git.iko.soy/rowtype-yoga/purescript-native
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rowtype-yoga/purescript-native/src/Language/PureScript.hs
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1-----------------------------------------------------------------------------
2--
3-- Module : Language.PureScript
4-- Copyright : (c) Phil Freeman 2013
5-- License : MIT
6--
7-- Maintainer : Phil Freeman <paf31@cantab.net>
8-- Stability : experimental
9-- Portability :
10--
11-- |
12-- The main compiler module
13--
14-----------------------------------------------------------------------------
16module Language.PureScript (module P, compile) where
18import Language.PureScript.Values as P
19import Language.PureScript.Types as P
20import Language.PureScript.Kinds as P
21import Language.PureScript.Declarations as P
22import Language.PureScript.Names as P
23import Language.PureScript.Parser as P
24import Language.PureScript.CodeGen as P
25import Language.PureScript.CodeGen.Common as P
26import Language.PureScript.TypeChecker as P
27import Language.PureScript.Pretty as P
28import Language.PureScript.Sugar as P
29import Language.PureScript.Options as P
30import Language.PureScript.ModuleDependencies as P
31import Language.PureScript.DeadCodeElimination as P
33import Data.List (intercalate)
34import Data.Maybe (mapMaybe)
35import Control.Monad.State.Lazy
36import Control.Applicative ((<$>), (<*>), pure)
37import qualified Data.Map as M
39-- |
40-- Compile a collection of modules
41--
42-- The compilation pipeline proceeds as follows:
43--
44-- * Sort the modules based on module dependencies, checking for cyclic dependencies.
45--
46-- * Perform a set of desugaring passes.
47--
48-- * Type check, and elaborate values to include type annotations and type class dictionaries.
49--
50-- * Regroup values to take into account new value dependencies introduced by elaboration.
51--
52-- * Eliminate dead code.
53--
54-- * Generate Javascript, and perform optimization passes.
55--
56-- * Pretty-print the generated Javascript
57--
58compile :: Options -> [Module] -> Either String (String, String, Environment)
59compile opts ms = do
60 sorted <- sortModules ms
61 desugared <- desugar sorted
62 (elaborated, env) <- runCheck $ forM desugared $ \(Module moduleName' decls exps) -> do
63 modify (\s -> s { checkCurrentModule = Just moduleName' })
64 Module moduleName' <$> typeCheckAll mainModuleIdent moduleName' decls <*> pure exps
65 regrouped <- createBindingGroupsModule . collapseBindingGroupsModule $ elaborated
66 let entryPoints = moduleNameFromString `map` optionsModules opts
67 let elim = if null entryPoints then regrouped else eliminateDeadCode env entryPoints regrouped
68 let js = mapMaybe (flip (moduleToJs opts) env) elim
69 let exts = intercalate "\n" . map (`moduleToPs` env) $ elim
70 js' <- case mainModuleIdent of
71 Just mmi -> do
72 when ((mmi, Ident "main") `M.notMember` names env) $
73 Left $ show mmi ++ ".main is undefined"
74 return $ js ++ [JSApp (JSAccessor "main" (JSAccessor (moduleNameToJs mmi) (JSVar "_ps"))) []]
75 _ -> return js
76 return (prettyPrintJS [wrapExportsContainer opts js'], exts, env)
77 where
78 mainModuleIdent = moduleNameFromString <$> optionsMain opts