Copyright	© 2015–present Megaparsec contributors
License	FreeBSD
Maintainer	Mark Karpov <markkarpov92@gmail.com>
Stability	experimental
Portability	portable
Safe Haskell	Safe
Language	Haskell2010

Text.Megaparsec.Error.Builder

Contents

Top-level helpers
Error components
Data types

Description

A set of helpers that should make construction of ParseErrors more concise. This is primarily useful in test suites and for debugging.

Since: 6.0.0

Synopsis

err :: Int -> ET s -> ParseError s e
errFancy :: Int -> EF e -> ParseError s e
utok :: Stream s => Token s -> ET s
utoks :: forall s. Stream s => Tokens s -> ET s
ulabel :: Stream s => String -> ET s
ueof :: Stream s => ET s
etok :: Stream s => Token s -> ET s
etoks :: forall s. Stream s => Tokens s -> ET s
elabel :: Stream s => String -> ET s
eeof :: Stream s => ET s
fancy :: ErrorFancy e -> EF e
data ET s
data EF e

Top-level helpers

err Source #

Arguments

:: Int	`ParseError` offset
-> ET s	Error components
-> ParseError s e	Resulting `ParseError`

Assemble a ParseError from the offset and the ET t value. ET t is a monoid and can be assembled by combining primitives provided by this module, see below.

errFancy Source #

Arguments

:: Int	`ParseError` offset
-> EF e	Error components
-> ParseError s e	Resulting `ParseError`

Like err, but constructs a “fancy” ParseError.

Error components

utok :: Stream s => Token s -> ET s Source #

Construct an “unexpected token” error component.

utoks :: forall s. Stream s => Tokens s -> ET s Source #

Construct an “unexpected tokens” error component. Empty chunk produces EndOfInput.

ulabel :: Stream s => String -> ET s Source #

Construct an “unexpected label” error component. Do not use with empty strings (for empty strings it's bottom).

ueof :: Stream s => ET s Source #

Construct an “unexpected end of input” error component.

etok :: Stream s => Token s -> ET s Source #

Construct an “expected token” error component.

etoks :: forall s. Stream s => Tokens s -> ET s Source #

Construct an “expected tokens” error component. Empty chunk produces EndOfInput.

elabel :: Stream s => String -> ET s Source #

Construct an “expected label” error component. Do not use with empty strings.

eeof :: Stream s => ET s Source #

Construct an “expected end of input” error component.

fancy :: ErrorFancy e -> EF e Source #

Construct a custom error component.

Data types

data ET s Source #

Auxiliary type for construction of trivial parse errors.

Instances

Instances details

(Data s, Data (Token s), Ord (Token s)) => Data (ET s) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> ET s -> c (ET s) # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (ET s) # toConstr :: ET s -> Constr # dataTypeOf :: ET s -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (ET s)) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (ET s)) # gmapT :: (forall b. Data b => b -> b) -> ET s -> ET s # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> ET s -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> ET s -> r # gmapQ :: (forall d. Data d => d -> u) -> ET s -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> ET s -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> ET s -> m (ET s) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> ET s -> m (ET s) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> ET s -> m (ET s) #
Stream s => Monoid (ET s) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Methods mempty :: ET s # mappend :: ET s -> ET s -> ET s # mconcat :: [ET s] -> ET s #
Stream s => Semigroup (ET s) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Methods (<>) :: ET s -> ET s -> ET s # sconcat :: NonEmpty (ET s) -> ET s # stimes :: Integral b => b -> ET s -> ET s #
Generic (ET s) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Associated Types type Rep (ET s) :: Type -> Type # Methods from :: ET s -> Rep (ET s) x # to :: Rep (ET s) x -> ET s #
Eq (Token s) => Eq (ET s) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Methods (==) :: ET s -> ET s -> Bool # (/=) :: ET s -> ET s -> Bool #
Ord (Token s) => Ord (ET s) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Methods compare :: ET s -> ET s -> Ordering # (<) :: ET s -> ET s -> Bool # (<=) :: ET s -> ET s -> Bool # (>) :: ET s -> ET s -> Bool # (>=) :: ET s -> ET s -> Bool # max :: ET s -> ET s -> ET s # min :: ET s -> ET s -> ET s #
type Rep (ET s) Source #
Instance details Defined in Text.Megaparsec.Error.Builder type Rep (ET s) = D1 ('MetaData "ET" "Text.Megaparsec.Error.Builder" "megaparsec-9.2.2-Bh5JbmGMk2pDR4NazpOEEQ" 'False) (C1 ('MetaCons "ET" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe (ErrorItem (Token s)))) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Set (ErrorItem (Token s))))))

data EF e Source #

Auxiliary type for construction of fancy parse errors.

Instances

Instances details

(Data e, Ord e) => Data (EF e) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> EF e -> c (EF e) # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (EF e) # toConstr :: EF e -> Constr # dataTypeOf :: EF e -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (EF e)) # dataCast2 :: Typeable t => (forall d e0. (Data d, Data e0) => c (t d e0)) -> Maybe (c (EF e)) # gmapT :: (forall b. Data b => b -> b) -> EF e -> EF e # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> EF e -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> EF e -> r # gmapQ :: (forall d. Data d => d -> u) -> EF e -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> EF e -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> EF e -> m (EF e) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> EF e -> m (EF e) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> EF e -> m (EF e) #
Ord e => Monoid (EF e) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Methods mempty :: EF e # mappend :: EF e -> EF e -> EF e # mconcat :: [EF e] -> EF e #
Ord e => Semigroup (EF e) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Methods (<>) :: EF e -> EF e -> EF e # sconcat :: NonEmpty (EF e) -> EF e # stimes :: Integral b => b -> EF e -> EF e #
Generic (EF e) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Associated Types type Rep (EF e) :: Type -> Type # Methods from :: EF e -> Rep (EF e) x # to :: Rep (EF e) x -> EF e #
Eq e => Eq (EF e) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Methods (==) :: EF e -> EF e -> Bool # (/=) :: EF e -> EF e -> Bool #
Ord e => Ord (EF e) Source #
Instance details Defined in Text.Megaparsec.Error.Builder Methods compare :: EF e -> EF e -> Ordering # (<) :: EF e -> EF e -> Bool # (<=) :: EF e -> EF e -> Bool # (>) :: EF e -> EF e -> Bool # (>=) :: EF e -> EF e -> Bool # max :: EF e -> EF e -> EF e # min :: EF e -> EF e -> EF e #
type Rep (EF e) Source #
Instance details Defined in Text.Megaparsec.Error.Builder type Rep (EF e) = D1 ('MetaData "EF" "Text.Megaparsec.Error.Builder" "megaparsec-9.2.2-Bh5JbmGMk2pDR4NazpOEEQ" 'True) (C1 ('MetaCons "EF" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Set (ErrorFancy e)))))