feat: add ocamllex parser and highlights

lua/nvim-treesitter/parsers.lua

@@ -145,6 +145,14 @@ list.ocaml_interface = {
   filetype = 'ocamlinterface'
 }
 
+list.ocamllex = {
+  install_info = {
+    url = "https://github.com/atom-ocaml/tree-sitter-ocamllex",
+    files = { "src/parser.c", "src/scanner.cc" },
+  },
+  maintainers = {'@undu'},
+}
+
 list.swift = {
   install_info = {
     url = "https://github.com/tree-sitter/tree-sitter-swift",

queries/ocamllex/highlights.scm

@@ -0,0 +1,27 @@
+
+[(lexer_argument) (regexp_name) (any)] @type
+
+(lexer_entry_name) @function
+
+["as" "let" "parse" "rule"] @keyword
+
+[(eof) (character)] @character
+(string) @string
+
+(character_range "-" @operator)
+(character_set "^" @operator)
+(regexp_alternative ["|"] @operator)
+(regexp_difference ["#"] @operator)
+(regexp_option ["?"] @operator)
+(regexp_repetition ["*"] @operator)
+(regexp_strict_repetition ["+"] @operator)
+
+(action ["{" "}"] @punctuation.special) @embedded
+(character_set ["[" "]"] @punctuation.bracket)
+(parenthesized_regexp ["(" ")"] @punctuation.bracket)
+
+["="] @punctuation.delimiter
+(lexer_entry "|" @punctuation.delimiter)
+
+(comment) @comment
+(ERROR) @error