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with
Ada.Strings.Fixed,
Ada.Characters.Handling,
Ada.Characters.Latin_1;
package body Packrat.Errors is
package SU renames Ada.Strings.Unbounded;
package SF renames Ada.Strings.Fixed;
package CH renames Ada.Characters.Handling;
package Latin renames Ada.Characters.Latin_1;
function Image
(Num : in Natural)
return String
is
Raw : String := Integer'Image (Num);
begin
return Raw (Raw'First + 1 .. Raw'Last);
end Image;
function Is_Upper
(Char : in Character)
return Boolean is
begin
return Char >= 'A' and Char <= 'Z';
end Is_Upper;
function Is_Lower
(Char : in Character)
return Boolean is
begin
return Char >= 'a' and Char <= 'z';
end Is_Lower;
function Is_Letter
(Char : in Character)
return Boolean is
begin
return Is_Upper (Char) or Is_Lower (Char);
end Is_Letter;
function Is_Digit
(Char : in Character)
return Boolean is
begin
return Char >= '0' and Char <= '9';
end Is_Digit;
generic
Message : in String;
package Parts is
function Length
return Natural;
procedure Reset_Position;
procedure Set_Position
(To : in Positive);
procedure Next_ID_Token
(Start : out Positive;
Finish : out Natural);
procedure Next_Pos_Token
(Start : out Positive;
Finish : out Natural);
procedure Next_Full_Token
(Start : out Positive;
Finish : out Natural);
end Parts;
package body Parts is separate;
function Valid_Identifier
(Check : in String)
return Boolean
is
All_Digit : Boolean;
begin
if Check'Length < 1 then
return False;
end if;
-- Have to relax requirements to allow Integers and such
-- since there is no way to require a generic parameter to
-- *only* be an enumeration.
All_Digit := True;
for N in Integer range Check'First .. Check'Last loop
if not Is_Digit (Check (N)) then
All_Digit := False;
exit;
end if;
end loop;
if All_Digit then
return True;
end if;
-- Regular checks for a valid identifier.
if not Is_Letter (Check (Check'First)) then
return False;
end if;
for N in Integer range Check'First + 1 .. Check'Last - 1 loop
if not Is_Letter (Check (N)) and
not Is_Digit (Check (N)) and
Check (N) /= '_'
then
return False;
end if;
if Check (N) = '_' and
((not Is_Letter (Check (N - 1)) and not Is_Digit (Check (N - 1))) or
(not Is_Letter (Check (N + 1)) and not Is_Digit (Check (N + 1))))
then
return False;
end if;
end loop;
if not Is_Letter (Check (Check'Last)) and not Is_Digit (Check (Check'Last)) then
return False;
end if;
return True;
end Valid_Identifier;
function Valid_Identifier
(Check : in SU.Unbounded_String)
return Boolean is
begin
return Valid_Identifier (-Check);
end Valid_Identifier;
function Valid_Identifier_Array
(Check : in Error_Info_Array)
return Boolean is
begin
for EI of Check loop
if not Valid_Identifier (-EI.Symbol) then
return False;
end if;
end loop;
return True;
end Valid_Identifier_Array;
function Valid_Message
(Check : in String)
return Boolean
is
S_Place, P_Place : Natural := 1;
begin
while S_Place <= Check'Length loop
if Check (S_Place) /= 's' then
return False;
end if;
P_Place := SF.Index (Check, "p", S_Place);
if (P_Place < S_Place) then
return False;
end if;
declare
ID : String := Check (S_Place + 1 .. P_Place - 1);
begin
if not Valid_Identifier (ID) or ID /= CH.To_Upper (ID) then
return False;
end if;
end;
P_Place := P_Place + 1;
if P_Place > Check'Last or else not Is_Digit (Check (P_Place)) then
return False;
end if;
loop
P_Place := P_Place + 1;
exit when P_Place > Check'Last or else not Is_Digit (Check (P_Place));
end loop;
S_Place := P_Place;
end loop;
return True;
end Valid_Message;
function Debug_String
(This : in Error_Message)
return String
is
Result : SU.Unbounded_String := +"";
Info : Error_Info_Array := Decode (This);
begin
for E of Info loop
SU.Append (Result, "Expected " & (-E.Symbol) &
" at input position" & Integer'Image (E.Position) & Latin.LF);
end loop;
return -Result;
end Debug_String;
function Join
(Left, Right : in Error_Message)
return Error_Message
is
package Left_Parts is new Parts (Left);
package Right_Parts is new Parts (Right);
LS, LF, RS, RF : Natural;
Add : Boolean;
Result : SU.Unbounded_String := +Left;
begin
for R in Integer range 1 .. Right_Parts.Length loop
Add := True;
Right_Parts.Next_Full_Token (RS, RF);
for L in Integer range 1 .. Left_Parts.Length loop
Left_Parts.Next_Full_Token (LS, LF);
if Left (LS .. LF) = Right (RS .. RF) then
Add := False;
exit;
end if;
end loop;
if Add then
SU.Append (Result, +Right (RS .. RF));
end if;
Left_Parts.Reset_Position;
end loop;
return -Result;
end Join;
function Encode
(Name : in String;
Pos : in Natural)
return Error_Message is
begin
return "s" & CH.To_Upper (Name) & "p" & Image (Pos);
end Encode;
function Encode
(Name : in SU.Unbounded_String;
Pos : in Natural)
return Error_Message is
begin
return Encode (-Name, Pos);
end Encode;
function Encode
(Info : in Error_Info)
return Error_Message is
begin
return Encode (-Info.Symbol, Info.Position);
end Encode;
function Encode_Array
(Info : in Error_Info_Array)
return Error_Message
is
Result : SU.Unbounded_String := SU.To_Unbounded_String (0);
begin
for EI of Info loop
SU.Append (Result, (Encode (-EI.Symbol, EI.Position)));
end loop;
return -Result;
end Encode_Array;
function Decode
(Msg : in Error_Message)
return Error_Info_Array
is
package Msg_Parts is new Parts (Msg);
Result : Error_Info_Array (1 .. Msg_Parts.Length);
Start, Finish : Natural;
begin
for EI of Result loop
Msg_Parts.Next_ID_Token (Start, Finish);
EI.Symbol := +Msg (Start .. Finish);
Msg_Parts.Next_Pos_Token (Start, Finish);
EI.Position := Integer'Value (Msg (Start .. Finish));
end loop;
return Result;
end Decode;
end Packrat.Errors;
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