From 6c8e76d571a03594b7312f9807a87540c1aeff8b Mon Sep 17 00:00:00 2001
From: Ferdinand Beyer <fb@fbeyer.com>
Date: Mon, 16 Sep 2024 12:30:36 +0200
Subject: [PATCH] Evaluate vector and map attributes

---
 src/hiccup/compiler.clj    | 22 +++++++++++-----------
 test/hiccup2/core_test.clj | 11 ++++++++++-
 2 files changed, 21 insertions(+), 12 deletions(-)

diff --git a/src/hiccup/compiler.clj b/src/hiccup/compiler.clj
index e1db82f..4930ea4 100644
--- a/src/hiccup/compiler.clj
+++ b/src/hiccup/compiler.clj
@@ -166,7 +166,7 @@
        content])))
 
 (defn normalize-element
-  "Ensure an element vector is of the form [tag-name attrs content]." 
+  "Ensure an element vector is of the form [tag-name attrs content]."
   [tag-content]
   (normalize-element* tag-content merge-attributes))
 
@@ -217,13 +217,20 @@
       (and (seq? expr)
            (not= (first expr) `quote))))
 
+(defn- literal?
+  "True if x is a literal value that can be rendered as-is."
+  [x]
+  (and (not (unevaluated? x))
+       (or (not (or (vector? x) (map? x)))
+           (every? literal? x))))
+
 (defn compile-attr-map
   "Returns an unevaluated form that will render the supplied map as HTML
   attributes."
   [attrs]
-  (if (some unevaluated? (mapcat identity attrs))
-    `(render-attr-map ~attrs)
-    (render-attr-map attrs)))
+  (if (every? literal? (mapcat identity attrs))
+    (render-attr-map attrs)
+    `(render-attr-map ~attrs)))
 
 (defn- form-name
   "Get the name of the supplied form."
@@ -276,13 +283,6 @@
   (if-let [hint (-> x meta :tag)]
     (isa? (eval hint) type)))
 
-(defn- literal?
-  "True if x is a literal value that can be rendered as-is."
-  [x]
-  (and (not (unevaluated? x))
-       (or (not (or (vector? x) (map? x)))
-           (every? literal? x))))
-
 (defn- not-implicit-map?
   "True if we can infer that x is not a map."
   [x]
diff --git a/test/hiccup2/core_test.clj b/test/hiccup2/core_test.clj
index cb20141..6eb45f3 100644
--- a/test/hiccup2/core_test.clj
+++ b/test/hiccup2/core_test.clj
@@ -7,7 +7,7 @@
   (testing "html returns a RawString"
     (is (util/raw-string? (html [:div]))))
   (testing "converting to string"
-    (= (str (html [:div])) "<div></div>")))
+    (is (= (str (html [:div])) "<div></div>"))))
 
 (deftest tag-names
   (testing "basic tags"
@@ -115,6 +115,15 @@
            "<img src=\"/foo/bar\" />"))
     (is (= (str (html [:div {:id (str "a" "b")} (str "foo")]))
            "<div id=\"ab\">foo</div>")))
+  (testing "vector attributes are evaluated"
+    (let [x "bar"]
+      (is (= (str (html [:span {:class ["foo" x]}]))
+             "<span class=\"foo bar\"></span>"))))
+  (testing "map attributes are evaluated"
+    (let [color "red"
+          bg-color :blue]
+      (is (= (str (html [:span {:style {:background-color bg-color, :color color}} "foo"]))
+             "<span style=\"background-color:blue;color:red;\">foo</span>"))))
   (testing "type hints"
     (let [string "x"]
       (is (= (str (html [:span ^String string])) "<span>x</span>"))))