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| Original author(s) | Alex Jacobson |
|---|---|
| Stable release | 7.0 / March 29, 2012 |
| Repository |  |
| Operating system | Portable (requires GHC and libraries) |
| Platform | Portable |
| Available in | Haskell |
| Type | Application server |
| License | BSD-3 |
| Website | http://www.happstack.com/ |
Happstack (Haskell Application Stack) is a free application server for websites written in the functional programming language Haskell. It integrates handling Web, persistence, XML/XSLT, and templating functionality. [1]
Free software or libre software is computer software distributed under terms that allow users to run the software for any purpose as well as to study, change, and distribute it and any adapted versions. Free software is a matter of liberty, not price: users—individually or in cooperation with computer programmers—are free to do what they want with their copies of a free software regardless of how much is paid to obtain the program. Computer programs are deemed free insofar as they give users ultimate control over the first, thereby allowing them to control what their devices are programmed to do.
An application server is a software framework that provides both facilities to create web applications and a server environment to run them.
A website or Web site is a collection of related network web resources, such as web pages, multimedia content, which are typically identified with a common domain name, and published on at least one web server. Notable examples are wikipedia.org, google.com, and amazon.com.
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It makes use of a number of Haskell libraries and systems such as Parsec, Cabal, Template Haskell, and monad transformers ("Your app then is just a set of state transformer functions (in the MACID Monad) that take an event and state as input and that evaluate to a new state, a response, and a (possibly null) set of sideeffects." [1] ) among others.
Parsec is a library for writing parsers in Haskell. It is based on higher-order parser combinators, so a complicated parser can be made out of many smaller ones. It has been reimplemented in many other languages, including Erlang,, Elixir,, OCaml, and F#, as well as imperative languages such as C#, and Java.
The Haskell Cabal aids in the packaging and distribution of software packages. It is contained in the Haskell Platform.
Template Haskell is an experimental language extension to the Haskell programming language implemented in the Glasgow Haskell Compiler. In early incarnations it was also known as Template Meta-Haskell.
