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The sexp widget can contain any Lisp expression, and allows the
user to edit it inline in the buffer.
The syntax for the sexp widget is:
type ::= (sexp [keyword argument]... [ value ])
This widget represents an editable field that’s useful to edit any valid s-expression.
The sexp widget takes the same keyword arguments as the
editable-field widget. See The editable-field Widget.
Its default value is nil.
A widget to edit Lisp expressions restricted to certain values or
types. Its super is the sexp widget.
It works just like the sexp widget, but it overrides the :match
function to match for certain values. To use this widget, either you
must define a :match function or give a
:match-alternatives property. The :match-alternatives
property holds a list of predicate functions to call when checking if
a given value matches the widget. Each predicate function will be
called with one argument, the value to be matched, and should return
non-nil on success.
As an example, the integer widget overrides
:match-alternatives to (integerp).