Hi Mark,
One other comment, you mentioned not knowing yet how to define tuple
classes in custom syntax. Here's an approach to learning how parts of
Factor like that work.
1) You can see how TUPLE: is defined:
IN: scratchpad \ TUPLE: see
USING: classes.tuple classes.tuple.parser ;
IN: syntax
SYNTAX: TUPLE: parse-tuple-definition define-tuple-class ;
2) In the listener, you can click around definitions and see how they work,
but there is a neat feature called annotations that let you watch words
when they are called for their inputs and outputs:
IN: scratchpad \ define-tuple-class watch
IN: scratchpad TUPLE: foo a b c ;
--- Entering define-tuple-class
class foo
superclass tuple
slots { "a" "b" "c" }
--- Leaving define-tuple-class
The tuple definitions support types and initial values, for example this:
TUPLE: bar
{ a fixnum }
{ b string initial: "hello" }
{ c byte-array } ;
In this case, the "slots" looks like this:
{
{ "a" fixnum }
{ "b" string initial: "hello" }
{ "c" byte-array }
}
And you can click on the values that are displayed from the annotation to
introspect more complicated objects, or ones that are displayed in a
compact format such as "{ ~array~ ~array~ }"
Best,
John.
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