add tree-sitter-eex

EEx is an templating language for Elixir. Since the incremental
parsing refactor we can used combined injections which allows us
to add EEx support.

book/src/generated/lang-support.md

@@ -9,6 +9,7 @@
 | css | ✓ |  |  | `vscode-css-language-server` |
 | dart | ✓ |  | ✓ | `dart` |
 | dockerfile | ✓ |  |  | `docker-langserver` |
+| eex | ✓ |  |  |  |
 | ejs | ✓ |  |  |  |
 | elixir | ✓ |  |  | `elixir-ls` |
 | elm | ✓ |  |  | `elm-language-server` |

languages.toml

@@ -1113,3 +1113,15 @@ grammar = "embedded-template"
 [[grammar]]
 name = "embedded-template"
 source = { git = "https://github.com/tree-sitter/tree-sitter-embedded-template", rev = "d21df11b0ecc6fd211dbe11278e92ef67bd17e97" }
+
+[[language]]
+name = "eex"
+scope = "source.eex"
+injection-regex = "eex"
+file-types = ["eex"]
+roots = []
+indent = { tab-width = 2, unit = "  " }
+
+[[grammar]]
+name = "eex"
+source = { git = "https://github.com/connorlay/tree-sitter-eex", rev = "f742f2fe327463335e8671a87c0b9b396905d1d1" }

runtime/queries/eex/highlights.scm

@@ -0,0 +1,6 @@
+; https://github.com/connorlay/tree-sitter-eex/blob/f742f2fe327463335e8671a87c0b9b396905d1d1/queries/highlights.scm
+
+; wrapping in (directive .. ) prevents us from highlighting '%>' in a comment as a keyword
+(directive ["<%" "<%=" "<%%" "<%%=" "%>"] @keyword)
+
+(comment) @comment

runtime/queries/eex/injections.scm

@@ -0,0 +1,9 @@
+; https://github.com/connorlay/tree-sitter-eex/blob/f742f2fe327463335e8671a87c0b9b396905d1d1/queries/injections.scm
+
+((directive (expression) @injection.content)
+ (#set! injection.language "elixir"))
+
+((partial_expression) @injection.content
+ (#set! injection.language "elixir")
+ (#set! injection.include-children)
+ (#set! injection.combined))