Add DTD language support (#6644)

- Added syntax highlighting for the DTD subset of the XML spec.
- Included .dtd and .ent as common file extensions

2 files changed, 41 insertions, 0 deletions

diff --git a/runtime/queries/dtd/highlights.scm b/runtime/queries/dtd/highlights.scm
new file mode 100644
index 00000000..cb3d482b
--- /dev/null
+++ b/runtime/queries/dtd/highlights.scm
@@ -0,0 +1,39 @@
+; highlights.scm
+
+(comment) @comment
+
+[
+    "ELEMENT"
+    "ATTLIST"
+] @keyword
+
+[
+    "#REQUIRED"
+    "#IMPLIED"
+    "#FIXED"
+    "#PCDATA"
+] @keyword.directive
+
+[
+    "EMPTY"
+    "ANY"
+    "SYSTEM"
+    "PUBLIC"
+] @constant
+
+(element_name) @module
+
+
+(attribute_name) @attribute
+
+(system_literal) @string
+(pubid_literal) @string
+(attribute_value) @string
+
+[
+    ">"
+    "</"
+    "<?"
+    "?>"
+    "<!"
+] @punctuation.bracket
diff --git a/runtime/queries/dtd/injections.scm b/runtime/queries/dtd/injections.scm
new file mode 100644
index 00000000..321c90ad
--- /dev/null
+++ b/runtime/queries/dtd/injections.scm
@@ -0,0 +1,2 @@
+((comment) @injection.content
+ (#set! injection.language "comment"))