214 lines
9.5 KiB
Ada
214 lines
9.5 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- O U T P U T --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2015, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package contains low level output routines used by the compiler for
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-- writing error messages and informational output. It is also used by the
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-- debug source file output routines (see Sprint.Print_Debug_Line).
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with Hostparm; use Hostparm;
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with Types; use Types;
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pragma Warnings (Off);
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-- This package is used also by gnatcoll
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with System.OS_Lib; use System.OS_Lib;
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pragma Warnings (On);
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package Output is
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pragma Elaborate_Body;
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type Output_Proc is access procedure (S : String);
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-- This type is used for the Set_Special_Output procedure. If Output_Proc
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-- is called, then instead of lines being written to standard error or
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-- standard output, a call is made to the given procedure for each line,
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-- passing the line with an end of line character (which is a single
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-- ASCII.LF character, even in systems which normally use CR/LF or some
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-- other sequence for line end).
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-----------------
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-- Subprograms --
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-----------------
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procedure Set_Special_Output (P : Output_Proc);
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-- Sets subsequent output to call procedure P. If P is null, then the call
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-- cancels the effect of a previous call, reverting the output to standard
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-- error or standard output depending on the mode at the time of previous
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-- call. Any exception generated by calls to P is simply propagated to
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-- the caller of the routine causing the write operation.
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procedure Cancel_Special_Output;
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-- Cancels the effect of a call to Set_Special_Output, if any. The output
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-- is then directed to standard error or standard output depending on the
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-- last call to Set_Standard_Error or Set_Standard_Output. It is never an
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-- error to call Cancel_Special_Output. It has the same effect as calling
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-- Set_Special_Output (null).
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procedure Ignore_Output (S : String);
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-- Does nothing. To disable output, pass Ignore_Output'Access to
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-- Set_Special_Output.
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procedure Set_Standard_Error;
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-- Sets subsequent output to appear on the standard error file (whatever
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-- that might mean for the host operating system, if anything) when
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-- no special output is in effect. When a special output is in effect,
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-- the output will appear on standard error only after special output
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-- has been cancelled.
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procedure Set_Standard_Output;
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-- Sets subsequent output to appear on the standard output file (whatever
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-- that might mean for the host operating system, if anything) when no
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-- special output is in effect. When a special output is in effect, the
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-- output will appear on standard output only after special output has been
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-- cancelled. Output to standard output is the default mode before any call
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-- to either of the Set procedures.
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procedure Set_Output (FD : File_Descriptor);
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-- Sets subsequent output to appear on the given file descriptor when no
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-- special output is in effect. When a special output is in effect, the
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-- output will appear on the given file descriptor only after special
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-- output has been cancelled.
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procedure Indent;
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-- Increases the current indentation level. Whenever a line is written
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-- (triggered by Eol), an appropriate amount of whitespace is added to the
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-- beginning of the line, wrapping around if it gets too long.
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procedure Outdent;
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-- Decreases the current indentation level
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procedure Write_Char (C : Character);
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-- Write one character to the standard output file. If the character is LF,
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-- this is equivalent to Write_Eol.
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procedure Write_Erase_Char (C : Character);
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-- If last character in buffer matches C, erase it, otherwise no effect
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procedure Write_Eol;
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-- Write an end of line (whatever is required by the system in use, e.g.
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-- CR/LF for DOS, or LF for Unix) to the standard output file. This routine
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-- also empties the line buffer, actually writing it to the file. Note that
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-- Write_Eol is the only routine that causes any actual output to be
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-- written. Trailing spaces are removed.
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procedure Write_Eol_Keep_Blanks;
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-- Similar as Write_Eol, except that trailing spaces are not removed
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procedure Write_Int (Val : Int);
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-- Write an integer value with no leading blanks or zeroes. Negative values
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-- are preceded by a minus sign).
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procedure Write_Spaces (N : Nat);
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-- Write N spaces
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procedure Write_Str (S : String);
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-- Write a string of characters to the standard output file. Note that
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-- end of line is normally handled separately using WRITE_EOL, but it is
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-- allowable for the string to contain LF (but not CR) characters, which
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-- are properly interpreted as end of line characters. The string may also
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-- contain horizontal tab characters.
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procedure Write_Line (S : String);
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-- Equivalent to Write_Str (S) followed by Write_Eol;
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function Last_Char return Character;
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-- Returns last character written on the current line, or null if the
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-- current line is (so far) empty.
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procedure Delete_Last_Char;
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-- Deletes last character written on the current line, no effect if the
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-- current line is (so far) empty.
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function Column return Pos;
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pragma Inline (Column);
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-- Returns the number of the column about to be written (e.g. a value of 1
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-- means the current line is empty).
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-------------------------
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-- Buffer Save/Restore --
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-------------------------
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-- This facility allows the current line buffer to be saved and restored
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type Saved_Output_Buffer is private;
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-- Type used for Save/Restore_Buffer
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Buffer_Max : constant := Hostparm.Max_Line_Length;
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-- Maximal size of a buffered output line
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function Save_Output_Buffer return Saved_Output_Buffer;
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-- Save current line buffer and reset line buffer to empty
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procedure Restore_Output_Buffer (S : Saved_Output_Buffer);
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-- Restore previously saved output buffer. The value in S is not affected
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-- so it is legitimate to restore a buffer more than once.
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--------------------------
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-- Debugging Procedures --
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--------------------------
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-- The following procedures are intended only for debugging purposes,
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-- for temporary insertion into the text in environments where a debugger
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-- is not available. They all have non-standard very short lower case
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-- names, precisely to make sure that they are only used for debugging.
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procedure w (C : Character);
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-- Dump quote, character, quote, followed by line return
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procedure w (S : String);
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-- Dump string followed by line return
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procedure w (V : Int);
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-- Dump integer followed by line return
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procedure w (B : Boolean);
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-- Dump Boolean followed by line return
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procedure w (L : String; C : Character);
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-- Dump contents of string followed by blank, quote, character, quote
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procedure w (L : String; S : String);
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-- Dump two strings separated by blanks, followed by line return
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procedure w (L : String; V : Int);
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-- Dump contents of string followed by blank, integer, line return
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procedure w (L : String; B : Boolean);
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-- Dump contents of string followed by blank, Boolean, line return
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private
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type Saved_Output_Buffer is record
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Buffer : String (1 .. Buffer_Max + 1);
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Next_Col : Positive;
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Cur_Indentation : Natural;
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end record;
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end Output;
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