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-- CXA4013.A

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--*

--

-- OBJECTIVE:

--      Check that the subprograms defined in package Ada.Strings.Wide_Fixed

--      are available, and that they produce correct results.  Specifically,

--      check the subprograms Index, "*" (Wide_String constructor function),

--      Count, Trim, and Replace_Slice.

--

-- TEST DESCRIPTION:

--      This test demonstrates how certain Wide_Fixed string functions

--      are used to eliminate specific substrings from portions of text.

--      A procedure is defined that will take as parameters a source

--      Wide_String along with a substring that is to be completely removed

--      from the source string.  The source Wide_String is parsed using the

--      Index function, and any substring slices are replaced in the source

--      Wide_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.Wide_Fixed;

with Ada.Strings.Wide_Maps;

with Report;

procedure CXA4013 is

begin

   Report.Test ("CXA4013", "Check that the subprograms defined in package "  &

                           "Ada.Strings.Wide_Fixed are available, and that " &

                           "they produce correct results");

   Test_Block:

   declare

      TC_Total        : Natural  := 0;

      Number_Of_Lines : constant := 3;

      WC              : Wide_Character :=

                          Wide_Character'Val(Character'Pos('X')            +

                                             Character'Pos(Character'Last) +

                                             1 );

      subtype WS is Wide_String (1..25);

      type Restricted_Words_Array_Type is

        array (1..10) of Wide_String (1..10);

      Restricted_Words : Restricted_Words_Array_Type :=

                           ("   platoon", " marines  ", "  Marines ",

                            "north     ", "south     ", "      east",

                            "  beach   ", "   airport", "airfield  ",

                            "     road ");

      type Page_Of_Text_Type is array (1..Number_Of_Lines) of WS;

      Text_Page : Page_Of_Text_Type := ("The platoon of Marines   ",

                                        "moved south on the south ",

                                        "road to the airfield.    ");

      TC_Revised_Line_1 : constant Wide_String := "The XXXXXXX of XXXXXXX   ";

      TC_Revised_Line_2 : constant Wide_String := "moved XXXXX on the XXXXX ";

      TC_Revised_Line_3 : constant Wide_String := "XXXX to the XXXXXXXX.    ";

      function Equivalent (Left : WS;  Right : Wide_String)

        return Boolean is

      begin

         for i in WS'range loop

            if Left(i) /= Right(i) then

               if Left(i) /= WC   or  Right(i) /= 'X' then

                  return False;

               end if;

            end if;

         end loop;

         return True;

      end Equivalent;

      ---

      procedure Censor (Source_String  : in out Wide_String;

                        Pattern_String : in     Wide_String) is

         use Ada.Strings.Wide_Fixed; -- allows infix notation of "*" below.

         -- Create a replacement string that is the same length as the

         -- pattern string being removed.  Use the infix notation of the

         -- wide string constructor function.

         Replacement : constant Wide_String :=

                         Pattern_String'Length * WC;                 -- "*"

         Going     : Ada.Strings.Direction := Ada.Strings.Forward;

         Start_Pos,

         Index     : Natural := Source_String'First;

      begin  -- Censor

         -- Accumulate count of total replacement operations.

         TC_Total := TC_Total +

                      Ada.Strings.Wide_Fixed.Count                  -- Count

                        (Source  => Source_String,

                         Pattern => Pattern_String,

                         Mapping => Ada.Strings.Wide_Maps.Identity);

         loop

            Index := Ada.Strings.Wide_Fixed.Index                   -- Index

                       (Source_String(Start_Pos..Source_String'Last),

                        Pattern_String,

                        Going,

                        Ada.Strings.Wide_Maps.Identity);

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

            -- if a match was found, modify the substring.

            Ada.Strings.Wide_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),                                 -- Trim

                     Ada.Strings.Wide_Fixed.Trim(Restricted_Words(Word),

                                                 Ada.Strings.Both));

         end loop;

      end loop;

      -- Validate results.

      if TC_Total /= 6 then

         Report.Failed ("Incorrect number of substitutions performed");

      end if;

      if not Equivalent (Text_Page(1), TC_Revised_Line_1) then

         Report.Failed ("Incorrect substitutions on Line 1");

      end if;

      if not Equivalent (Text_Page(2), TC_Revised_Line_2) then

         Report.Failed ("Incorrect substitutions on Line 2");

      end if;

      if not Equivalent (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 CXA4013;