Make-lang.in, [...]: Find runtime source in libgnat/

2017-09-08  Nicolas Roche  <roche@adacore.com>

	* gcc-interface/Make-lang.in, gcc-interface/Makefile.in: Find runtime
	source in libgnat/
	* a-lfztio.ads, g-timsta.ads, g-sercom-linux.adb, s-osprim-solaris.adb,
	a-inteio.ads, s-stchop-rtems.adb, s-casuti.adb, s-pack39.adb,
	i-vxwork-x86.ads, a-strbou.adb, a-stzmap.adb, s-assert.adb,
	a-sfecin.ads, a-cohama.adb, s-casuti.ads, a-suenco.adb, s-pack39.ads,
	a-stzmap.ads, a-strbou.ads, s-stalib.adb, s-trasym.adb, g-comver.adb,
	s-assert.ads, s-vector.ads, g-cgi.adb, a-cohama.ads, s-wchcnv.adb,
	a-titest.adb, s-pack48.adb, a-suenco.ads, a-strunb.adb, s-stalib.ads,
	s-trasym.ads, a-nudira.adb, g-comver.ads, a-nuflra.adb, g-cgi.ads,
	a-chacon.adb, s-wchcnv.ads, a-excach.adb, s-pack48.ads, a-titest.ads,
	a-strunb.ads, s-dwalin.adb, a-nudira.ads, a-chtgbo.adb, s-resfil.adb,
	a-scteio.ads, a-nuflra.ads, g-soliop-mingw.ads, s-pack57.adb,
	a-chacon.ads, s-bytswa.ads, s-pooloc.adb, g-os_lib.adb, s-dwalin.ads,
	a-szuzha.adb, s-resfil.ads, a-chtgbo.ads, s-spsufi.adb, s-pack57.ads,
	s-pooloc.ads, g-os_lib.ads, a-stfiha.ads, a-lcteio.ads, a-wtcoau.adb,
	a-szuzha.ads, s-mmosin-unix.adb, a-stmaco.ads, s-spsufi.ads,
	s-stchop-limit.ads, a-wtcoau.ads, a-exctra.adb, s-mmosin-unix.ads,
	s-sequio.adb, s-conca2.adb, g-table.adb, s-imglli.adb,
	a-numaux-x86.adb, a-strsea.adb, s-wchstw.adb, a-clrefi.adb,
	a-wwboio.adb, a-exctra.ads, s-sequio.ads, s-conca2.ads, a-wwunio.ads,
	system-linux-hppa.ads, g-table.ads, s-dimkio.ads, s-imglli.ads,
	a-cofove.adb, a-numaux-x86.ads, s-wchstw.ads, a-strsea.ads,
	a-clrefi.ads, a-wwboio.ads, s-stratt-xdr.adb, s-crc32.adb,
	s-excmac-arm.adb, g-busora.adb, a-cofove.ads, s-osprim-unix.adb,
	g-io.adb, s-pack49.adb, s-crc32.ads, s-excmac-arm.ads, a-fzteio.ads,
	g-busora.ads, s-stausa.adb, system-linux-mips.ads, sequenio.ads,
	g-exctra.adb, g-rewdat.adb, a-cgaaso.adb, g-io.ads, s-pack49.ads,
	a-wtflau.adb, a-undesu.adb, s-stausa.ads, a-ztenau.adb, g-enutst.ads,
	calendar.ads, s-pack58.adb, g-rewdat.ads, g-exctra.ads, s-ststop.adb,
	a-cgaaso.ads, a-strfix.adb, a-comlin.adb, a-strunb-shared.adb,
	a-wtflau.ads, a-undesu.ads, a-cbhase.adb, a-ztenau.ads, s-os_lib.adb,
	a-coorse.adb, a-chlat1.ads, s-pack58.ads, s-ststop.ads, a-strfix.ads,
	a-comlin.ads, a-strunb-shared.ads, a-nscefu.ads, s-valboo.adb,
	directio.ads, a-chtgke.adb, a-cbhase.ads, a-wtinau.adb,
	system-linux-alpha.ads, s-os_lib.ads, a-coorse.ads,
	system-linux-s390.ads, s-imgwiu.adb, a-chtgop.adb, s-valboo.ads,
	a-chtgke.ads, a-tienio.adb, s-conca3.adb, a-wtinau.ads,
	system-darwin-ppc.ads, i-c.adb, s-expllu.adb, g-expect.adb,
	g-sha256.ads, s-vallld.adb, s-imgwiu.ads, a-chtgop.ads, a-strmap.adb,
	a-tienio.ads, s-conca3.ads, s-imgint.adb, i-c.ads, s-expllu.ads,
	s-osprim-darwin.adb, a-cogeso.adb, g-expect.ads, a-iwteio.ads,
	s-vallld.ads, a-coinho-shared.adb, g-shsh64.adb, a-strmap.ads,
	g-comlin.adb, a-excpol.adb, s-imgint.ads, a-ztdeau.adb, a-cogeso.ads,
	a-coinho-shared.ads, g-shsh64.ads, g-comlin.ads, a-stzsup.adb,
	a-rbtgbk.adb, a-wtmoau.adb, a-ztdeau.ads, s-exnlli.adb, g-tty.adb,
	g-heasor.adb, g-socthi-dummy.adb, s-llflex.ads, a-zchara.ads,
	a-stzsup.ads, a-ztcstr.adb, a-rbtgbk.ads, a-sfwtio.ads, a-wtmoau.ads,
	a-sulcin.adb, s-exnlli.ads, system-freebsd.ads, a-stunha.adb,
	a-charac.ads, g-tty.ads, g-heasor.ads, s-exctra.adb,
	g-socthi-dummy.ads, a-coboho.adb, a-ztcstr.ads, a-tideio.adb,
	a-sulcin.ads, a-wrstfi.adb, g-alleve.adb, s-pack59.adb, a-ngrear.adb,
	a-stboha.adb, a-stunau-shared.adb, a-stunha.ads, a-lfwtio.ads,
	s-fileio.adb, s-exctra.ads, a-coboho.ads, a-ioexce.ads, a-tideio.ads,
	a-ngrear.ads, a-wrstfi.ads, s-pack59.ads, g-alleve.ads, a-stboha.ads,
	s-poosiz.adb, g-traceb.adb, g-rannum.adb, machcode.ads, s-purexc.ads,
	s-fileio.ads, a-cfinve.adb, a-crbtgk.adb, system-solaris-x86.ads,
	s-poosiz.ads, g-rannum.ads, g-traceb.ads, a-except.adb, s-conca4.adb,
	a-stream.adb, a-cfinve.ads, a-crbtgk.ads, s-wchwts.adb,
	system-mingw.ads, a-except.ads, s-conca4.ads, a-chzla9.ads,
	s-valenu.adb, s-soflin.adb, a-stream.ads, a-cgarso.adb, s-valllu.adb,
	g-crc32.adb, s-wchwts.ads, s-fatflt.ads, s-imguns.adb, s-strcom.adb,
	g-decstr.adb, s-valenu.ads, s-soflin.ads, a-cgarso.ads, a-cwila1.ads,
	s-valllu.ads, g-crc32.ads, s-imguns.ads, g-spipat.adb, s-valwch.adb,
	s-strcom.ads, g-decstr.ads, text_io.ads, g-debuti.adb, s-stchop.adb,
	g-spipat.ads, s-valwch.ads, a-string.ads, s-exnint.adb, g-awk.adb,
	g-tasloc.adb, s-wwdenu.adb, s-boustr.adb, a-zchuni.adb, s-stchop.ads,
	g-debuti.ads, s-stopoo.adb, system-dragonfly-x86_64.ads,
	system-linux-x86.ads, s-exnint.ads, g-awk.ads, a-stzhas.adb,
	g-tasloc.ads, s-wwdenu.ads, g-debpoo.adb, g-except.ads,
	g-sse.ads, s-boustr.ads, a-zchuni.ads, s-bitops.adb, s-wwdwch.adb,
	s-stopoo.ads, a-catizo.adb, a-stzhas.ads, a-nlcefu.ads, g-debpoo.ads,
	i-vxwoio.adb, s-bitops.ads, g-io-put-vxworks.adb, s-wwdwch.ads,
	g-sehamd.adb, a-ssicst.adb, a-catizo.ads, s-mmap.adb, g-string.adb,
	s-traceb.adb, a-swunau.adb, s-rannum.adb, a-ticoau.adb, i-vxwoio.ads,
	g-sehamd.ads, a-stwiun.adb, a-ssicst.ads, s-conca5.adb, a-ssitio.ads,
	s-mmap.ads, a-zttest.adb, g-string.ads, g-sercom.adb, a-cdlili.adb,
	a-swunau.ads, s-traceb.ads, s-rannum.ads, a-ticoau.ads, system-aix.ads,
	a-cforma.adb, a-stwiun.ads, s-conca5.ads, s-carsi8.adb, a-zttest.ads,
	g-sercom.ads, a-cdlili.ads, a-cihama.adb, g-sptain.ads, a-cforma.ads,
	s-maccod.ads, s-carsi8.ads, a-strsup.adb, g-sha1.adb, a-cihama.ads,
	g-stseme.adb, s-traent.adb, s-valcha.adb, g-curexc.ads, a-strsup.ads,
	g-sha1.ads, a-sflcin.ads, s-traent.ads, s-pack10.adb, s-valcha.ads,
	a-coteio.ads, s-tasloc.adb, g-utf_32.adb, a-suteio.adb, s-except.adb,
	a-direct.adb, g-stsifd-sockets.adb, a-numaux-vxworks.ads, s-winext.ads,
	s-pack10.ads, a-ztexio.adb, a-tiflau.adb, system-vxworks-arm.ads,
	s-tasloc.ads, a-suteio.ads, g-utf_32.ads, s-except.ads,
	a-direct.ads, a-swbwha.adb, g-hesorg.adb, s-wwdcha.adb, a-wtedit.adb,
	a-ztexio.ads, a-wtcoio.adb, a-tiflau.ads, a-ssizti.ads, s-casi32.adb,
	a-swbwha.ads, s-veboop.adb, g-hesorg.ads, s-parame-rtems.adb,
	s-wwdcha.ads, a-wtedit.ads, a-stuten.adb, a-coinve.adb, a-wtcoio.ads,
	s-casi32.ads, s-string.adb, a-tiinau.adb, a-cusyqu.adb, s-conca6.adb,
	s-veboop.ads, a-cgcaso.adb, a-numaux-darwin.adb, a-envvar.adb,
	a-stuten.ads, s-secsta.adb, a-coinve.ads, s-string.ads, a-cusyqu.ads,
	a-tiinau.ads, s-osprim-vxworks.adb, s-conca6.ads, g-spchge.adb,
	s-parint.adb, a-cuprqu.adb, a-cgcaso.ads, a-numaux-darwin.ads,
	a-envvar.ads, s-secsta.ads, g-spchge.ads, s-parint.ads, a-cuprqu.ads,
	a-swuwti.adb, a-flteio.ads, a-sbhcin.adb, a-coprnu.adb, g-u3spch.adb,
	s-atocou.adb, g-ctrl_c.adb, a-swuwti.ads, a-calend.adb, a-sbhcin.ads,
	a-coprnu.ads, g-dirope.adb, g-sha512.ads, g-u3spch.ads, s-atocou.ads,
	g-ctrl_c.ads, a-timoau.adb, a-witeio.adb, s-pack11.adb, a-strhas.adb,
	a-wtflio.adb, g-spitbo.adb, a-calend.ads, a-ztenio.adb, g-dirope.ads,
	a-slcain.adb, g-sechas.adb, a-timoau.ads, a-witeio.ads, s-pack11.ads,
	s-shasto.adb, s-traceb-mastop.adb, a-ciorse.adb, s-utf_32.adb,
	a-strhas.ads, a-wtflio.ads, g-spitbo.ads, a-ztenio.ads, a-slcain.ads,
	g-sechas.ads, s-gearop.adb, a-siztio.ads, s-pack20.adb, s-shasto.ads,
	a-ciorse.ads, s-utf_32.ads, s-crtl.ads, a-wtinio.adb, s-elaall.adb,
	s-explli.adb, s-chepoo.ads, s-gearop.ads, a-einuoc.adb, s-pack20.ads,
	system-linux-ia64.ads, a-swunau-shared.adb, a-wtinio.ads, g-alvety.ads,
	a-liztio.ads, g-calend.adb, s-conca7.adb, s-elaall.ads, s-explli.ads,
	a-einuoc.ads, s-widboo.adb, s-imgdec.adb, a-cbhama.adb, g-calend.ads,
	s-conca7.ads, a-llitio.ads, i-cexten.ads, a-coorma.adb, s-widboo.ads,
	s-diflio.adb, g-souinf.ads, s-imgdec.ads, g-strhas.ads, a-cbhama.ads,
	g-shshco.adb, a-ztdeio.adb, s-gloloc.adb, a-coorma.ads, g-wispch.adb,
	s-pack03.adb, g-eacodu.adb, s-casi16.adb, s-diflio.ads, a-colien.adb,
	g-shshco.ads, a-wtmoio.adb, a-rbtgbo.adb, a-ztdeio.ads,
	system-rtems.ads, s-gloloc.ads, a-csquin.ads, a-cofuse.adb,
	g-wispch.ads, s-pack03.ads, s-casi16.ads, s-io.adb, a-colien.ads,
	g-alveop.adb, gnat.ads, s-diinio.adb, a-cfdlli.adb, g-pehage.adb,
	a-wtmoio.ads, a-stwiha.adb, a-locale.adb, a-tirsfi.adb, a-nscoty.ads,
	a-rbtgbo.ads, s-pack12.adb, a-cofuse.ads, a-sfteio.ads, s-io.ads,
	g-alveop.ads, a-cfdlli.ads, s-diinio.ads, a-stwiha.ads, g-pehage.ads,
	a-locale.ads, a-tirsfi.ads, s-pack12.ads, s-valuti.adb, g-cppexc.adb,
	system-vxworks-ppc.ads, g-memdum.adb, a-lfteio.ads, s-pack21.adb,
	s-unstyp.ads, s-valuti.ads, g-cppexc.ads, system-hpux-ia64.ads,
	g-memdum.ads, g-soccon.ads, g-altive.ads, a-crbtgo.adb, s-pack21.ads,
	a-llizti.ads, a-numaux-libc-x86.ads, s-expint.adb, s-conca8.adb,
	a-crbtgo.ads, s-pack30.adb, s-vallli.adb, s-geveop.adb, s-expint.ads,
	a-direio.adb, s-conca8.ads, a-widcha.ads, s-pack30.ads, s-vallli.ads,
	s-strhas.adb, s-geveop.ads, g-md5.adb, a-direio.ads, a-numaux.ads,
	s-ransee.adb, a-szbzha.adb, i-cobol.adb, g-busorg.adb, s-strhas.ads,
	g-md5.ads, s-widenu.adb, s-ransee.ads, s-widllu.adb, a-szbzha.ads,
	a-ststio.adb, i-cobol.ads, g-busorg.ads, g-regpat.adb, s-widenu.ads,
	a-secain.adb, s-widllu.ads, s-pack13.adb, g-encstr.adb, a-ztcoau.adb,
	a-ststio.ads, s-widwch.adb, g-regpat.ads, s-atacco.adb, a-cborse.adb,
	a-secain.ads, s-pack13.ads, g-encstr.ads, a-ztcoau.ads, s-widwch.ads,
	g-io_aux.adb, s-atacco.ads, a-ncelfu.ads, interfac.ads, a-cborse.ads,
	g-regexp.adb, s-pack22.adb, a-szuzti.adb, g-io_aux.ads, s-caun32.adb,
	a-nselfu.ads, g-regexp.ads, s-pack22.ads, a-ticoio.adb, a-szuzti.ads,
	g-diopit.adb, s-caun32.ads, s-conca9.adb, a-tags.adb, a-swmwco.ads,
	a-sbecin.adb, s-pack31.adb, s-expuns.adb, a-ticoio.ads, s-valint.adb,
	s-conca9.ads, g-diopit.ads, a-tags.ads, a-nllcef.ads, a-izteio.ads,
	a-sbecin.ads, s-expuns.ads, s-pack31.ads, g-dyntab.adb, s-powtab.ads,
	s-flocon-none.adb, s-valint.ads, a-ssiwti.ads, s-mmosin-mingw.adb,
	s-pack40.adb, s-pack05.adb, a-ztflau.adb, g-dyntab.ads,
	a-szuzti-shared.adb, g-alvevi.ads, a-stwise.adb, s-mmosin-mingw.ads,
	s-pack40.ads, a-diocst.adb, a-ztflau.ads, s-pack05.ads, a-nlcoty.ads,
	a-contai.ads, a-stwisu.adb, g-byorma.adb, a-siwtio.ads, a-stwise.ads,
	s-regpat.adb, g-mbdira.adb, s-pack14.adb, a-diocst.ads, g-flocon.ads,
	g-mbflra.adb, a-ztinau.adb, s-dim.ads, s-mantis.adb, a-stwisu.ads,
	g-byorma.ads, s-atopri.adb, g-wistsp.ads, a-uncdea.ads, s-widcha.adb,
	a-caldel.adb, s-regpat.ads, g-mbdira.ads, a-tiflio.adb, s-pack14.ads,
	s-parame.adb, a-liwtio.ads, s-memory.adb, g-mbflra.ads, a-ztinau.ads,
	a-wtgeau.adb, s-direio.adb, s-mantis.ads, s-atopri.ads, s-widcha.ads,
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	a-llftio.ads, s-memory.ads, s-regexp.adb, a-wtgeau.ads, a-exexda.adb,
	s-direio.ads, s-pack23.ads, g-stheme.adb, a-tiinio.adb, g-sestin.ads,
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	a-ztmoau.adb, a-cohata.ads, a-wtfiio.ads, s-imgrea.adb, ada.ads,
	a-szunau-shared.adb, a-comutr.ads, s-valuns.adb, a-ztmoau.ads,
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	a-elchha.adb, s-pack33.ads, a-cofuve.adb, s-parame-vxworks.ads,
	a-ciorma.ads, system-darwin-x86.ads, s-multip.adb, a-stwiun-shared.adb,
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	a-coormu.adb, a-siocst.adb, s-win32.ads, a-elchha.ads, s-pack42.adb,
	s-pack07.adb, a-cofuve.ads, system-hpux.ads, a-teioed.adb,
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	s-osprim-mingw.adb, s-casi64.adb, g-strspl.ads, g-socthi.ads,
	g-socket-dummy.adb, s-pack51.ads, s-dimmks.ads, s-casi64.ads,
	a-wtenau.adb, s-stchop-vxworks.adb, s-pack60.adb,
	system-solaris-sparc.ads, s-pack25.adb, g-socket-dummy.ads,
	a-exstat.adb, a-cofuma.adb, s-tsmona-linux.adb, a-wtenau.ads,
	s-pack60.ads, s-pack25.ads, i-cstrea.adb, a-cofuma.ads, g-exptty.adb,
	a-chzla1.ads, s-pack34.adb, i-cstrea.ads, s-excdeb.adb, a-iteint.ads,
	g-exptty.ads, i-pacdec.adb, s-pack34.ads, s-rident.ads, s-sopco3.adb,
	i-vxwork.ads, s-excdeb.ads, system-linux-ppc.ads, a-swuwti-shared.adb,
	s-widlli.adb, s-pack43.adb, i-pacdec.ads, a-cwila9.ads, s-sopco3.ads,
	a-fwteio.ads, s-widlli.ads, s-pack43.ads, a-suhcin.adb, a-wtdeau.adb,
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	s-pack52.adb, a-llctio.ads, a-nucoar.ads, s-pack17.adb, a-suhcin.ads,
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	a-ztfiio.ads, system-darwin-arm.ads: Move non-tasking runtime sources
	to libgnat subdirectory.

From-SVN: r251902

1 files changed, 1488 insertions, 0 deletions

diff --git a/gcc/ada/libgnat/g-awk.adb b/gcc/ada/libgnat/g-awk.adb
new file mode 100644
index 0000000..5086c02
--- /dev/null
+++ b/gcc/ada/libgnat/g-awk.adb
@@ -0,0 +1,1488 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                              G N A T . A W K                             --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--                     Copyright (C) 2000-2017, AdaCore                     --
+--                                                                          --
+-- 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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with Ada.Exceptions;
+with Ada.Text_IO;
+with Ada.Strings.Unbounded;
+with Ada.Strings.Fixed;
+with Ada.Strings.Maps;
+with Ada.Unchecked_Deallocation;
+
+with GNAT.Directory_Operations;
+with GNAT.Dynamic_Tables;
+with GNAT.OS_Lib;
+
+package body GNAT.AWK is
+
+   use Ada;
+   use Ada.Strings.Unbounded;
+
+   -----------------------
+   -- Local subprograms --
+   -----------------------
+
+   --  The following two subprograms provide a functional interface to the
+   --  two special session variables, that are manipulated explicitly by
+   --  Finalize, but must be declared after Finalize to prevent static
+   --  elaboration warnings.
+
+   function Get_Def return Session_Data_Access;
+   procedure Set_Cur;
+
+   ----------------
+   -- Split mode --
+   ----------------
+
+   package Split is
+
+      type Mode is abstract tagged null record;
+      --  This is the main type which is declared abstract. This type must be
+      --  derived for each split style.
+
+      type Mode_Access is access Mode'Class;
+
+      procedure Current_Line (S : Mode; Session : Session_Type)
+        is abstract;
+      --  Split current line of Session using split mode S
+
+      ------------------------
+      -- Split on separator --
+      ------------------------
+
+      type Separator (Size : Positive) is new Mode with record
+         Separators : String (1 .. Size);
+      end record;
+
+      procedure Current_Line
+        (S       : Separator;
+         Session : Session_Type);
+
+      ---------------------
+      -- Split on column --
+      ---------------------
+
+      type Column (Size : Positive) is new Mode with record
+         Columns : Widths_Set (1 .. Size);
+      end record;
+
+      procedure Current_Line (S : Column; Session : Session_Type);
+
+   end Split;
+
+   procedure Free is new Unchecked_Deallocation
+     (Split.Mode'Class, Split.Mode_Access);
+
+   ----------------
+   -- File_Table --
+   ----------------
+
+   type AWK_File is access String;
+
+   package File_Table is
+      new Dynamic_Tables (AWK_File, Natural, 1, 5, 50);
+   --  List of file names associated with a Session
+
+   procedure Free is new Unchecked_Deallocation (String, AWK_File);
+
+   -----------------
+   -- Field_Table --
+   -----------------
+
+   type Field_Slice is record
+      First : Positive;
+      Last  : Natural;
+   end record;
+   --  This is a field slice (First .. Last) in session's current line
+
+   package Field_Table is
+      new Dynamic_Tables (Field_Slice, Natural, 1, 10, 100);
+   --  List of fields for the current line
+
+   --------------
+   -- Patterns --
+   --------------
+
+   --  Define all patterns style: exact string, regular expression, boolean
+   --  function.
+
+   package Patterns is
+
+      type Pattern is abstract tagged null record;
+      --  This is the main type which is declared abstract. This type must be
+      --  derived for each patterns style.
+
+      type Pattern_Access is access Pattern'Class;
+
+      function Match
+        (P       : Pattern;
+         Session : Session_Type) return Boolean
+      is abstract;
+      --  Returns True if P match for the current session and False otherwise
+
+      procedure Release (P : in out Pattern);
+      --  Release memory used by the pattern structure
+
+      --------------------------
+      -- Exact string pattern --
+      --------------------------
+
+      type String_Pattern is new Pattern with record
+         Str  : Unbounded_String;
+         Rank : Count;
+      end record;
+
+      function Match
+        (P       : String_Pattern;
+         Session : Session_Type) return Boolean;
+
+      --------------------------------
+      -- Regular expression pattern --
+      --------------------------------
+
+      type Pattern_Matcher_Access is access Regpat.Pattern_Matcher;
+
+      type Regexp_Pattern is new Pattern with record
+         Regx : Pattern_Matcher_Access;
+         Rank : Count;
+      end record;
+
+      function Match
+        (P       : Regexp_Pattern;
+         Session : Session_Type) return Boolean;
+
+      procedure Release (P : in out Regexp_Pattern);
+
+      ------------------------------
+      -- Boolean function pattern --
+      ------------------------------
+
+      type Callback_Pattern is new Pattern with record
+         Pattern : Pattern_Callback;
+      end record;
+
+      function Match
+        (P       : Callback_Pattern;
+         Session : Session_Type) return Boolean;
+
+   end Patterns;
+
+   procedure Free is new Unchecked_Deallocation
+     (Patterns.Pattern'Class, Patterns.Pattern_Access);
+
+   -------------
+   -- Actions --
+   -------------
+
+   --  Define all action style : simple call, call with matches
+
+   package Actions is
+
+      type Action is abstract tagged null record;
+      --  This is the main type which is declared abstract. This type must be
+      --  derived for each action style.
+
+      type Action_Access is access Action'Class;
+
+      procedure Call
+        (A       : Action;
+         Session : Session_Type) is abstract;
+      --  Call action A as required
+
+      -------------------
+      -- Simple action --
+      -------------------
+
+      type Simple_Action is new Action with record
+         Proc : Action_Callback;
+      end record;
+
+      procedure Call
+        (A       : Simple_Action;
+         Session : Session_Type);
+
+      -------------------------
+      -- Action with matches --
+      -------------------------
+
+      type Match_Action is new Action with record
+         Proc : Match_Action_Callback;
+      end record;
+
+      procedure Call
+        (A       : Match_Action;
+         Session : Session_Type);
+
+   end Actions;
+
+   procedure Free is new Unchecked_Deallocation
+     (Actions.Action'Class, Actions.Action_Access);
+
+   --------------------------
+   -- Pattern/Action table --
+   --------------------------
+
+   type Pattern_Action is record
+      Pattern : Patterns.Pattern_Access;  -- If Pattern is True
+      Action  : Actions.Action_Access;    -- Action will be called
+   end record;
+
+   package Pattern_Action_Table is
+      new Dynamic_Tables (Pattern_Action, Natural, 1, 5, 50);
+
+   ------------------
+   -- Session Data --
+   ------------------
+
+   type Session_Data is record
+      Current_File : Text_IO.File_Type;
+      Current_Line : Unbounded_String;
+      Separators   : Split.Mode_Access;
+      Files        : File_Table.Instance;
+      File_Index   : Natural := 0;
+      Fields       : Field_Table.Instance;
+      Filters      : Pattern_Action_Table.Instance;
+      NR           : Natural := 0;
+      FNR          : Natural := 0;
+      Matches      : Regpat.Match_Array (0 .. 100);
+      --  Latest matches for the regexp pattern
+   end record;
+
+   procedure Free is
+      new Unchecked_Deallocation (Session_Data, Session_Data_Access);
+
+   --------------
+   -- Finalize --
+   --------------
+
+   procedure Finalize (Session : in out Session_Type) is
+   begin
+      --  We release the session data only if it is not the default session
+
+      if Session.Data /= Get_Def then
+         --  Release separators
+
+         Free (Session.Data.Separators);
+
+         Free (Session.Data);
+
+         --  Since we have closed the current session, set it to point now to
+         --  the default session.
+
+         Set_Cur;
+      end if;
+   end Finalize;
+
+   ----------------
+   -- Initialize --
+   ----------------
+
+   procedure Initialize (Session : in out Session_Type) is
+   begin
+      Session.Data := new Session_Data;
+
+      --  Initialize separators
+
+      Session.Data.Separators :=
+        new Split.Separator'(Default_Separators'Length, Default_Separators);
+
+      --  Initialize all tables
+
+      File_Table.Init  (Session.Data.Files);
+      Field_Table.Init (Session.Data.Fields);
+      Pattern_Action_Table.Init (Session.Data.Filters);
+   end Initialize;
+
+   -----------------------
+   -- Session Variables --
+   -----------------------
+
+   Def_Session : Session_Type;
+   Cur_Session : Session_Type;
+
+   ----------------------
+   -- Private Services --
+   ----------------------
+
+   function Always_True return Boolean;
+   --  A function that always returns True
+
+   function Apply_Filters
+     (Session : Session_Type) return Boolean;
+   --  Apply any filters for which the Pattern is True for Session. It returns
+   --  True if a least one filters has been applied (i.e. associated action
+   --  callback has been called).
+
+   procedure Open_Next_File
+     (Session : Session_Type);
+   pragma Inline (Open_Next_File);
+   --  Open next file for Session closing current file if needed. It raises
+   --  End_Error if there is no more file in the table.
+
+   procedure Raise_With_Info
+     (E       : Exceptions.Exception_Id;
+      Message : String;
+      Session : Session_Type);
+   pragma No_Return (Raise_With_Info);
+   --  Raises exception E with the message prepended with the current line
+   --  number and the filename if possible.
+
+   procedure Read_Line (Session : Session_Type);
+   --  Read a line for the Session and set Current_Line
+
+   procedure Split_Line (Session : Session_Type);
+   --  Split session's Current_Line according to the session separators and
+   --  set the Fields table. This procedure can be called at any time.
+
+   ----------------------
+   -- Private Packages --
+   ----------------------
+
+   -------------
+   -- Actions --
+   -------------
+
+   package body Actions is
+
+      ----------
+      -- Call --
+      ----------
+
+      procedure Call
+        (A       : Simple_Action;
+         Session : Session_Type)
+      is
+         pragma Unreferenced (Session);
+      begin
+         A.Proc.all;
+      end Call;
+
+      ----------
+      -- Call --
+      ----------
+
+      procedure Call
+        (A       : Match_Action;
+         Session : Session_Type)
+      is
+      begin
+         A.Proc (Session.Data.Matches);
+      end Call;
+
+   end Actions;
+
+   --------------
+   -- Patterns --
+   --------------
+
+   package body Patterns is
+
+      -----------
+      -- Match --
+      -----------
+
+      function Match
+        (P       : String_Pattern;
+         Session : Session_Type) return Boolean
+      is
+      begin
+         return P.Str = Field (P.Rank, Session);
+      end Match;
+
+      -----------
+      -- Match --
+      -----------
+
+      function Match
+        (P       : Regexp_Pattern;
+         Session : Session_Type) return Boolean
+      is
+         use type Regpat.Match_Location;
+      begin
+         Regpat.Match
+           (P.Regx.all, Field (P.Rank, Session), Session.Data.Matches);
+         return Session.Data.Matches (0) /= Regpat.No_Match;
+      end Match;
+
+      -----------
+      -- Match --
+      -----------
+
+      function Match
+        (P       : Callback_Pattern;
+         Session : Session_Type) return Boolean
+      is
+         pragma Unreferenced (Session);
+      begin
+         return P.Pattern.all;
+      end Match;
+
+      -------------
+      -- Release --
+      -------------
+
+      procedure Release (P : in out Pattern) is
+         pragma Unreferenced (P);
+      begin
+         null;
+      end Release;
+
+      -------------
+      -- Release --
+      -------------
+
+      procedure Release (P : in out Regexp_Pattern) is
+         procedure Free is new Unchecked_Deallocation
+           (Regpat.Pattern_Matcher, Pattern_Matcher_Access);
+      begin
+         Free (P.Regx);
+      end Release;
+
+   end Patterns;
+
+   -----------
+   -- Split --
+   -----------
+
+   package body Split is
+
+      use Ada.Strings;
+
+      ------------------
+      -- Current_Line --
+      ------------------
+
+      procedure Current_Line (S : Separator; Session : Session_Type) is
+         Line   : constant String := To_String (Session.Data.Current_Line);
+         Fields : Field_Table.Instance renames Session.Data.Fields;
+         Seps   : constant Maps.Character_Set := Maps.To_Set (S.Separators);
+
+         Start  : Natural;
+         Stop   : Natural;
+
+      begin
+         --  First field start here
+
+         Start := Line'First;
+
+         --  Record the first field start position which is the first character
+         --  in the line.
+
+         Field_Table.Increment_Last (Fields);
+         Fields.Table (Field_Table.Last (Fields)).First := Start;
+
+         loop
+            --  Look for next separator
+
+            Stop := Fixed.Index
+              (Source => Line (Start .. Line'Last),
+               Set    => Seps);
+
+            exit when Stop = 0;
+
+            Fields.Table (Field_Table.Last (Fields)).Last := Stop - 1;
+
+            --  If separators are set to the default (space and tab) we skip
+            --  all spaces and tabs following current field.
+
+            if S.Separators = Default_Separators then
+               Start := Fixed.Index
+                 (Line (Stop + 1 .. Line'Last),
+                  Maps.To_Set (Default_Separators),
+                  Outside,
+                  Strings.Forward);
+
+               if Start = 0 then
+                  Start := Stop + 1;
+               end if;
+
+            else
+               Start := Stop + 1;
+            end if;
+
+            --  Record in the field table the start of this new field
+
+            Field_Table.Increment_Last (Fields);
+            Fields.Table (Field_Table.Last (Fields)).First := Start;
+
+         end loop;
+
+         Fields.Table (Field_Table.Last (Fields)).Last := Line'Last;
+      end Current_Line;
+
+      ------------------
+      -- Current_Line --
+      ------------------
+
+      procedure Current_Line (S : Column; Session : Session_Type) is
+         Line   : constant String := To_String (Session.Data.Current_Line);
+         Fields : Field_Table.Instance renames Session.Data.Fields;
+         Start  : Positive := Line'First;
+
+      begin
+         --  Record the first field start position which is the first character
+         --  in the line.
+
+         for C in 1 .. S.Columns'Length loop
+
+            Field_Table.Increment_Last (Fields);
+
+            Fields.Table (Field_Table.Last (Fields)).First := Start;
+
+            Start := Start + S.Columns (C);
+
+            Fields.Table (Field_Table.Last (Fields)).Last := Start - 1;
+
+         end loop;
+
+         --  If there is some remaining character on the line, add them in a
+         --  new field.
+
+         if Start - 1 < Line'Length then
+
+            Field_Table.Increment_Last (Fields);
+
+            Fields.Table (Field_Table.Last (Fields)).First := Start;
+
+            Fields.Table (Field_Table.Last (Fields)).Last := Line'Last;
+         end if;
+      end Current_Line;
+
+   end Split;
+
+   --------------
+   -- Add_File --
+   --------------
+
+   procedure Add_File
+     (Filename : String;
+      Session  : Session_Type)
+   is
+      Files : File_Table.Instance renames Session.Data.Files;
+
+   begin
+      if OS_Lib.Is_Regular_File (Filename) then
+         File_Table.Increment_Last (Files);
+         Files.Table (File_Table.Last (Files)) := new String'(Filename);
+      else
+         Raise_With_Info
+           (File_Error'Identity,
+            "File " & Filename & " not found.",
+            Session);
+      end if;
+   end Add_File;
+
+   procedure Add_File
+     (Filename : String)
+   is
+
+   begin
+      Add_File (Filename, Cur_Session);
+   end Add_File;
+
+   ---------------
+   -- Add_Files --
+   ---------------
+
+   procedure Add_Files
+     (Directory             : String;
+      Filenames             : String;
+      Number_Of_Files_Added : out Natural;
+      Session               : Session_Type)
+   is
+      use Directory_Operations;
+
+      Dir      : Dir_Type;
+      Filename : String (1 .. 200);
+      Last     : Natural;
+
+   begin
+      Number_Of_Files_Added := 0;
+
+      Open (Dir, Directory);
+
+      loop
+         Read (Dir, Filename, Last);
+         exit when Last = 0;
+
+         Add_File (Filename (1 .. Last), Session);
+         Number_Of_Files_Added := Number_Of_Files_Added + 1;
+      end loop;
+
+      Close (Dir);
+
+   exception
+      when others =>
+         Raise_With_Info
+           (File_Error'Identity,
+            "Error scanning directory " & Directory
+            & " for files " & Filenames & '.',
+            Session);
+   end Add_Files;
+
+   procedure Add_Files
+     (Directory             : String;
+      Filenames             : String;
+      Number_Of_Files_Added : out Natural)
+   is
+
+   begin
+      Add_Files (Directory, Filenames, Number_Of_Files_Added, Cur_Session);
+   end Add_Files;
+
+   -----------------
+   -- Always_True --
+   -----------------
+
+   function Always_True return Boolean is
+   begin
+      return True;
+   end Always_True;
+
+   -------------------
+   -- Apply_Filters --
+   -------------------
+
+   function Apply_Filters
+     (Session : Session_Type) return Boolean
+   is
+      Filters : Pattern_Action_Table.Instance renames Session.Data.Filters;
+      Results : Boolean := False;
+
+   begin
+      --  Iterate through the filters table, if pattern match call action
+
+      for F in 1 .. Pattern_Action_Table.Last (Filters) loop
+         if Patterns.Match (Filters.Table (F).Pattern.all, Session) then
+            Results := True;
+            Actions.Call (Filters.Table (F).Action.all, Session);
+         end if;
+      end loop;
+
+      return Results;
+   end Apply_Filters;
+
+   -----------
+   -- Close --
+   -----------
+
+   procedure Close (Session : Session_Type) is
+      Filters : Pattern_Action_Table.Instance renames Session.Data.Filters;
+      Files   : File_Table.Instance renames Session.Data.Files;
+
+   begin
+      --  Close current file if needed
+
+      if Text_IO.Is_Open (Session.Data.Current_File) then
+         Text_IO.Close (Session.Data.Current_File);
+      end if;
+
+      --  Release Filters table
+
+      for F in 1 .. Pattern_Action_Table.Last (Filters) loop
+         Patterns.Release (Filters.Table (F).Pattern.all);
+         Free (Filters.Table (F).Pattern);
+         Free (Filters.Table (F).Action);
+      end loop;
+
+      for F in 1 .. File_Table.Last (Files) loop
+         Free (Files.Table (F));
+      end loop;
+
+      File_Table.Set_Last (Session.Data.Files, 0);
+      Field_Table.Set_Last (Session.Data.Fields, 0);
+      Pattern_Action_Table.Set_Last (Session.Data.Filters, 0);
+
+      Session.Data.NR := 0;
+      Session.Data.FNR := 0;
+      Session.Data.File_Index := 0;
+      Session.Data.Current_Line := Null_Unbounded_String;
+   end Close;
+
+   ---------------------
+   -- Current_Session --
+   ---------------------
+
+   function Current_Session return not null access Session_Type is
+   begin
+      return Cur_Session.Self;
+   end Current_Session;
+
+   ---------------------
+   -- Default_Session --
+   ---------------------
+
+   function Default_Session return not null access Session_Type is
+   begin
+      return Def_Session.Self;
+   end Default_Session;
+
+   --------------------
+   -- Discrete_Field --
+   --------------------
+
+   function Discrete_Field
+     (Rank    : Count;
+      Session : Session_Type) return Discrete
+   is
+   begin
+      return Discrete'Value (Field (Rank, Session));
+   end Discrete_Field;
+
+   function Discrete_Field_Current_Session
+     (Rank    : Count) return Discrete is
+      function Do_It is new Discrete_Field (Discrete);
+   begin
+      return Do_It (Rank, Cur_Session);
+   end Discrete_Field_Current_Session;
+
+   -----------------
+   -- End_Of_Data --
+   -----------------
+
+   function End_Of_Data
+     (Session : Session_Type) return Boolean
+   is
+   begin
+      return Session.Data.File_Index = File_Table.Last (Session.Data.Files)
+        and then End_Of_File (Session);
+   end End_Of_Data;
+
+   function End_Of_Data
+     return Boolean
+   is
+   begin
+      return End_Of_Data (Cur_Session);
+   end End_Of_Data;
+
+   -----------------
+   -- End_Of_File --
+   -----------------
+
+   function End_Of_File
+     (Session : Session_Type) return Boolean
+   is
+   begin
+      return Text_IO.End_Of_File (Session.Data.Current_File);
+   end End_Of_File;
+
+   function End_Of_File
+     return Boolean
+   is
+   begin
+      return End_Of_File (Cur_Session);
+   end End_Of_File;
+
+   -----------
+   -- Field --
+   -----------
+
+   function Field
+     (Rank    : Count;
+      Session : Session_Type) return String
+   is
+      Fields : Field_Table.Instance renames Session.Data.Fields;
+
+   begin
+      if Rank > Number_Of_Fields (Session) then
+         Raise_With_Info
+           (Field_Error'Identity,
+            "Field number" & Count'Image (Rank) & " does not exist.",
+            Session);
+
+      elsif Rank = 0 then
+
+         --  Returns the whole line, this is what $0 does under Session_Type
+
+         return To_String (Session.Data.Current_Line);
+
+      else
+         return Slice (Session.Data.Current_Line,
+                       Fields.Table (Positive (Rank)).First,
+                       Fields.Table (Positive (Rank)).Last);
+      end if;
+   end Field;
+
+   function Field
+     (Rank    : Count) return String
+   is
+   begin
+      return Field (Rank, Cur_Session);
+   end Field;
+
+   function Field
+     (Rank    : Count;
+      Session : Session_Type) return Integer
+   is
+   begin
+      return Integer'Value (Field (Rank, Session));
+
+   exception
+      when Constraint_Error =>
+         Raise_With_Info
+           (Field_Error'Identity,
+            "Field number" & Count'Image (Rank)
+            & " cannot be converted to an integer.",
+            Session);
+   end Field;
+
+   function Field
+     (Rank    : Count) return Integer
+   is
+   begin
+      return Field (Rank, Cur_Session);
+   end Field;
+
+   function Field
+     (Rank    : Count;
+      Session : Session_Type) return Float
+   is
+   begin
+      return Float'Value (Field (Rank, Session));
+
+   exception
+      when Constraint_Error =>
+         Raise_With_Info
+           (Field_Error'Identity,
+            "Field number" & Count'Image (Rank)
+            & " cannot be converted to a float.",
+            Session);
+   end Field;
+
+   function Field
+     (Rank    : Count) return Float
+   is
+   begin
+      return Field (Rank, Cur_Session);
+   end Field;
+
+   ----------
+   -- File --
+   ----------
+
+   function File
+     (Session : Session_Type) return String
+   is
+      Files : File_Table.Instance renames Session.Data.Files;
+
+   begin
+      if Session.Data.File_Index = 0 then
+         return "??";
+      else
+         return Files.Table (Session.Data.File_Index).all;
+      end if;
+   end File;
+
+   function File
+     return String
+   is
+   begin
+      return File (Cur_Session);
+   end File;
+
+   --------------------
+   -- For_Every_Line --
+   --------------------
+
+   procedure For_Every_Line
+     (Separators : String        := Use_Current;
+      Filename   : String        := Use_Current;
+      Callbacks  : Callback_Mode := None;
+      Session    : Session_Type)
+   is
+      Quit : Boolean;
+
+   begin
+      Open (Separators, Filename, Session);
+
+      while not End_Of_Data (Session) loop
+         Read_Line (Session);
+         Split_Line (Session);
+
+         if Callbacks in Only .. Pass_Through then
+            declare
+               Discard : Boolean;
+            begin
+               Discard := Apply_Filters (Session);
+            end;
+         end if;
+
+         if Callbacks /= Only then
+            Quit := False;
+            Action (Quit);
+            exit when Quit;
+         end if;
+      end loop;
+
+      Close (Session);
+   end For_Every_Line;
+
+   procedure For_Every_Line_Current_Session
+     (Separators : String        := Use_Current;
+      Filename   : String        := Use_Current;
+      Callbacks  : Callback_Mode := None)
+   is
+      procedure Do_It is new For_Every_Line (Action);
+   begin
+      Do_It (Separators, Filename, Callbacks, Cur_Session);
+   end For_Every_Line_Current_Session;
+
+   --------------
+   -- Get_Line --
+   --------------
+
+   procedure Get_Line
+     (Callbacks : Callback_Mode := None;
+      Session   : Session_Type)
+   is
+      Filter_Active : Boolean;
+
+   begin
+      if not Text_IO.Is_Open (Session.Data.Current_File) then
+         raise File_Error;
+      end if;
+
+      loop
+         Read_Line (Session);
+         Split_Line (Session);
+
+         case Callbacks is
+            when None =>
+               exit;
+
+            when Only =>
+               Filter_Active := Apply_Filters (Session);
+               exit when not Filter_Active;
+
+            when Pass_Through =>
+               Filter_Active := Apply_Filters (Session);
+               exit;
+         end case;
+      end loop;
+   end Get_Line;
+
+   procedure Get_Line
+     (Callbacks : Callback_Mode := None)
+   is
+   begin
+      Get_Line (Callbacks, Cur_Session);
+   end Get_Line;
+
+   ----------------------
+   -- Number_Of_Fields --
+   ----------------------
+
+   function Number_Of_Fields
+     (Session : Session_Type) return Count
+   is
+   begin
+      return Count (Field_Table.Last (Session.Data.Fields));
+   end Number_Of_Fields;
+
+   function Number_Of_Fields
+     return Count
+   is
+   begin
+      return Number_Of_Fields (Cur_Session);
+   end Number_Of_Fields;
+
+   --------------------------
+   -- Number_Of_File_Lines --
+   --------------------------
+
+   function Number_Of_File_Lines
+     (Session : Session_Type) return Count
+   is
+   begin
+      return Count (Session.Data.FNR);
+   end Number_Of_File_Lines;
+
+   function Number_Of_File_Lines
+     return Count
+   is
+   begin
+      return Number_Of_File_Lines (Cur_Session);
+   end Number_Of_File_Lines;
+
+   ---------------------
+   -- Number_Of_Files --
+   ---------------------
+
+   function Number_Of_Files
+     (Session : Session_Type) return Natural
+   is
+      Files : File_Table.Instance renames Session.Data.Files;
+   begin
+      return File_Table.Last (Files);
+   end Number_Of_Files;
+
+   function Number_Of_Files
+     return Natural
+   is
+   begin
+      return Number_Of_Files (Cur_Session);
+   end Number_Of_Files;
+
+   ---------------------
+   -- Number_Of_Lines --
+   ---------------------
+
+   function Number_Of_Lines
+     (Session : Session_Type) return Count
+   is
+   begin
+      return Count (Session.Data.NR);
+   end Number_Of_Lines;
+
+   function Number_Of_Lines
+     return Count
+   is
+   begin
+      return Number_Of_Lines (Cur_Session);
+   end Number_Of_Lines;
+
+   ----------
+   -- Open --
+   ----------
+
+   procedure Open
+     (Separators : String       := Use_Current;
+      Filename   : String       := Use_Current;
+      Session    : Session_Type)
+   is
+   begin
+      if Text_IO.Is_Open (Session.Data.Current_File) then
+         raise Session_Error;
+      end if;
+
+      if Filename /= Use_Current then
+         File_Table.Init (Session.Data.Files);
+         Add_File (Filename, Session);
+      end if;
+
+      if Separators /= Use_Current then
+         Set_Field_Separators (Separators, Session);
+      end if;
+
+      Open_Next_File (Session);
+
+   exception
+      when End_Error =>
+         raise File_Error;
+   end Open;
+
+   procedure Open
+     (Separators : String       := Use_Current;
+      Filename   : String       := Use_Current)
+   is
+   begin
+      Open (Separators, Filename, Cur_Session);
+   end Open;
+
+   --------------------
+   -- Open_Next_File --
+   --------------------
+
+   procedure Open_Next_File
+     (Session : Session_Type)
+   is
+      Files : File_Table.Instance renames Session.Data.Files;
+
+   begin
+      if Text_IO.Is_Open (Session.Data.Current_File) then
+         Text_IO.Close (Session.Data.Current_File);
+      end if;
+
+      Session.Data.File_Index := Session.Data.File_Index + 1;
+
+      --  If there are no mores file in the table, raise End_Error
+
+      if Session.Data.File_Index > File_Table.Last (Files) then
+         raise End_Error;
+      end if;
+
+      Text_IO.Open
+        (File => Session.Data.Current_File,
+         Name => Files.Table (Session.Data.File_Index).all,
+         Mode => Text_IO.In_File);
+   end Open_Next_File;
+
+   -----------
+   -- Parse --
+   -----------
+
+   procedure Parse
+     (Separators : String       := Use_Current;
+      Filename   : String       := Use_Current;
+      Session    : Session_Type)
+   is
+      Filter_Active : Boolean;
+      pragma Unreferenced (Filter_Active);
+
+   begin
+      Open (Separators, Filename, Session);
+
+      while not End_Of_Data (Session) loop
+         Get_Line (None, Session);
+         Filter_Active := Apply_Filters (Session);
+      end loop;
+
+      Close (Session);
+   end Parse;
+
+   procedure Parse
+     (Separators : String       := Use_Current;
+      Filename   : String       := Use_Current)
+   is
+   begin
+      Parse (Separators, Filename, Cur_Session);
+   end Parse;
+
+   ---------------------
+   -- Raise_With_Info --
+   ---------------------
+
+   procedure Raise_With_Info
+     (E       : Exceptions.Exception_Id;
+      Message : String;
+      Session : Session_Type)
+   is
+      function Filename return String;
+      --  Returns current filename and "??" if this information is not
+      --  available.
+
+      function Line return String;
+      --  Returns current line number without the leading space
+
+      --------------
+      -- Filename --
+      --------------
+
+      function Filename return String is
+         File : constant String := AWK.File (Session);
+      begin
+         if File = "" then
+            return "??";
+         else
+            return File;
+         end if;
+      end Filename;
+
+      ----------
+      -- Line --
+      ----------
+
+      function Line return String is
+         L : constant String := Natural'Image (Session.Data.FNR);
+      begin
+         return L (2 .. L'Last);
+      end Line;
+
+   --  Start of processing for Raise_With_Info
+
+   begin
+      Exceptions.Raise_Exception
+        (E,
+         '[' & Filename & ':' & Line & "] " & Message);
+      raise Constraint_Error; -- to please GNAT as this is a No_Return proc
+   end Raise_With_Info;
+
+   ---------------
+   -- Read_Line --
+   ---------------
+
+   procedure Read_Line (Session : Session_Type) is
+
+      function Read_Line return String;
+      --  Read a line in the current file. This implementation is recursive
+      --  and does not have a limitation on the line length.
+
+      NR  : Natural renames Session.Data.NR;
+      FNR : Natural renames Session.Data.FNR;
+
+      ---------------
+      -- Read_Line --
+      ---------------
+
+      function Read_Line return String is
+         Buffer : String (1 .. 1_024);
+         Last   : Natural;
+
+      begin
+         Text_IO.Get_Line (Session.Data.Current_File, Buffer, Last);
+
+         if Last = Buffer'Last then
+            return Buffer & Read_Line;
+         else
+            return Buffer (1 .. Last);
+         end if;
+      end Read_Line;
+
+   --  Start of processing for Read_Line
+
+   begin
+      if End_Of_File (Session) then
+         Open_Next_File (Session);
+         FNR := 0;
+      end if;
+
+      Session.Data.Current_Line := To_Unbounded_String (Read_Line);
+
+      NR := NR + 1;
+      FNR := FNR + 1;
+   end Read_Line;
+
+   --------------
+   -- Register --
+   --------------
+
+   procedure Register
+     (Field   : Count;
+      Pattern : String;
+      Action  : Action_Callback;
+      Session : Session_Type)
+   is
+      Filters   : Pattern_Action_Table.Instance renames Session.Data.Filters;
+      U_Pattern : constant Unbounded_String := To_Unbounded_String (Pattern);
+
+   begin
+      Pattern_Action_Table.Increment_Last (Filters);
+
+      Filters.Table (Pattern_Action_Table.Last (Filters)) :=
+        (Pattern => new Patterns.String_Pattern'(U_Pattern, Field),
+         Action  => new Actions.Simple_Action'(Proc => Action));
+   end Register;
+
+   procedure Register
+     (Field   : Count;
+      Pattern : String;
+      Action  : Action_Callback)
+   is
+   begin
+      Register (Field, Pattern, Action, Cur_Session);
+   end Register;
+
+   procedure Register
+     (Field   : Count;
+      Pattern : GNAT.Regpat.Pattern_Matcher;
+      Action  : Action_Callback;
+      Session : Session_Type)
+   is
+      Filters : Pattern_Action_Table.Instance renames Session.Data.Filters;
+
+      A_Pattern : constant Patterns.Pattern_Matcher_Access :=
+                    new Regpat.Pattern_Matcher'(Pattern);
+   begin
+      Pattern_Action_Table.Increment_Last (Filters);
+
+      Filters.Table (Pattern_Action_Table.Last (Filters)) :=
+        (Pattern => new Patterns.Regexp_Pattern'(A_Pattern, Field),
+         Action  => new Actions.Simple_Action'(Proc => Action));
+   end Register;
+
+   procedure Register
+     (Field   : Count;
+      Pattern : GNAT.Regpat.Pattern_Matcher;
+      Action  : Action_Callback)
+   is
+   begin
+      Register (Field, Pattern, Action, Cur_Session);
+   end Register;
+
+   procedure Register
+     (Field   : Count;
+      Pattern : GNAT.Regpat.Pattern_Matcher;
+      Action  : Match_Action_Callback;
+      Session : Session_Type)
+   is
+      Filters : Pattern_Action_Table.Instance renames Session.Data.Filters;
+
+      A_Pattern : constant Patterns.Pattern_Matcher_Access :=
+                    new Regpat.Pattern_Matcher'(Pattern);
+   begin
+      Pattern_Action_Table.Increment_Last (Filters);
+
+      Filters.Table (Pattern_Action_Table.Last (Filters)) :=
+        (Pattern => new Patterns.Regexp_Pattern'(A_Pattern, Field),
+         Action  => new Actions.Match_Action'(Proc => Action));
+   end Register;
+
+   procedure Register
+     (Field   : Count;
+      Pattern : GNAT.Regpat.Pattern_Matcher;
+      Action  : Match_Action_Callback)
+   is
+   begin
+      Register (Field, Pattern, Action, Cur_Session);
+   end Register;
+
+   procedure Register
+     (Pattern : Pattern_Callback;
+      Action  : Action_Callback;
+      Session : Session_Type)
+   is
+      Filters : Pattern_Action_Table.Instance renames Session.Data.Filters;
+
+   begin
+      Pattern_Action_Table.Increment_Last (Filters);
+
+      Filters.Table (Pattern_Action_Table.Last (Filters)) :=
+        (Pattern => new Patterns.Callback_Pattern'(Pattern => Pattern),
+         Action  => new Actions.Simple_Action'(Proc => Action));
+   end Register;
+
+   procedure Register
+     (Pattern : Pattern_Callback;
+      Action  : Action_Callback)
+   is
+   begin
+      Register (Pattern, Action, Cur_Session);
+   end Register;
+
+   procedure Register
+     (Action  : Action_Callback;
+      Session : Session_Type)
+   is
+   begin
+      Register (Always_True'Access, Action, Session);
+   end Register;
+
+   procedure Register
+     (Action  : Action_Callback)
+   is
+   begin
+      Register (Action, Cur_Session);
+   end Register;
+
+   -----------------
+   -- Set_Current --
+   -----------------
+
+   procedure Set_Current (Session : Session_Type) is
+   begin
+      Cur_Session.Data := Session.Data;
+   end Set_Current;
+
+   --------------------------
+   -- Set_Field_Separators --
+   --------------------------
+
+   procedure Set_Field_Separators
+     (Separators : String       := Default_Separators;
+      Session    : Session_Type)
+   is
+   begin
+      Free (Session.Data.Separators);
+
+      Session.Data.Separators :=
+        new Split.Separator'(Separators'Length, Separators);
+
+      --  If there is a current line read, split it according to the new
+      --  separators.
+
+      if Session.Data.Current_Line /= Null_Unbounded_String then
+         Split_Line (Session);
+      end if;
+   end Set_Field_Separators;
+
+   procedure Set_Field_Separators
+     (Separators : String       := Default_Separators)
+   is
+   begin
+      Set_Field_Separators (Separators, Cur_Session);
+   end Set_Field_Separators;
+
+   ----------------------
+   -- Set_Field_Widths --
+   ----------------------
+
+   procedure Set_Field_Widths
+     (Field_Widths : Widths_Set;
+      Session      : Session_Type)
+   is
+   begin
+      Free (Session.Data.Separators);
+
+      Session.Data.Separators :=
+        new Split.Column'(Field_Widths'Length, Field_Widths);
+
+      --  If there is a current line read, split it according to
+      --  the new separators.
+
+      if Session.Data.Current_Line /= Null_Unbounded_String then
+         Split_Line (Session);
+      end if;
+   end Set_Field_Widths;
+
+   procedure Set_Field_Widths
+     (Field_Widths : Widths_Set)
+   is
+   begin
+      Set_Field_Widths (Field_Widths, Cur_Session);
+   end Set_Field_Widths;
+
+   ----------------
+   -- Split_Line --
+   ----------------
+
+   procedure Split_Line (Session : Session_Type) is
+      Fields : Field_Table.Instance renames Session.Data.Fields;
+   begin
+      Field_Table.Init (Fields);
+      Split.Current_Line (Session.Data.Separators.all, Session);
+   end Split_Line;
+
+   -------------
+   -- Get_Def --
+   -------------
+
+   function Get_Def return Session_Data_Access is
+   begin
+      return Def_Session.Data;
+   end Get_Def;
+
+   -------------
+   -- Set_Cur --
+   -------------
+
+   procedure Set_Cur is
+   begin
+      Cur_Session.Data := Def_Session.Data;
+   end Set_Cur;
+
+begin
+   --  We have declared two sessions but both should share the same data.
+   --  The current session must point to the default session as its initial
+   --  value. So first we release the session data then we set current
+   --  session data to point to default session data.
+
+   Free (Cur_Session.Data);
+   Cur_Session.Data := Def_Session.Data;
+end GNAT.AWK;