package js_of_ocaml-compiler
Compiler from OCaml bytecode to JavaScript
Install
Dune Dependency
Authors
Maintainers
Sources
js_of_ocaml-5.1.1.tbz
sha256=0feb4418d2e491d50f3cffd0f7bc94c8ac02531149a467d8966f89581f7e5ede
sha512=8e031336678dd0ebb53bc5460c123538e4a968153f8b724dab1520f98fce1e105f9dc287a6576644d527bfafc181d4d071f25cc73240ff1b512c3cccdc864fe2
doc/src/js_of_ocaml-compiler/build_path_prefix_map.ml.html
Source file build_path_prefix_map.ml
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(**************************************************************************) (* *) (* OCaml *) (* *) (* Gabriel Scherer, projet Parsifal, INRIA Saclay *) (* *) (* Copyright 2017 Institut National de Recherche en Informatique et *) (* en Automatique. *) (* *) (* All rights reserved. This file is distributed under the terms of *) (* the GNU Lesser General Public License version 2.1, with the *) (* special exception on linking described in the file LICENSE. *) (* *) (**************************************************************************) open! Stdlib type path = string type path_prefix = string type error_message = string type ('a, 'b) result = | Ok of 'a | Error of 'b let errorf fmt = Printf.ksprintf (fun err -> Error err) fmt let encode_prefix str = let buf = Buffer.create (String.length str) in let push_char = function | '%' -> Buffer.add_string buf "%#" | '=' -> Buffer.add_string buf "%+" | ':' -> Buffer.add_string buf "%." | c -> Buffer.add_char buf c in String.iter ~f:push_char str; Buffer.contents buf let decode_prefix str = let buf = Buffer.create (String.length str) in let rec loop i = if i >= String.length str then Ok (Buffer.contents buf) else match str.[i] with | ('=' | ':') as c -> errorf "invalid character '%c' in key or value" c | '%' -> ( let push c = Buffer.add_char buf c; loop (i + 2) in if i + 1 = String.length str then errorf "invalid encoded string %S (trailing '%%')" str else match str.[i + 1] with | '#' -> push '%' | '+' -> push '=' | '.' -> push ':' | c -> errorf "invalid %%-escaped character '%c'" c) | c -> Buffer.add_char buf c; loop (i + 1) in loop 0 type pair = { target : path_prefix ; source : path_prefix } let encode_pair { target; source } = String.concat ~sep:"=" [ encode_prefix target; encode_prefix source ] let decode_pair str = match String.lsplit2 str ~on:'=' with | None -> errorf "invalid key/value pair %S, no '=' separator" str | Some (encoded_target, encoded_source) -> ( match decode_prefix encoded_target, decode_prefix encoded_source with | Ok target, Ok source -> Ok { target; source } | (Error _ as err), _ | _, (Error _ as err) -> err) type map = pair option list let encode_map map = let encode_elem = function | None -> "" | Some pair -> encode_pair pair in List.map ~f:encode_elem map |> String.concat ~sep:":" exception Shortcut of error_message let decode_map str = let decode_or_empty = function | "" -> None | pair -> ( match decode_pair pair with | Ok str -> Some str | Error err -> raise (Shortcut err)) in let pairs = String.split_char ~sep:':' str in match List.map ~f:decode_or_empty pairs with | exception Shortcut err -> Error err | map -> Ok map let rewrite_opt prefix_map path = let is_prefix = function | None -> false | Some { target = _; source } -> String.is_prefix path ~prefix:source in match List.find ~f:is_prefix (* read key/value pairs from right to left, as the spec demands *) (List.rev prefix_map) with | exception Not_found -> None | None -> None | Some { source; target } -> Some (target ^ String.sub path ~pos:(String.length source) ~len:(String.length path - String.length source)) let rewrite prefix_map path = match rewrite_opt prefix_map path with | None -> path | Some path -> path let flip l = List.map l ~f:(Option.map ~f:(fun x -> { source = x.target; target = x.source })) (* copied from ocaml/utils/misc.ml *) let get_build_path_prefix_map = let init = ref false in let map_cache = ref None in fun () -> if not !init then ( init := true; match Sys.getenv "BUILD_PATH_PREFIX_MAP" with | exception Not_found -> () | encoded_map -> ( match decode_map encoded_map with | Error err -> failwith @@ Printf.sprintf "Invalid value for the environment variable BUILD_PATH_PREFIX_MAP: %s" err | Ok map -> map_cache := Some map)); !map_cache
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