Remove invalid /> when content is added to an element

#215

src/rewritable_units/element.rs

@@ -370,6 +370,7 @@ impl<'r, 't, H: HandlerTypes> Element<'r, 't, H> {
 
     fn prepend_chunk(&mut self, chunk: StringChunk) {
         if self.can_have_content {
+            self.start_tag.set_self_closing_syntax(false);
             self.start_tag
                 .mutations
                 .mutate()
@@ -434,6 +435,7 @@ impl<'r, 't, H: HandlerTypes> Element<'r, 't, H> {
 
     fn append_chunk(&mut self, chunk: StringChunk) {
         if self.can_have_content {
+            self.start_tag.set_self_closing_syntax(false);
             self.end_tag_mutations_mut().content_before.push_back(chunk);
         }
     }
@@ -492,6 +494,7 @@ impl<'r, 't, H: HandlerTypes> Element<'r, 't, H> {
 
     fn set_inner_content_chunk(&mut self, chunk: StringChunk) {
         if self.can_have_content {
+            self.start_tag.set_self_closing_syntax(false);
             self.remove_content();
             self.start_tag
                 .mutations

src/rewritable_units/tokens/start_tag.rs

@@ -117,6 +117,10 @@ impl<'i> StartTag<'i> {
         self.self_closing
     }
 
+    pub(crate) fn set_self_closing_syntax(&mut self, has_slash: bool) {
+        self.self_closing = has_slash;
+    }
+
     /// Inserts `content` before the start tag.
     ///
     /// Consequent calls to the method append `content` to the previously inserted content.

src/rewriter/mod.rs

@@ -446,6 +446,30 @@ mod tests {
         assert_eq!(res, "<!-- 42 --><span><!--hello--></span>");
     }
 
+    #[test]
+    fn rewrite_incorrect_self_closing() {
+        let res = rewrite_str::<LocalHandlerTypes>(
+            "<title /></title><div/></div><style /></style><script /></script>
+            <br/><br><embed/><embed> <svg><a/><path/><path></path></svg>",
+            RewriteStrSettings {
+                element_content_handlers: vec![element!("*:not(svg)", |el| {
+                    el.set_attribute("s", if el.is_self_closing() { "y" } else { "n" })?;
+                    el.set_attribute("c", if el.can_have_content() { "y" } else { "n" })?;
+                    el.append("…", ContentType::Text);
+                    Ok(())
+                })],
+                ..RewriteStrSettings::new()
+            },
+        )
+        .unwrap();
+
+        assert_eq!(
+            res,
+            r#"<title s="y" c="y">…</title><div s="y" c="y">…</div><style s="y" c="y">…</style><script s="y" c="y">…</script>
+            <br s="y" c="n" /><br s="n" c="n"><embed s="y" c="n" /><embed s="n" c="n"> <svg><a s="y" c="n" /><path s="y" c="n" /><path s="n" c="y">…</path></svg>"#
+        );
+    }
+
     #[test]
     fn rewrite_arbitrary_settings() {
         let res = rewrite_str("<span>Some text</span>", Settings::new()).unwrap();