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- "use strict";
- const astUtils = require("./utils/ast-utils");
- 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();
-
- function findLastConsecutiveTokenAfter(prevLastToken, nextFirstToken, maxLine) {
- const after = sourceCode.getTokenAfter(prevLastToken, { includeComments: true });
- if (after !== nextFirstToken && after.loc.start.line - prevLastToken.loc.end.line <= maxLine) {
- return findLastConsecutiveTokenAfter(after, nextFirstToken, maxLine);
- }
- return prevLastToken;
- }
-
- function findFirstConsecutiveTokenBefore(nextFirstToken, prevLastToken, maxLine) {
- const before = sourceCode.getTokenBefore(nextFirstToken, { includeComments: true });
- if (before !== prevLastToken && nextFirstToken.loc.start.line - before.loc.end.line <= maxLine) {
- return findFirstConsecutiveTokenBefore(before, prevLastToken, maxLine);
- }
- return nextFirstToken;
- }
-
- function hasTokenOrCommentBetween(before, after) {
- return sourceCode.getTokensBetween(before, after, { includeComments: true }).length !== 0;
- }
- 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 isMulti = !astUtils.isTokenOnSameLine(curFirst, curLast);
- const skip = !isMulti && options[1].exceptAfterSingleLine;
- const beforePadding = findLastConsecutiveTokenAfter(curLast, nextFirst, 1);
- const afterPadding = findFirstConsecutiveTokenBefore(nextFirst, curLast, 1);
- const isPadded = afterPadding.loc.start.line - beforePadding.loc.end.line > 1;
- const hasTokenInPadding = hasTokenOrCommentBetween(beforePadding, afterPadding);
- const curLineLastToken = findLastConsecutiveTokenAfter(curLast, nextFirst, 0);
- if ((options[0] === "always" && !skip && !isPadded) ||
- (options[0] === "never" && isPadded)) {
- context.report({
- node: body[i + 1],
- messageId: isPadded ? "never" : "always",
- fix(fixer) {
- if (hasTokenInPadding) {
- return null;
- }
- return isPadded
- ? fixer.replaceTextRange([beforePadding.range[1], afterPadding.range[0]], "\n")
- : fixer.insertTextAfter(curLineLastToken, "\n");
- }
- });
- }
- }
- }
- };
- }
- };
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