toy minikanren impl in Go lang
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examples
.travis.yml only test against 1.1 Oct 24, 2013
README.md
bench.txt
db.go
fd.go
golf_test.go
gologic.go
gologic_test.go
newsubst.go clean up substitution map bits Oct 26, 2013
redblack.go
redblack_test.go
stream.go
types.go
zebra_test.go

README.md

Gologic

Build Status

A port of core minikanren with inequality to Go based on doctor Byrd's thesis.

Provides reasoning over structs via Go's reflect package.

Provides a "database" in to which you can assert facts and then reason over the facts in the database

Usage

a,b,c := Fresh3()
ch := Run(a,Or(And(Unify(a,b),Unify(b,c),Unify(c,1)),
               And(Unify(a,b),Unify(b,c),Unify(c,3))))
if 1 == <- ch {t.Fatal("not a 1")}
if 3 == <- ch {t.Fatal("not a 3")}

gologic.Fresh() returns a fresh unbound logic var. Fresh2-6 return more logic vars at once.

gologic.Run(...) takes a logic var and a goal, and returns a channel (type chan interface{}) in to which results will be placed.

provided goals constructors are:

  • gologic.Unify(a,b)
  • gologic.Neq(a,b)
  • gologic.And(a,...)
  • gologic.Or(a,...)

a goal is a func (s S) R {...}

a goal constructor is a function that returns a goal

See gologic_test.go

examples/zebra.go has an example of solving the zebra puzzle ported from Clojure's core.logic. You can run the example like:

GOPATH=$PWD/examples go build examples/zebra.go && time ./zebra

gologic.Call is a goal constructor that is a useful helper for constructing recursive goals, by delaying the recursive call to the goal constructor until the logic program is being run. See ancestoro in gologic_test.go

Benchmarks

go test -bench '.*' 

License

The MIT License (MIT)

Copyright © 2013 Kevin Downey

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.