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name:           perfect-hash-generator
version:        0.2.0.6
synopsis:       Perfect minimal hashing implementation in native Haskell
description:     A <https://en.wikipedia.org/wiki/Perfect_hash_function perfect hash function> for a set @S@ is a hash function that maps distinct elements in @S@ to a set of integers, with __no collisions__. A <https://en.wikipedia.org/wiki/Perfect_hash_function#Minimal_perfect_hash_function minimal perfect hash function> is a perfect hash function that maps @n@ keys to @n@ __consecutive__ integers, e.g. the numbers from @0@ to @n-1@.
                .
                In contrast with the <https://hackage.haskell.org/package/PerfectHash PerfectHash package>, which is a binding to a C-based library, this package is a fully-native Haskell implementation.
                .
                It is intended primarily for generating C code for embedded applications (compare to @<https://www.gnu.org/software/gperf/manual/gperf.html#Search-Structures gperf>@). The output of this tool is a pair of arrays that can be included in generated C code for __<https://en.wikipedia.org/wiki/C_dynamic_memory_allocation allocation-free> hash tables__.
                .
                Though lookups also perform reasonably well for Haskell applications, it hasn't been benchmarked thorougly with respect to other data structures.
                .
                This implementation was adapted from <http://stevehanov.ca/blog/index.php?id=119 Steve Hanov's Blog>.
                .
                = Usage
                The library is written generically to hash both strings and raw integers according to the <http://isthe.com/chongo/tech/comp/fnv/ FNV-1a algorithm>. Integers are split by octets before hashing.
                .
                > import Data.PerfectHash.Construction (createMinimalPerfectHash)
                > import qualified Data.HashMap.Strict as HashMap
                >
                > tuples = [
                >    (1000, 1)
                >  , (5555, 2)
                >  , (9876, 3)
                >  ]
                >
                > lookup_table = createMinimalPerfectHash $ HashMap.fromList tuples
                .
                Generation of C code based on the arrays in @lookup_table@ is left as an exercise to the reader. Algorithm documentation in the "Data.PerfectHash.Hashing" and "Data.PerfectHash.Lookup" modules will be helpful.
                .
                See the @hash-perfectly-strings-demo@ and @hash-perfectly-ints-demo@, as well as the test suite, for working examples.
                .
                > $ stack build
                > $ stack exec hash-perfectly-strings-demo 
category:       Data Structures, Embedded
homepage:       https://github.com/kostmo/perfect-hash-generator#readme
bug-reports:    https://github.com/kostmo/perfect-hash-generator/issues
author:         Karl Ostmo <kostmo@gmail.com>
maintainer:     Karl Ostmo <kostmo@gmail.com>
license:        Apache-2.0
license-file:   LICENSE
build-type:     Simple
cabal-version:  >= 1.10

source-repository head
  type: git
  location: https://github.com/kostmo/perfect-hash-generator

library
  hs-source-dirs:
      src
  ghc-options: -fwarn-tabs -W
  build-depends:
      base >=4.5 && <5
    , binary
    , bytestring
    , containers
    , data-ordlist
    , directory
    , filepath
    , hashable
    , text
    , unordered-containers
    , vector
  exposed-modules:
      Data.PerfectHash.Construction
      Data.PerfectHash.Hashing
      Data.PerfectHash.Lookup
  other-modules:
      Paths_perfect_hash_generator
  default-language: Haskell2010

executable hash-perfectly-ints-demo
  main-is: Main.hs
  hs-source-dirs:
      demo/ints
      test-utils
  ghc-options: -fwarn-tabs -W
  build-depends:
      base >=4.5 && <5
    , binary
    , bytestring
    , containers
    , hashable
    , optparse-applicative
    , perfect-hash-generator
    , random
    , text
    , unordered-containers
    , vector
  other-modules:
      Exercise
      Paths_perfect_hash_generator
  default-language: Haskell2010

executable hash-perfectly-strings-demo
  main-is: Main.hs
  hs-source-dirs:
      demo/strings
      test-utils
  ghc-options: -fwarn-tabs -W
  build-depends:
      base >=4.5 && <5
    , binary
    , bytestring
    , hashable
    , optparse-applicative
    , perfect-hash-generator
    , random
    , text
    , unordered-containers
    , vector
  other-modules:
      Exercise
      Paths_perfect_hash_generator
  default-language: Haskell2010

test-suite regression-tests
  type: exitcode-stdio-1.0
  main-is: Main.hs
  hs-source-dirs:
      test
      test-utils
  ghc-options: -fwarn-tabs -W
  build-depends:
      HUnit
    , base >=4.5 && <5
    , binary
    , bytestring
    , hashable
    , optparse-applicative
    , perfect-hash-generator
    , test-framework
    , test-framework-hunit
    , text
    , unordered-containers
    , vector
  other-modules:
      Exercise
      Paths_perfect_hash_generator
  default-language: Haskell2010