106 lines
3.1 KiB
JavaScript
106 lines
3.1 KiB
JavaScript
/**
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* @fileoverview A collection of methods for processing Espree's options.
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* @author Kai Cataldo
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const DEFAULT_ECMA_VERSION = 5;
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const SUPPORTED_VERSIONS = [
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3,
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5,
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6,
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7,
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8,
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9,
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10,
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11,
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12
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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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* @throws {Error} throws an error if the ecmaVersion is invalid.
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* @returns {number} normalized ECMAScript version
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*/
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function normalizeEcmaVersion(ecmaVersion = DEFAULT_ECMA_VERSION) {
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if (typeof ecmaVersion !== "number") {
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throw new Error(`ecmaVersion must be a number. Received value of type ${typeof ecmaVersion} instead.`);
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}
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let version = ecmaVersion;
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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 (version >= 2015) {
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version -= 2009;
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}
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if (!SUPPORTED_VERSIONS.includes(version)) {
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throw new Error("Invalid ecmaVersion.");
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}
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return version;
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}
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/**
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* Normalize sourceType from the initial config
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* @param {string} sourceType to normalize
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* @throws {Error} throw an error if sourceType is invalid
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* @returns {string} normalized sourceType
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*/
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function normalizeSourceType(sourceType = "script") {
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if (sourceType === "script" || sourceType === "module") {
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return sourceType;
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}
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throw new Error("Invalid sourceType.");
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}
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/**
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* Normalize parserOptions
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* @param {Object} options the parser options to normalize
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* @throws {Error} throw an error if found invalid option.
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* @returns {Object} normalized options
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*/
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function normalizeOptions(options) {
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const ecmaVersion = normalizeEcmaVersion(options.ecmaVersion);
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const sourceType = normalizeSourceType(options.sourceType);
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const ranges = options.range === true;
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const locations = options.loc === true;
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if (sourceType === "module" && ecmaVersion < 6) {
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throw new Error("sourceType 'module' is not supported when ecmaVersion < 2015. Consider adding `{ ecmaVersion: 2015 }` to the parser options.");
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}
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return Object.assign({}, options, { ecmaVersion, sourceType, ranges, locations });
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}
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/**
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* Get the latest ECMAScript version supported by Espree.
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* @returns {number} The latest ECMAScript version.
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*/
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function getLatestEcmaVersion() {
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return SUPPORTED_VERSIONS[SUPPORTED_VERSIONS.length - 1];
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}
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/**
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* Get the list of ECMAScript versions supported by Espree.
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* @returns {number[]} An array containing the supported ECMAScript versions.
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*/
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function getSupportedEcmaVersions() {
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return [...SUPPORTED_VERSIONS];
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}
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//------------------------------------------------------------------------------
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// Public
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//------------------------------------------------------------------------------
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module.exports = {
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normalizeOptions,
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getLatestEcmaVersion,
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getSupportedEcmaVersions
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};
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