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    1: \ require.fs
    2: 
    3: \ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   20: 
   21: \ Now: Kernel Module, Reloadable
   22: 
   23: create included-files 0 , 0 , ( pointer to and count of included files )
   24: here ," ./the terminal" dup c@ swap 1 + swap , A, here 2 cells -
   25: create image-included-files  1 , A, ( pointer to and count of included files )
   26: \ included-files points to ALLOCATEd space, while image-included-files
   27: \ points to ALLOTed objects, so it survives a save-system
   28: 
   29: : loadfilename ( -- a-addr )
   30:     \G a-addr 2@ produces the current file name ( c-addr u )
   31:     included-files 2@ loadfilename# @ min 2* cells + ;
   32: 
   33: : sourcefilename ( -- c-addr u ) \ gforth
   34:     \G the name of the source file which is currently the input
   35:     \G source.  The result is valid only while the file is being
   36:     \G loaded.  If the current input source is no (stream) file, the
   37:     \G result is undefined.
   38:     loadfilename 2@ ;
   39: 
   40: : sourceline# ( -- u ) \ gforth		sourceline-number
   41:     \G the line number of the line that is currently being interpreted
   42:     \G from a (stream) file. The first line has the number 1. If the
   43:     \G current input source is no (stream) file, the result is
   44:     \G undefined.
   45:     loadline @ ;
   46: 
   47: : init-included-files ( -- )
   48:     image-included-files 2@ 2* cells save-mem drop ( addr )
   49:     image-included-files 2@ nip included-files 2! ;
   50: 
   51: : included? ( c-addr u -- f ) \ gforth
   52:     \G true, iff filename c-addr u is in included-files
   53:     included-files 2@ 0
   54:     ?do ( c-addr u addr )
   55: 	dup >r 2@ 2over compare 0=
   56: 	if
   57: 	    2drop rdrop unloop
   58: 	    true EXIT
   59: 	then
   60: 	r> cell+ cell+
   61:     loop
   62:     2drop drop false ;
   63: 
   64: : add-included-file ( c-addr u -- ) \ gforth
   65:     \G add name c-addr u to included-files
   66:     included-files 2@ 2* cells 2 cells extend-mem
   67:     2/ cell / included-files 2!
   68:     2! ;
   69: 
   70: : included1 ( i*x file-id c-addr u -- j*x ) \ gforth
   71:     \G include the file file-id with the name given by c-addr u
   72:     loadfilename# @ >r
   73:     save-mem add-included-file ( file-id )
   74:     included-files 2@ nip 1- loadfilename# !
   75:     ['] include-file catch
   76:     r> loadfilename# !
   77:     throw ;
   78:     
   79: : included ( i*x addr u -- j*x ) \ file
   80:     \G @code{include-file} the file whose name is given by the string
   81:     \G @var{addr u}.
   82:     open-fpath-file throw included1 ;
   83: 
   84: : required ( i*x addr u -- j*x ) \ gforth
   85:     \G include the file with the name given by @var{addr u}, if it is not
   86:     \G @code{included} (or @code{required}) already. Currently this
   87:     \G works by comparing the name of the file (with path) against the
   88:     \G names of earlier included files.
   89:     \ however, it may be better to fstat the file,
   90:     \ and compare the device and inode. The advantages would be: no
   91:     \ problems with several paths to the same file (e.g., due to
   92:     \ links) and we would catch files included with include-file and
   93:     \ write a require-file.
   94:     open-fpath-file throw 2dup included?
   95:     if
   96: 	2drop close-file throw
   97:     else
   98: 	included1
   99:     then ;
  100: 
  101: \ INCLUDE                                               9may93jaw
  102: 
  103: : include  ( ... "file" -- ... ) \ gforth
  104: \G includes @var{file}
  105:   name included ;
  106: 
  107: : require  ( ... "file" -- ... ) \ gforth
  108: \G includes @var{file} only if it is not included already
  109:   name required ;
  110: 
  111: 0 [IF]
  112: : \I
  113:   here 
  114:   0 word count
  115:   string,
  116:   needsrcs^ @ ! ;
  117: 
  118: : .modules
  119:   cr
  120:   needs^ @
  121:   BEGIN		dup 
  122:   WHILE		dup cell+ count type cr
  123: 		5 spaces
  124: 		dup cell+ count + aligned
  125: 		@ dup IF count type ELSE drop THEN cr
  126: 		@
  127:   REPEAT
  128:   drop ;
  129: 
  130: : loadfilename#>str ( n -- adr len )
  131: \ this converts the filenumber into the string
  132:   loadfilenamecount @ swap -
  133:   needs^ @
  134:   swap 0 ?DO dup 0= IF LEAVE THEN @ LOOP 
  135:   dup IF cell+ count ELSE drop s" NOT FOUND" THEN ;
  136: [THEN]
  137: 
  138: : loadfilename#>str ( n -- adr len )
  139:     included-files 2@ drop swap 2* cells + 2@ ;
  140: 
  141: : .modules
  142:     included-files 2@ 2* cells bounds ?DO
  143: 	cr I 2@ type  2 cells +LOOP ;  
  144: 
  145: \ contains tools/newrequire.fs
  146: \ \I $Id: require.fs,v 1.5 1998/12/08 22:03:13 anton Exp $
  147: