-- --
-- B o d y --
-- --
--- Copyright (C) 2002-2007, AdaCore --
+-- Copyright (C) 2002-2011, AdaCore --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-with Ada.Exceptions; use Ada.Exceptions;
-with Ada.IO_Exceptions; use Ada.IO_Exceptions;
+with Ada.IO_Exceptions; use Ada.IO_Exceptions;
+with Ada.Characters.Handling; use Ada.Characters.Handling;
+with Ada.Directories;
with GNAT.Heap_Sort_G;
with GNAT.OS_Lib; use GNAT.OS_Lib;
-- h (w) = (g (f1 (w)) + g (f2 (w))) mod m
- -- where f1 and f2 are functions that map strings into integers, and g is a
- -- function that maps integers into [0, m-1]. h can be order preserving.
- -- For instance, let W = {w_0, ..., w_i, ...,
- -- w_m-1}, h can be defined such that h (w_i) = i.
+ -- where f1 and f2 are functions that map strings into integers, and g is
+ -- a function that maps integers into [0, m-1]. h can be order preserving.
+ -- For instance, let W = {w_0, ..., w_i, ..., w_m-1}, h can be defined
+ -- such that h (w_i) = i.
-- This algorithm defines two possible constructions of f1 and f2. Method
-- b) stores the hash function in less memory space at the expense of
-- Random graphs are frequently used to solve difficult problems that do
-- not have polynomial solutions. This algorithm is based on a weighted
- -- undirected graph. It comprises two steps: mapping and assigment.
+ -- undirected graph. It comprises two steps: mapping and assignment.
-- In the mapping step, a graph G = (V, E) is constructed, where = {0, 1,
-- ..., n-1} and E = {(for w in W) (f1 (w), f2 (w))}. In order for the
-- probability of generating an acyclic graph, n >= 2m. If it is not
-- acyclic, Tk have to be regenerated.
- -- In the assignment step, the algorithm builds function g. As is acyclic,
- -- there is a vertex v1 with only one neighbor v2. Let w_i be the word such
- -- that v1 = f1 (w_i) and v2 = f2 (w_i). Let g (v1) = 0 by construction and
- -- g (v2) = (i - g (v1)) mod n (or to be general, (h (i) - g (v1) mod n).
+ -- In the assignment step, the algorithm builds function g. As G is
+ -- acyclic, there is a vertex v1 with only one neighbor v2. Let w_i be
+ -- the word such that v1 = f1 (w_i) and v2 = f2 (w_i). Let g (v1) = 0 by
+ -- construction and g (v2) = (i - g (v1)) mod n (or h (i) - g (v1) mod n).
-- If word w_j is such that v2 = f1 (w_j) and v3 = f2 (w_j), g (v3) = (j -
-- g (v2)) mod (or to be general, (h (j) - g (v2)) mod n). If w_i has no
-- neighbor, then another vertex is selected. The algorithm traverses G to
No_Edge : constant Edge_Id := -1;
No_Table : constant Table_Id := -1;
- Max_Word_Length : constant := 32;
- subtype Word_Type is String (1 .. Max_Word_Length);
- Null_Word : constant Word_Type := (others => ASCII.NUL);
- -- Store keyword in a word. Note that the length of word is limited to 32
- -- characters.
+ type Word_Type is new String_Access;
+ procedure Free_Word (W : in out Word_Type) renames Free;
+ function New_Word (S : String) return Word_Type;
+
+ procedure Resize_Word (W : in out Word_Type; Len : Natural);
+ -- Resize string W to have a length Len
type Key_Type is record
Edge : Edge_Id;
package WT is new GNAT.Table (Word_Type, Word_Id, 0, 32, 32);
package IT is new GNAT.Table (Integer, Integer, 0, 32, 32);
- -- The two main tables. IT is used to store several tables of components
- -- containing only integers.
+ -- The two main tables. WT is used to store the words in their initial
+ -- version and in their reduced version (that is words reduced to their
+ -- significant characters). As an instance of GNAT.Table, WT does not
+ -- initialize string pointers to null. This initialization has to be done
+ -- manually when the table is allocated. IT is used to store several
+ -- tables of components containing only integers.
function Image (Int : Integer; W : Natural := 0) return String;
function Image (Str : String; W : Natural := 0) return String;
-- Return a string which includes string Str or integer Int preceded by
-- leading spaces if required by width W.
+ function Trim_Trailing_Nuls (Str : String) return String;
+ -- Return Str with trailing NUL characters removed
+
Output : File_Descriptor renames GNAT.OS_Lib.Standout;
-- Shortcuts
procedure Put_Vertex_Table (File : File_Descriptor; Title : String);
-- Output a title and a vertex table
+ function Ada_File_Base_Name (Pkg_Name : String) return String;
+ -- Return the base file name (i.e. without .ads/.adb extension) for an
+ -- Ada source file containing the named package, using the standard GNAT
+ -- file-naming convention. For example, if Pkg_Name is "Parent.Child", we
+ -- return "parent-child".
+
----------------------------------
-- Character Position Selection --
----------------------------------
function Allocate (N : Natural; S : Natural := 1) return Table_Id;
-- Allocate N * S ints from IT table
- procedure Free_Tmp_Tables;
- -- Deallocate the tables used by the algorithm (but not the keys table)
-
----------
-- Keys --
----------
-- Optimization mode (memory vs CPU)
Max_Key_Len : Natural := 0;
- Min_Key_Len : Natural := Max_Word_Length;
+ Min_Key_Len : Natural := 0;
-- Maximum and minimum of all the word length
S : Natural;
return True;
end Acyclic;
+ ------------------------
+ -- Ada_File_Base_Name --
+ ------------------------
+
+ function Ada_File_Base_Name (Pkg_Name : String) return String is
+ begin
+ -- Convert to lower case, then replace '.' with '-'
+
+ return Result : String := To_Lower (Pkg_Name) do
+ for J in Result'Range loop
+ if Result (J) = '.' then
+ Result (J) := '-';
+ end if;
+ end loop;
+ end return;
+ end Ada_File_Base_Name;
+
---------
-- Add --
---------
procedure Add (C : Character) is
+ pragma Assert (C /= ASCII.NUL);
begin
Line (Last + 1) := C;
Last := Last + 1;
procedure Add (S : String) is
Len : constant Natural := S'Length;
begin
+ for J in S'Range loop
+ pragma Assert (S (J) /= ASCII.NUL);
+ null;
+ end loop;
+
Line (Last + 1 .. Last + Len) := S;
Last := Last + Len;
end Add;
-- Allocate --
--------------
- function Allocate (N : Natural; S : Natural := 1) return Table_Id is
+ function Allocate (N : Natural; S : Natural := 1) return Table_Id is
L : constant Integer := IT.Last;
begin
IT.Set_Last (L + N * S);
+
+ -- Initialize, so debugging printouts don't trip over uninitialized
+ -- components.
+
+ for J in L + 1 .. IT.Last loop
+ IT.Table (J) := -1;
+ end loop;
+
return L + 1;
end Allocate;
procedure Apply_Position_Selection is
begin
- WT.Set_Last (2 * NK);
for J in 0 .. NK - 1 loop
declare
- I_Word : constant Word_Type := WT.Table (Initial (J));
- R_Word : Word_Type := Null_Word;
- Index : Natural := I_Word'First - 1;
+ IW : constant String := WT.Table (Initial (J)).all;
+ RW : String (1 .. IW'Length) := (others => ASCII.NUL);
+ N : Natural := IW'First - 1;
begin
-- Select the characters of Word included in the position
-- selection.
for C in 0 .. Char_Pos_Set_Len - 1 loop
- exit when I_Word (Get_Char_Pos (C)) = ASCII.NUL;
- Index := Index + 1;
- R_Word (Index) := I_Word (Get_Char_Pos (C));
+ exit when IW (Get_Char_Pos (C)) = ASCII.NUL;
+ N := N + 1;
+ RW (N) := IW (Get_Char_Pos (C));
end loop;
- -- Build the new table with the reduced word
+ -- Build the new table with the reduced word. Be careful
+ -- to deallocate the old version to avoid memory leaks.
- WT.Table (Reduced (J)) := R_Word;
+ Free_Word (WT.Table (Reduced (J)));
+ WT.Table (Reduced (J)) := New_Word (RW);
Set_Key (J, (Edge => No_Edge));
end;
end loop;
-- Start of processing for Assign_Values_To_Vertices
begin
- -- Value -1 denotes an unitialized value as it is supposed to
+ -- Value -1 denotes an uninitialized value as it is supposed to
-- be in the range 0 .. NK.
if G = No_Table then
Success : Boolean := False;
begin
- NV := Natural (K2V * Float (NK));
-
- Keys := Allocate (NK);
+ if NK = 0 then
+ raise Program_Error with "keywords set cannot be empty";
+ end if;
if Verbose then
Put_Initial_Keys (Output, "Initial Key Table");
procedure Finalize is
begin
- Free_Tmp_Tables;
+ if Verbose then
+ Put (Output, "Finalize");
+ New_Line (Output);
+ end if;
- WT.Release;
- IT.Release;
+ -- Deallocate all the WT components (both initial and reduced ones) to
+ -- avoid memory leaks.
- NK := 0;
- Max_Key_Len := 0;
- Min_Key_Len := Max_Word_Length;
- end Finalize;
+ for W in 0 .. WT.Last loop
- ---------------------
- -- Free_Tmp_Tables --
- ---------------------
+ -- Note: WT.Table (NK) is a temporary variable, do not free it since
+ -- this would cause a double free.
- procedure Free_Tmp_Tables is
- begin
- IT.Init;
+ if W /= NK then
+ Free_Word (WT.Table (W));
+ end if;
+ end loop;
+
+ WT.Release;
+ IT.Release;
+
+ -- Reset all variables for next usage
Keys := No_Table;
Vertices := No_Table;
NV := 0;
- end Free_Tmp_Tables;
+
+ NK := 0;
+ Max_Key_Len := 0;
+ Min_Key_Len := 0;
+ end Finalize;
----------------------------
-- Generate_Mapping_Table --
procedure Initialize
(Seed : Natural;
K_To_V : Float := Default_K_To_V;
- Optim : Optimization := CPU_Time;
+ Optim : Optimization := Memory_Space;
Tries : Positive := Default_Tries)
is
begin
- -- Free previous tables (the settings may have changed between two runs)
-
- Free_Tmp_Tables;
-
- if K_To_V <= 2.0 then
- Put (Output, "K to V ratio cannot be lower than 2.0");
+ if Verbose then
+ Put (Output, "Initialize");
New_Line (Output);
- raise Program_Error;
end if;
+ -- Deallocate the part of the table concerning the reduced words.
+ -- Initial words are already present in the table. We may have reduced
+ -- words already there because a previous computation failed. We are
+ -- currently retrying and the reduced words have to be deallocated.
+
+ for W in Reduced (0) .. WT.Last loop
+ Free_Word (WT.Table (W));
+ end loop;
+
+ IT.Init;
+
+ -- Initialize of computation variables
+
+ Keys := No_Table;
+
+ Char_Pos_Set := No_Table;
+ Char_Pos_Set_Len := 0;
+
+ Used_Char_Set := No_Table;
+ Used_Char_Set_Len := 0;
+
+ T1 := No_Table;
+ T2 := No_Table;
+
+ T1_Len := 0;
+ T2_Len := 0;
+
+ G := No_Table;
+ G_Len := 0;
+
+ Edges := No_Table;
+ Edges_Len := 0;
+
+ Vertices := No_Table;
+ NV := 0;
+
S := Seed;
K2V := K_To_V;
Opt := Optim;
NT := Tries;
+
+ if K2V <= 2.0 then
+ raise Program_Error with "K to V ratio cannot be lower than 2.0";
+ end if;
+
+ -- Do not accept a value of K2V too close to 2.0 such that once
+ -- rounded up, NV = 2 * NK because the algorithm would not converge.
+
+ NV := Natural (Float (NK) * K2V);
+ if NV <= 2 * NK then
+ NV := 2 * NK + 1;
+ end if;
+
+ Keys := Allocate (NK);
+
+ -- Resize initial words to have all of them at the same size
+ -- (so the size of the largest one).
+
+ for K in 0 .. NK - 1 loop
+ Resize_Word (WT.Table (Initial (K)), Max_Key_Len);
+ end loop;
+
+ -- Allocated the table to store the reduced words. As WT is a
+ -- GNAT.Table (using C memory management), pointers have to be
+ -- explicitly initialized to null.
+
+ WT.Set_Last (Reduced (NK - 1));
+
+ -- Note: Reduced (0) = NK + 1
+
+ WT.Table (NK) := null;
+
+ for W in 0 .. NK - 1 loop
+ WT.Table (Reduced (W)) := null;
+ end loop;
end Initialize;
------------
------------
procedure Insert (Value : String) is
- Word : Word_Type := Null_Word;
Len : constant Natural := Value'Length;
begin
- Word (1 .. Len) := Value (Value'First .. Value'First + Len - 1);
- WT.Set_Last (NK);
- WT.Table (NK) := Word;
- NK := NK + 1;
- NV := Natural (Float (NK) * K2V);
+ if Verbose then
+ Put (Output, "Inserting """ & Value & """");
+ New_Line (Output);
+ end if;
- -- Do not accept a value of K2V too close to 2.0 such that once rounded
- -- up, NV = 2 * NK because the algorithm would not converge.
+ for J in Value'Range loop
+ pragma Assert (Value (J) /= ASCII.NUL);
+ null;
+ end loop;
- if NV <= 2 * NK then
- NV := 2 * NK + 1;
- end if;
+ WT.Set_Last (NK);
+ WT.Table (NK) := New_Word (Value);
+ NK := NK + 1;
if Max_Key_Len < Len then
Max_Key_Len := Len;
end if;
- if Len < Min_Key_Len then
+ if Min_Key_Len = 0 or else Len < Min_Key_Len then
Min_Key_Len := Len;
end if;
end Insert;
end if;
end New_Line;
+ --------------
+ -- New_Word --
+ --------------
+
+ function New_Word (S : String) return Word_Type is
+ begin
+ return new String'(S);
+ end New_Word;
+
------------------------------
-- Parse_Position_Selection --
------------------------------
end if;
if C not in '0' .. '9' then
- Raise_Exception
- (Program_Error'Identity, "cannot read position argument");
+ raise Program_Error with "cannot read position argument";
end if;
while C in '0' .. '9' loop
exit when L < N;
if Argument (N) /= ',' then
- Raise_Exception
- (Program_Error'Identity, "cannot read position argument");
+ raise Program_Error with "cannot read position argument";
end if;
N := N + 1;
-- Produce --
-------------
- procedure Produce (Pkg_Name : String := Default_Pkg_Name) is
- File : File_Descriptor;
+ procedure Produce
+ (Pkg_Name : String := Default_Pkg_Name;
+ Use_Stdout : Boolean := False)
+ is
+ File : File_Descriptor := Standout;
Status : Boolean;
-- For call to Close
L : Natural;
P : Natural;
- PLen : constant Natural := Pkg_Name'Length;
- FName : String (1 .. PLen + 4);
+ FName : String := Ada_File_Base_Name (Pkg_Name) & ".ads";
+ -- Initially, the name of the spec file, then modified to be the name of
+ -- the body file. Not used if Use_Stdout is True.
-- Start of processing for Produce
begin
- FName (1 .. PLen) := Pkg_Name;
- for J in 1 .. PLen loop
- if FName (J) in 'A' .. 'Z' then
- FName (J) := Character'Val (Character'Pos (FName (J))
- - Character'Pos ('A')
- + Character'Pos ('a'));
-
- elsif FName (J) = '.' then
- FName (J) := '-';
- end if;
- end loop;
- FName (PLen + 1 .. PLen + 4) := ".ads";
+ if Verbose and then not Use_Stdout then
+ Put (Output,
+ "Producing " & Ada.Directories.Current_Directory & "/" & FName);
+ New_Line (Output);
+ end if;
+
+ if not Use_Stdout then
+ File := Create_File (FName, Binary);
- File := Create_File (FName, Binary);
+ if File = Invalid_FD then
+ raise Program_Error with "cannot create: " & FName;
+ end if;
+ end if;
Put (File, "package ");
Put (File, Pkg_Name);
Put (File, Pkg_Name);
Put (File, ";");
New_Line (File);
- Close (File, Status);
- if not Status then
- raise Device_Error;
+ if not Use_Stdout then
+ Close (File, Status);
+
+ if not Status then
+ raise Device_Error;
+ end if;
end if;
- FName (PLen + 4) := 'b';
+ if not Use_Stdout then
+
+ -- Set to body file name
+
+ FName (FName'Last) := 'b';
+
+ File := Create_File (FName, Binary);
- File := Create_File (FName, Binary);
+ if File = Invalid_FD then
+ raise Program_Error with "cannot create: " & FName;
+ end if;
+ end if;
Put (File, "with Interfaces; use Interfaces;");
New_Line (File);
New_Line (File);
- if Opt = CPU_Time then
- Put_Int_Matrix
- (File,
- Array_Img ("T1", Type_Img (NV),
- Range_Img (0, T1_Len - 1),
- Range_Img (0, T2_Len - 1, Type_Img (256))),
- T1, T1_Len, T2_Len);
-
- else
- Put_Int_Matrix
- (File,
- Array_Img ("T1", Type_Img (NV),
- Range_Img (0, T1_Len - 1)),
- T1, T1_Len, 0);
- end if;
+ case Opt is
+ when CPU_Time =>
+ Put_Int_Matrix
+ (File,
+ Array_Img ("T1", Type_Img (NV),
+ Range_Img (0, T1_Len - 1),
+ Range_Img (0, T2_Len - 1, Type_Img (256))),
+ T1, T1_Len, T2_Len);
+
+ when Memory_Space =>
+ Put_Int_Matrix
+ (File,
+ Array_Img ("T1", Type_Img (NV),
+ Range_Img (0, T1_Len - 1)),
+ T1, T1_Len, 0);
+ end case;
New_Line (File);
- if Opt = CPU_Time then
- Put_Int_Matrix
- (File,
- Array_Img ("T2", Type_Img (NV),
- Range_Img (0, T1_Len - 1),
- Range_Img (0, T2_Len - 1, Type_Img (256))),
- T2, T1_Len, T2_Len);
-
- else
- Put_Int_Matrix
- (File,
- Array_Img ("T2", Type_Img (NV),
- Range_Img (0, T1_Len - 1)),
- T2, T1_Len, 0);
- end if;
+ case Opt is
+ when CPU_Time =>
+ Put_Int_Matrix
+ (File,
+ Array_Img ("T2", Type_Img (NV),
+ Range_Img (0, T1_Len - 1),
+ Range_Img (0, T2_Len - 1, Type_Img (256))),
+ T2, T1_Len, T2_Len);
+
+ when Memory_Space =>
+ Put_Int_Matrix
+ (File,
+ Array_Img ("T2", Type_Img (NV),
+ Range_Img (0, T1_Len - 1)),
+ T2, T1_Len, 0);
+ end case;
New_Line (File);
Put (File, " J : ");
- if Opt = CPU_Time then
- Put (File, Type_Img (256));
- else
- Put (File, "Natural");
- end if;
+ case Opt is
+ when CPU_Time =>
+ Put (File, Type_Img (256));
+ when Memory_Space =>
+ Put (File, "Natural");
+ end case;
Put (File, ";");
New_Line (File);
New_Line (File);
Put (File, " J := ");
- if Opt = CPU_Time then
- Put (File, "C");
- else
- Put (File, "Character'Pos");
- end if;
+ case Opt is
+ when CPU_Time =>
+ Put (File, "C");
+ when Memory_Space =>
+ Put (File, "Character'Pos");
+ end case;
Put (File, " (S (P (K) + F));");
New_Line (File);
Put (File, Pkg_Name);
Put (File, ";");
New_Line (File);
- Close (File, Status);
- if not Status then
- raise Device_Error;
+ if not Use_Stdout then
+ Close (File, Status);
+
+ if not Status then
+ raise Device_Error;
+ end if;
end if;
end Produce;
procedure Put (File : File_Descriptor; Str : String) is
Len : constant Natural := Str'Length;
begin
+ for J in Str'Range loop
+ pragma Assert (Str (J) /= ASCII.NUL);
+ null;
+ end loop;
+
if Write (File, Str'Address, Len) /= Len then
raise Program_Error;
end if;
Last := 0;
end if;
- if Last + Len + 3 > Max then
+ if Last + Len + 3 >= Max then
Flush;
end if;
if Last = 0 then
- Line (Last + 1 .. Last + 5) := " ";
- Last := Last + 5;
+ Add (" ");
if F1 <= L1 then
if C1 = F1 and then C2 = F2 then
Add (' ');
end if;
- Line (Last + 1 .. Last + Len) := S;
- Last := Last + Len;
+ Add (S);
if C2 = L2 then
Add (')');
K := Get_Key (J);
Put (File, Image (J, M), F1, L1, J, 1, 3, 1);
Put (File, Image (K.Edge, M), F1, L1, J, 1, 3, 2);
- Put (File, WT.Table (Initial (J)), F1, L1, J, 1, 3, 3);
+ Put (File, Trim_Trailing_Nuls (WT.Table (Initial (J)).all),
+ F1, L1, J, 1, 3, 3);
end loop;
end Put_Initial_Keys;
K := Get_Key (J);
Put (File, Image (J, M), F1, L1, J, 1, 3, 1);
Put (File, Image (K.Edge, M), F1, L1, J, 1, 3, 2);
- Put (File, WT.Table (Reduced (J)), F1, L1, J, 1, 3, 3);
+ Put (File, Trim_Trailing_Nuls (WT.Table (Reduced (J)).all),
+ F1, L1, J, 1, 3, 3);
end loop;
end Put_Reduced_Keys;
Q := Seed / 127773;
X := 16807 * R - 2836 * Q;
- if X < 0 then
- Seed := X + 2147483647;
- else
- Seed := X;
- end if;
+ Seed := (if X < 0 then X + 2147483647 else X);
end Random;
-------------
return K + NK + 1;
end Reduced;
+ -----------------
+ -- Resize_Word --
+ -----------------
+
+ procedure Resize_Word (W : in out Word_Type; Len : Natural) is
+ S1 : constant String := W.all;
+ S2 : String (1 .. Len) := (others => ASCII.NUL);
+ L : constant Natural := S1'Length;
+ begin
+ if L /= Len then
+ Free_Word (W);
+ S2 (1 .. L) := S1;
+ W := New_Word (S2);
+ end if;
+ end Resize_Word;
+
--------------------------
-- Select_Char_Position --
--------------------------
begin
if L = 0 then
- Left := Reduced (0) - 1;
+ Left := NK;
Right := Offset + R;
elsif R = 0 then
Left := Offset + L;
- Right := Reduced (0) - 1;
+ Right := NK;
else
Left := Offset + L;
Right := Offset + R;
begin
if From = 0 then
- Source := Reduced (0) - 1;
+ Source := NK;
Target := Offset + To;
elsif To = 0 then
Source := Offset + From;
- Target := Reduced (0) - 1;
+ Target := NK;
else
Source := Offset + From;
Target := Offset + To;
end if;
WT.Table (Target) := WT.Table (Source);
+ WT.Table (Source) := null;
end Move;
package Sorting is new GNAT.Heap_Sort_G (Move, Lt);
begin
-- Initialize the reduced words set
- WT.Set_Last (2 * NK);
for K in 0 .. NK - 1 loop
- WT.Table (Reduced (K)) := WT.Table (Initial (K));
+ WT.Table (Reduced (K)) := New_Word (WT.Table (Initial (K)).all);
end loop;
declare
loop
-- Preserve maximum number of different keys and check later on
-- that this value is strictly incrementing. Otherwise, it means
- -- that two keys are stricly identical.
+ -- that two keys are strictly identical.
Old_Differences := Max_Differences;
-- The first position should not exceed the minimum key length.
-- Otherwise, we may end up with an empty word once reduced.
- if Last_Sel_Pos = 0 then
- Max_Sel_Pos := Min_Key_Len;
- else
- Max_Sel_Pos := Max_Key_Len;
- end if;
+ Max_Sel_Pos :=
+ (if Last_Sel_Pos = 0 then Min_Key_Len else Max_Key_Len);
-- Find which position increases more the number of differences
end loop;
if Old_Differences = Max_Differences then
- Raise_Exception
- (Program_Error'Identity, "some keys are identical");
+ raise Program_Error with "some keys are identical";
end if;
-- Insert selected position and sort Sel_Position table
Same_Keys_Sets_Table (J).First ..
Same_Keys_Sets_Table (J).Last
loop
- Put (Output, WT.Table (Reduced (K)));
+ Put (Output,
+ Trim_Trailing_Nuls (WT.Table (Reduced (K)).all));
New_Line (Output);
end loop;
Put (Output, "--");
R : Natural;
begin
- if Opt = CPU_Time then
- for J in 0 .. T1_Len - 1 loop
- exit when Word (J + 1) = ASCII.NUL;
- R := Get_Table (Table, J, Get_Used_Char (Word (J + 1)));
- S := (S + R) mod NV;
- end loop;
+ case Opt is
+ when CPU_Time =>
+ for J in 0 .. T1_Len - 1 loop
+ exit when Word (J + 1) = ASCII.NUL;
+ R := Get_Table (Table, J, Get_Used_Char (Word (J + 1)));
+ S := (S + R) mod NV;
+ end loop;
- else
- for J in 0 .. T1_Len - 1 loop
- exit when Word (J + 1) = ASCII.NUL;
- R := Get_Table (Table, J, 0);
- S := (S + R * Character'Pos (Word (J + 1))) mod NV;
- end loop;
- end if;
+ when Memory_Space =>
+ for J in 0 .. T1_Len - 1 loop
+ exit when Word (J + 1) = ASCII.NUL;
+ R := Get_Table (Table, J, 0);
+ S := (S + R * Character'Pos (Word (J + 1))) mod NV;
+ end loop;
+ end case;
return S;
end Sum;
+ ------------------------
+ -- Trim_Trailing_Nuls --
+ ------------------------
+
+ function Trim_Trailing_Nuls (Str : String) return String is
+ begin
+ for J in reverse Str'Range loop
+ if Str (J) /= ASCII.NUL then
+ return Str (Str'First .. J);
+ end if;
+ end loop;
+
+ return Str;
+ end Trim_Trailing_Nuls;
+
---------------
-- Type_Size --
---------------
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