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/**
* @fileoverview Rule to check empty newline between class members
* @author 薛定谔的猫<hh_2013@foxmail.com>
*/
"use strict";
const astUtils = require("../util/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "require or disallow an empty line between class members",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/lines-between-class-members"
},
fixable: "whitespace",
schema: [
{
enum: ["always", "never"]
},
{
type: "object",
properties: {
exceptAfterSingleLine: {
type: "boolean",
default: false
}
},
additionalProperties: false
}
],
messages: {
never: "Unexpected blank line between class members.",
always: "Expected blank line between class members."
}
},
create(context) {
const options = [];
options[0] = context.options[0] || "always";
options[1] = context.options[1] || { exceptAfterSingleLine: false };
const sourceCode = context.getSourceCode();
/**
* Checks if there is padding between two tokens
* @param {Token} first The first token
* @param {Token} second The second token
* @returns {boolean} True if there is at least a line between the tokens
*/
function isPaddingBetweenTokens(first, second) {
const comments = sourceCode.getCommentsBefore(second);
const len = comments.length;
// If there is no comments
if (len === 0) {
const linesBetweenFstAndSnd = second.loc.start.line - first.loc.end.line - 1;
return linesBetweenFstAndSnd >= 1;
}
// If there are comments
let sumOfCommentLines = 0; // the numbers of lines of comments
let prevCommentLineNum = -1; // line number of the end of the previous comment
for (let i = 0; i < len; i++) {
const commentLinesOfThisComment = comments[i].loc.end.line - comments[i].loc.start.line + 1;
sumOfCommentLines += commentLinesOfThisComment;
/*
* If this comment and the previous comment are in the same line,
* the count of comment lines is duplicated. So decrement sumOfCommentLines.
*/
if (prevCommentLineNum === comments[i].loc.start.line) {
sumOfCommentLines -= 1;
}
prevCommentLineNum = comments[i].loc.end.line;
}
/*
* If the first block and the first comment are in the same line,
* the count of comment lines is duplicated. So decrement sumOfCommentLines.
*/
if (first.loc.end.line === comments[0].loc.start.line) {
sumOfCommentLines -= 1;
}
/*
* If the last comment and the second block are in the same line,
* the count of comment lines is duplicated. So decrement sumOfCommentLines.
*/
if (comments[len - 1].loc.end.line === second.loc.start.line) {
sumOfCommentLines -= 1;
}
const linesBetweenFstAndSnd = second.loc.start.line - first.loc.end.line - 1;
return linesBetweenFstAndSnd - sumOfCommentLines >= 1;
}
return {
ClassBody(node) {
const body = node.body;
for (let i = 0; i < body.length - 1; i++) {
const curFirst = sourceCode.getFirstToken(body[i]);
const curLast = sourceCode.getLastToken(body[i]);
const nextFirst = sourceCode.getFirstToken(body[i + 1]);
const isPadded = isPaddingBetweenTokens(curLast, nextFirst);
const isMulti = !astUtils.isTokenOnSameLine(curFirst, curLast);
const skip = !isMulti && options[1].exceptAfterSingleLine;
if ((options[0] === "always" && !skip && !isPadded) ||
(options[0] === "never" && isPadded)) {
context.report({
node: body[i + 1],
messageId: isPadded ? "never" : "always",
fix(fixer) {
return isPadded
? fixer.replaceTextRange([curLast.range[1], nextFirst.range[0]], "\n")
: fixer.insertTextAfter(curLast, "\n");
}
});
}
}
}
};
}
};