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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- O U T P U T --
--- --
--- B o d y --
--- --
--- Copyright (C) 1992-2010, 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. --
--- --
-------------------------------------------------------------------------------
-
-package body Output is
-
- Current_FD : File_Descriptor := Standout;
- -- File descriptor for current output
-
- Special_Output_Proc : Output_Proc := null;
- -- Record argument to last call to Set_Special_Output. If this is
- -- non-null, then we are in special output mode.
-
- Indentation_Amount : constant Positive := 3;
- -- Number of spaces to output for each indentation level
-
- Indentation_Limit : constant Positive := 40;
- -- Indentation beyond this number of spaces wraps around
-
- pragma Assert (Indentation_Limit < Buffer_Max / 2);
- -- Make sure this is substantially shorter than the line length
-
- Cur_Indentation : Natural := 0;
- -- Number of spaces to indent each line
-
- -----------------------
- -- Local_Subprograms --
- -----------------------
-
- procedure Flush_Buffer;
- -- Flush buffer if non-empty and reset column counter
-
- ---------------------------
- -- Cancel_Special_Output --
- ---------------------------
-
- procedure Cancel_Special_Output is
- begin
- Special_Output_Proc := null;
- end Cancel_Special_Output;
-
- ------------
- -- Column --
- ------------
-
- function Column return Pos is
- begin
- return Pos (Next_Col);
- end Column;
-
- ------------------
- -- Flush_Buffer --
- ------------------
-
- procedure Flush_Buffer is
- Write_Error : exception;
- -- Raised if Write fails
-
- ------------------
- -- Write_Buffer --
- ------------------
-
- procedure Write_Buffer (Buf : String);
- -- Write out Buf, either using Special_Output_Proc, or the normal way
- -- using Write. Raise Write_Error if Write fails (presumably due to disk
- -- full). Write_Error is not used in the case of Special_Output_Proc.
-
- procedure Write_Buffer (Buf : String) is
- begin
- -- If Special_Output_Proc has been set, then use it
-
- if Special_Output_Proc /= null then
- Special_Output_Proc.all (Buf);
-
- -- If output is not set, then output to either standard output
- -- or standard error.
-
- elsif Write (Current_FD, Buf'Address, Buf'Length) /= Buf'Length then
- raise Write_Error;
-
- end if;
- end Write_Buffer;
-
- Len : constant Natural := Next_Col - 1;
-
- -- Start of processing for Flush_Buffer
-
- begin
- if Len /= 0 then
- begin
- -- If there's no indentation, or if the line is too long with
- -- indentation, or if it's a blank line, just write the buffer.
-
- if Cur_Indentation = 0
- or else Cur_Indentation + Len > Buffer_Max
- or else Buffer (1 .. Len) = (1 => ASCII.LF)
- then
- Write_Buffer (Buffer (1 .. Len));
-
- -- Otherwise, construct a new buffer with preceding spaces, and
- -- write that.
-
- else
- declare
- Indented_Buffer : constant String :=
- (1 .. Cur_Indentation => ' ') &
- Buffer (1 .. Len);
- begin
- Write_Buffer (Indented_Buffer);
- end;
- end if;
-
- exception
- when Write_Error =>
-
- -- If there are errors with standard error just quit. Otherwise
- -- set the output to standard error before reporting a failure
- -- and quitting.
-
- if Current_FD /= Standerr then
- Current_FD := Standerr;
- Next_Col := 1;
- Write_Line ("fatal error: disk full");
- end if;
-
- OS_Exit (2);
- end;
-
- -- Buffer is now empty
-
- Next_Col := 1;
- end if;
- end Flush_Buffer;
-
- -------------------
- -- Ignore_Output --
- -------------------
-
- procedure Ignore_Output (S : String) is
- begin
- null;
- end Ignore_Output;
-
- ------------
- -- Indent --
- ------------
-
- procedure Indent is
- begin
- -- The "mod" in the following assignment is to cause a wrap around in
- -- the case where there is too much indentation.
-
- Cur_Indentation :=
- (Cur_Indentation + Indentation_Amount) mod Indentation_Limit;
- end Indent;
-
- -------------
- -- Outdent --
- -------------
-
- procedure Outdent is
- begin
- -- The "mod" here undoes the wrap around from Indent above
-
- Cur_Indentation :=
- (Cur_Indentation - Indentation_Amount) mod Indentation_Limit;
- end Outdent;
-
- ---------------------------
- -- Restore_Output_Buffer --
- ---------------------------
-
- procedure Restore_Output_Buffer (S : Saved_Output_Buffer) is
- begin
- Next_Col := S.Next_Col;
- Cur_Indentation := S.Cur_Indentation;
- Buffer (1 .. Next_Col - 1) := S.Buffer (1 .. Next_Col - 1);
- end Restore_Output_Buffer;
-
- ------------------------
- -- Save_Output_Buffer --
- ------------------------
-
- function Save_Output_Buffer return Saved_Output_Buffer is
- S : Saved_Output_Buffer;
- begin
- S.Buffer (1 .. Next_Col - 1) := Buffer (1 .. Next_Col - 1);
- S.Next_Col := Next_Col;
- S.Cur_Indentation := Cur_Indentation;
- Next_Col := 1;
- Cur_Indentation := 0;
- return S;
- end Save_Output_Buffer;
-
- ------------------------
- -- Set_Special_Output --
- ------------------------
-
- procedure Set_Special_Output (P : Output_Proc) is
- begin
- Special_Output_Proc := P;
- end Set_Special_Output;
-
- ----------------
- -- Set_Output --
- ----------------
-
- procedure Set_Output (FD : File_Descriptor) is
- begin
- if Special_Output_Proc = null then
- Flush_Buffer;
- end if;
-
- Current_FD := FD;
- end Set_Output;
-
- ------------------------
- -- Set_Standard_Error --
- ------------------------
-
- procedure Set_Standard_Error is
- begin
- Set_Output (Standerr);
- end Set_Standard_Error;
-
- -------------------------
- -- Set_Standard_Output --
- -------------------------
-
- procedure Set_Standard_Output is
- begin
- Set_Output (Standout);
- end Set_Standard_Output;
-
- -------
- -- w --
- -------
-
- procedure w (C : Character) is
- begin
- Write_Char (''');
- Write_Char (C);
- Write_Char (''');
- Write_Eol;
- end w;
-
- procedure w (S : String) is
- begin
- Write_Str (S);
- Write_Eol;
- end w;
-
- procedure w (V : Int) is
- begin
- Write_Int (V);
- Write_Eol;
- end w;
-
- procedure w (B : Boolean) is
- begin
- if B then
- w ("True");
- else
- w ("False");
- end if;
- end w;
-
- procedure w (L : String; C : Character) is
- begin
- Write_Str (L);
- Write_Char (' ');
- w (C);
- end w;
-
- procedure w (L : String; S : String) is
- begin
- Write_Str (L);
- Write_Char (' ');
- w (S);
- end w;
-
- procedure w (L : String; V : Int) is
- begin
- Write_Str (L);
- Write_Char (' ');
- w (V);
- end w;
-
- procedure w (L : String; B : Boolean) is
- begin
- Write_Str (L);
- Write_Char (' ');
- w (B);
- end w;
-
- ----------------
- -- Write_Char --
- ----------------
-
- procedure Write_Char (C : Character) is
- begin
- if Next_Col = Buffer'Length then
- Write_Eol;
- end if;
-
- if C = ASCII.LF then
- Write_Eol;
- else
- Buffer (Next_Col) := C;
- Next_Col := Next_Col + 1;
- end if;
- end Write_Char;
-
- ---------------
- -- Write_Eol --
- ---------------
-
- procedure Write_Eol is
- begin
- -- Remove any trailing space
-
- while Next_Col > 1 and then Buffer (Next_Col - 1) = ' ' loop
- Next_Col := Next_Col - 1;
- end loop;
-
- Buffer (Next_Col) := ASCII.LF;
- Next_Col := Next_Col + 1;
- Flush_Buffer;
- end Write_Eol;
-
- ---------------------------
- -- Write_Eol_Keep_Blanks --
- ---------------------------
-
- procedure Write_Eol_Keep_Blanks is
- begin
- Buffer (Next_Col) := ASCII.LF;
- Next_Col := Next_Col + 1;
- Flush_Buffer;
- end Write_Eol_Keep_Blanks;
-
- ----------------------
- -- Write_Erase_Char --
- ----------------------
-
- procedure Write_Erase_Char (C : Character) is
- begin
- if Next_Col /= 1 and then Buffer (Next_Col - 1) = C then
- Next_Col := Next_Col - 1;
- end if;
- end Write_Erase_Char;
-
- ---------------
- -- Write_Int --
- ---------------
-
- procedure Write_Int (Val : Int) is
- begin
- if Val < 0 then
- Write_Char ('-');
- Write_Int (-Val);
-
- else
- if Val > 9 then
- Write_Int (Val / 10);
- end if;
-
- Write_Char (Character'Val ((Val mod 10) + Character'Pos ('0')));
- end if;
- end Write_Int;
-
- ----------------
- -- Write_Line --
- ----------------
-
- procedure Write_Line (S : String) is
- begin
- Write_Str (S);
- Write_Eol;
- end Write_Line;
-
- ------------------
- -- Write_Spaces --
- ------------------
-
- procedure Write_Spaces (N : Nat) is
- begin
- for J in 1 .. N loop
- Write_Char (' ');
- end loop;
- end Write_Spaces;
-
- ---------------
- -- Write_Str --
- ---------------
-
- procedure Write_Str (S : String) is
- begin
- for J in S'Range loop
- Write_Char (S (J));
- end loop;
- end Write_Str;
-
-end Output;