60 lines
2.2 KiB
Haskell
60 lines
2.2 KiB
Haskell
{-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-}
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{- | This module exports the functions necessary for compiling Elm code into the
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respective HTML, CSS, and JS code.
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The documentation for the Elm language is available at
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<http://elm-lang.org/Documentation.elm>, and many interactive examples are
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available at <http://elm-lang.org/Examples.elm>
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Example implementations using Yesod and Happstack are available
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at <https://github.com/tazjin/Elm/tree/master/Examples>
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-}
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module Language.Elm (compile, toHtml, moduleName, runtime, docs) where
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import qualified Data.List as List
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import qualified Data.Map as Map
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import Data.Version (showVersion)
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import Generate.JavaScript (showErr, jsModule)
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import Generate.Html (generateHtml)
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import Initialize (buildFromSource)
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import Parse.Helpers
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import Parse.Module (moduleDef)
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import SourceSyntax.Module
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import Text.Blaze.Html (Html)
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import Text.Parsec (option,optional)
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import qualified Text.PrettyPrint as P
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import Paths_Elm
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-- |This function compiles Elm code to JavaScript. It will return either
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-- an error message or the compiled JS code.
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compile :: String -> Either String String
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compile source =
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case buildFromSource Map.empty source of
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Left docs -> Left . unlines $ map P.render docs
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Right modul -> Right $ jsModule (modul :: MetadataModule () ())
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-- |This function extracts the module name of a given source program.
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moduleName :: String -> Maybe String
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moduleName source = case iParse getModuleName "" source of
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Right name -> Just name
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Left _ -> Nothing
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where
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getModuleName = do
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optional freshLine
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(names, _) <- moduleDef
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return (List.intercalate "." names)
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-- |This function compiles Elm code into a full HTML page.
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toHtml :: String -- ^ Location of elm-min.js as expected by the browser
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-> String -- ^ The page title
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-> String -- ^ The elm source code
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-> Html
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toHtml = generateHtml
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-- |The absolute path to Elm's runtime system.
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runtime :: IO FilePath
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runtime = getDataFileName "elm-runtime.js"
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-- |The absolute path to Elm's core library documentation.
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docs :: IO FilePath
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docs = getDataFileName "docs.json"
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