--- /dev/null
+"use strict";
+
+const declarationValueIndex = require("../../utils/declarationValueIndex");
+const findFontFamily = require("../../utils/findFontFamily");
+const keywordSets = require("../../reference/keywordSets");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const validateOptions = require("../../utils/validateOptions");
+
+const ruleName = "font-family-no-missing-generic-family-keyword";
+
+const messages = ruleMessages(ruleName, {
+ rejected: "Unexpected missing generic font family"
+});
+
+const isFamilyNameKeyword = node =>
+ !node.quote && keywordSets.fontFamilyKeywords.has(node.value.toLowerCase());
+
+const rule = function(actual) {
+ return (root, result) => {
+ const validOptions = validateOptions(result, ruleName, { actual });
+ if (!validOptions) {
+ return;
+ }
+
+ root.walkDecls(/^font(-family)?$/i, decl => {
+ // Ignore @font-face
+ if (
+ decl.parent &&
+ decl.parent.type === "atrule" &&
+ decl.parent.name.toLowerCase() === "font-face"
+ ) {
+ return;
+ }
+
+ const fontFamilies = findFontFamily(decl.value);
+
+ if (fontFamilies.length === 0) {
+ return;
+ }
+
+ if (fontFamilies.some(isFamilyNameKeyword)) {
+ return;
+ }
+
+ report({
+ result,
+ ruleName,
+ message: messages.rejected,
+ node: decl,
+ index:
+ declarationValueIndex(decl) +
+ fontFamilies[fontFamilies.length - 1].sourceIndex
+ });
+ });
+ };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;