c8d5a4ff40
The compiler itself is under the GPLv2+; the support code that gets built into user programs is under the LGPLv2+. This matches the existing practice for the KRoC project. (As with Occade, I've used the new GPLv3-style license header in the source files, though, since that avoids having to update the FSF's postal address.)
80 lines
2.6 KiB
Haskell
80 lines
2.6 KiB
Haskell
{-
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Tock: a compiler for parallel languages
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Copyright (C) 2007 University of Kent
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 2 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>.
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-}
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-- | A generic show implementation that pretty-prints expressions.
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-- This ought to use a class (like show does), so that it can be extended
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-- properly without me needing to have Tock-specific cases in here -- see the
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-- appropriate SYB paper.
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module PrettyShow (pshow, isTupleCtr) where
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import Data.Generics
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import qualified Data.Map as Map
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import Text.PrettyPrint.HughesPJ
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import qualified AST as A
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import Metadata
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-- This is ugly -- but it looks like you can't easily define a generic function
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-- even for a single tuple type, since it has to parameterise over multiple Data
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-- types...
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isTupleCtr :: String -> Bool
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isTupleCtr ('(':cs) = checkRest cs
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where
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checkRest ",)" = True
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checkRest (',':cs) = checkRest cs
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checkRest _ = False
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isTupleCtr _ = False
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doGeneral :: Data a => a -> Doc
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doGeneral t =
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if isTupleCtr cn then
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parens $ sep $ punctuate (text ",") l
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else case l of
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[] -> con
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otherwise -> parens $ sep (con : l)
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where
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cn = showConstr (toConstr t)
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con = text $ cn
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l = gmapQ doAny t
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doList :: Data a => [a] -> Doc
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doList t = brackets $ sep $ punctuate (text ",") (map doAny t)
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doString :: String -> Doc
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doString s = text $ show s
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doMeta :: Meta -> Doc
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doMeta m = text $ show m
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doMap :: (Data a, Data b) => Map.Map a b -> Doc
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doMap map = braces $ sep $ punctuate (text ",") [doAny k <+> text ":" <+> doAny v
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| (k, v) <- Map.toAscList map]
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doAny :: Data a => a -> Doc
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doAny = doGeneral `ext1Q` doList `extQ` doString `extQ` doMeta
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`extQ` (doMap :: Map.Map String String -> Doc)
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`extQ` (doMap :: Map.Map String A.NameDef -> Doc)
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`extQ` (doMap :: Map.Map String [A.Type] -> Doc)
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`extQ` (doMap :: Map.Map String [A.Actual] -> Doc)
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-- | Convert an arbitrary data structure to a string in a reasonably pretty way.
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-- This is currently rather slow.
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pshow :: Data a => a -> String
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pshow x = render $ doAny x
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