| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
Data.Yaml
Contents
Description
Provides a high-level interface for processing YAML files.
This module reuses most of the infrastructure from the aeson package.
This means that you can use all of the existing tools for JSON
processing for processing YAML files. As a result, much of the
documentation below mentions JSON; do not let that confuse you, it's
intentional.
For the most part, YAML content translates directly into JSON, and therefore there is very little data loss. If you need to deal with YAML more directly (e.g., directly deal with aliases), you should use the Text.Libyaml module instead.
For documentation on the aeson types, functions, classes, and
operators, please see the Data.Aeson module of the aeson package.
Look in the examples directory of the source repository for some initial pointers on how to use this library.
Synopsis
- encode :: ToJSON a => a -> ByteString
- encodeFile :: ToJSON a => FilePath -> a -> IO ()
- decodeEither' :: FromJSON a => ByteString -> Either ParseException a
- decodeFileEither :: FromJSON a => FilePath -> IO (Either ParseException a)
- decodeThrow :: (MonadThrow m, FromJSON a) => ByteString -> m a
- decodeFileThrow :: (MonadIO m, FromJSON a) => FilePath -> m a
- decodeHelper :: FromJSON a => ConduitM () Event Parse () -> IO (Either ParseException (Either String a))
- data Value
- data Parser a
- type Object = HashMap Text Value
- type Array = Vector Value
- data ParseException
- prettyPrintParseException :: ParseException -> String
- data YamlException
- data YamlMark = YamlMark {}
- object :: [Pair] -> Value
- array :: [Value] -> Value
- (.=) :: (KeyValue kv, ToJSON v) => Text -> v -> kv
- (.:) :: FromJSON a => Object -> Text -> Parser a
- (.:?) :: FromJSON a => Object -> Text -> Parser (Maybe a)
- (.!=) :: Parser (Maybe a) -> a -> Parser a
- withObject :: String -> (Object -> Parser a) -> Value -> Parser a
- withText :: String -> (Text -> Parser a) -> Value -> Parser a
- withArray :: String -> (Array -> Parser a) -> Value -> Parser a
- withScientific :: String -> (Scientific -> Parser a) -> Value -> Parser a
- withBool :: String -> (Bool -> Parser a) -> Value -> Parser a
- parseMonad :: Monad m => (a -> Parser b) -> a -> m b
- parseEither :: (a -> Parser b) -> a -> Either String b
- parseMaybe :: (a -> Parser b) -> a -> Maybe b
- class ToJSON a where
- class FromJSON a where
- decode :: FromJSON a => ByteString -> Maybe a
- decodeFile :: FromJSON a => FilePath -> IO (Maybe a)
- decodeEither :: FromJSON a => ByteString -> Either String a
Encoding
encode :: ToJSON a => a -> ByteString Source #
Encode a value into its YAML representation.
encodeFile :: ToJSON a => FilePath -> a -> IO () Source #
Encode a value into its YAML representation and save to the given file.
Decoding
decodeEither' :: FromJSON a => ByteString -> Either ParseException a Source #
More helpful version of decodeEither which returns the YamlException.
Since: yaml-0.8.3
decodeFileEither :: FromJSON a => FilePath -> IO (Either ParseException a) Source #
A version of decodeFile which should not throw runtime exceptions.
Since: yaml-0.8.4
decodeThrow :: (MonadThrow m, FromJSON a) => ByteString -> m a Source #
A version of decodeEither' lifted to MonadThrow
Since: yaml-0.8.31
decodeFileThrow :: (MonadIO m, FromJSON a) => FilePath -> m a Source #
A version of decodeFileEither lifted to MonadIO
Since: yaml-0.8.31
More control over decoding
decodeHelper :: FromJSON a => ConduitM () Event Parse () -> IO (Either ParseException (Either String a)) Source #
Types
A JSON value represented as a Haskell value.
Instances
| Eq Value | |
| Data Value | |
Defined in Data.Aeson.Types.Internal Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Value -> c Value # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Value # dataTypeOf :: Value -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Value) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Value) # gmapT :: (forall b. Data b => b -> b) -> Value -> Value # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Value -> r # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Value -> r # gmapQ :: (forall d. Data d => d -> u) -> Value -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> Value -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Value -> m Value # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Value -> m Value # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Value -> m Value # | |
| Read Value | |
| Show Value | |
| IsString Value | |
Defined in Data.Aeson.Types.Internal Methods fromString :: String -> Value # | |
| Generic Value | |
| Lift Value | |
| Hashable Value | |
Defined in Data.Aeson.Types.Internal | |
| ToJSON Value | |
Defined in Data.Aeson.Types.ToJSON | |
| KeyValue Pair | |
| FromJSON Value | |
| NFData Value | |
Defined in Data.Aeson.Types.Internal | |
| FromString Encoding | |
Defined in Data.Aeson.Types.ToJSON Methods fromString :: String -> Encoding | |
| FromString Value | |
Defined in Data.Aeson.Types.ToJSON Methods fromString :: String -> Value | |
| GToJSON Encoding arity (U1 :: * -> *) | |
| GToJSON Value arity (U1 :: * -> *) | |
| ToJSON1 f => GToJSON Encoding One (Rec1 f) | |
| ToJSON1 f => GToJSON Value One (Rec1 f) | |
| ToJSON a => GToJSON Encoding arity (K1 i a :: * -> *) | |
| (EncodeProduct arity a, EncodeProduct arity b) => GToJSON Encoding arity (a :*: b) | |
| ToJSON a => GToJSON Value arity (K1 i a :: * -> *) | |
| (WriteProduct arity a, WriteProduct arity b, ProductSize a, ProductSize b) => GToJSON Value arity (a :*: b) | |
| (ToJSON1 f, GToJSON Encoding One g) => GToJSON Encoding One (f :.: g) | |
| (ToJSON1 f, GToJSON Value One g) => GToJSON Value One (f :.: g) | |
| FromPairs Value (DList Pair) | |
Defined in Data.Aeson.Types.ToJSON | |
| v ~ Value => KeyValuePair v (DList Pair) | |
Defined in Data.Aeson.Types.ToJSON | |
| (GToJSON Encoding arity a, ConsToJSON Encoding arity a, Constructor c) => SumToJSON' TwoElemArray Encoding arity (C1 c a) | |
Defined in Data.Aeson.Types.ToJSON | |
| (GToJSON Value arity a, ConsToJSON Value arity a, Constructor c) => SumToJSON' TwoElemArray Value arity (C1 c a) | |
Defined in Data.Aeson.Types.ToJSON | |
| type Rep Value | |
Defined in Data.Aeson.Types.Internal type Rep Value = D1 (MetaData "Value" "Data.Aeson.Types.Internal" "aeson-1.4.0.0-LIOMjdhUbDoEPhbHMMZ6ty" False) ((C1 (MetaCons "Object" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Object)) :+: (C1 (MetaCons "Array" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Array)) :+: C1 (MetaCons "String" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Text)))) :+: (C1 (MetaCons "Number" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Scientific)) :+: (C1 (MetaCons "Bool" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Bool)) :+: C1 (MetaCons "Null" PrefixI False) (U1 :: * -> *)))) | |
A JSON parser. N.B. This might not fit your usual understanding of
"parser". Instead you might like to think of Parser as a "parse result",
i.e. a parser to which the input has already been applied.
data ParseException Source #
Constructors
| NonScalarKey | |
| UnknownAlias | |
Fields | |
| UnexpectedEvent | |
| InvalidYaml (Maybe YamlException) | |
| AesonException String | |
| OtherParseException SomeException | |
| NonStringKeyAlias AnchorName Value | |
| CyclicIncludes | |
Instances
| Show ParseException Source # | |
Defined in Data.Yaml.Internal Methods showsPrec :: Int -> ParseException -> ShowS # show :: ParseException -> String # showList :: [ParseException] -> ShowS # | |
| Exception ParseException Source # | |
Defined in Data.Yaml.Internal Methods toException :: ParseException -> SomeException # | |
prettyPrintParseException :: ParseException -> String Source #
Alternative to show to display a ParseException on the screen.
Instead of displaying the data constructors applied to their arguments,
a more textual output is returned. For example, instead of printing:
InvalidYaml (Just (YamlParseException {yamlProblem = "did not find expected ',' or '}'", yamlContext = "while parsing a flow mapping", yamlProblemMark = YamlMark {yamlIndex = 42, yamlLine = 2, yamlColumn = 12}})))It looks more pleasant to print:
YAML parse exception at line 2, column 12, while parsing a flow mapping: did not find expected ',' or '}'
Since 0.8.11
data YamlException Source #
Constructors
| YamlException String | |
| YamlParseException | problem, context, index, position line, position column |
Fields | |
Instances
| Show YamlException Source # | |
Defined in Text.Libyaml Methods showsPrec :: Int -> YamlException -> ShowS # show :: YamlException -> String # showList :: [YamlException] -> ShowS # | |
| Exception YamlException Source # | |
Defined in Text.Libyaml Methods toException :: YamlException -> SomeException # fromException :: SomeException -> Maybe YamlException # displayException :: YamlException -> String # | |
The pointer position
Constructors and accessors
(.:) :: FromJSON a => Object -> Text -> Parser a #
Retrieve the value associated with the given key of an Object.
The result is empty if the key is not present or the value cannot
be converted to the desired type.
This accessor is appropriate if the key and value must be present
in an object for it to be valid. If the key and value are
optional, use .:? instead.
(.:?) :: FromJSON a => Object -> Text -> Parser (Maybe a) #
Retrieve the value associated with the given key of an Object. The
result is Nothing if the key is not present or if its value is Null,
or empty if the value cannot be converted to the desired type.
This accessor is most useful if the key and value can be absent
from an object without affecting its validity. If the key and
value are mandatory, use .: instead.
(.!=) :: Parser (Maybe a) -> a -> Parser a #
Helper for use in combination with .:? to provide default
values for optional JSON object fields.
This combinator is most useful if the key and value can be absent
from an object without affecting its validity and we know a default
value to assign in that case. If the key and value are mandatory,
use .: instead.
Example usage:
v1 <- o.:?"opt_field_with_dfl" .!= "default_val" v2 <- o.:"mandatory_field" v3 <- o.:?"opt_field2"
With helpers (since 0.8.23)
withObject :: String -> (Object -> Parser a) -> Value -> Parser a #
withObject expected f valuef to the Object when value
is an Object and fails using typeMismatch expected
withText :: String -> (Text -> Parser a) -> Value -> Parser a #
withText expected f valuef to the Text when value is a
String and fails using typeMismatch expected
withArray :: String -> (Array -> Parser a) -> Value -> Parser a #
withArray expected f valuef to the Array when value is
an Array and fails using typeMismatch expected
withScientific :: String -> (Scientific -> Parser a) -> Value -> Parser a #
withScientific expected f valuef to the Scientific number
when value is a Number and fails using typeMismatch expectedInteger you may want to add a restriction on the
size of the exponent (see withBoundedScientific) to prevent
malicious input from filling up the memory of the target system.
withBool :: String -> (Bool -> Parser a) -> Value -> Parser a #
withBool expected f valuef to the Bool when value is a
Bool and fails using typeMismatch expected
Parsing
parseMonad :: Monad m => (a -> Parser b) -> a -> m b Source #
parseEither :: (a -> Parser b) -> a -> Either String b #
Classes
A type that can be converted to JSON.
Instances in general must specify toJSON and should (but don't need
to) specify toEncoding.
An example type and instance:
-- Allow ourselves to writeTextliterals. {-# LANGUAGE OverloadedStrings #-} data Coord = Coord { x :: Double, y :: Double } instanceToJSONCoord wheretoJSON(Coord x y) =object["x".=x, "y".=y]toEncoding(Coord x y) =pairs("x".=x<>"y".=y)
Instead of manually writing your ToJSON instance, there are two options
to do it automatically:
- Data.Aeson.TH provides Template Haskell functions which will derive an instance at compile time. The generated instance is optimized for your type so it will probably be more efficient than the following option.
- The compiler can provide a default generic implementation for
toJSON.
To use the second, simply add a deriving clause to your
datatype and declare a GenericToJSON instance. If you require nothing other than
defaultOptions, it is sufficient to write (and this is the only
alternative where the default toJSON implementation is sufficient):
{-# LANGUAGE DeriveGeneric #-}
import GHC.Generics
data Coord = Coord { x :: Double, y :: Double } deriving Generic
instance ToJSON Coord where
toEncoding = genericToEncoding defaultOptions
If on the other hand you wish to customize the generic decoding, you have to implement both methods:
customOptions =defaultOptions{fieldLabelModifier=maptoUpper} instanceToJSONCoord wheretoJSON=genericToJSONcustomOptionstoEncoding=genericToEncodingcustomOptions
Previous versions of this library only had the toJSON method. Adding
toEncoding had to reasons:
- toEncoding is more efficient for the common case that the output of
toJSONis directly serialized to aByteString. Further, expressing either method in terms of the other would be non-optimal. - The choice of defaults allows a smooth transition for existing users:
Existing instances that do not define
toEncodingstill compile and have the correct semantics. This is ensured by making the default implementation oftoEncodingusetoJSON. This produces correct results, but since it performs an intermediate conversion to aValue, it will be less efficient than directly emitting anEncoding. (this also means that specifying nothing more thaninstance ToJSON Coordwould be sufficient as a generically decoding instance, but there probably exists no good reason to not specifytoEncodingin new instances.)
Methods
Convert a Haskell value to a JSON-friendly intermediate type.
toEncoding :: a -> Encoding #
Encode a Haskell value as JSON.
The default implementation of this method creates an
intermediate Value using toJSON. This provides
source-level compatibility for people upgrading from older
versions of this library, but obviously offers no performance
advantage.
To benefit from direct encoding, you must provide an
implementation for this method. The easiest way to do so is by
having your types implement Generic using the DeriveGeneric
extension, and then have GHC generate a method body as follows.
instanceToJSONCoord wheretoEncoding=genericToEncodingdefaultOptions
toJSONList :: [a] -> Value #
toEncodingList :: [a] -> Encoding #
Instances
A type that can be converted from JSON, with the possibility of failure.
In many cases, you can get the compiler to generate parsing code for you (see below). To begin, let's cover writing an instance by hand.
There are various reasons a conversion could fail. For example, an
Object could be missing a required key, an Array could be of
the wrong size, or a value could be of an incompatible type.
The basic ways to signal a failed conversion are as follows:
emptyandmzerowork, but are terse and uninformative;failyields a custom error message;typeMismatchproduces an informative message for cases when the value encountered is not of the expected type.
An example type and instance using typeMismatch:
-- Allow ourselves to writeTextliterals. {-# LANGUAGE OverloadedStrings #-} data Coord = Coord { x :: Double, y :: Double } instanceFromJSONCoord whereparseJSON(Objectv) = Coord<$>v.:"x"<*>v.:"y" -- We do not expect a non-Objectvalue here. -- We could usemzeroto fail, buttypeMismatch-- gives a much more informative error message.parseJSONinvalid =typeMismatch"Coord" invalid
For this common case of only being concerned with a single
type of JSON value, the functions withObject, withNumber, etc.
are provided. Their use is to be preferred when possible, since
they are more terse. Using withObject, we can rewrite the above instance
(assuming the same language extension and data type) as:
instanceFromJSONCoord whereparseJSON=withObject"Coord" $ \v -> Coord<$>v.:"x"<*>v.:"y"
Instead of manually writing your FromJSON instance, there are two options
to do it automatically:
- Data.Aeson.TH provides Template Haskell functions which will derive an instance at compile time. The generated instance is optimized for your type so it will probably be more efficient than the following option.
- The compiler can provide a default generic implementation for
parseJSON.
To use the second, simply add a deriving clause to your
datatype and declare a GenericFromJSON instance for your datatype without giving
a definition for parseJSON.
For example, the previous example can be simplified to just:
{-# LANGUAGE DeriveGeneric #-}
import GHC.Generics
data Coord = Coord { x :: Double, y :: Double } deriving Generic
instance FromJSON Coord
The default implementation will be equivalent to
parseJSON = ; If you need different
options, you can customize the generic decoding by defining:genericParseJSON defaultOptions
customOptions =defaultOptions{fieldLabelModifier=maptoUpper} instanceFromJSONCoord whereparseJSON=genericParseJSONcustomOptions
Instances
Deprecated
decode :: FromJSON a => ByteString -> Maybe a Source #
Deprecated: Please use decodeEither or decodeThrow, which provide information on how the decode failed
decodeFile :: FromJSON a => FilePath -> IO (Maybe a) Source #
Deprecated: Please use decodeFileEither, which does not confused type-directed and runtime exceptions.
decodeEither :: FromJSON a => ByteString -> Either String a Source #
Deprecated: Please use decodeEither' or decodeThrow, which provide more useful failures