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(* Js_of_ocaml compiler
* http://www.ocsigen.org/js_of_ocaml/
* Copyright (C) 2013 Hugo Heuzard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, with linking exception;
* either version 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*)
open! Stdlib
module Source_content = struct
type t = Sc_as_Stringlit of string
let create s = Sc_as_Stringlit (Yojson.Safe.to_string (`String s))
let of_stringlit (`Stringlit s) = Sc_as_Stringlit s
let to_json (Sc_as_Stringlit s) = `Stringlit s
end
type map =
| Gen of
{ gen_line : int
; gen_col : int
}
| Gen_Ori of
{ gen_line : int
; gen_col : int
; ori_source : int
; ori_line : int
; ori_col : int
}
| Gen_Ori_Name of
{ gen_line : int
; gen_col : int
; ori_source : int
; ori_line : int
; ori_col : int
; ori_name : int
}
let gen_line = function
| Gen { gen_line; _ } | Gen_Ori { gen_line; _ } | Gen_Ori_Name { gen_line; _ } ->
gen_line
let gen_col = function
| Gen { gen_col; _ } | Gen_Ori { gen_col; _ } | Gen_Ori_Name { gen_col; _ } -> gen_col
module Offset = struct
type t =
{ gen_line : int
; gen_column : int
}
end
module Mappings = struct
type decoded = map list
type t = Uninterpreted of string [@@unboxed]
let empty = Uninterpreted ""
let of_string_unsafe : string -> t = fun s -> Uninterpreted s
let to_string : t -> string = fun (Uninterpreted s) -> s
let number_of_lines (Uninterpreted s) =
match s with
| "" -> 0
| _ ->
let c = ref 1 in
String.iter s ~f:(function
| ';' -> incr c
| _ -> ());
!c
let first_line (Uninterpreted s) =
let len = String.length s in
let rec loop i =
if i >= len
then i
else
match String.get s i with
| ';' -> loop (i + 1)
| _ -> i
in
loop 0
let encode' ~offset mapping =
match mapping with
| [] -> 0, empty
| _ ->
let a = Array.of_list mapping in
let len = Array.length a in
Array.stable_sort
~cmp:(fun t1 t2 ->
match compare (gen_line t1) (gen_line t2) with
| 0 -> compare (gen_col t1) (gen_col t2)
| n -> n)
a;
let buf = Buffer.create 1024 in
(* The binary format encodes lines starting at zero, but
[ori_line] and [gen_line] are 1 based. *)
let gen_line_r = ref 1 in
let gen_col_r = ref 0 in
let ori_source_r = ref 0 in
let ori_line_r = ref 1 in
let ori_col_r = ref 0 in
let ori_name_r = ref 0 in
let rec loop prev i =
if i < len
then
let c = a.(i) in
if i + 1 < len
&& gen_line c = gen_line a.(i + 1)
&& gen_col c = gen_col a.(i + 1)
then
(* Only keep one source location per generated location *)
loop prev (i + 1)
else (
if !gen_line_r <> gen_line c
then (
assert (!gen_line_r < gen_line c);
for _i = !gen_line_r to gen_line c - 1 do
Buffer.add_char buf ';'
done;
gen_col_r := 0;
gen_line_r := gen_line c)
else if i > 0
then Buffer.add_char buf ',';
let l =
match c with
| Gen { gen_line = _; gen_col } ->
let res = [ gen_col - !gen_col_r ] in
gen_col_r := gen_col;
res
| Gen_Ori { gen_line = _; gen_col; ori_source; ori_line; ori_col } ->
let res =
[ gen_col - !gen_col_r
; ori_source - !ori_source_r
; ori_line - !ori_line_r
; ori_col - !ori_col_r
]
in
gen_col_r := gen_col;
ori_col_r := ori_col;
ori_line_r := ori_line;
ori_source_r := ori_source;
res
| Gen_Ori_Name
{ gen_line = _; gen_col; ori_source; ori_line; ori_col; ori_name } ->
let res =
[ gen_col - !gen_col_r
; ori_source - !ori_source_r
; ori_line - !ori_line_r
; ori_col - !ori_col_r
; ori_name - !ori_name_r
]
in
gen_col_r := gen_col;
ori_col_r := ori_col;
ori_line_r := ori_line;
ori_source_r := ori_source;
ori_name_r := ori_name;
res
in
Vlq64.encode_l buf l;
loop i (i + 1))
in
let offset =
let first_line = gen_line a.(0) in
assert (first_line > 0);
if offset
then (
gen_line_r := first_line;
first_line - 1)
else 0
in
loop (-1) 0;
offset, Uninterpreted (Buffer.contents buf)
let encode mapping =
let gen_line, res = encode' ~offset:false mapping in
assert (gen_line = 0);
res
let encode_with_offset mapping =
let gen_line, res = encode' ~offset:true mapping in
{ Offset.gen_line; gen_column = 0 }, res
let decode_exn (Uninterpreted str) =
let total_len = String.length str in
let gen_col = ref 0 in
let ori_source = ref 0 in
let ori_line = ref 1 in
let ori_col = ref 0 in
let ori_name = ref 0 in
let rec readline line pos acc =
if pos >= total_len
then List.rev acc
else
let last = try String.index_from str pos ';' with Not_found -> total_len in
gen_col := 0;
let pos, acc =
if pos = last then pos + 1, acc else read_tokens line pos last acc
in
readline (succ line) pos acc
and read_tokens line start stop acc =
let last =
try min (String.index_from str start ',') stop with Not_found -> stop
in
let v = Vlq64.decode_l str ~pos:start ~len:(last - start) in
match v with
| [] -> last + 1, acc
| v ->
let v =
match v with
| [ g ] ->
gen_col := !gen_col + g;
Gen { gen_line = line; gen_col = !gen_col }
| [ g; os; ol; oc ] ->
gen_col := !gen_col + g;
ori_source := !ori_source + os;
ori_line := !ori_line + ol;
ori_col := !ori_col + oc;
Gen_Ori
{ gen_line = line
; gen_col = !gen_col
; ori_source = !ori_source
; ori_line = !ori_line
; ori_col = !ori_col
}
| [ g; os; ol; oc; on ] ->
gen_col := !gen_col + g;
ori_source := !ori_source + os;
ori_line := !ori_line + ol;
ori_col := !ori_col + oc;
ori_name := !ori_name + on;
Gen_Ori_Name
{ gen_line = line
; gen_col = !gen_col
; ori_source = !ori_source
; ori_line = !ori_line
; ori_col = !ori_col
; ori_name = !ori_name
}
| _ -> invalid_arg "Source_map.Mappings.decode_exn"
in
let acc = v :: acc in
if last = stop then last + 1, acc else read_tokens line (last + 1) stop acc
in
(* The binary format encodes lines starting at zero, but
[ori_line] and [gen_line] are 1 based. *)
readline 1 0 []
let invariant ~names:_ ~sources:_ (Uninterpreted str) =
(* We can't check much without decoding (which is expensive) *)
(* Just do very simple checks *)
if not
(String.for_all str ~f:(function
| ';' | ',' -> true
| x -> Vlq64.in_alphabet x))
then invalid_arg "Mappings.invariant"
end
let version_is_valid = function
| 3 -> true
| _ -> false
let rewrite_path path =
if Filename.is_relative path
then path
else
match Build_path_prefix_map.get_build_path_prefix_map () with
| Some map -> Build_path_prefix_map.rewrite map path
| None -> path
let invalid () = invalid_arg "Source_map.of_json"
let string_of_stringlit (`Stringlit s) =
match Yojson.Safe.from_string s with
| `String s -> s
| _ -> invalid ()
let int_of_intlit (`Intlit s) =
match Yojson.Safe.from_string s with
| `Int s -> s
| _ -> invalid ()
let stringlit name rest : [ `Stringlit of string ] option =
try
match List.assoc name rest with
| `Stringlit _ as s -> Some s
| `Null -> None
| _ -> invalid ()
with Not_found -> None
let list_stringlit name rest =
try
match List.assoc name rest with
| `List l ->
Some
(List.map l ~f:(function
| `Stringlit _ as s -> s
| _ -> invalid ()))
| _ -> invalid ()
with Not_found -> None
let list_stringlit_opt name rest =
try
match List.assoc name rest with
| `List l ->
Some
(List.map l ~f:(function
| `Stringlit _ as s -> Some s
| `Null -> None
| _ -> invalid ()))
| _ -> invalid ()
with Not_found -> None
let list_intlit name rest =
try
match List.assoc name rest with
| `List l ->
Some
(List.map l ~f:(function
| `Intlit _ as s -> s
| _ -> invalid ()))
| _ -> invalid ()
with Not_found -> None
module Standard = struct
type t =
{ version : int
; file : string option
; sourceroot : string option
; sources : string list
; sources_content : Source_content.t option list option
; names : string list
; mappings : Mappings.t
; ignore_list : string list
}
let empty ~inline_source_content =
{ version = 3
; file = None
; sourceroot = None
; sources = []
; sources_content = (if inline_source_content then Some [] else None)
; names = []
; mappings = Mappings.empty
; ignore_list = []
}
let maps ~sources_offset ~names_offset x =
match x with
| Gen _ -> x
| Gen_Ori { gen_line; gen_col; ori_source; ori_line; ori_col } ->
let ori_source = ori_source + sources_offset in
Gen_Ori { gen_line; gen_col; ori_source; ori_line; ori_col }
| Gen_Ori_Name { gen_line; gen_col; ori_source; ori_line; ori_col; ori_name } ->
let ori_source = ori_source + sources_offset in
let ori_name = ori_name + names_offset in
Gen_Ori_Name { gen_line; gen_col; ori_source; ori_line; ori_col; ori_name }
let filter_map sm ~f =
let a = Array.of_list (Mappings.decode_exn sm.mappings) in
Array.stable_sort
~cmp:(fun t1 t2 ->
match compare (gen_line t1) (gen_line t2) with
| 0 -> compare (gen_col t1) (gen_col t2)
| n -> n)
a;
let l = Array.to_list a |> List.group ~f:(fun a b -> gen_line a = gen_line b) in
let rec loop acc mapping =
match mapping with
| [] -> List.rev acc
| x :: xs ->
let gen_line = gen_line (List.hd x) in
let acc =
match f gen_line with
| None -> acc
| Some gen_line ->
List.rev_append_map
x
~f:(function
| Gen { gen_line = _; gen_col } -> Gen { gen_line; gen_col }
| Gen_Ori { gen_line = _; gen_col; ori_source; ori_line; ori_col } ->
Gen_Ori { gen_line; gen_col; ori_source; ori_line; ori_col }
| Gen_Ori_Name
{ gen_line = _; gen_col; ori_source; ori_line; ori_col; ori_name }
->
Gen_Ori_Name
{ gen_line; gen_col; ori_source; ori_line; ori_col; ori_name })
acc
in
loop acc xs
in
let mappings = loop [] l in
{ sm with mappings = Mappings.encode mappings }
let merge = function
| [] -> None
| _ :: _ as l ->
let rec loop acc_rev mappings_rev ~sources_offset ~names_offset l =
match l with
| [] -> acc_rev, mappings_rev
| sm :: rest ->
let acc_rev, mappings_rev =
( { acc_rev with
sources = List.rev_append sm.sources acc_rev.sources
; names = List.rev_append sm.names acc_rev.names
; sources_content =
(match acc_rev.sources_content with
| Some acc_rev ->
let contents =
match sm.sources_content with
| Some x ->
assert (List.length x = List.length sm.sources);
x
| None -> List.map sm.sources ~f:(fun _ -> None)
in
Some (List.rev_append contents acc_rev)
| None -> None)
; mappings = Mappings.empty
}
, List.rev_append_map
~f:(maps ~sources_offset ~names_offset)
(Mappings.decode_exn sm.mappings)
mappings_rev )
in
loop
acc_rev
mappings_rev
~sources_offset:(sources_offset + List.length sm.sources)
~names_offset:(names_offset + List.length sm.names)
rest
in
let acc_rev, mappings_rev =
loop (empty ~inline_source_content:true) [] ~sources_offset:0 ~names_offset:0 l
in
Some
{ acc_rev with
mappings = Mappings.encode (List.rev mappings_rev)
; sources = List.rev acc_rev.sources
; names = List.rev acc_rev.names
; sources_content = Option.map ~f:List.rev acc_rev.sources_content
}
let json t =
let stringlit s = `Stringlit (Yojson.Safe.to_string (`String s)) in
`Assoc
(List.filter_map
~f:(fun (name, v) ->
match v with
| None -> None
| Some v -> Some (name, v))
[ "version", Some (`Intlit (string_of_int t.version))
; ( "file"
, match t.file with
| None -> None
| Some file -> Some (stringlit (rewrite_path file)) )
; ( "sourceRoot"
, match t.sourceroot with
| None -> None
| Some s -> Some (stringlit (rewrite_path s)) )
; "names", Some (`List (List.map t.names ~f:(fun s -> stringlit s)))
; ( "sources"
, Some (`List (List.map t.sources ~f:(fun s -> stringlit (rewrite_path s)))) )
; "mappings", Some (stringlit (Mappings.to_string t.mappings))
; ( "sourcesContent"
, match t.sources_content with
| None -> None
| Some l ->
Some
(`List
(List.map l ~f:(function
| None -> `Null
| Some x -> Source_content.to_json x))) )
; ( "ignoreList"
, match t.ignore_list with
| [] -> None
| _ ->
Some
(`List
(let s = StringSet.of_list t.ignore_list in
List.filter_map
~f:(fun x -> x)
(List.mapi
~f:(fun i nm ->
if StringSet.mem nm s
then Some (`Intlit (string_of_int i))
else None)
t.sources))) )
])
let of_json (json : Yojson.Raw.t) =
match json with
| `Assoc (("version", `Intlit version) :: rest)
when version_is_valid (int_of_string version) ->
let string name json = Option.map ~f:string_of_stringlit (stringlit name json) in
let file = string "file" rest in
let sourceroot = string "sourceRoot" rest in
let names =
match list_stringlit "names" rest with
| None -> []
| Some l -> List.map ~f:string_of_stringlit l
in
let sources =
match list_stringlit "sources" rest with
| None -> []
| Some l -> List.map ~f:string_of_stringlit l
in
let sources_content =
match list_stringlit_opt "sourcesContent" rest with
| None -> None
| Some l ->
Some
(List.map l ~f:(function
| None -> None
| Some s -> Some (Source_content.of_stringlit s)))
in
let mappings =
match string "mappings" rest with
| None -> Mappings.empty
| Some s -> Mappings.of_string_unsafe s
in
let ignore_list =
let s =
IntSet.of_list
(List.map
~f:int_of_intlit
(Option.value ~default:[] (list_intlit "ignoreList" rest)))
in
List.filter_map
~f:(fun x -> x)
(List.mapi ~f:(fun i nm -> if IntSet.mem i s then Some nm else None) sources)
in
{ version = int_of_string version
; file
; sourceroot
; names
; sources_content
; sources
; mappings
; ignore_list
}
| _ -> invalid ()
let to_string m = Yojson.Raw.to_string (json m)
let to_file m file = Yojson.Raw.to_file file (json m)
let invariant
{ version
; file = _
; sourceroot = _
; names
; sources_content
; sources
; mappings
; ignore_list
} =
if not (version_is_valid version)
then invalid_arg "Source_map.Standard.invariant: invalid version";
(if not (List.is_empty ignore_list)
then
let s = StringSet.of_list sources in
if List.exists ~f:(fun nm -> not (StringSet.mem nm s)) ignore_list
then
invalid_arg
"Source_map.Standard.invariant: ignore list should be a subset of sources");
match sources_content with
| None -> ()
| Some x ->
if not (List.length sources = List.length x)
then
invalid_arg
"Source_map.Standard.invariant: sources and sourcesContent must have the \
same size";
Mappings.invariant ~names ~sources mappings
end
module Index = struct
type section =
{ offset : Offset.t
; map : Standard.t
}
type t =
{ version : int
; file : string option
; sections : section list
}
let json t =
let stringlit s = `Stringlit (Yojson.Safe.to_string (`String s)) in
`Assoc
(List.filter_map
~f:(fun (name, v) ->
match v with
| None -> None
| Some v -> Some (name, v))
[ "version", Some (`Intlit (string_of_int t.version))
; ( "file"
, match t.file with
| None -> None
| Some file -> Some (stringlit (rewrite_path file)) )
; ( "sections"
, Some
(`List
(List.map
~f:(fun { offset = { gen_line; gen_column }; map } ->
`Assoc
[ ( "offset"
, `Assoc
[ "line", `Intlit (string_of_int gen_line)
; "column", `Intlit (string_of_int gen_column)
] )
; "map", Standard.json map
])
t.sections)) )
])
let intlit ~errmsg name json =
match List.assoc name json with
| `Intlit i -> int_of_string i
| _ -> invalid_arg errmsg
| exception Not_found -> invalid_arg errmsg
let section_of_json : Yojson.Raw.t -> section = function
| `Assoc json ->
let offset =
match List.assoc "offset" json with
| `Assoc fields ->
let gen_line =
intlit
"line"
fields
~errmsg:
"Source_map.Index.of_json: field 'line' absent or invalid from \
section"
in
let gen_column =
intlit
"column"
fields
~errmsg:
"Source_map.Index.of_json: field 'column' absent or invalid from \
section"
in
{ Offset.gen_line; gen_column }
| _ -> invalid_arg "Source_map.Index.of_json: 'offset' field of unexpected type"
in
(match List.assoc "url" json with
| _ ->
invalid_arg
"Source_map.Index.of_json: URLs in index maps are not currently supported"
| exception Not_found -> ());
let map =
try Standard.of_json (List.assoc "map" json) with
| Not_found -> invalid_arg "Source_map.Index.of_json: field 'map' absent"
| Invalid_argument _ ->
invalid_arg "Source_map.Index.of_json: invalid sub-map object"
in
{ offset; map }
| _ -> invalid_arg "Source_map.Index.of_json: section of unexpected type"
let of_json = function
| `Assoc (("version", `Intlit version) :: fields)
when version_is_valid (int_of_string version) -> (
let string name json = Option.map ~f:string_of_stringlit (stringlit name json) in
let file = string "file" fields in
match List.assoc "sections" fields with
| `List sections ->
let sections = List.map ~f:section_of_json sections in
{ version = int_of_string version; file; sections }
| _ -> invalid_arg "Source_map.Index.of_json: `sections` is not an array"
| exception Not_found ->
invalid_arg "Source_map.Index.of_json: no `sections` field")
| _ -> invalid_arg "Source_map.Index.of_json"
let to_string m = Yojson.Raw.to_string (json m)
let to_file m file = Yojson.Raw.to_file file (json m)
let invariant { version; file = _; sections } =
if not (version_is_valid version)
then invalid_arg "Source_map.Index.invariant: invalid version";
let _ : int =
List.fold_left
sections
~init:(-1)
~f:(fun acc { offset = { gen_line; gen_column }; map } ->
if gen_line < 0 || gen_column < 0
then invalid_arg "Source_map.Index.invariant: invalid offset";
if acc >= gen_line
then
invalid_arg
"Source_map.Index.invariant: overlapping or unordered map in sections";
Standard.invariant map;
gen_line + Mappings.number_of_lines map.mappings)
in
()
end
type t =
| Standard of Standard.t
| Index of Index.t
let of_json = function
| `Assoc fields as json -> (
match List.assoc "sections" fields with
| _ -> Index (Index.of_json json)
| exception Not_found -> Standard (Standard.of_json json))
| _ -> invalid_arg "Source_map.of_json: map is not an object"
let of_string s = of_json (Yojson.Raw.from_string s)
let of_file f = of_json (Yojson.Raw.from_file f)
let to_string = function
| Standard m -> Standard.to_string m
| Index i -> Index.to_string i
let to_file x f =
match x with
| Standard m -> Standard.to_file m f
| Index i -> Index.to_file i f
let invariant = function
| Standard m -> Standard.invariant m
| Index i -> Index.invariant i
type info =
{ mappings : Mappings.decoded
; sources : string list
; names : string list
}
|