--- /dev/null
+"use strict";
+
+const _ = require("lodash");
+const declarationValueIndex = require("../../utils/declarationValueIndex");
+const isStandardSyntaxFunction = require("../../utils/isStandardSyntaxFunction");
+const matchesStringOrRegExp = require("../../utils/matchesStringOrRegExp");
+const postcss = require("postcss");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const validateOptions = require("../../utils/validateOptions");
+const valueParser = require("postcss-value-parser");
+
+const ruleName = "function-whitelist";
+
+const messages = ruleMessages(ruleName, {
+ rejected: name => `Unexpected function "${name}"`
+});
+
+const rule = function(whitelistInput) {
+ const whitelist = [].concat(whitelistInput);
+ return (root, result) => {
+ const validOptions = validateOptions(result, ruleName, {
+ actual: whitelist,
+ possible: [_.isString]
+ });
+ if (!validOptions) {
+ return;
+ }
+ root.walkDecls(decl => {
+ const value = decl.value;
+
+ valueParser(value).walk(function(node) {
+ if (node.type !== "function") {
+ return;
+ }
+ if (!isStandardSyntaxFunction(node)) {
+ return;
+ }
+ if (
+ matchesStringOrRegExp(
+ postcss.vendor.unprefixed(node.value),
+ whitelist
+ )
+ ) {
+ return;
+ }
+ report({
+ message: messages.rejected(node.value),
+ node: decl,
+ index: declarationValueIndex(decl) + node.sourceIndex,
+ result,
+ ruleName
+ });
+ });
+ });
+ };
+};
+
+rule.primaryOptionArray = true;
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;