--  -*- coding: utf-8 -*-
--
--  ZanyBlue, an Ada library and framework for finite element analysis.
--
--  Copyright (c) 2012, 2016, Michael Rohan <mrohan@zanyblue.com>
--  All rights reserved.
--
--  Redistribution and use in source and binary forms, with or without
--  modification, are permitted provided that the following conditions
--  are met:
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--    * Redistributions of source code must retain the above copyright
--      notice, this list of conditions and the following disclaimer.
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--    * Redistributions in binary form must reproduce the above copyright
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--      without specific prior written permission.
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--  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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--

with Ada.Wide_Characters.Unicode;

package body ZBTest.Input_Parser is

   use Ada.Wide_Characters.Unicode;

   -----------------
   -- Parse_Words --
   -----------------

   function Parse_Words
     (Line : String)
      return List_Type
   is
      type State_Type is (Space, Word, String, Comment);
      Result    : List_Type;
      State     : State_Type     := Space;
      End_Quote : Unicode_Character := '"';
      First     : Positive       := Line'First;
   begin
      for I in Line'Range loop
         case State is
            when Space =>
               if Line (I) = '"' or else Line (I) = ''' then
                  First     := I + 1;
                  State     := String;
                  End_Quote := Line (I);
               elsif Line (I) = '#' then
                  State := Comment;
               elsif not Is_Space (Line (I)) then
                  First := I;
                  State := Word;
               end if;
            when Word =>
               if Line (I) = '"' or else Line (I) = ''' then
                  Append (Result, Line (First .. I - 1));
                  First     := I + 1;
                  State     := String;
                  End_Quote := Line (I);
               elsif Is_Space (Line (I)) or else Line (I) = '#' then
                  Append (Result, Line (First .. I - 1));
                  if Line (I) = '#' then
                     State := Comment;
                  else
                     State := Space;
                  end if;
               end if;
            when String =>
               if Line (I) = End_Quote then
                  Append (Result, Line (First .. I - 1));
                  First := I + 1;
                  State := Space;
               end if;
            when Comment =>
               null;
         end case;
      end loop;
      case State is
         when Space | Comment =>
            null;
         when Word =>
            Append (Result, Line (First .. Line'Last));
         when String =>
            raise Unterminated_String;
      end case;
      return Result;
   end Parse_Words;

end ZBTest.Input_Parser;