e0f63680d9
2014-02-19 Robert Dewar <dewar@adacore.com> * exp_attr.adb (Expand_Min_Max_Attribute): New procedure (Expand_N_Attribute_Reference): Use this procedure for Min and Max. * exp_ch4.adb (Expand_N_Expression_With_Actions): Remove object declarations from list of actions. * output.ads, output.adb (Delete_Last_Char): New procedure. * sinfo.ads: Document handling of Mod and expression with actions in Modify_Tree_For_C mode. 2014-02-19 Ed Schonberg <schonberg@adacore.com> * par-ch9.adb (P_Task): Add a null statement to produce a well-formed task body when due to a previous syntax error the statement list is empty. 2014-02-19 Hristian Kirtchev <kirtchev@adacore.com> * sem_prag.adb (Check_Dependency_Clause): Account for the case where a state with a non-null refinement matches a null output list. Comment reformatting. (Inputs_Match): Copy a solitary input to avoid an assertion failure when trying to match the same input in multiple clauses. 2014-02-19 Gary Dismukes <dismukes@adacore.com> * sem_attr.adb: Minor typo fix. From-SVN: r207880
455 lines
12 KiB
Ada
455 lines
12 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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-- B o d y --
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-- --
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-- Copyright (C) 1992-2013, 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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package body Output is
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Current_FD : File_Descriptor := Standout;
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-- File descriptor for current output
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Special_Output_Proc : Output_Proc := null;
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-- Record argument to last call to Set_Special_Output. If this is
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-- non-null, then we are in special output mode.
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Indentation_Amount : constant Positive := 3;
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-- Number of spaces to output for each indentation level
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Indentation_Limit : constant Positive := 40;
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-- Indentation beyond this number of spaces wraps around
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pragma Assert (Indentation_Limit < Buffer_Max / 2);
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-- Make sure this is substantially shorter than the line length
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Cur_Indentation : Natural := 0;
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-- Number of spaces to indent each line
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-----------------------
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-- Local_Subprograms --
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-----------------------
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procedure Flush_Buffer;
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-- Flush buffer if non-empty and reset column counter
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---------------------------
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-- Cancel_Special_Output --
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---------------------------
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procedure Cancel_Special_Output is
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begin
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Special_Output_Proc := null;
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end Cancel_Special_Output;
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------------
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-- Column --
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------------
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function Column return Pos is
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begin
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return Pos (Next_Col);
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end Column;
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----------------------
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-- Delete_Last_Char --
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----------------------
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procedure Delete_Last_Char is
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begin
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if Next_Col /= 1 then
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Next_Col := Next_Col - 1;
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end if;
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end Delete_Last_Char;
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------------------
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-- Flush_Buffer --
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------------------
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procedure Flush_Buffer is
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Write_Error : exception;
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-- Raised if Write fails
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------------------
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-- Write_Buffer --
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------------------
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procedure Write_Buffer (Buf : String);
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-- Write out Buf, either using Special_Output_Proc, or the normal way
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-- using Write. Raise Write_Error if Write fails (presumably due to disk
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-- full). Write_Error is not used in the case of Special_Output_Proc.
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procedure Write_Buffer (Buf : String) is
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begin
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-- If Special_Output_Proc has been set, then use it
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if Special_Output_Proc /= null then
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Special_Output_Proc.all (Buf);
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-- If output is not set, then output to either standard output
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-- or standard error.
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elsif Write (Current_FD, Buf'Address, Buf'Length) /= Buf'Length then
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raise Write_Error;
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end if;
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end Write_Buffer;
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Len : constant Natural := Next_Col - 1;
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-- Start of processing for Flush_Buffer
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begin
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if Len /= 0 then
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begin
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-- If there's no indentation, or if the line is too long with
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-- indentation, or if it's a blank line, just write the buffer.
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if Cur_Indentation = 0
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or else Cur_Indentation + Len > Buffer_Max
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or else Buffer (1 .. Len) = (1 => ASCII.LF)
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then
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Write_Buffer (Buffer (1 .. Len));
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-- Otherwise, construct a new buffer with preceding spaces, and
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-- write that.
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else
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declare
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Indented_Buffer : constant String :=
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(1 .. Cur_Indentation => ' ') &
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Buffer (1 .. Len);
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begin
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Write_Buffer (Indented_Buffer);
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end;
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end if;
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exception
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when Write_Error =>
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-- If there are errors with standard error just quit. Otherwise
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-- set the output to standard error before reporting a failure
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-- and quitting.
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if Current_FD /= Standerr then
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Current_FD := Standerr;
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Next_Col := 1;
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Write_Line ("fatal error: disk full");
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end if;
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OS_Exit (2);
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end;
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-- Buffer is now empty
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Next_Col := 1;
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end if;
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end Flush_Buffer;
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-------------------
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-- Ignore_Output --
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-------------------
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procedure Ignore_Output (S : String) is
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begin
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null;
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end Ignore_Output;
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------------
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-- Indent --
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------------
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procedure Indent is
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begin
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-- The "mod" in the following assignment is to cause a wrap around in
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-- the case where there is too much indentation.
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Cur_Indentation :=
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(Cur_Indentation + Indentation_Amount) mod Indentation_Limit;
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end Indent;
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---------------
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-- Last_Char --
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---------------
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function Last_Char return Character is
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begin
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if Next_Col /= 1 then
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return Buffer (Next_Col - 1);
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else
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return ASCII.NUL;
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end if;
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end Last_Char;
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-------------
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-- Outdent --
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-------------
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procedure Outdent is
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begin
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-- The "mod" here undoes the wrap around from Indent above
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Cur_Indentation :=
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(Cur_Indentation - Indentation_Amount) mod Indentation_Limit;
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end Outdent;
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---------------------------
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-- Restore_Output_Buffer --
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---------------------------
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procedure Restore_Output_Buffer (S : Saved_Output_Buffer) is
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begin
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Next_Col := S.Next_Col;
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Cur_Indentation := S.Cur_Indentation;
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Buffer (1 .. Next_Col - 1) := S.Buffer (1 .. Next_Col - 1);
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end Restore_Output_Buffer;
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------------------------
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-- Save_Output_Buffer --
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------------------------
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function Save_Output_Buffer return Saved_Output_Buffer is
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S : Saved_Output_Buffer;
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begin
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S.Buffer (1 .. Next_Col - 1) := Buffer (1 .. Next_Col - 1);
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S.Next_Col := Next_Col;
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S.Cur_Indentation := Cur_Indentation;
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Next_Col := 1;
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Cur_Indentation := 0;
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return S;
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end Save_Output_Buffer;
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------------------------
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-- Set_Special_Output --
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------------------------
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procedure Set_Special_Output (P : Output_Proc) is
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begin
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Special_Output_Proc := P;
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end Set_Special_Output;
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----------------
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-- Set_Output --
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----------------
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procedure Set_Output (FD : File_Descriptor) is
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begin
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if Special_Output_Proc = null then
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Flush_Buffer;
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end if;
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Current_FD := FD;
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end Set_Output;
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------------------------
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-- Set_Standard_Error --
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------------------------
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procedure Set_Standard_Error is
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begin
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Set_Output (Standerr);
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end Set_Standard_Error;
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-------------------------
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-- Set_Standard_Output --
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-------------------------
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procedure Set_Standard_Output is
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begin
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Set_Output (Standout);
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end Set_Standard_Output;
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-------
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-- w --
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-------
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procedure w (C : Character) is
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begin
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Write_Char (''');
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Write_Char (C);
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Write_Char (''');
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Write_Eol;
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end w;
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procedure w (S : String) is
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begin
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Write_Str (S);
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Write_Eol;
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end w;
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procedure w (V : Int) is
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begin
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Write_Int (V);
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Write_Eol;
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end w;
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procedure w (B : Boolean) is
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begin
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if B then
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w ("True");
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else
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w ("False");
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end if;
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end w;
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procedure w (L : String; C : Character) is
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begin
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Write_Str (L);
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Write_Char (' ');
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w (C);
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end w;
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procedure w (L : String; S : String) is
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begin
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Write_Str (L);
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Write_Char (' ');
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w (S);
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end w;
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procedure w (L : String; V : Int) is
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begin
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Write_Str (L);
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Write_Char (' ');
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w (V);
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end w;
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procedure w (L : String; B : Boolean) is
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begin
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Write_Str (L);
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Write_Char (' ');
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w (B);
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end w;
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----------------
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-- Write_Char --
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----------------
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procedure Write_Char (C : Character) is
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begin
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if Next_Col = Buffer'Length then
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Write_Eol;
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end if;
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if C = ASCII.LF then
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Write_Eol;
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else
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Buffer (Next_Col) := C;
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Next_Col := Next_Col + 1;
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end if;
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end Write_Char;
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---------------
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-- Write_Eol --
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---------------
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procedure Write_Eol is
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begin
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-- Remove any trailing spaces
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while Next_Col > 1 and then Buffer (Next_Col - 1) = ' ' loop
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Next_Col := Next_Col - 1;
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end loop;
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Buffer (Next_Col) := ASCII.LF;
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Next_Col := Next_Col + 1;
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Flush_Buffer;
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end Write_Eol;
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---------------------------
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-- Write_Eol_Keep_Blanks --
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---------------------------
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procedure Write_Eol_Keep_Blanks is
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begin
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Buffer (Next_Col) := ASCII.LF;
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Next_Col := Next_Col + 1;
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Flush_Buffer;
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end Write_Eol_Keep_Blanks;
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----------------------
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-- Write_Erase_Char --
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----------------------
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procedure Write_Erase_Char (C : Character) is
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begin
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if Next_Col /= 1 and then Buffer (Next_Col - 1) = C then
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Next_Col := Next_Col - 1;
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end if;
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end Write_Erase_Char;
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---------------
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-- Write_Int --
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---------------
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procedure Write_Int (Val : Int) is
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begin
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if Val < 0 then
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Write_Char ('-');
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Write_Int (-Val);
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else
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if Val > 9 then
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Write_Int (Val / 10);
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end if;
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Write_Char (Character'Val ((Val mod 10) + Character'Pos ('0')));
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end if;
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end Write_Int;
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----------------
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-- Write_Line --
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----------------
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procedure Write_Line (S : String) is
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begin
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Write_Str (S);
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Write_Eol;
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end Write_Line;
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------------------
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-- Write_Spaces --
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------------------
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procedure Write_Spaces (N : Nat) is
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begin
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for J in 1 .. N loop
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Write_Char (' ');
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end loop;
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end Write_Spaces;
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---------------
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-- Write_Str --
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---------------
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procedure Write_Str (S : String) is
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begin
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for J in S'Range loop
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Write_Char (S (J));
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end loop;
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end Write_Str;
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end Output;
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