Name:             unique-logic
Version:          0.3
License:          BSD3
License-File:     LICENSE
Author:           Henning Thielemann
Maintainer:       Henning Thielemann <haskell@henning-thielemann.de>
Homepage:         http://code.haskell.org/~thielema/unique-logic/
Category:         Logic programming
Synopsis:         Solve simple simultaneous equations
Description:
  Solve a number of equations simultaneously.
  This is not Computer Algebra,
  better think of a kind of type inference algorithm
  or logic programming with only one allowed solution.
  .
  Only one solution is computed.
  Simultaneous equations with multiple solutions are not allowed.
  However, variables may remain undefined.
  We do not even check for consistency,
  since with floating point numbers even simple rules may not be consistent.
  .
  The modules ordered with respect to abstraction level are:
  .
  * "UniqueLogic.ST.System":
    Construct and solve sets of functional dependencies.
    Example: @assignment3 (+) a b c@ meaning dependency @a+b -> c@.
  .
  * "UniqueLogic.ST.Rule":
    Combine functional dependencies to rules
    that can apply in multiple directions.
    Example: @add a b c@ means relation @a+b = c@
    which resolves to dependencies @a+b -> c, c-a -> b, c-b -> a@.
    For an executable example see "UniqueLogic.ST.Example.Rule".
  .
  * "UniqueLogic.ST.Expression":
    Allows to write rules using arithmetic operators.
    It creates temporary variables automatically.
    Example: @(a+b)*c =:= d@ resolves to @a+b = x, x*c = d@.
    For an executable example see "UniqueLogic.ST.Example.Expression".
  .
  * "UniqueLogic.ST.SystemLabel":
    Provides a new type for named variables.
    When creating a variable you decide whether and how
    an assignment to this variable shall be logged.
    There is an example that shows how to solve a logic system
    using symbolic expressions.
    The naming and logging allows us to observe shared intermediate results.
    For an executable example see "UniqueLogic.ST.Example.Label".
  .
  * "UniqueLogic.ST.SystemLog", "UniqueLogic.ST.RuleLog":
    These modules allow to log an assignment
    depending on the arguments to an assignment.
    This is more general than "UniqueLogic.ST.SystemLabel"
    which allows only dependencies on the result of an assignment.
Tested-With:       GHC==7.4.2
Cabal-Version:     >=1.8
Build-Type:        Simple

Source-Repository this
  Tag:         0.3
  Type:        darcs
  Location:    http://code.haskell.org/~thielema/unique-logic/

Source-Repository head
  Type:        darcs
  Location:    http://code.haskell.org/~thielema/unique-logic/

Library
  Build-Depends:
    transformers >=0.2 && <0.4,
    utility-ht >=0.0.1 && <0.1,
    base >= 4 && <5
  GHC-Options:      -Wall
  Hs-Source-Dirs:   src

  Exposed-Modules:
    UniqueLogic.ST.System
    UniqueLogic.ST.SystemLog
    UniqueLogic.ST.SystemLabel
    UniqueLogic.ST.Rule
    UniqueLogic.ST.RuleLog
    UniqueLogic.ST.Expression
    -- example modules
    UniqueLogic.ST.Example.Rule
    UniqueLogic.ST.Example.Label
    UniqueLogic.ST.Example.Expression

Test-Suite test-unique-logic
  Type:    exitcode-stdio-1.0
  Main-Is: src/UniqueLogic/ST/Test.hs
  GHC-Options: -Wall
  Build-Depends:
    QuickCheck >=2.4 && <2.6,
    unique-logic,
    non-empty >=0.0 && <0.1,
    transformers,
    utility-ht,
    base