git.iko.soy/rowtype-yoga/purescript-native
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rowtype-yoga/purescript-native/src/Language/PureScript/Sugar.hs
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1-----------------------------------------------------------------------------
2--
3-- Module : Language.PureScript.Sugar
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-- Desugaring passes
13--
14-----------------------------------------------------------------------------
16{-# LANGUAGE FlexibleContexts #-}
18module Language.PureScript.Sugar (desugar, module S) where
20import Control.Monad
21import Control.Category ((>>>))
22import Control.Applicative
23import Control.Monad.Error.Class (MonadError())
24import Control.Monad.Writer.Class (MonadWriter())
25import Control.Monad.Supply.Class
27import Language.PureScript.AST
28import Language.PureScript.Errors
30import Language.PureScript.Sugar.BindingGroups as S
31import Language.PureScript.Sugar.CaseDeclarations as S
32import Language.PureScript.Sugar.DoNotation as S
33import Language.PureScript.Sugar.Names as S
34import Language.PureScript.Sugar.ObjectWildcards as S
35import Language.PureScript.Sugar.Operators as S
36import Language.PureScript.Sugar.TypeClasses as S
37import Language.PureScript.Sugar.TypeClasses.Deriving as S
38import Language.PureScript.Sugar.TypeDeclarations as S
40-- |
41-- The desugaring pipeline proceeds as follows:
42--
43-- * Remove signed literals in favour of `negate` applications
44--
45-- * Desugar object literals with wildcards into lambdas
46--
47-- * Desugar operator sections
48--
49-- * Desugar do-notation using the @Prelude.Monad@ type class
50--
51-- * Desugar top-level case declarations into explicit case expressions
52--
53-- * Desugar type declarations into value declarations with explicit type annotations
54--
55-- * Qualify any unqualified names and types
56--
57-- * Rebracket user-defined binary operators
58--
59-- * Introduce type synonyms for type class dictionaries
60--
61-- * Group mutually recursive value and data declarations into binding groups.
62--
63desugar :: (Applicative m, MonadSupply m, MonadError MultipleErrors m, MonadWriter MultipleErrors m) => [Module] -> m [Module]
64desugar = map removeSignedLiterals
65 >>> mapM desugarObjectConstructors
66 >=> mapM desugarOperatorSections
67 >=> mapM desugarDoModule
68 >=> desugarCasesModule
69 >=> desugarTypeDeclarationsModule
70 >=> desugarImports
71 >=> rebracket
72 >=> mapM deriveInstances
73 >=> desugarTypeClasses
74 >=> createBindingGroupsModule