cursors: unify input-cursor and assoc-cursor, give all cursors a "key" concept

extra/cursors/cursors-tests.factor

@@ -21,20 +21,6 @@ IN: cursors.tests
 [ B{ } ] [ [ { } [ , ] each ] B{ } make ] unit-test
 [ { 2 4 6 8 10 } ] [ { 1 2 3 4 5 } [ 2 * ] map ] unit-test
 
-[ { "roses: lutefisk" "tulips: lox" } ]
-[
-    [
-        { { "roses" "lutefisk" } { "tulips" "lox" } }
-        [ ": " glue , ] assoc-each
-    ] { } make
-] unit-test
-
-[ { "roses: lutefisk" "tulips: lox" } ]
-[
-    { { "roses" "lutefisk" } { "tulips" "lox" } }
-    [ ": " glue ] { } assoc>map
-] unit-test
-
 [ { "roses: lutefisk" "tulips: lox" } ]
 [
     [
@@ -65,8 +51,14 @@ IN: cursors.tests
 [ { 2 4 6 8 10 } ] [ { 1 2 3 4 5 } compile-test-map ] unit-test
 
 [ { "roses: lutefisk" "tulips: lox" } ]
-[ [ { { "roses" "lutefisk" } { "tulips" "lox" } } compile-test-assoc-each ] { } make ] unit-test
+[
+    [ H{ { "roses" "lutefisk" } { "tulips" "lox" } } compile-test-assoc-each ]
+    { } make natural-sort
+] unit-test
 
 [ { "roses: lutefisk" "tulips: lox" } ]
-[ { { "roses" "lutefisk" } { "tulips" "lox" } } compile-test-assoc>map ] unit-test
+[
+    H{ { "roses" "lutefisk" } { "tulips" "lox" } } compile-test-assoc>map
+    natural-sort
+] unit-test
 

extra/cursors/cursors.factor

@@ -61,13 +61,19 @@ ERROR: invalid-cursor cursor ;
 
 MIXIN: input-cursor
 
-GENERIC: cursor-value ( cursor -- value )
+GENERIC: cursor-key-value ( cursor -- key value )
 <PRIVATE
-GENERIC: cursor-value-unsafe ( cursor -- value )
+GENERIC: cursor-key-value-unsafe ( cursor -- key value )
 PRIVATE>
-M: input-cursor cursor-value-unsafe cursor-value ; inline
+M: input-cursor cursor-key-value-unsafe cursor-key-value ; inline
-M: input-cursor cursor-value
+M: input-cursor cursor-key-value
-    dup cursor-valid? [ cursor-value-unsafe ] [ invalid-cursor ] if ; inline
+    dup cursor-valid? [ cursor-key-value-unsafe ] [ invalid-cursor ] if ; inline
+
+: cursor-key ( cursor -- key ) cursor-key-value drop ;
+: cursor-value ( cursor -- key ) cursor-key-value nip ;
+
+: cursor-key-unsafe ( cursor -- key ) cursor-key-value-unsafe drop ;
+: cursor-value-unsafe ( cursor -- key ) cursor-key-value-unsafe nip ;
 
 !
 ! output cursors
@@ -155,7 +161,7 @@ M: numeric-cursor cursor>= [ value>> ] bi@ >= ; inline
 
 INSTANCE: numeric-cursor input-cursor
 
-M: numeric-cursor cursor-value value>> ; inline
+M: numeric-cursor cursor-key-value value>> dup ; inline
 
 !
 ! linear cursor
@@ -278,8 +284,8 @@ M: sequence-cursor cursor-distance ( cursor cursor -- n )
 
 INSTANCE: sequence-cursor input-cursor
 
-M: sequence-cursor cursor-value-unsafe [ n>> ] [ seq>> ] bi nth-unsafe ; inline
+M: sequence-cursor cursor-key-value-unsafe [ n>> dup ] [ seq>> ] bi nth-unsafe ; inline
-M: sequence-cursor cursor-value [ n>> ] [ seq>> ] bi nth ; inline
+M: sequence-cursor cursor-key-value [ n>> dup ] [ seq>> ] bi nth ; inline
 
 INSTANCE: sequence-cursor output-cursor
 
@@ -362,13 +368,9 @@ M: forward-cursor new-sequence-cursor
     over map-as ; inline
 
 !
-! assoc cursors
+! assoc combinators
 !
 
-MIXIN: assoc-cursor
-
-GENERIC: cursor-key-value ( cursor -- key value )
-
 : -assoc- ( quot -- quot' )
     '[ cursor-key-value @ ] ; inline
 
@@ -380,11 +382,6 @@ GENERIC: cursor-key-value ( cursor -- key value )
 : assoc>map ( ... assoc quot: ( ... k v -- ... newx ) exemplar -- ... newcontainer )
     [ assoc- ] dip -map-as ; inline
 
-INSTANCE: input-cursor assoc-cursor
-
-M: input-cursor cursor-key-value
-    cursor-value-unsafe first2 ; inline
-
 !
 ! hashtable cursor
 !
@@ -421,16 +418,11 @@ M: hashtable-cursor inc-cursor ( cursor -- cursor' )
     [ hashtable>> dup array>> ] [ n>> 2 + ] bi
     (inc-hashtable-cursor) <hashtable-cursor> ; inline
 
-INSTANCE: hashtable-cursor assoc-cursor
-    
-M: hashtable-cursor cursor-key-value
-    [ n>> ] [ hashtable>> array>> ] bi
-    [ nth-unsafe ] [ [ 1 + ] dip nth-unsafe ] 2bi ; inline
-
 INSTANCE: hashtable-cursor input-cursor
 
-M: hashtable-cursor cursor-value-unsafe
+M: hashtable-cursor cursor-key-value-unsafe
-    cursor-key-value 2array ; inline
+    [ n>> ] [ hashtable>> array>> ] bi
+    [ nth-unsafe ] [ [ 1 + ] dip nth-unsafe ] 2bi ; inline
 
 INSTANCE: hashtable container
 
@@ -472,7 +464,7 @@ M: zip-cursor cursor-distance-hint ( cursor cursor -- n )
 M: zip-cursor inc-cursor ( cursor -- cursor' )
     [ keys>> inc-cursor ] [ values>> inc-cursor ] bi <zip-cursor> ; inline
     
-INSTANCE: zip-cursor assoc-cursor
+INSTANCE: zip-cursor input-cursor
 
 M: zip-cursor cursor-key-value
     [ keys>> cursor-value-unsafe ] [ values>> cursor-value-unsafe ] bi ; inline