{
(***********************************************************************)
(*                             OCamldoc                                *)
(*                                                                     *)
(*            Maxence Guesdon, projet Cristal, INRIA Rocquencourt      *)
(*                                                                     *)
(*  Copyright 2001 Institut National de Recherche en Informatique et   *)
(*  en Automatique.  All rights reserved.  This file is distributed    *)
(*  under the terms of the Q Public License version 1.0.               *)
(*                                                                     *)
(***********************************************************************)

(* $Id$ *)

(** The lexer for special comments. *)

open Lexing
open Odoc_parser

let line_number = ref 0


let string_buffer = Buffer.create 32

(** Fonction de remise à zéro de la chaine de caractères tampon *)
let reset_string_buffer () = Buffer.reset string_buffer

(** Fonction d'ajout d'un caractère dans la chaine de caractères tampon *)
let ajout_char_string = Buffer.add_char string_buffer

(** Add a string to the buffer. *)
let ajout_string = Buffer.add_string string_buffer

let lecture_string () = Buffer.contents string_buffer

(** The variable which will contain the description string.
   Is initialized when we encounter the start of a special comment. *)
let description = ref ""

let blank = "[ \013\009\012]"

(** The nested comments level. *)
let comments_level = ref 0

let print_DEBUG2 s = print_string s; print_newline ()

(** This function returns the given string without the leading and trailing blanks.*)
let remove_blanks s =
  print_DEBUG2 ("remove_blanks "^s);
  let l = Str.split_delim (Str.regexp "\n") s in
  let l2 =
    let rec iter liste =
      match liste with
        h :: q ->
          let h2 = Str.global_replace (Str.regexp ("^"^blank^"+")) "" h in
          if h2 = "" then
            (
             print_DEBUG2 (h^" n'a que des blancs");
             (* we remove this line and must remove leading blanks of the next one *)
             iter q
            )
          else
            (* we don't remove leading blanks in the remaining lines *)
            h2 :: q
      | _ ->
          []
    in iter l
  in
  let l3 =
    let rec iter liste =
      match liste with
        h :: q ->
          let h2 = Str.global_replace (Str.regexp (blank^"+$")) "" h in
          if h2 = "" then
            (
             print_DEBUG2 (h^" n'a que des blancs");
             (* we remove this line and must remove trailing blanks of the next one *)
             iter q
            )
          else
            (* we don't remove trailing blanks in the remaining lines *)
            h2 :: q
      | _ ->
          []
    in
    List.rev (iter (List.rev l2))
  in
  String.concat "\n" l3

(** Remove first blank characters of each line of a string, until the first '*' *)
let remove_stars s =
  let s2 = Str.global_replace (Str.regexp ("^"^blank^"*\\*")) "" s in
  s2
}

let lowercase = ['a'-'z' '\223'-'\246' '\248'-'\255' '_']
let uppercase = ['A'-'Z' '\192'-'\214' '\216'-'\222']
let identchar =
  ['A'-'Z' 'a'-'z' '_' '\192'-'\214' '\216'-'\246' '\248'-'\255' '\'' '0'-'9']

rule main = parse
    [' ' '\013' '\009' '\012'] +
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        main lexbuf
      }

  | [ '\010' ]
      {
        incr line_number;
        incr Odoc_comments_global.nb_chars;
        main lexbuf
      }
  | "(**)"
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        Description ("", None)
      }

  | "(**"("*"+)")"
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        main lexbuf
      }

  | "(***"
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        incr comments_level;
        main lexbuf
      }

  | "(**"
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        incr comments_level;
        if !comments_level = 1 then
          (
           reset_string_buffer ();
           description := "";
           special_comment lexbuf
          )
        else
          main lexbuf
      }

  | eof
      { EOF }

  |  "*)"
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        decr comments_level ;
        main lexbuf
      }

  |  "(*"
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        incr comments_level ;
        main lexbuf
      }

  | _
      {
        incr Odoc_comments_global.nb_chars;
        main lexbuf
      }

and special_comment = parse
  | "*)"
      {
        let s = Lexing.lexeme lexbuf in
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length s);
        if !comments_level = 1 then
          (
           (* there is just a description *)
           let s2 = lecture_string () in
           let s3 = remove_blanks s2 in
           let s4 =
             if !Odoc_global.remove_stars then
               remove_stars s3
             else
               s3
           in
           Description (s4, None)
          )
        else
          (
           ajout_string s;
           decr comments_level;
           special_comment lexbuf
          )
      }

  |  "(*"
      {
        let s = Lexing.lexeme lexbuf in
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length s);
        incr comments_level ;
        ajout_string s;
        special_comment lexbuf
      }

  | "\\@"
      {
        let s = Lexing.lexeme lexbuf in
        let c = (Lexing.lexeme_char lexbuf 1) in
        ajout_char_string c;
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length s);
        special_comment lexbuf
      }

  | "@"lowercase+
      {
        (* we keep the description before we go further *)
        let s = lecture_string () in
        description := remove_blanks s;
        reset_string_buffer ();
        let len = String.length (Lexing.lexeme lexbuf) in
        lexbuf.Lexing.lex_curr_pos <- lexbuf.Lexing.lex_curr_pos - len;
        lexbuf.Lexing.lex_curr_p <-
          { lexbuf.Lexing.lex_curr_p with
            pos_cnum = lexbuf.Lexing.lex_curr_p.pos_cnum - len
          } ;
        (* we don't increment the Odoc_comments_global.nb_chars *)
        special_comment_part2 lexbuf
      }

  | _
      {
        let c = (Lexing.lexeme_char lexbuf 0) in
        ajout_char_string c;
        if c = '\010' then incr line_number;
        incr Odoc_comments_global.nb_chars;
        special_comment lexbuf
      }

and special_comment_part2 = parse
  | "*)"
      {
        let s = Lexing.lexeme lexbuf in
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length s);
        if !comments_level = 1 then
          (* finally we return the description we kept *)
          let desc =
            if !Odoc_global.remove_stars then
              remove_stars !description
             else
              !description
          in
          let remain = lecture_string () in
          let remain2 =
            if !Odoc_global.remove_stars then
              remove_stars remain
             else
               remain
          in
          Description (desc, Some remain2)
        else
          (
           ajout_string s ;
           decr comments_level ;
           special_comment_part2 lexbuf
          )
      }

  |  "(*"
      {
        let s = Lexing.lexeme lexbuf in
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length s);
        ajout_string s;
        incr comments_level ;
        special_comment_part2 lexbuf
      }

  | _
      {
        let c = (Lexing.lexeme_char lexbuf 0) in
        ajout_char_string c;
        if c = '\010' then incr line_number;
        incr Odoc_comments_global.nb_chars;
        special_comment_part2 lexbuf
      }

and elements = parse
  | [' ' '\013' '\009' '\012'] +
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        elements lexbuf
      }

  | [ '\010' ]
      { incr line_number;
        incr Odoc_comments_global.nb_chars;
        print_DEBUG2 "newline";
        elements lexbuf }

  | "@"lowercase+
      {
        let s = Lexing.lexeme lexbuf in
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length s);
        let s2 = String.sub s 1 ((String.length s) - 1) in
        print_DEBUG2 s2;
        match s2 with
          "param" ->
            T_PARAM
         | "author" ->
            T_AUTHOR
         | "version" ->
             T_VERSION
         | "see" ->
             T_SEE
         | "since" ->
             T_SINCE
         | "before" ->
             T_BEFORE
         | "deprecated" ->
             T_DEPRECATED
         | "raise" ->
             T_RAISES
         | "return" ->
             T_RETURN
         | s ->
             if !Odoc_global.no_custom_tags then
               raise (Failure (Odoc_messages.not_a_valid_tag s))
             else
               T_CUSTOM s
      }

  | ("\\@" | [^'@'])+
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        let s = Lexing.lexeme lexbuf in
        let s = Str.global_replace (Str.regexp_string "\\@") "@" s in
        let s = remove_blanks s in
        print_DEBUG2 ("Desc "^s);
        Desc s
      }
  | eof
      {
        EOF
      }


and simple = parse
    [' ' '\013' '\009' '\012'] +
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        simple lexbuf
      }

  | [ '\010' ]
      { incr line_number;
        incr Odoc_comments_global.nb_chars;
        simple lexbuf
      }

  | "(**"("*"+)
      {
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length (Lexing.lexeme lexbuf));
        incr comments_level;
        simple lexbuf
      }

  | "(*"("*"+)")"
      {
        let s = Lexing.lexeme lexbuf in
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length s);
        simple lexbuf
      }
  | "(**"
      {
        let s = Lexing.lexeme lexbuf in
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length s);
        incr comments_level;
        simple lexbuf
      }

  | "(*"
      {
        let s = Lexing.lexeme lexbuf in
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length s);
        incr comments_level;
        if !comments_level = 1 then
          (
           reset_string_buffer ();
           description := "";
           special_comment lexbuf
          )
        else
          (
           ajout_string s;
           simple lexbuf
          )
      }

  | eof
      { EOF }

  |  "*)"
      {
        let s = Lexing.lexeme lexbuf in
        Odoc_comments_global.nb_chars := !Odoc_comments_global.nb_chars + (String.length s);
        decr comments_level ;
        simple lexbuf
      }

  | _
      {
        incr Odoc_comments_global.nb_chars;
        simple lexbuf
      }