Celestin Apprentice 5/Apprentice-Release5.iso/Environments/SmallEiffel 0.3.3/SmallEiffel PPC/lib_std/std_file_write.e

Text File | 1996-06-13 | 3.8 KB | 197 lines | [TEXT/EDIT]

-- Part of SmallEiffel -- Read DISCLAIMER file -- Copyright (C)
-- Dominique COLNET and Suzanne COLLIN -- [e-mail]
--
class STD_FILE_WRITE
--
-- Basic output facilities to write a named file on the disk.
--
-- Note : most features are common with STD_OUTPUT so you can
--        test your program first on the screen and then, changing
--        of instance (STD_OUTPUT/STD_FILE_WRITE), doing the same
--        on a file.
--

inherit STD_FILE

creation connect_to

feature

   connect_to(new_path: STRING) is
      do
     mode := "w";
     output_stream := fopen(new_path,mode);
     if output_stream /= Void then
        path := new_path;
     end;
      end;

   disconnect is
      local
     err: INTEGER;
      do
     err := fclose(output_stream);
     path := Void;
      end;

feature

   put_character(c: CHARACTER) is
      local
     err: CHARACTER;
      do
     err := fputc(c,output_stream);
     if err /= c then
        std_error.put_string("Error while writing character.");
        crash;
     end;
      end;

   put_string(s: STRING) is
     -- Output `s' to current output device.
      require
     s /= Void;
      local
     i: INTEGER;
      do
     from
        i := 1;
     until
        i > s.count
     loop
        put_character(s.item(i));
        i := i + 1;
     end;
      end;

   put_integer (i: INTEGER) is
     -- Output `i' to current output device.
      do
     tmp_string.clear;
     i.append_in(tmp_string);
     put_string(tmp_string);
      end;

   put_integer_format(i, s: INTEGER) is
     -- Output `i' to current output device using at most
     -- `s' character.
      do
     tmp_string.clear;
     i.append_in_format(tmp_string,s);
     put_string(tmp_string);
      end;

   put_real(r: REAL) is
     -- Output `r' to current output device.
      do
     tmp_string.clear;
     r.append_in(tmp_string);
     put_string(tmp_string);
      end;

   put_real_format(r: REAL; f: INTEGER) is
     -- Output `r' with only `f' digit for the fractionnal part.
     -- Examples:
     --    put_real(3.519,2) print "3.51".
      require
     f >= 0;
      do
     tmp_string.clear;
     r.append_in_format(tmp_string,f);
     put_string(tmp_string);
      end;

   put_double(d: DOUBLE) is
     -- Output `d' to current output device.
      do
     tmp_string.clear;
     d.append_in(tmp_string);
     put_string(tmp_string);
      end;

   put_double_format(d: DOUBLE; f: INTEGER) is
     -- Output `d' with only `f' digit for the fractionnal part.
     -- Examples:
     --    put_double(3.519,2) print "3.51".
      require
     f >= 0;
      do
     tmp_string.clear;
     r.append_in_format(tmp_string,f);
     put_string(tmp_string);
      end;

   put_boolean(b: BOOLEAN) is
     -- Output `b' to current output device according
     -- to the Eiffel format.
      do
     if b then
        put_string("true");
     else
        put_string("false");
     end;
      end;

   put_new_line is
     -- Output a newline character.
      do
     put_character('%N');
      end;

   put_spaces(nb: INTEGER) is
      -- Output `nb' spaces character.
      require
     nb >= 0;
      local
     count : INTEGER;
      do
     from
     until
        count >= nb
     loop
        put_character(' ');
        count := count + 1;
     end;
      end;

   append_file(file_name: STRING) is
      require
     file_exists(file_name);
      local
     c: CHARACTER;
      do
     tmp_file_read.connect_to(file_name);
     from
        tmp_file_read.read_character;
     until
        tmp_file_read.end_of_input
     loop
        c := tmp_file_read.last_character;
        put_character(c);
        tmp_file_read.read_character;
     end;
     tmp_file_read.disconnect;
      end;

feature {NONE}

   tmp_file_read: STD_FILE_READ is
      once
     !!Result.make;
      end;

feature {NONE}
   --
   -- NOTE: use only a few basic ANSI C functions.
   -- Try to use as few external C calls as possible.
   --

   output_stream: POINTER;

   tmp_string: STRING is
      once
     !!Result.make(512);
      end;

end -- STD_FILE_WRITE