Source file opamShellCommand.ml
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module String = struct
module Sub = struct
type t = {
str : string;
start_pos : int;
end_pos : int;
}
let start_pos {start_pos; _} = start_pos
let is_empty {start_pos; end_pos; _} = end_pos - start_pos = 0
let tail ({start_pos; end_pos; _} as sub) =
if (start_pos : int) = (end_pos : int) then
sub
else
{sub with start_pos = start_pos + 1}
let head {str; start_pos; end_pos} =
if (start_pos : int) = (end_pos : int) then
None
else
Some str.[start_pos]
let span ~sat {str; start_pos; end_pos} =
let rec loop i str start_pos end_pos =
if i < end_pos && sat str.[i] then
loop (i + 1) str start_pos end_pos
else
({str; start_pos; end_pos = i},
{str; start_pos = i; end_pos})
in
loop start_pos str start_pos end_pos
let concat l =
let to_string {str; start_pos; end_pos} =
String.sub str start_pos (end_pos - start_pos)
in
List.fold_left (fun acc x -> acc ^ to_string x) "" l
let extend ~max {str; start_pos; end_pos} =
let rec loop i str start_pos str_len =
if i < str_len then
loop (i + 1) str start_pos str_len
else
{str; start_pos; end_pos = i}
in
loop start_pos str start_pos
(min (end_pos + max : int) (String.length str))
end
let sub str = {Sub.str; start_pos = 0; end_pos = String.length str}
let of_char c = String.make 1 c
let dump fmt s =
let escape_digit = function
| 0 -> '0'
| 1 -> '1'
| 2 -> '2'
| 3 -> '3'
| 4 -> '4'
| 5 -> '5'
| 6 -> '6'
| 7 -> '7'
| 8 -> '8'
| 9 -> '9'
| 10 -> 'A'
| 11 -> 'B'
| 12 -> 'C'
| 13 -> 'D'
| 14 -> 'E'
| 15 -> 'F'
| _ -> assert false
in
let dump_escaped_str fmt s i len =
if i < len then begin
match s.[i] with
| '\b' -> Format.pp_print_string fmt "\\b"
| '\t' -> Format.pp_print_string fmt "\\t"
| '\n' -> Format.pp_print_string fmt "\\n"
| '\r' -> Format.pp_print_string fmt "\\r"
| '\"' -> Format.pp_print_string fmt "\\\""
| '\\' -> Format.pp_print_string fmt "\\\\"
| ' '..'~' as c -> Format.pp_print_char fmt c
| c ->
let code = Char.code c in
Format.fprintf fmt "\\x%c%c"
(escape_digit (code / 16)) (escape_digit (code mod 16))
end
in
Format.pp_print_char fmt '"';
dump_escaped_str fmt s 0 (String.length s);
Format.pp_print_char fmt '"';
end
let parse_cmdline s =
try
let err_unclosed kind s =
failwith
(Format.sprintf "%d: unclosed %s quote delimited string"
(String.Sub.start_pos s) kind)
in
let parse_squoted s =
let sat = function '\'' -> false | _ -> true in
let tok, rem = String.Sub.span ~sat (String.Sub.tail s) in
if not (String.Sub.is_empty rem) then
(tok, String.Sub.tail rem)
else
err_unclosed "single" s
in
let parse_dquoted acc s =
let is_data = function '\\' | '"' -> false | _ -> true in
let rec loop acc s =
let data, rem = String.Sub.span ~sat:is_data s in
match String.Sub.head rem with
| Some '"' -> (data :: acc, String.Sub.tail rem)
| Some '\\' ->
let rem = String.Sub.tail rem in
begin match String.Sub.head rem with
| Some ('"' | '\\' | '$' | '`' as c) ->
let acc = String.sub (String.of_char c) :: data :: acc in
loop acc (String.Sub.tail rem)
| Some '\n' -> loop (data :: acc) (String.Sub.tail rem)
| Some _c ->
let acc = String.Sub.extend ~max:2 data :: acc in
loop acc (String.Sub.tail rem)
| None ->
err_unclosed "double" s
end
| None -> err_unclosed "double" s
| Some _ -> assert false
in
loop acc (String.Sub.tail s)
in
let parse_token s =
let rec loop acc s =
match String.Sub.head s with
| None -> (acc, s)
| Some c when OpamStd.Char.is_whitespace c -> (acc, s)
| Some '\'' ->
let tok, rem = parse_squoted s in
loop (tok :: acc) rem
| Some '\"' ->
let acc, rem = parse_dquoted acc s in
loop acc rem
| Some _c ->
let sat = function
| '\'' | '\"' -> false
| c -> not (OpamStd.Char.is_whitespace c)
in
let tok, rem = String.Sub.span ~sat s in
loop (tok :: acc) rem
in
loop [] s
in
let rec loop acc s =
match String.Sub.head s with
| None when acc = [] -> failwith "empty command"
| None -> acc
| Some c when OpamStd.Char.is_whitespace c ->
loop acc (String.Sub.tail s)
| Some _ ->
let token, s = parse_token s in
loop (String.Sub.concat (List.rev token) :: acc) s
in
Ok (loop [] (String.sub s))
with Failure err ->
Error (Format.asprintf "command line %a:%s" String.dump s err)
let of_string s =
match parse_cmdline s with
| Ok x -> List.rev x
| Error msg -> OpamConsole.error_and_exit `Bad_arguments "%s" msg