1124 lines
41 KiB
JavaScript
1124 lines
41 KiB
JavaScript
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/**
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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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levn = require("levn"),
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lodash = require("lodash"),
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blankScriptAST = require("../conf/blank-script.json"),
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defaultConfig = require("../conf/default-config-options.js"),
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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("./report-translator"),
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Rules = require("./rules"),
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timing = require("./timing"),
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astUtils = require("./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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//------------------------------------------------------------------------------
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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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*/
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Parses a list of "name:boolean_value" or/and "name" options divided by comma or
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* whitespace.
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* @param {string} string The string to parse.
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* @param {Comment} comment The comment node which has the string.
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* @returns {Object} Result map object of names and boolean values
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*/
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function parseBooleanConfig(string, comment) {
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const items = {};
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// Collapse whitespace around `:` and `,` to make parsing easier
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string = string.replace(/\s*([:,])\s*/g, "$1");
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string.split(/\s|,+/).forEach(name => {
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if (!name) {
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return;
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}
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const pos = name.indexOf(":");
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let value;
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if (pos !== -1) {
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value = name.slice(pos + 1);
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name = name.slice(0, pos);
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}
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items[name] = {
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value: (value === "true"),
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comment
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};
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});
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return items;
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}
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/**
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* Parses a JSON-like config.
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* @param {string} string The string to parse.
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* @param {Object} location Start line and column of comments for potential error message.
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* @returns {({success: true, config: Object}|{success: false, error: Problem})} Result map object
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*/
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function parseJsonConfig(string, location) {
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let items = {};
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// Parses a JSON-like comment by the same way as parsing CLI option.
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try {
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items = levn.parse("Object", string) || {};
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// Some tests say that it should ignore invalid comments such as `/*eslint no-alert:abc*/`.
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// Also, commaless notations have invalid severity:
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// "no-alert: 2 no-console: 2" --> {"no-alert": "2 no-console: 2"}
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// Should ignore that case as well.
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if (ConfigOps.isEverySeverityValid(items)) {
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return {
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success: true,
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config: items
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};
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}
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} catch (ex) {
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// ignore to parse the string by a fallback.
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}
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/*
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* Optionator cannot parse commaless notations.
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* But we are supporting that. So this is a fallback for that.
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*/
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items = {};
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string = string.replace(/([a-zA-Z0-9\-/]+):/g, "\"$1\":").replace(/(]|[0-9])\s+(?=")/, "$1,");
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try {
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items = JSON.parse(`{${string}}`);
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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,
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fatal: true,
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severity: 2,
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source: null,
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message: `Failed to parse JSON from '${string}': ${ex.message}`,
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line: location.start.line,
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column: location.start.column + 1
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}
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};
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}
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return {
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success: true,
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config: items
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};
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}
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/**
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* Parses a config of values separated by comma.
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* @param {string} string The string to parse.
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* @returns {Object} Result map of values and true values
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*/
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function parseListConfig(string) {
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const items = {};
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// Collapse whitespace around ,
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string = string.replace(/\s*,\s*/g, ",");
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string.split(/,+/).forEach(name => {
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name = name.trim();
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if (!name) {
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return;
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}
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items[name] = true;
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});
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return items;
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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} config The existing configuration data.
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* @param {Environments} envContext Env context
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* @returns {void}
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*/
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function addDeclaredGlobals(globalScope, config, envContext) {
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const declaredGlobals = {},
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exportedGlobals = {},
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explicitGlobals = {},
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builtin = envContext.get("builtin");
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Object.assign(declaredGlobals, builtin);
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Object.keys(config.env).filter(name => config.env[name]).forEach(name => {
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const env = envContext.get(name),
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environmentGlobals = env && env.globals;
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if (environmentGlobals) {
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Object.assign(declaredGlobals, environmentGlobals);
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}
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});
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Object.assign(exportedGlobals, config.exported);
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Object.assign(declaredGlobals, config.globals);
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Object.assign(explicitGlobals, config.astGlobals);
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Object.keys(declaredGlobals).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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variable.eslintExplicitGlobal = false;
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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 = declaredGlobals[name];
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});
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Object.keys(explicitGlobals).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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variable.eslintExplicitGlobal = true;
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variable.eslintExplicitGlobalComment = explicitGlobals[name].comment;
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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 = explicitGlobals[name].value;
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});
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// mark all exported variables as such
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Object.keys(exportedGlobals).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 {{
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* type: ("disable"|"enable"|"disable-line"|"disable-next-line"),
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* line: number,
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* column: number,
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* ruleId: (string|null)
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* }[]} 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(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 {Object} config The existing configuration data.
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* @param {function(string): {create: Function}} ruleMapper A map from rule IDs to defined rules
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* @returns {{
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* config: Object,
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* problems: Problem[],
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* disableDirectives: {
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* type: ("disable"|"enable"|"disable-line"|"disable-next-line"),
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* line: number,
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* column: number,
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* ruleId: (string|null)
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* }[]
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* }} Modified config object, along with any problems encountered
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* while parsing config comments
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*/
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function modifyConfigsFromComments(filename, ast, config, ruleMapper) {
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const commentConfig = {
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exported: {},
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astGlobals: {},
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rules: {},
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env: {}
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};
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const commentRules = {};
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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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let value = comment.value.trim();
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const match = /^(eslint(-\w+){0,3}|exported|globals?)(\s|$)/.exec(value);
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if (match) {
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value = value.slice(match.index + match[1].length);
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if (comment.type === "Block") {
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switch (match[1]) {
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case "exported":
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Object.assign(commentConfig.exported, parseBooleanConfig(value, comment));
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break;
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case "globals":
|
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case "global":
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Object.assign(commentConfig.astGlobals, parseBooleanConfig(value, comment));
|
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break;
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case "eslint-disable":
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[].push.apply(disableDirectives, createDisableDirectives("disable", comment.loc.start, value));
|
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break;
|
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case "eslint-enable":
|
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[].push.apply(disableDirectives, createDisableDirectives("enable", comment.loc.start, value));
|
||
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break;
|
||
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|
||
|
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case "eslint": {
|
||
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const parseResult = parseJsonConfig(value, comment.loc);
|
||
|
|
|
||
|
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if (parseResult.success) {
|
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Object.keys(parseResult.config).forEach(name => {
|
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|
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const ruleValue = parseResult.config[name];
|
||
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|
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validator.validateRuleOptions(ruleMapper(name), name, ruleValue, `${filename} line ${comment.loc.start.line}`);
|
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commentRules[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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|
||
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break;
|
||
|
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}
|
||
|
|
|
||
|
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// no default
|
||
|
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}
|
||
|
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} else { // comment.type === "Line"
|
||
|
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if (match[1] === "eslint-disable-line") {
|
||
|
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[].push.apply(disableDirectives, createDisableDirectives("disable-line", comment.loc.start, value));
|
||
|
|
} else if (match[1] === "eslint-disable-next-line") {
|
||
|
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[].push.apply(disableDirectives, createDisableDirectives("disable-next-line", comment.loc.start, value));
|
||
|
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}
|
||
|
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}
|
||
|
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}
|
||
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});
|
||
|
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|
||
|
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Object.assign(commentConfig.rules, commentRules);
|
||
|
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|
||
|
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return {
|
||
|
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config: ConfigOps.merge(config, commentConfig),
|
||
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problems,
|
||
|
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disableDirectives
|
||
|
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};
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Normalize ECMAScript version from the initial config
|
||
|
|
* @param {number} ecmaVersion ECMAScript version from the initial config
|
||
|
|
* @param {boolean} isModule Whether the source type is module or not
|
||
|
|
* @returns {number} normalized ECMAScript version
|
||
|
|
*/
|
||
|
|
function normalizeEcmaVersion(ecmaVersion, isModule) {
|
||
|
|
|
||
|
|
// Need at least ES6 for modules
|
||
|
|
if (isModule && (!ecmaVersion || ecmaVersion < 6)) {
|
||
|
|
ecmaVersion = 6;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Calculate ECMAScript edition number from official year version starting with
|
||
|
|
* ES2015, which corresponds with ES6 (or a difference of 2009).
|
||
|
|
*/
|
||
|
|
if (ecmaVersion >= 2015) {
|
||
|
|
ecmaVersion -= 2009;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ecmaVersion;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Process initial config to make it safe to extend by file comment config
|
||
|
|
* @param {Object} config Initial config
|
||
|
|
* @param {Environments} envContext Env context
|
||
|
|
* @returns {Object} Processed config
|
||
|
|
*/
|
||
|
|
function prepareConfig(config, envContext) {
|
||
|
|
config.globals = config.globals || {};
|
||
|
|
const copiedRules = {};
|
||
|
|
let parserOptions = {};
|
||
|
|
|
||
|
|
if (typeof config.rules === "object") {
|
||
|
|
Object.keys(config.rules).forEach(k => {
|
||
|
|
const rule = config.rules[k];
|
||
|
|
|
||
|
|
if (rule === null) {
|
||
|
|
throw new Error(`Invalid config for rule '${k}'.`);
|
||
|
|
}
|
||
|
|
if (Array.isArray(rule)) {
|
||
|
|
copiedRules[k] = rule.slice();
|
||
|
|
} else {
|
||
|
|
copiedRules[k] = rule;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
// merge in environment parserOptions
|
||
|
|
if (typeof config.env === "object") {
|
||
|
|
Object.keys(config.env).forEach(envName => {
|
||
|
|
const env = envContext.get(envName);
|
||
|
|
|
||
|
|
if (config.env[envName] && env && env.parserOptions) {
|
||
|
|
parserOptions = ConfigOps.merge(parserOptions, env.parserOptions);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
const preparedConfig = {
|
||
|
|
rules: copiedRules,
|
||
|
|
parser: config.parser || defaultConfig.parser,
|
||
|
|
globals: ConfigOps.merge(defaultConfig.globals, config.globals),
|
||
|
|
env: ConfigOps.merge(defaultConfig.env, config.env || {}),
|
||
|
|
settings: ConfigOps.merge(defaultConfig.settings, config.settings || {}),
|
||
|
|
parserOptions: ConfigOps.merge(parserOptions, config.parserOptions || {})
|
||
|
|
};
|
||
|
|
const isModule = preparedConfig.parserOptions.sourceType === "module";
|
||
|
|
|
||
|
|
if (isModule) {
|
||
|
|
|
||
|
|
// can't have global return inside of modules
|
||
|
|
preparedConfig.parserOptions.ecmaFeatures = Object.assign({}, preparedConfig.parserOptions.ecmaFeatures, { globalReturn: false });
|
||
|
|
}
|
||
|
|
|
||
|
|
preparedConfig.parserOptions.ecmaVersion = normalizeEcmaVersion(preparedConfig.parserOptions.ecmaVersion, isModule);
|
||
|
|
|
||
|
|
return preparedConfig;
|
||
|
|
}
|
||
|
|
|
||
|
|
const eslintEnvPattern = /\/\*\s*eslint-env\s(.+?)\*\//g;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks whether or not there is a comment which has "eslint-env *" in a given text.
|
||
|
|
* @param {string} text - A source code text to check.
|
||
|
|
* @returns {Object|null} A result of parseListConfig() with "eslint-env *" comment.
|
||
|
|
*/
|
||
|
|
function findEslintEnv(text) {
|
||
|
|
let match, retv;
|
||
|
|
|
||
|
|
eslintEnvPattern.lastIndex = 0;
|
||
|
|
|
||
|
|
while ((match = eslintEnvPattern.exec(text))) {
|
||
|
|
retv = Object.assign(retv || {}, parseListConfig(match[1]));
|
||
|
|
}
|
||
|
|
|
||
|
|
return retv;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Strips Unicode BOM from a given text.
|
||
|
|
*
|
||
|
|
* @param {string} text - A text to strip.
|
||
|
|
* @returns {string} The stripped text.
|
||
|
|
*/
|
||
|
|
function stripUnicodeBOM(text) {
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Check Unicode BOM.
|
||
|
|
* In JavaScript, string data is stored as UTF-16, so BOM is 0xFEFF.
|
||
|
|
* http://www.ecma-international.org/ecma-262/6.0/#sec-unicode-format-control-characters
|
||
|
|
*/
|
||
|
|
if (text.charCodeAt(0) === 0xFEFF) {
|
||
|
|
return text.slice(1);
|
||
|
|
}
|
||
|
|
return text;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get the options for a rule (not including severity), if any
|
||
|
|
* @param {Array|number} ruleConfig rule configuration
|
||
|
|
* @returns {Array} of rule options, empty Array if none
|
||
|
|
*/
|
||
|
|
function getRuleOptions(ruleConfig) {
|
||
|
|
if (Array.isArray(ruleConfig)) {
|
||
|
|
return ruleConfig.slice(1);
|
||
|
|
}
|
||
|
|
return [];
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Parses text into an AST. Moved out here because the try-catch prevents
|
||
|
|
* optimization of functions, so it's best to keep the try-catch as isolated
|
||
|
|
* as possible
|
||
|
|
* @param {string} text The text to parse.
|
||
|
|
* @param {Object} providedParserOptions Options to pass to the parser
|
||
|
|
* @param {Object} parser The parser module
|
||
|
|
* @param {string} filePath The path to the file being parsed.
|
||
|
|
* @returns {{success: false, error: Problem}|{success: true,ast: ASTNode, services: Object}}
|
||
|
|
* An object containing the AST and parser services if parsing was successful, or the error if parsing failed
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
function parse(text, providedParserOptions, parser, filePath) {
|
||
|
|
|
||
|
|
const parserOptions = Object.assign({}, providedParserOptions, {
|
||
|
|
loc: true,
|
||
|
|
range: true,
|
||
|
|
raw: true,
|
||
|
|
tokens: true,
|
||
|
|
comment: true,
|
||
|
|
filePath
|
||
|
|
});
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 {
|
||
|
|
if (typeof parser.parseForESLint === "function") {
|
||
|
|
const parseResult = parser.parseForESLint(text, parserOptions);
|
||
|
|
|
||
|
|
return {
|
||
|
|
success: true,
|
||
|
|
ast: parseResult.ast,
|
||
|
|
services: parseResult.services || {}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
return {
|
||
|
|
success: true,
|
||
|
|
ast: parser.parse(text, parserOptions),
|
||
|
|
services: {}
|
||
|
|
};
|
||
|
|
} catch (ex) {
|
||
|
|
|
||
|
|
// If the message includes a leading line number, strip it:
|
||
|
|
const message = `Parsing error: ${ex.message.replace(/^line \d+:/i, "").trim()}`;
|
||
|
|
const source = ex.lineNumber ? SourceCode.splitLines(text)[ex.lineNumber - 1] : null;
|
||
|
|
|
||
|
|
return {
|
||
|
|
success: false,
|
||
|
|
error: {
|
||
|
|
ruleId: null,
|
||
|
|
fatal: true,
|
||
|
|
severity: 2,
|
||
|
|
source,
|
||
|
|
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
|
||
|
|
* @param {number} ecmaVersion The `ecmaVersion` setting that this code was parsed with
|
||
|
|
* @returns {eslint-scope.Scope} The scope information for this node
|
||
|
|
*/
|
||
|
|
function getScope(scopeManager, currentNode, ecmaVersion) {
|
||
|
|
let initialNode;
|
||
|
|
|
||
|
|
// if current node introduces a scope, add it to the list
|
||
|
|
if (
|
||
|
|
["FunctionDeclaration", "FunctionExpression", "ArrowFunctionExpression"].indexOf(currentNode.type) >= 0 ||
|
||
|
|
ecmaVersion >= 6 && ["BlockStatement", "SwitchStatement", "CatchClause"].indexOf(currentNode.type) >= 0
|
||
|
|
) {
|
||
|
|
initialNode = currentNode;
|
||
|
|
} else {
|
||
|
|
initialNode = currentNode.parent;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ascend the current node's parents
|
||
|
|
for (let node = initialNode; node; node = node.parent) {
|
||
|
|
|
||
|
|
// Get the innermost scope
|
||
|
|
const scope = scopeManager.acquire(node, true);
|
||
|
|
|
||
|
|
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, parserOptions.ecmaVersion);
|
||
|
|
|
||
|
|
// 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;
|
||
|
|
}
|
||
|
|
|
||
|
|
// 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]() {
|
||
|
|
const sourceCode = this.getSourceCode();
|
||
|
|
|
||
|
|
return sourceCode[DEPRECATED_SOURCECODE_PASSTHROUGHS[methodName]].apply(sourceCode, arguments);
|
||
|
|
}
|
||
|
|
}),
|
||
|
|
{}
|
||
|
|
)
|
||
|
|
);
|
||
|
|
|
||
|
|
const lastSourceCodes = new WeakMap();
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Public Interface
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Object that is responsible for verifying JavaScript text
|
||
|
|
* @name eslint
|
||
|
|
*/
|
||
|
|
module.exports = class Linter {
|
||
|
|
|
||
|
|
constructor() {
|
||
|
|
lastSourceCodes.set(this, null);
|
||
|
|
this.version = pkg.version;
|
||
|
|
|
||
|
|
this.rules = new Rules();
|
||
|
|
this._parsers = new Map();
|
||
|
|
this.environments = new Environments();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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} 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=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 null if no messages.
|
||
|
|
*/
|
||
|
|
_verifyWithoutProcessors(textOrSourceCode, config, filenameOrOptions) {
|
||
|
|
let text,
|
||
|
|
parserServices,
|
||
|
|
allowInlineConfig,
|
||
|
|
providedFilename,
|
||
|
|
reportUnusedDisableDirectives;
|
||
|
|
|
||
|
|
// evaluate arguments
|
||
|
|
if (typeof filenameOrOptions === "object") {
|
||
|
|
providedFilename = filenameOrOptions.filename;
|
||
|
|
allowInlineConfig = filenameOrOptions.allowInlineConfig;
|
||
|
|
reportUnusedDisableDirectives = filenameOrOptions.reportUnusedDisableDirectives;
|
||
|
|
} else {
|
||
|
|
providedFilename = filenameOrOptions;
|
||
|
|
}
|
||
|
|
|
||
|
|
const filename = typeof providedFilename === "string" ? providedFilename : "<input>";
|
||
|
|
|
||
|
|
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);
|
||
|
|
|
||
|
|
config = Object.assign({}, config);
|
||
|
|
|
||
|
|
if (envInFile) {
|
||
|
|
if (config.env) {
|
||
|
|
config.env = Object.assign({}, config.env, envInFile);
|
||
|
|
} else {
|
||
|
|
config.env = envInFile;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// process initial config to make it safe to extend
|
||
|
|
config = prepareConfig(config, this.environments);
|
||
|
|
|
||
|
|
if (lastSourceCodes.get(this)) {
|
||
|
|
parserServices = {};
|
||
|
|
} else {
|
||
|
|
|
||
|
|
// there's no input, just exit here
|
||
|
|
if (text.trim().length === 0) {
|
||
|
|
lastSourceCodes.set(this, new SourceCode(text, blankScriptAST));
|
||
|
|
return [];
|
||
|
|
}
|
||
|
|
|
||
|
|
let parser;
|
||
|
|
|
||
|
|
try {
|
||
|
|
parser = this._parsers.get(config.parser) || require(config.parser);
|
||
|
|
} catch (ex) {
|
||
|
|
return [{
|
||
|
|
ruleId: null,
|
||
|
|
fatal: true,
|
||
|
|
severity: 2,
|
||
|
|
source: null,
|
||
|
|
message: ex.message,
|
||
|
|
line: 0,
|
||
|
|
column: 0
|
||
|
|
}];
|
||
|
|
}
|
||
|
|
const parseResult = parse(
|
||
|
|
stripUnicodeBOM(text).replace(astUtils.SHEBANG_MATCHER, (match, captured) => `//${captured}`),
|
||
|
|
config.parserOptions,
|
||
|
|
parser,
|
||
|
|
filename
|
||
|
|
);
|
||
|
|
|
||
|
|
if (!parseResult.success) {
|
||
|
|
return [parseResult.error];
|
||
|
|
}
|
||
|
|
|
||
|
|
parserServices = parseResult.services;
|
||
|
|
lastSourceCodes.set(this, new SourceCode(text, parseResult.ast));
|
||
|
|
}
|
||
|
|
|
||
|
|
const problems = [];
|
||
|
|
const sourceCode = lastSourceCodes.get(this);
|
||
|
|
let disableDirectives;
|
||
|
|
|
||
|
|
// parse global comments and modify config
|
||
|
|
if (allowInlineConfig !== false) {
|
||
|
|
const modifyConfigResult = modifyConfigsFromComments(filename, sourceCode.ast, config, ruleId => this.rules.get(ruleId));
|
||
|
|
|
||
|
|
config = modifyConfigResult.config;
|
||
|
|
modifyConfigResult.problems.forEach(problem => problems.push(problem));
|
||
|
|
disableDirectives = modifyConfigResult.disableDirectives;
|
||
|
|
} else {
|
||
|
|
disableDirectives = [];
|
||
|
|
}
|
||
|
|
|
||
|
|
const emitter = createEmitter();
|
||
|
|
const traverser = new Traverser();
|
||
|
|
const ecmaFeatures = config.parserOptions.ecmaFeatures || {};
|
||
|
|
const ecmaVersion = config.parserOptions.ecmaVersion || 5;
|
||
|
|
const scopeManager = eslintScope.analyze(sourceCode.ast, {
|
||
|
|
ignoreEval: true,
|
||
|
|
nodejsScope: ecmaFeatures.globalReturn,
|
||
|
|
impliedStrict: ecmaFeatures.impliedStrict,
|
||
|
|
ecmaVersion,
|
||
|
|
sourceType: config.parserOptions.sourceType || "script",
|
||
|
|
fallback: Traverser.getKeys
|
||
|
|
});
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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: () => traverser.parents(),
|
||
|
|
getDeclaredVariables: scopeManager.getDeclaredVariables.bind(scopeManager),
|
||
|
|
getFilename: () => filename,
|
||
|
|
getScope: () => getScope(scopeManager, traverser.current(), config.parserOptions.ecmaVersion),
|
||
|
|
getSourceCode: () => sourceCode,
|
||
|
|
markVariableAsUsed: name => markVariableAsUsed(scopeManager, traverser.current(), config.parserOptions, name),
|
||
|
|
parserOptions: config.parserOptions,
|
||
|
|
parserPath: config.parser,
|
||
|
|
parserServices,
|
||
|
|
settings: config.settings,
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This is used to avoid breaking rules that used to monkeypatch the `Linter#report` method
|
||
|
|
* by using the `_linter` property on rule contexts.
|
||
|
|
*
|
||
|
|
* This should be removed in a major release after we create a better way to
|
||
|
|
* lint for unused disable comments.
|
||
|
|
* https://github.com/eslint/eslint/issues/9193
|
||
|
|
*/
|
||
|
|
_linter: {
|
||
|
|
report() {},
|
||
|
|
on: emitter.on
|
||
|
|
}
|
||
|
|
}
|
||
|
|
)
|
||
|
|
);
|
||
|
|
|
||
|
|
// enable appropriate rules
|
||
|
|
Object.keys(config.rules).forEach(ruleId => {
|
||
|
|
const severity = ConfigOps.getRuleSeverity(config.rules[ruleId]);
|
||
|
|
|
||
|
|
if (severity === 0) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
const rule = this.rules.get(ruleId);
|
||
|
|
let reportTranslator = null;
|
||
|
|
const ruleContext = Object.freeze(
|
||
|
|
Object.assign(
|
||
|
|
Object.create(sharedTraversalContext),
|
||
|
|
{
|
||
|
|
id: ruleId,
|
||
|
|
options: getRuleOptions(config.rules[ruleId]),
|
||
|
|
report() {
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 });
|
||
|
|
}
|
||
|
|
const problem = reportTranslator.apply(null, arguments);
|
||
|
|
|
||
|
|
if (problem.fix && rule.meta && !rule.meta.fixable) {
|
||
|
|
throw new Error("Fixable rules should export a `meta.fixable` property.");
|
||
|
|
}
|
||
|
|
problems.push(problem);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is used to avoid breaking rules that used monkeypatch Linter, and relied on
|
||
|
|
* `linter.report` getting called with report info every time a rule reports a problem.
|
||
|
|
* To continue to support this, make sure that `context._linter.report` is called every
|
||
|
|
* time a problem is reported by a rule, even though `context._linter` is no longer a
|
||
|
|
* `Linter` instance.
|
||
|
|
*
|
||
|
|
* This should be removed in a major release after we create a better way to
|
||
|
|
* lint for unused disable comments.
|
||
|
|
* https://github.com/eslint/eslint/issues/9193
|
||
|
|
*/
|
||
|
|
sharedTraversalContext._linter.report( // eslint-disable-line no-underscore-dangle
|
||
|
|
problem.ruleId,
|
||
|
|
problem.severity,
|
||
|
|
{ loc: { start: { line: problem.line, column: problem.column - 1 } } },
|
||
|
|
problem.message
|
||
|
|
);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
)
|
||
|
|
);
|
||
|
|
|
||
|
|
try {
|
||
|
|
const ruleListeners = rule.create(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]
|
||
|
|
);
|
||
|
|
});
|
||
|
|
} catch (ex) {
|
||
|
|
ex.message = `Error while loading rule '${ruleId}': ${ex.message}`;
|
||
|
|
throw ex;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
// augment global scope with declared global variables
|
||
|
|
addDeclaredGlobals(scopeManager.scopes[0], config, this.environments);
|
||
|
|
|
||
|
|
const eventGenerator = new CodePathAnalyzer(new NodeEventGenerator(emitter));
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Each node has a type property. Whenever a particular type of
|
||
|
|
* node is found, an event is fired. This allows any listeners to
|
||
|
|
* automatically be informed that this type of node has been found
|
||
|
|
* and react accordingly.
|
||
|
|
*/
|
||
|
|
traverser.traverse(sourceCode.ast, {
|
||
|
|
enter(node, parent) {
|
||
|
|
node.parent = parent;
|
||
|
|
eventGenerator.enterNode(node);
|
||
|
|
},
|
||
|
|
leave(node) {
|
||
|
|
eventGenerator.leaveNode(node);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
return applyDisableDirectives({
|
||
|
|
directives: disableDirectives,
|
||
|
|
problems: problems.sort((problemA, problemB) => problemA.line - problemB.line || problemA.column - problemB.column),
|
||
|
|
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} [saveState] Indicates if the state from the last run should be saved.
|
||
|
|
* Mostly useful for testing purposes.
|
||
|
|
* @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 null 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) {
|
||
|
|
this.rules.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 this.rules.getAllLoadedRules();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Define a new parser module
|
||
|
|
* @param {any} parserId Name of the parser
|
||
|
|
* @param {any} parserModule The parser object
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
defineParser(parserId, parserModule) {
|
||
|
|
this._parsers.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;
|
||
|
|
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(text, config, options);
|
||
|
|
|
||
|
|
debug(`Generating fixed text for ${debugTextDescription} (pass ${passNumber})`);
|
||
|
|
fixedResult = SourceCodeFixer.applyFixes(text, 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
|
||
|
|
text = 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(text, config, options);
|
||
|
|
}
|
||
|
|
|
||
|
|
// ensure the last result properly reflects if fixes were done
|
||
|
|
fixedResult.fixed = fixed;
|
||
|
|
fixedResult.output = text;
|
||
|
|
|
||
|
|
return fixedResult;
|
||
|
|
}
|
||
|
|
};
|