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/** * @fileoverview Config Comment Parser * @author Nicholas C. Zakas */ /* eslint class-methods-use-this: off -- Methods desired on instance */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const levn = require("levn"), { Legacy: { ConfigOps } } = require("@eslint/eslintrc/universal"), { directivesPattern } = require("../shared/directives"); const debug = require("debug")("eslint:config-comment-parser"); //------------------------------------------------------------------------------ // Typedefs //------------------------------------------------------------------------------ /** @typedef {import("../shared/types").LintMessage} LintMessage */ //------------------------------------------------------------------------------ // Public Interface //------------------------------------------------------------------------------ /** * Object to parse ESLint configuration comments inside JavaScript files. * @name ConfigCommentParser */ module.exports = class ConfigCommentParser { /** * Parses a list of "name:string_value" or/and "name" options divided by comma or * whitespace. Used for "global" and "exported" comments. * @param {string} string The string to parse. * @param {Comment} comment The comment node which has the string. * @returns {Object} Result map object of names and string values, or null values if no value was provided */ parseStringConfig(string, comment) { debug("Parsing String config"); const items = {}; // Collapse whitespace around `:` and `,` to make parsing easier const trimmedString = string.replace(/\s*([:,])\s*/gu, "$1"); trimmedString.split(/\s|,+/u).forEach(name => { if (!name) { return; } // value defaults to null (if not provided), e.g: "foo" => ["foo", null] const [key, value = null] = name.split(":"); items[key] = { value, comment }; }); return items; } /** * Parses a JSON-like config. * @param {string} string The string to parse. * @param {Object} location Start line and column of comments for potential error message. * @returns {({success: true, config: Object}|{success: false, error: LintMessage})} Result map object */ parseJsonConfig(string, location) { debug("Parsing JSON config"); let items = {}; // Parses a JSON-like comment by the same way as parsing CLI option. try { items = levn.parse("Object", string) || {}; // Some tests say that it should ignore invalid comments such as `/*eslint no-alert:abc*/`. // Also, commaless notations have invalid severity: // "no-alert: 2 no-console: 2" --> {"no-alert": "2 no-console: 2"} // Should ignore that case as well. if (ConfigOps.isEverySeverityValid(items)) { return { success: true, config: items }; } } catch { debug("Levn parsing failed; falling back to manual parsing."); // ignore to parse the string by a fallback. } /* * Optionator cannot parse commaless notations. * But we are supporting that. So this is a fallback for that. */ items = {}; const normalizedString = string.replace(/([-a-zA-Z0-9/]+):/gu, "\"$1\":").replace(/(\]|[0-9])\s+(?=")/u, "$1,"); try { items = JSON.parse(`{${normalizedString}}`); } catch (ex) { debug("Manual parsing failed."); return { success: false, error: { ruleId: null, fatal: true, severity: 2, message: `Failed to parse JSON from '${normalizedString}': ${ex.message}`, line: location.start.line, column: location.start.column + 1, nodeType: null } }; } return { success: true, config: items }; } /** * Parses a config of values separated by comma. * @param {string} string The string to parse. * @returns {Object} Result map of values and true values */ parseListConfig(string) { debug("Parsing list config"); const items = {}; string.split(",").forEach(name => { const trimmedName = name.trim().replace(/^(?<quote>['"]?)(?<ruleId>.*)\k<quote>$/us, "$<ruleId>"); if (trimmedName) { items[trimmedName] = true; } }); return items; } /** * Extract the directive and the justification from a given directive comment and trim them. * @param {string} value The comment text to extract. * @returns {{directivePart: string, justificationPart: string}} The extracted directive and justification. */ extractDirectiveComment(value) { const match = /\s-{2,}\s/u.exec(value); if (!match) { return { directivePart: value.trim(), justificationPart: "" }; } const directive = value.slice(0, match.index).trim(); const justification = value.slice(match.index + match[0].length).trim(); return { directivePart: directive, justificationPart: justification }; } /** * Parses a directive comment into directive text and value. * @param {Comment} comment The comment node with the directive to be parsed. * @returns {{directiveText: string, directiveValue: string}} The directive text and value. */ parseDirective(comment) { const { directivePart } = this.extractDirectiveComment(comment.value); const match = directivesPattern.exec(directivePart); const directiveText = match[1]; const directiveValue = directivePart.slice(match.index + directiveText.length); return { directiveText, directiveValue }; } };