638 lines
24 KiB
JavaScript
638 lines
24 KiB
JavaScript
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/**
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* @fileoverview Rule to enforce spacing before and after keywords.
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* @author Toru Nagashima
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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 astUtils = require("./utils/ast-utils"),
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keywords = require("./utils/keywords");
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//------------------------------------------------------------------------------
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// Constants
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//------------------------------------------------------------------------------
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const PREV_TOKEN = /^[)\]}>]$/u;
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const NEXT_TOKEN = /^(?:[([{<~!]|\+\+?|--?)$/u;
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const PREV_TOKEN_M = /^[)\]}>*]$/u;
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const NEXT_TOKEN_M = /^[{*]$/u;
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const TEMPLATE_OPEN_PAREN = /\$\{$/u;
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const TEMPLATE_CLOSE_PAREN = /^\}/u;
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const CHECK_TYPE = /^(?:JSXElement|RegularExpression|String|Template|PrivateIdentifier)$/u;
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const KEYS = keywords.concat(["as", "async", "await", "from", "get", "let", "of", "set", "yield"]);
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// check duplications.
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(function() {
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KEYS.sort();
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for (let i = 1; i < KEYS.length; ++i) {
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if (KEYS[i] === KEYS[i - 1]) {
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throw new Error(`Duplication was found in the keyword list: ${KEYS[i]}`);
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}
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}
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}());
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Checks whether or not a given token is a "Template" token ends with "${".
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* @param {Token} token A token to check.
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* @returns {boolean} `true` if the token is a "Template" token ends with "${".
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*/
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function isOpenParenOfTemplate(token) {
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return token.type === "Template" && TEMPLATE_OPEN_PAREN.test(token.value);
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}
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/**
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* Checks whether or not a given token is a "Template" token starts with "}".
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* @param {Token} token A token to check.
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* @returns {boolean} `true` if the token is a "Template" token starts with "}".
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*/
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function isCloseParenOfTemplate(token) {
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return token.type === "Template" && TEMPLATE_CLOSE_PAREN.test(token.value);
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}
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../shared/types').Rule} */
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module.exports = {
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meta: {
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type: "layout",
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docs: {
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description: "enforce consistent spacing before and after keywords",
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recommended: false,
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url: "https://eslint.org/docs/rules/keyword-spacing"
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},
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fixable: "whitespace",
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schema: [
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{
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type: "object",
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properties: {
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before: { type: "boolean", default: true },
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after: { type: "boolean", default: true },
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overrides: {
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type: "object",
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properties: KEYS.reduce((retv, key) => {
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retv[key] = {
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type: "object",
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properties: {
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before: { type: "boolean" },
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after: { type: "boolean" }
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},
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additionalProperties: false
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};
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return retv;
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}, {}),
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additionalProperties: false
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}
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},
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additionalProperties: false
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}
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],
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messages: {
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expectedBefore: "Expected space(s) before \"{{value}}\".",
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expectedAfter: "Expected space(s) after \"{{value}}\".",
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unexpectedBefore: "Unexpected space(s) before \"{{value}}\".",
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unexpectedAfter: "Unexpected space(s) after \"{{value}}\"."
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}
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},
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create(context) {
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const sourceCode = context.getSourceCode();
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const tokensToIgnore = new WeakSet();
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/**
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* Reports a given token if there are not space(s) before the token.
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* @param {Token} token A token to report.
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* @param {RegExp} pattern A pattern of the previous token to check.
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* @returns {void}
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*/
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function expectSpaceBefore(token, pattern) {
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const prevToken = sourceCode.getTokenBefore(token);
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if (prevToken &&
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(CHECK_TYPE.test(prevToken.type) || pattern.test(prevToken.value)) &&
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!isOpenParenOfTemplate(prevToken) &&
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!tokensToIgnore.has(prevToken) &&
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astUtils.isTokenOnSameLine(prevToken, token) &&
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!sourceCode.isSpaceBetweenTokens(prevToken, token)
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) {
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context.report({
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loc: token.loc,
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messageId: "expectedBefore",
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data: token,
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fix(fixer) {
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return fixer.insertTextBefore(token, " ");
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}
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});
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}
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}
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/**
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* Reports a given token if there are space(s) before the token.
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* @param {Token} token A token to report.
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* @param {RegExp} pattern A pattern of the previous token to check.
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* @returns {void}
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*/
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function unexpectSpaceBefore(token, pattern) {
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const prevToken = sourceCode.getTokenBefore(token);
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if (prevToken &&
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(CHECK_TYPE.test(prevToken.type) || pattern.test(prevToken.value)) &&
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!isOpenParenOfTemplate(prevToken) &&
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!tokensToIgnore.has(prevToken) &&
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astUtils.isTokenOnSameLine(prevToken, token) &&
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sourceCode.isSpaceBetweenTokens(prevToken, token)
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) {
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context.report({
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loc: { start: prevToken.loc.end, end: token.loc.start },
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messageId: "unexpectedBefore",
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data: token,
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fix(fixer) {
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return fixer.removeRange([prevToken.range[1], token.range[0]]);
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}
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});
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}
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}
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/**
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* Reports a given token if there are not space(s) after the token.
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* @param {Token} token A token to report.
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* @param {RegExp} pattern A pattern of the next token to check.
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* @returns {void}
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*/
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function expectSpaceAfter(token, pattern) {
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const nextToken = sourceCode.getTokenAfter(token);
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if (nextToken &&
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(CHECK_TYPE.test(nextToken.type) || pattern.test(nextToken.value)) &&
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!isCloseParenOfTemplate(nextToken) &&
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!tokensToIgnore.has(nextToken) &&
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astUtils.isTokenOnSameLine(token, nextToken) &&
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!sourceCode.isSpaceBetweenTokens(token, nextToken)
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) {
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context.report({
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loc: token.loc,
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messageId: "expectedAfter",
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data: token,
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fix(fixer) {
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return fixer.insertTextAfter(token, " ");
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}
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});
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}
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}
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/**
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* Reports a given token if there are space(s) after the token.
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* @param {Token} token A token to report.
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* @param {RegExp} pattern A pattern of the next token to check.
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* @returns {void}
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*/
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function unexpectSpaceAfter(token, pattern) {
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const nextToken = sourceCode.getTokenAfter(token);
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if (nextToken &&
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(CHECK_TYPE.test(nextToken.type) || pattern.test(nextToken.value)) &&
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!isCloseParenOfTemplate(nextToken) &&
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!tokensToIgnore.has(nextToken) &&
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astUtils.isTokenOnSameLine(token, nextToken) &&
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sourceCode.isSpaceBetweenTokens(token, nextToken)
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) {
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context.report({
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loc: { start: token.loc.end, end: nextToken.loc.start },
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messageId: "unexpectedAfter",
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data: token,
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fix(fixer) {
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return fixer.removeRange([token.range[1], nextToken.range[0]]);
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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 the option object and determines check methods for each keyword.
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* @param {Object|undefined} options The option object to parse.
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* @returns {Object} - Normalized option object.
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* Keys are keywords (there are for every keyword).
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* Values are instances of `{"before": function, "after": function}`.
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*/
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function parseOptions(options = {}) {
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const before = options.before !== false;
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const after = options.after !== false;
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const defaultValue = {
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before: before ? expectSpaceBefore : unexpectSpaceBefore,
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after: after ? expectSpaceAfter : unexpectSpaceAfter
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};
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const overrides = (options && options.overrides) || {};
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const retv = Object.create(null);
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for (let i = 0; i < KEYS.length; ++i) {
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const key = KEYS[i];
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const override = overrides[key];
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if (override) {
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const thisBefore = ("before" in override) ? override.before : before;
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const thisAfter = ("after" in override) ? override.after : after;
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retv[key] = {
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before: thisBefore ? expectSpaceBefore : unexpectSpaceBefore,
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after: thisAfter ? expectSpaceAfter : unexpectSpaceAfter
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};
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} else {
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retv[key] = defaultValue;
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}
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}
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return retv;
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}
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const checkMethodMap = parseOptions(context.options[0]);
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/**
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* Reports a given token if usage of spacing followed by the token is
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* invalid.
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* @param {Token} token A token to report.
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* @param {RegExp} [pattern] Optional. A pattern of the previous
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* token to check.
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* @returns {void}
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*/
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function checkSpacingBefore(token, pattern) {
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checkMethodMap[token.value].before(token, pattern || PREV_TOKEN);
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}
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/**
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* Reports a given token if usage of spacing preceded by the token is
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* invalid.
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* @param {Token} token A token to report.
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* @param {RegExp} [pattern] Optional. A pattern of the next
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* token to check.
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* @returns {void}
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*/
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function checkSpacingAfter(token, pattern) {
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checkMethodMap[token.value].after(token, pattern || NEXT_TOKEN);
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}
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/**
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* Reports a given token if usage of spacing around the token is invalid.
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* @param {Token} token A token to report.
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* @returns {void}
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*/
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function checkSpacingAround(token) {
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checkSpacingBefore(token);
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checkSpacingAfter(token);
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}
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/**
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* Reports the first token of a given node if the first token is a keyword
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* and usage of spacing around the token is invalid.
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* @param {ASTNode|null} node A node to report.
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* @returns {void}
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*/
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function checkSpacingAroundFirstToken(node) {
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const firstToken = node && sourceCode.getFirstToken(node);
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if (firstToken && firstToken.type === "Keyword") {
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checkSpacingAround(firstToken);
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}
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}
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/**
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* Reports the first token of a given node if the first token is a keyword
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* and usage of spacing followed by the token is invalid.
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*
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* This is used for unary operators (e.g. `typeof`), `function`, and `super`.
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* Other rules are handling usage of spacing preceded by those keywords.
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* @param {ASTNode|null} node A node to report.
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* @returns {void}
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*/
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function checkSpacingBeforeFirstToken(node) {
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const firstToken = node && sourceCode.getFirstToken(node);
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if (firstToken && firstToken.type === "Keyword") {
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checkSpacingBefore(firstToken);
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}
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}
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/**
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* Reports the previous token of a given node if the token is a keyword and
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* usage of spacing around the token is invalid.
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* @param {ASTNode|null} node A node to report.
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* @returns {void}
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*/
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function checkSpacingAroundTokenBefore(node) {
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if (node) {
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const token = sourceCode.getTokenBefore(node, astUtils.isKeywordToken);
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checkSpacingAround(token);
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}
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}
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/**
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* Reports `async` or `function` keywords of a given node if usage of
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* spacing around those keywords is invalid.
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* @param {ASTNode} node A node to report.
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* @returns {void}
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*/
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function checkSpacingForFunction(node) {
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const firstToken = node && sourceCode.getFirstToken(node);
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if (firstToken &&
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((firstToken.type === "Keyword" && firstToken.value === "function") ||
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firstToken.value === "async")
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) {
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checkSpacingBefore(firstToken);
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}
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}
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/**
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* Reports `class` and `extends` keywords of a given node if usage of
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* spacing around those keywords is invalid.
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* @param {ASTNode} node A node to report.
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* @returns {void}
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*/
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function checkSpacingForClass(node) {
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checkSpacingAroundFirstToken(node);
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checkSpacingAroundTokenBefore(node.superClass);
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}
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/**
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* Reports `if` and `else` keywords of a given node if usage of spacing
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* around those keywords is invalid.
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* @param {ASTNode} node A node to report.
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* @returns {void}
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*/
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function checkSpacingForIfStatement(node) {
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checkSpacingAroundFirstToken(node);
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checkSpacingAroundTokenBefore(node.alternate);
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}
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/**
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* Reports `try`, `catch`, and `finally` keywords of a given node if usage
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* of spacing around those keywords is invalid.
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* @param {ASTNode} node A node to report.
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* @returns {void}
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*/
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function checkSpacingForTryStatement(node) {
|
||
|
|
checkSpacingAroundFirstToken(node);
|
||
|
|
checkSpacingAroundFirstToken(node.handler);
|
||
|
|
checkSpacingAroundTokenBefore(node.finalizer);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reports `do` and `while` keywords of a given node if usage of spacing
|
||
|
|
* around those keywords is invalid.
|
||
|
|
* @param {ASTNode} node A node to report.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function checkSpacingForDoWhileStatement(node) {
|
||
|
|
checkSpacingAroundFirstToken(node);
|
||
|
|
checkSpacingAroundTokenBefore(node.test);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reports `for` and `in` keywords of a given node if usage of spacing
|
||
|
|
* around those keywords is invalid.
|
||
|
|
* @param {ASTNode} node A node to report.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function checkSpacingForForInStatement(node) {
|
||
|
|
checkSpacingAroundFirstToken(node);
|
||
|
|
|
||
|
|
const inToken = sourceCode.getTokenBefore(node.right, astUtils.isNotOpeningParenToken);
|
||
|
|
const previousToken = sourceCode.getTokenBefore(inToken);
|
||
|
|
|
||
|
|
if (previousToken.type !== "PrivateIdentifier") {
|
||
|
|
checkSpacingBefore(inToken);
|
||
|
|
}
|
||
|
|
|
||
|
|
checkSpacingAfter(inToken);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reports `for` and `of` keywords of a given node if usage of spacing
|
||
|
|
* around those keywords is invalid.
|
||
|
|
* @param {ASTNode} node A node to report.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function checkSpacingForForOfStatement(node) {
|
||
|
|
if (node.await) {
|
||
|
|
checkSpacingBefore(sourceCode.getFirstToken(node, 0));
|
||
|
|
checkSpacingAfter(sourceCode.getFirstToken(node, 1));
|
||
|
|
} else {
|
||
|
|
checkSpacingAroundFirstToken(node);
|
||
|
|
}
|
||
|
|
|
||
|
|
const ofToken = sourceCode.getTokenBefore(node.right, astUtils.isNotOpeningParenToken);
|
||
|
|
const previousToken = sourceCode.getTokenBefore(ofToken);
|
||
|
|
|
||
|
|
if (previousToken.type !== "PrivateIdentifier") {
|
||
|
|
checkSpacingBefore(ofToken);
|
||
|
|
}
|
||
|
|
|
||
|
|
checkSpacingAfter(ofToken);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reports `import`, `export`, `as`, and `from` keywords of a given node if
|
||
|
|
* usage of spacing around those keywords is invalid.
|
||
|
|
*
|
||
|
|
* This rule handles the `*` token in module declarations.
|
||
|
|
*
|
||
|
|
* import*as A from "./a"; /*error Expected space(s) after "import".
|
||
|
|
* error Expected space(s) before "as".
|
||
|
|
* @param {ASTNode} node A node to report.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function checkSpacingForModuleDeclaration(node) {
|
||
|
|
const firstToken = sourceCode.getFirstToken(node);
|
||
|
|
|
||
|
|
checkSpacingBefore(firstToken, PREV_TOKEN_M);
|
||
|
|
checkSpacingAfter(firstToken, NEXT_TOKEN_M);
|
||
|
|
|
||
|
|
if (node.type === "ExportDefaultDeclaration") {
|
||
|
|
checkSpacingAround(sourceCode.getTokenAfter(firstToken));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (node.type === "ExportAllDeclaration" && node.exported) {
|
||
|
|
const asToken = sourceCode.getTokenBefore(node.exported);
|
||
|
|
|
||
|
|
checkSpacingBefore(asToken, PREV_TOKEN_M);
|
||
|
|
checkSpacingAfter(asToken, NEXT_TOKEN_M);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (node.source) {
|
||
|
|
const fromToken = sourceCode.getTokenBefore(node.source);
|
||
|
|
|
||
|
|
checkSpacingBefore(fromToken, PREV_TOKEN_M);
|
||
|
|
checkSpacingAfter(fromToken, NEXT_TOKEN_M);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reports `as` keyword of a given node if usage of spacing around this
|
||
|
|
* keyword is invalid.
|
||
|
|
* @param {ASTNode} node An `ImportSpecifier` node to check.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function checkSpacingForImportSpecifier(node) {
|
||
|
|
if (node.imported.range[0] !== node.local.range[0]) {
|
||
|
|
const asToken = sourceCode.getTokenBefore(node.local);
|
||
|
|
|
||
|
|
checkSpacingBefore(asToken, PREV_TOKEN_M);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reports `as` keyword of a given node if usage of spacing around this
|
||
|
|
* keyword is invalid.
|
||
|
|
* @param {ASTNode} node An `ExportSpecifier` node to check.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function checkSpacingForExportSpecifier(node) {
|
||
|
|
if (node.local.range[0] !== node.exported.range[0]) {
|
||
|
|
const asToken = sourceCode.getTokenBefore(node.exported);
|
||
|
|
|
||
|
|
checkSpacingBefore(asToken, PREV_TOKEN_M);
|
||
|
|
checkSpacingAfter(asToken, NEXT_TOKEN_M);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reports `as` keyword of a given node if usage of spacing around this
|
||
|
|
* keyword is invalid.
|
||
|
|
* @param {ASTNode} node A node to report.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function checkSpacingForImportNamespaceSpecifier(node) {
|
||
|
|
const asToken = sourceCode.getFirstToken(node, 1);
|
||
|
|
|
||
|
|
checkSpacingBefore(asToken, PREV_TOKEN_M);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reports `static`, `get`, and `set` keywords of a given node if usage of
|
||
|
|
* spacing around those keywords is invalid.
|
||
|
|
* @param {ASTNode} node A node to report.
|
||
|
|
* @throws {Error} If unable to find token get, set, or async beside method name.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function checkSpacingForProperty(node) {
|
||
|
|
if (node.static) {
|
||
|
|
checkSpacingAroundFirstToken(node);
|
||
|
|
}
|
||
|
|
if (node.kind === "get" ||
|
||
|
|
node.kind === "set" ||
|
||
|
|
(
|
||
|
|
(node.method || node.type === "MethodDefinition") &&
|
||
|
|
node.value.async
|
||
|
|
)
|
||
|
|
) {
|
||
|
|
const token = sourceCode.getTokenBefore(
|
||
|
|
node.key,
|
||
|
|
tok => {
|
||
|
|
switch (tok.value) {
|
||
|
|
case "get":
|
||
|
|
case "set":
|
||
|
|
case "async":
|
||
|
|
return true;
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
);
|
||
|
|
|
||
|
|
if (!token) {
|
||
|
|
throw new Error("Failed to find token get, set, or async beside method name");
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
checkSpacingAround(token);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Reports `await` keyword of a given node if usage of spacing before
|
||
|
|
* this keyword is invalid.
|
||
|
|
* @param {ASTNode} node A node to report.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function checkSpacingForAwaitExpression(node) {
|
||
|
|
checkSpacingBefore(sourceCode.getFirstToken(node));
|
||
|
|
}
|
||
|
|
|
||
|
|
return {
|
||
|
|
|
||
|
|
// Statements
|
||
|
|
DebuggerStatement: checkSpacingAroundFirstToken,
|
||
|
|
WithStatement: checkSpacingAroundFirstToken,
|
||
|
|
|
||
|
|
// Statements - Control flow
|
||
|
|
BreakStatement: checkSpacingAroundFirstToken,
|
||
|
|
ContinueStatement: checkSpacingAroundFirstToken,
|
||
|
|
ReturnStatement: checkSpacingAroundFirstToken,
|
||
|
|
ThrowStatement: checkSpacingAroundFirstToken,
|
||
|
|
TryStatement: checkSpacingForTryStatement,
|
||
|
|
|
||
|
|
// Statements - Choice
|
||
|
|
IfStatement: checkSpacingForIfStatement,
|
||
|
|
SwitchStatement: checkSpacingAroundFirstToken,
|
||
|
|
SwitchCase: checkSpacingAroundFirstToken,
|
||
|
|
|
||
|
|
// Statements - Loops
|
||
|
|
DoWhileStatement: checkSpacingForDoWhileStatement,
|
||
|
|
ForInStatement: checkSpacingForForInStatement,
|
||
|
|
ForOfStatement: checkSpacingForForOfStatement,
|
||
|
|
ForStatement: checkSpacingAroundFirstToken,
|
||
|
|
WhileStatement: checkSpacingAroundFirstToken,
|
||
|
|
|
||
|
|
// Statements - Declarations
|
||
|
|
ClassDeclaration: checkSpacingForClass,
|
||
|
|
ExportNamedDeclaration: checkSpacingForModuleDeclaration,
|
||
|
|
ExportDefaultDeclaration: checkSpacingForModuleDeclaration,
|
||
|
|
ExportAllDeclaration: checkSpacingForModuleDeclaration,
|
||
|
|
FunctionDeclaration: checkSpacingForFunction,
|
||
|
|
ImportDeclaration: checkSpacingForModuleDeclaration,
|
||
|
|
VariableDeclaration: checkSpacingAroundFirstToken,
|
||
|
|
|
||
|
|
// Expressions
|
||
|
|
ArrowFunctionExpression: checkSpacingForFunction,
|
||
|
|
AwaitExpression: checkSpacingForAwaitExpression,
|
||
|
|
ClassExpression: checkSpacingForClass,
|
||
|
|
FunctionExpression: checkSpacingForFunction,
|
||
|
|
NewExpression: checkSpacingBeforeFirstToken,
|
||
|
|
Super: checkSpacingBeforeFirstToken,
|
||
|
|
ThisExpression: checkSpacingBeforeFirstToken,
|
||
|
|
UnaryExpression: checkSpacingBeforeFirstToken,
|
||
|
|
YieldExpression: checkSpacingBeforeFirstToken,
|
||
|
|
|
||
|
|
// Others
|
||
|
|
ImportSpecifier: checkSpacingForImportSpecifier,
|
||
|
|
ExportSpecifier: checkSpacingForExportSpecifier,
|
||
|
|
ImportNamespaceSpecifier: checkSpacingForImportNamespaceSpecifier,
|
||
|
|
MethodDefinition: checkSpacingForProperty,
|
||
|
|
PropertyDefinition: checkSpacingForProperty,
|
||
|
|
StaticBlock: checkSpacingAroundFirstToken,
|
||
|
|
Property: checkSpacingForProperty,
|
||
|
|
|
||
|
|
// To avoid conflicts with `space-infix-ops`, e.g. `a > this.b`
|
||
|
|
"BinaryExpression[operator='>']"(node) {
|
||
|
|
const operatorToken = sourceCode.getTokenBefore(node.right, astUtils.isNotOpeningParenToken);
|
||
|
|
|
||
|
|
tokensToIgnore.add(operatorToken);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
};
|