.slice(1);
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}
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return text;
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}
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/**
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* Get the options for a rule (not including severity), if any
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* @param {Array|number} ruleConfig rule configuration
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* @returns {Array} of rule options, empty Array if none
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*/
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function getRuleOptions(ruleConfig) {
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if (Array.isArray(ruleConfig)) {
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return ruleConfig.slice(1);
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}
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return [];
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}
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/**
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* Analyze scope of the given AST.
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* @param {ASTNode} ast The `Program` node to analyze.
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* @param {Object} parserOptions The parser options.
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* @param {Object} visitorKeys The visitor keys.
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* @returns {ScopeManager} The analysis result.
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*/
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function analyzeScope(ast, parserOptions, visitorKeys) {
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const ecmaFeatures = parserOptions.ecmaFeatures || {};
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const ecmaVersion = parserOptions.ecmaVersion || 5;
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return eslintScope.analyze(ast, {
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ignoreEval: true,
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nodejsScope: ecmaFeatures.globalReturn,
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impliedStrict: ecmaFeatures.impliedStrict,
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ecmaVersion,
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sourceType: parserOptions.sourceType || "script",
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childVisitorKeys: visitorKeys || evk.KEYS,
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fallback: Traverser.getKeys
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});
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}
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|
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/**
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* Parses text into an AST. Moved out here because the try-catch prevents
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* optimization of functions, so it's best to keep the try-catch as isolated
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* as possible
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* @param {string} text The text to parse.
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* @param {Object} providedParserOptions Options to pass to the parser
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* @param {string} parserName The name of the parser
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* @param {Map<string, Object>} parserMap A map from names to loaded parsers
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* @param {string} filePath The path to the file being parsed.
|
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* @returns {{success: false, error: Problem}|{success: true, sourceCode: SourceCode}}
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* An object containing the AST and parser services if parsing was successful, or the error if parsing failed
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* @private
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*/
|
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function parse(text, providedParserOptions, parserName, parserMap, filePath) {
|
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|
|
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const textToParse = stripUnicodeBOM(text).replace(astUtils.SHEBANG_MATCHER, (match, captured) => `//${captured}`);
|
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const parserOptions = Object.assign({}, providedParserOptions, {
|
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loc: true,
|
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range: true,
|
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raw: true,
|
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tokens: true,
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comment: true,
|
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eslintVisitorKeys: true,
|
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eslintScopeManager: true,
|
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filePath
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});
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|
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let parser;
|
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|
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try {
|
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parser = parserMap.get(parserName) || require(parserName);
|
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} catch (ex) {
|
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return {
|
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success: false,
|
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error: {
|
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ruleId: null,
|
|
fatal: true,
|
|
severity: 2,
|
|
message: ex.message,
|
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line: 0,
|
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column: 0
|
|
}
|
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};
|
|
}
|
|
|
|
/*
|
|
* Check for parsing errors first. If there's a parsing error, nothing
|
|
* else can happen. However, a parsing error does not throw an error
|
|
* from this method - it's just considered a fatal error message, a
|
|
* problem that ESLint identified just like any other.
|
|
*/
|
|
try {
|
|
const parseResult = (typeof parser.parseForESLint === "function")
|
|
? parser.parseForESLint(textToParse, parserOptions)
|
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: { ast: parser.parse(textToParse, parserOptions) };
|
|
const ast = parseResult.ast;
|
|
const parserServices = parseResult.services || {};
|
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const visitorKeys = parseResult.visitorKeys || evk.KEYS;
|
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const scopeManager = parseResult.scopeManager || analyzeScope(ast, parserOptions, visitorKeys);
|
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|
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return {
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success: true,
|
|
|
|
/*
|
|
* Save all values that `parseForESLint()` returned.
|
|
* If a `SourceCode` object is given as the first parameter instead of source code text,
|
|
* linter skips the parsing process and reuses the source code object.
|
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* In that case, linter needs all the values that `parseForESLint()` returned.
|
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*/
|
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sourceCode: new SourceCode({
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text,
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ast,
|
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parserServices,
|
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scopeManager,
|
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visitorKeys
|
|
})
|
|
};
|
|
} catch (ex) {
|
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|
|
// If the message includes a leading line number, strip it:
|
|
const message = `Parsing error: ${ex.message.replace(/^line \d+:/iu, "").trim()}`;
|
|
|
|
return {
|
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success: false,
|
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error: {
|
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ruleId: null,
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fatal: true,
|
|
severity: 2,
|
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message,
|
|
line: ex.lineNumber,
|
|
column: ex.column
|
|
}
|
|
};
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets the scope for the current node
|
|
* @param {ScopeManager} scopeManager The scope manager for this AST
|
|
* @param {ASTNode} currentNode The node to get the scope of
|
|
* @returns {eslint-scope.Scope} The scope information for this node
|
|
*/
|
|
function getScope(scopeManager, currentNode) {
|
|
|
|
// On Program node, get the outermost scope to avoid return Node.js special function scope or ES modules scope.
|
|
const inner = currentNode.type !== "Program";
|
|
|
|
for (let node = currentNode; node; node = node.parent) {
|
|
const scope = scopeManager.acquire(node, inner);
|
|
|
|
if (scope) {
|
|
if (scope.type === "function-expression-name") {
|
|
return scope.childScopes[0];
|
|
}
|
|
return scope;
|
|
}
|
|
}
|
|
|
|
return scopeManager.scopes[0];
|
|
}
|
|
|
|
/**
|
|
* Marks a variable as used in the current scope
|
|
* @param {ScopeManager} scopeManager The scope manager for this AST. The scope may be mutated by this function.
|
|
* @param {ASTNode} currentNode The node currently being traversed
|
|
* @param {Object} parserOptions The options used to parse this text
|
|
* @param {string} name The name of the variable that should be marked as used.
|
|
* @returns {boolean} True if the variable was found and marked as used, false if not.
|
|
*/
|
|
function markVariableAsUsed(scopeManager, currentNode, parserOptions, name) {
|
|
const hasGlobalReturn = parserOptions.ecmaFeatures && parserOptions.ecmaFeatures.globalReturn;
|
|
const specialScope = hasGlobalReturn || parserOptions.sourceType === "module";
|
|
const currentScope = getScope(scopeManager, currentNode);
|
|
|
|
// Special Node.js scope means we need to start one level deeper
|
|
const initialScope = currentScope.type === "global" && specialScope ? currentScope.childScopes[0] : currentScope;
|
|
|
|
for (let scope = initialScope; scope; scope = scope.upper) {
|
|
const variable = scope.variables.find(scopeVar => scopeVar.name === name);
|
|
|
|
if (variable) {
|
|
variable.eslintUsed = true;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Runs a rule, and gets its listeners
|
|
* @param {Rule} rule A normalized rule with a `create` method
|
|
* @param {Context} ruleContext The context that should be passed to the rule
|
|
* @returns {Object} A map of selector listeners provided by the rule
|
|
*/
|
|
function createRuleListeners(rule, ruleContext) {
|
|
try {
|
|
return rule.create(ruleContext);
|
|
} catch (ex) {
|
|
ex.message = `Error while loading rule '${ruleContext.id}': ${ex.message}`;
|
|
throw ex;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets all the ancestors of a given node
|
|
* @param {ASTNode} node The node
|
|
* @returns {ASTNode[]} All the ancestor nodes in the AST, not including the provided node, starting
|
|
* from the root node and going inwards to the parent node.
|
|
*/
|
|
function getAncestors(node) {
|
|
const ancestorsStartingAtParent = [];
|
|
|
|
for (let ancestor = node.parent; ancestor; ancestor = ancestor.parent) {
|
|
ancestorsStartingAtParent.push(ancestor);
|
|
}
|
|
|
|
return ancestorsStartingAtParent.reverse();
|
|
}
|
|
|
|
// methods that exist on SourceCode object
|
|
const DEPRECATED_SOURCECODE_PASSTHROUGHS = {
|
|
getSource: "getText",
|
|
getSourceLines: "getLines",
|
|
getAllComments: "getAllComments",
|
|
getNodeByRangeIndex: "getNodeByRangeIndex",
|
|
getComments: "getComments",
|
|
getCommentsBefore: "getCommentsBefore",
|
|
getCommentsAfter: "getCommentsAfter",
|
|
getCommentsInside: "getCommentsInside",
|
|
getJSDocComment: "getJSDocComment",
|
|
getFirstToken: "getFirstToken",
|
|
getFirstTokens: "getFirstTokens",
|
|
getLastToken: "getLastToken",
|
|
getLastTokens: "getLastTokens",
|
|
getTokenAfter: "getTokenAfter",
|
|
getTokenBefore: "getTokenBefore",
|
|
getTokenByRangeStart: "getTokenByRangeStart",
|
|
getTokens: "getTokens",
|
|
getTokensAfter: "getTokensAfter",
|
|
getTokensBefore: "getTokensBefore",
|
|
getTokensBetween: "getTokensBetween"
|
|
};
|
|
|
|
const BASE_TRAVERSAL_CONTEXT = Object.freeze(
|
|
Object.keys(DEPRECATED_SOURCECODE_PASSTHROUGHS).reduce(
|
|
(contextInfo, methodName) =>
|
|
Object.assign(contextInfo, {
|
|
[methodName](...args) {
|
|
return this.getSourceCode()[DEPRECATED_SOURCECODE_PASSTHROUGHS[methodName]](...args);
|
|
}
|
|
}),
|
|
{}
|
|
)
|
|
);
|
|
|
|
/**
|
|
* Runs the given rules on the given SourceCode object
|
|
* @param {SourceCode} sourceCode A SourceCode object for the given text
|
|
* @param {Object} configuredRules The rules configuration
|
|
* @param {function(string): Rule} ruleMapper A mapper function from rule names to rules
|
|
* @param {Object} parserOptions The options that were passed to the parser
|
|
* @param {string} parserName The name of the parser in the config
|
|
* @param {Object} settings The settings that were enabled in the config
|
|
* @param {string} filename The reported filename of the code
|
|
* @returns {Problem[]} An array of reported problems
|
|
*/
|
|
function runRules(sourceCode, configuredRules, ruleMapper, parserOptions, parserName, settings, filename) {
|
|
const emitter = createEmitter();
|
|
const nodeQueue = [];
|
|
let currentNode = sourceCode.ast;
|
|
|
|
Traverser.traverse(sourceCode.ast, {
|
|
enter(node, parent) {
|
|
node.parent = parent;
|
|
nodeQueue.push({ isEntering: true, node });
|
|
},
|
|
leave(node) {
|
|
nodeQueue.push({ isEntering: false, node });
|
|
},
|
|
visitorKeys: sourceCode.visitorKeys
|
|
});
|
|
|
|
/*
|
|
* Create a frozen object with the ruleContext properties and methods that are shared by all rules.
|
|
* All rule contexts will inherit from this object. This avoids the performance penalty of copying all the
|
|
* properties once for each rule.
|
|
*/
|
|
const sharedTraversalContext = Object.freeze(
|
|
Object.assign(
|
|
Object.create(BASE_TRAVERSAL_CONTEXT),
|
|
{
|
|
getAncestors: () => getAncestors(currentNode),
|
|
getDeclaredVariables: sourceCode.scopeManager.getDeclaredVariables.bind(sourceCode.scopeManager),
|
|
getFilename: () => filename,
|
|
getScope: () => getScope(sourceCode.scopeManager, currentNode),
|
|
getSourceCode: () => sourceCode,
|
|
markVariableAsUsed: name => markVariableAsUsed(sourceCode.scopeManager, currentNode, parserOptions, name),
|
|
parserOptions,
|
|
parserPath: parserName,
|
|
parserServices: sourceCode.parserServices,
|
|
settings
|
|
}
|
|
)
|
|
);
|
|
|
|
|
|
const lintingProblems = [];
|
|
|
|
Object.keys(configuredRules).forEach(ruleId => {
|
|
const severity = ConfigOps.getRuleSeverity(configuredRules[ruleId]);
|
|
|
|
if (severity === 0) {
|
|
return;
|
|
}
|
|
|
|
const rule = ruleMapper(ruleId);
|
|
const messageIds = rule.meta && rule.meta.messages;
|
|
let reportTranslator = null;
|
|
const ruleContext = Object.freeze(
|
|
Object.assign(
|
|
Object.create(sharedTraversalContext),
|
|
{
|
|
id: ruleId,
|
|
options: getRuleOptions(configuredRules[ruleId]),
|
|
report(...args) {
|
|
|
|
/*
|
|
* Create a report translator lazily.
|
|
* In a vast majority of cases, any given rule reports zero errors on a given
|
|
* piece of code. Creating a translator lazily avoids the performance cost of
|
|
* creating a new translator function for each rule that usually doesn't get
|
|
* called.
|
|
*
|
|
* Using lazy report translators improves end-to-end performance by about 3%
|
|
* with Node 8.4.0.
|
|
*/
|
|
if (reportTranslator === null) {
|
|
reportTranslator = createReportTranslator({ ruleId, severity, sourceCode, messageIds });
|
|
}
|
|
const problem = reportTranslator(...args);
|
|
|
|
if (problem.fix && rule.meta && !rule.meta.fixable) {
|
|
throw new Error("Fixable rules should export a `meta.fixable` property.");
|
|
}
|
|
lintingProblems.push(problem);
|
|
}
|
|
}
|
|
)
|
|
);
|
|
|
|
const ruleListeners = createRuleListeners(rule, ruleContext);
|
|
|
|
// add all the selectors from the rule as listeners
|
|
Object.keys(ruleListeners).forEach(selector => {
|
|
emitter.on(
|
|
selector,
|
|
timing.enabled
|
|
? timing.time(ruleId, ruleListeners[selector])
|
|
: ruleListeners[selector]
|
|
);
|
|
});
|
|
});
|
|
|
|
const eventGenerator = new CodePathAnalyzer(new NodeEventGenerator(emitter));
|
|
|
|
nodeQueue.forEach(traversalInfo => {
|
|
currentNode = traversalInfo.node;
|
|
|
|
try {
|
|
if (traversalInfo.isEntering) {
|
|
eventGenerator.enterNode(currentNode);
|
|
} else {
|
|
eventGenerator.leaveNode(currentNode);
|
|
}
|
|
} catch (err) {
|
|
err.currentNode = currentNode;
|
|
throw err;
|
|
}
|
|
});
|
|
|
|
return lintingProblems;
|
|
}
|
|
|
|
const lastSourceCodes = new WeakMap();
|
|
const loadedParserMaps = new WeakMap();
|
|
const ruleMaps = new WeakMap();
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Public Interface
|
|
//------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Object that is responsible for verifying JavaScript text
|
|
* @name eslint
|
|
*/
|
|
module.exports = class Linter {
|
|
|
|
constructor() {
|
|
lastSourceCodes.set(this, null);
|
|
loadedParserMaps.set(this, new Map());
|
|
ruleMaps.set(this, new Rules());
|
|
this.version = pkg.version;
|
|
this.environments = new Environments();
|
|
|
|
this.defineParser("espree", espree);
|
|
}
|
|
|
|
/**
|
|
* Getter for package version.
|
|
* @static
|
|
* @returns {string} The version from package.json.
|
|
*/
|
|
static get version() {
|
|
return pkg.version;
|
|
}
|
|
|
|
/**
|
|
* Configuration object for the `verify` API. A JS representation of the eslintrc files.
|
|
* @typedef {Object} ESLintConfig
|
|
* @property {Object} rules The rule configuration to verify against.
|
|
* @property {string} [parser] Parser to use when generatig the AST.
|
|
* @property {Object} [parserOptions] Options for the parsed used.
|
|
* @property {Object} [settings] Global settings passed to each rule.
|
|
* @property {Object} [env] The environment to verify in.
|
|
* @property {Object} [globals] Available globals to the code.
|
|
*/
|
|
|
|
/**
|
|
* Same as linter.verify, except without support for processors.
|
|
* @param {string|SourceCode} textOrSourceCode The text to parse or a SourceCode object.
|
|
* @param {ESLintConfig} providedConfig An ESLintConfig instance to configure everything.
|
|
* @param {(string|Object)} [filenameOrOptions] The optional filename of the file being checked.
|
|
* If this is not set, the filename will default to '<input>' in the rule context. If
|
|
* an object, then it has "filename", "saveState", and "allowInlineConfig" properties.
|
|
* @param {boolean} [filenameOrOptions.allowInlineConfig=true] Allow/disallow inline comments' ability to change config once it is set. Defaults to true if not supplied.
|
|
* Useful if you want to validate JS without comments overriding rules.
|
|
* @param {boolean} [filenameOrOptions.reportUnusedDisableDirectives=false] Adds reported errors for unused
|
|
* eslint-disable directives
|
|
* @returns {Object[]} The results as an array of messages or an empty array if no messages.
|
|
*/
|
|
_verifyWithoutProcessors(textOrSourceCode, providedConfig, filenameOrOptions) {
|
|
const config = providedConfig || {};
|
|
const options = normalizeVerifyOptions(filenameOrOptions);
|
|
let text;
|
|
|
|
// evaluate arguments
|
|
if (typeof textOrSourceCode === "string") {
|
|
lastSourceCodes.set(this, null);
|
|
text = textOrSourceCode;
|
|
} else {
|
|
lastSourceCodes.set(this, textOrSourceCode);
|
|
text = textOrSourceCode.text;
|
|
}
|
|
|
|
// search and apply "eslint-env *".
|
|
const envInFile = findEslintEnv(text);
|
|
const resolvedEnvConfig = Object.assign({ builtin: true }, config.env, envInFile);
|
|
const enabledEnvs = Object.keys(resolvedEnvConfig)
|
|
.filter(envName => resolvedEnvConfig[envName])
|
|
.map(envName => this.environments.get(envName))
|
|
.filter(env => env);
|
|
|
|
const parserName = config.parser || DEFAULT_PARSER_NAME;
|
|
const parserOptions = resolveParserOptions(parserName, config.parserOptions || {}, enabledEnvs);
|
|
const configuredGlobals = resolveGlobals(config.globals || {}, enabledEnvs);
|
|
const settings = config.settings || {};
|
|
|
|
if (!lastSourceCodes.get(this)) {
|
|
const parseResult = parse(
|
|
text,
|
|
parserOptions,
|
|
parserName,
|
|
loadedParserMaps.get(this),
|
|
options.filename
|
|
);
|
|
|
|
if (!parseResult.success) {
|
|
return [parseResult.error];
|
|
}
|
|
|
|
lastSourceCodes.set(this, parseResult.sourceCode);
|
|
} else {
|
|
|
|
/*
|
|
* If the given source code object as the first argument does not have scopeManager, analyze the scope.
|
|
* This is for backward compatibility (SourceCode is frozen so it cannot rebind).
|
|
*/
|
|
const lastSourceCode = lastSourceCodes.get(this);
|
|
|
|
if (!lastSourceCode.scopeManager) {
|
|
lastSourceCodes.set(this, new SourceCode({
|
|
text: lastSourceCode.text,
|
|
ast: lastSourceCode.ast,
|
|
parserServices: lastSourceCode.parserServices,
|
|
visitorKeys: lastSourceCode.visitorKeys,
|
|
scopeManager: analyzeScope(lastSourceCode.ast, parserOptions)
|
|
}));
|
|
}
|
|
}
|
|
|
|
const sourceCode = lastSourceCodes.get(this);
|
|
const commentDirectives = options.allowInlineConfig
|
|
? getDirectiveComments(options.filename, sourceCode.ast, ruleId => ruleMaps.get(this).get(ruleId))
|
|
: { configuredRules: {}, enabledGlobals: {}, exportedVariables: {}, problems: [], disableDirectives: [] };
|
|
|
|
// augment global scope with declared global variables
|
|
addDeclaredGlobals(
|
|
sourceCode.scopeManager.scopes[0],
|
|
configuredGlobals,
|
|
{ exportedVariables: commentDirectives.exportedVariables, enabledGlobals: commentDirectives.enabledGlobals }
|
|
);
|
|
|
|
const configuredRules = Object.assign({}, config.rules, commentDirectives.configuredRules);
|
|
|
|
let lintingProblems;
|
|
|
|
try {
|
|
lintingProblems = runRules(
|
|
sourceCode,
|
|
configuredRules,
|
|
ruleId => ruleMaps.get(this).get(ruleId),
|
|
parserOptions,
|
|
parserName,
|
|
settings,
|
|
options.filename
|
|
);
|
|
} catch (err) {
|
|
err.message += `\nOccurred while linting ${options.filename}`;
|
|
debug("An error occurred while traversing");
|
|
debug("Filename:", options.filename);
|
|
if (err.currentNode) {
|
|
const { line } = err.currentNode.loc.start;
|
|
|
|
debug("Line:", line);
|
|
err.message += `:${line}`;
|
|
}
|
|
debug("Parser Options:", parserOptions);
|
|
debug("Parser Path:", parserName);
|
|
debug("Settings:", settings);
|
|
throw err;
|
|
}
|
|
|
|
return applyDisableDirectives({
|
|
directives: commentDirectives.disableDirectives,
|
|
problems: lintingProblems
|
|
.concat(commentDirectives.problems)
|
|
.sort((problemA, problemB) => problemA.line - problemB.line || problemA.column - problemB.column),
|
|
reportUnusedDisableDirectives: options.reportUnusedDisableDirectives
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Verifies the text against the rules specified by the second argument.
|
|
* @param {string|SourceCode} textOrSourceCode The text to parse or a SourceCode object.
|
|
* @param {ESLintConfig} config An ESLintConfig instance to configure everything.
|
|
* @param {(string|Object)} [filenameOrOptions] The optional filename of the file being checked.
|
|
* If this is not set, the filename will default to '<input>' in the rule context. If
|
|
* an object, then it has "filename", "saveState", and "allowInlineConfig" properties.
|
|
* @param {boolean} [filenameOrOptions.allowInlineConfig] Allow/disallow inline comments' ability to change config once it is set. Defaults to true if not supplied.
|
|
* Useful if you want to validate JS without comments overriding rules.
|
|
* @param {function(string): string[]} [filenameOrOptions.preprocess] preprocessor for source text. If provided,
|
|
* this should accept a string of source text, and return an array of code blocks to lint.
|
|
* @param {function(Array<Object[]>): Object[]} [filenameOrOptions.postprocess] postprocessor for report messages. If provided,
|
|
* this should accept an array of the message lists for each code block returned from the preprocessor,
|
|
* apply a mapping to the messages as appropriate, and return a one-dimensional array of messages
|
|
* @returns {Object[]} The results as an array of messages or an empty array if no messages.
|
|
*/
|
|
verify(textOrSourceCode, config, filenameOrOptions) {
|
|
const preprocess = filenameOrOptions && filenameOrOptions.preprocess || (rawText => [rawText]);
|
|
const postprocess = filenameOrOptions && filenameOrOptions.postprocess || lodash.flatten;
|
|
|
|
return postprocess(
|
|
preprocess(textOrSourceCode).map(
|
|
textBlock => this._verifyWithoutProcessors(textBlock, config, filenameOrOptions)
|
|
)
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Gets the SourceCode object representing the parsed source.
|
|
* @returns {SourceCode} The SourceCode object.
|
|
*/
|
|
getSourceCode() {
|
|
return lastSourceCodes.get(this);
|
|
}
|
|
|
|
/**
|
|
* Defines a new linting rule.
|
|
* @param {string} ruleId A unique rule identifier
|
|
* @param {Function} ruleModule Function from context to object mapping AST node types to event handlers
|
|
* @returns {void}
|
|
*/
|
|
defineRule(ruleId, ruleModule) {
|
|
ruleMaps.get(this).define(ruleId, ruleModule);
|
|
}
|
|
|
|
/**
|
|
* Defines many new linting rules.
|
|
* @param {Object} rulesToDefine map from unique rule identifier to rule
|
|
* @returns {void}
|
|
*/
|
|
defineRules(rulesToDefine) {
|
|
Object.getOwnPropertyNames(rulesToDefine).forEach(ruleId => {
|
|
this.defineRule(ruleId, rulesToDefine[ruleId]);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Gets an object with all loaded rules.
|
|
* @returns {Map} All loaded rules
|
|
*/
|
|
getRules() {
|
|
return ruleMaps.get(this).getAllLoadedRules();
|
|
}
|
|
|
|
/**
|
|
* Define a new parser module
|
|
* @param {any} parserId Name of the parser
|
|
* @param {any} parserModule The parser object
|
|
* @returns {void}
|
|
*/
|
|
defineParser(parserId, parserModule) {
|
|
loadedParserMaps.get(this).set(parserId, parserModule);
|
|
}
|
|
|
|
/**
|
|
* Performs multiple autofix passes over the text until as many fixes as possible
|
|
* have been applied.
|
|
* @param {string} text The source text to apply fixes to.
|
|
* @param {Object} config The ESLint config object to use.
|
|
* @param {Object} options The ESLint options object to use.
|
|
* @param {string} options.filename The filename from which the text was read.
|
|
* @param {boolean} options.allowInlineConfig Flag indicating if inline comments
|
|
* should be allowed.
|
|
* @param {boolean|Function} options.fix Determines whether fixes should be applied
|
|
* @param {Function} options.preprocess preprocessor for source text. If provided, this should
|
|
* accept a string of source text, and return an array of code blocks to lint.
|
|
* @param {Function} options.postprocess postprocessor for report messages. If provided,
|
|
* this should accept an array of the message lists for each code block returned from the preprocessor,
|
|
* apply a mapping to the messages as appropriate, and return a one-dimensional array of messages
|
|
* @returns {Object} The result of the fix operation as returned from the
|
|
* SourceCodeFixer.
|
|
*/
|
|
verifyAndFix(text, config, options) {
|
|
let messages = [],
|
|
fixedResult,
|
|
fixed = false,
|
|
passNumber = 0,
|
|
currentText = text;
|
|
const debugTextDescription = options && options.filename || `${text.slice(0, 10)}...`;
|
|
const shouldFix = options && typeof options.fix !== "undefined" ? options.fix : true;
|
|
|
|
/**
|
|
* This loop continues until one of the following is true:
|
|
*
|
|
* 1. No more fixes have been applied.
|
|
* 2. Ten passes have been made.
|
|
*
|
|
* That means anytime a fix is successfully applied, there will be another pass.
|
|
* Essentially, guaranteeing a minimum of two passes.
|
|
*/
|
|
do {
|
|
passNumber++;
|
|
|
|
debug(`Linting code for ${debugTextDescription} (pass ${passNumber})`);
|
|
messages = this.verify(currentText, config, options);
|
|
|
|
debug(`Generating fixed text for ${debugTextDescription} (pass ${passNumber})`);
|
|
fixedResult = SourceCodeFixer.applyFixes(currentText, messages, shouldFix);
|
|
|
|
/*
|
|
* stop if there are any syntax errors.
|
|
* 'fixedResult.output' is a empty string.
|
|
*/
|
|
if (messages.length === 1 && messages[0].fatal) {
|
|
break;
|
|
}
|
|
|
|
// keep track if any fixes were ever applied - important for return value
|
|
fixed = fixed || fixedResult.fixed;
|
|
|
|
// update to use the fixed output instead of the original text
|
|
currentText = fixedResult.output;
|
|
|
|
} while (
|
|
fixedResult.fixed &&
|
|
passNumber < MAX_AUTOFIX_PASSES
|
|
);
|
|
|
|
/*
|
|
* If the last result had fixes, we need to lint again to be sure we have
|
|
* the most up-to-date information.
|
|
*/
|
|
if (fixedResult.fixed) {
|
|
fixedResult.messages = this.verify(currentText, config, options);
|
|
}
|
|
|
|
// ensure the last result properly reflects if fixes were done
|
|
fixedResult.fixed = fixed;
|
|
fixedResult.output = currentText;
|
|
|
|
return fixedResult;
|
|
}
|
|
};
|