{-# LANGUAGE CPP #-}
{-# LANGUAGE MagicHash #-}
{-# OPTIONS_GHC -Wunused-imports #-}
{-# OPTIONS_GHC -Wunused-matches #-}
{-# OPTIONS_GHC -Wunused-binds #-}

------------------------------------------------------------------------
-- | The parser monad used by the operator parser
------------------------------------------------------------------------

{-# LANGUAGE CPP #-}

module Agda.Syntax.Concrete.Operators.Parser.Monad
  ( MemoKey(..), PrecedenceKey
  , Parser
  , parse
  , sat'
  , sat
  , doc
  , memoise
  , memoiseIfPrinting
  , grammar
  , pattern LeftPK
  , pattern RightPK
  ) where

import Data.Hashable
import GHC.Generics (Generic)
#if ! (__GLASGOW_HASKELL__ <= 908)
import GHC.Exts
#endif
import GHC.Word (Word64(..))

import Agda.Syntax.Common
import Agda.Syntax.Common.Pretty

import qualified Agda.Utils.Parser.MemoisedCPS as Parser
import Agda.Utils.Hash

-- | Memoisation keys.

data MemoKey = NodeK      {-# UNPACK #-} !PrecedenceKey
             | PostLeftsK {-# UNPACK #-} !PrecedenceKey
             | PreRightsK {-# UNPACK #-} !PrecedenceKey
             | TopK
             | AppK
             | NonfixK
  deriving (MemoKey -> MemoKey -> Bool
(MemoKey -> MemoKey -> Bool)
-> (MemoKey -> MemoKey -> Bool) -> Eq MemoKey
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
$c== :: MemoKey -> MemoKey -> Bool
== :: MemoKey -> MemoKey -> Bool
$c/= :: MemoKey -> MemoKey -> Bool
/= :: MemoKey -> MemoKey -> Bool
Eq, Int -> MemoKey -> ShowS
[MemoKey] -> ShowS
MemoKey -> String
(Int -> MemoKey -> ShowS)
-> (MemoKey -> String) -> ([MemoKey] -> ShowS) -> Show MemoKey
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
$cshowsPrec :: Int -> MemoKey -> ShowS
showsPrec :: Int -> MemoKey -> ShowS
$cshow :: MemoKey -> String
show :: MemoKey -> String
$cshowList :: [MemoKey] -> ShowS
showList :: [MemoKey] -> ShowS
Show, (forall x. MemoKey -> Rep MemoKey x)
-> (forall x. Rep MemoKey x -> MemoKey) -> Generic MemoKey
forall x. Rep MemoKey x -> MemoKey
forall x. MemoKey -> Rep MemoKey x
forall a.
(forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a
$cfrom :: forall x. MemoKey -> Rep MemoKey x
from :: forall x. MemoKey -> Rep MemoKey x
$cto :: forall x. Rep MemoKey x -> MemoKey
to :: forall x. Rep MemoKey x -> MemoKey
Generic)

data PrecedenceKey = PrecKey !Bool !PrecedenceLevel
  deriving (PrecedenceKey -> PrecedenceKey -> Bool
(PrecedenceKey -> PrecedenceKey -> Bool)
-> (PrecedenceKey -> PrecedenceKey -> Bool) -> Eq PrecedenceKey
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
$c== :: PrecedenceKey -> PrecedenceKey -> Bool
== :: PrecedenceKey -> PrecedenceKey -> Bool
$c/= :: PrecedenceKey -> PrecedenceKey -> Bool
/= :: PrecedenceKey -> PrecedenceKey -> Bool
Eq, Int -> PrecedenceKey -> ShowS
[PrecedenceKey] -> ShowS
PrecedenceKey -> String
(Int -> PrecedenceKey -> ShowS)
-> (PrecedenceKey -> String)
-> ([PrecedenceKey] -> ShowS)
-> Show PrecedenceKey
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
$cshowsPrec :: Int -> PrecedenceKey -> ShowS
showsPrec :: Int -> PrecedenceKey -> ShowS
$cshow :: PrecedenceKey -> String
show :: PrecedenceKey -> String
$cshowList :: [PrecedenceKey] -> ShowS
showList :: [PrecedenceKey] -> ShowS
Show)

pattern RightPK :: PrecedenceLevel -> PrecedenceKey
pattern $mRightPK :: forall {r}.
PrecedenceKey -> (PrecedenceLevel -> r) -> ((# #) -> r) -> r
$bRightPK :: PrecedenceLevel -> PrecedenceKey
RightPK l = PrecKey False l

pattern LeftPK :: PrecedenceLevel -> PrecedenceKey
pattern $mLeftPK :: forall {r}.
PrecedenceKey -> (PrecedenceLevel -> r) -> ((# #) -> r) -> r
$bLeftPK :: PrecedenceLevel -> PrecedenceKey
LeftPK l = PrecKey True l

#if __GLASGOW_HASKELL__ <= 908
doubleToWord64 :: Double -> Word64
doubleToWord64 x = fromIntegral $ hash x
#else
doubleToWord64 :: Double -> Word64
doubleToWord64 :: PrecedenceLevel -> Word64
doubleToWord64 (D# Double#
x) = Word64# -> Word64
W64# (Double# -> Word64#
castDoubleToWord64# Double#
x)
#endif

instance Hashable PrecedenceKey where
  hashWithSalt :: Int -> PrecedenceKey -> Int
hashWithSalt Int
h (PrecKey Bool
b PrecedenceLevel
l) = Word -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Word -> Int) -> Word -> Int
forall a b. (a -> b) -> a -> b
$
    Int -> Word
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Int
h Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Bool -> Int
forall a. Enum a => a -> Int
fromEnum Bool
b) Word -> Word -> Word
`combineWord` Word64 -> Word
forall a b. (Integral a, Num b) => a -> b
fromIntegral (PrecedenceLevel -> Word64
doubleToWord64 PrecedenceLevel
l)

instance Hashable MemoKey where
  hashWithSalt :: Int -> MemoKey -> Int
hashWithSalt Int
h = \case
    NodeK PrecedenceKey
pk      -> Int -> PrecedenceKey -> Int
forall a. Hashable a => Int -> a -> Int
hashWithSalt (Int
h Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1) PrecedenceKey
pk
    PostLeftsK PrecedenceKey
pk -> Int -> PrecedenceKey -> Int
forall a. Hashable a => Int -> a -> Int
hashWithSalt (Int
h Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
2) PrecedenceKey
pk
    PreRightsK PrecedenceKey
pk -> Int -> PrecedenceKey -> Int
forall a. Hashable a => Int -> a -> Int
hashWithSalt (Int
h Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
3) PrecedenceKey
pk
    MemoKey
TopK          -> Int -> Int -> Int
combineInt Int
h Int
4
    MemoKey
AppK          -> Int -> Int -> Int
combineInt Int
h Int
5
    MemoKey
NonfixK       -> Int -> Int -> Int
combineInt Int
h Int
6

-- | The parser monad.
type Parser tok a =
#ifdef DEBUG_PARSING
  Parser.ParserWithGrammar
#else
  Parser.Parser
#endif
    MemoKey tok (MaybePlaceholder tok) a

-- | Runs the parser.

parse :: forall tok a. Parser tok a -> [MaybePlaceholder tok] -> [a]
parse :: forall tok a. Parser tok a -> [MaybePlaceholder tok] -> [a]
parse = Parser MemoKey tok (MaybePlaceholder tok) a
-> [MaybePlaceholder tok] -> [a]
forall a.
Parser MemoKey tok (MaybePlaceholder tok) a
-> [MaybePlaceholder tok] -> [a]
forall (p :: * -> *) k r tok a.
ParserClass p k r tok =>
p a -> [tok] -> [a]
Parser.parse

-- | Parses a token satisfying the given predicate. The computed value
-- is returned.

sat' :: (MaybePlaceholder tok -> Maybe a) -> Parser tok a
sat' :: forall tok a. (MaybePlaceholder tok -> Maybe a) -> Parser tok a
sat' = (MaybePlaceholder tok -> Maybe a)
-> Parser MemoKey tok (MaybePlaceholder tok) a
forall a.
(MaybePlaceholder tok -> Maybe a)
-> Parser MemoKey tok (MaybePlaceholder tok) a
forall (p :: * -> *) k r tok a.
ParserClass p k r tok =>
(tok -> Maybe a) -> p a
Parser.sat'

-- | Parses a token satisfying the given predicate.

sat :: (MaybePlaceholder tok -> Bool) ->
       Parser tok (MaybePlaceholder tok)
sat :: forall tok.
(MaybePlaceholder tok -> Bool) -> Parser tok (MaybePlaceholder tok)
sat = (MaybePlaceholder tok -> Bool)
-> Parser MemoKey tok (MaybePlaceholder tok) (MaybePlaceholder tok)
forall (p :: * -> *) k r tok.
ParserClass p k r tok =>
(tok -> Bool) -> p tok
Parser.sat

-- | Uses the given document as the printed representation of the
-- given parser. The document's precedence is taken to be 'atomP'.

doc :: Doc -> Parser tok a -> Parser tok a
doc :: forall tok a. Doc -> Parser tok a -> Parser tok a
doc = Doc
-> Parser MemoKey tok (MaybePlaceholder tok) a
-> Parser MemoKey tok (MaybePlaceholder tok) a
forall (p :: * -> *) k r tok a.
ParserClass p k r tok =>
Doc -> p a -> p a
Parser.doc

-- | Memoises the given parser.
--
-- Every memoised parser must be annotated with a /unique/ key.
-- (Parametrised parsers must use distinct keys for distinct inputs.)

memoise :: MemoKey -> Parser tok tok -> Parser tok tok
memoise :: forall tok. MemoKey -> Parser tok tok -> Parser tok tok
memoise = MemoKey
-> Parser MemoKey tok (MaybePlaceholder tok) tok
-> Parser MemoKey tok (MaybePlaceholder tok) tok
forall (p :: * -> *) k r tok.
(ParserClass p k r tok, Hashable k, Show k) =>
k -> p r -> p r
Parser.memoise

-- | Memoises the given parser, but only if printing, not if parsing.
--
-- Every memoised parser must be annotated with a /unique/ key.
-- (Parametrised parsers must use distinct keys for distinct inputs.)

memoiseIfPrinting :: MemoKey -> Parser tok tok -> Parser tok tok
memoiseIfPrinting :: forall tok. MemoKey -> Parser tok tok -> Parser tok tok
memoiseIfPrinting = MemoKey
-> Parser MemoKey tok (MaybePlaceholder tok) tok
-> Parser MemoKey tok (MaybePlaceholder tok) tok
forall (p :: * -> *) k r tok.
(ParserClass p k r tok, Hashable k, Show k) =>
k -> p r -> p r
Parser.memoiseIfPrinting

-- | Tries to print the parser, or returns 'empty', depending on the
-- implementation. This function might not terminate.

grammar :: Parser tok a -> Doc
grammar :: forall tok a. Parser tok a -> Doc
grammar = Parser MemoKey tok (MaybePlaceholder tok) a -> Doc
forall a.
Show MemoKey =>
Parser MemoKey tok (MaybePlaceholder tok) a -> Doc
forall (p :: * -> *) k r tok a.
(ParserClass p k r tok, Show k) =>
p a -> Doc
Parser.grammar