Allow custom preprocessors for 'vue' injections (#5268)

runtime/queries/vue/injections.scm

@@ -8,13 +8,37 @@
   (raw_text) @injection.content)
  (#set! injection.language "javascript"))
 
+; <script>
 ((script_element
+    (start_tag) @_no_lang
     (raw_text) @injection.content)
+  (#not-match? @_no_lang "lang=")
   (#set! injection.language "javascript"))
 
+; <script lang="...">
+((script_element
+  (start_tag
+    (attribute
+    (attribute_name) @_attr_name
+    (quoted_attribute_value (attribute_value) @injection.language)))
+  (raw_text) @injection.content)
+  (#eq? @_attr_name "lang"))
+
+; <style>
 ((style_element
+    (start_tag) @_no_lang
     (raw_text) @injection.content)
+  (#not-match? @_no_lang "lang=")
   (#set! injection.language "css"))
 
+; <style lang="...">
+((style_element
+  (start_tag
+    (attribute
+      (attribute_name) @_attr_name
+      (quoted_attribute_value (attribute_value) @injection.language)))
+   (raw_text) @injection.content)
+ (#eq? @_attr_name "lang"))
+
 ((comment) @injection.content
  (#set! injection.language "comment"))