Applications and libraries/Interfacing other languages
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Tools for interfacing with other languages
The definition of a basic foreign function interface for Haskell (FFI) is finished. It has been agreed on and implemented by most Haskell implementors. The following tools already produce code for this interface. The Guide to Haskell's Foreign Function Interface provides a comparision of the different tools.
- Green Card</dt>
- Green Card is a foreign function interface preprocessor for Haskell, simplifying the task of interfacing Haskell programs to external libraries (which are normally exposed via C interfaces). Green Card is currently able to generate code compatible with the Glasgow Haskell Compiler, Hugs and nhc.
- HaskellDirect is an Interface Definition Language (IDL) compiler for Haskell, which helps interfacing Haskell code to libraries or components written in other languages (C). An IDL specification specifies the type signatures and types expected by a set of external functions. One important use of this language neutral specification of interfaces is to specify COM (Microsoft's Component Object Model) interfaces, and HaskellDirect offers special support for both using COM objects from Haskell and creating Haskell COM objects. HaskellDirect groks both the OSF DCE dialect of IDL (including the various extensions introduced by the Microsoft IDL compiler) and the OMG IIOP/CORBA dialect.
- A lightweight tool for implementing access to C libraries from Haskell.
- Haskell FFI Binding Modules Generator (HSFFIG) is a tool that takes a C library include file (.h) and generates Haskell Foreign Functions Interface import declarations for items (functions, structures, etc.) the header defines.
- A Java Native Interface for Haskell. Allows Haskell to invoke Java code. Includes a tool to generate Haskell bindings for a Java library. Works for hugs and ghc under both Linux and Windows.
- Haskell/Java VM Bridge
- A bridge to the Java virtual machine via JNI for Haskell.
- HaskellScript is the collective name for all Haskell components, both tools and libararies, that allow interaction with the COM/ActiveX framework.
- A tool to simplify the process of interfacing C libraries to Haskell. It is less powerful than HaskellDirect, but easier to use and more portable.