Safe Haskell	Safe
Language	Haskell2010

Data.TypedEncoding.Common.Class.Superset

Synopsis

type family IsSuperset (y :: Symbol) (x :: Symbol) :: Bool where ...
type family IsSupersetOpen (big :: Symbol) (nm :: Symbol) (alg :: Symbol) (nmltrs :: [Symbol]) :: Bool
type Superset big small = IsSuperset big small ~ True
injectInto :: forall y x xs c str. IsSuperset y x ~ True => Enc (x ': xs) c str -> Enc (y ': xs) c str
propSuperset' :: forall algb algs b s str. (Superset b s, Eq str) => Encoding (Either EncodeEx) b algb () str -> Encoding (Either EncodeEx) s algs () str -> str -> Bool
propSuperset_ :: forall b s str algb algs. (Superset b s, Eq str, AlgNm b ~ algb, AlgNm s ~ algs) => Encoding (Either EncodeEx) b algb () str -> Encoding (Either EncodeEx) s algs () str -> str -> Bool
class EncodingSuperset (enc :: Symbol) where
- type EncSuperset enc :: Symbol
- implEncInto :: forall xs c str. Enc (enc ': xs) c str -> Enc (EncSuperset enc ': (enc ': xs)) c str
_encodesInto :: forall y enc xs c str r. (IsSuperset y r ~ True, EncodingSuperset enc, r ~ EncSuperset enc) => Enc (enc ': xs) c str -> Enc (y ': (enc ': xs)) c str
propEncodesInto' :: forall algb algr b r str. (EncodingSuperset b, r ~ EncSuperset b, Eq str) => Encoding (Either EncodeEx) b algb () str -> Encoding (Either EncodeEx) r algr () str -> str -> Bool
propEncodesInto_ :: forall b r str algb algr. (EncodingSuperset b, r ~ EncSuperset b, Eq str, AlgNm b ~ algb, AlgNm r ~ algr) => Encoding (Either EncodeEx) b algb () str -> Encoding (Either EncodeEx) r algr () str -> str -> Bool
class AllEncodeInto (superset :: Symbol) (encnms :: [Symbol])
tstChar8Encodable :: forall nms. AllEncodeInto "r-CHAR8" nms => String
tstD76Encodable :: forall nms. AllEncodeInto "r-UNICODE.D76" nms => String
tstUTF8Encodable :: forall nms. AllEncodeInto "r-UTF8" nms => String

Documentation

>>> :set -XOverloadedStrings -XMultiParamTypeClasses -XDataKinds -XTypeApplications
>>> import           Data.TypedEncoding
>>> import           Data.TypedEncoding.Instances.Restriction.UTF8 ()
>>> import           Data.TypedEncoding.Instances.Restriction.ASCII ()
>>> import           Data.Text as T

type family IsSuperset (y :: Symbol) (x :: Symbol) :: Bool where ... Source #

Replaces previous Superset typeclass.

Subsets are useful for restriction encodings like r-UFT8 but should not be used for other encodings as this would be dangerous. For example, considering "enc-" encoding as a superset of "r-" encoding would permit converting encoded binary "Enc '["enc-"] c ByteString to "Enc '["r-ASCII"] c ByteString and then to "Enc '["r-ASCII"] c Text, which could result in runtime errors.

The requirement is that that the decoding in the superset can replace the decoding from injected subset.

IsSuperset bigger smaller reads as bigger is a superset of smaller

Note, no IsSuperset "r-UNICODE.D76" "r-CHAR8" even though the numeric range of D76 includes all CHAR8 bytes. This is more nominal decision that prevents certain unwanted conversions from being possible.

Since: 0.2.2.0

Equations

IsSuperset "r-ASCII" "r-ASCII" = True
IsSuperset "r-UTF8" "r-ASCII" = True
IsSuperset "r-UTF8" "r-UTF8" = True
IsSuperset "r-CHAR8" "r-ASCII" = True
IsSuperset "r-CHAR8" "r-ByteRep" = True
IsSuperset "r-CHAR8" x = Or (IsSuperset "r-ASCII" x) (IsSupersetOpen "r-CHAR8" x (TakeUntil x ":") (ToList x))
IsSuperset "r-UNICODE.D76" "r-UNICODE.D76" = True
IsSuperset "r-UNICODE.D76" "r-ASCII" = True
IsSuperset "r-UNICODE.D76" x = Or (IsSuperset "r-CHAR8" x) (IsSupersetOpen "r-UNICODE.D76" x (TakeUntil x ":") (ToList x))
IsSuperset y x = IsSupersetOpen y x (TakeUntil x ":") (ToList x)

type family IsSupersetOpen (big :: Symbol) (nm :: Symbol) (alg :: Symbol) (nmltrs :: [Symbol]) :: Bool Source #

Since: 0.2.2.0

Instances

type IsSupersetOpen "r-ASCII" x "r-ban" xs Source #
Instance details Defined in Data.TypedEncoding.Instances.Restriction.BoundedAlphaNums type IsSupersetOpen "r-ASCII" x "r-ban" xs = True

type Superset big small = IsSuperset big small ~ True Source #

injectInto :: forall y x xs c str. IsSuperset y x ~ True => Enc (x ': xs) c str -> Enc (y ': xs) c str Source #

>>> let Right tstAscii = encodeFAll . toEncoding () $ "Hello World" :: Either EncodeEx (Enc '["r-ASCII"] () T.Text)
>>> displ (injectInto @ "r-UTF8" tstAscii)
"Enc '[r-UTF8] () (Text Hello World)"

Since: 0.2.2.0

propSuperset' :: forall algb algs b s str. (Superset b s, Eq str) => Encoding (Either EncodeEx) b algb () str -> Encoding (Either EncodeEx) s algs () str -> str -> Bool Source #

Test for Supersets defined in this module

Actual tests in the project test suite.

propSuperset_ :: forall b s str algb algs. (Superset b s, Eq str, AlgNm b ~ algb, AlgNm s ~ algs) => Encoding (Either EncodeEx) b algb () str -> Encoding (Either EncodeEx) s algs () str -> str -> Bool Source #

class EncodingSuperset (enc :: Symbol) where Source #

IsSuperset is not intended for "enc-" encodings. This class is.

It allows to specify constraints that say, for example, that Base 64 encodes into a subset of ASCII.

Since: 0.3.0.0

Minimal complete definition

Nothing

Associated Types

type EncSuperset enc :: Symbol Source #

Methods

implEncInto :: forall xs c str. Enc (enc ': xs) c str -> Enc (EncSuperset enc ': (enc ': xs)) c str Source #

Warning: Using this method at the call site may not be backward compatible between minor version upgrades, use _encodesInto instead.

Instances

EncodingSuperset "enc-B64" Source #	This is not precise, actually Base 64 uses a subset of ASCII and that would require a new definition `"r-B64"`. This instance likely to be changed / corrected in the future if `"r-B64"` is defined. `>>>` `let tstB64 = encodeAll . toEncoding () $ "Hello World" :: Enc '["enc-B64"] () B.ByteString``>>>` `displ (_encodesInto @"r-ASCII" $ tstB64)`"Enc '[r-ASCII,enc-B64] () (ByteString SGVsbG8gV29ybGQ=)" `>>>` `displ (_encodesInto @"r-UTF8" $ tstB64)`"Enc '[r-UTF8,enc-B64] () (ByteString SGVsbG8gV29ybGQ=)" Since: 0.3.0.0
Instance details Defined in Data.TypedEncoding.Instances.Enc.Base64 Associated Types type EncSuperset "enc-B64" :: Symbol Source # Methods implEncInto :: Enc ("enc-B64" ': xs) c str -> Enc (EncSuperset "enc-B64" ': ("enc-B64" ': xs)) c str Source #
EncodingSuperset "enc-B64-len" Source #	`>>>` `tstChar8Encodable @ '["enc-B64-len", "enc-B64"]`"I am CHAR8 encodable"
Instance details Defined in Data.TypedEncoding.Instances.Enc.Base64 Associated Types type EncSuperset "enc-B64-len" :: Symbol Source # Methods implEncInto :: Enc ("enc-B64-len" ': xs) c str -> Enc (EncSuperset "enc-B64-len" ': ("enc-B64-len" ': xs)) c str Source #

_encodesInto :: forall y enc xs c str r. (IsSuperset y r ~ True, EncodingSuperset enc, r ~ EncSuperset enc) => Enc (enc ': xs) c str -> Enc (y ': (enc ': xs)) c str Source #

propEncodesInto' :: forall algb algr b r str. (EncodingSuperset b, r ~ EncSuperset b, Eq str) => Encoding (Either EncodeEx) b algb () str -> Encoding (Either EncodeEx) r algr () str -> str -> Bool Source #

validates superset restriction

Actual tests in the project test suite.

propEncodesInto_ :: forall b r str algb algr. (EncodingSuperset b, r ~ EncSuperset b, Eq str, AlgNm b ~ algb, AlgNm r ~ algr) => Encoding (Either EncodeEx) b algb () str -> Encoding (Either EncodeEx) r algr () str -> str -> Bool Source #

class AllEncodeInto (superset :: Symbol) (encnms :: [Symbol]) Source #

Aggregate version of EncodingSuperset

This is not ideal but easy to implement. The issue is that this assumes restricted co-domain which is what often happens but often does not, e.g. it will not work well with id transformation.

Since: 0.4.0.0

Instances

AllEncodeInto "r-CHAR8" ([] :: [Symbol]) Source #
Instance details Defined in Data.TypedEncoding.Common.Class.Superset
AllEncodeInto "r-UNICODE.D76" ([] :: [Symbol]) Source #
Instance details Defined in Data.TypedEncoding.Common.Class.Superset
AllEncodeInto "r-UTF8" ([] :: [Symbol]) Source #
Instance details Defined in Data.TypedEncoding.Common.Class.Superset
(AllEncodeInto "r-CHAR8" xs, IsSuperset "r-CHAR8" r ~ True, EncodingSuperset enc, r ~ EncSuperset enc) => AllEncodeInto "r-CHAR8" (enc ': xs) Source #
Instance details Defined in Data.TypedEncoding.Common.Class.Superset
(AllEncodeInto "r-UNICODE.D76" xs, IsSuperset "r-UNICODE.D76" r ~ True, EncodingSuperset enc, r ~ EncSuperset enc) => AllEncodeInto "r-UNICODE.D76" (enc ': xs) Source #
Instance details Defined in Data.TypedEncoding.Common.Class.Superset
(AllEncodeInto "r-UTF8" xs, IsSuperset "r-UTF8" r ~ True, EncodingSuperset enc, r ~ EncSuperset enc) => AllEncodeInto "r-UTF8" (enc ': xs) Source #
Instance details Defined in Data.TypedEncoding.Common.Class.Superset

tstChar8Encodable :: forall nms. AllEncodeInto "r-CHAR8" nms => String Source #

tstD76Encodable :: forall nms. AllEncodeInto "r-UNICODE.D76" nms => String Source #

tstUTF8Encodable :: forall nms. AllEncodeInto "r-UTF8" nms => String Source #