53 lines
1.4 KiB
OCaml
53 lines
1.4 KiB
OCaml
open Types
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type serialiser = { mutable buf : bytes; mutable pos : int }
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(* convert ansi variants to appropriate output codes *)
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let write_ansi a =
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let rec intersperse sep ls =
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match ls with
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| [] | [ _ ] -> ls
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| hd :: tl -> hd :: sep :: intersperse sep tl
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and string_of_colour ?(bg = false) c =
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let prefix = if bg then "4" else "3" and si = string_of_int in
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c |> function
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| Intrinsic i -> prefix ^ si i
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| Simple i -> prefix ^ "8;5;" ^ si i
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| RGB (r, g, b) -> prefix ^ "8;2;" ^ si r ^ ";" ^ si g ^ ";" ^ si b
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in
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let ansi =
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a
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|> List.map (fun a ->
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match a with
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| Fg c -> string_of_colour c
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| Bg c -> string_of_colour ~bg:true c
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| Reset -> "0"
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| Other i -> string_of_int i)
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|> intersperse ";"
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|> List.fold_left (fun acc el -> acc ^ el) ""
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in
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"\x1b[" ^ ansi ^ "m"
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(* print all serialised data and reset buffer *)
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let flush t =
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if t.pos > 0 then (
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print_bytes (Bytes.sub t.buf 0 t.pos);
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t.pos <- 0)
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let serialise t chunk =
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let input =
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match chunk with
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| Text s -> s
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| Separator s -> s
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| Delimiter s -> s
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| Ansi a -> write_ansi a
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and sz = Bytes.length t.buf in
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let input_sz = String.length input in
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if t.pos + input_sz > sz then flush t;
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if input_sz > sz then print_string input
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else (
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Bytes.blit_string input 0 t.buf t.pos input_sz;
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t.pos <- t.pos + input_sz)
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let create = { buf = Bytes.create 4096; pos = 0 }
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