nvim-treesitter/queries/scheme/highlights.scm

; A highlight query can override the highlights queries before it.
; So the order is important.
; We should highlight general rules, then highlight special forms.
(number) @number

(character) @character

(boolean) @boolean

(string) @string

[
  (comment)
  (block_comment)
] @comment @spell

; highlight for datum comment
; copied from ../clojure/highlights.scm
([
  (comment)
  (directive)
] @comment
  (#set! "priority" 105))

(escape_sequence) @string.escape

[
  "("
  ")"
  "["
  "]"
  "{"
  "}"
] @punctuation.bracket

; variables
(symbol) @variable

((symbol) @variable.builtin
  (#any-of? @variable.builtin "..." "."))

; procedure
(list
  .
  (symbol) @function)

; special forms
(list
  "["
  (symbol)+ @variable
  "]")

(list
  .
  (symbol) @_f
  .
  (list
    (symbol) @variable)
  (#any-of? @_f "lambda" "λ"))

(list
  .
  (symbol) @_f
  .
  (list
    (list
      (symbol) @variable))
  (#any-of? @_f "let" "let*" "let-syntax" "let-values" "let*-values" "letrec" "letrec*" "letrec-syntax"))

; operators
((symbol) @operator
  (#any-of? @operator "+" "-" "*" "/" "=" "<=" ">=" "<" ">"))

; keyword
((symbol) @keyword
  (#any-of? @keyword "define" "lambda" "λ" "begin" "do" "define-syntax" "and" "or" "if" "cond" "case" "when" "unless" "else" "=>" "let" "let*" "let-syntax" "let-values" "let*-values" "letrec" "letrec*" "letrec-syntax" "set!" "syntax-rules" "identifier-syntax" "quote" "unquote" "quote-splicing" "quasiquote" "unquote-splicing" "delay" "assert" "library" "export" "import" "rename" "only" "except" "prefix"))

((symbol) @keyword.conditional
  (#any-of? @keyword.conditional "if" "cond" "case" "when" "unless"))

; quote
(quote
  "'"
  (symbol)) @string.special.symbol

(list
  .
  (symbol) @_f
  (#eq? @_f "quote")) @string.special.symbol

; library
(list
  .
  (symbol) @_lib
  .
  (symbol) @module
  (#eq? @_lib "library"))

; builtin procedures
; procedures in R5RS and R6RS but not in R6RS-lib
((symbol) @function.builtin
  ; format-ignore
  (#any-of? @function.builtin
    ; eq
    "eqv?" "eq?" "equal?"
    ; number
    "number?" "complex?" "real?" "rational?" "integer?"
    "exact?" "inexact?"
    "zero?" "positive?" "negative?" "odd?" "even?" "finite?" "infinite?" "nan?"
    "max" "min"
    "abs" "quotient" "remainder" "modulo"
    "div" "div0" "mod" "mod0" "div-and-mod" "div0-and-mod0"
    "gcd" "lcm" "numerator" "denominator"
    "floor" "ceiling" "truncate" "round"
    "rationalize"
    "exp" "log" "sin" "cos" "tan" "asin" "acos" "atan"
    "sqrt" "expt"
    "exact-integer-sqrt"
    "make-rectangular" "make-polar" "real-part" "imag-part" "magnitude" "angle"
    "real-valued" "rational-valued?" "integer-valued?"
    "exact" "inexact" "exact->inexact" "inexact->exact"
    "number->string" "string->number"
    ; boolean
    "boolean?" "not" "boolean=?"
    ; pair
    "pair?" "cons" 
    "car" "cdr" 
    "caar" "cadr" "cdar" "cddr" 
    "caaar" "caadr" "cadar" "caddr" "cdaar" "cdadr" "cddar" "cdddr"
    "caaaar" "caaadr" "caadar" "caaddr" "cadaar" "cadadr" "caddar" "cadddr"
    "cdaaar" "cdaadr" "cdadar" "cdaddr" "cddaar" "cddadr" "cdddar" "cddddr"
    "set-car!" "set-cdr!"
    ; list
    "null?" "list?"
    "list" "length" "append" "reverse" "list-tail" "list-ref"
    "map" "for-each"
    "memq" "memv" "member" "assq" "assv" "assoc"
    ; symbol
    "symbol?" "symbol->string" "string->symbol" "symbol=?"
    ; char
    "char?" "char=?" "char<?" "char>?" "char<=?" "char>=?"
    "char-ci=?" "char-ci<?" "char-ci>?" "char-ci<=?" "char-ci>=?"
    "char-alphabetic?" "char-numeric?" "char-whitespace?" "char-upper-case?" "char-lower-case?"
    "char->integer" "integer->char"
    "char-upcase" "char-downcase"
    ; string
    "string?" "make-string" "string" "string-length" "string-ref" "string-set!"
    "string=?" "string-ci=?" "string<?" "string>?" "string<=?" "string>=?"
    "string-ci<?" "string-ci>?" "string-ci<=?" "string-ci>=?"
    "substring" "string-append" "string->list" "list->string"
    "string-for-each"
    "string-copy" "string-fill!"
    "string-upcase" "string-downcase"
    ; vector
    "vector?" "make-vector" "vector" "vector-length" "vector-ref" "vector-set!"
    "vector->list" "list->vector" "vector-fill!" "vector-map" "vector-for-each"
    ; bytevector
    "bytevector?" "native-endianness"
    "make-bytevector" "bytevector-length" "bytevector=?" "bytevector-fill!"
    "bytevector-copy!" "bytevector-copy"
    ; error
    "error" "assertion-violation"
    ; control
    "procedure?" "apply" "force"
    "call-with-current-continuation" "call/cc"
    "values" "call-with-values" "dynamic-wind"
    "eval" "scheme-report-environment" "null-environment" "interaction-environment"
    ; IO
    "call-with-input-file" "call-with-output-file" "input-port?" "output-port?"
    "current-input-port" "current-output-port" "with-input-from-file" "with-output-to-file"
    "open-input-file" "open-output-file" "close-input-port" "close-output-port"
    ; input
    "read" "read-char" "peek-char" "eof-object?" "char-ready?"
    ; output
    "write" "display" "newline" "write-char"
    ; system
    "load" "transcript-on" "transcript-off"))