--- /dev/null
+"use strict";
+
+const beforeBlockString = require("../../utils/beforeBlockString");
+const blockString = require("../../utils/blockString");
+const hasBlock = require("../../utils/hasBlock");
+const hasEmptyBlock = require("../../utils/hasEmptyBlock");
+const nextNonCommentNode = require("../../utils/nextNonCommentNode");
+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 = "block-opening-brace-newline-after";
+
+const messages = ruleMessages(ruleName, {
+ expectedAfter: () => 'Expected newline after "{"',
+ expectedAfterMultiLine: () =>
+ 'Expected newline after "{" of a multi-line block',
+ rejectedAfterMultiLine: () =>
+ 'Unexpected whitespace after "{" of a multi-line block'
+});
+
+const rule = function(expectation) {
+ const checker = whitespaceChecker("newline", expectation, messages);
+
+ return (root, result) => {
+ const validOptions = validateOptions(result, ruleName, {
+ actual: expectation,
+ possible: ["always", "always-multi-line", "never-multi-line"]
+ });
+ if (!validOptions) {
+ return;
+ }
+
+ // Check both kinds of statement: rules and at-rules
+ root.walkRules(check);
+ root.walkAtRules(check);
+
+ function check(statement) {
+ // Return early if blockless or has an empty block
+ if (!hasBlock(statement) || hasEmptyBlock(statement)) {
+ return;
+ }
+
+ // Allow an end-of-line comment
+ const nodeToCheck = nextNonCommentNode(statement.first);
+ if (!nodeToCheck) {
+ return;
+ }
+
+ checker.afterOneOnly({
+ source: rawNodeString(nodeToCheck),
+ index: -1,
+ lineCheckStr: blockString(statement),
+ err: m => {
+ report({
+ message: m,
+ node: statement,
+ index:
+ beforeBlockString(statement, { noRawBefore: true }).length + 1,
+ result,
+ ruleName
+ });
+ }
+ });
+ }
+ };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;