combinators.smart: adding smart-reduce and smart-map-reduce.

basis/combinators/smart/smart-docs.factor

@@ -231,6 +231,14 @@ HELP: smart-with
     { "param" object } { "obj" object } { "quot" { $quotation "( param ..a -- ..b" } } { "curry" curry } }
 { $description "A version of " { $link with } " that puts the parameter before any inputs the quotation uses." } ;
 
+HELP: smart-reduce
+{ $values { "reduce-quots" sequence } }
+{ $description "A version of " { $link reduce } " that takes a sequence of " { $snippet "{ identity reduce-quot }" } " pairs, returning the " { $link reduce } " result for each pair." } ;
+
+HELP: smart-map-reduce
+{ $values { "map-reduce-quots" sequence } }
+{ $description "A version of " { $link map-reduce } " that takes a sequence of " { $snippet "{ map-quot reduce-quot }" } " pairs, returning the " { $link map-reduce } " result for each pair." } ;
+
 ARTICLE: "combinators.smart" "Smart combinators"
 "A " { $emphasis "smart combinator" } " is a macro which reflects on the stack effect of an input quotation. The " { $vocab-link "combinators.smart" } " vocabulary implements a few simple smart combinators which look at the static stack effects of input quotations and generate code which produces or consumes the relevant number of stack values." $nl
 "Take all input values from a sequence:"

basis/combinators/smart/smart-tests.factor

@@ -95,3 +95,17 @@ IN: combinators.smart.tests
 \ test-cleave>sequence def>> must-infer
 
 { V{ 34 1089 32 } } [ 33 test-cleave>sequence ] unit-test
+
+{ 60 6000 } [
+    { 10 20 30 } {
+        { 0 [ + ] }
+        { 1 [ * ] }
+    } smart-reduce
+] unit-test
+
+{ 1400 60 } [
+    { 10 20 30 } {
+        { [ sq ] [ + ] }
+        { [ ] [ + ] }
+    } smart-map-reduce
+] unit-test

basis/combinators/smart/smart.factor

@@ -1,10 +1,10 @@
-! Copyright (C) 2009, 2011 Doug Coleman.
+! Copyright (C) 2009, 2011 Doug Coleman, John Benediktsson.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: accessors arrays effects fry generalizations kernel
-macros math math.order sequences sequences.generalizations
-stack-checker stack-checker.backend stack-checker.errors
-stack-checker.values stack-checker.visitor words memoize
-combinators ;
+USING: accessors arrays assocs combinators effects fry
+generalizations kernel macros math math.order memoize sequences
+sequences.generalizations sequences.private stack-checker
+stack-checker.backend stack-checker.errors stack-checker.values
+stack-checker.visitor words ;
 IN: combinators.smart
 
 GENERIC: infer-known* ( known -- effect )
@@ -129,3 +129,15 @@ MACRO: map-reduce-outputs ( quot mapper reducer -- quot )
 
 : smart-with ( param obj quot -- obj curry )
     swapd dup inputs '[ [ _ -nrot ] dip call ] 2curry ; inline
+
+MACRO: smart-reduce ( reduce-quots -- quot )
+    unzip [ [ ] like ] bi@ dup length dup '[
+        [ @ ] dip [ @ _ cleave-curry _ spread* ] each
+    ] ;
+
+MACRO: smart-map-reduce ( map-reduce-quots -- quot )
+    [ keys ] [ [ [ ] concat-as ] [ ] map-as ] bi dup length dup '[
+        [ first _ cleave ] keep
+        [ @ _ cleave-curry _ spread* ]
+        [ 1 ] 2dip (each) (each-integer)
+    ] ;