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-- Initial euphoria.cabal generated by cabal init. For further documentation,
-- see
name: euphoria
synopsis: Dynamic network FRP with events and continuous values
Euphoria is FRP with practicality.
FRP is a good way to model computations which need run for an extended
period of time, react to incoming events, and continually produce
output. Simulations, games, and GUIs are all good candidates for FRP.
In Euphoria, networks (dataflow graphs) are dynamic. Networks are
first-class values which can be passed around inside of other
networks, and they can be connected together at any time. This
flexibility allows complicated, real-world problems to be modeled with
Though Euphoria is flexible and high-level, it makes some concessions
for performance and the underlying implementation.
Euphoria works in discrete steps. You will construct the body of your
program as an FRP network. To get results, you must perform an IO
action to step the network. After stepping, your network will have
produced some result, such as a string, which you can print to the
screen. A network can also produce IO actions as an output. Step the
network as many times as necessary to continue running your program.
A simulation, game, or GUI will probably loop while stepping until the
user terminates the program.
Euphoria is mostly concerned with three types: Signal, Event, and
Signal represents a continuous value that changes with each
step of the network. Discrete is like Signal, but it is possible to
determine if its value has not changed, and avoid unnecessary
computation. As long as a Signal or Discrete exists, it will contain a
value. Event represents something that exists for only one moment in
time, such as a packet received over a socket, or a mouse click.
Signals and Discretes are instances of Monad and Applicative. Events
are instances of Monoid.
SignalGen is the outer monad, where networks are constructed.
SignalGen is an instance of Monad and Applicative. SignalGens inside
of Signals, Discretes, or Events can be used to attach new networks to
the existing network on the fly.
Signals, Discretes and Events may contain other Signals, Discretes or
Events. Euphoria encourages the use of dynamic network construction
using these higher-order FRP types, and they can be attached or
detached from the network with ease. Euphoria relies on garbage
collection and weak pointers to prune the network when parts of it are
no longer needed.
Euphoria is built on top of the Elerea library by Patai Gergely.
license: PublicDomain
license-file: LICENSE
author: Takano Akio, Andrew Richards
maintainer: <Takano Akio>
-- copyright:
category: FRP
build-type: Simple
cabal-version: >=1.8
source-repository head
type: git
location: git://
exposed-modules: FRP.Euphoria.Event, FRP.Euphoria.Signal, FRP.Euphoria.Update, FRP.Euphoria.Collection, FRP.Euphoria.Abbrev
-- other-modules:
build-depends: HUnit, base, elerea >= 2.7, data-default, enummapset
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