--- /dev/null
+"use strict";
+
+const _ = require("lodash");
+const atRuleParamIndex = require("../../utils/atRuleParamIndex");
+const declarationValueIndex = require("../../utils/declarationValueIndex");
+const getUnitFromValueNode = require("../../utils/getUnitFromValueNode");
+const optionsMatches = require("../../utils/optionsMatches");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const validateObjectWithStringArrayProps = require("../../utils/validateObjectWithStringArrayProps");
+const validateOptions = require("../../utils/validateOptions");
+const valueParser = require("postcss-value-parser");
+
+const ruleName = "unit-whitelist";
+
+const messages = ruleMessages(ruleName, {
+ rejected: unit => `Unexpected unit "${unit}"`
+});
+
+const rule = function(whitelistInput, options) {
+ const whitelist = [].concat(whitelistInput);
+ return (root, result) => {
+ const validOptions = validateOptions(
+ result,
+ ruleName,
+ {
+ actual: whitelist,
+ possible: [_.isString]
+ },
+ {
+ optional: true,
+ actual: options,
+ possible: {
+ ignoreProperties: validateObjectWithStringArrayProps
+ }
+ }
+ );
+ if (!validOptions) {
+ return;
+ }
+
+ function check(node, value, getIndex) {
+ // make sure multiplication operations (*) are divided - not handled
+ // by postcss-value-parser
+ value = value.replace(/\*/g, ",");
+ valueParser(value).walk(function(valueNode) {
+ // Ignore wrong units within `url` function
+ if (
+ valueNode.type === "function" &&
+ valueNode.value.toLowerCase() === "url"
+ ) {
+ return false;
+ }
+
+ const unit = getUnitFromValueNode(valueNode);
+
+ if (!unit || (unit && whitelist.indexOf(unit.toLowerCase()) !== -1)) {
+ return;
+ }
+
+ if (
+ options &&
+ optionsMatches(
+ options["ignoreProperties"],
+ unit.toLowerCase(),
+ node.prop
+ )
+ ) {
+ return;
+ }
+
+ report({
+ index: getIndex(node) + valueNode.sourceIndex,
+ message: messages.rejected(unit),
+ node,
+ result,
+ ruleName
+ });
+ });
+ }
+
+ root.walkAtRules(/^media$/i, atRule =>
+ check(atRule, atRule.params, atRuleParamIndex)
+ );
+ root.walkDecls(decl => check(decl, decl.value, declarationValueIndex));
+ };
+};
+
+rule.primaryOptionArray = true;
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;