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Binary.hs
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Binary.hs
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{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE OverloadedStrings #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
{-| This module contains logic for converting Dhall expressions to and from
CBOR expressions which can in turn be converted to and from a binary
representation
-}
module Dhall.Binary
( -- * Standard versions
StandardVersion(..)
, renderStandardVersion
-- * Encoding and decoding
, encodeExpression
, decodeExpression
-- * Exceptions
, DecodingFailure(..)
) where
import Codec.CBOR.Decoding (Decoder, TokenType(..))
import Codec.CBOR.Encoding (Encoding)
import Codec.Serialise (Serialise(encode, decode))
import Control.Applicative (empty, (<|>))
import Control.Exception (Exception)
import Data.ByteString.Lazy (ByteString)
import Dhall.Syntax
( Binding(..)
, Chunks(..)
, Const(..)
, Directory(..)
, DhallDouble(..)
, Expr(..)
, File(..)
, FilePrefix(..)
, Import(..)
, ImportHashed(..)
, ImportMode(..)
, ImportType(..)
, MultiLet(..)
, PreferAnnotation(..)
, Scheme(..)
, URL(..)
, Var(..)
)
import Data.Foldable (toList, foldl')
import Data.Monoid ((<>))
import Data.Text (Text)
import Data.Void (Void, absurd)
import GHC.Float (double2Float, float2Double)
import Numeric.Half (fromHalf, toHalf)
import qualified Codec.CBOR.Decoding as Decoding
import qualified Codec.CBOR.Encoding as Encoding
import qualified Codec.CBOR.Read as Read
import qualified Codec.Serialise as Serialise
import qualified Control.Monad as Monad
import qualified Data.ByteArray
import qualified Data.ByteString
import qualified Data.ByteString.Lazy
import qualified Data.Sequence
import qualified Data.Text as Text
import qualified Dhall.Crypto
import qualified Dhall.Map
import qualified Dhall.Set
import qualified Dhall.Syntax as Syntax
import qualified Text.Printf as Printf
{-| Supported version strings
This exists primarily for backwards compatibility for expressions encoded
before Dhall removed version tags from the binary encoding
-}
data StandardVersion
= NoVersion
-- ^ No version string
| V_5_0_0
-- ^ Version "5.0.0"
| V_4_0_0
-- ^ Version "4.0.0"
| V_3_0_0
-- ^ Version "3.0.0"
| V_2_0_0
-- ^ Version "2.0.0"
| V_1_0_0
-- ^ Version "1.0.0"
deriving (Enum, Bounded)
-- | Render a `StandardVersion` as `Text`
renderStandardVersion :: StandardVersion -> Text
renderStandardVersion NoVersion = "none"
renderStandardVersion V_1_0_0 = "1.0.0"
renderStandardVersion V_2_0_0 = "2.0.0"
renderStandardVersion V_3_0_0 = "3.0.0"
renderStandardVersion V_4_0_0 = "4.0.0"
renderStandardVersion V_5_0_0 = "5.0.0"
{-| Convert a function applied to multiple arguments to the base function and
the list of arguments
-}
unApply :: Expr s a -> (Expr s a, [Expr s a])
unApply e₀ = (baseFunction₀, diffArguments₀ [])
where
~(baseFunction₀, diffArguments₀) = go e₀
go (App f a) = (baseFunction, diffArguments . (a :))
where
~(baseFunction, diffArguments) = go f
go (Note _ e) = go e
go baseFunction = (baseFunction, id)
decodeExpressionInternal :: (Int -> Decoder s a) -> Decoder s (Expr t a)
decodeExpressionInternal decodeEmbed = go
where
go = do
let die message = fail ("Dhall.Binary.decodeExpressionInternal: " <> message)
tokenType₀ <- Decoding.peekTokenType
case tokenType₀ of
TypeUInt -> do
!n <- Decoding.decodeWord
return (Var (V "_" (fromIntegral n)))
TypeUInt64 -> do
!n <- Decoding.decodeWord64
return (Var (V "_" (fromIntegral n)))
TypeFloat16 -> do
!n <- Decoding.decodeFloat
return (DoubleLit (DhallDouble (float2Double n)))
TypeFloat32 -> do
!n <- Decoding.decodeFloat
return (DoubleLit (DhallDouble (float2Double n)))
TypeFloat64 -> do
!n <- Decoding.decodeDouble
return (DoubleLit (DhallDouble n))
TypeBool -> do
!b <- Decoding.decodeBool
return (BoolLit b)
TypeString -> do
s <- Decoding.decodeString
case s of
"Natural/build" -> return NaturalBuild
"Natural/fold" -> return NaturalFold
"Natural/isZero" -> return NaturalIsZero
"Natural/even" -> return NaturalEven
"Natural/odd" -> return NaturalOdd
"Natural/toInteger" -> return NaturalToInteger
"Natural/show" -> return NaturalShow
"Natural/subtract" -> return NaturalSubtract
"Integer/toDouble" -> return IntegerToDouble
"Integer/clamp" -> return IntegerClamp
"Integer/negate" -> return IntegerNegate
"Integer/show" -> return IntegerShow
"Double/show" -> return DoubleShow
"List/build" -> return ListBuild
"List/fold" -> return ListFold
"List/length" -> return ListLength
"List/head" -> return ListHead
"List/last" -> return ListLast
"List/indexed" -> return ListIndexed
"List/reverse" -> return ListReverse
"Optional/fold" -> return OptionalFold
"Optional/build" -> return OptionalBuild
"Bool" -> return Bool
"Optional" -> return Optional
"None" -> return None
"Natural" -> return Natural
"Integer" -> return Integer
"Double" -> return Double
"Text" -> return Text
"Text/show" -> return TextShow
"List" -> return List
"Type" -> return (Const Type)
"Kind" -> return (Const Kind)
"Sort" -> return (Const Sort)
_ -> die ("Unrecognized built-in: " <> Text.unpack s)
TypeListLen -> do
len <- Decoding.decodeListLen
case len of
0 -> die "Missing tag"
_ -> return ()
tokenType₁ <- Decoding.peekTokenType
case tokenType₁ of
TypeString -> do
x <- Decoding.decodeString
if x == "_"
then die "Non-standard encoding of an α-normalized variable"
else return ()
tokenType₂ <- Decoding.peekTokenType
case tokenType₂ of
TypeUInt -> do
!n <- Decoding.decodeWord
return (Var (V x (fromIntegral n)))
TypeUInt64 -> do
!n <- Decoding.decodeWord64
return (Var (V x (fromIntegral n)))
_ -> do
die ("Unexpected token type for variable index: " <> show tokenType₂)
TypeUInt -> do
tag <- Decoding.decodeWord
case tag of
0 -> do
f <- go
xs <- Monad.replicateM (len - 2) go
if null xs
then die "Non-standard encoding of a function with no arguments"
else return ()
return (foldl' App f xs)
1 -> do
case len of
3 -> do
_A <- go
b <- go
return (Lam "_" _A b)
4 -> do
x <- Decoding.decodeString
if x == "_"
then die "Non-standard encoding of a λ expression"
else return ()
_A <- go
b <- go
return (Lam x _A b)
_ -> do
die ("Incorrect number of tokens used to encode a λ expression: " <> show len)
2 -> do
case len of
3 -> do
_A <- go
_B <- go
return (Pi "_" _A _B)
4 -> do
x <- Decoding.decodeString
if x == "_"
then die "Non-standard encoding of a ∀ expression"
else return ()
_A <- go
_B <- go
return (Pi x _A _B)
_ -> do
die ("Incorrect number of tokens used to encode a ∀ expression: " <> show len)
3 -> do
opcode <- Decoding.decodeWord
op <- case opcode of
0 -> return BoolOr
1 -> return BoolAnd
2 -> return BoolEQ
3 -> return BoolNE
4 -> return NaturalPlus
5 -> return NaturalTimes
6 -> return TextAppend
7 -> return ListAppend
8 -> return (Combine Nothing)
9 -> return (Prefer PreferFromSource)
10 -> return CombineTypes
11 -> return ImportAlt
12 -> return Equivalent
13 -> return RecordCompletion
_ -> die ("Unrecognized operator code: " <> show opcode)
l <- go
r <- go
return (op l r)
4 -> do
case len of
2 -> do
_T <- go
return (ListLit (Just (App List _T)) empty)
_ -> do
Decoding.decodeNull
xs <- Monad.replicateM (len - 2) go
return (ListLit Nothing (Data.Sequence.fromList xs))
5 -> do
Decoding.decodeNull
t <- go
return (Some t)
6 -> do
t <- go
u <- go
case len of
3 -> do
return (Merge t u Nothing)
4 -> do
_T <- go
return (Merge t u (Just _T))
_ -> do
die ("Incorrect number of tokens used to encode a `merge` expression: " <> show len)
7 -> do
mapLength <- Decoding.decodeMapLen
xTs <- Monad.replicateM mapLength $ do
x <- Decoding.decodeString
_T <- go
return (x, _T)
return (Record (Dhall.Map.fromList xTs))
8 -> do
mapLength <- Decoding.decodeMapLen
xts <- Monad.replicateM mapLength $ do
x <- Decoding.decodeString
t <- go
return (x, t)
return (RecordLit (Dhall.Map.fromList xts))
9 -> do
t <- go
x <- Decoding.decodeString
return (Field t x)
10 -> do
t <- go
xs <- case len of
3 -> do
tokenType₂ <- Decoding.peekTokenType
case tokenType₂ of
TypeListLen -> do
_ <- Decoding.decodeListLen
_T <- go
return (Right _T)
TypeString -> do
x <- Decoding.decodeString
return (Left (Dhall.Set.fromList [x]))
_ -> do
die ("Unexpected token type for projection: " <> show tokenType₂)
_ -> do
xs <- Monad.replicateM (len - 2) Decoding.decodeString
return (Left (Dhall.Set.fromList xs))
return (Project t xs)
11 -> do
mapLength <- Decoding.decodeMapLen
xTs <- Monad.replicateM mapLength $ do
x <- Decoding.decodeString
tokenType₂ <- Decoding.peekTokenType
mT <- case tokenType₂ of
TypeNull -> do
Decoding.decodeNull
return Nothing
_ -> do
_T <- go
return (Just _T)
return (x, mT)
return (Union (Dhall.Map.fromList xTs))
14 -> do
t <- go
l <- go
r <- go
return (BoolIf t l r)
15 -> do
tokenType₂ <- Decoding.peekTokenType
case tokenType₂ of
TypeUInt -> do
n <- Decoding.decodeWord
return (NaturalLit (fromIntegral n))
TypeUInt64 -> do
n <- Decoding.decodeWord64
return (NaturalLit (fromIntegral n))
TypeInteger -> do
n <- Decoding.decodeInteger
return (NaturalLit (fromIntegral n))
_ -> do
die ("Unexpected token type for Natural literal: " <> show tokenType₂)
16 -> do
tokenType₂ <- Decoding.peekTokenType
case tokenType₂ of
TypeUInt -> do
n <- Decoding.decodeWord
return (IntegerLit (fromIntegral n))
TypeUInt64 -> do
n <- Decoding.decodeWord64
return (IntegerLit (fromIntegral n))
TypeNInt -> do
n <- Decoding.decodeNegWord
return (IntegerLit (-1 - fromIntegral n))
TypeNInt64 -> do
n <- Decoding.decodeNegWord64
return (IntegerLit (-1 - fromIntegral n))
TypeInteger -> do
n <- Decoding.decodeInteger
return (IntegerLit n)
_ -> do
die ("Unexpected token type for Integer literal: " <> show tokenType₂)
18 -> do
xys <- Monad.replicateM ((len - 2) `quot` 2) $ do
x <- Decoding.decodeString
y <- go
return (x, y)
z <- Decoding.decodeString
return (TextLit (Chunks xys z))
19 -> do
t <- go
return (Assert t)
24 -> do
fmap Embed (decodeEmbed len)
25 -> do
bindings <- Monad.replicateM ((len - 2) `quot` 3) $ do
x <- Decoding.decodeString
tokenType₂ <- Decoding.peekTokenType
mA <- case tokenType₂ of
TypeNull -> do
Decoding.decodeNull
return Nothing
_ -> do
_A <- go
return (Just (Nothing, _A))
a <- go
return (Binding Nothing x Nothing mA Nothing a)
b <- go
return (foldr Let b bindings)
26 -> do
t <- go
_T <- go
return (Annot t _T)
27 -> do
t <- go
mT <- case len of
2 -> do
return Nothing
3 -> do
_T <- go
return (Just _T)
_ -> do
die ("Incorrect number of tokens used to encode a type annotation: " <> show len)
return (ToMap t mT)
28 -> do
_T <- go
return (ListLit (Just _T) empty)
_ -> do
die ("Unexpected tag: " <> show tag)
_ -> do
die ("Unexpected tag type: " <> show tokenType₁)
_ -> do
die ("Unexpected initial token: " <> show tokenType₀)
encodeExpressionInternal :: (a -> Encoding) -> Expr Void a -> Encoding
encodeExpressionInternal encodeEmbed = go
where
go e = case e of
Var (V "_" n) ->
Encoding.encodeInt n
Var (V x n) ->
Encoding.encodeListLen 2
<> Encoding.encodeString x
<> Encoding.encodeInt n
NaturalBuild ->
Encoding.encodeString "Natural/build"
NaturalFold ->
Encoding.encodeString "Natural/fold"
NaturalIsZero ->
Encoding.encodeString "Natural/isZero"
NaturalEven ->
Encoding.encodeString "Natural/even"
NaturalOdd ->
Encoding.encodeString "Natural/odd"
NaturalToInteger ->
Encoding.encodeString "Natural/toInteger"
NaturalShow ->
Encoding.encodeString "Natural/show"
NaturalSubtract ->
Encoding.encodeString "Natural/subtract"
IntegerToDouble ->
Encoding.encodeString "Integer/toDouble"
IntegerClamp ->
Encoding.encodeString "Integer/clamp"
IntegerNegate ->
Encoding.encodeString "Integer/negate"
IntegerShow ->
Encoding.encodeString "Integer/show"
DoubleShow ->
Encoding.encodeString "Double/show"
ListBuild ->
Encoding.encodeString "List/build"
ListFold ->
Encoding.encodeString "List/fold"
ListLength ->
Encoding.encodeString "List/length"
ListHead ->
Encoding.encodeString "List/head"
ListLast ->
Encoding.encodeString "List/last"
ListIndexed ->
Encoding.encodeString "List/indexed"
ListReverse ->
Encoding.encodeString "List/reverse"
OptionalFold ->
Encoding.encodeString "Optional/fold"
OptionalBuild ->
Encoding.encodeString "Optional/build"
Bool ->
Encoding.encodeString "Bool"
Optional ->
Encoding.encodeString "Optional"
None ->
Encoding.encodeString "None"
Natural ->
Encoding.encodeString "Natural"
Integer ->
Encoding.encodeString "Integer"
Double ->
Encoding.encodeString "Double"
Text ->
Encoding.encodeString "Text"
TextShow ->
Encoding.encodeString "Text/show"
List ->
Encoding.encodeString "List"
Const Type ->
Encoding.encodeString "Type"
Const Kind ->
Encoding.encodeString "Kind"
Const Sort ->
Encoding.encodeString "Sort"
a@App{} ->
encodeListN
(2 + length arguments)
( Encoding.encodeInt 0
: go function
: map go arguments
)
where
(function, arguments) = unApply a
Lam "_" _A b ->
encodeList3
(Encoding.encodeInt 1)
(go _A)
(go b)
Lam x _A b ->
encodeList4
(Encoding.encodeInt 1)
(Encoding.encodeString x)
(go _A)
(go b)
Pi "_" _A _B ->
encodeList3
(Encoding.encodeInt 2)
(go _A)
(go _B)
Pi x _A _B ->
encodeList4
(Encoding.encodeInt 2)
(Encoding.encodeString x)
(go _A)
(go _B)
BoolOr l r ->
encodeOperator 0 l r
BoolAnd l r ->
encodeOperator 1 l r
BoolEQ l r ->
encodeOperator 2 l r
BoolNE l r ->
encodeOperator 3 l r
NaturalPlus l r ->
encodeOperator 4 l r
NaturalTimes l r ->
encodeOperator 5 l r
TextAppend l r ->
encodeOperator 6 l r
ListAppend l r ->
encodeOperator 7 l r
Combine _ l r ->
encodeOperator 8 l r
Prefer _ l r ->
encodeOperator 9 l r
CombineTypes l r ->
encodeOperator 10 l r
ImportAlt l r ->
encodeOperator 11 l r
Equivalent l r ->
encodeOperator 12 l r
RecordCompletion l r ->
encodeOperator 13 l r
ListLit _T₀ xs
| null xs ->
encodeList2 (Encoding.encodeInt label) _T₁
| otherwise ->
encodeListN
(2 + length xs)
( Encoding.encodeInt 4
: Encoding.encodeNull
: map go (Data.Foldable.toList xs)
)
where
(label, _T₁) = case _T₀ of
Nothing -> (4 , Encoding.encodeNull)
Just (App List t) -> (4 , go t )
Just t -> (28, go t )
Some t ->
encodeList3
(Encoding.encodeInt 5)
Encoding.encodeNull
(go t)
Merge t u Nothing ->
encodeList3
(Encoding.encodeInt 6)
(go t)
(go u)
Merge t u (Just _T) ->
encodeList4
(Encoding.encodeInt 6)
(go t)
(go u)
(go _T)
Record xTs ->
encodeList2
(Encoding.encodeInt 7)
(encodeMapWith go xTs)
RecordLit xts ->
encodeList2
(Encoding.encodeInt 8)
(encodeMapWith go xts)
Field t x ->
encodeList3
(Encoding.encodeInt 9)
(go t)
(Encoding.encodeString x)
Project t (Left xs) ->
encodeListN
(2 + Dhall.Set.size xs)
( Encoding.encodeInt 10
: go t
: map Encoding.encodeString (Dhall.Set.toList xs)
)
Project t (Right _T) ->
encodeList3
(Encoding.encodeInt 10)
(go t)
(encodeList1 (go _T))
Union xTs ->
encodeList2
(Encoding.encodeInt 11)
(encodeMapWith encodeValue xTs)
where
encodeValue Nothing = Encoding.encodeNull
encodeValue (Just _T) = go _T
BoolLit b ->
Encoding.encodeBool b
BoolIf t l r ->
encodeList4
(Encoding.encodeInt 14)
(go t)
(go l)
(go r)
NaturalLit n ->
encodeList2
(Encoding.encodeInt 15)
(Encoding.encodeInteger (fromIntegral n))
IntegerLit n ->
encodeList2
(Encoding.encodeInt 16)
(Encoding.encodeInteger (fromIntegral n))
DoubleLit (DhallDouble n64)
| useHalf -> Encoding.encodeFloat16 n32
| useFloat -> Encoding.encodeFloat n32
| otherwise -> Encoding.encodeDouble n64
where
n32 = double2Float n64
n16 = toHalf n32
useFloat = n64 == float2Double n32
useHalf = n64 == (float2Double $ fromHalf n16)
-- Fast path for the common case of an uninterpolated string
TextLit (Chunks [] z) ->
encodeList2
(Encoding.encodeInt 18)
(Encoding.encodeString z)
TextLit (Chunks xys z) ->
encodeListN
(2 + 2 * length xys)
( Encoding.encodeInt 18
: concatMap encodePair xys ++ [ Encoding.encodeString z ]
)
where
encodePair (x, y) = [ Encoding.encodeString x, go y ]
Assert t ->
encodeList2
(Encoding.encodeInt 19)
(go t)
Embed x ->
encodeEmbed x
Let a₀ b₀ ->
encodeListN
(2 + 3 * length as)
( Encoding.encodeInt 25
: concatMap encodeBinding (toList as) ++ [ go b₁ ]
)
where
MultiLet as b₁ = Syntax.multiLet a₀ b₀
encodeBinding (Binding _ x _ mA₀ _ a) =
[ Encoding.encodeString x
, mA₁
, go a
]
where
mA₁ = case mA₀ of
Nothing -> Encoding.encodeNull
Just (_, _A) -> go _A
Annot t _T ->
encodeList3
(Encoding.encodeInt 26)
(go t)
(go _T)
ToMap t Nothing ->
encodeList2
(Encoding.encodeInt 27)
(go t)
ToMap t (Just _T) ->
encodeList3
(Encoding.encodeInt 27)
(go t)
(go _T)
a@With{} ->
go (Syntax.desugarWith a)
Note _ b ->
go b
encodeOperator n l r =
encodeList4
(Encoding.encodeInt 3)
(Encoding.encodeInt n)
(go l)
(go r)
encodeMapWith encodeValue m =
Encoding.encodeMapLen (fromIntegral (Dhall.Map.size m))
<> foldMap encodeKeyValue (Dhall.Map.toList (Dhall.Map.sort m))
where
encodeKeyValue (k, v) = Encoding.encodeString k <> encodeValue v
encodeList1 :: Encoding -> Encoding
encodeList1 a = Encoding.encodeListLen 1 <> a
{-# INLINE encodeList1 #-}
encodeList2 :: Encoding -> Encoding -> Encoding
encodeList2 a b = Encoding.encodeListLen 2 <> a <> b
{-# INLINE encodeList2 #-}
encodeList3 :: Encoding -> Encoding -> Encoding -> Encoding
encodeList3 a b c = Encoding.encodeListLen 3 <> a <> b <> c
{-# INLINE encodeList3 #-}
encodeList4 :: Encoding -> Encoding -> Encoding -> Encoding -> Encoding
encodeList4 a b c d = Encoding.encodeListLen 4 <> a <> b <> c <> d
{-# INLINE encodeList4 #-}
encodeListN :: Int -> [ Encoding ] -> Encoding
encodeListN len xs = Encoding.encodeListLen (fromIntegral len) <> mconcat xs
{-# INLINE encodeListN #-}
encodeList :: [ Encoding ] -> Encoding
encodeList xs = encodeListN (length xs) xs
{-# INLINE encodeList #-}
decodeImport :: Int -> Decoder s Import
decodeImport len = do
let die message = fail ("Dhall.Binary.decodeImport: " <> message)
tokenType₀ <- Decoding.peekTokenType
hash <- case tokenType₀ of
TypeNull -> do
Decoding.decodeNull
return Nothing
TypeBytes -> do
bytes <- Decoding.decodeBytes