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google_forms/node_modules/eslint/lib/linter/linter.js

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/**
* @fileoverview Main Linter Class
* @author Gyandeep Singh
* @author aladdin-add
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const
path = require("path"),
eslintScope = require("eslint-scope"),
evk = require("eslint-visitor-keys"),
espree = require("espree"),
merge = require("lodash.merge"),
pkg = require("../../package.json"),
astUtils = require("../shared/ast-utils"),
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{
directivesPattern
} = require("../shared/directives"),
{
Legacy: {
ConfigOps,
ConfigValidator,
environments: BuiltInEnvironments
}
} = require("@eslint/eslintrc/universal"),
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Traverser = require("../shared/traverser"),
{ SourceCode } = require("../source-code"),
CodePathAnalyzer = require("./code-path-analysis/code-path-analyzer"),
applyDisableDirectives = require("./apply-disable-directives"),
ConfigCommentParser = require("./config-comment-parser"),
NodeEventGenerator = require("./node-event-generator"),
createReportTranslator = require("./report-translator"),
Rules = require("./rules"),
createEmitter = require("./safe-emitter"),
SourceCodeFixer = require("./source-code-fixer"),
timing = require("./timing"),
ruleReplacements = require("../../conf/replacements.json");
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const { getRuleFromConfig } = require("../config/flat-config-helpers");
const { FlatConfigArray } = require("../config/flat-config-array");
const { RuleValidator } = require("../config/rule-validator");
const { assertIsRuleOptions, assertIsRuleSeverity } = require("../config/flat-config-schema");
const { normalizeSeverityToString } = require("../shared/severity");
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const debug = require("debug")("eslint:linter");
const MAX_AUTOFIX_PASSES = 10;
const DEFAULT_PARSER_NAME = "espree";
const DEFAULT_ECMA_VERSION = 5;
const commentParser = new ConfigCommentParser();
const DEFAULT_ERROR_LOC = { start: { line: 1, column: 0 }, end: { line: 1, column: 1 } };
const parserSymbol = Symbol.for("eslint.RuleTester.parser");
//------------------------------------------------------------------------------
// Typedefs
//------------------------------------------------------------------------------
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/** @typedef {InstanceType<import("../cli-engine/config-array").ConfigArray>} ConfigArray */
/** @typedef {InstanceType<import("../cli-engine/config-array").ExtractedConfig>} ExtractedConfig */
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/** @typedef {import("../shared/types").ConfigData} ConfigData */
/** @typedef {import("../shared/types").Environment} Environment */
/** @typedef {import("../shared/types").GlobalConf} GlobalConf */
/** @typedef {import("../shared/types").LintMessage} LintMessage */
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/** @typedef {import("../shared/types").SuppressedLintMessage} SuppressedLintMessage */
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/** @typedef {import("../shared/types").ParserOptions} ParserOptions */
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/** @typedef {import("../shared/types").LanguageOptions} LanguageOptions */
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/** @typedef {import("../shared/types").Processor} Processor */
/** @typedef {import("../shared/types").Rule} Rule */
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/* eslint-disable jsdoc/valid-types -- https://github.com/jsdoc-type-pratt-parser/jsdoc-type-pratt-parser/issues/4#issuecomment-778805577 */
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/**
* @template T
* @typedef {{ [P in keyof T]-?: T[P] }} Required
*/
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/* eslint-enable jsdoc/valid-types -- https://github.com/jsdoc-type-pratt-parser/jsdoc-type-pratt-parser/issues/4#issuecomment-778805577 */
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/**
* @typedef {Object} DisableDirective
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* @property {("disable"|"enable"|"disable-line"|"disable-next-line")} type Type of directive
* @property {number} line The line number
* @property {number} column The column number
* @property {(string|null)} ruleId The rule ID
* @property {string} justification The justification of directive
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*/
/**
* The private data for `Linter` instance.
* @typedef {Object} LinterInternalSlots
* @property {ConfigArray|null} lastConfigArray The `ConfigArray` instance that the last `verify()` call used.
* @property {SourceCode|null} lastSourceCode The `SourceCode` instance that the last `verify()` call used.
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* @property {SuppressedLintMessage[]} lastSuppressedMessages The `SuppressedLintMessage[]` instance that the last `verify()` call produced.
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* @property {Map<string, Parser>} parserMap The loaded parsers.
* @property {Rules} ruleMap The loaded rules.
*/
/**
* @typedef {Object} VerifyOptions
* @property {boolean} [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.
* @property {boolean} [disableFixes] if `true` then the linter doesn't make `fix`
* properties into the lint result.
* @property {string} [filename] the filename of the source code.
* @property {boolean | "off" | "warn" | "error"} [reportUnusedDisableDirectives] Adds reported errors for
* unused `eslint-disable` directives.
*/
/**
* @typedef {Object} ProcessorOptions
* @property {(filename:string, text:string) => boolean} [filterCodeBlock] the
* predicate function that selects adopt code blocks.
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* @property {Processor.postprocess} [postprocess] postprocessor for report
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* 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.
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* @property {Processor.preprocess} [preprocess] preprocessor for source text.
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* If provided, this should accept a string of source text, and return an
* array of code blocks to lint.
*/
/**
* @typedef {Object} FixOptions
* @property {boolean | ((message: LintMessage) => boolean)} [fix] Determines
* whether fixes should be applied.
*/
/**
* @typedef {Object} InternalOptions
* @property {string | null} warnInlineConfig The config name what `noInlineConfig` setting came from. If `noInlineConfig` setting didn't exist, this is null. If this is a config name, then the linter warns directive comments.
* @property {"off" | "warn" | "error"} reportUnusedDisableDirectives (boolean values were normalized)
*/
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
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/**
* Determines if a given object is Espree.
* @param {Object} parser The parser to check.
* @returns {boolean} True if the parser is Espree or false if not.
*/
function isEspree(parser) {
return !!(parser === espree || parser[parserSymbol] === espree);
}
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/**
* Ensures that variables representing built-in properties of the Global Object,
* and any globals declared by special block comments, are present in the global
* scope.
* @param {Scope} globalScope The global scope.
* @param {Object} configGlobals The globals declared in configuration
* @param {{exportedVariables: Object, enabledGlobals: Object}} commentDirectives Directives from comment configuration
* @returns {void}
*/
function addDeclaredGlobals(globalScope, configGlobals, { exportedVariables, enabledGlobals }) {
// Define configured global variables.
for (const id of new Set([...Object.keys(configGlobals), ...Object.keys(enabledGlobals)])) {
/*
* `ConfigOps.normalizeConfigGlobal` will throw an error if a configured global value is invalid. However, these errors would
* typically be caught when validating a config anyway (validity for inline global comments is checked separately).
*/
const configValue = configGlobals[id] === void 0 ? void 0 : ConfigOps.normalizeConfigGlobal(configGlobals[id]);
const commentValue = enabledGlobals[id] && enabledGlobals[id].value;
const value = commentValue || configValue;
const sourceComments = enabledGlobals[id] && enabledGlobals[id].comments;
if (value === "off") {
continue;
}
let variable = globalScope.set.get(id);
if (!variable) {
variable = new eslintScope.Variable(id, globalScope);
globalScope.variables.push(variable);
globalScope.set.set(id, variable);
}
variable.eslintImplicitGlobalSetting = configValue;
variable.eslintExplicitGlobal = sourceComments !== void 0;
variable.eslintExplicitGlobalComments = sourceComments;
variable.writeable = (value === "writable");
}
// mark all exported variables as such
Object.keys(exportedVariables).forEach(name => {
const variable = globalScope.set.get(name);
if (variable) {
variable.eslintUsed = true;
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variable.eslintExported = true;
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}
});
/*
* "through" contains all references which definitions cannot be found.
* Since we augment the global scope using configuration, we need to update
* references and remove the ones that were added by configuration.
*/
globalScope.through = globalScope.through.filter(reference => {
const name = reference.identifier.name;
const variable = globalScope.set.get(name);
if (variable) {
/*
* Links the variable and the reference.
* And this reference is removed from `Scope#through`.
*/
reference.resolved = variable;
variable.references.push(reference);
return false;
}
return true;
});
}
/**
* creates a missing-rule message.
* @param {string} ruleId the ruleId to create
* @returns {string} created error message
* @private
*/
function createMissingRuleMessage(ruleId) {
return Object.prototype.hasOwnProperty.call(ruleReplacements.rules, ruleId)
? `Rule '${ruleId}' was removed and replaced by: ${ruleReplacements.rules[ruleId].join(", ")}`
: `Definition for rule '${ruleId}' was not found.`;
}
/**
* creates a linting problem
* @param {Object} options to create linting error
* @param {string} [options.ruleId] the ruleId to report
* @param {Object} [options.loc] the loc to report
* @param {string} [options.message] the error message to report
* @param {string} [options.severity] the error message to report
* @returns {LintMessage} created problem, returns a missing-rule problem if only provided ruleId.
* @private
*/
function createLintingProblem(options) {
const {
ruleId = null,
loc = DEFAULT_ERROR_LOC,
message = createMissingRuleMessage(options.ruleId),
severity = 2
} = options;
return {
ruleId,
message,
line: loc.start.line,
column: loc.start.column + 1,
endLine: loc.end.line,
endColumn: loc.end.column + 1,
severity,
nodeType: null
};
}
/**
* Creates a collection of disable directives from a comment
* @param {Object} options to create disable directives
* @param {("disable"|"enable"|"disable-line"|"disable-next-line")} options.type The type of directive comment
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* @param {token} options.commentToken The Comment token
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* @param {string} options.value The value after the directive in the comment
* comment specified no specific rules, so it applies to all rules (e.g. `eslint-disable`)
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* @param {string} options.justification The justification of the directive
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* @param {function(string): {create: Function}} options.ruleMapper A map from rule IDs to defined rules
* @returns {Object} Directives and problems from the comment
*/
function createDisableDirectives(options) {
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const { commentToken, type, value, justification, ruleMapper } = options;
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const ruleIds = Object.keys(commentParser.parseListConfig(value));
const directiveRules = ruleIds.length ? ruleIds : [null];
const result = {
directives: [], // valid disable directives
directiveProblems: [] // problems in directives
};
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const parentComment = { commentToken, ruleIds };
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for (const ruleId of directiveRules) {
// push to directives, if the rule is defined(including null, e.g. /*eslint enable*/)
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if (ruleId === null || !!ruleMapper(ruleId)) {
if (type === "disable-next-line") {
result.directives.push({
parentComment,
type,
line: commentToken.loc.end.line,
column: commentToken.loc.end.column + 1,
ruleId,
justification
});
} else {
result.directives.push({
parentComment,
type,
line: commentToken.loc.start.line,
column: commentToken.loc.start.column + 1,
ruleId,
justification
});
}
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} else {
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result.directiveProblems.push(createLintingProblem({ ruleId, loc: commentToken.loc }));
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}
}
return result;
}
/**
* Parses comments in file to extract file-specific config of rules, globals
* and environments and merges them with global config; also code blocks
* where reporting is disabled or enabled and merges them with reporting config.
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* @param {SourceCode} sourceCode The SourceCode object to get comments from.
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* @param {function(string): {create: Function}} ruleMapper A map from rule IDs to defined rules
* @param {string|null} warnInlineConfig If a string then it should warn directive comments as disabled. The string value is the config name what the setting came from.
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* @returns {{configuredRules: Object, enabledGlobals: {value:string,comment:Token}[], exportedVariables: Object, problems: LintMessage[], 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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function getDirectiveComments(sourceCode, ruleMapper, warnInlineConfig) {
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const configuredRules = {};
const enabledGlobals = Object.create(null);
const exportedVariables = {};
const problems = [];
const disableDirectives = [];
const validator = new ConfigValidator({
builtInRules: Rules
});
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sourceCode.getInlineConfigNodes().filter(token => token.type !== "Shebang").forEach(comment => {
const { directivePart, justificationPart } = commentParser.extractDirectiveComment(comment.value);
const match = directivesPattern.exec(directivePart);
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if (!match) {
return;
}
const directiveText = match[1];
const lineCommentSupported = /^eslint-disable-(next-)?line$/u.test(directiveText);
if (comment.type === "Line" && !lineCommentSupported) {
return;
}
if (warnInlineConfig) {
const kind = comment.type === "Block" ? `/*${directiveText}*/` : `//${directiveText}`;
problems.push(createLintingProblem({
ruleId: null,
message: `'${kind}' has no effect because you have 'noInlineConfig' setting in ${warnInlineConfig}.`,
loc: comment.loc,
severity: 1
}));
return;
}
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if (directiveText === "eslint-disable-line" && comment.loc.start.line !== comment.loc.end.line) {
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const message = `${directiveText} comment should not span multiple lines.`;
problems.push(createLintingProblem({
ruleId: null,
message,
loc: comment.loc
}));
return;
}
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const directiveValue = directivePart.slice(match.index + directiveText.length);
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switch (directiveText) {
case "eslint-disable":
case "eslint-enable":
case "eslint-disable-next-line":
case "eslint-disable-line": {
const directiveType = directiveText.slice("eslint-".length);
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const options = { commentToken: comment, type: directiveType, value: directiveValue, justification: justificationPart, ruleMapper };
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const { directives, directiveProblems } = createDisableDirectives(options);
disableDirectives.push(...directives);
problems.push(...directiveProblems);
break;
}
case "exported":
Object.assign(exportedVariables, commentParser.parseStringConfig(directiveValue, comment));
break;
case "globals":
case "global":
for (const [id, { value }] of Object.entries(commentParser.parseStringConfig(directiveValue, comment))) {
let normalizedValue;
try {
normalizedValue = ConfigOps.normalizeConfigGlobal(value);
} catch (err) {
problems.push(createLintingProblem({
ruleId: null,
loc: comment.loc,
message: err.message
}));
continue;
}
if (enabledGlobals[id]) {
enabledGlobals[id].comments.push(comment);
enabledGlobals[id].value = normalizedValue;
} else {
enabledGlobals[id] = {
comments: [comment],
value: normalizedValue
};
}
}
break;
case "eslint": {
const parseResult = commentParser.parseJsonConfig(directiveValue, comment.loc);
if (parseResult.success) {
Object.keys(parseResult.config).forEach(name => {
const rule = ruleMapper(name);
const ruleValue = parseResult.config[name];
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if (!rule) {
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problems.push(createLintingProblem({ ruleId: name, loc: comment.loc }));
return;
}
try {
validator.validateRuleOptions(rule, name, ruleValue);
} catch (err) {
problems.push(createLintingProblem({
ruleId: name,
message: err.message,
loc: comment.loc
}));
// do not apply the config, if found invalid options.
return;
}
configuredRules[name] = ruleValue;
});
} else {
problems.push(parseResult.error);
}
break;
}
// no default
}
});
return {
configuredRules,
enabledGlobals,
exportedVariables,
problems,
disableDirectives
};
}
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/**
* Parses comments in file to extract disable directives.
* @param {SourceCode} sourceCode The SourceCode object to get comments from.
* @param {function(string): {create: Function}} ruleMapper A map from rule IDs to defined rules
* @returns {{problems: LintMessage[], disableDirectives: DisableDirective[]}}
* A collection of the directive comments that were found, along with any problems that occurred when parsing
*/
function getDirectiveCommentsForFlatConfig(sourceCode, ruleMapper) {
const problems = [];
const disableDirectives = [];
sourceCode.getInlineConfigNodes().filter(token => token.type !== "Shebang").forEach(comment => {
const { directivePart, justificationPart } = commentParser.extractDirectiveComment(comment.value);
const match = directivesPattern.exec(directivePart);
if (!match) {
return;
}
const directiveText = match[1];
const lineCommentSupported = /^eslint-disable-(next-)?line$/u.test(directiveText);
if (comment.type === "Line" && !lineCommentSupported) {
return;
}
if (directiveText === "eslint-disable-line" && comment.loc.start.line !== comment.loc.end.line) {
const message = `${directiveText} comment should not span multiple lines.`;
problems.push(createLintingProblem({
ruleId: null,
message,
loc: comment.loc
}));
return;
}
const directiveValue = directivePart.slice(match.index + directiveText.length);
switch (directiveText) {
case "eslint-disable":
case "eslint-enable":
case "eslint-disable-next-line":
case "eslint-disable-line": {
const directiveType = directiveText.slice("eslint-".length);
const options = { commentToken: comment, type: directiveType, value: directiveValue, justification: justificationPart, ruleMapper };
const { directives, directiveProblems } = createDisableDirectives(options);
disableDirectives.push(...directives);
problems.push(...directiveProblems);
break;
}
// no default
}
});
return {
problems,
disableDirectives
};
}
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/**
* Normalize ECMAScript version from the initial config
* @param {Parser} parser The parser which uses this options.
* @param {number} ecmaVersion ECMAScript version from the initial config
* @returns {number} normalized ECMAScript version
*/
function normalizeEcmaVersion(parser, ecmaVersion) {
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if (isEspree(parser)) {
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if (ecmaVersion === "latest") {
return espree.latestEcmaVersion;
}
}
/*
* Calculate ECMAScript edition number from official year version starting with
* ES2015, which corresponds with ES6 (or a difference of 2009).
*/
return ecmaVersion >= 2015 ? ecmaVersion - 2009 : ecmaVersion;
}
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/**
* Normalize ECMAScript version from the initial config into languageOptions (year)
* format.
* @param {any} [ecmaVersion] ECMAScript version from the initial config
* @returns {number} normalized ECMAScript version
*/
function normalizeEcmaVersionForLanguageOptions(ecmaVersion) {
switch (ecmaVersion) {
case 3:
return 3;
// void 0 = no ecmaVersion specified so use the default
case 5:
case void 0:
return 5;
default:
if (typeof ecmaVersion === "number") {
return ecmaVersion >= 2015 ? ecmaVersion : ecmaVersion + 2009;
}
}
/*
* We default to the latest supported ecmaVersion for everything else.
* Remember, this is for languageOptions.ecmaVersion, which sets the version
* that is used for a number of processes inside of ESLint. It's normally
* safe to assume people want the latest unless otherwise specified.
*/
return espree.latestEcmaVersion + 2009;
}
const eslintEnvPattern = /\/\*\s*eslint-env\s(.+?)(?:\*\/|$)/gsu;
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/**
* 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)) !== null) {
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if (match[0].endsWith("*/")) {
retv = Object.assign(
retv || {},
commentParser.parseListConfig(commentParser.extractDirectiveComment(match[1]).directivePart)
);
}
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}
return retv;
}
/**
* Convert "/path/to/<text>" to "<text>".
* `CLIEngine#executeOnText()` method gives "/path/to/<text>" if the filename
* was omitted because `configArray.extractConfig()` requires an absolute path.
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* But the linter should pass `<text>` to `RuleContext#filename` in that
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* case.
* Also, code blocks can have their virtual filename. If the parent filename was
* `<text>`, the virtual filename is `<text>/0_foo.js` or something like (i.e.,
* it's not an absolute path).
* @param {string} filename The filename to normalize.
* @returns {string} The normalized filename.
*/
function normalizeFilename(filename) {
const parts = filename.split(path.sep);
const index = parts.lastIndexOf("<text>");
return index === -1 ? filename : parts.slice(index).join(path.sep);
}
/**
* Normalizes the possible options for `linter.verify` and `linter.verifyAndFix` to a
* consistent shape.
* @param {VerifyOptions} providedOptions Options
* @param {ConfigData} config Config.
* @returns {Required<VerifyOptions> & InternalOptions} Normalized options
*/
function normalizeVerifyOptions(providedOptions, config) {
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const linterOptions = config.linterOptions || config;
// .noInlineConfig for eslintrc, .linterOptions.noInlineConfig for flat
const disableInlineConfig = linterOptions.noInlineConfig === true;
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const ignoreInlineConfig = providedOptions.allowInlineConfig === false;
const configNameOfNoInlineConfig = config.configNameOfNoInlineConfig
? ` (${config.configNameOfNoInlineConfig})`
: "";
let reportUnusedDisableDirectives = providedOptions.reportUnusedDisableDirectives;
if (typeof reportUnusedDisableDirectives === "boolean") {
reportUnusedDisableDirectives = reportUnusedDisableDirectives ? "error" : "off";
}
if (typeof reportUnusedDisableDirectives !== "string") {
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if (typeof linterOptions.reportUnusedDisableDirectives === "boolean") {
reportUnusedDisableDirectives = linterOptions.reportUnusedDisableDirectives ? "warn" : "off";
} else {
reportUnusedDisableDirectives = linterOptions.reportUnusedDisableDirectives === void 0 ? "off" : normalizeSeverityToString(linterOptions.reportUnusedDisableDirectives);
}
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}
return {
filename: normalizeFilename(providedOptions.filename || "<input>"),
allowInlineConfig: !ignoreInlineConfig,
warnInlineConfig: disableInlineConfig && !ignoreInlineConfig
? `your config${configNameOfNoInlineConfig}`
: null,
reportUnusedDisableDirectives,
disableFixes: Boolean(providedOptions.disableFixes)
};
}
/**
* Combines the provided parserOptions with the options from environments
* @param {Parser} parser The parser which uses this options.
* @param {ParserOptions} providedOptions The provided 'parserOptions' key in a config
* @param {Environment[]} enabledEnvironments The environments enabled in configuration and with inline comments
* @returns {ParserOptions} Resulting parser options after merge
*/
function resolveParserOptions(parser, providedOptions, enabledEnvironments) {
const parserOptionsFromEnv = enabledEnvironments
.filter(env => env.parserOptions)
.reduce((parserOptions, env) => merge(parserOptions, env.parserOptions), {});
const mergedParserOptions = merge(parserOptionsFromEnv, providedOptions || {});
const isModule = mergedParserOptions.sourceType === "module";
if (isModule) {
/*
* can't have global return inside of modules
* TODO: espree validate parserOptions.globalReturn when sourceType is setting to module.(@aladdin-add)
*/
mergedParserOptions.ecmaFeatures = Object.assign({}, mergedParserOptions.ecmaFeatures, { globalReturn: false });
}
mergedParserOptions.ecmaVersion = normalizeEcmaVersion(parser, mergedParserOptions.ecmaVersion);
return mergedParserOptions;
}
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/**
* Converts parserOptions to languageOptions for backwards compatibility with eslintrc.
* @param {ConfigData} config Config object.
* @param {Object} config.globals Global variable definitions.
* @param {Parser} config.parser The parser to use.
* @param {ParserOptions} config.parserOptions The parserOptions to use.
* @returns {LanguageOptions} The languageOptions equivalent.
*/
function createLanguageOptions({ globals: configuredGlobals, parser, parserOptions }) {
const {
ecmaVersion,
sourceType
} = parserOptions;
return {
globals: configuredGlobals,
ecmaVersion: normalizeEcmaVersionForLanguageOptions(ecmaVersion),
sourceType,
parser,
parserOptions
};
}
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/**
* Combines the provided globals object with the globals from environments
* @param {Record<string, GlobalConf>} providedGlobals The 'globals' key in a config
* @param {Environment[]} enabledEnvironments The environments enabled in configuration and with inline comments
* @returns {Record<string, GlobalConf>} The resolved globals object
*/
function resolveGlobals(providedGlobals, enabledEnvironments) {
return Object.assign(
{},
...enabledEnvironments.filter(env => env.globals).map(env => env.globals),
providedGlobals
);
}
/**
* 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 [];
}
/**
* Analyze scope of the given AST.
* @param {ASTNode} ast The `Program` node to analyze.
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* @param {LanguageOptions} languageOptions The parser options.
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* @param {Record<string, string[]>} visitorKeys The visitor keys.
* @returns {ScopeManager} The analysis result.
*/
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function analyzeScope(ast, languageOptions, visitorKeys) {
const parserOptions = languageOptions.parserOptions;
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const ecmaFeatures = parserOptions.ecmaFeatures || {};
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const ecmaVersion = languageOptions.ecmaVersion || DEFAULT_ECMA_VERSION;
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return eslintScope.analyze(ast, {
ignoreEval: true,
nodejsScope: ecmaFeatures.globalReturn,
impliedStrict: ecmaFeatures.impliedStrict,
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ecmaVersion: typeof ecmaVersion === "number" ? ecmaVersion : 6,
sourceType: languageOptions.sourceType || "script",
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childVisitorKeys: visitorKeys || evk.KEYS,
fallback: Traverser.getKeys
});
}
/**
* 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.
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* @param {LanguageOptions} languageOptions Options to pass to the parser
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* @param {string} filePath The path to the file being parsed.
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* @returns {{success: false, error: LintMessage}|{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
* @private
*/
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function parse(text, languageOptions, filePath) {
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const textToParse = stripUnicodeBOM(text).replace(astUtils.shebangPattern, (match, captured) => `//${captured}`);
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const { ecmaVersion, sourceType, parser } = languageOptions;
const parserOptions = Object.assign(
{ ecmaVersion, sourceType },
languageOptions.parserOptions,
{
loc: true,
range: true,
raw: true,
tokens: true,
comment: true,
eslintVisitorKeys: true,
eslintScopeManager: true,
filePath
}
);
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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 {
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debug("Parsing:", filePath);
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const parseResult = (typeof parser.parseForESLint === "function")
? parser.parseForESLint(textToParse, parserOptions)
: { ast: parser.parse(textToParse, parserOptions) };
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debug("Parsing successful:", filePath);
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const ast = parseResult.ast;
const parserServices = parseResult.services || {};
const visitorKeys = parseResult.visitorKeys || evk.KEYS;
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debug("Scope analysis:", filePath);
const scopeManager = parseResult.scopeManager || analyzeScope(ast, languageOptions, visitorKeys);
debug("Scope analysis successful:", filePath);
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return {
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.
* In that case, linter needs all the values that `parseForESLint()` returned.
*/
sourceCode: new SourceCode({
text,
ast,
parserServices,
scopeManager,
visitorKeys
})
};
} catch (ex) {
// If the message includes a leading line number, strip it:
const message = `Parsing error: ${ex.message.replace(/^line \d+:/iu, "").trim()}`;
debug("%s\n%s", message, ex.stack);
return {
success: false,
error: {
ruleId: null,
fatal: true,
severity: 2,
message,
line: ex.lineNumber,
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column: ex.column,
nodeType: null
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}
};
}
}
/**
* Runs a rule, and gets its listeners
* @param {Rule} rule A normalized rule with a `create` method
* @param {Context} ruleContext The context that should be passed to the rule
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* @throws {any} Any error during the rule's `create`
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* @returns {Object} A map of selector listeners provided by the rule
*/
function createRuleListeners(rule, ruleContext) {
try {
return rule.create(ruleContext);
} catch (ex) {
ex.message = `Error while loading rule '${ruleContext.id}': ${ex.message}`;
throw ex;
}
}
// 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"
};
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const BASE_TRAVERSAL_CONTEXT = Object.freeze(
Object.keys(DEPRECATED_SOURCECODE_PASSTHROUGHS).reduce(
(contextInfo, methodName) =>
Object.assign(contextInfo, {
[methodName](...args) {
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return this.sourceCode[DEPRECATED_SOURCECODE_PASSTHROUGHS[methodName]](...args);
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}
}),
{}
)
);
/**
* 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
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* @param {string | undefined} parserName The name of the parser in the config
* @param {LanguageOptions} languageOptions The options for parsing the code.
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* @param {Object} settings The settings that were enabled in the config
* @param {string} filename The reported filename of the code
* @param {boolean} disableFixes If true, it doesn't make `fix` properties.
* @param {string | undefined} cwd cwd of the cli
* @param {string} physicalFilename The full path of the file on disk without any code block information
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* @returns {LintMessage[]} An array of reported problems
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*/
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function runRules(sourceCode, configuredRules, ruleMapper, parserName, languageOptions, settings, filename, disableFixes, cwd, physicalFilename) {
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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),
{
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getAncestors: () => sourceCode.getAncestors(currentNode),
getDeclaredVariables: node => sourceCode.getDeclaredVariables(node),
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getCwd: () => cwd,
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cwd,
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getFilename: () => filename,
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filename,
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getPhysicalFilename: () => physicalFilename || filename,
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physicalFilename: physicalFilename || filename,
getScope: () => sourceCode.getScope(currentNode),
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getSourceCode: () => sourceCode,
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sourceCode,
markVariableAsUsed: name => sourceCode.markVariableAsUsed(name, currentNode),
parserOptions: {
...languageOptions.parserOptions
},
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parserPath: parserName,
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languageOptions,
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parserServices: sourceCode.parserServices,
settings
}
)
);
const lintingProblems = [];
Object.keys(configuredRules).forEach(ruleId => {
const severity = ConfigOps.getRuleSeverity(configuredRules[ruleId]);
// not load disabled rules
if (severity === 0) {
return;
}
const rule = ruleMapper(ruleId);
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if (!rule) {
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lintingProblems.push(createLintingProblem({ ruleId }));
return;
}
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,
disableFixes
});
}
const problem = reportTranslator(...args);
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if (problem.fix && !(rule.meta && rule.meta.fixable)) {
throw new Error("Fixable rules must set the `meta.fixable` property to \"code\" or \"whitespace\".");
}
if (problem.suggestions && !(rule.meta && rule.meta.hasSuggestions === true)) {
if (rule.meta && rule.meta.docs && typeof rule.meta.docs.suggestion !== "undefined") {
// Encourage migration from the former property name.
throw new Error("Rules with suggestions must set the `meta.hasSuggestions` property to `true`. `meta.docs.suggestion` is ignored by ESLint.");
}
throw new Error("Rules with suggestions must set the `meta.hasSuggestions` property to `true`.");
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}
lintingProblems.push(problem);
}
}
)
);
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const ruleListeners = timing.enabled ? timing.time(ruleId, createRuleListeners)(rule, ruleContext) : createRuleListeners(rule, ruleContext);
/**
* Include `ruleId` in error logs
* @param {Function} ruleListener A rule method that listens for a node.
* @returns {Function} ruleListener wrapped in error handler
*/
function addRuleErrorHandler(ruleListener) {
return function ruleErrorHandler(...listenerArgs) {
try {
return ruleListener(...listenerArgs);
} catch (e) {
e.ruleId = ruleId;
throw e;
}
};
}
if (typeof ruleListeners === "undefined" || ruleListeners === null) {
throw new Error(`The create() function for rule '${ruleId}' did not return an object.`);
}
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// add all the selectors from the rule as listeners
Object.keys(ruleListeners).forEach(selector => {
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const ruleListener = timing.enabled
? timing.time(ruleId, ruleListeners[selector])
: ruleListeners[selector];
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emitter.on(
selector,
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addRuleErrorHandler(ruleListener)
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);
});
});
// only run code path analyzer if the top level node is "Program", skip otherwise
const eventGenerator = nodeQueue[0].node.type === "Program"
? new CodePathAnalyzer(new NodeEventGenerator(emitter, { visitorKeys: sourceCode.visitorKeys, fallback: Traverser.getKeys }))
: new NodeEventGenerator(emitter, { visitorKeys: sourceCode.visitorKeys, fallback: Traverser.getKeys });
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;
}
/**
* Ensure the source code to be a string.
* @param {string|SourceCode} textOrSourceCode The text or source code object.
* @returns {string} The source code text.
*/
function ensureText(textOrSourceCode) {
if (typeof textOrSourceCode === "object") {
const { hasBOM, text } = textOrSourceCode;
const bom = hasBOM ? "\uFEFF" : "";
return bom + text;
}
return String(textOrSourceCode);
}
/**
* Get an environment.
* @param {LinterInternalSlots} slots The internal slots of Linter.
* @param {string} envId The environment ID to get.
* @returns {Environment|null} The environment.
*/
function getEnv(slots, envId) {
return (
(slots.lastConfigArray && slots.lastConfigArray.pluginEnvironments.get(envId)) ||
BuiltInEnvironments.get(envId) ||
null
);
}
/**
* Get a rule.
* @param {LinterInternalSlots} slots The internal slots of Linter.
* @param {string} ruleId The rule ID to get.
* @returns {Rule|null} The rule.
*/
function getRule(slots, ruleId) {
return (
(slots.lastConfigArray && slots.lastConfigArray.pluginRules.get(ruleId)) ||
slots.ruleMap.get(ruleId)
);
}
/**
* Normalize the value of the cwd
* @param {string | undefined} cwd raw value of the cwd, path to a directory that should be considered as the current working directory, can be undefined.
* @returns {string | undefined} normalized cwd
*/
function normalizeCwd(cwd) {
if (cwd) {
return cwd;
}
if (typeof process === "object") {
return process.cwd();
}
// It's more explicit to assign the undefined
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// eslint-disable-next-line no-undefined -- Consistently returning a value
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return undefined;
}
/**
* The map to store private data.
* @type {WeakMap<Linter, LinterInternalSlots>}
*/
const internalSlotsMap = new WeakMap();
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/**
* Throws an error when the given linter is in flat config mode.
* @param {Linter} linter The linter to check.
* @returns {void}
* @throws {Error} If the linter is in flat config mode.
*/
function assertEslintrcConfig(linter) {
const { configType } = internalSlotsMap.get(linter);
if (configType === "flat") {
throw new Error("This method cannot be used with flat config. Add your entries directly into the config array.");
}
}
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//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------
/**
* Object that is responsible for verifying JavaScript text
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* @name Linter
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*/
class Linter {
/**
* Initialize the Linter.
* @param {Object} [config] the config object
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* @param {string} [config.cwd] path to a directory that should be considered as the current working directory, can be undefined.
* @param {"flat"|"eslintrc"} [config.configType="eslintrc"] the type of config used.
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*/
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constructor({ cwd, configType } = {}) {
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internalSlotsMap.set(this, {
cwd: normalizeCwd(cwd),
lastConfigArray: null,
lastSourceCode: null,
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lastSuppressedMessages: [],
configType, // TODO: Remove after flat config conversion
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parserMap: new Map([["espree", espree]]),
ruleMap: new Rules()
});
this.version = pkg.version;
}
/**
* Getter for package version.
* @static
* @returns {string} The version from package.json.
*/
static get version() {
return pkg.version;
}
/**
* Same as linter.verify, except without support for processors.
* @param {string|SourceCode} textOrSourceCode The text to parse or a SourceCode object.
* @param {ConfigData} providedConfig An ESLintConfig instance to configure everything.
* @param {VerifyOptions} [providedOptions] The optional filename of the file being checked.
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* @throws {Error} If during rule execution.
* @returns {(LintMessage|SuppressedLintMessage)[]} The results as an array of messages or an empty array if no messages.
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*/
_verifyWithoutProcessors(textOrSourceCode, providedConfig, providedOptions) {
const slots = internalSlotsMap.get(this);
const config = providedConfig || {};
const options = normalizeVerifyOptions(providedOptions, config);
let text;
// evaluate arguments
if (typeof textOrSourceCode === "string") {
slots.lastSourceCode = null;
text = textOrSourceCode;
} else {
slots.lastSourceCode = textOrSourceCode;
text = textOrSourceCode.text;
}
// Resolve parser.
let parserName = DEFAULT_PARSER_NAME;
let parser = espree;
if (typeof config.parser === "object" && config.parser !== null) {
parserName = config.parser.filePath;
parser = config.parser.definition;
} else if (typeof config.parser === "string") {
if (!slots.parserMap.has(config.parser)) {
return [{
ruleId: null,
fatal: true,
severity: 2,
message: `Configured parser '${config.parser}' was not found.`,
line: 0,
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column: 0,
nodeType: null
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}];
}
parserName = config.parser;
parser = slots.parserMap.get(config.parser);
}
// search and apply "eslint-env *".
const envInFile = options.allowInlineConfig && !options.warnInlineConfig
? findEslintEnv(text)
: {};
const resolvedEnvConfig = Object.assign({ builtin: true }, config.env, envInFile);
const enabledEnvs = Object.keys(resolvedEnvConfig)
.filter(envName => resolvedEnvConfig[envName])
.map(envName => getEnv(slots, envName))
.filter(env => env);
const parserOptions = resolveParserOptions(parser, config.parserOptions || {}, enabledEnvs);
const configuredGlobals = resolveGlobals(config.globals || {}, enabledEnvs);
const settings = config.settings || {};
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const languageOptions = createLanguageOptions({
globals: config.globals,
parser,
parserOptions
});
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if (!slots.lastSourceCode) {
const parseResult = parse(
text,
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languageOptions,
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options.filename
);
if (!parseResult.success) {
return [parseResult.error];
}
slots.lastSourceCode = 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).
*/
if (!slots.lastSourceCode.scopeManager) {
slots.lastSourceCode = new SourceCode({
text: slots.lastSourceCode.text,
ast: slots.lastSourceCode.ast,
parserServices: slots.lastSourceCode.parserServices,
visitorKeys: slots.lastSourceCode.visitorKeys,
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scopeManager: analyzeScope(slots.lastSourceCode.ast, languageOptions)
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});
}
}
const sourceCode = slots.lastSourceCode;
const commentDirectives = options.allowInlineConfig
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? getDirectiveComments(sourceCode, ruleId => getRule(slots, ruleId), options.warnInlineConfig)
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: { 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 => getRule(slots, ruleId),
parserName,
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languageOptions,
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settings,
options.filename,
options.disableFixes,
slots.cwd,
providedOptions.physicalFilename
);
} 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);
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if (err.ruleId) {
err.message += `\nRule: "${err.ruleId}"`;
}
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throw err;
}
return applyDisableDirectives({
directives: commentDirectives.disableDirectives,
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disableFixes: options.disableFixes,
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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 {ConfigData|ConfigArray} config An ESLintConfig instance to configure everything.
* @param {(string|(VerifyOptions&ProcessorOptions))} [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", "allowInlineConfig", and some properties.
* @returns {LintMessage[]} The results as an array of messages or an empty array if no messages.
*/
verify(textOrSourceCode, config, filenameOrOptions) {
debug("Verify");
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const { configType, cwd } = internalSlotsMap.get(this);
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const options = typeof filenameOrOptions === "string"
? { filename: filenameOrOptions }
: filenameOrOptions || {};
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if (config) {
if (configType === "flat") {
/*
* Because of how Webpack packages up the files, we can't
* compare directly to `FlatConfigArray` using `instanceof`
* because it's not the same `FlatConfigArray` as in the tests.
* So, we work around it by assuming an array is, in fact, a
* `FlatConfigArray` if it has a `getConfig()` method.
*/
let configArray = config;
if (!Array.isArray(config) || typeof config.getConfig !== "function") {
configArray = new FlatConfigArray(config, { basePath: cwd });
configArray.normalizeSync();
}
return this._distinguishSuppressedMessages(this._verifyWithFlatConfigArray(textOrSourceCode, configArray, options, true));
}
if (typeof config.extractConfig === "function") {
return this._distinguishSuppressedMessages(this._verifyWithConfigArray(textOrSourceCode, config, options));
}
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}
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/*
* If we get to here, it means `config` is just an object rather
* than a config array so we can go right into linting.
*/
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/*
* `Linter` doesn't support `overrides` property in configuration.
* So we cannot apply multiple processors.
*/
if (options.preprocess || options.postprocess) {
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return this._distinguishSuppressedMessages(this._verifyWithProcessor(textOrSourceCode, config, options));
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}
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return this._distinguishSuppressedMessages(this._verifyWithoutProcessors(textOrSourceCode, config, options));
}
/**
* Verify with a processor.
* @param {string|SourceCode} textOrSourceCode The source code.
* @param {FlatConfig} config The config array.
* @param {VerifyOptions&ProcessorOptions} options The options.
* @param {FlatConfigArray} [configForRecursive] The `ConfigArray` object to apply multiple processors recursively.
* @returns {(LintMessage|SuppressedLintMessage)[]} The found problems.
*/
_verifyWithFlatConfigArrayAndProcessor(textOrSourceCode, config, options, configForRecursive) {
const filename = options.filename || "<input>";
const filenameToExpose = normalizeFilename(filename);
const physicalFilename = options.physicalFilename || filenameToExpose;
const text = ensureText(textOrSourceCode);
const preprocess = options.preprocess || (rawText => [rawText]);
const postprocess = options.postprocess || (messagesList => messagesList.flat());
const filterCodeBlock =
options.filterCodeBlock ||
(blockFilename => blockFilename.endsWith(".js"));
const originalExtname = path.extname(filename);
let blocks;
try {
blocks = preprocess(text, filenameToExpose);
} catch (ex) {
// If the message includes a leading line number, strip it:
const message = `Preprocessing error: ${ex.message.replace(/^line \d+:/iu, "").trim()}`;
debug("%s\n%s", message, ex.stack);
return [
{
ruleId: null,
fatal: true,
severity: 2,
message,
line: ex.lineNumber,
column: ex.column,
nodeType: null
}
];
}
const messageLists = blocks.map((block, i) => {
debug("A code block was found: %o", block.filename || "(unnamed)");
// Keep the legacy behavior.
if (typeof block === "string") {
return this._verifyWithFlatConfigArrayAndWithoutProcessors(block, config, options);
}
const blockText = block.text;
const blockName = path.join(filename, `${i}_${block.filename}`);
// Skip this block if filtered.
if (!filterCodeBlock(blockName, blockText)) {
debug("This code block was skipped.");
return [];
}
// Resolve configuration again if the file content or extension was changed.
if (configForRecursive && (text !== blockText || path.extname(blockName) !== originalExtname)) {
debug("Resolving configuration again because the file content or extension was changed.");
return this._verifyWithFlatConfigArray(
blockText,
configForRecursive,
{ ...options, filename: blockName, physicalFilename }
);
}
// Does lint.
return this._verifyWithFlatConfigArrayAndWithoutProcessors(
blockText,
config,
{ ...options, filename: blockName, physicalFilename }
);
});
return postprocess(messageLists, filenameToExpose);
}
/**
* Same as linter.verify, except without support for processors.
* @param {string|SourceCode} textOrSourceCode The text to parse or a SourceCode object.
* @param {FlatConfig} providedConfig An ESLintConfig instance to configure everything.
* @param {VerifyOptions} [providedOptions] The optional filename of the file being checked.
* @throws {Error} If during rule execution.
* @returns {(LintMessage|SuppressedLintMessage)[]} The results as an array of messages or an empty array if no messages.
*/
_verifyWithFlatConfigArrayAndWithoutProcessors(textOrSourceCode, providedConfig, providedOptions) {
const slots = internalSlotsMap.get(this);
const config = providedConfig || {};
const options = normalizeVerifyOptions(providedOptions, config);
let text;
// evaluate arguments
if (typeof textOrSourceCode === "string") {
slots.lastSourceCode = null;
text = textOrSourceCode;
} else {
slots.lastSourceCode = textOrSourceCode;
text = textOrSourceCode.text;
}
const languageOptions = config.languageOptions;
languageOptions.ecmaVersion = normalizeEcmaVersionForLanguageOptions(
languageOptions.ecmaVersion
);
// double check that there is a parser to avoid mysterious error messages
if (!languageOptions.parser) {
throw new TypeError(`No parser specified for ${options.filename}`);
}
// Espree expects this information to be passed in
if (isEspree(languageOptions.parser)) {
const parserOptions = languageOptions.parserOptions;
if (languageOptions.sourceType) {
parserOptions.sourceType = languageOptions.sourceType;
if (
parserOptions.sourceType === "module" &&
parserOptions.ecmaFeatures &&
parserOptions.ecmaFeatures.globalReturn
) {
parserOptions.ecmaFeatures.globalReturn = false;
}
}
}
const settings = config.settings || {};
if (!slots.lastSourceCode) {
const parseResult = parse(
text,
languageOptions,
options.filename
);
if (!parseResult.success) {
return [parseResult.error];
}
slots.lastSourceCode = 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).
*/
if (!slots.lastSourceCode.scopeManager) {
slots.lastSourceCode = new SourceCode({
text: slots.lastSourceCode.text,
ast: slots.lastSourceCode.ast,
parserServices: slots.lastSourceCode.parserServices,
visitorKeys: slots.lastSourceCode.visitorKeys,
scopeManager: analyzeScope(slots.lastSourceCode.ast, languageOptions)
});
}
}
const sourceCode = slots.lastSourceCode;
/*
* Make adjustments based on the language options. For JavaScript,
* this is primarily about adding variables into the global scope
* to account for ecmaVersion and configured globals.
*/
sourceCode.applyLanguageOptions(languageOptions);
const mergedInlineConfig = {
rules: {}
};
const inlineConfigProblems = [];
/*
* Inline config can be either enabled or disabled. If disabled, it's possible
* to detect the inline config and emit a warning (though this is not required).
* So we first check to see if inline config is allowed at all, and if so, we
* need to check if it's a warning or not.
*/
if (options.allowInlineConfig) {
// if inline config should warn then add the warnings
if (options.warnInlineConfig) {
sourceCode.getInlineConfigNodes().forEach(node => {
inlineConfigProblems.push(createLintingProblem({
ruleId: null,
message: `'${sourceCode.text.slice(node.range[0], node.range[1])}' has no effect because you have 'noInlineConfig' setting in ${options.warnInlineConfig}.`,
loc: node.loc,
severity: 1
}));
});
} else {
const inlineConfigResult = sourceCode.applyInlineConfig();
inlineConfigProblems.push(
...inlineConfigResult.problems
.map(createLintingProblem)
.map(problem => {
problem.fatal = true;
return problem;
})
);
// next we need to verify information about the specified rules
const ruleValidator = new RuleValidator();
for (const { config: inlineConfig, node } of inlineConfigResult.configs) {
Object.keys(inlineConfig.rules).forEach(ruleId => {
const rule = getRuleFromConfig(ruleId, config);
const ruleValue = inlineConfig.rules[ruleId];
if (!rule) {
inlineConfigProblems.push(createLintingProblem({ ruleId, loc: node.loc }));
return;
}
try {
const ruleOptions = Array.isArray(ruleValue) ? ruleValue : [ruleValue];
assertIsRuleOptions(ruleId, ruleValue);
assertIsRuleSeverity(ruleId, ruleOptions[0]);
ruleValidator.validate({
plugins: config.plugins,
rules: {
[ruleId]: ruleOptions
}
});
mergedInlineConfig.rules[ruleId] = ruleValue;
} catch (err) {
let baseMessage = err.message.slice(
err.message.startsWith("Key \"rules\":")
? err.message.indexOf(":", 12) + 1
: err.message.indexOf(":") + 1
).trim();
if (err.messageTemplate) {
baseMessage += ` You passed "${ruleValue}".`;
}
inlineConfigProblems.push(createLintingProblem({
ruleId,
message: `Inline configuration for rule "${ruleId}" is invalid:\n\t${baseMessage}\n`,
loc: node.loc
}));
}
});
}
}
}
const commentDirectives = options.allowInlineConfig && !options.warnInlineConfig
? getDirectiveCommentsForFlatConfig(
sourceCode,
ruleId => getRuleFromConfig(ruleId, config)
)
: { problems: [], disableDirectives: [] };
const configuredRules = Object.assign({}, config.rules, mergedInlineConfig.rules);
let lintingProblems;
sourceCode.finalize();
try {
lintingProblems = runRules(
sourceCode,
configuredRules,
ruleId => getRuleFromConfig(ruleId, config),
void 0,
languageOptions,
settings,
options.filename,
options.disableFixes,
slots.cwd,
providedOptions.physicalFilename
);
} 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:", languageOptions.parserOptions);
// debug("Parser Path:", parserName);
debug("Settings:", settings);
if (err.ruleId) {
err.message += `\nRule: "${err.ruleId}"`;
}
throw err;
}
return applyDisableDirectives({
directives: commentDirectives.disableDirectives,
disableFixes: options.disableFixes,
problems: lintingProblems
.concat(commentDirectives.problems)
.concat(inlineConfigProblems)
.sort((problemA, problemB) => problemA.line - problemB.line || problemA.column - problemB.column),
reportUnusedDisableDirectives: options.reportUnusedDisableDirectives
});
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}
/**
* Verify a given code with `ConfigArray`.
* @param {string|SourceCode} textOrSourceCode The source code.
* @param {ConfigArray} configArray The config array.
* @param {VerifyOptions&ProcessorOptions} options The options.
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* @returns {(LintMessage|SuppressedLintMessage)[]} The found problems.
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*/
_verifyWithConfigArray(textOrSourceCode, configArray, options) {
debug("With ConfigArray: %s", options.filename);
// Store the config array in order to get plugin envs and rules later.
internalSlotsMap.get(this).lastConfigArray = configArray;
// Extract the final config for this file.
const config = configArray.extractConfig(options.filename);
const processor =
config.processor &&
configArray.pluginProcessors.get(config.processor);
// Verify.
if (processor) {
debug("Apply the processor: %o", config.processor);
const { preprocess, postprocess, supportsAutofix } = processor;
const disableFixes = options.disableFixes || !supportsAutofix;
return this._verifyWithProcessor(
textOrSourceCode,
config,
{ ...options, disableFixes, postprocess, preprocess },
configArray
);
}
return this._verifyWithoutProcessors(textOrSourceCode, config, options);
}
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/**
* Verify a given code with a flat config.
* @param {string|SourceCode} textOrSourceCode The source code.
* @param {FlatConfigArray} configArray The config array.
* @param {VerifyOptions&ProcessorOptions} options The options.
* @param {boolean} [firstCall=false] Indicates if this is being called directly
* from verify(). (TODO: Remove once eslintrc is removed.)
* @returns {(LintMessage|SuppressedLintMessage)[]} The found problems.
*/
_verifyWithFlatConfigArray(textOrSourceCode, configArray, options, firstCall = false) {
debug("With flat config: %s", options.filename);
// we need a filename to match configs against
const filename = options.filename || "__placeholder__.js";
// Store the config array in order to get plugin envs and rules later.
internalSlotsMap.get(this).lastConfigArray = configArray;
const config = configArray.getConfig(filename);
if (!config) {
return [
{
ruleId: null,
severity: 1,
message: `No matching configuration found for ${filename}.`,
line: 0,
column: 0,
nodeType: null
}
];
}
// Verify.
if (config.processor) {
debug("Apply the processor: %o", config.processor);
const { preprocess, postprocess, supportsAutofix } = config.processor;
const disableFixes = options.disableFixes || !supportsAutofix;
return this._verifyWithFlatConfigArrayAndProcessor(
textOrSourceCode,
config,
{ ...options, filename, disableFixes, postprocess, preprocess },
configArray
);
}
// check for options-based processing
if (firstCall && (options.preprocess || options.postprocess)) {
return this._verifyWithFlatConfigArrayAndProcessor(textOrSourceCode, config, options);
}
return this._verifyWithFlatConfigArrayAndWithoutProcessors(textOrSourceCode, config, options);
}
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/**
* Verify with a processor.
* @param {string|SourceCode} textOrSourceCode The source code.
* @param {ConfigData|ExtractedConfig} config The config array.
* @param {VerifyOptions&ProcessorOptions} options The options.
* @param {ConfigArray} [configForRecursive] The `ConfigArray` object to apply multiple processors recursively.
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* @returns {(LintMessage|SuppressedLintMessage)[]} The found problems.
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*/
_verifyWithProcessor(textOrSourceCode, config, options, configForRecursive) {
const filename = options.filename || "<input>";
const filenameToExpose = normalizeFilename(filename);
const physicalFilename = options.physicalFilename || filenameToExpose;
const text = ensureText(textOrSourceCode);
const preprocess = options.preprocess || (rawText => [rawText]);
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const postprocess = options.postprocess || (messagesList => messagesList.flat());
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const filterCodeBlock =
options.filterCodeBlock ||
(blockFilename => blockFilename.endsWith(".js"));
const originalExtname = path.extname(filename);
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let blocks;
try {
blocks = preprocess(text, filenameToExpose);
} catch (ex) {
// If the message includes a leading line number, strip it:
const message = `Preprocessing error: ${ex.message.replace(/^line \d+:/iu, "").trim()}`;
debug("%s\n%s", message, ex.stack);
return [
{
ruleId: null,
fatal: true,
severity: 2,
message,
line: ex.lineNumber,
column: ex.column,
nodeType: null
}
];
}
const messageLists = blocks.map((block, i) => {
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debug("A code block was found: %o", block.filename || "(unnamed)");
// Keep the legacy behavior.
if (typeof block === "string") {
return this._verifyWithoutProcessors(block, config, options);
}
const blockText = block.text;
const blockName = path.join(filename, `${i}_${block.filename}`);
// Skip this block if filtered.
if (!filterCodeBlock(blockName, blockText)) {
debug("This code block was skipped.");
return [];
}
// Resolve configuration again if the file content or extension was changed.
if (configForRecursive && (text !== blockText || path.extname(blockName) !== originalExtname)) {
debug("Resolving configuration again because the file content or extension was changed.");
return this._verifyWithConfigArray(
blockText,
configForRecursive,
{ ...options, filename: blockName, physicalFilename }
);
}
// Does lint.
return this._verifyWithoutProcessors(
blockText,
config,
{ ...options, filename: blockName, physicalFilename }
);
});
return postprocess(messageLists, filenameToExpose);
}
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/**
* Given a list of reported problems, distinguish problems between normal messages and suppressed messages.
* The normal messages will be returned and the suppressed messages will be stored as lastSuppressedMessages.
* @param {Array<LintMessage|SuppressedLintMessage>} problems A list of reported problems.
* @returns {LintMessage[]} A list of LintMessage.
*/
_distinguishSuppressedMessages(problems) {
const messages = [];
const suppressedMessages = [];
const slots = internalSlotsMap.get(this);
for (const problem of problems) {
if (problem.suppressions) {
suppressedMessages.push(problem);
} else {
messages.push(problem);
}
}
slots.lastSuppressedMessages = suppressedMessages;
return messages;
}
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/**
* Gets the SourceCode object representing the parsed source.
* @returns {SourceCode} The SourceCode object.
*/
getSourceCode() {
return internalSlotsMap.get(this).lastSourceCode;
}
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/**
* Gets the list of SuppressedLintMessage produced in the last running.
* @returns {SuppressedLintMessage[]} The list of SuppressedLintMessage
*/
getSuppressedMessages() {
return internalSlotsMap.get(this).lastSuppressedMessages;
}
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/**
* Defines a new linting rule.
* @param {string} ruleId A unique rule identifier
* @param {Function | Rule} ruleModule Function from context to object mapping AST node types to event handlers
* @returns {void}
*/
defineRule(ruleId, ruleModule) {
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assertEslintrcConfig(this);
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internalSlotsMap.get(this).ruleMap.define(ruleId, ruleModule);
}
/**
* Defines many new linting rules.
* @param {Record<string, Function | Rule>} rulesToDefine map from unique rule identifier to rule
* @returns {void}
*/
defineRules(rulesToDefine) {
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assertEslintrcConfig(this);
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Object.getOwnPropertyNames(rulesToDefine).forEach(ruleId => {
this.defineRule(ruleId, rulesToDefine[ruleId]);
});
}
/**
* Gets an object with all loaded rules.
* @returns {Map<string, Rule>} All loaded rules
*/
getRules() {
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assertEslintrcConfig(this);
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const { lastConfigArray, ruleMap } = internalSlotsMap.get(this);
return new Map(function *() {
yield* ruleMap;
if (lastConfigArray) {
yield* lastConfigArray.pluginRules;
}
}());
}
/**
* Define a new parser module
* @param {string} parserId Name of the parser
* @param {Parser} parserModule The parser object
* @returns {void}
*/
defineParser(parserId, parserModule) {
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assertEslintrcConfig(this);
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internalSlotsMap.get(this).parserMap.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.
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* @param {ConfigData|ConfigArray|FlatConfigArray} config The ESLint config object to use.
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* @param {VerifyOptions&ProcessorOptions&FixOptions} options The ESLint options object to use.
* @returns {{fixed:boolean,messages:LintMessage[],output:string}} 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;
}
}
module.exports = {
Linter,
/**
* Get the internal slots of a given Linter instance for tests.
* @param {Linter} instance The Linter instance to get.
* @returns {LinterInternalSlots} The internal slots.
*/
getLinterInternalSlots(instance) {
return internalSlotsMap.get(instance);
}
};