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+; Highlights queries from Matthew Fluet (https://github.com/MatthewFluet/tree-sitter-sml)
+;
+; MIT License
+;
+; Copyright (c) 2022 Matthew Fluet
+;
+; Permission is hereby granted, free of charge, to any person obtaining a copy
+; of this software and associated documentation files (the "Software"), to deal
+; in the Software without restriction, including without limitation the rights
+; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+; copies of the Software, and to permit persons to whom the Software is
+; furnished to do so, subject to the following conditions:
+;
+; The above copyright notice and this permission notice shall be included in all
+; copies or substantial portions of the Software.
+;
+; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+; SOFTWARE.
+
+;; *******************************************************************
+;; Comments
+;; *******************************************************************
+
+[(block_comment) (line_comment)] @comment
+
+;; *******************************************************************
+;; Keywords
+;; *******************************************************************
+
+[
+ ;; Reserved Words Core
+ "abstype" "and" "andalso" "as" "case" "datatype" "do" "else" "end"
+ "exception" "fn" "fun" "handle" "if" "in" "infix" "infixr" "let"
+ "local" "nonfix" "of" "op" "open" "orelse" "raise" "rec" "then"
+ "type" "val" "with" "withtype" "while"
+ ;; Reserved Words Modules
+ "eqtype" "functor" "include" "sharing" "sig" "signature" "struct"
+ "structure" "where"
+] @keyword
+
+;; *******************************************************************
+;; Constants
+;; *******************************************************************
+
+(integer_scon) @constant.numeric.integer
+(real_scon) @constant.numeric.float
+(word_scon) @constant.numeric
+(string_scon) @string
+(char_scon) @constant.character
+
+;; *******************************************************************
+;; Types
+;; *******************************************************************
+
+(fn_ty "->" @type)
+(tuple_ty "*" @type)
+(paren_ty ["(" ")"] @type)
+(tyvar_ty (tyvar) @type)
+(record_ty
+ ["{" "," "}"] @type
+ (tyrow [(lab) ":"] @type)?
+ (ellipsis_tyrow ["..." ":"] @type)?)
+(tycon_ty
+ (tyseq ["(" "," ")"] @type)?
+ (longtycon) @type)
+
+;; *******************************************************************
+;; Constructors
+;; *******************************************************************
+
+;; Assume value identifiers starting with capital letter are constructors
+((vid) @constructor
+ (#match? @constructor "^[A-Z].*"))
+
+((vid) @constant.builtin (#eq? @constant.builtin "nil"))
+((vid) @constant.builtin.boolean
+ (#match? @constant.builtin.boolean "^(true|false)$"))
+((vid) @operator (#eq? @operator "::"))
+((vid) @keyword.storage.modifier (#eq? @keyword.storage.modifier "ref"))
+
+;; *******************************************************************
+;; Punctuation
+;; *******************************************************************
+
+["(" ")" "[" "]" "{" "}"] @punctuation.bracket
+["." "," ":" ";" "|" "=>" ":>"] @punctuation.delimiter