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with
Ada.Strings.Unbounded,
Ada.Finalization;
package Packrat is
type Result_Status is (Failure, Needs_More, Optional_More, Success);
Parser_Error : exception;
Lexer_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 Debug_String
(This : in Error_Message)
return String;
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;
generic
type Label_Enum is (<>);
type Element is private;
type Element_Array is array (Positive range <>) of Element;
package Tokens is
type Token is new Ada.Finalization.Controlled with private;
type Token_Array is array (Positive range <>) of Token;
function Create
(Ident : in Label_Enum;
Start : in Positive;
Finish : in Natural;
Value : in Element_Array)
return Token;
function "="
(Left, Right : in Token)
return Boolean;
-- Note: The Start and Finish indices indicate where the token was found
-- in whatever array it was lexed from. The Value does *not* have
-- to correspond with whatever is found in the Start .. Finish range.
function Initialized
(This : in Token)
return Boolean;
function Debug_String
(This : in Token)
return String;
function Label
(This : in Token)
return Label_Enum
with Pre => Initialized (This);
function Start
(This : in Token)
return Positive;
function Finish
(This : in Token)
return Natural;
function Value
(This : in Token)
return Element_Array
with Pre => Initialized (This);
private
type Element_Array_Access is access Element_Array;
type Token is new Ada.Finalization.Controlled with record
Identifier : Label_Enum;
Start_At : Positive;
Finish_At : Natural;
Token_Value : Element_Array_Access;
end record;
overriding procedure Initialize
(This : in out Token);
overriding procedure Adjust
(This : in out Token);
overriding procedure Finalize
(This : in out Token);
end Tokens;
private
function "+"
(S : in String)
return Ada.Strings.Unbounded.Unbounded_String
renames Ada.Strings.Unbounded.To_Unbounded_String;
function "-"
(US : in Ada.Strings.Unbounded.Unbounded_String)
return String
renames Ada.Strings.Unbounded.To_String;
end Packrat;
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