--- /dev/null
+"use strict";
+
+const hasBlock = require("../../utils/hasBlock");
+const rawNodeString = require("../../utils/rawNodeString");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const validateOptions = require("../../utils/validateOptions");
+const whitespaceChecker = require("../../utils/whitespaceChecker");
+
+const ruleName = "at-rule-semicolon-space-before";
+
+const messages = ruleMessages(ruleName, {
+ expectedBefore: () => 'Expected single space before ";"',
+ rejectedBefore: () => 'Unexpected whitespace before ";"'
+});
+
+const rule = function(expectation) {
+ const checker = whitespaceChecker("space", expectation, messages);
+
+ return (root, result) => {
+ const validOptions = validateOptions(result, ruleName, {
+ actual: expectation,
+ possible: ["always", "never"]
+ });
+ if (!validOptions) {
+ return;
+ }
+
+ root.walkAtRules(atRule => {
+ if (hasBlock(atRule)) {
+ return;
+ }
+ const nodeString = rawNodeString(atRule);
+
+ checker.before({
+ source: nodeString,
+ index: nodeString.length,
+ err: m => {
+ report({
+ message: m,
+ node: atRule,
+ index: nodeString.length - 1,
+ result,
+ ruleName
+ });
+ }
+ });
+ });
+ };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;