Add support for output modifiers for tags

grammar.js

@@ -79,6 +79,7 @@ module.exports = grammar({
         )
       ),
       optional(field('attrs', $.attrs)),
+      optional($._output_modifiers),
       choice(
         $._inline,
         seq(

src/grammar.json

@@ -182,6 +182,18 @@
               }
             ]
           },
+          {
+            "type": "CHOICE",
+            "members": [
+              {
+                "type": "SYMBOL",
+                "name": "_output_modifiers"
+              },
+              {
+                "type": "BLANK"
+              }
+            ]
+          },
           {
             "type": "CHOICE",
             "members": [

src/node-types.json

@@ -157,7 +157,7 @@
       }
     },
     "children": {
-      "multiple": false,
+      "multiple": true,
       "required": false,
       "types": [
         {
@@ -171,6 +171,18 @@
         {
           "type": "nested_inline",
           "named": true
+        },
+        {
+          "type": "output_modifier_leading_whitespace",
+          "named": true
+        },
+        {
+          "type": "output_modifier_legacy_trailing_whitespace",
+          "named": true
+        },
+        {
+          "type": "output_modifier_trailing_whitespace",
+          "named": true
         }
       ]
     }

test/corpus/tags.txt

@@ -0,0 +1,31 @@
+============================
+Tag and shortcut css classes
+============================
+
+span.menu.active
+
+---
+
+(source_file
+  (element
+    (tag_name)
+    (attr_shortcuts
+      (shortcut_class
+        (css_identifier))
+      (shortcut_class
+        (css_identifier)))))
+
+===============================
+Tag with traling space modifier
+===============================
+
+.menu<
+
+---
+
+(source_file
+  (element
+    (attr_shortcuts
+      (shortcut_class
+        (css_identifier)))
+    (output_modifier_leading_whitespace)))