git.iko.soy/rowtype-yoga/purescript-native
on 4dc1c58 help sign in
rowtype-yoga/purescript-native/src/Language/PureScript/Names.hs
81 lines 2.1 kB history raw
1-----------------------------------------------------------------------------
2--
3-- Module : Language.PureScript.Names
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-- Data types for names
13--
14-----------------------------------------------------------------------------
16{-# LANGUAGE DeriveDataTypeable #-}
18module Language.PureScript.Names where
20import Data.List
21import Data.Data
23-- |
24-- Names for value identifiers
25--
26data Ident
27 -- |
28 -- An alphanumeric identifier
29 --
30 = Ident String
31 -- |
32 -- A symbolic name for an infix operator
33 --
34 | Op String deriving (Eq, Ord, Data, Typeable)
36instance Show Ident where
37 show (Ident s) = s
38 show (Op op) = '(':op ++ ")"
40-- |
41-- Proper names, i.e. capitalized names for e.g. module names, type//data constructors.
42--
43newtype ProperName = ProperName { runProperName :: String } deriving (Eq, Ord, Data, Typeable)
45instance Show ProperName where
46 show = runProperName
48-- |
49-- Module names
50--
51data ModuleName = ModuleName [ProperName] deriving (Eq, Ord, Data, Typeable)
53runModuleName :: ModuleName -> String
54runModuleName (ModuleName pns) = intercalate "." (runProperName `map` pns)
56moduleNameFromString :: String -> ModuleName
57moduleNameFromString = ModuleName . splitProperNames
58 where
59 splitProperNames s = case dropWhile (== '.') s of
60 "" -> []
61 s' -> ProperName w : splitProperNames s''
62 where (w, s'') = break (== '.') s'
64instance Show ModuleName where
65 show = runModuleName
67-- |
68-- A qualified name, i.e. a name with an optional module name
69--
70data Qualified a = Qualified (Maybe ModuleName) a deriving (Eq, Ord, Data, Typeable)
72instance (Show a) => Show (Qualified a) where
73 show (Qualified Nothing a) = show a
74 show (Qualified (Just name) a) = show name ++ "." ++ show a
76-- |
77-- Provide a default module name, if a name is unqualified
78--
79qualify :: ModuleName -> Qualified a -> (ModuleName, a)
80qualify m (Qualified Nothing a) = (m, a)
81qualify _ (Qualified (Just m) a) = (m, a)