275 lines
9.3 KiB
JavaScript
275 lines
9.3 KiB
JavaScript
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/**
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* @fileoverview Disallows or enforces spaces inside of parentheses.
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* @author Jonathan Rajavuori
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*/
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"use strict";
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const astUtils = require("../ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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docs: {
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description: "enforce consistent spacing inside parentheses",
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category: "Stylistic Issues",
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recommended: false
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},
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fixable: "whitespace",
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schema: [
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{
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enum: ["always", "never"]
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},
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{
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type: "object",
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properties: {
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exceptions: {
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type: "array",
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items: {
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enum: ["{}", "[]", "()", "empty"]
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},
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uniqueItems: true
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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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},
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create(context) {
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const MISSING_SPACE_MESSAGE = "There must be a space inside this paren.",
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REJECTED_SPACE_MESSAGE = "There should be no spaces inside this paren.",
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ALWAYS = context.options[0] === "always",
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exceptionsArrayOptions = (context.options[1] && context.options[1].exceptions) || [],
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options = {};
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let exceptions;
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if (exceptionsArrayOptions.length) {
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options.braceException = exceptionsArrayOptions.indexOf("{}") !== -1;
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options.bracketException = exceptionsArrayOptions.indexOf("[]") !== -1;
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options.parenException = exceptionsArrayOptions.indexOf("()") !== -1;
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options.empty = exceptionsArrayOptions.indexOf("empty") !== -1;
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}
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/**
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* Produces an object with the opener and closer exception values
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* @param {Object} opts The exception options
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* @returns {Object} `openers` and `closers` exception values
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* @private
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*/
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function getExceptions() {
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const openers = [],
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closers = [];
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if (options.braceException) {
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openers.push("{");
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closers.push("}");
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}
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if (options.bracketException) {
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openers.push("[");
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closers.push("]");
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}
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if (options.parenException) {
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openers.push("(");
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closers.push(")");
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}
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if (options.empty) {
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openers.push(")");
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closers.push("(");
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}
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return {
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openers,
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closers
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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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const sourceCode = context.getSourceCode();
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/**
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* Determines if a token is one of the exceptions for the opener paren
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* @param {Object} token The token to check
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* @returns {boolean} True if the token is one of the exceptions for the opener paren
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*/
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function isOpenerException(token) {
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return token.type === "Punctuator" && exceptions.openers.indexOf(token.value) >= 0;
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}
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/**
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* Determines if a token is one of the exceptions for the closer paren
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* @param {Object} token The token to check
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* @returns {boolean} True if the token is one of the exceptions for the closer paren
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*/
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function isCloserException(token) {
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return token.type === "Punctuator" && exceptions.closers.indexOf(token.value) >= 0;
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}
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/**
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* Determines if an opener paren should have a missing space after it
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* @param {Object} left The paren token
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* @param {Object} right The token after it
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* @returns {boolean} True if the paren should have a space
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*/
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function shouldOpenerHaveSpace(left, right) {
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if (sourceCode.isSpaceBetweenTokens(left, right)) {
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return false;
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}
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if (ALWAYS) {
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if (astUtils.isClosingParenToken(right)) {
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return false;
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}
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return !isOpenerException(right);
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}
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return isOpenerException(right);
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}
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/**
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* Determines if an closer paren should have a missing space after it
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* @param {Object} left The token before the paren
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* @param {Object} right The paren token
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* @returns {boolean} True if the paren should have a space
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*/
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function shouldCloserHaveSpace(left, right) {
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if (astUtils.isOpeningParenToken(left)) {
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return false;
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}
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if (sourceCode.isSpaceBetweenTokens(left, right)) {
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return false;
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}
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if (ALWAYS) {
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return !isCloserException(left);
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}
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return isCloserException(left);
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}
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/**
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* Determines if an opener paren should not have an existing space after it
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* @param {Object} left The paren token
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* @param {Object} right The token after it
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* @returns {boolean} True if the paren should reject the space
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*/
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function shouldOpenerRejectSpace(left, right) {
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if (right.type === "Line") {
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return false;
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}
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if (!astUtils.isTokenOnSameLine(left, right)) {
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return false;
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}
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if (!sourceCode.isSpaceBetweenTokens(left, right)) {
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return false;
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}
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if (ALWAYS) {
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return isOpenerException(right);
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}
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return !isOpenerException(right);
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}
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/**
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* Determines if an closer paren should not have an existing space after it
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* @param {Object} left The token before the paren
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* @param {Object} right The paren token
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* @returns {boolean} True if the paren should reject the space
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*/
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function shouldCloserRejectSpace(left, right) {
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if (astUtils.isOpeningParenToken(left)) {
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return false;
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}
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if (!astUtils.isTokenOnSameLine(left, right)) {
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return false;
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}
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if (!sourceCode.isSpaceBetweenTokens(left, right)) {
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return false;
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}
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if (ALWAYS) {
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return isCloserException(left);
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}
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return !isCloserException(left);
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}
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//--------------------------------------------------------------------------
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// Public
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//--------------------------------------------------------------------------
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return {
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Program: function checkParenSpaces(node) {
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exceptions = getExceptions();
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const tokens = sourceCode.tokensAndComments;
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tokens.forEach((token, i) => {
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const prevToken = tokens[i - 1];
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const nextToken = tokens[i + 1];
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if (!astUtils.isOpeningParenToken(token) && !astUtils.isClosingParenToken(token)) {
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return;
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}
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if (token.value === "(" && shouldOpenerHaveSpace(token, nextToken)) {
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context.report({
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node,
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loc: token.loc.start,
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message: MISSING_SPACE_MESSAGE,
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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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} else if (token.value === "(" && shouldOpenerRejectSpace(token, nextToken)) {
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context.report({
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node,
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loc: token.loc.start,
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message: REJECTED_SPACE_MESSAGE,
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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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} else if (token.value === ")" && shouldCloserHaveSpace(prevToken, token)) {
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// context.report(node, token.loc.start, MISSING_SPACE_MESSAGE);
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context.report({
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node,
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loc: token.loc.start,
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message: MISSING_SPACE_MESSAGE,
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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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} else if (token.value === ")" && shouldCloserRejectSpace(prevToken, token)) {
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context.report({
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node,
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loc: token.loc.start,
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message: REJECTED_SPACE_MESSAGE,
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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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};
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}
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};
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