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383 lines
13 KiB
383 lines
13 KiB
3 years ago
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/**
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* @fileoverview Source code for spaced-comments rule
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* @author Gyandeep Singh
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*/
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"use strict";
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const escapeRegExp = require("escape-string-regexp");
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Escapes the control characters of a given string.
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* @param {string} s A string to escape.
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* @returns {string} An escaped string.
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*/
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function escape(s) {
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return `(?:${escapeRegExp(s)})`;
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}
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/**
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* Escapes the control characters of a given string.
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* And adds a repeat flag.
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* @param {string} s A string to escape.
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* @returns {string} An escaped string.
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*/
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function escapeAndRepeat(s) {
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return `${escape(s)}+`;
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}
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/**
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* Parses `markers` option.
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* If markers don't include `"*"`, this adds `"*"` to allow JSDoc comments.
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* @param {string[]} [markers] A marker list.
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* @returns {string[]} A marker list.
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*/
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function parseMarkersOption(markers) {
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// `*` is a marker for JSDoc comments.
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if (markers.indexOf("*") === -1) {
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return markers.concat("*");
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}
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return markers;
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}
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/**
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* Creates string pattern for exceptions.
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* Generated pattern:
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*
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* 1. A space or an exception pattern sequence.
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* @param {string[]} exceptions An exception pattern list.
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* @returns {string} A regular expression string for exceptions.
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*/
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function createExceptionsPattern(exceptions) {
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let pattern = "";
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/*
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* A space or an exception pattern sequence.
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* [] ==> "\s"
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* ["-"] ==> "(?:\s|\-+$)"
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* ["-", "="] ==> "(?:\s|(?:\-+|=+)$)"
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* ["-", "=", "--=="] ==> "(?:\s|(?:\-+|=+|(?:\-\-==)+)$)" ==> https://jex.im/regulex/#!embed=false&flags=&re=(%3F%3A%5Cs%7C(%3F%3A%5C-%2B%7C%3D%2B%7C(%3F%3A%5C-%5C-%3D%3D)%2B)%24)
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*/
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if (exceptions.length === 0) {
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// a space.
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pattern += "\\s";
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} else {
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// a space or...
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pattern += "(?:\\s|";
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if (exceptions.length === 1) {
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// a sequence of the exception pattern.
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pattern += escapeAndRepeat(exceptions[0]);
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} else {
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// a sequence of one of the exception patterns.
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pattern += "(?:";
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pattern += exceptions.map(escapeAndRepeat).join("|");
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pattern += ")";
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}
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pattern += `(?:$|[${Array.from(astUtils.LINEBREAKS).join("")}]))`;
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}
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return pattern;
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}
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/**
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* Creates RegExp object for `always` mode.
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* Generated pattern for beginning of comment:
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*
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* 1. First, a marker or nothing.
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* 2. Next, a space or an exception pattern sequence.
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* @param {string[]} markers A marker list.
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* @param {string[]} exceptions An exception pattern list.
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* @returns {RegExp} A RegExp object for the beginning of a comment in `always` mode.
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*/
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function createAlwaysStylePattern(markers, exceptions) {
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let pattern = "^";
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/*
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* A marker or nothing.
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* ["*"] ==> "\*?"
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* ["*", "!"] ==> "(?:\*|!)?"
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* ["*", "/", "!<"] ==> "(?:\*|\/|(?:!<))?" ==> https://jex.im/regulex/#!embed=false&flags=&re=(%3F%3A%5C*%7C%5C%2F%7C(%3F%3A!%3C))%3F
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*/
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if (markers.length === 1) {
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// the marker.
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pattern += escape(markers[0]);
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} else {
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// one of markers.
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pattern += "(?:";
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pattern += markers.map(escape).join("|");
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pattern += ")";
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}
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pattern += "?"; // or nothing.
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pattern += createExceptionsPattern(exceptions);
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return new RegExp(pattern, "u");
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}
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/**
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* Creates RegExp object for `never` mode.
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* Generated pattern for beginning of comment:
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*
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* 1. First, a marker or nothing (captured).
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* 2. Next, a space or a tab.
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* @param {string[]} markers A marker list.
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* @returns {RegExp} A RegExp object for `never` mode.
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*/
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function createNeverStylePattern(markers) {
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const pattern = `^(${markers.map(escape).join("|")})?[ \t]+`;
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return new RegExp(pattern, "u");
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}
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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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type: "suggestion",
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docs: {
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description: "enforce consistent spacing after the `//` or `/*` in a comment",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/spaced-comment"
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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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type: "string"
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}
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},
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markers: {
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type: "array",
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items: {
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type: "string"
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}
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},
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line: {
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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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type: "string"
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}
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},
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markers: {
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type: "array",
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items: {
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type: "string"
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}
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}
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},
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additionalProperties: false
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},
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block: {
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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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type: "string"
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}
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},
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markers: {
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type: "array",
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items: {
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type: "string"
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}
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},
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balanced: {
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type: "boolean",
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default: 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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additionalProperties: false
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}
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],
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messages: {
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unexpectedSpaceAfterMarker: "Unexpected space or tab after marker ({{refChar}}) in comment.",
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expectedExceptionAfter: "Expected exception block, space or tab after '{{refChar}}' in comment.",
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unexpectedSpaceBefore: "Unexpected space or tab before '*/' in comment.",
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unexpectedSpaceAfter: "Unexpected space or tab after '{{refChar}}' in comment.",
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expectedSpaceBefore: "Expected space or tab before '*/' in comment.",
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expectedSpaceAfter: "Expected space or tab after '{{refChar}}' in comment."
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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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// Unless the first option is never, require a space
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const requireSpace = context.options[0] !== "never";
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/*
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* Parse the second options.
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* If markers don't include `"*"`, it's added automatically for JSDoc
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* comments.
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*/
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const config = context.options[1] || {};
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const balanced = config.block && config.block.balanced;
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const styleRules = ["block", "line"].reduce((rule, type) => {
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const markers = parseMarkersOption(config[type] && config[type].markers || config.markers || []);
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const exceptions = config[type] && config[type].exceptions || config.exceptions || [];
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const endNeverPattern = "[ \t]+$";
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// Create RegExp object for valid patterns.
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rule[type] = {
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beginRegex: requireSpace ? createAlwaysStylePattern(markers, exceptions) : createNeverStylePattern(markers),
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endRegex: balanced && requireSpace ? new RegExp(`${createExceptionsPattern(exceptions)}$`, "u") : new RegExp(endNeverPattern, "u"),
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hasExceptions: exceptions.length > 0,
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captureMarker: new RegExp(`^(${markers.map(escape).join("|")})`, "u"),
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markers: new Set(markers)
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};
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return rule;
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}, {});
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/**
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* Reports a beginning spacing error with an appropriate message.
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* @param {ASTNode} node A comment node to check.
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* @param {string} messageId An error message to report.
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* @param {Array} match An array of match results for markers.
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* @param {string} refChar Character used for reference in the error message.
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* @returns {void}
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*/
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function reportBegin(node, messageId, match, refChar) {
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const type = node.type.toLowerCase(),
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commentIdentifier = type === "block" ? "/*" : "//";
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context.report({
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node,
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fix(fixer) {
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const start = node.range[0];
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let end = start + 2;
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if (requireSpace) {
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if (match) {
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end += match[0].length;
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}
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return fixer.insertTextAfterRange([start, end], " ");
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}
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end += match[0].length;
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return fixer.replaceTextRange([start, end], commentIdentifier + (match[1] ? match[1] : ""));
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},
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messageId,
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data: { refChar }
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});
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}
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/**
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* Reports an ending spacing error with an appropriate message.
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* @param {ASTNode} node A comment node to check.
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* @param {string} messageId An error message to report.
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* @param {string} match An array of the matched whitespace characters.
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* @returns {void}
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*/
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function reportEnd(node, messageId, match) {
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context.report({
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node,
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fix(fixer) {
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if (requireSpace) {
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return fixer.insertTextAfterRange([node.range[0], node.range[1] - 2], " ");
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}
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const end = node.range[1] - 2,
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start = end - match[0].length;
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return fixer.replaceTextRange([start, end], "");
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},
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messageId
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});
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}
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/**
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* Reports a given comment if it's invalid.
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* @param {ASTNode} node a comment node to check.
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* @returns {void}
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*/
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function checkCommentForSpace(node) {
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const type = node.type.toLowerCase(),
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rule = styleRules[type],
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commentIdentifier = type === "block" ? "/*" : "//";
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// Ignores empty comments and comments that consist only of a marker.
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if (node.value.length === 0 || rule.markers.has(node.value)) {
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return;
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}
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const beginMatch = rule.beginRegex.exec(node.value);
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const endMatch = rule.endRegex.exec(node.value);
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// Checks.
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if (requireSpace) {
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if (!beginMatch) {
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const hasMarker = rule.captureMarker.exec(node.value);
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const marker = hasMarker ? commentIdentifier + hasMarker[0] : commentIdentifier;
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if (rule.hasExceptions) {
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reportBegin(node, "expectedExceptionAfter", hasMarker, marker);
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} else {
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reportBegin(node, "expectedSpaceAfter", hasMarker, marker);
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}
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}
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if (balanced && type === "block" && !endMatch) {
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reportEnd(node, "expectedSpaceBefore");
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}
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} else {
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if (beginMatch) {
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if (!beginMatch[1]) {
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reportBegin(node, "unexpectedSpaceAfter", beginMatch, commentIdentifier);
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} else {
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reportBegin(node, "unexpectedSpaceAfterMarker", beginMatch, beginMatch[1]);
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}
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}
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if (balanced && type === "block" && endMatch) {
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reportEnd(node, "unexpectedSpaceBefore", endMatch);
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}
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}
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}
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return {
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Program() {
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const comments = sourceCode.getAllComments();
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comments.filter(token => token.type !== "Shebang").forEach(checkCommentForSpace);
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}
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};
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}
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};
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