--- /dev/null
+"use strict";
+
+const _ = require("lodash");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const styleSearch = require("style-search");
+const validateOptions = require("../../utils/validateOptions");
+
+const ruleName = "selector-max-empty-lines";
+
+const messages = ruleMessages(ruleName, {
+ expected: max =>
+ `Expected no more than ${max} empty ${max === 1 ? "line" : "lines"}`
+});
+
+const rule = function(max) {
+ const maxAdjacentNewlines = max + 1;
+
+ return (root, result) => {
+ const validOptions = validateOptions(result, ruleName, {
+ actual: max,
+ possible: _.isNumber
+ });
+ if (!validOptions) {
+ return;
+ }
+
+ root.walkRules(rule => {
+ const selector = rule.raws.selector
+ ? rule.raws.selector.raw
+ : rule.selector;
+ const repeatLFNewLines = _.repeat("\n", maxAdjacentNewlines);
+ const repeatCRLFNewLines = _.repeat("\r\n", maxAdjacentNewlines);
+
+ styleSearch({ source: selector, target: "\n" }, match => {
+ if (
+ selector.substr(match.startIndex + 1, maxAdjacentNewlines) ===
+ repeatLFNewLines ||
+ selector.substr(match.startIndex + 1, maxAdjacentNewlines * 2) ===
+ repeatCRLFNewLines
+ ) {
+ // Put index at `\r` if it's CRLF, otherwise leave it at `\n`
+ let index = match.startIndex;
+ if (selector[index - 1] === "\r") {
+ index -= 1;
+ }
+
+ report({
+ message: messages.expected(max),
+ node: rule,
+ index,
+ result,
+ ruleName
+ });
+ }
+ });
+ });
+ };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;