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1034 | with Ada.Containers.Hashed_Maps,
Ada.Numerics.Float_Random,
Ada.Numerics.Generic_Elementary_Functions,
Ada.Streams.Stream_IO,
Ada.Strings.Fixed,
Ada.Strings.Unbounded.Hash,
Ada.Text_IO.Text_Streams;
with Interfaces;
package body HAT is
package REF is new Ada.Numerics.Generic_Elementary_Functions (Real);
function "**" (F1, F2 : Real) return Real is
begin
return REF."**" (F1, F2);
end "**";
function Sqrt (I : Integer) return Real is
begin
return REF.Sqrt (Real (I));
end Sqrt;
function Sqrt (F : Real) return Real is
begin
return REF.Sqrt (F);
end Sqrt;
function Chr (I : Integer) return Character is
begin
return Character'Val (I);
end Chr;
function Ord (C : Character) return Integer is
begin
return Character'Pos (C);
end Ord;
function Succ (C : Character) return Character is
begin
return Character'Succ (C);
end Succ;
function Pred (C : Character) return Character is
begin
return Character'Pred (C);
end Pred;
function Round (F : Real) return Integer is
begin
return Integer (F);
end Round;
function Trunc (F : Real) return Integer is
begin
return Integer (Real'Floor (F));
end Trunc;
function Sin (F : Real) return Real is
begin
return REF.Sin (F);
end Sin;
function Cos (F : Real) return Real is
begin
return REF.Cos (F);
end Cos;
function Arctan (F : Real) return Real is
begin
return REF.Arctan (F);
end Arctan;
function Log (F : Real) return Real is
begin
return REF.Log (F);
end Log;
function Exp (F : Real) return Real is
begin
return REF.Exp (F);
end Exp;
function Sgn (I : Integer) return Integer is
begin
return (if I > 0 then 1 elsif I < 0 then -1 else 0);
end Sgn;
function Sgn (F : Real) return Real is
begin
return (if F > 0.0 then 1.0 elsif F < 0.0 then -1.0 else 0.0);
end Sgn;
function Rand (I : Integer) return Integer is
res : Integer;
begin
loop
res := Trunc (Rnd * Real (I + 1));
exit when res < I + 1; -- In extremely rare cases we have res = I + 1.
end loop;
return res;
end Rand;
gen : Ada.Numerics.Float_Random.Generator;
function Rnd return Real is
begin
return Real (Ada.Numerics.Float_Random.Random (gen));
end Rnd;
procedure Randomize is
begin
Ada.Numerics.Float_Random.Reset (gen);
end Randomize;
procedure Random_Seed (New_Seed : Positive) is
begin
Ada.Numerics.Float_Random.Reset (gen, New_Seed);
end Random_Seed;
function HAC_Image (I : Integer) return String is
Im : constant String := Integer'Image (I);
begin
-- Return image without leading ' ' on non-negative values.
return (if I < 0 then Im else Im (Im'First + 1 .. Im'Last));
end HAC_Image;
function HAC_Image (T : Ada.Calendar.Time) return String is
use Ada;
-- Time_display returns date & time, current or given.
-- E.g.: "2013/08/01 05:49:51"
-- Useful for a log file or a display of a lengthy operation.
-- This is Ada 83 compatible. Format accepted by SQL queries.
--
-- 32- or 64-bit: DEC/Compaq/HP Ada (83), GNAT (95/2005), ObjectAda (95)
-- 16-bit: Meridian (83) -> Long_Integer is 32-bit
-- 16-bit: Janus 2.x (83): KO: no Long_Integer
--
-- Test program in following comment:
--
-- with Text_IO,Time_display;procedure Test is begin Text_IO.Put(Time_display);end;
--
function Time_display (
T : Calendar.Time := Calendar.Clock;
Seconds : Boolean := True;
Intra_day : Boolean := True
)
return String
is
subtype Sec_int is Long_Integer; -- must contain 86_400
s : constant Sec_int := Sec_int (Calendar.Seconds (T));
m : constant Sec_int := s / 60;
-- + 100: trick for obtaining 0x
sY : constant String := Integer'Image (Year (T));
sM : constant String := Integer'Image (Month (T) + 100);
sD : constant String := Integer'Image (Day (T) + 100);
shr : constant String := Sec_int'Image (m / 60 + 100);
smn : constant String := Sec_int'Image (m mod 60 + 100);
ssc : constant String := Sec_int'Image (s mod 60 + 100);
--
function Optional_seconds return String is
begin
return (if Seconds then ':' & ssc (ssc'Last - 1 .. ssc'Last) else "");
end Optional_seconds;
--
-- The "if expression" version of that function
-- confuses ObjectAda 10.4.
--
-- function Optional_intra_day return String is
-- begin
-- return
-- (if Intra_day then
-- " " & shr (shr'Last - 1 .. shr'Last) & ':' &
-- smn (smn'Last - 1 .. smn'Last) & Optional_seconds
-- else
-- "");
-- end Optional_intra_day;
function Optional_intra_day return String is
begin
if Intra_day then
return
" " &
shr (shr'Last - 1 .. shr'Last) & ':' &
smn (smn'Last - 1 .. smn'Last) & Optional_seconds;
else
return "";
end if;
end Optional_intra_day;
begin
return
sY (sY'Last - 3 .. sY'Last) & '/' & -- not Year 10'000 compliant.
sM (sM'Last - 1 .. sM'Last) & '/' &
sD (sD'Last - 1 .. sD'Last) &
Optional_intra_day;
end Time_display;
begin
return Time_display (T);
end HAC_Image;
function To_VString (C : Character) return VString is
begin
return To_VString ((1 => C));
end To_VString;
function Slice (Source : VString; Low : Positive; High : Natural) return VString
is
begin
return +VStr_Pkg.Slice (Source, Low, High);
end Slice;
function "&" (I : Integer; V : VString) return VString is
begin
return HAC_Image (I) & V;
end "&";
function "&" (V : VString; I : Integer) return VString is
begin
return V & HAC_Image (I);
end "&";
function "&" (R : Real; V : VString) return VString is
begin
return HAC_Image (R) & V;
end "&";
function "&" (V : VString; R : Real) return VString is
begin
return V & HAC_Image (R);
end "&";
function "&" (D : Duration; V : VString) return VString is
begin
return Image (D) & V;
end "&";
function "&" (V : VString; D : Duration) return VString is
begin
return V & Image (D);
end "&";
function Nice_Image (B : Boolean) return VString is
img : constant String := Boolean'Image (B);
begin
return +(img (img'First) & ACH.To_Lower (img (img'First + 1 .. img'Last)));
end Nice_Image;
function "&" (B : Boolean; V : VString) return VString is
begin
return Nice_Image (B) & V;
end "&";
function "&" (V : VString; B : Boolean) return VString is
begin
return V & Nice_Image (B);
end "&";
function To_Lower (Item : VString) return VString is
begin
return +Ada.Characters.Handling.To_Lower (VStr_Pkg.To_String (Item));
end To_Lower;
function To_Upper (Item : VString) return VString is
begin
return +Ada.Characters.Handling.To_Upper (VStr_Pkg.To_String (Item));
end To_Upper;
function Head (Source : VString; Count : Natural) return VString is
begin
return VStr_Pkg.Head (Source, Count); -- We use the default padding: ' '.
end Head;
function Tail (Source : VString; Count : Natural) return VString is
begin
return VStr_Pkg.Tail (Source, Count); -- We use the default padding: ' '.
end Tail;
function Head_Before_Match (Source : VString; Pattern : Character) return VString is
begin
return Head_Before_Match (Source, (1 => Pattern));
end Head_Before_Match;
function Head_Before_Match (Source : VString; Pattern : String) return VString is
begin
return Head_Before_Match (Source, +Pattern);
end Head_Before_Match;
function Head_Before_Match (Source : VString; Pattern : VString) return VString is
i : constant Natural := Index (Source, Pattern);
begin
return (if i = 0 then Null_VString else Slice (Source, 1, i - 1));
end Head_Before_Match;
function Tail_After_Match (Source : VString; Pattern : Character) return VString is
begin
return Tail_After_Match (Source, (1 => Pattern));
end Tail_After_Match;
function Tail_After_Match (Source : VString; Pattern : String) return VString is
begin
return Tail_After_Match (Source, +Pattern);
end Tail_After_Match;
function Tail_After_Match (Source : VString; Pattern : VString) return VString is
------------------------------------------------------------------------------
-- Description : Extract a substring from Source starting after the Pattern,
-- to the end
-- Arguments : String to scan and Search pattern
-- Return : A substring from the character after the first Pattern
-- found backward to the String's end
-- Author : Stéphane Rivière, 2021
--
-- Examples :
--
-- Tail_After_Match (+"/etc/genesix/gnx-startup",
-- +"/")) returns "gnx-startup"
-- +"ix")) returns "/gnx-startup"
-- +"gene")) returns "six/gnx-startup"
-- +"etc/genesix/gnx-startu")) returns "p"
-- +"/etc/genesix/gnx-startu")) returns "p"
-- +"/etc/genesix/gnx-startup")) returns empty string
-- +"/etc/genesix/gnx-startupp")) returns empty string
------------------------------------------------------------------------------
Result : VString := +"";
Source_Length : constant Natural := Length (Source);
Pattern_Length : constant Natural := Length (Pattern);
begin
for I in reverse 1 .. Source_Length - Pattern_Length loop
if Slice (Source, I, I + Pattern_Length - 1) = Pattern then
Result := Slice (Source, I + Pattern_Length, Source_Length);
exit;
end if;
end loop;
return Result;
end Tail_After_Match;
function Starts_With (Item : VString; Pattern : Character) return Boolean is
begin
return 1 <= Length (Item) and then Element (Item, 1) = Pattern;
end Starts_With;
function Starts_With (Item : VString; Pattern : String) return Boolean is
begin
return Pattern'Length <= Length (Item)
and then VStr_Pkg.To_String (VStr_Pkg.Head (Item, Pattern'Length)) = Pattern;
end Starts_With;
function Starts_With (Item : VString; Pattern : VString) return Boolean is
begin
return Length (Pattern) <= Length (Item)
and then VStr_Pkg.Head (Item, Length (Pattern)) = Pattern;
end Starts_With;
function Ends_With (Item : VString; Pattern : Character) return Boolean is
begin
return 1 <= Length (Item) and then Element (Item, Length (Item)) = Pattern;
end Ends_With;
function Ends_With (Item : VString; Pattern : String) return Boolean is
begin
return Pattern'Length <= Length (Item)
and then VStr_Pkg.To_String (VStr_Pkg.Tail (Item, Pattern'Length)) = Pattern;
end Ends_With;
function Ends_With (Item : VString; Pattern : VString) return Boolean is
begin
return Length (Pattern) <= Length (Item)
and then VStr_Pkg.Tail (Item, Length (Pattern)) = Pattern;
end Ends_With;
-------------
-- Index --
-------------
function Index (Source : VString; Pattern : Character) return Natural is
begin
return VStr_Pkg.Index (Source, (1 => Pattern));
end Index;
function Index (Source : VString; Pattern : String) return Natural is
begin
return VStr_Pkg.Index (Source, Pattern);
end Index;
function Index (Source : VString; Pattern : VString) return Natural is
begin
return VStr_Pkg.Index (Source, VStr_Pkg.To_String (Pattern));
end Index;
function Index (Source : VString; Pattern : Character; From : Positive) return Natural is
begin
return VStr_Pkg.Index (Source, (1 => Pattern), From);
end Index;
function Index (Source : VString; Pattern : String; From : Positive) return Natural is
begin
return VStr_Pkg.Index (Source, Pattern, From);
end Index;
function Index (Source : VString; Pattern : VString; From : Positive) return Natural is
begin
return VStr_Pkg.Index (Source, VStr_Pkg.To_String (Pattern), From);
end Index;
----------------------
-- Index_Backward --
----------------------
function Index_Backward (Source : VString; Pattern : Character) return Natural is
begin
return VStr_Pkg.Index (Source, (1 => Pattern), Ada.Strings.Backward);
end Index_Backward;
function Index_Backward (Source : VString; Pattern : String) return Natural is
begin
return VStr_Pkg.Index (Source, Pattern, Ada.Strings.Backward);
end Index_Backward;
function Index_Backward (Source : VString; Pattern : VString) return Natural is
begin
return VStr_Pkg.Index (Source, VStr_Pkg.To_String (Pattern), Ada.Strings.Backward);
end Index_Backward;
function Index_Backward (Source : VString; Pattern : Character; From : Positive) return Natural is
begin
return VStr_Pkg.Index (Source, (1 => Pattern), From, Ada.Strings.Backward);
end Index_Backward;
function Index_Backward (Source : VString; Pattern : String; From : Positive) return Natural is
begin
return VStr_Pkg.Index (Source, Pattern, From, Ada.Strings.Backward);
end Index_Backward;
function Index_Backward (Source : VString; Pattern : VString; From : Positive) return Natural is
begin
return VStr_Pkg.Index (Source, VStr_Pkg.To_String (Pattern), From, Ada.Strings.Backward);
end Index_Backward;
function "*" (Num : Natural; Pattern : String) return VString is
begin
return +Ada.Strings.Fixed."*" (Num, Pattern);
end "*";
function Trim_Left (Source : VString) return VString is
begin
return VStr_Pkg.Trim (Source, Ada.Strings.Left);
end Trim_Left;
function Trim_Right (Source : VString) return VString is
begin
return VStr_Pkg.Trim (Source, Ada.Strings.Right);
end Trim_Right;
function Trim_Both (Source : VString) return VString is
begin
return VStr_Pkg.Trim (Source, Ada.Strings.Both);
end Trim_Both;
function Image (I : Integer) return VString is
function HAC_Image_for_Integer is
new HAT.HAC_Generic_Image (Abstract_Integer => Integer);
begin
return +HAC_Image_for_Integer (I);
end Image;
function Image (F : Real) return VString is
begin
return +HAC_Image (F);
end Image;
function Image (T : Ada.Calendar.Time) return VString is
begin
return +HAC_Image (T);
end Image;
function Image (D : Duration) return VString is
Im : constant String := Duration'Image (D);
begin
-- Return image without leading ' ' on non-negative values.
return (if D < 0.0 then +Im else +Im (Im'First + 1 .. Im'Last));
end Image;
function Integer_Value (V : VString) return Integer is
begin
return Integer'Value (VStr_Pkg.To_String (V));
end Integer_Value;
function Float_Value (V : VString) return Real is
begin
return Real'Value (VStr_Pkg.To_String (V));
end Float_Value;
procedure Open (File : in out File_Type; Name : String) is
use Ada.Text_IO;
begin
Open (File, In_File, Name);
end Open;
procedure Open (File : in out File_Type; Name : VString) is
begin Open (File, VStr_Pkg.To_String (Name)); end Open;
procedure Create (File : in out File_Type; Name : String) is
use Ada.Text_IO;
begin
Create (File, Out_File, Name);
end Create;
procedure Create (File : in out File_Type; Name : VString) is
begin Create (File, VStr_Pkg.To_String (Name)); end Create;
procedure Append (File : in out File_Type; Name : String) is
use Ada.Text_IO;
begin
Open (File, Append_File, Name);
end Append;
procedure Append (File : in out File_Type; Name : VString) is
begin
Append (File, VStr_Pkg.To_String (Name));
end Append;
---------
-- GET --
---------
procedure Get (I : out Integer) is begin IIO.Get (I); end Get;
procedure Get (File : File_Type; I : out Integer) is begin IIO.Get (File, I); end Get;
procedure Get (F : out Real) is begin RIO.Get (F); end Get;
procedure Get (File : File_Type; F : out Real) is begin RIO.Get (File, F); end Get;
--------------
-- GET_LINE --
--------------
procedure Get_Line (C : out Character) is begin Get (C); Skip_Line; end Get_Line;
procedure Get_Line (File : File_Type; C : out Character) is
begin Get (File, C); Skip_Line (File); end Get_Line;
procedure Get_Line (I : out Integer) is begin Get (I); Skip_Line; end Get_Line;
procedure Get_Line (File : File_Type; I : out Integer) is
begin Get (File, I); Skip_Line (File); end Get_Line;
procedure Get_Line (F : out Real) is begin Get (F); Skip_Line; end Get_Line;
procedure Get_Line (File : File_Type; F : out Real) is
begin Get (File, F); Skip_Line (File); end Get_Line;
procedure Get_Line (V : out VString) is begin V := +Ada.Text_IO.Get_Line; end Get_Line;
procedure Get_Line (File : File_Type; V : out VString) is
begin V := +Ada.Text_IO.Get_Line (File); end Get_Line;
---------
-- PUT --
---------
procedure Put (C : Character) is
begin
Character'Write (Ada.Text_IO.Text_Streams.Stream (Ada.Text_IO.Current_Output), C);
end Put;
procedure Put (File : File_Type; C : Character) is
begin
Character'Write (Ada.Text_IO.Text_Streams.Stream (File), C);
end Put;
procedure Put (B : Boolean;
Width : Ada.Text_IO.Field := BIO.Default_Width)
is
begin
BIO.Put (B, Width);
end Put;
procedure Put (File : File_Type;
B : Boolean;
Width : Ada.Text_IO.Field := BIO.Default_Width)
is
begin
BIO.Put (File, B, Width);
end Put;
procedure Put (S : in String) is
begin
String'Write (Ada.Text_IO.Text_Streams.Stream (Ada.Text_IO.Current_Output), S);
end Put;
procedure Put (File : File_Type; S : in String) is
begin
String'Write (Ada.Text_IO.Text_Streams.Stream (File), S);
end Put;
procedure Put (V : in VString) is begin Put (VStr_Pkg.To_String (V)); end Put;
procedure Put (File : File_Type; V : in VString) is begin Put (File, VStr_Pkg.To_String (V)); end Put;
--------------
-- PUT_LINE --
--------------
procedure Put_Line (C : Character) is begin Put (C); New_Line; end Put_Line;
procedure Put_Line (File : File_Type; C : in Character) is
begin Put (File, C); New_Line (File); end Put_Line;
procedure Put_Line (I : Integer;
Width : Ada.Text_IO.Field := IIO.Default_Width;
Base : Ada.Text_IO.Number_Base := IIO.Default_Base)
is
begin
Put (I, Width, Base);
New_Line;
end Put_Line;
procedure Put_Line (File : File_Type;
I : Integer;
Width : Ada.Text_IO.Field := IIO.Default_Width;
Base : Ada.Text_IO.Number_Base := IIO.Default_Base)
is
begin
Put (File, I, Width, Base);
New_Line (File);
end Put_Line;
procedure Put_Line (F : Real;
Fore : Integer := RIO.Default_Fore;
Aft : Integer := RIO.Default_Aft;
Expo : Integer := RIO.Default_Exp)
is
begin
Put (F, Fore, Aft, Expo);
New_Line;
end Put_Line;
procedure Put_Line (File : File_Type;
F : Real;
Fore : Integer := RIO.Default_Fore;
Aft : Integer := RIO.Default_Aft;
Expo : Integer := RIO.Default_Exp)
is
begin
Put (File, F, Fore, Aft, Expo);
New_Line (File);
end Put_Line;
procedure Put_Line (B : Boolean;
Width : Ada.Text_IO.Field := BIO.Default_Width)
is
begin
Put (B, Width);
New_Line;
end Put_Line;
procedure Put_Line (File : File_Type;
B : Boolean;
Width : Ada.Text_IO.Field := BIO.Default_Width)
is
begin
Put (File, B, Width);
New_Line (File);
end Put_Line;
procedure Put_Line (V : VString) is begin Put_Line (VStr_Pkg.To_String (V)); end Put_Line;
procedure Put_Line (File : File_Type; V : VString) is begin Put_Line (File, VStr_Pkg.To_String (V)); end Put_Line;
----------
-- WAIT --
----------
procedure Wait (S : Semaphore) is
begin
raise Program_Error with "WAIT unimplemented";
end Wait;
------------
-- SIGNAL --
------------
procedure Signal (S : Semaphore) is
begin
raise Program_Error with "SIGNAL unimplemented";
end Signal;
function Argument (Number : Positive) return VString is
begin
return +Ada.Command_Line.Argument (Number);
end Argument;
function Command_Name return VString is
begin
return +Ada.Command_Line.Command_Name;
end Command_Name;
procedure Set_Exit_Status (Code : in Integer) is
begin
Ada.Command_Line.Set_Exit_Status (Ada.Command_Line.Exit_Status (Code));
end Set_Exit_Status;
function Get_Env (Name : String) return VString is
use Ada.Environment_Variables;
begin
return
(if Ada.Environment_Variables.Exists (Name) then +Value (Name)
else Null_VString);
end Get_Env;
function Get_Env (Name : VString) return VString is
begin
return Get_Env (VStr_Pkg.To_String (Name));
end Get_Env;
procedure Set_Env (Name : VString; Value : String) is
begin
Set_Env (VStr_Pkg.To_String (Name), Value);
end Set_Env;
procedure Set_Env (Name : String; Value : VString) is
begin
Set_Env (Name, VStr_Pkg.To_String (Value));
end Set_Env;
procedure Set_Env (Name : VString; Value : VString) is
begin
Set_Env (VStr_Pkg.To_String (Name), VStr_Pkg.To_String (Value));
end Set_Env;
package String_Maps is new Ada.Containers.Hashed_Maps
(Key_Type => VString,
Element_Type => VString,
Hash => Ada.Strings.Unbounded.Hash,
Equivalent_Keys => HAT."=",
"=" => HAT."=");
-- We emulate here the pool of VM variables attached to the HAC VM.
global_VM_variables : String_Maps.Map;
function Get_VM_Variable (Name : String) return VString is
begin
return Get_VM_Variable (+Name);
end Get_VM_Variable;
function Get_VM_Variable (Name : VString) return VString is
cur : constant String_Maps.Cursor := global_VM_variables.Find (Name);
use String_Maps;
begin
return
(if cur = String_Maps.No_Element then Null_VString
else String_Maps.Element (cur));
end Get_VM_Variable;
procedure Set_VM_Variable (Name : String; Value : String) is
begin
Set_VM_Variable (+Name, +Value);
end Set_VM_Variable;
procedure Set_VM_Variable (Name : VString; Value : String) is
begin
Set_VM_Variable (Name, +Value);
end Set_VM_Variable;
procedure Set_VM_Variable (Name : String; Value : VString) is
begin
Set_VM_Variable (+Name, Value);
end Set_VM_Variable;
procedure Set_VM_Variable (Name : VString; Value : VString) is
begin
global_VM_variables.Include (Name, Value);
end Set_VM_Variable;
function Current_Directory return VString is
begin
return +Ada.Directories.Current_Directory;
end Current_Directory;
procedure Set_Directory (Directory : VString) is
begin
Set_Directory (VStr_Pkg.To_String (Directory));
end Set_Directory;
procedure Copy_File (Source_Name : String; Target_Name : String) is
begin
Ada.Directories.Copy_File (Source_Name, Target_Name); -- Form: default value "".
end Copy_File;
procedure Copy_File (Source_Name : VString; Target_Name : String) is
begin
Copy_File (VStr_Pkg.To_String (Source_Name), Target_Name);
end Copy_File;
procedure Copy_File (Source_Name : String; Target_Name : VString) is
begin
Copy_File (Source_Name, VStr_Pkg.To_String (Target_Name));
end Copy_File;
procedure Copy_File (Source_Name : VString; Target_Name : VString) is
begin
Copy_File (VStr_Pkg.To_String (Source_Name), VStr_Pkg.To_String (Target_Name));
end Copy_File;
procedure Delete_File (Name : VString) is
begin
Delete_File (VStr_Pkg.To_String (Name));
end Delete_File;
function Exists (Name : VString) return Boolean is
begin
return Exists (VStr_Pkg.To_String (Name));
end Exists;
function Directory_Exists (Name : String) return Boolean is
use Ada.Directories;
begin
return Exists (Name) and then Kind (Name) = Directory;
end Directory_Exists;
function Directory_Exists (Name : VString) return Boolean is
begin
return Directory_Exists (VStr_Pkg.To_String (Name));
end Directory_Exists;
function File_Exists (Name : String) return Boolean is
use Ada.Directories;
begin
return Exists (Name) and then Kind (Name) = Ordinary_File;
end File_Exists;
function File_Exists (Name : VString) return Boolean is
begin
return File_Exists (VStr_Pkg.To_String (Name));
end File_Exists;
procedure Rename (Old_Name : VString; New_Name : String) is
begin
Rename (VStr_Pkg.To_String (Old_Name), New_Name);
end Rename;
procedure Rename (Old_Name : String; New_Name : VString) is
begin
Rename (Old_Name, VStr_Pkg.To_String (New_Name));
end Rename;
procedure Rename (Old_Name : VString; New_Name : VString) is
begin
Rename (VStr_Pkg.To_String (Old_Name), VStr_Pkg.To_String (New_Name));
end Rename;
function HAC_Generic_Image (I : Abstract_Integer) return String is
Im : constant String := Abstract_Integer'Image (I);
begin
-- Return image without leading ' ' on non-negative values.
return (if I < 0 then Im else Im (Im'First + 1 .. Im'Last));
end HAC_Generic_Image;
largest_without_exponent : constant := 10.0 ** (Real'Digits - 1);
function HAC_Image (F : Real) return String is
-- Code from TeXCAD (tc.adb, TeX_Number),
-- less a few simplifications.
s : String (1 .. Real'Digits + 15);
na, nb, np, ne : Natural;
function Image_with_exponent return String is
begin
RIO.Put (s, F);
na := s'First;
for i in s'Range loop
case s (i) is
when ' ' => na := i + 1; -- * Trim spaces on the left
when others => null;
end case;
end loop;
ne := Ada.Strings.Fixed.Index (s, "0E");
if ne > 0 then
-- Simplify "4.56000000000000E+68" into "4.56E+68".
-- * Remove extra '0's...
nb := ne - 1;
while s (nb) = '0' loop
nb := nb - 1;
end loop;
if s (nb) = '.' then
-- "4.E+68" from "4.00000000000000E+68" would be too much trimming...
nb := nb + 1; -- We keep one '0' -> "4.0E+68".
end if;
return s (na .. nb) & s (ne + 1 .. s'Last);
end if;
return s (na .. s'Last);
end Image_with_exponent;
--
function Count_Nonzero_Digits (any : String) return Natural is
n : Natural := 0;
begin
for c of any loop
exit when c = 'E'; -- Ignore exponent part.
if c in '1' .. '9' then
n := n + 1;
end if;
end loop;
return n;
end Count_Nonzero_Digits;
begin
if abs F >= largest_without_exponent then
return Image_with_exponent;
end if;
-- Image without exponent (E).
-- If the number is too large for this layout, the Layout_Error
-- exception is raised and we call Image_with_exponent.
RIO.Put (s, F, Exp => 0);
declare
F_image : constant String := Real'Image (F);
tolerance : constant := 1;
begin
if Count_Nonzero_Digits (s) + tolerance < Count_Nonzero_Digits (F_image) then
return Image_with_exponent;
-- Significant loss of significant digits.
-- Typically 6.62607015e-34 is displayed as 0.0[0] unless the
-- type Real has a 34 digits precision (unlikely...). See Strings test.
-- The tolerance is due to the case where s is, e.g., "123.4567890"
-- and F_image is "1.234567891E+02". Spot the last significant
-- digit: '0' vs. '1'. Such an accuracy error is normal.
end if;
end;
-- We don't want to lose any digit in the decimal representation without exponent.
na := s'First;
nb := s'Last;
np := 0;
for i in s'Range loop
case s (i) is
when '.' => np := i; exit; -- Find a decimal point
when ' ' => na := i + 1; -- * Trim spaces on the left
when others => null;
end case;
end loop;
if np > 0 then
-- In case of a decimal point.
while nb > np + 1 and then s (nb) = '0' loop
nb := nb - 1; -- * Remove extra '0's except for "x.0"
end loop;
end if;
return s (na .. nb);
exception
when Ada.Text_IO.Layout_Error =>
-- Number too large, we fall back to show the version with exponent.
return Image_with_exponent;
end HAC_Image;
package Non_Standard is
procedure Sys (Command : String; Result : out Integer);
function Directory_Separator return Character;
end Non_Standard;
package body Non_Standard is separate;
procedure Shell_Execute (Command : String; Result : out Integer) is
-- https://rosettacode.org/wiki/Execute_a_system_command#Ada
begin
Non_Standard.Sys (Command, Result);
end Shell_Execute;
procedure Shell_Execute (Command : VString; Result : out Integer) is
begin
Shell_Execute (VStr_Pkg.To_String (Command), Result);
end Shell_Execute;
procedure Shell_Execute (Command : String) is
Dummy : Integer;
begin
Shell_Execute (Command, Dummy);
end Shell_Execute;
procedure Shell_Execute (Command : VString) is
begin
Shell_Execute (VStr_Pkg.To_String (Command));
end Shell_Execute;
-- Versions with outward piping:
procedure Shell_Execute (Command : String; Result : out Integer; Output : out VString) is
package SIO renames Ada.Streams.Stream_IO;
temp_1, temp_2 : SIO.File_Type;
begin
SIO.Create (temp_1, SIO.Out_File, "");
declare
temp_name_2 : constant String := SIO.Name (temp_1) & "_shell_exec.tmp";
begin
Non_Standard.Sys (Command & '>' & temp_name_2, Result);
if Exists (temp_name_2) then
SIO.Open (temp_2, SIO.In_File, temp_name_2);
declare
size : constant SIO.Count := SIO.Size (temp_2);
buffer : String (1 .. Natural (size));
begin
if SIO.">" (size, 0) then
String'Read (SIO.Stream (temp_2), buffer);
Output := To_VString (buffer);
else
Output := Null_VString;
end if;
end;
SIO.Delete (temp_2);
else
Output := Null_VString;
end if;
end;
SIO.Close (temp_1);
end Shell_Execute;
procedure Shell_Execute (Command : VString; Result : out Integer; Output : out VString) is
begin
Shell_Execute (VStr_Pkg.To_String (Command), Result, Output);
end Shell_Execute;
procedure Shell_Execute (Command : String; Output : out VString) is
Dummy : Integer;
begin
Shell_Execute (Command, Dummy, Output);
end Shell_Execute;
procedure Shell_Execute (Command : VString; Output : out VString) is
begin
Shell_Execute (VStr_Pkg.To_String (Command), Output);
end Shell_Execute;
function Directory_Separator return Character is
begin
return Non_Standard.Directory_Separator;
end Directory_Separator;
begin
pragma Assert
(Real'Digits >= Interfaces.IEEE_Float_64'Digits,
"HAT.Real must have at least the precision of IEEE Double Precision");
Ada.Numerics.Float_Random.Reset (gen); -- Randomize.
end HAT;
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