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with Ada.Strings.Unbounded;
with Ada.Strings.Maps;
package body Preferences is
package S renames Ada.Strings;
package SU renames Ada.Strings.Unbounded;
package SM renames Ada.Strings.Maps;
generic
type Range_Type is range <>;
type Array_Type is array (Range_Type) of Natural;
procedure Index_And_Count
(Input : in Array_Type;
Value : in Natural;
Index : out Range_Type;
Count : out Natural);
procedure Index_And_Count
(Input : in Array_Type;
Value : in Natural;
Index : out Range_Type;
Count : out Natural) is
begin
Count := 0;
for I in Range_Type loop
if Input (I) = Value then
Index := I;
Count := Count + 1;
end if;
end loop;
end Index_And_Count;
function Extract_Formal
(Above_Input : in Above_Pref_Array;
Formal_Prefs : out Preference_Array)
return Boolean
is
procedure Above_IC is new Index_And_Count
(Above_Range, Above_Pref_Array);
Extracted : Natural := 0;
Working_Index : Above_Range;
Working_Count : Natural;
Formal_Index : Preference_Range := Preference_Range'First;
begin
Formal_Prefs := (others => Candidates.No_Candidate);
Pref_Loop :
for I in Above_Range loop
Above_IC (Above_Input, Integer (I), Working_Index, Working_Count);
exit when Working_Count /= 1;
Extracted := Extracted + 1;
for C of Above_Ballot.Element (Integer (Working_Index)) loop
exit Pref_Loop when Formal_Index > Preference_Range'Last;
Formal_Prefs (Formal_Index) := C;
Formal_Index := Formal_Index + 1;
end loop;
end loop Pref_Loop;
return Extracted >= Min_Above_Line;
end Extract_Formal;
function Extract_Formal
(Below_Input : in Below_Pref_Array;
Formal_Prefs : out Preference_Array)
return Boolean
is
procedure Below_IC is new Index_And_Count
(Below_Range, Below_Pref_Array);
Extracted : Natural := 0;
Working_Index : Below_Range;
Working_Count : Natural;
Formal_Index : Preference_Range := Preference_Range'First;
begin
Formal_Prefs := (others => Candidates.No_Candidate);
if Formal_Index > Preference_Range'Last then
return Extracted >= Min_Below_Line;
end if;
for I in Below_Range loop
Below_IC (Below_Input, Integer (I), Working_Index, Working_Count);
exit when Working_Count /= 1;
Formal_Prefs (Formal_Index) := Below_Ballot.Element (Integer (Working_Index));
Extracted := Extracted + 1;
exit when Formal_Index = Preference_Range'Last;
Formal_Index := Formal_Index + 1;
end loop;
return Extracted >= Min_Below_Line;
end Extract_Formal;
function Mark
(Input : in SU.Unbounded_String;
Output : out Natural;
Remaining : out SU.Unbounded_String)
return Boolean is
begin
if SU.Length (Input) > 0 and then
(SU.Element (Input, 1) = '/' or else
SU.Element (Input, 1) = '*')
then
Output := 1;
Remaining := SU.Tail (Input, SU.Length (Input) - 1);
return True;
else
return False;
end if;
end Mark;
function Number
(Input : in SU.Unbounded_String;
Output : out Natural;
Remaining : out SU.Unbounded_String)
return Boolean
is
First, Last : Natural;
begin
SU.Find_Token (Input, SM.To_Set ("1234567890"), S.Inside, First, Last);
if First = 1 and Last > 0 then
Output := Integer'Value (SU.Slice (Input, First, Last));
Remaining := SU.Unbounded_Slice (Input, Last + 1, SU.Length (Input));
return True;
else
return False;
end if;
end Number;
function Comma
(Input : in SU.Unbounded_String;
Remaining : out SU.Unbounded_String)
return Boolean is
begin
if SU.Length (Input) > 0 and then
SU.Element (Input, 1) = ','
then
Remaining := SU.Tail (Input, SU.Length (Input) - 1);
return True;
else
return False;
end if;
end Comma;
generic
type Range_Type is range <>;
type Array_Type is array (Range_Type) of Natural;
function Raw_Prefs
(Input : in SU.Unbounded_String;
Output : out Array_Type;
Remaining : out SU.Unbounded_String)
return Boolean;
function Raw_Prefs
(Input : in SU.Unbounded_String;
Output : out Array_Type;
Remaining : out SU.Unbounded_String)
return Boolean
is
Working_Num : Natural;
Index : Range_Type := Range_Type'First;
This_In, This_Remaining : SU.Unbounded_String;
begin
Output := (others => 0);
if Index > Range_Type'Last then
Remaining := Input;
return True;
end if;
This_In := Input;
loop
if Number (This_In, Working_Num, This_Remaining) or else
Mark (This_In, Working_Num, This_Remaining)
then
Output (Index) := Working_Num;
else
This_Remaining := This_In;
end if;
exit when Index = Range_Type'Last;
Index := Index + 1;
if not Comma (This_Remaining, This_In) then
return False;
end if;
end loop;
Remaining := This_Remaining;
return True;
end Raw_Prefs;
procedure Optional_Line_Ending
(Input : in SU.Unbounded_String;
Remaining : out SU.Unbounded_String) is
begin
if SU.Length (Input) > 1 and then
SU.Slice (Input, 1, 2) = Character'Val (13) & Character'Val (10)
then
Remaining := SU.Tail (Input, SU.Length (Input) - 2);
elsif
SU.Length (Input) > 0 and then
(SU.Element (Input, 1) = Character'Val (13) or else
SU.Element (Input, 1) = Character'Val (10))
then
Remaining := SU.Tail (Input, SU.Length (Input) - 1);
else
Remaining := Input;
end if;
end Optional_Line_Ending;
function Parse_Preferences
(Input : in String)
return Preference_Array
is
use type SU.Unbounded_String;
Above_Line : Above_Pref_Array;
Below_Line : Below_Pref_Array;
function Parse_Above_Line is new Raw_Prefs
(Above_Range, Above_Pref_Array);
function Parse_Below_Line is new Raw_Prefs
(Below_Range, Below_Pref_Array);
Result : Preference_Array;
This_In, This_Remaining : SU.Unbounded_String;
begin
This_In := SU.To_Unbounded_String (Input);
if not Parse_Above_Line (This_In, Above_Line, This_Remaining) then
return Empty_Array;
end if;
if not Comma (This_Remaining, This_In) then
return Empty_Array;
end if;
if not Parse_Below_Line (This_In, Below_Line, This_Remaining) then
return Empty_Array;
end if;
Optional_Line_Ending (This_Remaining, This_In);
if SU.Length (This_In) > 0 then
return Empty_Array;
end if;
if Extract_Formal (Below_Line, Result) or else
Extract_Formal (Above_Line, Result)
then
return Result;
else
return Empty_Array;
end if;
end Parse_Preferences;
end Preferences;
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