432 lines
20 KiB
JavaScript
432 lines
20 KiB
JavaScript
/**
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* @fileoverview enforce a particular style for multiline comments
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* @author Teddy Katz
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*/
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"use strict";
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const astUtils = require("./utils/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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type: "suggestion",
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docs: {
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description: "enforce a particular style for multiline comments",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/multiline-comment-style"
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},
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fixable: "whitespace",
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schema: [{ enum: ["starred-block", "separate-lines", "bare-block"] }],
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messages: {
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expectedBlock: "Expected a block comment instead of consecutive line comments.",
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expectedBareBlock: "Expected a block comment without padding stars.",
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startNewline: "Expected a linebreak after '/*'.",
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endNewline: "Expected a linebreak before '*/'.",
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missingStar: "Expected a '*' at the start of this line.",
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alignment: "Expected this line to be aligned with the start of the comment.",
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expectedLines: "Expected multiple line comments instead of a block 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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const option = context.options[0] || "starred-block";
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//----------------------------------------------------------------------
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// Helpers
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//----------------------------------------------------------------------
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/**
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* Checks if a comment line is starred.
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* @param {string} line A string representing a comment line.
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* @returns {boolean} Whether or not the comment line is starred.
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*/
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function isStarredCommentLine(line) {
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return /^\s*\*/u.test(line);
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}
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/**
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* Checks if a comment group is in starred-block form.
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* @param {Token[]} commentGroup A group of comments, containing either multiple line comments or a single block comment.
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* @returns {boolean} Whether or not the comment group is in starred block form.
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*/
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function isStarredBlockComment([firstComment]) {
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if (firstComment.type !== "Block") {
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return false;
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}
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const lines = firstComment.value.split(astUtils.LINEBREAK_MATCHER);
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// The first and last lines can only contain whitespace.
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return lines.length > 0 && lines.every((line, i) => (i === 0 || i === lines.length - 1 ? /^\s*$/u : /^\s*\*/u).test(line));
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}
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/**
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* Checks if a comment group is in JSDoc form.
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* @param {Token[]} commentGroup A group of comments, containing either multiple line comments or a single block comment.
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* @returns {boolean} Whether or not the comment group is in JSDoc form.
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*/
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function isJSDocComment([firstComment]) {
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if (firstComment.type !== "Block") {
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return false;
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}
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const lines = firstComment.value.split(astUtils.LINEBREAK_MATCHER);
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return /^\*\s*$/u.test(lines[0]) &&
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lines.slice(1, -1).every(line => /^\s* /u.test(line)) &&
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/^\s*$/u.test(lines[lines.length - 1]);
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}
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/**
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* Processes a comment group that is currently in separate-line form, calculating the offset for each line.
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* @param {Token[]} commentGroup A group of comments containing multiple line comments.
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* @returns {string[]} An array of the processed lines.
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*/
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function processSeparateLineComments(commentGroup) {
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const allLinesHaveLeadingSpace = commentGroup
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.map(({ value }) => value)
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.filter(line => line.trim().length)
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.every(line => line.startsWith(" "));
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return commentGroup.map(({ value }) => (allLinesHaveLeadingSpace ? value.replace(/^ /u, "") : value));
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}
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/**
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* Processes a comment group that is currently in starred-block form, calculating the offset for each line.
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* @param {Token} comment A single block comment token in starred-block form.
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* @returns {string[]} An array of the processed lines.
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*/
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function processStarredBlockComment(comment) {
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const lines = comment.value.split(astUtils.LINEBREAK_MATCHER)
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.filter((line, i, linesArr) => !(i === 0 || i === linesArr.length - 1))
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.map(line => line.replace(/^\s*$/u, ""));
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const allLinesHaveLeadingSpace = lines
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.map(line => line.replace(/\s*\*/u, ""))
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.filter(line => line.trim().length)
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.every(line => line.startsWith(" "));
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return lines.map(line => line.replace(allLinesHaveLeadingSpace ? /\s*\* ?/u : /\s*\*/u, ""));
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}
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/**
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* Processes a comment group that is currently in bare-block form, calculating the offset for each line.
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* @param {Token} comment A single block comment token in bare-block form.
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* @returns {string[]} An array of the processed lines.
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*/
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function processBareBlockComment(comment) {
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const lines = comment.value.split(astUtils.LINEBREAK_MATCHER).map(line => line.replace(/^\s*$/u, ""));
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const leadingWhitespace = `${sourceCode.text.slice(comment.range[0] - comment.loc.start.column, comment.range[0])} `;
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let offset = "";
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/*
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* Calculate the offset of the least indented line and use that as the basis for offsetting all the lines.
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* The first line should not be checked because it is inline with the opening block comment delimiter.
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*/
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for (const [i, line] of lines.entries()) {
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if (!line.trim().length || i === 0) {
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continue;
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}
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const [, lineOffset] = line.match(/^(\s*\*?\s*)/u);
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if (lineOffset.length < leadingWhitespace.length) {
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const newOffset = leadingWhitespace.slice(lineOffset.length - leadingWhitespace.length);
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if (newOffset.length > offset.length) {
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offset = newOffset;
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}
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}
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}
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return lines.map(line => {
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const match = line.match(/^(\s*\*?\s*)(.*)/u);
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const [, lineOffset, lineContents] = match;
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if (lineOffset.length > leadingWhitespace.length) {
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return `${lineOffset.slice(leadingWhitespace.length - (offset.length + lineOffset.length))}${lineContents}`;
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}
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if (lineOffset.length < leadingWhitespace.length) {
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return `${lineOffset.slice(leadingWhitespace.length)}${lineContents}`;
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}
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return lineContents;
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});
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}
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/**
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* Gets a list of comment lines in a group, formatting leading whitespace as necessary.
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* @param {Token[]} commentGroup A group of comments containing either multiple line comments or a single block comment.
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* @returns {string[]} A list of comment lines.
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*/
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function getCommentLines(commentGroup) {
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const [firstComment] = commentGroup;
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if (firstComment.type === "Line") {
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return processSeparateLineComments(commentGroup);
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}
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if (isStarredBlockComment(commentGroup)) {
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return processStarredBlockComment(firstComment);
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}
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return processBareBlockComment(firstComment);
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}
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/**
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* Gets the initial offset (whitespace) from the beginning of a line to a given comment token.
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* @param {Token} comment The token to check.
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* @returns {string} The offset from the beginning of a line to the token.
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*/
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function getInitialOffset(comment) {
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return sourceCode.text.slice(comment.range[0] - comment.loc.start.column, comment.range[0]);
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}
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/**
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* Converts a comment into starred-block form
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* @param {Token} firstComment The first comment of the group being converted
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* @param {string[]} commentLinesList A list of lines to appear in the new starred-block comment
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* @returns {string} A representation of the comment value in starred-block form, excluding start and end markers
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*/
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function convertToStarredBlock(firstComment, commentLinesList) {
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const initialOffset = getInitialOffset(firstComment);
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return `/*\n${commentLinesList.map(line => `${initialOffset} * ${line}`).join("\n")}\n${initialOffset} */`;
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}
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/**
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* Converts a comment into separate-line form
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* @param {Token} firstComment The first comment of the group being converted
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* @param {string[]} commentLinesList A list of lines to appear in the new starred-block comment
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* @returns {string} A representation of the comment value in separate-line form
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*/
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function convertToSeparateLines(firstComment, commentLinesList) {
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return commentLinesList.map(line => `// ${line}`).join(`\n${getInitialOffset(firstComment)}`);
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}
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/**
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* Converts a comment into bare-block form
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* @param {Token} firstComment The first comment of the group being converted
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* @param {string[]} commentLinesList A list of lines to appear in the new starred-block comment
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* @returns {string} A representation of the comment value in bare-block form
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*/
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function convertToBlock(firstComment, commentLinesList) {
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return `/* ${commentLinesList.join(`\n${getInitialOffset(firstComment)} `)} */`;
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}
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/**
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* Each method checks a group of comments to see if it's valid according to the given option.
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* @param {Token[]} commentGroup A list of comments that appear together. This will either contain a single
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* block comment or multiple line comments.
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* @returns {void}
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*/
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const commentGroupCheckers = {
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"starred-block"(commentGroup) {
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const [firstComment] = commentGroup;
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const commentLines = getCommentLines(commentGroup);
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if (commentLines.some(value => value.includes("*/"))) {
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return;
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}
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if (commentGroup.length > 1) {
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context.report({
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loc: {
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start: firstComment.loc.start,
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end: commentGroup[commentGroup.length - 1].loc.end
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},
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messageId: "expectedBlock",
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fix(fixer) {
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const range = [firstComment.range[0], commentGroup[commentGroup.length - 1].range[1]];
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return commentLines.some(value => value.startsWith("/"))
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? null
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: fixer.replaceTextRange(range, convertToStarredBlock(firstComment, commentLines));
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}
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});
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} else {
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const lines = firstComment.value.split(astUtils.LINEBREAK_MATCHER);
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const expectedLeadingWhitespace = getInitialOffset(firstComment);
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const expectedLinePrefix = `${expectedLeadingWhitespace} *`;
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if (!/^\*?\s*$/u.test(lines[0])) {
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const start = firstComment.value.startsWith("*") ? firstComment.range[0] + 1 : firstComment.range[0];
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context.report({
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loc: {
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start: firstComment.loc.start,
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end: { line: firstComment.loc.start.line, column: firstComment.loc.start.column + 2 }
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},
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messageId: "startNewline",
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fix: fixer => fixer.insertTextAfterRange([start, start + 2], `\n${expectedLinePrefix}`)
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});
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}
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if (!/^\s*$/u.test(lines[lines.length - 1])) {
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context.report({
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loc: {
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start: { line: firstComment.loc.end.line, column: firstComment.loc.end.column - 2 },
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end: firstComment.loc.end
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},
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messageId: "endNewline",
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fix: fixer => fixer.replaceTextRange([firstComment.range[1] - 2, firstComment.range[1]], `\n${expectedLinePrefix}/`)
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});
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}
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for (let lineNumber = firstComment.loc.start.line + 1; lineNumber <= firstComment.loc.end.line; lineNumber++) {
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const lineText = sourceCode.lines[lineNumber - 1];
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const errorType = isStarredCommentLine(lineText)
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? "alignment"
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: "missingStar";
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if (!lineText.startsWith(expectedLinePrefix)) {
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context.report({
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loc: {
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start: { line: lineNumber, column: 0 },
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end: { line: lineNumber, column: lineText.length }
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},
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messageId: errorType,
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fix(fixer) {
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const lineStartIndex = sourceCode.getIndexFromLoc({ line: lineNumber, column: 0 });
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if (errorType === "alignment") {
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const [, commentTextPrefix = ""] = lineText.match(/^(\s*\*)/u) || [];
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const commentTextStartIndex = lineStartIndex + commentTextPrefix.length;
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return fixer.replaceTextRange([lineStartIndex, commentTextStartIndex], expectedLinePrefix);
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}
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const [, commentTextPrefix = ""] = lineText.match(/^(\s*)/u) || [];
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const commentTextStartIndex = lineStartIndex + commentTextPrefix.length;
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let offset;
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for (const [idx, line] of lines.entries()) {
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if (!/\S+/u.test(line)) {
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continue;
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}
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const lineTextToAlignWith = sourceCode.lines[firstComment.loc.start.line - 1 + idx];
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const [, prefix = "", initialOffset = ""] = lineTextToAlignWith.match(/^(\s*(?:\/?\*)?(\s*))/u) || [];
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offset = `${commentTextPrefix.slice(prefix.length)}${initialOffset}`;
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break;
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}
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return fixer.replaceTextRange([lineStartIndex, commentTextStartIndex], `${expectedLinePrefix}${offset}`);
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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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"separate-lines"(commentGroup) {
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const [firstComment] = commentGroup;
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if (firstComment.type !== "Block" || isJSDocComment(commentGroup)) {
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return;
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}
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const commentLines = getCommentLines(commentGroup);
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const tokenAfter = sourceCode.getTokenAfter(firstComment, { includeComments: true });
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if (tokenAfter && firstComment.loc.end.line === tokenAfter.loc.start.line) {
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return;
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}
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context.report({
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loc: {
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start: firstComment.loc.start,
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end: { line: firstComment.loc.start.line, column: firstComment.loc.start.column + 2 }
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},
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messageId: "expectedLines",
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fix(fixer) {
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return fixer.replaceText(firstComment, convertToSeparateLines(firstComment, commentLines));
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}
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});
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},
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"bare-block"(commentGroup) {
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if (isJSDocComment(commentGroup)) {
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return;
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}
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const [firstComment] = commentGroup;
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const commentLines = getCommentLines(commentGroup);
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// Disallows consecutive line comments in favor of using a block comment.
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if (firstComment.type === "Line" && commentLines.length > 1 &&
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!commentLines.some(value => value.includes("*/"))) {
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context.report({
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loc: {
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start: firstComment.loc.start,
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end: commentGroup[commentGroup.length - 1].loc.end
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},
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messageId: "expectedBlock",
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fix(fixer) {
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return fixer.replaceTextRange(
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[firstComment.range[0], commentGroup[commentGroup.length - 1].range[1]],
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convertToBlock(firstComment, commentLines)
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);
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}
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});
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}
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// Prohibits block comments from having a * at the beginning of each line.
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if (isStarredBlockComment(commentGroup)) {
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context.report({
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loc: {
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start: firstComment.loc.start,
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end: { line: firstComment.loc.start.line, column: firstComment.loc.start.column + 2 }
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},
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messageId: "expectedBareBlock",
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fix(fixer) {
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return fixer.replaceText(firstComment, convertToBlock(firstComment, commentLines));
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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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return sourceCode.getAllComments()
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.filter(comment => comment.type !== "Shebang")
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.filter(comment => !astUtils.COMMENTS_IGNORE_PATTERN.test(comment.value))
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.filter(comment => {
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const tokenBefore = sourceCode.getTokenBefore(comment, { includeComments: true });
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return !tokenBefore || tokenBefore.loc.end.line < comment.loc.start.line;
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})
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.reduce((commentGroups, comment, index, commentList) => {
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const tokenBefore = sourceCode.getTokenBefore(comment, { includeComments: true });
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if (
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comment.type === "Line" &&
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index && commentList[index - 1].type === "Line" &&
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tokenBefore && tokenBefore.loc.end.line === comment.loc.start.line - 1 &&
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tokenBefore === commentList[index - 1]
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) {
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commentGroups[commentGroups.length - 1].push(comment);
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} else {
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commentGroups.push([comment]);
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}
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return commentGroups;
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}, [])
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.filter(commentGroup => !(commentGroup.length === 1 && commentGroup[0].loc.start.line === commentGroup[0].loc.end.line))
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.forEach(commentGroupCheckers[option]);
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}
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};
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}
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};
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