gcc/ada/s-diflio.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                    S Y S T E M . D I M . F L O A T _ I O                 --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2011-2012, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package provides output routines for float dimensioned types. All Put
  33 --  routines are modelled after those in package Ada.Text_IO.Float_IO with the
  34 --  addition of an extra default parameter. All Put_Dim_Of routines
  35 --  output the dimension of Item in a symbolic manner.
  36
  37 --  Parameter Symbol may be used in the following manner (all the examples are
  38 --  based on the MKS system of units defined in package System.Dim.Mks):
  39
  40 --    type Mks_Type is new Long_Long_Float
  41 --      with
  42 --       Dimension_System => (
  43 --        (Unit_Name => Meter,    Unit_Symbol => 'm',   Dim_Symbol => 'L'),
  44 --        (Unit_Name => Kilogram, Unit_Symbol => "kg",  Dim_Symbol => 'M'),
  45 --        (Unit_Name => Second,   Unit_Symbol => 's',   Dim_Symbol => 'T'),
  46 --        (Unit_Name => Ampere,   Unit_Symbol => 'A',   Dim_Symbol => 'I'),
  47 --        (Unit_Name => Kelvin,   Unit_Symbol => 'K',   Dim_Symbol => "Θ"),
  48 --        (Unit_Name => Mole,     Unit_Symbol => "mol", Dim_Symbol => 'N'),
  49 --        (Unit_Name => Candela,  Unit_Symbol => "cd",  Dim_Symbol => 'J'));
  50
  51 --  Case 1. A value is supplied for Symbol
  52
  53 --   * Put        : The string appears as a suffix of Item
  54
  55 --   * Put_Dim_Of : The string appears alone
  56
  57 --      Obj : Mks_Type := 2.6;
  58 --      Put (Obj, 1, 1, 0, " dimensionless");
  59 --      Put_Dim_Of (Obj, "dimensionless");
  60
  61 --      The corresponding outputs are:
  62 --      $2.6 dimensionless
  63 --      $dimensionless
  64
  65 --  Case 2. No value is supplied for Symbol and Item is dimensionless
  66
  67 --   * Put        : Item appears without a suffix
  68
  69 --   * Put_Dim_Of : the output is []
  70
  71 --      Obj : Mks_Type := 2.6;
  72 --      Put (Obj, 1, 1, 0);
  73 --      Put_Dim_Of (Obj);
  74
  75 --      The corresponding outputs are:
  76 --      $2.6
  77 --      $[]
  78
  79 --  Case 3. No value is supplied for Symbol and Item has a dimension
  80
  81 --   * Put        : If the type of Item is a dimensioned subtype whose
  82 --                  symbol is not empty, then the symbol appears as a suffix.
  83 --                  Otherwise, a new string is created and appears as a
  84 --                  suffix of Item. This string results in the successive
  85 --                  concatenations between each unit symbol raised by its
  86 --                  corresponding dimension power from the dimensions of Item.
  87
  88 --   * Put_Dim_Of : The output is a new string resulting in the successive
  89 --                  concatenations between each dimension symbol raised by its
  90 --                  corresponding dimension power from the dimensions of Item.
  91
  92 --      subtype Length is Mks_Type
  93 --        with
  94 --         Dimension => ('m',
  95 --           Meter =>  1,
  96 --           others => 0);
  97
  98 --      Obj : Length := 2.3 * dm;
  99 --      Put (Obj, 1, 2, 0);
 100 --      Put_Dim_Of (Obj);
 101
 102 --      The corresponding outputs are:
 103 --      $0.23 m
 104 --      $[L]
 105
 106 --      subtype Random is Mks_Type
 107 --        with
 108 --         Dimension => (
 109 --           Meter =>   3,
 110 --           Candela => -1,
 111 --           others =>  0);
 112
 113 --      Obj : Random := 5.0;
 114 --      Put (Obj);
 115 --      Put_Dim_Of (Obj);
 116
 117 --      The corresponding outputs are:
 118 --      $5.0 m**3.cd**(-1)
 119 --      $[l**3.J**(-1)]
 120
 121 --      Put (3.3 * km * dm * min, 5, 1, 0);
 122 --      Put_Dim_Of (3.3 * km * dm * min);
 123
 124 --      The corresponding outputs are:
 125 --      $19800.0 m**2.s
 126 --      $[L**2.T]
 127
 128 with Ada.Text_IO; use Ada.Text_IO;
 129
 130 generic
 131    type Num_Dim_Float is digits <>;
 132
 133 package System.Dim.Float_IO is
 134
 135    Default_Fore : Field := 2;
 136    Default_Aft  : Field := Num_Dim_Float'Digits - 1;
 137    Default_Exp  : Field := 3;
 138
 139    procedure Put
 140      (File   : File_Type;
 141       Item   : Num_Dim_Float;
 142       Fore   : Field  := Default_Fore;
 143       Aft    : Field  := Default_Aft;
 144       Exp    : Field  := Default_Exp;
 145       Symbol : String := "");
 146
 147    procedure Put
 148      (Item   : Num_Dim_Float;
 149       Fore   : Field  := Default_Fore;
 150       Aft    : Field  := Default_Aft;
 151       Exp    : Field  := Default_Exp;
 152       Symbol : String := "");
 153
 154    procedure Put
 155      (To     : out String;
 156       Item   : Num_Dim_Float;
 157       Aft    : Field  := Default_Aft;
 158       Exp    : Field  := Default_Exp;
 159       Symbol : String := "");
 160
 161    procedure Put_Dim_Of
 162      (File   : File_Type;
 163       Item   : Num_Dim_Float;
 164       Symbol : String := "");
 165
 166    procedure Put_Dim_Of
 167      (Item   : Num_Dim_Float;
 168       Symbol : String := "");
 169
 170    procedure Put_Dim_Of
 171      (To     : out String;
 172       Item   : Num_Dim_Float;
 173       Symbol : String := "");
 174
 175    pragma Inline (Put);
 176    pragma Inline (Put_Dim_Of);
 177
 178 end System.Dim.Float_IO;