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Binary.hs
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{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ViewPatterns #-}
{-# 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
( -- * Encoding and decoding
encodeExpression
, decodeExpression
-- * Exceptions
, DecodingFailure(..)
) where
import Codec.CBOR.Decoding (Decoder, TokenType (..))
import Codec.CBOR.Encoding (Encoding)
import Codec.Serialise (Serialise (decode, encode))
import Control.Applicative (empty, (<|>))
import Control.Exception (Exception)
import Data.ByteString.Lazy (ByteString)
import Dhall.Syntax
( Binding (..)
, Chunks (..)
, Const (..)
, DhallDouble (..)
, Directory (..)
, Expr (..)
, File (..)
, FilePrefix (..)
, FunctionBinding (..)
, Import (..)
, ImportHashed (..)
, ImportMode (..)
, ImportType (..)
, MultiLet (..)
, PreferAnnotation (..)
, RecordField (..)
, Scheme (..)
, URL (..)
, Var (..)
, WithComponent (..)
)
import Data.Foldable (toList)
import Data.Ratio ((%))
import Data.Void (Void, absurd)
import GHC.Float (double2Float, float2Double)
import Numeric.Half (fromHalf, toHalf)
import Prelude hiding (exponent)
import qualified Codec.CBOR.ByteArray
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 Data.ByteString
import qualified Data.ByteString.Lazy
import qualified Data.ByteString.Short
import qualified Data.Foldable as Foldable
import qualified Data.List.NonEmpty as NonEmpty
import qualified Data.Sequence
import qualified Data.Time as Time
import qualified Dhall.Crypto
import qualified Dhall.Map
import qualified Dhall.Syntax as Syntax
import qualified Text.Printf as Printf
{-| 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 <- fromIntegral <$> Decoding.decodeWord
return (Var (V "_" n))
TypeUInt64 -> do
!n <- fromIntegral <$> Decoding.decodeWord64
return (Var (V "_" n))
TypeFloat16 -> do
!n <- float2Double <$> Decoding.decodeFloat
return (DoubleLit (DhallDouble n))
TypeFloat32 -> do
!n <- float2Double <$> Decoding.decodeFloat
return (DoubleLit (DhallDouble n))
TypeFloat64 -> do
!n <- Decoding.decodeDouble
return (DoubleLit (DhallDouble n))
TypeBool -> do
!b <- Decoding.decodeBool
return (BoolLit b)
TypeString -> do
!ba <- Decoding.decodeUtf8ByteArray
let sb = Codec.CBOR.ByteArray.toShortByteString ba
case Data.ByteString.Short.length sb of
4 | sb == "Bool" -> return Bool
| sb == "Date" -> return Date
| sb == "List" -> return List
| sb == "None" -> return None
| sb == "Text" -> return Text
| sb == "Time" -> return Time
| sb == "Type" -> return (Const Type)
| sb == "Kind" -> return (Const Kind)
| sb == "Sort" -> return (Const Sort)
6 | sb == "Double" -> return Double
7 | sb == "Integer" -> return Integer
| sb == "Natural" -> return Natural
8 | sb == "Optional" -> return Optional
| sb == "TimeZone" -> return TimeZone
9 | sb == "List/drop" -> return ListDrop
| sb == "List/fold" -> return ListFold
| sb == "List/head" -> return ListHead
| sb == "List/last" -> return ListLast
| sb == "Text/show" -> return TextShow
| sb == "List/take" -> return ListTake
10 | sb == "List/build" -> return ListBuild
11 | sb == "Double/show" -> return DoubleShow
| sb == "List/length" -> return ListLength
| sb == "Natural/odd" -> return NaturalOdd
12 | sb == "Integer/show" -> return IntegerShow
| sb == "List/indexed" -> return ListIndexed
| sb == "List/reverse" -> return ListReverse
| sb == "Natural/even" -> return NaturalEven
| sb == "Natural/fold" -> return NaturalFold
| sb == "Natural/show" -> return NaturalShow
| sb == "Text/replace" -> return TextReplace
13 | sb == "Integer/clamp" -> return IntegerClamp
| sb == "Natural/build" -> return NaturalBuild
14 | sb == "Integer/negate" -> return IntegerNegate
| sb == "Natural/isZero" -> return NaturalIsZero
16 | sb == "Integer/toDouble" -> return IntegerToDouble
| sb == "Natural/subtract" -> return NaturalSubtract
17 | sb == "Natural/toInteger" -> return NaturalToInteger
_ -> die ("Unrecognized built-in: " <> show sb)
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 <- fromIntegral <$> Decoding.decodeWord
return (Var (V x n))
TypeUInt64 -> do
!n <- fromIntegral <$> Decoding.decodeWord64
return (Var (V x n))
_ ->
die ("Unexpected token type for variable index: " <> show tokenType₂)
TypeUInt -> do
tag <- Decoding.decodeWord
case tag of
0 -> do
!f <- go
let loop n !acc
| n <= 0 = return acc
| otherwise = do
!x <- go
loop (n - 1) (App acc x)
let nArgs = len - 2
if nArgs <= 0
then die "Non-standard encoding of a function with no arguments"
else loop nArgs f
1 ->
case len of
3 -> do
_A <- go
b <- go
return (Lam mempty (Syntax.makeFunctionBinding "_" _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 mempty (Syntax.makeFunctionBinding x _A) b)
_ ->
die ("Incorrect number of tokens used to encode a λ expression: " <> show len)
2 ->
case len of
3 -> do
_A <- go
_B <- go
return (Pi mempty "_" _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 mempty x _A _B)
_ ->
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 mempty Nothing)
9 -> return (Prefer mempty PreferFromSource)
10 -> return (CombineTypes mempty)
11 -> return ImportAlt
12 -> return (Equivalent mempty)
13 -> return RecordCompletion
_ -> die ("Unrecognized operator code: " <> show opcode)
l <- go
r <- go
return (op l r)
4 ->
case len of
2 -> do
_T <- go
return (ListLit (Just (App List _T)) empty)
_ -> do
Decoding.decodeNull
xs <- Data.Sequence.replicateA (len - 2) go
return (ListLit Nothing xs)
5 -> do
Decoding.decodeNull
t <- go
return (Some t)
6 -> do
t <- go
u <- go
case len of
3 ->
return (Merge t u Nothing)
4 -> do
_T <- go
return (Merge t u (Just _T))
_ ->
die ("Incorrect number of tokens used to encode a `merge` expression: " <> show len)
7 -> do
mapLength <- Decoding.decodeMapLen
xTs <- replicateDecoder mapLength $ do
x <- Decoding.decodeString
_T <- go
return (x, Syntax.makeRecordField _T)
return (Record (Dhall.Map.fromList xTs))
8 -> do
mapLength <- Decoding.decodeMapLen
xts <- replicateDecoder mapLength $ do
x <- Decoding.decodeString
t <- go
return (x, Syntax.makeRecordField t)
return (RecordLit (Dhall.Map.fromList xts))
9 -> do
t <- go
x <- Decoding.decodeString
return (Field t (Syntax.makeFieldSelection 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 [x])
_ ->
die ("Unexpected token type for projection: " <> show tokenType₂)
_ -> do
xs <- replicateDecoder (len - 2) Decoding.decodeString
return (Left xs)
return (Project t xs)
11 -> do
mapLength <- Decoding.decodeMapLen
xTs <- replicateDecoder 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 <- fromIntegral <$> Decoding.decodeWord
return (NaturalLit n)
TypeUInt64 -> do
!n <- fromIntegral <$> Decoding.decodeWord64
return (NaturalLit n)
TypeInteger -> do
!n <- fromIntegral <$> Decoding.decodeInteger
return (NaturalLit n)
_ ->
die ("Unexpected token type for Natural literal: " <> show tokenType₂)
16 -> do
tokenType₂ <- Decoding.peekTokenType
case tokenType₂ of
TypeUInt -> do
!n <- fromIntegral <$> Decoding.decodeWord
return (IntegerLit n)
TypeUInt64 -> do
!n <- fromIntegral <$> Decoding.decodeWord64
return (IntegerLit n)
TypeNInt -> do
!n <- fromIntegral <$> Decoding.decodeNegWord
return (IntegerLit $! (-1 - n))
TypeNInt64 -> do
!n <- fromIntegral <$> Decoding.decodeNegWord64
return (IntegerLit $! (-1 - n))
TypeInteger -> do
n <- Decoding.decodeInteger
return (IntegerLit n)
_ ->
die ("Unexpected token type for Integer literal: " <> show tokenType₂)
18 -> do
xys <- replicateDecoder ((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 ->
fmap Embed (decodeEmbed len)
25 -> do
bindings <- replicateDecoder ((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 ->
return Nothing
3 -> do
_T <- go
return (Just _T)
_ ->
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)
29 -> do
l <- go
n <- Decoding.decodeListLen
let decodeWithComponent = do
tokenType₂ <- Decoding.peekTokenType
case tokenType₂ of
TypeString -> do
fmap WithLabel Decoding.decodeString
_ -> do
m <- Decoding.decodeInt
case m of
0 -> return WithQuestion
_ -> die ("Unexpected integer encoding a with expression: " <> show n)
ks₀ <- replicateDecoder n decodeWithComponent
ks₁ <- case NonEmpty.nonEmpty ks₀ of
Nothing ->
die "0 field labels in decoded with expression"
Just ks₁ ->
return ks₁
r <- go
return (With l ks₁ r)
30 -> do
_YYYY <- Decoding.decodeInt
_MM <- Decoding.decodeInt
_HH <- Decoding.decodeInt
case Time.fromGregorianValid (fromIntegral _YYYY) _MM _HH of
Nothing ->
die "Invalid date"
Just day ->
return (DateLiteral day)
31 -> do
hh <- Decoding.decodeInt
mm <- Decoding.decodeInt
tag₂ <- Decoding.decodeTag
case tag₂ of
4 -> do
return ()
_ -> do
die ("Unexpected tag for decimal fraction: " <> show tag)
n <- Decoding.decodeListLen
case n of
2 -> do
return ()
_ -> do
die ("Invalid list length for decimal fraction: " <> show n)
exponent <- Decoding.decodeInt
tokenType₂ <- Decoding.peekTokenType
mantissa <- case tokenType₂ of
TypeUInt -> do
fromIntegral <$> Decoding.decodeWord
TypeUInt64 -> do
fromIntegral <$> Decoding.decodeWord64
TypeNInt -> do
!i <- fromIntegral <$> Decoding.decodeNegWord
return (-1 - i)
TypeNInt64 -> do
!i <- fromIntegral <$> Decoding.decodeNegWord64
return (-1 - i)
TypeInteger -> do
Decoding.decodeInteger
_ ->
die ("Unexpected token type for mantissa: " <> show tokenType₂)
let precision = fromIntegral (negate exponent)
let ss = fromRational (mantissa % (10 ^ precision))
return (TimeLiteral (Time.TimeOfDay hh mm ss) precision)
32 -> do
b <- Decoding.decodeBool
_HH <- Decoding.decodeInt
_MM <- Decoding.decodeInt
let sign = if b then id else negate
let minutes = sign (_HH * 60 + _MM)
return (TimeZoneLiteral (Time.TimeZone minutes False ""))
34 -> do
t <- go
return (ShowConstructor t)
_ ->
die ("Unexpected tag: " <> show tag)
_ ->
die ("Unexpected tag type: " <> show tokenType₁)
_ ->
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.encodeUtf8ByteArray "Natural/build"
NaturalFold ->
Encoding.encodeUtf8ByteArray "Natural/fold"
NaturalIsZero ->
Encoding.encodeUtf8ByteArray "Natural/isZero"
NaturalEven ->
Encoding.encodeUtf8ByteArray "Natural/even"
NaturalOdd ->
Encoding.encodeUtf8ByteArray "Natural/odd"
NaturalToInteger ->
Encoding.encodeUtf8ByteArray "Natural/toInteger"
NaturalShow ->
Encoding.encodeUtf8ByteArray "Natural/show"
NaturalSubtract ->
Encoding.encodeUtf8ByteArray "Natural/subtract"
IntegerToDouble ->
Encoding.encodeUtf8ByteArray "Integer/toDouble"
IntegerClamp ->
Encoding.encodeUtf8ByteArray "Integer/clamp"
IntegerNegate ->
Encoding.encodeUtf8ByteArray "Integer/negate"
IntegerShow ->
Encoding.encodeUtf8ByteArray "Integer/show"
DoubleShow ->
Encoding.encodeUtf8ByteArray "Double/show"
ListBuild ->
Encoding.encodeUtf8ByteArray "List/build"
ListDrop ->
Encoding.encodeUtf8ByteArray "List/drop"
ListFold ->
Encoding.encodeUtf8ByteArray "List/fold"
ListLength ->
Encoding.encodeUtf8ByteArray "List/length"
ListHead ->
Encoding.encodeUtf8ByteArray "List/head"
ListLast ->
Encoding.encodeUtf8ByteArray "List/last"
ListIndexed ->
Encoding.encodeUtf8ByteArray "List/indexed"
ListReverse ->
Encoding.encodeUtf8ByteArray "List/reverse"
ListTake ->
Encoding.encodeUtf8ByteArray "List/take"
Bool ->
Encoding.encodeUtf8ByteArray "Bool"
Optional ->
Encoding.encodeUtf8ByteArray "Optional"
None ->
Encoding.encodeUtf8ByteArray "None"
Natural ->
Encoding.encodeUtf8ByteArray "Natural"
Integer ->
Encoding.encodeUtf8ByteArray "Integer"
Double ->
Encoding.encodeUtf8ByteArray "Double"
Text ->
Encoding.encodeUtf8ByteArray "Text"
TextReplace ->
Encoding.encodeUtf8ByteArray "Text/replace"
TextShow ->
Encoding.encodeUtf8ByteArray "Text/show"
Date ->
Encoding.encodeUtf8ByteArray "Date"
Time ->
Encoding.encodeUtf8ByteArray "Time"
TimeZone ->
Encoding.encodeUtf8ByteArray "TimeZone"
List ->
Encoding.encodeUtf8ByteArray "List"
Const Type ->
Encoding.encodeUtf8ByteArray "Type"
Const Kind ->
Encoding.encodeUtf8ByteArray "Kind"
Const Sort ->
Encoding.encodeUtf8ByteArray "Sort"
a@App{} ->
encodeListN
(2 + length arguments)
( Encoding.encodeInt 0
: go function
: map go arguments
)
where
(function, arguments) = unApply a
Lam _ (FunctionBinding { functionBindingVariable = "_", functionBindingAnnotation = _A }) b ->
encodeList3
(Encoding.encodeInt 1)
(go _A)
(go b)
Lam _ (FunctionBinding { functionBindingVariable = x, functionBindingAnnotation = _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 . recordFieldValue) xTs)
RecordLit xts ->
encodeList2
(Encoding.encodeInt 8)
(encodeMapWith (go. recordFieldValue) xts)
Field t (Syntax.fieldSelectionLabel -> x) ->
encodeList3
(Encoding.encodeInt 9)
(go t)
(Encoding.encodeString x)
Project t (Left xs) ->
encodeListN
(2 + length xs)
( Encoding.encodeInt 10
: go t
: map Encoding.encodeString 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 ->