Add tree-sitter-eex parser for (L)EEx files (#2351)

lua/nvim-treesitter/parsers.lua

@@ -343,6 +343,16 @@ list.surface = {
   maintainers = { "@connorlay" },
 }
 
+list.eex = {
+  install_info = {
+    url = "https://github.com/connorlay/tree-sitter-eex",
+    files = { "src/parser.c" },
+    branch = "main",
+  },
+  filetype = "eex",
+  maintainers = { "@connorlay" },
+}
+
 list.heex = {
   install_info = {
     url = "https://github.com/connorlay/tree-sitter-heex",

queries/eex/highlights.scm

@@ -0,0 +1,15 @@
+[
+  "%>"
+  "--%>"
+  "<%!--"
+  "<%"
+  "<%#"
+  "<%%="
+  "<%="
+] @tag.delimiter
+
+; EEx comments are highlighted as such
+(comment) @comment
+
+; Tree-sitter parser errors
+(ERROR) @error

queries/eex/injections.scm

@@ -0,0 +1,5 @@
+; EEx expressions are Elixir
+(expression) @elixir
+
+; EEx expressions can span multiple interpolated lines
+(partial_expression) @elixir @combined

queries/elixir/injections.scm

@@ -24,6 +24,11 @@
 (#eq? @_sigil_name "F"))
 
 ; Zigler
+(sigil
+  (sigil_name) @_sigil_name
+  (quoted_content) @eex
+(#any-of? @_sigil_name "E" "L"))
+
 (sigil
   (sigil_name) @_sigil_name
   (quoted_content) @zig