--- /dev/null
+"use strict";
+
+const blockString = require("../../utils/blockString");
+const hasBlock = require("../../utils/hasBlock");
+const hasEmptyBlock = require("../../utils/hasEmptyBlock");
+const hasEmptyLine = require("../../utils/hasEmptyLine");
+const isSingleLineString = require("../../utils/isSingleLineString");
+const optionsMatches = require("../../utils/optionsMatches");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const validateOptions = require("../../utils/validateOptions");
+
+const ruleName = "block-closing-brace-empty-line-before";
+
+const messages = ruleMessages(ruleName, {
+ expected: "Expected empty line before closing brace",
+ rejected: "Unexpected empty line before closing brace"
+});
+
+const rule = function(expectation, options) {
+ return (root, result) => {
+ const validOptions = validateOptions(
+ result,
+ ruleName,
+ {
+ actual: expectation,
+ possible: ["always-multi-line", "never"]
+ },
+ {
+ actual: options,
+ possible: {
+ except: ["after-closing-brace"]
+ },
+ optional: true
+ }
+ );
+ if (!validOptions) {
+ return;
+ }
+
+ // Check both kinds of statements: rules and at-rules
+ root.walkRules(check);
+ root.walkAtRules(check);
+
+ function check(statement) {
+ // Return early if blockless or has empty block
+ if (!hasBlock(statement) || hasEmptyBlock(statement)) {
+ return;
+ }
+
+ // Get whitespace after ""}", ignoring extra semicolon
+ const before = (statement.raws.after || "").replace(/;+/, "");
+ if (before === undefined) {
+ return;
+ }
+
+ // Calculate index
+ const statementString = statement.toString();
+ let index = statementString.length - 1;
+ if (statementString[index - 1] === "\r") {
+ index -= 1;
+ }
+
+ // Set expectation
+ const expectEmptyLineBefore = (() => {
+ const childNodeTypes = statement.nodes.map(item => item.type);
+
+ // Reverse the primary options if `after-closing-brace` is set
+ if (
+ optionsMatches(options, "except", "after-closing-brace") &&
+ (statement.type === "atrule" && childNodeTypes.indexOf("decl") === -1)
+ ) {
+ return expectation === "never" ? true : false;
+ }
+
+ return expectation === "always-multi-line" &&
+ !isSingleLineString(blockString(statement))
+ ? true
+ : false;
+ })();
+
+ // Check for at least one empty line
+ const hasEmptyLineBefore = hasEmptyLine(before);
+
+ // Return if the expectation is met
+ if (expectEmptyLineBefore === hasEmptyLineBefore) {
+ return;
+ }
+
+ const message = expectEmptyLineBefore
+ ? messages.expected
+ : messages.rejected;
+
+ report({
+ message,
+ result,
+ ruleName,
+ node: statement,
+ index
+ });
+ }
+ };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;