ext_namespace.ml

(* Copyright (C) 2015-2016 Bloomberg Finance L.P.
 * 
 * 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * In addition to the permissions granted to you by the LGPL, you may combine
 * or link a "work that uses the Library" with a publicly distributed version
 * of this file to produce a combined library or application, then distribute
 * that combined work under the terms of your choosing, with no requirement
 * to comply with the obligations normally placed on you by section 4 of the
 * LGPL version 3 (or the corresponding section of a later version of the LGPL
 * should you choose to use a 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. *)





let rec rindex_rec s i  =
  if i < 0 then i else
    let char = String.unsafe_get s i in
    if Ext_filename.is_dir_sep char  then -1 
    else if char = Literals.ns_sep_char then i 
    else
      rindex_rec s (i - 1) 

let change_ext_ns_suffix name ext =
  let i = rindex_rec name (String.length name - 1)  in 
  if i < 0 then name ^ ext
  else String.sub name 0 i ^ ext (* FIXME: micro-optimizaiton*)

let try_split_module_name name = 
  let len = String.length name in 
  let i = rindex_rec name (len - 1)  in 
  if i < 0 then None 
  else 
    Some (String.sub name (i+1) (len - i - 1),
          String.sub name 0 i )



  
(* let js_name_of_basename bs_suffix s =   
  change_ext_ns_suffix  s 
  (if bs_suffix then Literals.suffix_bs_js else  Literals.suffix_js ) *)

let js_name_of_modulename s (little : Ext_js_file_kind.t) : string = 
  match little with 
  | Little_js -> 
    change_ext_ns_suffix (Ext_string.uncapitalize_ascii s)  Literals.suffix_js
  | Little_bs -> 
    change_ext_ns_suffix (Ext_string.uncapitalize_ascii s)  Literals.suffix_bs_js
  | Upper_js ->
    change_ext_ns_suffix s  Literals.suffix_js
  | Upper_bs -> 
    change_ext_ns_suffix s  Literals.suffix_bs_js

(* https://docs.npmjs.com/files/package.json 
   Some rules:
   The name must be less than or equal to 214 characters. This includes the scope for scoped packages.
   The name can't start with a dot or an underscore.
   New packages must not have uppercase letters in the name.
   The name ends up being part of a URL, an argument on the command line, and a folder name. Therefore, the name can't contain any non-URL-safe characters.
*)
let is_valid_npm_package_name (s : string) = 
  let len = String.length s in 
  len <= 214 && (* magic number forced by npm *)
  len > 0 &&
  match String.unsafe_get s 0 with 
  | 'a' .. 'z' | '@' -> 
    Ext_string.for_all_from s 1 
      (fun x -> 
         match x with 
         |  'a'..'z' | '0'..'9' | '_' | '-' -> true
         | _ -> false )
  | _ -> false 


let namespace_of_package_name (s : string) : string = 
  let len = String.length s in 
  let buf = Ext_buffer.create len in 
  let add capital ch = 
    Ext_buffer.add_char buf 
      (if capital then 
         (Char.uppercase_ascii ch)
       else ch) in    
  let rec aux capital off len =     
    if off >= len then ()
    else 
      let ch = String.unsafe_get s off in
      match ch with 
      | 'a' .. 'z' 
      | 'A' .. 'Z' 
      | '0' .. '9'
      | '_'
        ->
        add capital ch ; 
        aux false (off + 1) len 
      | '/'
      | '-' -> 
        aux true (off + 1) len 
      | _ -> aux capital (off+1) len
  in 
  aux true 0 len ;
  Ext_buffer.contents buf