304 lines
10 KiB
JavaScript
304 lines
10 KiB
JavaScript
/**
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* @fileoverview enforce or disallow capitalization of the first letter of a comment
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* @author Kevin Partington
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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 LETTER_PATTERN = require("../util/patterns/letters");
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const astUtils = require("../ast-utils");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const ALWAYS_MESSAGE = "Comments should not begin with a lowercase character",
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NEVER_MESSAGE = "Comments should not begin with an uppercase character",
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DEFAULT_IGNORE_PATTERN = astUtils.COMMENTS_IGNORE_PATTERN,
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WHITESPACE = /\s/g,
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MAYBE_URL = /^\s*[^:/?#\s]+:\/\/[^?#]/, // TODO: Combine w/ max-len pattern?
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DEFAULTS = {
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ignorePattern: null,
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ignoreInlineComments: false,
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ignoreConsecutiveComments: false
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};
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/*
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* Base schema body for defining the basic capitalization rule, ignorePattern,
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* and ignoreInlineComments values.
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* This can be used in a few different ways in the actual schema.
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*/
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const SCHEMA_BODY = {
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type: "object",
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properties: {
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ignorePattern: {
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type: "string"
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},
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ignoreInlineComments: {
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type: "boolean"
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},
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ignoreConsecutiveComments: {
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type: "boolean"
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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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* Get normalized options for either block or line comments from the given
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* user-provided options.
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* - If the user-provided options is just a string, returns a normalized
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* set of options using default values for all other options.
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* - If the user-provided options is an object, then a normalized option
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* set is returned. Options specified in overrides will take priority
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* over options specified in the main options object, which will in
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* turn take priority over the rule's defaults.
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*
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* @param {Object|string} rawOptions The user-provided options.
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* @param {string} which Either "line" or "block".
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* @returns {Object} The normalized options.
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*/
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function getNormalizedOptions(rawOptions, which) {
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if (!rawOptions) {
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return Object.assign({}, DEFAULTS);
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}
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return Object.assign({}, DEFAULTS, rawOptions[which] || rawOptions);
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}
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/**
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* Get normalized options for block and line comments.
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*
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* @param {Object|string} rawOptions The user-provided options.
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* @returns {Object} An object with "Line" and "Block" keys and corresponding
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* normalized options objects.
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*/
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function getAllNormalizedOptions(rawOptions) {
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return {
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Line: getNormalizedOptions(rawOptions, "line"),
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Block: getNormalizedOptions(rawOptions, "block")
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};
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}
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/**
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* Creates a regular expression for each ignorePattern defined in the rule
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* options.
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*
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* This is done in order to avoid invoking the RegExp constructor repeatedly.
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*
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* @param {Object} normalizedOptions The normalized rule options.
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* @returns {void}
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*/
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function createRegExpForIgnorePatterns(normalizedOptions) {
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Object.keys(normalizedOptions).forEach(key => {
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const ignorePatternStr = normalizedOptions[key].ignorePattern;
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if (ignorePatternStr) {
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const regExp = RegExp(`^\\s*(?:${ignorePatternStr})`);
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normalizedOptions[key].ignorePatternRegExp = regExp;
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}
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});
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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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docs: {
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description: "enforce or disallow capitalization of the first letter of a comment",
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category: "Stylistic Issues",
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recommended: false
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},
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fixable: "code",
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schema: [
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{ enum: ["always", "never"] },
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{
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oneOf: [
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SCHEMA_BODY,
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{
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type: "object",
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properties: {
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line: SCHEMA_BODY,
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block: SCHEMA_BODY
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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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]
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},
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create(context) {
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const capitalize = context.options[0] || "always",
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normalizedOptions = getAllNormalizedOptions(context.options[1]),
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sourceCode = context.getSourceCode();
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createRegExpForIgnorePatterns(normalizedOptions);
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//----------------------------------------------------------------------
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// Helpers
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//----------------------------------------------------------------------
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/**
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* Checks whether a comment is an inline comment.
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*
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* For the purpose of this rule, a comment is inline if:
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* 1. The comment is preceded by a token on the same line; and
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* 2. The command is followed by a token on the same line.
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*
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* Note that the comment itself need not be single-line!
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*
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* Also, it follows from this definition that only block comments can
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* be considered as possibly inline. This is because line comments
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* would consume any following tokens on the same line as the comment.
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*
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* @param {ASTNode} comment The comment node to check.
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* @returns {boolean} True if the comment is an inline comment, false
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* otherwise.
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*/
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function isInlineComment(comment) {
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const previousToken = sourceCode.getTokenBefore(comment, { includeComments: true }),
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nextToken = sourceCode.getTokenAfter(comment, { includeComments: true });
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return Boolean(
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previousToken &&
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nextToken &&
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comment.loc.start.line === previousToken.loc.end.line &&
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comment.loc.end.line === nextToken.loc.start.line
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);
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}
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/**
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* Determine if a comment follows another comment.
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*
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* @param {ASTNode} comment The comment to check.
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* @returns {boolean} True if the comment follows a valid comment.
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*/
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function isConsecutiveComment(comment) {
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const previousTokenOrComment = sourceCode.getTokenBefore(comment, { includeComments: true });
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return Boolean(
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previousTokenOrComment &&
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["Block", "Line"].indexOf(previousTokenOrComment.type) !== -1
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);
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}
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/**
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* Check a comment to determine if it is valid for this rule.
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*
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* @param {ASTNode} comment The comment node to process.
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* @param {Object} options The options for checking this comment.
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* @returns {boolean} True if the comment is valid, false otherwise.
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*/
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function isCommentValid(comment, options) {
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// 1. Check for default ignore pattern.
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if (DEFAULT_IGNORE_PATTERN.test(comment.value)) {
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return true;
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}
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// 2. Check for custom ignore pattern.
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const commentWithoutAsterisks = comment.value
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.replace(/\*/g, "");
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if (options.ignorePatternRegExp && options.ignorePatternRegExp.test(commentWithoutAsterisks)) {
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return true;
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}
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// 3. Check for inline comments.
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if (options.ignoreInlineComments && isInlineComment(comment)) {
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return true;
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}
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// 4. Is this a consecutive comment (and are we tolerating those)?
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if (options.ignoreConsecutiveComments && isConsecutiveComment(comment)) {
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return true;
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}
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// 5. Does the comment start with a possible URL?
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if (MAYBE_URL.test(commentWithoutAsterisks)) {
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return true;
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}
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// 6. Is the initial word character a letter?
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const commentWordCharsOnly = commentWithoutAsterisks
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.replace(WHITESPACE, "");
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if (commentWordCharsOnly.length === 0) {
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return true;
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}
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const firstWordChar = commentWordCharsOnly[0];
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if (!LETTER_PATTERN.test(firstWordChar)) {
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return true;
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}
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// 7. Check the case of the initial word character.
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const isUppercase = firstWordChar !== firstWordChar.toLocaleLowerCase(),
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isLowercase = firstWordChar !== firstWordChar.toLocaleUpperCase();
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if (capitalize === "always" && isLowercase) {
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return false;
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}
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if (capitalize === "never" && isUppercase) {
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return false;
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}
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return true;
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}
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/**
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* Process a comment to determine if it needs to be reported.
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*
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* @param {ASTNode} comment The comment node to process.
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* @returns {void}
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*/
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function processComment(comment) {
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const options = normalizedOptions[comment.type],
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commentValid = isCommentValid(comment, options);
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if (!commentValid) {
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const message = capitalize === "always"
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? ALWAYS_MESSAGE
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: NEVER_MESSAGE;
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context.report({
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node: null, // Intentionally using loc instead
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loc: comment.loc,
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message,
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fix(fixer) {
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const match = comment.value.match(LETTER_PATTERN);
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return fixer.replaceTextRange(
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// Offset match.index by 2 to account for the first 2 characters that start the comment (// or /*)
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[comment.range[0] + match.index + 2, comment.range[0] + match.index + 3],
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capitalize === "always" ? match[0].toLocaleUpperCase() : match[0].toLocaleLowerCase()
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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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// Public
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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(processComment);
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}
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};
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}
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};
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