Improve HEEx brackets (#78)

Overhauls and excludes bracket colorization for all HTML tags; this also
scopes all brackets so that detection only happens where it should

Author: AlternateRT

languages/heex/brackets.scm

@@ -1,3 +1,81 @@
-("{" @open "}" @close)
-("<" @open ">" @close)
-("</" @open ">" @close)
+(expression
+  "{" @open
+  "}" @close)
+
+(directive
+  _ @open
+  [
+    (expression_value)
+    (partial_expression_value)
+    (ending_expression_value)
+  ]
+  _ @close)
+
+(start_tag
+  "<" @open
+  ">" @close
+  (#set! rainbow.exclude))
+
+(end_tag
+  "</" @open
+  ">" @close
+  (#set! rainbow.exclude))
+
+(self_closing_tag
+  "<" @open
+  "/>" @close
+  (#set! rainbow.exclude))
+
+(tag
+  (start_tag) @open
+  (end_tag) @close
+  (#set! newline.only)
+  (#set! rainbow.exclude))
+
+(start_slot
+  "<:" @open
+  ">" @close
+  (#set! rainbow.exclude))
+
+(end_slot
+  "</:" @open
+  ">" @close
+  (#set! rainbow.exclude))
+
+(self_closing_slot
+  "<:" @open
+  "/>" @close
+  (#set! rainbow.exclude))
+
+(slot
+  (start_slot) @open
+  (end_slot) @close
+  (#set! newline.only)
+  (#set! rainbow.exclude))
+
+(start_component
+  "<" @open
+  ">" @close
+  (#set! rainbow.exclude))
+
+(end_component
+  "</" @open
+  ">" @close
+  (#set! rainbow.exclude))
+
+(self_closing_component
+  "<" @open
+  "/>" @close
+  (#set! rainbow.exclude))
+
+(component
+  (start_component) @open
+  (end_component) @close
+  (#set! newline.only)
+  (#set! rainbow.exclude))
+
+(quoted_attribute_value
+  _ @open
+  (attribute_value)
+  _ @close
+  (#set! rainbow.exclude))