48 lines
1.9 KiB
OCaml
48 lines
1.9 KiB
OCaml
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(*
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* Copyright (c) mirage-bootvar AUTHORS
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*)
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(* Split string into whitespace-separated substrings,
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taking into account quoting *)
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type state = Quoted_escaped | Quoted | Escaped | Normal
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let chars_to_str = function
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| [] -> []
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| chars ->
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let chars = List.rev chars in
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[ String.init (List.length chars) (List.nth chars) ]
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let parse s =
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let l = String.length s in
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let rec loop acc curr state idx =
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if idx = l then
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if state = Normal then Ok (List.rev (chars_to_str curr @ acc))
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else Error "bad input line - either escaped or quoted or both"
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else
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match (state, String.unsafe_get s idx) with
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| Normal, ' ' -> loop (chars_to_str curr @ acc) [] state (idx + 1)
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| Escaped, c -> loop acc (c :: curr) Normal (idx + 1)
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| Quoted_escaped, c -> loop acc (c :: curr) Quoted (idx + 1)
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| Quoted, '\\' -> loop acc curr Quoted_escaped (idx + 1)
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| Quoted, '"' -> loop acc curr Normal (idx + 1)
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| Quoted, c -> loop acc (c :: curr) Quoted (idx + 1)
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| Normal, '\\' -> loop acc curr Escaped (idx + 1)
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| Normal, '"' -> loop acc curr Quoted (idx + 1)
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| Normal, c -> loop acc (c :: curr) Normal (idx + 1)
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in
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loop [] [] Normal 0
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