Annotation of gforth/kernel/require.fs, revision 1.18
1.1 anton 1: \ require.fs
2:
1.17 anton 3: \ Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.
1.1 anton 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
1.18 ! anton 19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1 anton 20:
21: \ Now: Kernel Module, Reloadable
22:
23: create included-files 0 , 0 , ( pointer to and count of included files )
1.15 anton 24: \ note: these names must not contain a "/" or "\"; otherwise a part of
25: \ that name might be used when expanding "./" (see expandtopic).
26: here ," *a file*" dup c@ swap 1 + swap
27: here ," *a block*" dup c@ swap 1 + swap
28: here ," *evaluated string*" dup c@ swap 1 + swap
29: here ," *the terminal*" dup c@ swap 1 + swap
1.14 anton 30: , A, , A, , A, , A, here 8 cells -
1.16 anton 31: create image-included-files 4 , A, ( pointer to and count of included files )
32: \ included-files points to ALLOCATEd space, while image-included-files
33: \ points to ALLOTed objects, so it survives a save-system
1.1 anton 34:
35: : sourcefilename ( -- c-addr u ) \ gforth
1.7 crook 36: \G The name of the source file which is currently the input
1.1 anton 37: \G source. The result is valid only while the file is being
38: \G loaded. If the current input source is no (stream) file, the
1.11 anton 39: \G result is undefined. In Gforth, the result is valid during the
40: \G whole seesion (but not across @code{savesystem} etc.).
1.14 anton 41: loadfilename# @ loadfilename#>str ;
1.1 anton 42:
43: : sourceline# ( -- u ) \ gforth sourceline-number
1.7 crook 44: \G The line number of the line that is currently being interpreted
1.1 anton 45: \G from a (stream) file. The first line has the number 1. If the
1.7 crook 46: \G current input source is not a (stream) file, the result is
1.1 anton 47: \G undefined.
48: loadline @ ;
49:
1.11 anton 50: : init-included-files ( -- ) \ gforth-internal
1.1 anton 51: image-included-files 2@ 2* cells save-mem drop ( addr )
52: image-included-files 2@ nip included-files 2! ;
53:
54: : included? ( c-addr u -- f ) \ gforth
1.7 crook 55: \G True only if the file @var{c-addr u} is in the list of earlier
56: \G included files. If the file has been loaded, it may have been
1.9 crook 57: \G specified as, say, @file{foo.fs} and found somewhere on the
58: \G Forth search path. To return @code{true} from @code{included?},
59: \G you must specify the exact path to the file, even if that is
60: \G @file{./foo.fs}
1.1 anton 61: included-files 2@ 0
62: ?do ( c-addr u addr )
63: dup >r 2@ 2over compare 0=
64: if
65: 2drop rdrop unloop
66: true EXIT
67: then
68: r> cell+ cell+
69: loop
70: 2drop drop false ;
71:
72: : add-included-file ( c-addr u -- ) \ gforth
73: \G add name c-addr u to included-files
74: included-files 2@ 2* cells 2 cells extend-mem
75: 2/ cell / included-files 2!
76: 2! ;
77:
78: : included1 ( i*x file-id c-addr u -- j*x ) \ gforth
1.7 crook 79: \G Include the file file-id with the name given by @var{c-addr u}.
1.1 anton 80: loadfilename# @ >r
81: save-mem add-included-file ( file-id )
82: included-files 2@ nip 1- loadfilename# !
1.14 anton 83: ['] include-file2 catch
1.1 anton 84: r> loadfilename# !
85: throw ;
86:
1.7 crook 87: : included ( i*x c-addr u -- j*x ) \ file
1.4 anton 88: \G @code{include-file} the file whose name is given by the string
1.7 crook 89: \G @var{c-addr u}.
1.3 jwilke 90: open-fpath-file throw included1 ;
1.1 anton 91:
92: : required ( i*x addr u -- j*x ) \ gforth
1.7 crook 93: \G @code{include-file} the file with the name given by @var{addr
94: \G u}, if it is not @code{included} (or @code{required})
95: \G already. Currently this works by comparing the name of the file
96: \G (with path) against the names of earlier included files.
1.4 anton 97: \ however, it may be better to fstat the file,
98: \ and compare the device and inode. The advantages would be: no
99: \ problems with several paths to the same file (e.g., due to
100: \ links) and we would catch files included with include-file and
101: \ write a require-file.
1.3 jwilke 102: open-fpath-file throw 2dup included?
1.1 anton 103: if
104: 2drop close-file throw
105: else
106: included1
107: then ;
108:
109: \ INCLUDE 9may93jaw
110:
1.4 anton 111: : include ( ... "file" -- ... ) \ gforth
1.7 crook 112: \G @code{include-file} the file @var{file}.
113: name included ;
1.1 anton 114:
1.4 anton 115: : require ( ... "file" -- ... ) \ gforth
1.7 crook 116: \G @code{include-file} @var{file} only if it is not included already.
117: name required ;
1.1 anton 118:
1.12 anton 119: \ : \I
120: \ here
121: \ 0 word count
122: \ string,
123: \ needsrcs^ @ ! ;
1.1 anton 124:
1.12 anton 125: \ : .included ( -- ) \ gforth
126: \ \G list the names of the files that have been @code{included}
127: \ cr
128: \ needs^ @
129: \ BEGIN dup
130: \ WHILE dup cell+ count type cr
131: \ 5 spaces
132: \ dup cell+ count + aligned
133: \ @ dup IF count type ELSE drop THEN cr
134: \ @
135: \ REPEAT
136: \ drop ;
1.1 anton 137:
1.12 anton 138: \ : loadfilename#>str ( n -- adr len )
139: \ \ this converts the filenumber into the string
140: \ loadfilenamecount @ swap -
141: \ needs^ @
142: \ swap 0 ?DO dup 0= IF LEAVE THEN @ LOOP
143: \ dup IF cell+ count ELSE drop s" NOT FOUND" THEN ;
1.1 anton 144:
145: : loadfilename#>str ( n -- adr len )
146: included-files 2@ drop swap 2* cells + 2@ ;
147:
1.13 anton 148: : .strings ( addr u -- ) \ gforth
149: \G list the strings from an array of string descriptors at addr
150: \G with u entries, one per line.
1.14 anton 151: 2* cells bounds ?DO
1.13 anton 152: cr I 2@ type 2 cells +LOOP ;
153:
1.10 anton 154: : .included ( -- ) \ gforth
155: \G list the names of the files that have been @code{included}
1.13 anton 156: included-files 2@ .strings ;
157:
1.1 anton 158: \ contains tools/newrequire.fs
1.18 ! anton 159: \ \I $Id: require.fs,v 1.17 2000/09/23 15:06:10 anton Exp $
1.1 anton 160:
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