| ----------------------------------------------------------------------------- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- G N A T . R E W R I T E _ D A T A -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2014-2021, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with Ada.Unchecked_Conversion; |
| |
| package body GNAT.Rewrite_Data is |
| |
| use Ada; |
| |
| subtype SEO is Stream_Element_Offset; |
| |
| procedure Do_Output |
| (B : Buffer; |
| Data : Stream_Element_Array; |
| Output : not null access procedure (Data : Stream_Element_Array)); |
| -- Do the actual output. This ensures that we properly send the data |
| -- through linked rewrite buffers if any. |
| |
| ------------ |
| -- Create -- |
| ------------ |
| |
| function Create |
| (Pattern, Value : String; |
| Size : Stream_Element_Offset := 1_024) return Buffer |
| is |
| |
| subtype SP is String (1 .. Pattern'Length); |
| subtype SEAP is Stream_Element_Array (1 .. Pattern'Length); |
| |
| subtype SV is String (1 .. Value'Length); |
| subtype SEAV is Stream_Element_Array (1 .. Value'Length); |
| |
| function To_SEAP is new Unchecked_Conversion (SP, SEAP); |
| function To_SEAV is new Unchecked_Conversion (SV, SEAV); |
| |
| begin |
| -- Return result (can't be smaller than pattern) |
| |
| return B : Buffer |
| (SEO'Max (Size, SEO (Pattern'Length)), |
| SEO (Pattern'Length), |
| SEO (Value'Length)) |
| do |
| B.Pattern := To_SEAP (Pattern); |
| B.Value := To_SEAV (Value); |
| B.Pos_C := 0; |
| B.Pos_B := 0; |
| end return; |
| end Create; |
| |
| --------------- |
| -- Do_Output -- |
| --------------- |
| |
| procedure Do_Output |
| (B : Buffer; |
| Data : Stream_Element_Array; |
| Output : not null access procedure (Data : Stream_Element_Array)) |
| is |
| begin |
| if B.Next = null then |
| Output (Data); |
| else |
| Write (B.Next.all, Data, Output); |
| end if; |
| end Do_Output; |
| |
| ----------- |
| -- Flush -- |
| ----------- |
| |
| procedure Flush |
| (B : in out Buffer; |
| Output : not null access procedure (Data : Stream_Element_Array)) |
| is |
| begin |
| -- Flush output buffer |
| |
| if B.Pos_B > 0 then |
| Do_Output (B, B.Buffer (1 .. B.Pos_B), Output); |
| end if; |
| |
| -- Flush current buffer |
| |
| if B.Pos_C > 0 then |
| Do_Output (B, B.Current (1 .. B.Pos_C), Output); |
| end if; |
| |
| -- Flush linked buffer if any |
| |
| if B.Next /= null then |
| Flush (B.Next.all, Output); |
| end if; |
| |
| Reset (B); |
| end Flush; |
| |
| ---------- |
| -- Link -- |
| ---------- |
| |
| procedure Link (From : in out Buffer; To : Buffer_Ref) is |
| begin |
| From.Next := To; |
| end Link; |
| |
| ----------- |
| -- Reset -- |
| ----------- |
| |
| procedure Reset (B : in out Buffer) is |
| begin |
| B.Pos_B := 0; |
| B.Pos_C := 0; |
| |
| if B.Next /= null then |
| Reset (B.Next.all); |
| end if; |
| end Reset; |
| |
| ------------- |
| -- Rewrite -- |
| ------------- |
| |
| procedure Rewrite |
| (B : in out Buffer; |
| Input : not null access procedure |
| (Buffer : out Stream_Element_Array; |
| Last : out Stream_Element_Offset); |
| Output : not null access procedure (Data : Stream_Element_Array)) |
| is |
| Buffer : Stream_Element_Array (1 .. B.Size); |
| Last : Stream_Element_Offset; |
| |
| begin |
| Rewrite_All : loop |
| Input (Buffer, Last); |
| exit Rewrite_All when Last = 0; |
| Write (B, Buffer (1 .. Last), Output); |
| end loop Rewrite_All; |
| |
| Flush (B, Output); |
| end Rewrite; |
| |
| ---------- |
| -- Size -- |
| ---------- |
| |
| function Size (B : Buffer) return Natural is |
| begin |
| return Natural (B.Pos_B + B.Pos_C); |
| end Size; |
| |
| ----------- |
| -- Write -- |
| ----------- |
| |
| procedure Write |
| (B : in out Buffer; |
| Data : Stream_Element_Array; |
| Output : not null access procedure (Data : Stream_Element_Array)) |
| is |
| procedure Need_Space (Size : Stream_Element_Offset); |
| pragma Inline (Need_Space); |
| |
| ---------------- |
| -- Need_Space -- |
| ---------------- |
| |
| procedure Need_Space (Size : Stream_Element_Offset) is |
| begin |
| if B.Pos_B + Size > B.Size then |
| Do_Output (B, B.Buffer (1 .. B.Pos_B), Output); |
| B.Pos_B := 0; |
| end if; |
| end Need_Space; |
| |
| -- Start of processing for Write |
| |
| begin |
| if B.Size_Pattern = 0 then |
| Do_Output (B, Data, Output); |
| |
| else |
| for K in Data'Range loop |
| if Data (K) = B.Pattern (B.Pos_C + 1) then |
| |
| -- Store possible start of a match |
| |
| B.Pos_C := B.Pos_C + 1; |
| B.Current (B.Pos_C) := Data (K); |
| |
| else |
| -- Not part of pattern, if a start of a match was found, |
| -- remove it. |
| |
| if B.Pos_C /= 0 then |
| Need_Space (B.Pos_C); |
| |
| B.Buffer (B.Pos_B + 1 .. B.Pos_B + B.Pos_C) := |
| B.Current (1 .. B.Pos_C); |
| B.Pos_B := B.Pos_B + B.Pos_C; |
| B.Pos_C := 0; |
| end if; |
| |
| Need_Space (1); |
| B.Pos_B := B.Pos_B + 1; |
| B.Buffer (B.Pos_B) := Data (K); |
| end if; |
| |
| if B.Pos_C = B.Size_Pattern then |
| |
| -- The pattern is found |
| |
| Need_Space (B.Size_Value); |
| |
| B.Buffer (B.Pos_B + 1 .. B.Pos_B + B.Size_Value) := B.Value; |
| B.Pos_C := 0; |
| B.Pos_B := B.Pos_B + B.Size_Value; |
| end if; |
| end loop; |
| end if; |
| end Write; |
| |
| end GNAT.Rewrite_Data; |
