classes.maybe: make maybe's slot type a classoid so you can do maybe: union{ }. Fix prettyprinting of anonymous-union/intersection. Fixes #427, fixes #428.

basis/prettyprint/backend/backend.factor

@@ -59,7 +59,7 @@ M: word pprint*
 
 M: method pprint*
     <block
-    [ \ M\ pprint-word "method-class" word-prop pprint-class ]
+    [ \ M\ pprint-word "method-class" word-prop pprint* ]
     [ "method-generic" word-prop pprint-word ] bi
     block> ;
 
@@ -206,6 +206,8 @@ M: tuple pprint-delims drop \ T{ \ } ;
 M: wrapper pprint-delims drop \ W{ \ } ;
 M: callstack pprint-delims drop \ CS{ \ } ;
 M: hash-set pprint-delims drop \ HS{ \ } ;
+M: anonymous-union pprint-delims drop \ union{ \ } ;
+M: anonymous-intersection pprint-delims drop \ intersection{ \ } ;
 
 M: object >pprint-sequence ;
 M: vector >pprint-sequence ;
@@ -215,6 +217,8 @@ M: hashtable >pprint-sequence >alist ;
 M: wrapper >pprint-sequence wrapped>> 1array ;
 M: callstack >pprint-sequence callstack>array ;
 M: hash-set >pprint-sequence members ;
+M: anonymous-union >pprint-sequence members>> ;
+M: anonymous-intersection >pprint-sequence participants>> ;
 
 : class-slot-sequence ( class slots -- sequence )
     [ 1array ] [ [ f 2array ] dip append ] if-empty ;
@@ -253,6 +257,8 @@ M: hashtable pprint*
 M: curry pprint* pprint-object ;
 M: compose pprint* pprint-object ;
 M: hash-set pprint* pprint-object ;
+M: anonymous-union pprint* pprint-object ;
+M: anonymous-intersection pprint* pprint-object ;
 
 M: wrapper pprint*
     {
@@ -262,10 +268,4 @@ M: wrapper pprint*
     } cond ;
 
 M: maybe pprint*
-    <block \ maybe: pprint-word class>> pprint-word block> ;
-
-M: anonymous-union pprint*
-    <block \ union{ pprint-word members>> [ pprint-word ] each \ } pprint-word block> ;
-
-M: anonymous-intersection pprint*
-    <block \ intersection{ pprint-word participants>> [ pprint-word ] each \ } pprint-word block> ;
+    <block \ maybe: pprint-word class>> pprint-class block> ;

basis/prettyprint/prettyprint-tests.factor

@@ -1,11 +1,11 @@
 USING: accessors arrays classes.intersection classes.maybe
 classes.union compiler.units continuations definitions effects
-eval generic generic.standard io io.streams.duplex
+eval generic generic.standard hashtables io io.streams.duplex
 io.streams.string kernel listener make math namespaces parser
 prettyprint prettyprint.config prettyprint.private
 prettyprint.sections see sequences splitting
-tools.continuations tools.continuations.private tools.test
-vectors vocabs.parser words ;
+strings tools.continuations tools.continuations.private
+tools.test vectors vocabs.parser words ;
 IN: prettyprint.tests
 
 [ "4" ] [ 4 unparse ] unit-test
@@ -427,3 +427,25 @@ TUPLE: fo { a intersection{ fixnum integer } initial: 0 } ;
 ] [
     [ \ fo see ] with-string-writer
 ] unit-test
+
+[
+"""union{
+    union{ float integer }
+    intersection{ string hashtable }
+}
+"""
+] [ [ union{ union{ float integer } intersection{ string hashtable } } . ] with-string-writer ] unit-test
+
+[
+"""intersection{
+    union{ float integer }
+    intersection{ string hashtable }
+}
+"""
+] [ [ intersection{ union{ float integer } intersection{ string hashtable } } . ] with-string-writer ] unit-test
+
+[
+"""maybe: union{ float integer }\n"""
+] [
+    [ maybe: union{ float integer } . ] with-string-writer
+] unit-test

core/classes/maybe/maybe.factor

@@ -5,7 +5,7 @@ classes.algebra.private classes.private classes.union.private
 effects kernel words ;
 IN: classes.maybe
 
-TUPLE: maybe { class word initial: object read-only } ;
+TUPLE: maybe { class classoid initial: object read-only } ;
 
 C: <maybe> maybe