--- /dev/null
+"use strict";
+
+const _ = require("lodash");
+const beforeBlockString = require("../../utils/beforeBlockString");
+const blockString = require("../../utils/blockString");
+const hasBlock = require("../../utils/hasBlock");
+const hasEmptyBlock = require("../../utils/hasEmptyBlock");
+const optionsMatches = require("../../utils/optionsMatches");
+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-space-before";
+
+const messages = ruleMessages(ruleName, {
+ expectedBefore: () => 'Expected single space before "{"',
+ rejectedBefore: () => 'Unexpected whitespace before "{"',
+ expectedBeforeSingleLine: () =>
+ 'Expected single space before "{" of a single-line block',
+ rejectedBeforeSingleLine: () =>
+ 'Unexpected whitespace before "{" of a single-line block',
+ expectedBeforeMultiLine: () =>
+ 'Expected single space before "{" of a multi-line block',
+ rejectedBeforeMultiLine: () =>
+ 'Unexpected whitespace before "{" of a multi-line block'
+});
+
+const rule = function(expectation, options) {
+ const checker = whitespaceChecker("space", expectation, messages);
+ return (root, result) => {
+ const validOptions = validateOptions(
+ result,
+ ruleName,
+ {
+ actual: expectation,
+ possible: [
+ "always",
+ "never",
+ "always-single-line",
+ "never-single-line",
+ "always-multi-line",
+ "never-multi-line"
+ ]
+ },
+ {
+ actual: options,
+ possible: {
+ ignoreAtRules: [_.isString]
+ },
+ 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 an empty block
+ if (!hasBlock(statement) || hasEmptyBlock(statement)) {
+ return;
+ }
+
+ // Return early if at-rule is to be ignored
+ if (optionsMatches(options, "ignoreAtRules", statement.name)) {
+ return;
+ }
+
+ const source = beforeBlockString(statement);
+ const beforeBraceNoRaw = beforeBlockString(statement, {
+ noRawBefore: true
+ });
+
+ let index = beforeBraceNoRaw.length - 1;
+ if (beforeBraceNoRaw[index - 1] === "\r") {
+ index -= 1;
+ }
+
+ checker.before({
+ source,
+ index: source.length,
+ lineCheckStr: blockString(statement),
+ err: m => {
+ report({
+ message: m,
+ node: statement,
+ index,
+ result,
+ ruleName
+ });
+ }
+ });
+ }
+ };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;