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package Dict_Sources is
type Enum is
(S_Expression,
Text_List,
Unoptimized_Text_List);
end Dict_Sources;
package Methods is
type Enum is (Encoded, Frequency, Gain);
end Methods;
package Options is
type Id is
(Output_Ada_Dict,
Dictionary_Input,
Decode,
Encode,
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Max_Sub_Size,
Stat_Output,
No_Stat_Output,
Text_List_Input,
Fast_Text_Input,
Max_Word_Size,
Sx_Output,
No_Sx_Output);
No_Sx_Output,
Score_Method);
end Options;
package Getopt is new Natools.Getopt_Long (Options.Id);
type Callback is new Getopt.Handlers.Callback with record
Display_Help : Boolean := False;
Need_Dictionary : Boolean := False;
Stat_Output : Boolean := False;
Sx_Output : Boolean := False;
Sx_Dict_Output : Boolean := False;
Min_Sub_Size : Positive := 1;
Max_Sub_Size : Positive := 3;
Max_Word_Size : Positive := 10;
Job_Count : Natural := 0;
Filter_Threshold : Natools.Smaz.Tools.String_Count := 0;
Score_Method : Methods.Enum := Methods.Encoded;
Action : Actions.Enum := Actions.Nothing;
Ada_Dictionary : Ada.Strings.Unbounded.Unbounded_String;
Hash_Package : Ada.Strings.Unbounded.Unbounded_String;
Dict_Source : Dict_Sources.Enum := Dict_Sources.S_Expression;
end record;
overriding procedure Option
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Counts : out Natools.Smaz.Tools.Dictionary_Counts);
-- Dispatch to parallel or non-parallel version of Evaluate_Dictionary
-- depending on Job_Count.
function Getopt_Config return Getopt.Configuration;
-- Build the configuration object
procedure Optimization_Round
(Dict : in out Holders.Holder;
Score : in out Ada.Streams.Stream_Element_Count;
Counts : in out Natools.Smaz.Tools.Dictionary_Counts;
Pending_Words : in out Natools.Smaz.Tools.String_Lists.List;
Input_Texts : in Natools.Smaz.Tools.String_Lists.List;
Job_Count : in Natural;
Updated : out Boolean);
-- Try to improve on Dict by replacing a single entry from it with
-- one of the substring in Pending_Words.
Job_Count : in Natural)
Job_Count : in Natural;
Method : in Methods.Enum)
return Natools.Smaz.Dictionary;
-- Optimize the dictionary on Input_Texts, starting with Base and
-- adding substrings from Pending_Words.
procedure Parallel_Evaluate_Dictionary
(Job_Count : in Positive;
Dict : in Natools.Smaz.Dictionary;
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(Dictionary : in Natools.Smaz.Dictionary;
Counts : in Natools.Smaz.Tools.Dictionary_Counts;
E : Ada.Streams.Stream_Element)
return Score_Value
is (Score_Value (Counts (E)) * (Length (Dictionary, E) - 1));
-- Score value using the number of bytes saved using E
function Score
(Dictionary : in Natools.Smaz.Dictionary;
Counts : in Natools.Smaz.Tools.Dictionary_Counts;
E : in Ada.Streams.Stream_Element;
Method : in Methods.Enum)
return Score_Value
is (case Method is
when Methods.Encoded => Score_Encoded (Dictionary, Counts, E),
when Methods.Frequency => Score_Frequency (Dictionary, Counts, E),
when Methods.Gain => Score_Gain (Dictionary, Counts, E));
-- Scare value with dynamically chosen method
function To_Dictionary
(Handler : in Callback'Class;
Input : in Natools.Smaz.Tools.String_Lists.List)
return Natools.Smaz.Dictionary;
-- Convert the input into a dictionary given the option in Handler
function Worst_Index
(Dict : in Natools.Smaz.Dictionary;
Counts : in Natools.Smaz.Tools.Dictionary_Counts)
Counts : in Natools.Smaz.Tools.Dictionary_Counts;
Method : in Methods.Enum)
return Ada.Streams.Stream_Element;
-- Remove the worstly-scored item from Dict
overriding procedure Option
(Handler : in out Callback;
Id : in Options.Id;
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when Options.Job_Count =>
Handler.Job_Count := Natural'Value (Argument);
when Options.Filter_Threshold =>
Handler.Filter_Threshold
:= Natools.Smaz.Tools.String_Count'Value (Argument);
when Options.Score_Method =>
Handler.Score_Method := Methods.Enum'Value (Argument);
end case;
end Option;
procedure Evaluate_Dictionary
(Job_Count : in Natural;
Dict : in Natools.Smaz.Dictionary;
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R.Add_Option ("stats", 's', No_Argument, Stat_Output);
R.Add_Option ("no-stats", 'S', No_Argument, No_Stat_Output);
R.Add_Option ("text-list", 't', No_Argument, Text_List_Input);
R.Add_Option ("fast-text-list", 'T', No_Argument, Fast_Text_Input);
R.Add_Option ("max-word-len", 'W', Required_Argument, Max_Word_Size);
R.Add_Option ("s-expr", 'x', No_Argument, Sx_Output);
R.Add_Option ("no-s-expr", 'X', No_Argument, No_Sx_Output);
R.Add_Option ("score-method", Required_Argument, Score_Method);
return R;
end Getopt_Config;
procedure Optimization_Round
(Dict : in out Holders.Holder;
Score : in out Ada.Streams.Stream_Element_Count;
Counts : in out Natools.Smaz.Tools.Dictionary_Counts;
Pending_Words : in out Natools.Smaz.Tools.String_Lists.List;
Input_Texts : in Natools.Smaz.Tools.String_Lists.List;
Job_Count : in Natural;
Method : in Methods.Enum;
Updated : out Boolean)
is
use type Ada.Streams.Stream_Element_Offset;
New_Value : Ada.Strings.Unbounded.Unbounded_String;
New_Position : Natools.Smaz.Tools.String_Lists.Cursor;
Worst_Index : constant Ada.Streams.Stream_Element
:= Smaz.Worst_Index (Dict.Element, Counts);
:= Smaz.Worst_Index (Dict.Element, Counts, Method);
Worst_Value : constant String
:= Natools.Smaz.Dict_Entry (Dict.Element, Worst_Index);
Worst_Count : constant Natools.Smaz.Tools.String_Count
:= Counts (Worst_Index);
Base : constant Natools.Smaz.Dictionary
:= Natools.Smaz.Tools.Remove_Element (Dict.Element, Worst_Index);
Old_Score : constant Ada.Streams.Stream_Element_Count := Score;
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end Optimization_Round;
function Optimize_Dictionary
(Base : in Natools.Smaz.Dictionary;
Pending_Words : in Natools.Smaz.Tools.String_Lists.List;
Input_Texts : in Natools.Smaz.Tools.String_Lists.List;
Job_Count : in Natural)
Job_Count : in Natural;
Method : in Methods.Enum)
return Natools.Smaz.Dictionary
is
Holder : Holders.Holder := Holders.To_Holder (Base);
Pending : Natools.Smaz.Tools.String_Lists.List := Pending_Words;
Score : Ada.Streams.Stream_Element_Count;
Counts : Natools.Smaz.Tools.Dictionary_Counts;
Running : Boolean := True;
begin
Evaluate_Dictionary (Job_Count, Base, Input_Texts, Score, Counts);
while Running loop
Optimization_Round
(Holder,
Score,
Counts,
Pending,
Input_Texts,
Job_Count,
Method,
Running);
end loop;
return Holder.Element;
end Optimize_Dictionary;
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when Options.Filter_Threshold =>
Put_Line (Output, " <threshold>");
Put_Line (Output, Indent & Indent
& "Before building a dictionary from substrings, remove");
Put_Line (Output, Indent & Indent
& "substrings whose count is below the threshold.");
when Options.Score_Method =>
Put_Line (Output, " <method>");
Put_Line (Output, Indent & Indent
& "Select heuristic method to replace dictionary items"
& " during optimization");
end case;
end loop;
end Print_Help;
function To_Dictionary
(Handler : in Callback'Class;
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Natools.Smaz.Tools.Simple_Dictionary_And_Pending
(Counter, 254, Selected, Pending);
return Optimize_Dictionary
(Natools.Smaz.Tools.To_Dictionary (Selected, True),
Pending,
Input,
Handler.Job_Count);
Handler.Job_Count,
Handler.Score_Method);
end;
else
return Natools.Smaz.Tools.To_Dictionary
(Natools.Smaz.Tools.Simple_Dictionary (Counter, 254),
True);
end if;
end;
end case;
end To_Dictionary;
function Worst_Index
(Dict : in Natools.Smaz.Dictionary;
Counts : in Natools.Smaz.Tools.Dictionary_Counts)
Counts : in Natools.Smaz.Tools.Dictionary_Counts;
Method : in Methods.Enum)
return Ada.Streams.Stream_Element
is
Result : Ada.Streams.Stream_Element := 0;
Worst_Score : Score_Value := Score_Encoded (Dict, Counts, 0);
S : Score_Value;
begin
for I in 1 .. Dict.Dict_Last loop
S := Score_Encoded (Dict, Counts, I);
S := Score (Dict, Counts, I, Method);
if S < Worst_Score then
Result := I;
Worst_Score := S;
end if;
end loop;
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