/**
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* @fileoverview Config Comment Parser
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* @author Nicholas C. Zakas
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*/
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/* eslint-disable class-methods-use-this*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const levn = require("levn"),
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ConfigOps = require("@eslint/eslintrc/lib/shared/config-ops");
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const debug = require("debug")("eslint:config-comment-parser");
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//------------------------------------------------------------------------------
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// Public Interface
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//------------------------------------------------------------------------------
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/**
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* Object to parse ESLint configuration comments inside JavaScript files.
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* @name ConfigCommentParser
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*/
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module.exports = class ConfigCommentParser {
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/**
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* Parses a list of "name:string_value" or/and "name" options divided by comma or
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* whitespace. Used for "global" and "exported" comments.
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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 string values, or null values if no value was provided
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*/
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parseStringConfig(string, comment) {
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debug("Parsing String config");
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const items = {};
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// Collapse whitespace around `:` and `,` to make parsing easier
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const trimmedString = string.replace(/\s*([:,])\s*/gu, "$1");
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trimmedString.split(/\s|,+/u).forEach(name => {
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if (!name) {
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return;
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}
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// value defaults to null (if not provided), e.g: "foo" => ["foo", null]
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const [key, value = null] = name.split(":");
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items[key] = { value, comment };
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});
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return items;
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}
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/**
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* Parses a JSON-like config.
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* @param {string} string The string to parse.
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* @param {Object} location Start line and column of comments for potential error message.
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* @returns {({success: true, config: Object}|{success: false, error: Problem})} Result map object
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*/
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parseJsonConfig(string, location) {
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debug("Parsing JSON config");
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let items = {};
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// Parses a JSON-like comment by the same way as parsing CLI option.
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try {
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items = levn.parse("Object", string) || {};
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// Some tests say that it should ignore invalid comments such as `/*eslint no-alert:abc*/`.
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// Also, commaless notations have invalid severity:
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// "no-alert: 2 no-console: 2" --> {"no-alert": "2 no-console: 2"}
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// Should ignore that case as well.
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if (ConfigOps.isEverySeverityValid(items)) {
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return {
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success: true,
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config: items
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};
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}
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} catch {
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debug("Levn parsing failed; falling back to manual parsing.");
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// ignore to parse the string by a fallback.
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}
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/*
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* Optionator cannot parse commaless notations.
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* But we are supporting that. So this is a fallback for that.
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*/
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items = {};
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const normalizedString = string.replace(/([-a-zA-Z0-9/]+):/gu, "\"$1\":").replace(/(\]|[0-9])\s+(?=")/u, "$1,");
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try {
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items = JSON.parse(`{${normalizedString}}`);
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} catch (ex) {
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debug("Manual parsing failed.");
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return {
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success: false,
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error: {
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ruleId: null,
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fatal: true,
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severity: 2,
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message: `Failed to parse JSON from '${normalizedString}': ${ex.message}`,
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line: location.start.line,
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column: location.start.column + 1
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}
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};
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}
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return {
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success: true,
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config: items
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};
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}
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/**
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* Parses a config of values separated by comma.
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* @param {string} string The string to parse.
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* @returns {Object} Result map of values and true values
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*/
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parseListConfig(string) {
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debug("Parsing list config");
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const items = {};
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// Collapse whitespace around commas
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string.replace(/\s*,\s*/gu, ",").split(/,+/u).forEach(name => {
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const trimmedName = name.trim();
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if (trimmedName) {
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items[trimmedName] = true;
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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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