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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- O U T P U T --
--- --
--- S p e c --
--- --
--- Copyright (C) 1992-2009, 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. --
--- --
-------------------------------------------------------------------------------
-
--- This package contains low level output routines used by the compiler
--- for writing error messages and informational output. It is also used
--- by the debug source file output routines (see Sprintf.Print_Eol).
-
-with Hostparm; use Hostparm;
-with Types; use Types;
-
-package Output is
- pragma Elaborate_Body;
-
- type Output_Proc is access procedure (S : String);
- -- This type is used for the Set_Special_Output procedure. If this
- -- procedure is called, then instead of lines being written to
- -- standard error or standard output, a call is made to the given
- -- procedure for each line, passing the line with an end of line
- -- character (which is a single ASCII.LF character, even in systems
- -- which normally use CR/LF or some other sequence for line end).
-
- -----------------
- -- Subprograms --
- -----------------
-
- procedure Set_Special_Output (P : Output_Proc);
- -- Sets subsequent output to call procedure P. If P is null, then
- -- the call cancels the effect of a previous call, reverting the
- -- output to standard error or standard output depending on the
- -- mode at the time of previous call. Any exception generated by
- -- by calls to P is simply propagated to the caller of the routine
- -- causing the write operation.
-
- procedure Cancel_Special_Output;
- -- Cancels the effect of a call to Set_Special_Output, if any.
- -- The output is then directed to standard error or standard output
- -- depending on the last call to Set_Standard_Error or Set_Standard_Output.
- -- It is never an error to call Cancel_Special_Output. It has the same
- -- effect as calling Set_Special_Output (null).
-
- procedure Set_Standard_Error;
- -- Sets subsequent output to appear on the standard error file (whatever
- -- that might mean for the host operating system, if anything) when
- -- no special output is in effect. When a special output is in effect,
- -- the output will appear on standard error only after special output
- -- has been cancelled.
-
- procedure Set_Standard_Output;
- -- Sets subsequent output to appear on the standard output file (whatever
- -- that might mean for the host operating system, if anything) when
- -- no special output is in effect. When a special output is in effect,
- -- the output will appear on standard output only after special output
- -- has been cancelled. Output to standard output is the default mode
- -- before any call to either of the Set procedures.
-
- procedure Write_Char (C : Character);
- -- Write one character to the standard output file. Note that the
- -- character should not be LF or CR (use Write_Eol for end of line)
-
- procedure Write_Erase_Char (C : Character);
- -- If last character in buffer matches C, erase it, otherwise no effect
-
- procedure Write_Eol;
- -- Write an end of line (whatever is required by the system in use,
- -- e.g. CR/LF for DOS, or LF for Unix) to the standard output file.
- -- This routine also empties the line buffer, actually writing it
- -- to the file. Note that Write_Eol is the only routine that causes
- -- any actual output to be written. Trailing spaces are removed.
-
- procedure Write_Eol_Keep_Blanks;
- -- Similar as Write_Eol, except that trailing spaces are not removed
-
- procedure Write_Int (Val : Int);
- -- Write an integer value with no leading blanks or zeroes. Negative
- -- values are preceded by a minus sign).
-
- procedure Write_Spaces (N : Nat);
- -- Write N spaces
-
- procedure Write_Str (S : String);
- -- Write a string of characters to the standard output file. Note that
- -- end of line is normally handled separately using WRITE_EOL, but it
- -- is allowed for the string to contain LF (but not CR) characters,
- -- which are properly interpreted as end of line characters. The string
- -- may also contain horizontal tab characters.
-
- procedure Write_Line (S : String);
- -- Equivalent to Write_Str (S) followed by Write_Eol;
-
- function Column return Pos;
- pragma Inline (Column);
- -- Returns the number of the column about to be written (e.g. a value
- -- of 1 means the current line is empty).
-
- -------------------------
- -- Buffer Save/Restore --
- -------------------------
-
- -- This facility allows the current line buffer to be saved and restored
-
- type Saved_Output_Buffer is private;
- -- Type used for Save/Restore_Buffer
-
- Buffer_Max : constant := Hostparm.Max_Line_Length;
- -- Maximal size of a buffered output line
-
- function Save_Output_Buffer return Saved_Output_Buffer;
- -- Save current line buffer and reset line buffer to empty
-
- procedure Restore_Output_Buffer (S : Saved_Output_Buffer);
- -- Restore previously saved output buffer. The value in S is not affected
- -- so it is legitimate to restore a buffer more than once.
-
- --------------------------
- -- Debugging Procedures --
- --------------------------
-
- -- The following procedures are intended only for debugging purposes,
- -- for temporary insertion into the text in environments where a debugger
- -- is not available. They all have non-standard very short lower case
- -- names, precisely to make sure that they are only used for debugging!
-
- procedure w (C : Character);
- -- Dump quote, character, quote, followed by line return
-
- procedure w (S : String);
- -- Dump string followed by line return
-
- procedure w (V : Int);
- -- Dump integer followed by line return
-
- procedure w (B : Boolean);
- -- Dump Boolean followed by line return
-
- procedure w (L : String; C : Character);
- -- Dump contents of string followed by blank, quote, character, quote
-
- procedure w (L : String; S : String);
- -- Dump two strings separated by blanks, followed by line return
-
- procedure w (L : String; V : Int);
- -- Dump contents of string followed by blank, integer, line return
-
- procedure w (L : String; B : Boolean);
- -- Dump contents of string followed by blank, Boolean, line return
-
-private
- -- Note: the following buffer and column position are maintained by the
- -- subprograms defined in this package, and cannot be directly modified or
- -- accessed by a client.
-
- Buffer : String (1 .. Buffer_Max + 1);
- for Buffer'Alignment use 4;
- -- Buffer used to build output line. We do line buffering because it
- -- is needed for the support of the debug-generated-code option (-gnatD).
- -- Historically it was first added because on VMS, line buffering is
- -- needed with certain file formats. So in any case line buffering must
- -- be retained for this purpose, even if other reasons disappear. Note
- -- any attempt to write more output to a line than can fit in the buffer
- -- will be silently ignored. The alignment clause improves the efficiency
- -- of the save/restore procedures.
-
- Next_Col : Positive range 1 .. Buffer'Length + 1 := 1;
- -- Column about to be written
-
- type Saved_Output_Buffer is record
- Buffer : String (1 .. Buffer_Max + 1);
- Next_Col : Positive;
- end record;
-
-end Output;