Source file parser.ml
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open Core_kernel
open Int.Replace_polymorphic_compare
include Parser_intf
module Body = struct
module T = struct
type 'a t =
{ regex_string : Rope.t
; num_submatches : int
; to_result : int -> string option array -> 'a
}
let return x =
{ regex_string = Rope.of_string ""
; num_submatches = 0
; to_result = (fun _ _ -> x)
}
;;
let map =
`Custom
(fun t ~f ->
{ t with to_result = (fun shift matches -> f (t.to_result shift matches)) })
;;
let apply tf tx =
let to_result shift matches =
let f = tf.to_result shift matches in
let x = tx.to_result (shift + tf.num_submatches) matches in
f x
in
{ regex_string = Rope.(tf.regex_string ^ tx.regex_string)
; num_submatches = tf.num_submatches + tx.num_submatches
; to_result
}
;;
end
include T
include Applicative.Make (T)
let to_regex_string t = Rope.to_string t.regex_string
let sexp_of_t _sexp_of_a t = Sexp.Atom (to_regex_string t)
let to_re2 ?(case_sensitive = true) t =
let options =
{ Options.default with case_sensitive; encoding = Latin1; dot_nl = true }
in
let s = to_regex_string t in
match Regex.create ~options s with
| Ok rex -> rex
| Error e ->
failwiths
~here:[%here]
"Re2.Parser.to_re2 BUG: failed to compile"
(s, e)
[%sexp_of: string * Error.t]
;;
let compile ?case_sensitive t =
let rex = to_re2 ?case_sensitive t in
let to_result = t.to_result in
Staged.stage (fun s ->
match Regex.get_matches_exn ~max:1 rex s with
| [] -> None
| m :: _ ->
let m = Regex.without_trailing_none m in
Some (to_result 1 (Regex.Match.get_all m)))
;;
let run ?case_sensitive t = Staged.unstage (compile ?case_sensitive t)
let ignore_m t =
{ regex_string = t.regex_string
; num_submatches = t.num_submatches
; to_result = (fun _ _ -> ())
}
;;
let matches ?case_sensitive t =
let r = to_re2 ?case_sensitive (ignore_m t) in
fun input -> Regex.matches r input
;;
module For_test = struct
let should_match_with_case ~case_sensitive sexp_of_r rex inp result =
[%test_pred: r t * string]
~message:"should_match"
(fun (rex, inp) -> matches ~case_sensitive rex inp)
(rex, inp);
[%test_result: Sexp.t option]
~expect:(Some (sexp_of_r result))
(Option.map ~f:sexp_of_r (run ~case_sensitive rex inp))
;;
let should_not_match_with_case ~case_sensitive rex inp =
[%test_pred: _ t * string]
~message:"should_not_match"
(fun (rex, inp) -> not (matches ~case_sensitive rex inp))
(rex, inp);
[%test_pred: string t * string]
(fun (rex, inp) -> Option.is_none (run ~case_sensitive rex inp))
(rex, inp)
;;
let match_only_if_case_insensitive sexp_of_r rex inp result =
should_match_with_case ~case_sensitive:false sexp_of_r rex inp result;
should_not_match_with_case ~case_sensitive:true rex inp
;;
let should_match sexp_of_r rex inp result =
should_match_with_case ~case_sensitive:true sexp_of_r rex inp result;
should_match_with_case ~case_sensitive:false sexp_of_r rex inp result
;;
let should_match_string = should_match String.sexp_of_t
let should_match_unit rex inp = should_match Unit.sexp_of_t rex inp ()
let should_not_match rex inp =
should_not_match_with_case ~case_sensitive:true rex inp;
should_not_match_with_case ~case_sensitive:false rex inp
;;
end
open For_test
let fail =
{ regex_string = Rope.of_string "$x"
; num_submatches = 0
; to_result =
(fun _ _ -> failwith "Re2.Parser.fail BUG: something matched regex '$x'")
}
;;
let%test_unit _ = should_not_match fail ""
let%test_unit _ = should_not_match fail "$x"
let%test_unit _ = should_not_match fail "foo\nxyz"
let of_captureless_string regex_string =
{ regex_string = Rope.of_string regex_string
; num_submatches = 0
; to_result = (fun _ _ -> ())
}
;;
let string s = of_captureless_string (Regex.escape s)
let%test_unit _ = should_match_unit (string "blah") "bloblahba"
let%test_unit _ = should_not_match (string ".") "x"
let%test_unit _ =
let nasty_string = "^(he+l*l.o)[abc]{{\\\\$" in
should_match_unit (string nasty_string) ("before" ^ nasty_string ^ "after")
;;
let%test_unit _ = should_match_unit (string "blah\000blee") "blah\000blee"
let%test_unit _ = should_not_match (string "blah\000nope") "blah\000blee"
let and_capture t =
{ regex_string = Rope.(of_string "(" ^ t.regex_string ^ of_string ")")
; num_submatches = t.num_submatches + 1
; to_result =
(fun shift matches ->
( t.to_result (shift + 1) matches
, Option.value_exn
~message:"Re2.Parser.capture bug: failed to capture"
matches.(shift) ))
}
;;
let capture t = map (and_capture t) ~f:(fun ((), s) -> s)
let%test_unit _ =
match_only_if_case_insensitive
[%sexp_of: string]
(capture (string "bLaH"))
"baBLAHba"
"BLAH"
;;
let%test_unit _ =
should_match
[%sexp_of: string * string]
(both
(capture (string "a") <* ignore_m (capture (string "b")))
(capture (string "c")))
"abc"
("a", "c")
;;
let or_ = function
| [] -> fail
| [ x ] -> x
| ts ->
{ regex_string =
Rope.(
of_string "(?:"
^ List.reduce_exn
~f:(fun x y -> x ^ of_string "|" ^ y)
(List.map ts ~f:(fun t -> Rope.(of_string "()" ^ t.regex_string)))
^ of_string ")")
; num_submatches =
List.sum (module Int) ts ~f:(fun t -> t.num_submatches + 1)
; to_result =
(let rec go i matches = function
| [] -> failwith "Re2.Parser.or_.to_result bug: called on non-match"
| t :: ts ->
if Option.is_some matches.(i)
then t.to_result (i + 1) matches
else go (i + 1 + t.num_submatches) matches ts
in
fun shift matches -> go shift matches ts)
}
;;
let%test_unit _ =
should_match_string (or_ [ capture (string "a"); capture (string "b") ]) "a" "a"
;;
let%test_unit _ =
should_match_string (capture (or_ [ string "a"; string "b" ])) "a" "a"
;;
let%test_unit _ = should_not_match (or_ [ string "a"; string "b" ]) "c"
let%test_unit _ =
should_match_string (or_ [ string "b"; string "c" ] *> capture (string "a")) "ca" "a"
;;
let%test_unit _ =
should_match_string (capture (string "a") <* or_ [ string "b"; string "c" ]) "ac" "a"
;;
let%test_unit _ =
should_match_string
(ignore_m (or_ [ string "a"; string "b" ]) *> capture (string "c"))
"ac"
"c"
;;
let optional ?(greedy = true) t =
let q = Rope.of_string (if greedy then "?" else "??") in
{ regex_string = Rope.(of_string "(" ^ t.regex_string ^ of_string ")" ^ q)
; num_submatches = t.num_submatches + 1
; to_result =
(fun shift matches ->
Option.map matches.(shift) ~f:(fun _ -> t.to_result (shift + 1) matches))
}
;;
let%test_unit _ =
should_match [%sexp_of: unit option] (optional (string "x")) "x" (Some ())
;;
let%test_unit _ =
should_match [%sexp_of: unit option] (optional ~greedy:false (string "x")) "x" None
;;
let with_quantity t ~greedy ~quantity =
let q = Rope.of_string (if greedy then "" else "?") in
{ regex_string =
Rope.(of_string "(?:" ^ t.regex_string ^ of_string ")" ^ of_string quantity ^ q)
; num_submatches = t.num_submatches
; to_result = (fun _ _ -> ())
}
;;
let repeat ?(greedy = true) ?(min = 0) ?(max = None) t =
let validate_if_some validate x =
Option.validate ~none:Validate.pass_unit ~some:validate x
in
Validate.of_list
[ Validate.name "min" (Int.validate_non_negative min)
; Validate.name "max" (validate_if_some (Int.validate_lbound ~min:(Incl min)) max)
; Validate.name
"re2 implementation restrictions"
(Validate.of_list
[ Int.validate_ubound ~max:(Incl 1000) min
; validate_if_some (Int.validate_ubound ~max:(Incl 1000)) max
])
]
|> Validate.maybe_raise;
match min, max with
| 0, None -> with_quantity t ~greedy ~quantity:"*"
| 1, None -> with_quantity t ~greedy ~quantity:"+"
| 0, Some 1 -> with_quantity t ~greedy ~quantity:"?"
| 0, Some 0 -> of_captureless_string ""
| 1, Some 1 -> ignore_m t
| min, None -> with_quantity t ~greedy ~quantity:(sprintf "{%d,}" min)
| min, Some max ->
if min = max
then with_quantity t ~greedy:true ~quantity:(sprintf "{%d}" min)
else with_quantity t ~greedy ~quantity:(sprintf "{%d,%d}" min max)
;;
let%test_module "repeat" =
(module struct
let%test_unit _ =
List.iter
~f:
([%test_pred: int option * int option * string * string option]
(fun (min, max, inp, result) ->
let a's = capture (repeat ?min ~max (string "a")) in
0
= [%compare: string option]
result
(run (string "c" *> a's <* string "b") inp)))
[ None, None, "caaab", Some "aaa"
; None, None, "cb", Some ""
; Some 0, None, "cb", Some ""
; Some 1, None, "cb", None
; Some 1, None, "cab", Some "a"
; Some 1, Some 2, "caaab", None
; Some 2, Some 2, "caaab", None
; Some 3, Some 3, "caaab", Some "aaa"
; Some 4, Some 4, "caaab", None
; Some 2, None, "caaab", Some "aaa"
; Some 0, Some 0, "cb", Some ""
; Some 1, Some 1, "cab", Some "a"
; None, Some 0, "cb", Some ""
]
;;
let%test _ = Exn.does_raise (fun () -> repeat ~min:3 ~max:(Some 2) fail)
let%test _ = Exn.does_raise (fun () -> repeat ~min:(-1) fail)
let%test _ = Exn.does_raise (fun () -> repeat ~max:(Some (-1)) fail)
let%test _ = Exn.does_raise (fun () -> repeat ~min:1001 fail)
let%test_unit _ =
should_match_string
(capture (repeat (or_ [ string "a"; string "b" ]) *> string "a"))
"baba"
"baba"
;;
let%test_unit _ =
should_match_string
(capture (repeat ~greedy:false (or_ [ string "a"; string "b" ]) *> string "a"))
"baba"
"ba"
;;
end)
;;
let times t n = repeat ~min:n ~max:(Some n) t
let%test_unit _ =
should_match_string
(capture (times (or_ [ string "a"; string "b" ]) 3))
"cabbage"
"abb"
;;
let%test_unit _ = should_match_unit (times (string "hello") 0) ""
let%test_unit _ =
should_match_string
(repeat (map ~f:(fun _ -> ()) (capture (string "x"))) *> capture (string "y"))
"xxy"
"y"
;;
let start_of_input = of_captureless_string "^"
let%test_unit _ = should_match_unit (start_of_input *> string "blah") "blahblee"
let%test_unit _ = should_not_match (start_of_input *> string "blah") "bloblahba"
let end_of_input = of_captureless_string "$"
let%test_unit _ = should_match_unit (string "blee" *> end_of_input) "blahblee"
let%test_unit _ = should_not_match (string "blah" *> end_of_input) "bloblahba"
let%test_unit _ =
should_match
[%sexp_of: (unit option * unit option) * string]
(and_capture
(both
(optional (string "a") <* start_of_input <* string "b")
(end_of_input *> optional (string "c"))))
"b"
((None, None), "b")
;;
let%test_unit _ =
should_match_string
(or_ [ start_of_input *> capture (string "a"); capture (string "b") ])
"ba"
"b"
;;
let of_re2 r =
let regex_string = Regex.pattern r in
let num_submatches = Regex.num_submatches r - 1 in
{ regex_string = Rope.(of_string "(?:" ^ of_string regex_string ^ of_string ")")
; num_submatches
; to_result = (fun shift matches -> Array.sub matches ~pos:shift ~len:num_submatches)
}
;;
let%test_module _ =
(module struct
let mk s = of_re2 (Regex.create_exn s)
let%test_unit _ =
let r = mk "a(b)(?:c([de])|(?P<foo>f)g)" in
should_match
[%sexp_of: string option array]
r
"abcd"
[| Some "b"; Some "d"; None |];
should_match
[%sexp_of: string option array list]
(all [ r; r; r ])
"abcdabfgabce"
[ [| Some "b"; Some "d"; None |]
; [| Some "b"; None; Some "f" |]
; [| Some "b"; Some "e"; None |]
]
;;
let%test_unit "messing with options" =
should_match_unit (ignore_m (mk "abc(?i)def")) "abcDEF";
match_only_if_case_insensitive
sexp_of_string
(capture (string "abc" *> ignore_m (mk "(?i)") *> string "def"))
"abcDEF"
"abcDEF";
should_not_match (mk "(?-i)abcdef") "abcDEF"
;;
end)
;;
let%test_unit _ =
let r = of_re2 (Regex.create_exn "a|b") in
let rs =
[ start_of_input *> ignore_m (r <* string "x") <* end_of_input
; start_of_input *> ignore_m (capture (ignore_m (r <* string "x"))) <* end_of_input
]
in
List.iter rs ~f:(fun r ->
should_match_unit r "ax";
should_match_unit r "bx";
should_not_match r "axq";
should_not_match r "qbx")
;;
module Char = struct
let capture_char t = map (capture t) ~f:(fun s -> s.[0])
let c r = capture_char (of_captureless_string r)
let upper = c "[[:upper:]]"
let lower = c "[[:lower:]]"
let alpha = c "[[:alpha:]]"
let digit = c "[0-9]"
let alnum = c "[[:alnum:]]"
let space = c "[[:space:]]"
let any = c "."
let%test_module _ =
(module struct
let all_chars = List.init (Char.to_int Char.max_value + 1) ~f:Char.of_int_exn
let matches_pred regex pred =
List.iter all_chars ~f:(fun c ->
if pred c
then
should_match_with_case
~case_sensitive:true
sexp_of_char
regex
(String.of_char c)
c
else
should_not_match_with_case ~case_sensitive:true regex (String.of_char c))
;;
let%test_unit _ = matches_pred upper Char.is_uppercase
let%test_unit _ = matches_pred lower Char.is_lowercase
let%test_unit _ = matches_pred alpha Char.is_alpha
let%test_unit _ = matches_pred digit Char.is_digit
let%test_unit _ = matches_pred alnum Char.is_alphanum
let%test_unit _ = matches_pred space Char.is_whitespace
let%test_unit _ = matches_pred any (Fn.const true)
end)
;;
let char_list_to_regex_string chars = Regex.escape (String.of_char_list chars)
let one_of = function
| [] -> fail
| [ x ] -> capture_char (string (String.of_char x))
| chars ->
capture_char
(of_captureless_string ("[" ^ char_list_to_regex_string chars ^ "]"))
;;
let not_one_of = function
| [] -> any
| chars ->
capture_char
(of_captureless_string ("[^" ^ char_list_to_regex_string chars ^ "]"))
;;
let%test_module _ =
(module struct
let should_match_char = should_match sexp_of_char
let%test_unit _ =
should_match_char (one_of [ '\xe2'; '\x82'; '\xac' ]) "\x82" '\x82'
;;
let%test_unit _ = should_match_char (one_of [ 'x'; 'x' ]) "x" 'x'
let%test_unit _ = should_not_match (one_of []) "x"
let%test_unit _ = should_match_char (or_ [ one_of []; one_of [ 'x' ] ]) "x" 'x'
let%test_unit _ = should_match_char (one_of [ '0'; '-'; '9' ]) "-" '-'
let%test_unit _ = should_not_match (one_of [ '0'; '-'; '9' ]) "5"
let%test_unit _ =
let difficult_char = one_of [ '^'; '['; ']' ] in
let r = all [ difficult_char; difficult_char; difficult_char ] in
should_match [%sexp_of: char list] r "^[]" [ '^'; '['; ']' ];
should_not_match r "]]x"
;;
let%test_unit _ = should_not_match (one_of [ '^'; ']' ]) "\\"
let%test_unit _ = should_match_char (one_of [ '\\'; 'n' ]) "n" 'n'
let%test_unit _ = should_match_char (one_of [ 'x'; '\\' ]) "\\" '\\'
let%test_unit _ = should_not_match (one_of [ '.' ]) "a"
let%test_unit _ =
should_match_string
(capture (ignore_m (all [ any; one_of [ '^' ]; any ])))
"a^c"
"a^c"
;;
let%test_unit _ = should_not_match (not_one_of [ 'x' ]) "x"
let%test_unit _ = should_match_char (not_one_of [ ']' ]) "x" 'x'
let%test_unit _ = should_match_char (one_of [ '\000' ]) "\000" '\000'
let%test_unit _ = should_match_char (one_of [ 'a'; '\000'; 'b' ]) "b" 'b'
let%test_unit _ =
let difficult_char = not_one_of [ '^'; '['; ']' ] in
let r = both difficult_char difficult_char in
should_match [%sexp_of: char * char] r "ab" ('a', 'b');
should_not_match r "a^"
;;
end)
;;
end
module Decimal = struct
let digit = map Char.digit ~f:(fun c -> Int.of_string (String.of_char c))
let sign =
map
(optional (Char.one_of [ '+'; '-' ]))
~f:(function
| None | Some '+' -> 1
| Some '-' -> -1
| Some c ->
failwiths ~here:[%here] "matched unexpected character" c [%sexp_of: char])
;;
let unsigned = map (capture (repeat ~min:1 Char.digit)) ~f:Int.of_string
let int = map2 sign unsigned ~f:( * )
let%test_unit "Parsing an empty string shouldn't raise" =
run int "" |> Core_kernel.ignore
;;
let%test_unit _ = should_not_match int ""
let%test_unit _ = should_match Int.sexp_of_t int "-10" (-10)
let%test_unit _ = should_match Int.sexp_of_t int "+005" 5
let%test_unit _ = should_match Int.sexp_of_t int "42" 42
end
let any_string = capture (repeat (ignore_m Char.any))
let%bench_module "big regex" =
(module struct
let big_regex_benchmark n =
let regex =
compile
(Fn.apply_n_times
~n
(fun x -> map (or_ [ x; capture (string "boo") ]) ~f:(fun x -> x))
any_string)
in
fun () ->
[%test_result: string option]
(Staged.unstage regex (String.make n 'x'))
~expect:(Some (String.make n 'x'))
;;
let%bench_fun ("compilation"[@indexed n = [ 500; 1000; 2000; 10000 ]]) =
fun () ->
let (_ : unit -> unit) = big_regex_benchmark n in
()
;;
let%bench_fun ("matching only"[@indexed n = [ 500; 1000; 2000 ]]) =
big_regex_benchmark n
;;
end)
;;
end
include Body
module Open_on_rhs_intf = struct
module type S = S with type 'a t = 'a t
end
include Applicative.Make_let_syntax (Body) (Open_on_rhs_intf) (Body)