diff options
Diffstat (limited to 'src/packrat-lexer.adb')
| -rw-r--r-- | src/packrat-lexer.adb | 142 |
1 files changed, 57 insertions, 85 deletions
diff --git a/src/packrat-lexer.adb b/src/packrat-lexer.adb index faf8f71..256341e 100644 --- a/src/packrat-lexer.adb +++ b/src/packrat-lexer.adb @@ -57,7 +57,8 @@ package body Packrat.Lexer is end if; else Context.Status := Current_Result.Status; - Context.Pass_Forward.Replace_Element (Input (Context.Position .. Current_Result.Finish)); + Context.Pass_Forward.Replace_Element + (Input (Context.Position .. Current_Result.Finish)); Context.Empty_Labels.Clear; end if; @@ -98,7 +99,8 @@ package body Packrat.Lexer is end if; else Context.Status := Current_Result.Status; - Context.Pass_Forward.Replace_Element (Input (Context.Position .. Current_Result.Finish)); + Context.Pass_Forward.Replace_Element + (Input (Context.Position .. Current_Result.Finish)); Context.Empty_Labels.Clear; end if; @@ -114,7 +116,7 @@ package body Packrat.Lexer is (Details : in out Lexer_Context; Number_Comp : in Ada.Containers.Count_Type) is begin - Details.Pass_Forward := Input_Holders.Empty_Holder; + Details.Pass_Forward.Clear; Details.Empty_Labels.Clear; Details.Error_Labels.Clear; @@ -178,30 +180,21 @@ package body Packrat.Lexer is return Gen_Tokens.Token_Array is Real_Input : Input_Holders.Holder; - Raise_Error : Boolean; begin if not Context.Pass_Forward.Is_Empty then - Real_Input := Input_Holders.To_Holder (Context.Pass_Forward.Element & Input); + Real_Input.Replace_Element (Context.Pass_Forward.Element & Input); else - Real_Input := Input_Holders.To_Holder (Input); + Real_Input.Replace_Element (Input); end if; Tidy_Context (Context, Components'Length); Context.Result_So_Far.Clear; Context.Allow_Incomplete := Input'Length > 0; - while Context.Status = Success and Context.Position <= Real_Input.Constant_Reference.Element'Length loop - Raise_Error := True; - for C of Components loop - if C (Real_Input.Element, Context) = Component_Success then - Raise_Error := False; - exit; - end if; - end loop; - if Raise_Error then - Raise_Lexer_Error (Context.Error_Labels, Context.Position); - end if; + while Context.Status = Success and Context.Position <= Real_Input.Element'Length loop + Internal_Scan_Core (Real_Input.Element, Context, Components); end loop; + return Token_Vector_To_Array (Context.Result_So_Far); end Scan; @@ -212,30 +205,21 @@ package body Packrat.Lexer is return Gen_Tokens.Token_Array is Real_Input : Input_Holders.Holder; - Raise_Error : Boolean; begin if not Context.Pass_Forward.Is_Empty then - Real_Input := Input_Holders.To_Holder (Context.Pass_Forward.Element & Input); + Real_Input.Replace_Element (Context.Pass_Forward.Element & Input); else - Real_Input := Input_Holders.To_Holder (Input); + Real_Input.Replace_Element (Input); end if; Tidy_Context (Context, Components'Length); Context.Result_So_Far.Clear; Context.Allow_Incomplete := False; - while Context.Status = Success and Context.Position <= Real_Input.Constant_Reference.Element'Length loop - Raise_Error := True; - for C of Components loop - if C (Real_Input.Element, Context) = Component_Success then - Raise_Error := False; - exit; - end if; - end loop; - if Raise_Error then - Raise_Lexer_Error (Context.Error_Labels, Context.Position); - end if; + while Context.Status = Success and Context.Position <= Real_Input.Element'Length loop + Internal_Scan_Core (Real_Input.Element, Context, Components); end loop; + return Token_Vector_To_Array (Context.Result_So_Far); end Scan_Only; @@ -246,30 +230,21 @@ package body Packrat.Lexer is return Gen_Tokens.Token_Array is Real_Input : Input_Holders.Holder; - Empty_Input, Raise_Error : Boolean; + Empty_Input : Boolean; begin Context.Result_So_Far.Clear; loop - Real_Input := Input_Holders.To_Holder (Input.all); - Empty_Input := Real_Input.Constant_Reference.Element'Length = 0; + Real_Input.Replace_Element (Input.all); + Empty_Input := Real_Input.Element'Length = 0; if not Context.Pass_Forward.Is_Empty then - Real_Input := Input_Holders.To_Holder (Context.Pass_Forward.Element & Real_Input.Element); + Real_Input.Replace_Element (Context.Pass_Forward.Element & Real_Input.Element); end if; Tidy_Context (Context, Components'Length); Context.Allow_Incomplete := not Empty_Input; - while Context.Status = Success and Context.Position <= Real_Input.Constant_Reference.Element'Length loop - Raise_Error := True; - for C of Components loop - if C (Real_Input.Element, Context) = Component_Success then - Raise_Error := False; - exit; - end if; - end loop; - if Raise_Error then - Raise_Lexer_Error (Context.Error_Labels, Context.Position); - end if; + while Context.Status = Success and Context.Position <= Real_Input.Element'Length loop + Internal_Scan_Core (Real_Input.Element, Context, Components); end loop; if Empty_Input then @@ -286,12 +261,11 @@ package body Packrat.Lexer is Output : out Gen_Tokens.Token_Array) is Real_Input : Input_Holders.Holder; - Raise_Error : Boolean; begin if not Context.Pass_Forward.Is_Empty then - Real_Input := Input_Holders.To_Holder (Context.Pass_Forward.Element & Input); + Real_Input.Replace_Element (Context.Pass_Forward.Element & Input); else - Real_Input := Input_Holders.To_Holder (Input); + Real_Input.Replace_Element (Input); end if; Tidy_Context (Context, Components'Length); @@ -300,26 +274,16 @@ package body Packrat.Lexer is while Context.Status = Success and then Integer (Context.Result_So_Far.Length) < Output'Length and then - Context.Position <= Real_Input.Constant_Reference.Element'Length and then - Real_Input.Constant_Reference.Element (Context.Position) /= Pad_In + Context.Position <= Real_Input.Element'Length and then + Real_Input.Element (Context.Position) /= Pad_In loop - Raise_Error := True; - for C of Components loop - if C (Real_Input.Element, Context) = Component_Success then - Raise_Error := False; - exit; - end if; - end loop; - if Raise_Error then - Raise_Lexer_Error (Context.Error_Labels, Context.Position); - end if; + Internal_Scan_Core (Real_Input.Element, Context, Components); end loop; - -- suspect this is wrong, test more - if Integer (Context.Result_So_Far.Length) >= Output'Length then - Context.Pass_Forward.Replace_Element (Real_Input.Element (Context.Position .. Real_Input.Element'Last)); + if Integer (Context.Result_So_Far.Length) = Output'Length then + Context.Pass_Forward.Replace_Element + (Real_Input.Element (Context.Position .. Real_Input.Element'Last)); end if; - Token_Vector_To_Array (Context.Result_So_Far, Pad_Out, Output); end Scan_Set; @@ -330,13 +294,13 @@ package body Packrat.Lexer is Output : out Gen_Tokens.Token_Array) is Real_Input : Input_Holders.Holder; - Empty_Input, Raise_Error : Boolean; + Empty_Input : Boolean; begin Context.Result_So_Far.Clear; loop - Real_Input := Input_Holders.To_Holder (Input.all); - Empty_Input := Real_Input.Constant_Reference.Element'Length = 0 or - Real_Input.Constant_Reference.Element (Real_Input.Constant_Reference.Element'First) = Pad_In; + Real_Input.Replace_Element (Input.all); + Empty_Input := Real_Input.Element'Length = 0 or + Real_Input.Element (Real_Input.Element'First) = Pad_In; if not Context.Pass_Forward.Is_Empty then Real_Input.Replace_Element (Context.Pass_Forward.Element & Real_Input.Element); end if; @@ -346,28 +310,19 @@ package body Packrat.Lexer is while Context.Status = Success and then Integer (Context.Result_So_Far.Length) < Output'Length and then - Context.Position <= Real_Input.Constant_Reference.Element'Length and then - Real_Input.Constant_Reference.Element (Context.Position) /= Pad_In + Context.Position <= Real_Input.Element'Length and then + Real_Input.Element (Context.Position) /= Pad_In loop - Raise_Error := True; - for C of Components loop - if C (Real_Input.Element, Context) = Component_Success then - Raise_Error := False; - exit; - end if; - end loop; - if Raise_Error then - Raise_Lexer_Error (Context.Error_Labels, Context.Position); - end if; + Internal_Scan_Core (Real_Input.Element, Context, Components); end loop; if Empty_Input then exit; end if; - -- suspect this is wrong, test more - if Integer (Context.Result_So_Far.Length) >= Output'Length then - Context.Pass_Forward.Replace_Element (Real_Input.Element (Context.Position .. Real_Input.Element'Last)); + if Integer (Context.Result_So_Far.Length) = Output'Length then + Context.Pass_Forward.Replace_Element + (Real_Input.Element (Context.Position .. Real_Input.Element'Last)); exit; end if; end loop; @@ -375,7 +330,24 @@ package body Packrat.Lexer is end Scan_Set_With; - -- factor out the internal scan loop to an internal function/procedure here + procedure Internal_Scan_Core + (Input : in Element_Array; + Context : in out Lexer_Context; + Components : in Component_Array) + is + Raise_Error : Boolean; + begin + Raise_Error := True; + for C of Components loop + if C (Input, Context) = Component_Success then + Raise_Error := False; + exit; + end if; + end loop; + if Raise_Error then + Raise_Lexer_Error (Context.Error_Labels, Context.Position); + end if; + end Internal_Scan_Core; |