284 lines
8.5 KiB
Ada
284 lines
8.5 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . T E X T _ I O . E N U M E R A T I O N _ A U X --
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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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with Ada.Text_IO.Generic_Aux; use Ada.Text_IO.Generic_Aux;
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with Ada.Characters.Handling; use Ada.Characters.Handling;
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-- Note: this package does not yet deal properly with wide characters ???
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package body Ada.Text_IO.Enumeration_Aux is
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------------------
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-- Get_Enum_Lit --
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------------------
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procedure Get_Enum_Lit
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(File : File_Type;
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Buf : out String;
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Buflen : out Natural)
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is
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ch : Integer;
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C : Character;
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begin
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Buflen := 0;
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Load_Skip (File);
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ch := Getc (File);
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C := Character'Val (ch);
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-- Character literal case. If the initial character is a quote, then
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-- we read as far as we can without backup (see ACVC test CE3905L)
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if C = ''' then
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Store_Char (File, ch, Buf, Buflen);
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ch := Getc (File);
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if ch in 16#20# .. 16#7E# or else ch >= 16#80# then
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Store_Char (File, ch, Buf, Buflen);
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ch := Getc (File);
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if ch = Character'Pos (''') then
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Store_Char (File, ch, Buf, Buflen);
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else
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Ungetc (ch, File);
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end if;
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else
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Ungetc (ch, File);
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end if;
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-- Similarly for identifiers, read as far as we can, in particular,
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-- do read a trailing underscore (again see ACVC test CE3905L to
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-- understand why we do this, although it seems somewhat peculiar).
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else
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-- Identifier must start with a letter
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if not Is_Letter (C) then
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Ungetc (ch, File);
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return;
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end if;
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-- If we do have a letter, loop through the characters quitting on
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-- the first non-identifier character (note that this includes the
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-- cases of hitting a line mark or page mark).
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loop
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C := Character'Val (ch);
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Store_Char (File, Character'Pos (To_Upper (C)), Buf, Buflen);
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ch := Getc (File);
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exit when ch = EOF_Char;
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C := Character'Val (ch);
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exit when not Is_Letter (C)
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and then not Is_Digit (C)
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and then C /= '_';
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exit when C = '_'
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and then Buf (Buflen) = '_';
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end loop;
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Ungetc (ch, File);
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end if;
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end Get_Enum_Lit;
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---------
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-- Put --
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---------
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procedure Put
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(File : File_Type;
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Item : String;
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Width : Field;
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Set : Type_Set)
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is
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Actual_Width : constant Count := Count'Max (Count (Width), Item'Length);
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begin
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-- Deal with limited line length of output file
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if Line_Length (File) /= 0 then
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-- If actual width exceeds line length, raise Layout_Error
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if Actual_Width > Line_Length (File) then
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raise Layout_Error;
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end if;
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-- If full width cannot fit on current line move to new line
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if Actual_Width + (Col (File) - 1) > Line_Length (File) then
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New_Line (File);
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end if;
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end if;
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-- Output in lower case if necessary
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if Set = Lower_Case and then Item (Item'First) /= ''' then
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declare
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Iteml : String (Item'First .. Item'Last);
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begin
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for J in Item'Range loop
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Iteml (J) := To_Lower (Item (J));
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end loop;
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Put_Item (File, Iteml);
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end;
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-- Otherwise output in upper case
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else
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Put_Item (File, Item);
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end if;
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-- Fill out item with spaces to width
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for J in 1 .. Actual_Width - Item'Length loop
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Put (File, ' ');
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end loop;
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end Put;
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----------
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-- Puts --
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----------
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procedure Puts
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(To : out String;
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Item : String;
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Set : Type_Set)
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is
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Ptr : Natural;
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begin
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if Item'Length > To'Length then
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raise Layout_Error;
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else
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Ptr := To'First;
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for J in Item'Range loop
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if Set = Lower_Case and then Item (Item'First) /= ''' then
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To (Ptr) := To_Lower (Item (J));
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else
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To (Ptr) := Item (J);
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end if;
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Ptr := Ptr + 1;
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end loop;
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while Ptr <= To'Last loop
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To (Ptr) := ' ';
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Ptr := Ptr + 1;
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end loop;
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end if;
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end Puts;
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-------------------
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-- Scan_Enum_Lit --
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-------------------
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procedure Scan_Enum_Lit
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(From : String;
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Start : out Natural;
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Stop : out Natural)
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is
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C : Character;
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-- Processing for Scan_Enum_Lit
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begin
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String_Skip (From, Start);
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-- Character literal case. If the initial character is a quote, then
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-- we read as far as we can without backup (see ACVC test CE3905L
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-- which is for the analogous case for reading from a file).
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if From (Start) = ''' then
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Stop := Start;
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if Stop = From'Last then
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raise Data_Error;
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else
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Stop := Stop + 1;
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end if;
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if From (Stop) in ' ' .. '~'
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or else From (Stop) >= Character'Val (16#80#)
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then
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if Stop = From'Last then
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raise Data_Error;
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else
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Stop := Stop + 1;
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if From (Stop) = ''' then
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return;
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end if;
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end if;
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end if;
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raise Data_Error;
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-- Similarly for identifiers, read as far as we can, in particular,
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-- do read a trailing underscore (again see ACVC test CE3905L to
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-- understand why we do this, although it seems somewhat peculiar).
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else
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-- Identifier must start with a letter
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if not Is_Letter (From (Start)) then
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raise Data_Error;
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end if;
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-- If we do have a letter, loop through the characters quitting on
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-- the first non-identifier character (note that this includes the
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-- cases of hitting a line mark or page mark).
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Stop := Start;
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while Stop < From'Last loop
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C := From (Stop + 1);
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exit when not Is_Letter (C)
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and then not Is_Digit (C)
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and then C /= '_';
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exit when C = '_'
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and then From (Stop) = '_';
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Stop := Stop + 1;
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end loop;
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end if;
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end Scan_Enum_Lit;
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end Ada.Text_IO.Enumeration_Aux;
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