--- /dev/null
+"use strict";
+
+const isWhitespace = require("../../utils/isWhitespace");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const styleSearch = require("style-search");
+const validateOptions = require("../../utils/validateOptions");
+
+const ruleName = "function-whitespace-after";
+
+const messages = ruleMessages(ruleName, {
+ expected: 'Expected whitespace after ")"',
+ rejected: 'Unexpected whitespace after ")"'
+});
+
+const ACCEPTABLE_AFTER_CLOSING_PAREN = new Set([")", ",", "}", ":", undefined]);
+
+const rule = function(expectation) {
+ return (root, result) => {
+ const validOptions = validateOptions(result, ruleName, {
+ actual: expectation,
+ possible: ["always", "never"]
+ });
+ if (!validOptions) {
+ return;
+ }
+
+ root.walkDecls(decl => {
+ const declString = decl.toString();
+
+ styleSearch(
+ {
+ source: declString,
+ target: ")",
+ functionArguments: "only"
+ },
+ match => {
+ checkClosingParen(declString, match.startIndex, decl);
+ }
+ );
+ });
+
+ function checkClosingParen(source, index, node) {
+ const nextChar = source[index + 1];
+ if (expectation === "always") {
+ // Allow for the next character to be a single empty space,
+ // another closing parenthesis, a comma, or the end of the value
+ if (nextChar === " ") {
+ return;
+ }
+ if (nextChar === "\n") {
+ return;
+ }
+ if (source.substr(index + 1, 2) === "\r\n") {
+ return;
+ }
+ if (ACCEPTABLE_AFTER_CLOSING_PAREN.has(nextChar)) {
+ return;
+ }
+ report({
+ message: messages.expected,
+ node,
+ index: index + 1,
+ result,
+ ruleName
+ });
+ } else if (expectation === "never") {
+ if (isWhitespace(nextChar)) {
+ report({
+ message: messages.rejected,
+ node,
+ index: index + 1,
+ result,
+ ruleName
+ });
+ }
+ }
+ }
+ };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;