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-- CXA4002.A
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--                                    DISCLAIMER
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--*
--
-- OBJECTIVE:
--      Check that the subprograms defined in package Ada.Strings.Fixed are
--      available, and that they produce correct results.  Specifically, 
--      check the subprograms Index, "*" (string constructor function), 
--      Count, Trim, and Replace_Slice.
--
-- TEST DESCRIPTION:
--      This test demonstrates how certain Fixed string functions are used
--      to eliminate specific substrings from portions of text.  A procedure
--      is defined that will take as parameters a source string along with
--      a substring that is to be completely removed from the source string.
--      The source string is parsed using the Index function, and any substring
--      slices are replaced in the source string by a series of X's (based on
--      the length of the substring.)  
--      Three lines of text are provided to this procedure, and the resulting
--      substitutions are compared with expected results to validate the 
--      string processing.
--      A global accumulator is updated with the number of occurrences of the
--      substring in the source string.  
--
--       
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--
--!

with Ada.Strings;
with Ada.Strings.Fixed;
with Ada.Strings.Maps;
with Report;

procedure CXA4002 is

begin

   Report.Test ("CXA4002", "Check that the subprograms defined in package "  &
                           "Ada.Strings.Fixed are available, and that "      &
                           "they produce correct results");

   Test_Block:
   declare

      TC_Total : Natural := 0;
      Number_Of_Lines : constant := 3;

      type Restricted_Words_Array_Type is array (1..10) of String (1..10);

      Restricted_Words : Restricted_Words_Array_Type := 
                           ("   platoon", " marines  ", "  Marines ",
                            "north     ", "south     ", "      east", 
                            "  beach   ", "   airport", "airfield  ", 
                            "     road ");

      subtype Line_Of_Text_Type is String(1..25);
      type    Page_Of_Text_Type is array (1..Number_Of_Lines) 
        of Line_Of_Text_Type;

      Text_Page : Page_Of_Text_Type := ("The platoon of Marines   ",
                                        "moved south on the south ",
                                        "road to the airfield.    ");

      TC_Revised_Line_1 : constant String := "The XXXXXXX of XXXXXXX   ";
      TC_Revised_Line_2 : constant String := "moved XXXXX on the XXXXX ";
      TC_Revised_Line_3 : constant String := "XXXX to the XXXXXXXX.    ";

      ---

      procedure Censor (Source_String  : in out String;
                        Pattern_String : in     String) is
                        
         -- Create a replacement string that is the same length as the
         -- pattern string being removed.
         Replacement : constant String :=                              -- "*"
                         Ada.Strings.Fixed."*"(Pattern_String'Length, 'X');

         Going       : Ada.Strings.Direction := Ada.Strings.Forward;
         Map         : constant Ada.Strings.Maps.Character_Mapping :=
                         Ada.Strings.Maps.Identity;
         Start_Pos,
         Index       : Natural := Source_String'First;


      begin  -- Censor

         -- Accumulate count of total replacement operations.

         TC_Total := TC_Total +                                     -- Count
                       Ada.Strings.Fixed.Count (Source  => Source_String,
                                                Pattern => Pattern_String,
                                                Mapping => Map);
         loop

            Index := Ada.Strings.Fixed.Index                        -- Index
                       (Source_String(Start_Pos..Source_String'Last),
                        Pattern_String, 
                        Going, 
                        Map);

            exit when Index = 0;   -- No matches, exit loop.

            -- if a match was found, modify the substring.
            Ada.Strings.Fixed.Replace_Slice                   -- Replace_Slice
                                (Source_String,
                                 Index,
                                 Index + Pattern_String'Length - 1,
                                 Replacement);
            Start_Pos := Index + Pattern_String'Length;

         end loop;

      end Censor;


   begin

      -- Invoke Censor subprogram to cleanse text.
      -- Loop through each line of text, and check for the presence of each
      -- restricted word.
      -- Use the Trim function to eliminate leading or trailing blanks from
      -- the restricted word parameters.

      for Line in 1..Number_Of_Lines loop
         for Word in Restricted_Words'Range loop
             Censor (Text_Page(Line), 
                     Ada.Strings.Fixed.Trim(Restricted_Words(Word),   -- Trim
                                            Ada.Strings.Both));
         end loop;
      end loop;


      -- Validate results.

      if TC_Total /= 6 then
         Report.Failed ("Incorrect number of substitutions performed");
      end if;

      if Text_Page(1) /= TC_Revised_Line_1 then
         Report.Failed ("Incorrect substitutions on Line 1");
      end if;

      if Text_Page(2) /= TC_Revised_Line_2 then
         Report.Failed ("Incorrect substitutions on Line 2");
      end if;

      if Text_Page(3) /= TC_Revised_Line_3 then
         Report.Failed ("Incorrect substitutions on Line 3");
      end if;


   exception
      when others => Report.Failed ("Exception raised in Test_Block");
   end Test_Block;


   Report.Result;

end CXA4002;