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1210 lines
40 KiB
1210 lines
40 KiB
/**
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* @fileoverview Main ESLint object.
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* @author Nicholas C. Zakas
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const assert = require("assert"),
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EventEmitter = require("events").EventEmitter,
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escope = require("escope"),
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levn = require("levn"),
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blankScriptAST = require("../conf/blank-script.json"),
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DEFAULT_PARSER = require("../conf/eslint.json").parser,
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replacements = require("../conf/replacements.json"),
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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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CommentEventGenerator = require("./util/comment-event-generator"),
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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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RuleContext = require("./rule-context"),
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rules = require("./rules"),
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timing = require("./timing");
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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(function(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.substring(pos + 1, name.length);
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name = name.substring(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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* @param {Object[]} messages The messages queue for potential error message.
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* @returns {Object} Result map object
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*/
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function parseJsonConfig(string, location, messages) {
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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 items;
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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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// 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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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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messages.push({
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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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return items;
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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(function(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 {ASTNode} program The top node of the AST.
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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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* @returns {void}
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*/
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function addDeclaredGlobals(program, globalScope, config) {
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const declaredGlobals = {},
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exportedGlobals = {},
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explicitGlobals = {},
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builtin = Environments.get("builtin");
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Object.assign(declaredGlobals, builtin);
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Object.keys(config.env).forEach(function(name) {
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if (config.env[name]) {
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const env = Environments.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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});
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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(function(name) {
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let variable = globalScope.set.get(name);
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if (!variable) {
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variable = new escope.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(function(name) {
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let variable = globalScope.set.get(name);
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if (!variable) {
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variable = new escope.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(function(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(function(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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* Add data to reporting configuration to disable reporting for list of rules
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* starting from start location
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* @param {Object[]} reportingConfig Current reporting configuration
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* @param {Object} start Position to start
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* @param {string[]} rulesToDisable List of rules
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* @returns {void}
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*/
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function disableReporting(reportingConfig, start, rulesToDisable) {
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if (rulesToDisable.length) {
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rulesToDisable.forEach(function(rule) {
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reportingConfig.push({
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start,
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end: null,
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rule
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});
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});
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} else {
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reportingConfig.push({
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start,
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end: null,
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rule: null
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});
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}
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}
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/**
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* Add data to reporting configuration to enable reporting for list of rules
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* starting from start location
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* @param {Object[]} reportingConfig Current reporting configuration
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* @param {Object} start Position to start
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* @param {string[]} rulesToEnable List of rules
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* @returns {void}
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*/
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function enableReporting(reportingConfig, start, rulesToEnable) {
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let i;
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if (rulesToEnable.length) {
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rulesToEnable.forEach(function(rule) {
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for (i = reportingConfig.length - 1; i >= 0; i--) {
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if (!reportingConfig[i].end && reportingConfig[i].rule === rule) {
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reportingConfig[i].end = start;
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break;
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}
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}
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});
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} else {
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// find all previous disabled locations if they was started as list of rules
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let prevStart;
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for (i = reportingConfig.length - 1; i >= 0; i--) {
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if (prevStart && prevStart !== reportingConfig[i].start) {
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break;
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}
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if (!reportingConfig[i].end) {
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reportingConfig[i].end = start;
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prevStart = reportingConfig[i].start;
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}
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}
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}
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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 {Object[]} reportingConfig The existing reporting configuration data.
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* @param {Object[]} messages The messages queue.
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* @returns {Object} Modified config object
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*/
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function modifyConfigsFromComments(filename, ast, config, reportingConfig, messages) {
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let 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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ast.comments.forEach(function(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.substring(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-env":
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Object.assign(commentConfig.env, parseListConfig(value));
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break;
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case "eslint-disable":
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disableReporting(reportingConfig, comment.loc.start, Object.keys(parseListConfig(value)));
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break;
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case "eslint-enable":
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enableReporting(reportingConfig, comment.loc.start, Object.keys(parseListConfig(value)));
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break;
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case "eslint": {
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const items = parseJsonConfig(value, comment.loc, messages);
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Object.keys(items).forEach(function(name) {
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const ruleValue = items[name];
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validator.validateRuleOptions(name, ruleValue, filename + " line " + comment.loc.start.line);
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commentRules[name] = ruleValue;
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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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disableReporting(reportingConfig, { line: comment.loc.start.line, column: 0 }, Object.keys(parseListConfig(value)));
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enableReporting(reportingConfig, comment.loc.end, Object.keys(parseListConfig(value)));
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} else if (match[1] === "eslint-disable-next-line") {
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disableReporting(reportingConfig, comment.loc.start, Object.keys(parseListConfig(value)));
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enableReporting(reportingConfig, { line: comment.loc.start.line + 2 }, Object.keys(parseListConfig(value)));
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}
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}
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}
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});
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// apply environment configs
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Object.keys(commentConfig.env).forEach(function(name) {
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const env = Environments.get(name);
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if (env) {
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commentConfig = ConfigOps.merge(commentConfig, env);
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}
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});
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Object.assign(commentConfig.rules, commentRules);
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return ConfigOps.merge(config, commentConfig);
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}
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/**
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* Check if message of rule with ruleId should be ignored in location
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* @param {Object[]} reportingConfig Collection of ignore records
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* @param {string} ruleId Id of rule
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* @param {Object} location Location of message
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* @returns {boolean} True if message should be ignored, false otherwise
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*/
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function isDisabledByReportingConfig(reportingConfig, ruleId, location) {
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for (let i = 0, c = reportingConfig.length; i < c; i++) {
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const ignore = reportingConfig[i];
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if ((!ignore.rule || ignore.rule === ruleId) &&
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(location.line > ignore.start.line || (location.line === ignore.start.line && location.column >= ignore.start.column)) &&
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(!ignore.end || (location.line < ignore.end.line || (location.line === ignore.end.line && location.column <= ignore.end.column)))) {
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return true;
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}
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}
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return false;
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}
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/**
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* Normalize ECMAScript version from the initial config
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* @param {number} ecmaVersion ECMAScript version from the initial config
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* @param {boolean} isModule Whether the source type is module or not
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* @returns {number} normalized ECMAScript version
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*/
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function normalizeEcmaVersion(ecmaVersion, isModule) {
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// Need at least ES6 for modules
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if (isModule && (!ecmaVersion || ecmaVersion < 6)) {
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ecmaVersion = 6;
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}
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// Calculate ECMAScript edition number from official year version starting with
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// ES2015, which corresponds with ES6 (or a difference of 2009).
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if (ecmaVersion >= 2015) {
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ecmaVersion -= 2009;
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}
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return ecmaVersion;
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}
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/**
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* Process initial config to make it safe to extend by file comment config
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* @param {Object} config Initial config
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* @returns {Object} Processed config
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*/
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function prepareConfig(config) {
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config.globals = config.globals || config.global || {};
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delete config.global;
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const copiedRules = {};
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let parserOptions = {};
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if (typeof config.rules === "object") {
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Object.keys(config.rules).forEach(function(k) {
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const rule = config.rules[k];
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|
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if (rule === null) {
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throw new Error("Invalid config for rule '" + k + "'\.");
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}
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if (Array.isArray(rule)) {
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copiedRules[k] = rule.slice();
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|
} else {
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|
copiedRules[k] = rule;
|
|
}
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});
|
|
}
|
|
|
|
// merge in environment parserOptions
|
|
if (typeof config.env === "object") {
|
|
Object.keys(config.env).forEach(function(envName) {
|
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const env = Environments.get(envName);
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if (config.env[envName] && env && env.parserOptions) {
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parserOptions = ConfigOps.merge(parserOptions, env.parserOptions);
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}
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});
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}
|
|
|
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const preparedConfig = {
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rules: copiedRules,
|
|
parser: config.parser || DEFAULT_PARSER,
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|
globals: ConfigOps.merge({}, config.globals),
|
|
env: ConfigOps.merge({}, config.env || {}),
|
|
settings: ConfigOps.merge({}, config.settings || {}),
|
|
parserOptions: ConfigOps.merge(parserOptions, config.parserOptions || {})
|
|
};
|
|
const isModule = preparedConfig.parserOptions.sourceType === "module";
|
|
|
|
if (isModule) {
|
|
if (!preparedConfig.parserOptions.ecmaFeatures) {
|
|
preparedConfig.parserOptions.ecmaFeatures = {};
|
|
}
|
|
|
|
// can't have global return inside of modules
|
|
preparedConfig.parserOptions.ecmaFeatures.globalReturn = false;
|
|
}
|
|
|
|
preparedConfig.parserOptions.ecmaVersion = normalizeEcmaVersion(preparedConfig.parserOptions.ecmaVersion, isModule);
|
|
|
|
return preparedConfig;
|
|
}
|
|
|
|
/**
|
|
* Provide a stub rule with a given message
|
|
* @param {string} message The message to be displayed for the rule
|
|
* @returns {Function} Stub rule function
|
|
*/
|
|
function createStubRule(message) {
|
|
|
|
/**
|
|
* Creates a fake rule object
|
|
* @param {Object} context context object for each rule
|
|
* @returns {Object} collection of node to listen on
|
|
*/
|
|
function createRuleModule(context) {
|
|
return {
|
|
Program(node) {
|
|
context.report(node, message);
|
|
}
|
|
};
|
|
}
|
|
|
|
if (message) {
|
|
return createRuleModule;
|
|
} else {
|
|
throw new Error("No message passed to stub rule");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Provide a rule replacement message
|
|
* @param {string} ruleId Name of the rule
|
|
* @returns {string} Message detailing rule replacement
|
|
*/
|
|
function getRuleReplacementMessage(ruleId) {
|
|
if (ruleId in replacements.rules) {
|
|
const newRules = replacements.rules[ruleId];
|
|
|
|
return "Rule \'" + ruleId + "\' was removed and replaced by: " + newRules.join(", ");
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Public Interface
|
|
//------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Object that is responsible for verifying JavaScript text
|
|
* @name eslint
|
|
*/
|
|
module.exports = (function() {
|
|
|
|
const api = Object.create(new EventEmitter());
|
|
let messages = [],
|
|
currentConfig = null,
|
|
currentScopes = null,
|
|
scopeMap = null,
|
|
scopeManager = null,
|
|
currentFilename = null,
|
|
traverser = null,
|
|
reportingConfig = [],
|
|
sourceCode = null;
|
|
|
|
/**
|
|
* 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} config The ESLint configuration object.
|
|
* @returns {ASTNode} The AST if successful or null if not.
|
|
* @private
|
|
*/
|
|
function parse(text, config) {
|
|
|
|
let parser,
|
|
parserOptions = {
|
|
loc: true,
|
|
range: true,
|
|
raw: true,
|
|
tokens: true,
|
|
comment: true,
|
|
attachComment: true
|
|
};
|
|
|
|
try {
|
|
parser = require(config.parser);
|
|
} catch (ex) {
|
|
messages.push({
|
|
ruleId: null,
|
|
fatal: true,
|
|
severity: 2,
|
|
source: null,
|
|
message: ex.message,
|
|
line: 0,
|
|
column: 0
|
|
});
|
|
|
|
return null;
|
|
}
|
|
|
|
// merge in any additional parser options
|
|
if (config.parserOptions) {
|
|
parserOptions = Object.assign({}, config.parserOptions, parserOptions);
|
|
}
|
|
|
|
/*
|
|
* 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 {
|
|
return parser.parse(text, parserOptions);
|
|
} catch (ex) {
|
|
|
|
// If the message includes a leading line number, strip it:
|
|
const message = ex.message.replace(/^line \d+:/i, "").trim();
|
|
const source = (ex.lineNumber) ? SourceCode.splitLines(text)[ex.lineNumber - 1] : null;
|
|
|
|
messages.push({
|
|
ruleId: null,
|
|
fatal: true,
|
|
severity: 2,
|
|
source,
|
|
message: "Parsing error: " + message,
|
|
|
|
line: ex.lineNumber,
|
|
column: ex.column
|
|
});
|
|
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the severity level of a rule (0 - none, 1 - warning, 2 - error)
|
|
* Returns 0 if the rule config is not valid (an Array or a number)
|
|
* @param {Array|number} ruleConfig rule configuration
|
|
* @returns {number} 0, 1, or 2, indicating rule severity
|
|
*/
|
|
function getRuleSeverity(ruleConfig) {
|
|
if (typeof ruleConfig === "number") {
|
|
return ruleConfig;
|
|
} else if (Array.isArray(ruleConfig)) {
|
|
return ruleConfig[0];
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
} else {
|
|
return [];
|
|
}
|
|
}
|
|
|
|
// set unlimited listeners (see https://github.com/eslint/eslint/issues/524)
|
|
api.setMaxListeners(0);
|
|
|
|
/**
|
|
* Resets the internal state of the object.
|
|
* @returns {void}
|
|
*/
|
|
api.reset = function() {
|
|
this.removeAllListeners();
|
|
messages = [];
|
|
currentConfig = null;
|
|
currentScopes = null;
|
|
scopeMap = null;
|
|
scopeManager = null;
|
|
traverser = null;
|
|
reportingConfig = [];
|
|
sourceCode = null;
|
|
};
|
|
|
|
/**
|
|
* 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 globalsto the code.
|
|
*/
|
|
|
|
/**
|
|
* 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.
|
|
* @returns {Object[]} The results as an array of messages or null if no messages.
|
|
*/
|
|
api.verify = function(textOrSourceCode, config, filenameOrOptions, saveState) {
|
|
const text = (typeof textOrSourceCode === "string") ? textOrSourceCode : null;
|
|
let ast,
|
|
shebang,
|
|
allowInlineConfig;
|
|
|
|
// evaluate arguments
|
|
if (typeof filenameOrOptions === "object") {
|
|
currentFilename = filenameOrOptions.filename;
|
|
allowInlineConfig = filenameOrOptions.allowInlineConfig;
|
|
saveState = filenameOrOptions.saveState;
|
|
} else {
|
|
currentFilename = filenameOrOptions;
|
|
}
|
|
|
|
if (!saveState) {
|
|
this.reset();
|
|
}
|
|
|
|
// search and apply "eslint-env *".
|
|
const envInFile = findEslintEnv(text || textOrSourceCode.text);
|
|
|
|
if (envInFile) {
|
|
if (!config || !config.env) {
|
|
config = Object.assign({}, config || {}, {env: envInFile});
|
|
} else {
|
|
config = Object.assign({}, config);
|
|
config.env = Object.assign({}, config.env, envInFile);
|
|
}
|
|
}
|
|
|
|
// process initial config to make it safe to extend
|
|
config = prepareConfig(config || {});
|
|
|
|
// only do this for text
|
|
if (text !== null) {
|
|
|
|
// there's no input, just exit here
|
|
if (text.trim().length === 0) {
|
|
sourceCode = new SourceCode(text, blankScriptAST);
|
|
return messages;
|
|
}
|
|
|
|
ast = parse(
|
|
stripUnicodeBOM(text).replace(/^#!([^\r\n]+)/, function(match, captured) {
|
|
shebang = captured;
|
|
return "//" + captured;
|
|
}),
|
|
config
|
|
);
|
|
|
|
if (ast) {
|
|
sourceCode = new SourceCode(text, ast);
|
|
}
|
|
|
|
} else {
|
|
sourceCode = textOrSourceCode;
|
|
ast = sourceCode.ast;
|
|
}
|
|
|
|
// if espree failed to parse the file, there's no sense in setting up rules
|
|
if (ast) {
|
|
|
|
// parse global comments and modify config
|
|
if (allowInlineConfig !== false) {
|
|
config = modifyConfigsFromComments(currentFilename, ast, config, reportingConfig, messages);
|
|
}
|
|
|
|
// ensure that severities are normalized in the config
|
|
ConfigOps.normalize(config);
|
|
|
|
// enable appropriate rules
|
|
Object.keys(config.rules).filter(function(key) {
|
|
return getRuleSeverity(config.rules[key]) > 0;
|
|
}).forEach(function(key) {
|
|
let ruleCreator;
|
|
|
|
ruleCreator = rules.get(key);
|
|
|
|
if (!ruleCreator) {
|
|
const replacementMsg = getRuleReplacementMessage(key);
|
|
|
|
if (replacementMsg) {
|
|
ruleCreator = createStubRule(replacementMsg);
|
|
} else {
|
|
ruleCreator = createStubRule("Definition for rule '" + key + "' was not found");
|
|
}
|
|
rules.define(key, ruleCreator);
|
|
}
|
|
|
|
const severity = getRuleSeverity(config.rules[key]);
|
|
const options = getRuleOptions(config.rules[key]);
|
|
|
|
try {
|
|
const ruleContext = new RuleContext(
|
|
key, api, severity, options,
|
|
config.settings, config.parserOptions, config.parser, ruleCreator.meta);
|
|
|
|
const rule = ruleCreator.create ? ruleCreator.create(ruleContext) :
|
|
ruleCreator(ruleContext);
|
|
|
|
// add all the node types as listeners
|
|
Object.keys(rule).forEach(function(nodeType) {
|
|
api.on(nodeType, timing.enabled
|
|
? timing.time(key, rule[nodeType])
|
|
: rule[nodeType]
|
|
);
|
|
});
|
|
} catch (ex) {
|
|
ex.message = "Error while loading rule '" + key + "': " + ex.message;
|
|
throw ex;
|
|
}
|
|
});
|
|
|
|
// save config so rules can access as necessary
|
|
currentConfig = config;
|
|
traverser = new Traverser();
|
|
|
|
const ecmaFeatures = currentConfig.parserOptions.ecmaFeatures || {};
|
|
const ecmaVersion = currentConfig.parserOptions.ecmaVersion || 5;
|
|
|
|
// gather scope data that may be needed by the rules
|
|
scopeManager = escope.analyze(ast, {
|
|
ignoreEval: true,
|
|
nodejsScope: ecmaFeatures.globalReturn,
|
|
impliedStrict: ecmaFeatures.impliedStrict,
|
|
ecmaVersion,
|
|
sourceType: currentConfig.parserOptions.sourceType || "script",
|
|
fallback: Traverser.getKeys
|
|
});
|
|
|
|
currentScopes = scopeManager.scopes;
|
|
|
|
/*
|
|
* Index the scopes by the start range of their block for efficient
|
|
* lookup in getScope.
|
|
*/
|
|
scopeMap = [];
|
|
|
|
currentScopes.forEach(function(scope, index) {
|
|
const range = scope.block.range[0];
|
|
|
|
/*
|
|
* Sometimes two scopes are returned for a given node. This is
|
|
* handled later in a known way, so just don't overwrite here.
|
|
*/
|
|
if (!scopeMap[range]) {
|
|
scopeMap[range] = index;
|
|
}
|
|
});
|
|
|
|
// augment global scope with declared global variables
|
|
addDeclaredGlobals(ast, currentScopes[0], currentConfig);
|
|
|
|
// remove shebang comments
|
|
if (shebang && ast.comments.length && ast.comments[0].value === shebang) {
|
|
ast.comments.splice(0, 1);
|
|
|
|
if (ast.body.length && ast.body[0].leadingComments && ast.body[0].leadingComments[0].value === shebang) {
|
|
ast.body[0].leadingComments.splice(0, 1);
|
|
}
|
|
}
|
|
|
|
let eventGenerator = new NodeEventGenerator(api);
|
|
|
|
eventGenerator = new CodePathAnalyzer(eventGenerator);
|
|
eventGenerator = new CommentEventGenerator(eventGenerator, sourceCode);
|
|
|
|
/*
|
|
* 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(ast, {
|
|
enter(node, parent) {
|
|
node.parent = parent;
|
|
eventGenerator.enterNode(node);
|
|
},
|
|
leave(node) {
|
|
eventGenerator.leaveNode(node);
|
|
}
|
|
});
|
|
}
|
|
|
|
// sort by line and column
|
|
messages.sort(function(a, b) {
|
|
const lineDiff = a.line - b.line;
|
|
|
|
if (lineDiff === 0) {
|
|
return a.column - b.column;
|
|
} else {
|
|
return lineDiff;
|
|
}
|
|
});
|
|
|
|
return messages;
|
|
};
|
|
|
|
/**
|
|
* Reports a message from one of the rules.
|
|
* @param {string} ruleId The ID of the rule causing the message.
|
|
* @param {number} severity The severity level of the rule as configured.
|
|
* @param {ASTNode} node The AST node that the message relates to.
|
|
* @param {Object=} location An object containing the error line and column
|
|
* numbers. If location is not provided the node's start location will
|
|
* be used.
|
|
* @param {string} message The actual message.
|
|
* @param {Object} opts Optional template data which produces a formatted message
|
|
* with symbols being replaced by this object's values.
|
|
* @param {Object} fix A fix command description.
|
|
* @param {Object} meta Metadata of the rule
|
|
* @returns {void}
|
|
*/
|
|
api.report = function(ruleId, severity, node, location, message, opts, fix, meta) {
|
|
if (node) {
|
|
assert.strictEqual(typeof node, "object", "Node must be an object");
|
|
}
|
|
|
|
if (typeof location === "string") {
|
|
assert.ok(node, "Node must be provided when reporting error if location is not provided");
|
|
|
|
meta = fix;
|
|
fix = opts;
|
|
opts = message;
|
|
message = location;
|
|
location = node.loc.start;
|
|
}
|
|
|
|
// Store end location.
|
|
const endLocation = location.end;
|
|
|
|
location = location.start || location;
|
|
|
|
if (isDisabledByReportingConfig(reportingConfig, ruleId, location)) {
|
|
return;
|
|
}
|
|
|
|
if (opts) {
|
|
message = message.replace(/\{\{\s*(.+?)\s*\}\}/g, function(fullMatch, term) {
|
|
if (term in opts) {
|
|
return opts[term];
|
|
}
|
|
|
|
// Preserve old behavior: If parameter name not provided, don't replace it.
|
|
return fullMatch;
|
|
});
|
|
}
|
|
|
|
const problem = {
|
|
ruleId,
|
|
severity,
|
|
message,
|
|
line: location.line,
|
|
column: location.column + 1, // switch to 1-base instead of 0-base
|
|
nodeType: node && node.type,
|
|
source: sourceCode.lines[location.line - 1] || ""
|
|
};
|
|
|
|
// Define endLine and endColumn if exists.
|
|
if (endLocation) {
|
|
problem.endLine = endLocation.line;
|
|
problem.endColumn = endLocation.column + 1; // switch to 1-base instead of 0-base
|
|
}
|
|
|
|
// ensure there's range and text properties, otherwise it's not a valid fix
|
|
if (fix && Array.isArray(fix.range) && (typeof fix.text === "string")) {
|
|
|
|
// If rule uses fix, has metadata, but has no metadata.fixable, we should throw
|
|
if (meta && !meta.fixable) {
|
|
throw new Error("Fixable rules should export a `meta.fixable` property.");
|
|
}
|
|
|
|
problem.fix = fix;
|
|
}
|
|
|
|
messages.push(problem);
|
|
};
|
|
|
|
/**
|
|
* Gets the SourceCode object representing the parsed source.
|
|
* @returns {SourceCode} The SourceCode object.
|
|
*/
|
|
api.getSourceCode = function() {
|
|
return sourceCode;
|
|
};
|
|
|
|
// methods that exist on SourceCode object
|
|
const externalMethods = {
|
|
getSource: "getText",
|
|
getSourceLines: "getLines",
|
|
getAllComments: "getAllComments",
|
|
getNodeByRangeIndex: "getNodeByRangeIndex",
|
|
getComments: "getComments",
|
|
getJSDocComment: "getJSDocComment",
|
|
getFirstToken: "getFirstToken",
|
|
getFirstTokens: "getFirstTokens",
|
|
getLastToken: "getLastToken",
|
|
getLastTokens: "getLastTokens",
|
|
getTokenAfter: "getTokenAfter",
|
|
getTokenBefore: "getTokenBefore",
|
|
getTokenByRangeStart: "getTokenByRangeStart",
|
|
getTokens: "getTokens",
|
|
getTokensAfter: "getTokensAfter",
|
|
getTokensBefore: "getTokensBefore",
|
|
getTokensBetween: "getTokensBetween"
|
|
};
|
|
|
|
// copy over methods
|
|
Object.keys(externalMethods).forEach(function(methodName) {
|
|
const exMethodName = externalMethods[methodName];
|
|
|
|
// All functions expected to have less arguments than 5.
|
|
api[methodName] = function(a, b, c, d, e) {
|
|
if (sourceCode) {
|
|
return sourceCode[exMethodName](a, b, c, d, e);
|
|
}
|
|
return null;
|
|
};
|
|
});
|
|
|
|
/**
|
|
* Gets nodes that are ancestors of current node.
|
|
* @returns {ASTNode[]} Array of objects representing ancestors.
|
|
*/
|
|
api.getAncestors = function() {
|
|
return traverser.parents();
|
|
};
|
|
|
|
/**
|
|
* Gets the scope for the current node.
|
|
* @returns {Object} An object representing the current node's scope.
|
|
*/
|
|
api.getScope = function() {
|
|
const parents = traverser.parents();
|
|
|
|
// Don't do this for Program nodes - they have no parents
|
|
if (parents.length) {
|
|
|
|
// if current node introduces a scope, add it to the list
|
|
const current = traverser.current();
|
|
|
|
if (currentConfig.parserOptions.ecmaVersion >= 6) {
|
|
if (["BlockStatement", "SwitchStatement", "CatchClause", "FunctionDeclaration", "FunctionExpression", "ArrowFunctionExpression"].indexOf(current.type) >= 0) {
|
|
parents.push(current);
|
|
}
|
|
} else {
|
|
if (["FunctionDeclaration", "FunctionExpression", "ArrowFunctionExpression"].indexOf(current.type) >= 0) {
|
|
parents.push(current);
|
|
}
|
|
}
|
|
|
|
// Ascend the current node's parents
|
|
for (let i = parents.length - 1; i >= 0; --i) {
|
|
|
|
// Get the innermost scope
|
|
const scope = scopeManager.acquire(parents[i], true);
|
|
|
|
if (scope) {
|
|
if (scope.type === "function-expression-name") {
|
|
return scope.childScopes[0];
|
|
} else {
|
|
return scope;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return currentScopes[0];
|
|
};
|
|
|
|
/**
|
|
* Record that a particular variable has been used in code
|
|
* @param {string} name The name of the variable to mark as used
|
|
* @returns {boolean} True if the variable was found and marked as used,
|
|
* false if not.
|
|
*/
|
|
api.markVariableAsUsed = function(name) {
|
|
const hasGlobalReturn = currentConfig.parserOptions.ecmaFeatures && currentConfig.parserOptions.ecmaFeatures.globalReturn,
|
|
specialScope = hasGlobalReturn || currentConfig.parserOptions.sourceType === "module";
|
|
let scope = this.getScope(),
|
|
i,
|
|
len;
|
|
|
|
// Special Node.js scope means we need to start one level deeper
|
|
if (scope.type === "global" && specialScope) {
|
|
scope = scope.childScopes[0];
|
|
}
|
|
|
|
do {
|
|
const variables = scope.variables;
|
|
|
|
for (i = 0, len = variables.length; i < len; i++) {
|
|
if (variables[i].name === name) {
|
|
variables[i].eslintUsed = true;
|
|
return true;
|
|
}
|
|
}
|
|
} while ((scope = scope.upper));
|
|
|
|
return false;
|
|
};
|
|
|
|
/**
|
|
* Gets the filename for the currently parsed source.
|
|
* @returns {string} The filename associated with the source being parsed.
|
|
* Defaults to "<input>" if no filename info is present.
|
|
*/
|
|
api.getFilename = function() {
|
|
if (typeof currentFilename === "string") {
|
|
return currentFilename;
|
|
} else {
|
|
return "<input>";
|
|
}
|
|
};
|
|
|
|
/**
|
|
* 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}
|
|
*/
|
|
const defineRule = api.defineRule = function(ruleId, ruleModule) {
|
|
rules.define(ruleId, ruleModule);
|
|
};
|
|
|
|
/**
|
|
* Defines many new linting rules.
|
|
* @param {Object} rulesToDefine map from unique rule identifier to rule
|
|
* @returns {void}
|
|
*/
|
|
api.defineRules = function(rulesToDefine) {
|
|
Object.getOwnPropertyNames(rulesToDefine).forEach(function(ruleId) {
|
|
defineRule(ruleId, rulesToDefine[ruleId]);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Gets the default eslint configuration.
|
|
* @returns {Object} Object mapping rule IDs to their default configurations
|
|
*/
|
|
api.defaults = function() {
|
|
return require("../conf/eslint.json");
|
|
};
|
|
|
|
/**
|
|
* Gets variables that are declared by a specified node.
|
|
*
|
|
* The variables are its `defs[].node` or `defs[].parent` is same as the specified node.
|
|
* Specifically, below:
|
|
*
|
|
* - `VariableDeclaration` - variables of its all declarators.
|
|
* - `VariableDeclarator` - variables.
|
|
* - `FunctionDeclaration`/`FunctionExpression` - its function name and parameters.
|
|
* - `ArrowFunctionExpression` - its parameters.
|
|
* - `ClassDeclaration`/`ClassExpression` - its class name.
|
|
* - `CatchClause` - variables of its exception.
|
|
* - `ImportDeclaration` - variables of its all specifiers.
|
|
* - `ImportSpecifier`/`ImportDefaultSpecifier`/`ImportNamespaceSpecifier` - a variable.
|
|
* - others - always an empty array.
|
|
*
|
|
* @param {ASTNode} node A node to get.
|
|
* @returns {escope.Variable[]} Variables that are declared by the node.
|
|
*/
|
|
api.getDeclaredVariables = function(node) {
|
|
return (scopeManager && scopeManager.getDeclaredVariables(node)) || [];
|
|
};
|
|
|
|
return api;
|
|
|
|
}());
|
|
|