186 lines
6.1 KiB
Racket
186 lines
6.1 KiB
Racket
#lang racket/base
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;; Patches to sets of interests
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(provide (struct-out patch)
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(struct-out observe)
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(struct-out at-meta)
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lift-patch
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drop-patch
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strip-interests
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label-interests
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label-patch
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limit-patch
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compute-aggregate-patch
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apply-patch
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compute-patch
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biased-intersection
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view-patch
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pretty-print-patch)
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(require racket/set)
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(require racket/match)
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(require "route.rkt")
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(module+ test (require rackunit))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Patches
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(struct patch (added removed) #:prefab)
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;; Claims, Interests, and Locations
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(struct observe (pattern) #:prefab)
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(struct at-meta (claim) #:prefab)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define at-meta-proj (compile-projection (at-meta (?!))))
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(define observe-proj (compile-projection (observe (?!))))
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(define (lift-patch p)
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(match-define (patch in out) p)
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(patch (pattern->matcher #t (at-meta (embedded-matcher in)))
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(pattern->matcher #t (at-meta (embedded-matcher out)))))
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(define (drop-interests pi)
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(matcher-project pi at-meta-proj
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#:project-success (lambda (v) #t)
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#:combiner (lambda (v1 v2) #t)))
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(define (drop-patch p)
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(match-define (patch in out) p)
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(patch (drop-interests in)
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(drop-interests out)))
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(define (strip-interests g)
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(matcher-relabel g (lambda (v) #t)))
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(define (label-interests g label)
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(matcher-relabel g (lambda (v) label)))
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(define (label-patch p label)
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(patch (label-interests (patch-added p) label)
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(label-interests (patch-removed p) label)))
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(define (limit-patch p bound)
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(match-define (patch in out) p)
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(patch (matcher-subtract in bound #:combiner (lambda (v1 v2) #f))
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(matcher-intersect out bound #:combiner (lambda (v1 v2) v1))))
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(define (compute-aggregate-patch p label base)
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(define (combiner v1 v2) (matcher-subtract-combiner v1 (set-remove v2 label)))
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(patch (matcher-subtract (patch-added p) base #:combiner combiner)
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(matcher-subtract (patch-removed p) base #:combiner combiner)))
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(define (apply-patch base p)
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(match-define (patch in out) p)
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(matcher-union (matcher-subtract base out) in))
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(define (unapply-patch base p)
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(match-define (patch in out) p)
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(matcher-union (matcher-subtract base in) out))
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(define (compose-patch p2 p1) ;; p2 after p1
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(match-define (patch in1 out1) p1)
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(patch (apply-patch in1 p2)
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(unapply-patch out1 p2)))
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(define (compute-patch old-base new-base)
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(patch (matcher-subtract new-base old-base)
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(matcher-subtract old-base new-base)))
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(define (biased-intersection object subject)
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(matcher-project (matcher-intersect (observe (embedded-matcher object))
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subject
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#:combiner (lambda (v1 v2) #t))
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observe-proj
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#:project-success (lambda (v) #t)
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#:combiner (lambda (v1 v2) #t)))
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(define (view-patch p interests)
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(patch (biased-intersection (patch-added p) interests)
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(biased-intersection (patch-removed p) interests)))
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(define (pretty-print-patch p)
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(match-define (patch in out) p)
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(printf "<<<<<<<< Removed:\n")
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(pretty-print-matcher out)
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(printf "======== Added:\n")
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(pretty-print-matcher in)
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(printf ">>>>>>>>\n"))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(module+ test
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(define SP (set 'P))
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(define m0 (matcher-empty))
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(define ma (pattern->matcher SP 'a))
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(define mb (pattern->matcher SP 'b))
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(define mc (pattern->matcher SP 'c))
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(define mab (matcher-union ma mb))
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(define mbc (matcher-union mb mc))
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(define m* (pattern->matcher SP ?))
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(printf "\nmab:\n")
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(void (pretty-print-matcher mab))
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(printf "\ncompute-patch ma mb:\n")
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(void (pretty-print-patch (compute-patch ma mb)))
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(printf "\nlimit-patch m*/m0 mab:\n")
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(void (pretty-print-patch (limit-patch (patch m* m0) mab)))
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(printf "\nlimit-patch m0/m* mab:\n")
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(void (pretty-print-patch (limit-patch (patch m0 m*) mab)))
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(printf "\napply mb (limit m*/m0 mab):\n")
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(void (pretty-print-matcher (apply-patch mb (limit-patch (patch m* m0) mab))))
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(printf "\nlimit mbc/ma ma:\n")
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(void (pretty-print-patch (limit-patch (patch mbc ma) ma)))
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(printf "\nlimit mab/mc ma:\n")
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(void (pretty-print-patch (limit-patch (patch mab mc) ma)))
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(printf "\nlimit mc/mab ma:\n")
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(void (pretty-print-patch (limit-patch (patch mc mab) ma)))
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(printf "\ncompute-aggregate-patch m*/m0 Q mab:\n")
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(void (pretty-print-patch (compute-aggregate-patch (patch m* m0) 'Q mab)))
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(printf "\ncompute-aggregate-patch m0/m* Q mab:\n")
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(void (pretty-print-patch (compute-aggregate-patch (patch m0 m*) 'Q mab)))
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(printf "\ncompute-aggregate-patch m*/m0 P mab:\n")
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(void (pretty-print-patch (compute-aggregate-patch (patch m* m0) 'P mab)))
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(printf "\ncompute-aggregate-patch m0/m* P mab:\n")
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(void (pretty-print-patch (compute-aggregate-patch (patch m0 m*) 'P mab)))
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(printf "\ncompute-aggregate-patch m*/m0 Q m*:\n")
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(void (pretty-print-patch (compute-aggregate-patch (patch m* m0) 'Q m*)))
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(printf "\ncompute-aggregate-patch m0/m* Q m*:\n")
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(void (pretty-print-patch (compute-aggregate-patch (patch m0 m*) 'Q m*)))
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(printf "\ncompute-aggregate-patch m*/m0 P m*:\n")
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(void (pretty-print-patch (compute-aggregate-patch (patch m* m0) 'P m*)))
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(printf "\ncompute-aggregate-patch m0/m* P m*:\n")
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(void (pretty-print-patch (compute-aggregate-patch (patch m0 m*) 'P m*)))
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(printf "\nlift mc/mab:\n")
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(void (pretty-print-patch (lift-patch (patch mc mab))))
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(printf "\ndrop after lift mc/mab:\n")
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(void (pretty-print-patch (drop-patch (lift-patch (patch mc mab)))))
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(printf "\ncompose mbc/m0 after lift mc/mab:\n")
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(void (pretty-print-patch (compose-patch (patch mbc m0)
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(lift-patch (patch mc mab)))))
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(printf "\ndrop (compose mbc/m0 after lift mc/mab):\n")
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(void (pretty-print-patch (drop-patch (compose-patch (patch mbc m0)
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(lift-patch (patch mc mab))))))
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)
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