54 lines
1.7 KiB
OCaml
54 lines
1.7 KiB
OCaml
open Stdlib
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(*
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(c) 2023 Tan Kian-ting (main author) & Raphaël Proust (PR giver)
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Under MIT License
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习包子 梁家河小学博士 清零宗 习炀帝 庆丰大帝
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独裁国贼 新疆集中营 光复香港时代革命 祈翠 南蒙古独立 香港独立
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西藏独立 台湾独立 64天安门虐杀 六四真相
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*)
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(**
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The Module needs [Uutf] Module.
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It only contains [split_string_by_unicode_codepoint], which splits an OCaml string [str] to a [string list]
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*)
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(** Split an OCaml string [str] to a [string list]
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{b Arguments}
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{ul
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{- [str] the string to be splitted.
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}}
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{b Example}
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{[let example= "m̄知 who you're." (*don't know who you are*) in
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List.map (fun x -> print_string (x ^ ", ")) (split_string_by_unicode_codepoint example);;
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(*it will output : "m, ̄, 知, , w, h, o, , y, o, u, ', r, e, ., "*)]}
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*)
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let split_string_by_unicode_codepoint str =
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(*Split a Ocaml string [str] to a `str list` *)
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let pred_codepoint = ref (-1) in
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let segmented_unit_list = ref [] in
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let iterator () y _ =
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let () = if !pred_codepoint > -1 then
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let current_codepoint = y in
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let pred_char_len = current_codepoint - !pred_codepoint in
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let unit_substring = Stdlib.String.sub str !pred_codepoint pred_char_len in
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segmented_unit_list := unit_substring :: !segmented_unit_list
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in
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let () = pred_codepoint := y in
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()
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in
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let _ = Uutf.String.fold_utf_8 iterator () str in
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let last_char_len = (Stdlib.String.length str) - !pred_codepoint in
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let () =
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if last_char_len > 0 then
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let unit_substring = Stdlib.String.sub str !pred_codepoint last_char_len in
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segmented_unit_list := unit_substring :: !segmented_unit_list
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in
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List.rev !segmented_unit_list;;
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