Changed description from

This library implements the Rattus programming language as
an embedded DSL. To this end the library provides a GHC
plugin that performs the additional checks that are
necessary for Rattus. What follows is a brief
introduction to the language and its usage. A more
detailed introduction can be found in this
<src/docs/paper.pdf paper>.

Rattus is a functional reactive programming (FRP) language
that uses modal types to ensure operational properties
that are crucial for reactive programs: productivity (in
each computation step, the program makes progress),
causality (output depends only on current and earlier
input), and no implicit space leaks (programs do not
implicitly retain memory over time).

To ensure these properties, Rattus uses the type modality
@O@ to express the concept of time at the type
level. Intuitively speaking, a value of type @O a@
represents a computation that will produce a value of type
@a@ in the next time step. Additionally, the language also
features the @Box@ type modality. A value of type @Box a@
is a time-independent computation that can be executed at
any time to produce a value of type @a@.

The core of the language is defined in the module
"Rattus.Primitives". Note that the operations on @O@ and
@Box@ have non-standard typing rules. Therefore, this
library provides a compiler plugin that checks these
non-standard typing rules. To write Rattus programs, one
must enable this plugin via the GHC option
@-fplugin=Rattus.Plugin@, e.g. by including the following
line in the source file (for better error messages we also
suggest using the option @-g2@):

> {-# OPTIONS -fplugin=Rattus.Plugin #-}

In addition, one must mark the functions that are written
in Rattus:

> {-# ANN myFunction Rattus #-}

Or mark the whole module as a Rattus module:

> {-# ANN module Rattus #-}

Below is a minimal Rattus program using the
"Rattus.Stream" module for programming with streams:

> {-# OPTIONS -fplugin=Rattus.Plugin #-}
>
> import Rattus
> import Rattus.Stream
>
> {-# ANN sums Rattus #-}
> sums :: Str Int -> Str Int
> sums = scan (box (+)) 0

The
<docs/src/Rattus.Stream.html source code of the Rattus.Stream module>
provides more examples on how to program in Rattus.

This library implements the Rattus programming language as
an embedded DSL. To this end the library provides a GHC
plugin that performs the additional checks that are
necessary for Rattus. What follows is a brief
introduction to the language and its usage. A more
detailed introduction can be found in this
<src/docs/paper.pdf paper>.

Rattus is a functional reactive programming (FRP) language
that uses modal types to ensure operational properties
that are crucial for reactive programs: productivity (in
each computation step, the program makes progress),
causality (output depends only on current and earlier
input), and no implicit space leaks (programs do not
implicitly retain memory over time).

To ensure these properties, Rattus uses the type modality
@O@ to express the concept of time at the type
level. Intuitively speaking, a value of type @O a@
represents a computation that will produce a value of type
@a@ in the next time step. Additionally, the language also
features the @Box@ type modality. A value of type @Box a@
is a time-independent computation that can be executed at
any time to produce a value of type @a@.

For example, the type of streams is defined as

> data Str a = a ::: (O (Str a))

So the head of the stream is available now, but its tail
is only available in the next time step. Writing a @map@
function for this type of streams, requires us to use the
@Box@ modality:

> map :: Box (a -> b) -> Str a -> Str b
> map f (x ::: xs) = unbox f x ::: delay (map f (adv xs))

This makes sure that the function @f@ that we give to
@map@ is available at any time in the future.

The core of the language is defined in the module
"Rattus.Primitives". Note that the operations on @O@ and
@Box@ have non-standard typing rules. Therefore, this
library provides a compiler plugin that checks these
non-standard typing rules. To write Rattus programs, one
must enable this plugin via the GHC option
@-fplugin=Rattus.Plugin@, e.g. by including the following
line in the source file (for better error messages we also
suggest using the option @-g2@):

> {-# OPTIONS -fplugin=Rattus.Plugin #-}

In addition, one must annotate the functions that are
written in Rattus:

> {-# ANN myFunction Rattus #-}

Or annotate the whole module as a Rattus module:

> {-# ANN module Rattus #-}

Below is a minimal Rattus program using the
"Rattus.Stream" module for programming with streams:

> {-# OPTIONS -fplugin=Rattus.Plugin #-}
>
> import Rattus
> import Rattus.Stream
>
> {-# ANN sums Rattus #-}
> sums :: Str Int -> Str Int
> sums = scan (box (+)) 0

The
<docs/src/Rattus.Stream.html source code of the Rattus.Stream module>
provides more examples on how to program in Rattus.

Changed description from

This library implements the Rattus programming language as
an embedded DSL. To this end the library provides a GHC
plugin that performs the additional checks that are
necessary for Rattus. What follows is a brief
introduction to the language and its usage. A more
detailed introduction can be found in this
<src/docs/paper.pdf paper>.

Rattus is a functional reactive programming (FRP) language
that uses modal types to ensure operational properties
that are crucial for reactive programs: productivity (in
each computation step, the program makes progress),
causality (output depends only on current and earlier
input), and no implicit space leaks (programs do not
implicitly retain memory over time).

To ensure these properties, Rattus uses the type modality
@O@ to express the concept of time at the type
level. Intuitively speaking, a value of type @O a@
represents a computation that will produce a value of type
@a@ in the next time step. Additionally, the language also
features the @Box@ type modality. A value of type @Box a@
is a time-independent computation that can be executed at
any time to produce a value of type @a@.

The core of the language is defined in the module
"Rattus.Primitives". Note that the operations on @O@ and
@Box@ have non-standard typing rules. Therefore, this
library provides a compiler plugin that checks these
non-standard typing rules. To write Rattus programs, one
must enable this plugin via the GHC option
@-fplugin=Rattus.Plugin@, e.g. by including the following
line in the source file (for better error messages we also
suggest using the option @-g2@):

> {-# OPTIONS -fplugin=Rattus.Plugin #-}

In addition, one must mark the functions that are written
in Rattus:

> {-# ANN myFunction Rattus #-}

Or mark the whole module as a Rattus module:

> {-# ANN module Rattus #-}

Below is a minimal Rattus program using the
"Rattus.Stream" module for programming with streams:

> {-# OPTIONS -fplugin=Rattus.Plugin #-}
>
> import Rattus
> import Rattus.Stream
>
> {-# ANN sums Rattus #-}
> sums :: Str Int -> Str Int
> sums = scan (box (+)) 0

This library implements the Rattus programming language as
an embedded DSL. To this end the library provides a GHC
plugin that performs the additional checks that are
necessary for Rattus. What follows is a brief
introduction to the language and its usage. A more
detailed introduction can be found in this
<src/docs/paper.pdf paper>.

Rattus is a functional reactive programming (FRP) language
that uses modal types to ensure operational properties
that are crucial for reactive programs: productivity (in
each computation step, the program makes progress),
causality (output depends only on current and earlier
input), and no implicit space leaks (programs do not
implicitly retain memory over time).

To ensure these properties, Rattus uses the type modality
@O@ to express the concept of time at the type
level. Intuitively speaking, a value of type @O a@
represents a computation that will produce a value of type
@a@ in the next time step. Additionally, the language also
features the @Box@ type modality. A value of type @Box a@
is a time-independent computation that can be executed at
any time to produce a value of type @a@.

The core of the language is defined in the module
"Rattus.Primitives". Note that the operations on @O@ and
@Box@ have non-standard typing rules. Therefore, this
library provides a compiler plugin that checks these
non-standard typing rules. To write Rattus programs, one
must enable this plugin via the GHC option
@-fplugin=Rattus.Plugin@, e.g. by including the following
line in the source file (for better error messages we also
suggest using the option @-g2@):

> {-# OPTIONS -fplugin=Rattus.Plugin #-}

In addition, one must mark the functions that are written
in Rattus:

> {-# ANN myFunction Rattus #-}

Or mark the whole module as a Rattus module:

> {-# ANN module Rattus #-}

Below is a minimal Rattus program using the
"Rattus.Stream" module for programming with streams:

> {-# OPTIONS -fplugin=Rattus.Plugin #-}
>
> import Rattus
> import Rattus.Stream
>
> {-# ANN sums Rattus #-}
> sums :: Str Int -> Str Int
> sums = scan (box (+)) 0

The
<docs/src/Rattus.Stream.html source code of the Rattus.Stream module>
provides more examples on how to program in Rattus.

Changed description from

This library implements the Rattus programming language as
an embedded DSL. To this end the library provides a GHC
plugin that performs the additional checks that are
necessary for Rattus. What follows is a brief
introduction to the language and its usage. A more
detailed introduction can be found in this
<docs/paper.pdf paper>.

Rattus is a functional reactive programming (FRP) language
that uses modal types to ensure operational properties
that are crucial for reactive programs: productivity (in
each computation step, the program makes progress),
causality (output depends only on current and earlier
input), and no implicit space leaks (programs do not
implicitly retain memory over time).

To ensure these properties, Rattus uses the type modality
@O@ to express the concept of time at the type
level. Intuitively speaking, a value of type @O a@
represents a computation that will produce a value of type
@a@ in the next time step. Additionally, the language also
features the @Box@ type modality. A value of type @Box a@
is a time-independent computation that can be executed at
any time to produce a value of type @a@.

The core of the language is defined in the module
"Rattus.Primitives". Note that the operations on @O@ and
@Box@ have non-standard typing rules. Therefore, this
library provides a compiler plugin that checks these
non-standard typing rules. To write Rattus programs, one
must enable this plugin via the GHC option
@-fplugin=Rattus.Plugin@, e.g. by including the following
line in the source file (for better error messages we also
suggest using the option @-g2@):

> {-# OPTIONS -fplugin=Rattus.Plugin #-}

In addition, one must mark the functions that are written
in Rattus:

> {-# ANN myFunction Rattus #-}

Or mark the whole module as a Rattus module:

> {-# ANN module Rattus #-}

Below is a minimal Rattus program using the
"Rattus.Stream" module for programming with streams:

> {-# OPTIONS -fplugin=Rattus.Plugin #-}
>
> import Rattus
> import Rattus.Stream
>
> {-# ANN sums Rattus #-}
> sums :: Str Int -> Str Int
> sums = scan (box (+)) 0

This library implements the Rattus programming language as
an embedded DSL. To this end the library provides a GHC
plugin that performs the additional checks that are
necessary for Rattus. What follows is a brief
introduction to the language and its usage. A more
detailed introduction can be found in this
<src/docs/paper.pdf paper>.

Rattus is a functional reactive programming (FRP) language
that uses modal types to ensure operational properties
that are crucial for reactive programs: productivity (in
each computation step, the program makes progress),
causality (output depends only on current and earlier
input), and no implicit space leaks (programs do not
implicitly retain memory over time).

To ensure these properties, Rattus uses the type modality
@O@ to express the concept of time at the type
level. Intuitively speaking, a value of type @O a@
represents a computation that will produce a value of type
@a@ in the next time step. Additionally, the language also
features the @Box@ type modality. A value of type @Box a@
is a time-independent computation that can be executed at
any time to produce a value of type @a@.

The core of the language is defined in the module
"Rattus.Primitives". Note that the operations on @O@ and
@Box@ have non-standard typing rules. Therefore, this
library provides a compiler plugin that checks these
non-standard typing rules. To write Rattus programs, one
must enable this plugin via the GHC option
@-fplugin=Rattus.Plugin@, e.g. by including the following
line in the source file (for better error messages we also
suggest using the option @-g2@):

> {-# OPTIONS -fplugin=Rattus.Plugin #-}

In addition, one must mark the functions that are written
in Rattus:

> {-# ANN myFunction Rattus #-}

Or mark the whole module as a Rattus module:

> {-# ANN module Rattus #-}

Below is a minimal Rattus program using the
"Rattus.Stream" module for programming with streams:

> {-# OPTIONS -fplugin=Rattus.Plugin #-}
>
> import Rattus
> import Rattus.Stream
>
> {-# ANN sums Rattus #-}
> sums :: Str Int -> Str Int
> sums = scan (box (+)) 0