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Marius Vollmer 1997-06-04 22:42:29 +00:00
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21
NEWS
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@ -40,6 +40,27 @@ instead write
The latter syntax is more consistent with existing Lisp practice. The latter syntax is more consistent with existing Lisp practice.
** Guile now does fancier printing of structures. Structures are the
underlying implementation for records, which in turn are used to
implement modules, so all of these object now print differently and in
a more informative way.
The Scheme printer will examine the builtin variable
*struct-printer* whenever it needs to print a structure object. When
this variable is not `#f' it is deemed to be a procedure and will be
applied to the structure object and the output port. When
*struct-printer* is `#f' or the procedure return `#f' the structure
object will be printed in the boring #<struct 80458270> form.
This hook is used by some routines in ice-9/boot-9.scm to implement
type specific printing routines. Please read the comments there about
"printing structs".
One of the more specific uses of structs are records. The printing
procedure that could be passed to MAKE-RECORD-TYPE is now actually
called. It should behave like a *struct-printer* procedure (described
above).
** Guile now supports a new R4RS-compliant syntax for keywords. A ** Guile now supports a new R4RS-compliant syntax for keywords. A
token of the form #:NAME, where NAME has the same syntax as a Scheme token of the form #:NAME, where NAME has the same syntax as a Scheme
symbol, is the external representation of the keyword named NAME. symbol, is the external representation of the keyword named NAME.

11
ice-9/ChangeLog
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@ -1,3 +1,14 @@
Wed Jun 4 23:27:16 1997 Marius Vollmer <mvo@zagadka.ping.de>
* boot-9.scm (struct-layout, %struct-printer-tag, struct-printer,
make-struct-printer, set-struct-printer-in-vtable!): New bindings
to support printing of structures.
(record-type-vtable, make-record-type): Add slot to hold printing
function and initialize it with something appropriate. Removed
commented out printing code.
(record-type-name, record-type-fields): Adjusted slot offsets.
(%print-module): Reduce argument list to "mod" and "port".
Sat May 31 18:57:12 1997 Gary Houston <ghouston@actrix.gen.nz> Sat May 31 18:57:12 1997 Gary Houston <ghouston@actrix.gen.nz>
* boot-9.scm: signal-handler, alarm-thunk: removed. * boot-9.scm: signal-handler, alarm-thunk: removed.

9
libguile/ChangeLog
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@ -1,3 +1,12 @@
Wed Jun 4 23:47:01 1997 Marius Vollmer <mvo@zagadka.ping.de>
* struct.c (struct_printer): New variable that holds a handle on
the Scheme variable *struct-printer*. This variable can be set by
Scheme code to override the printing of structures.
(scm_print_struct): If struct_printer is set, call it. If it is
not set, or returns #f, print the structure in the old fashion.
Include "eval.h" for scm_apply.
Tue Jun 3 23:01:39 1997 Marius Vollmer <mvo@zagadka.ping.de> Tue Jun 3 23:01:39 1997 Marius Vollmer <mvo@zagadka.ping.de>
* struct.c (scm_struct_ref, scm_struct_set_x): Use * struct.c (scm_struct_ref, scm_struct_set_x): Use