Next: General files, Previous: Files, Up: Files
The simplest way to interpret the contents of a file is to use one of these two formats:
include mysource.fs s" mysource.fs" included
You usually want to include a file only if it is not included already (by, say, another source file). In that case, you can use one of these three formats:
require mysource.fs needs mysource.fs s" mysource.fs" required
It is good practice to write your source files such that interpreting them
does not change the stack. Source files designed in this way can be used with
required and friends without complications. For example:
1024 require foo.fs drop
Here you want to pass the argument 1024 (e.g., a buffer size) to
foo.fs. Interpreting foo.fs has the stack effect ( n – n
), which allows its use with
require. Of course with such
parameters to required files, you have to ensure that the first
require fits for all uses (i.e.,
require it early in the
master load file).
include-filei*x wfileid – j*x file “include-file”
Interpret (process using the text interpreter) the contents of the file wfileid.
includedi*x c-addr u – j*x file “included”
include-file the file whose name is given by the string
included?c-addr u – f gforth “included?”
True only if the file c-addr u is in the list of earlier
included files. If the file has been loaded, it may have been
specified as, say, foo.fs and found somewhere on the
Forth search path. To return
you must specify the exact path to the file, even if that is
include... "file" – ... gforth “include”
include-file the file file.
requiredi*x addr u – i*x gforth “required”
include-file the file with the name given by addr
u, if it is not
already. Currently this works by comparing the name of the file
(with path) against the names of earlier included files.
require... "file" – ... gforth “require”
include-file file only if it is not included already.
needs... "name" – ... gforth “needs”
An alias for
require; exists on other systems (e.g., Win32Forth).
sourcefilename– c-addr u gforth “sourcefilename”
The name of the source file which is currently the input
source. The result is valid only while the file is being
loaded. If the current input source is no (stream) file, the
result is undefined. In Gforth, the result is valid during the
whole seesion (but not across
sourceline#– u gforth “sourceline-number”
The line number of the line that is currently being interpreted from a (stream) file. The first line has the number 1. If the current input source is not a (stream) file, the result is undefined.
A definition in ANS Forth for
required is provided in