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with
Ada.Strings.Unbounded;
package Packrat is
Parse_Error : exception;
package Errors is
subtype Error_Message is String
with Dynamic_Predicate => Valid_Message (Error_Message);
type Error_Info is record
Symbol : Ada.Strings.Unbounded.Unbounded_String;
Position : Natural;
end record;
type Error_Info_Array is array (Positive range <>) of Error_Info;
-- Note: No consideration is given to ordering of Error_Info items
-- encoded into an Error_Message string.
-- Note: Using "&" to join two Valid Error_Messages together
-- will result in an Error_Message that is also Valid,
-- but for best results Join should be used instead to
-- prevent duplication of Error_Info in the message.
function Valid_Identifier
(Check : in String)
return Boolean;
function Valid_Identifier
(Check : in Ada.Strings.Unbounded.Unbounded_String)
return Boolean;
function Valid_Identifier_Array
(Check : in Error_Info_Array)
return Boolean;
function Valid_Message
(Check : in String)
return Boolean;
function Join
(Left, Right : in Error_Message)
return Error_Message;
function Encode
(Name : in String;
Pos : in Natural)
return Error_Message
with Pre => Valid_Identifier (Name);
function Encode
(Name : in Ada.Strings.Unbounded.Unbounded_String;
Pos : in Natural)
return Error_Message
with Pre => Valid_Identifier (Name);
function Encode
(Info : in Error_Info)
return Error_Message
with Pre => Valid_Identifier (Info.Symbol);
function Encode_Array
(Info : in Error_Info_Array)
return Error_Message
with Pre => Valid_Identifier_Array (Info);
function Decode
(Msg : in Error_Message)
return Error_Info_Array;
end Errors;
private
end Packrat;
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