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with
Packrat.Traits;
private with
Ada.Containers.Vectors,
Ada.Containers.Ordered_Sets;
generic
with package Traits is new Packrat.Traits (<>);
package Packrat.Lexers is
type Lexer_Context is private;
type Combinator_Result is private;
type Combinator is access function
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
type Combinator_Array is array (Positive range <>) of Combinator;
type Component_Result is private;
type Component is access function
(Input : in Traits.Element_Array;
Context : in out Lexer_Context)
return Component_Result;
type Component_Array is array (Positive range <>) of Component;
type With_Input is access function
return Traits.Element_Array;
generic
Components : in Component_Array;
package Scan_Parts is
function Scan
(Input : in Traits.Element_Array)
return Traits.Tokens.Token_Array;
procedure Reset;
end Scan_Parts;
generic
Components : in Component_Array;
package Scan_Once is
function Scan
(Input : in Traits.Element_Array)
return Traits.Tokens.Token_Array;
procedure Reset;
end Scan_Once;
generic
Components : in Component_Array;
package Scan_With is
function Scan
(Input : in With_Input)
return Traits.Tokens.Token_Array;
procedure Reset;
end Scan_With;
generic
Components : in Component_Array;
Pad_In : in Traits.Element_Type;
Pad_Out : in Traits.Tokens.Token_Type;
package Scan_Set is
procedure Scan
(Input : in Traits.Element_Array;
Output : out Traits.Tokens.Token_Array);
procedure Reset;
end Scan_Set;
generic
Components : in Component_Array;
Pad_In : in Traits.Element_Type;
Pad_Out : in Traits.Tokens.Token_Type;
package Scan_Set_With is
procedure Scan
(Input : in With_Input;
Output : out Traits.Tokens.Token_Array);
procedure Reset;
end Scan_Set_With;
generic
Label : in Traits.Label_Enum;
with function Combo
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
function Stamp
(Input : in Traits.Element_Array;
Context : in out Lexer_Context)
return Component_Result;
generic
Label : in Traits.Label_Enum;
with function Combo
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
function Ignore
(Input : in Traits.Element_Array;
Context : in out Lexer_Context)
return Component_Result;
generic
Params : in Combinator_Array;
function Sequence
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
with function Param
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
Number : in Positive;
function Count
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
with function Param
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
Minimum : in Natural := 0;
function Many
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
with function Param
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
with function Test
(Item : in Traits.Element_Type)
return Boolean;
Minimum : in Natural := 0;
function Many_Until
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
with function Test
(Item : in Traits.Element_Type)
return Boolean;
function Satisfy
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
with function Test
(Item : in Traits.Element_Type)
return Boolean;
with function Change
(From : in Traits.Element_Type)
return Traits.Element_Type;
function Satisfy_With
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
Item : in Traits.Element_Type;
function Match
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
Item : in Traits.Element_Type;
with function Change
(From : in Traits.Element_Type)
return Traits.Element_Type;
function Match_With
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
Items : in Traits.Element_Array;
function Multimatch
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
Number : in Positive := 1;
function Take
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
with function Test
(Item : in Traits.Element_Type)
return Boolean;
function Take_While
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
with function Test
(Item : in Traits.Element_Type)
return Boolean;
function Take_Until
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
EOL_Item : in Traits.Element_Type;
function Line_End
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
generic
EOF_Item : in Traits.Element_Type;
function Input_End
(Input : in Traits.Element_Array;
Start : in Positive)
return Combinator_Result;
private
use type Traits.Label_Enum;
use type Traits.Element_Type;
use type Traits.Element_Array;
package Token_Vectors is new Ada.Containers.Vectors
(Index_Type => Positive,
Element_Type => Traits.Tokens.Token_Type,
"=" => Traits.Tokens."=");
package Label_Vectors is new Ada.Containers.Vectors
(Index_Type => Positive,
Element_Type => Traits.Label_Enum);
package Label_Sets is new Ada.Containers.Ordered_Sets
(Element_Type => Traits.Label_Enum);
package Input_Holders is new Ada.Containers.Indefinite_Holders
(Element_Type => Traits.Element_Array);
type Combinator_Result is record
Finish : Natural;
Status : Result_Status;
end record;
Empty_Fail : constant Combinator_Result :=
(Finish => 0,
Status => Failure);
type Component_Result is (Component_Failure, Component_Success);
type Lexer_Context is record
Result_So_Far : Token_Vectors.Vector;
Position : Positive := 1;
Offset : Natural := 0;
Status : Result_Status := Success;
Pass_Forward : Input_Holders.Holder;
Empty_Labels : Label_Sets.Set;
Error_Labels : Label_Vectors.Vector;
Allow_Incomplete : Boolean := True;
end record;
Empty_Context : constant Lexer_Context :=
(Result_So_Far => Token_Vectors.Empty_Vector,
Position => 1,
Offset => 0,
Status => Success,
Pass_Forward => Input_Holders.Empty_Holder,
Empty_Labels => Label_Sets.Empty_Set,
Error_Labels => Label_Vectors.Empty_Vector,
Allow_Incomplete => True);
end Packrat.Lexers;
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