Add Graphviz Dot lang support (#3241)

Co-authored-by: Michael Davis <mcarsondavis@gmail.com>

book/src/generated/lang-support.md

@@ -13,6 +13,7 @@
 | dart | ✓ |  | ✓ | `dart` |
 | devicetree | ✓ |  | ✓ |  |
 | dockerfile | ✓ |  |  | `docker-langserver` |
+| dot | ✓ |  |  | `dot-language-server` |
 | edoc | ✓ |  |  |  |
 | eex | ✓ |  |  |  |
 | ejs | ✓ |  |  |  |

languages.toml

@@ -1570,3 +1570,17 @@ indent = { tab-width = 2, unit = "  " }
 [[grammar]]
 name = "ungrammar"
 source = { git = "https://github.com/Philipp-M/tree-sitter-ungrammar", rev = "0113de880a58ea14f2a75802e9b99fcc25003d9c" }
+
+[[language]]
+name = "dot"
+scope = "source.dot"
+injection-regex = "dot"
+file-types = ["dot"]
+roots = []
+comment-token = "//"
+indent = { tab-width = 4, unit = "    " }
+language-server = { command = "dot-language-server", args = ["--stdio"] }
+
+[[grammar]]
+name = "dot"
+source = { git = "https://github.com/rydesun/tree-sitter-dot", rev = "917230743aa10f45a408fea2ddb54bbbf5fbe7b7" }

runtime/queries/dot/highlights.scm

@@ -0,0 +1,43 @@
+(keyword) @keyword
+(string_literal) @string
+(number_literal) @constant.numeric
+
+[
+  (edgeop)
+  (operator)
+] @operator
+
+[
+  ","
+  ";"
+] @punctuation.delimiter
+
+[
+  "{"
+  "}"
+  "["
+  "]"
+  "<"
+  ">"
+] @punctuation.bracket
+
+(subgraph
+  id: (id
+    (identifier) @namespace)
+)
+
+(attribute
+  name: (id
+    (identifier) @type)
+  value: (id
+    (identifier) @constant)
+)
+
+[
+  (comment)
+  (preproc)
+] @comment
+
+(ERROR) @error
+
+(identifier) @variable

runtime/queries/dot/injections.scm

@@ -0,0 +1,2 @@
+((html_internal) @injection.content
+  (#set! injection.language "html"))