hs-duktape: Haskell bindings for a very compact embedded ECMAScript (JavaScript) engine.

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Versions [faq] 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 1.0.0
Dependencies aeson, base (>=4.3.0.0 && <5), bytestring, text, transformers, unordered-containers, vector [details]
License MIT
Copyright 2015-2016 Greg V <greg@unrelenting.technology>, 2013-2016 Duktape authors
Author Greg V
Maintainer greg@unrelenting.technology
Category Web
Home page https://github.com/myfreeweb/hs-duktape
Source repo head: git clone git://github.com/myfreeweb/hs-duktape.git
Uploaded by myfreeweb at 2016-02-26T21:40:40Z
Distributions NixOS:1.0.0
Downloads 3926 total (28 in the last 30 days)
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Status Hackage Matrix CI
Docs not available [build log]
All reported builds failed as of 2016-11-27 [all 3 reports]

Modules

  • Scripting
    • Scripting.Duktape
      • Scripting.Duktape.Raw

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Maintainer's Corner

For package maintainers and hackage trustees


Readme for hs-duktape-0.1.2

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hs-duktape Hackage Build Status MIT License

Haskell bindings for duktape, a very compact embedded ECMAScript (JavaScript) engine.

Usage

Here's a simple REPL example:

module Main where

import Scripting.Duktape
import Control.Monad (forever)
import Data.ByteString.Char8 (pack)
import System.IO (hFlush, stdout)

main :: IO ()
main = do
  dukm <- createDuktapeCtx
  case dukm of
    Nothing -> putStrLn "I can't even (start Duktape)"
    Just duk -> forever $ do
      putStr "duktape> "
      hFlush stdout
      retVal <- evalDuktape duk =<< return . pack =<< getLine
      case retVal of
        Left e -> putStrLn $ "Duktape error: " ++ e
        Right Nothing -> putStrLn "No result"
        Right (Just v) -> print v

Aeson's Value type is used for exchanging values between Haskell and ECMAScript.
lens-aeson is a good library for working with Value, um, values.

You can also call functions that are on the global object (or any object that's on the global object):

dukm <- createDuktapeCtx
bresult <- callDuktape (fromJust dukm) Nothing "boolTest" [Bool True, Bool True, Bool False] -- boolTest(true, true, false)
aresult <- callDuktape (fromJust dukm) (Just "NumFuns") "sum" [Number 1, Number 2] -- NumFuns.sum(1, 2)

And expose Haskell functions (same as with calls: set on global or a property of global):

dukm <- createDuktapeCtx
let dbl (Number x) = return $ Number $ x * 2 ∷ IO Value
    dbl _ = return $ String "wtf"
reD ← exposeFnDuktape (fromJust ctx) Nothing "double" dbl 

The functions must be of type IO (), IO Value, Value -> IO Value, Value -> Value -> IO Value... and so on, up to 5 arguments. If you need more, use an Object Value, seriously.

Development

Use stack to build.

$ stack build

$ stack test && rm tests.tix

Contributing

Please feel free to submit pull requests!

By participating in this project you agree to follow the Contributor Code of Conduct.

The list of contributors is available on GitHub.

License

Licensed under the MIT license (see to the LICENSE file).
Haskell bindings: Copyright (c) 2015-2016 Greg V greg@unrelenting.technology
Duktape: Copyright (c) 2013-2016 by Duktape authors (see duktape/AUTHORS.rst)