Safe Haskell	None
Language	Haskell2010

Dhall.Parser

Contents

Utilities
Parsers
Types

Description

This module contains Dhall's parsing logic

Synopsis

exprFromText :: String -> Text -> Either ParseError (Expr Src Import)
exprAndHeaderFromText :: String -> Text -> Either ParseError (Header, Expr Src Import)
censor :: ParseError -> ParseError
createHeader :: Text -> Header
expr :: Parser (Expr Src Import)
exprA :: Parser a -> Parser (Expr Src a)
newtype Header = Header Text
data Src = Src {
- srcStart :: !SourcePos
- srcEnd :: !SourcePos
- srcText :: Text
}
data SourcedException e = SourcedException Src e
data ParseError = ParseError {
- unwrap :: ParseErrorBundle Text Void
- input :: Text
}
newtype Parser a = Parser {
- unParser :: Parsec Void Text a
}

Utilities

exprFromText Source #

Arguments

:: String	User-friendly name describing the input expression, used in parsing error messages
-> Text	Input expression to parse
-> Either ParseError (Expr Src Import)

Parse an expression from Expr containing a Dhall program

exprAndHeaderFromText Source #

Arguments

:: String	User-friendly name describing the input expression, used in parsing error messages
-> Text	Input expression to parse
-> Either ParseError (Header, Expr Src Import)

Like exprFromText but also returns the leading comments and whitespace (i.e. header) up to the last newline before the code begins

In other words, if you have a Dhall file of the form:

-- Comment 1
{- Comment -} 2

Then this will preserve Comment 1, but not Comment 2

This is used by dhall-format to preserve leading comments and whitespace

censor :: ParseError -> ParseError Source #

Replace the source code with spaces when rendering error messages

This utility is used to implement the --censor flag

createHeader :: Text -> Header Source #

Create a header with stripped leading spaces and trailing newlines

Parsers

expr :: Parser (Expr Src Import) Source #

Parser for a top-level Dhall expression

exprA :: Parser a -> Parser (Expr Src a) Source #

Deprecated: Support for parsing custom imports will be dropped in a future release

Parser for a top-level Dhall expression. The expression is parameterized over any parseable type, allowing the language to be extended as needed.

Types

newtype Header Source #

A header corresponds to the leading comment at the top of a Dhall file.

The header includes comment characters but is stripped of leading spaces and trailing newlines

Constructors

Text

data Src Source #

Source code extract

Constructors

Src
Fields srcStart :: !SourcePos srcEnd :: !SourcePos srcText :: Text

Instances

Eq Src Source #
Instance details Defined in Dhall.Src Methods (==) :: Src -> Src -> Bool # (/=) :: Src -> Src -> Bool #
Data Src Source #
Instance details Defined in Dhall.Src Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Src -> c Src # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Src # toConstr :: Src -> Constr # dataTypeOf :: Src -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Src) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Src) # gmapT :: (forall b. Data b => b -> b) -> Src -> Src # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Src -> r # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Src -> r # gmapQ :: (forall d. Data d => d -> u) -> Src -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> Src -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Src -> m Src # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Src -> m Src # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Src -> m Src #
Ord Src Source #
Instance details Defined in Dhall.Src Methods compare :: Src -> Src -> Ordering # (<) :: Src -> Src -> Bool # (<=) :: Src -> Src -> Bool # (>) :: Src -> Src -> Bool # (>=) :: Src -> Src -> Bool # max :: Src -> Src -> Src # min :: Src -> Src -> Src #
Show Src Source #
Instance details Defined in Dhall.Src Methods showsPrec :: Int -> Src -> ShowS # show :: Src -> String # showList :: [Src] -> ShowS #
Generic Src Source #
Instance details Defined in Dhall.Src Associated Types type Rep Src :: Type -> Type # Methods from :: Src -> Rep Src x # to :: Rep Src x -> Src #
Lift Src Source #
Instance details Defined in Dhall.Src Methods lift :: Src -> Q Exp #
NFData Src Source #
Instance details Defined in Dhall.Src Methods rnf :: Src -> () #
Pretty Src Source #
Instance details Defined in Dhall.Src Methods pretty :: Src -> Doc ann # prettyList :: [Src] -> Doc ann #
type Rep Src Source #
Instance details Defined in Dhall.Src type Rep Src = D1 (MetaData "Src" "Dhall.Src" "dhall-1.32.0-90ekLWlfiRUK7vmmlOVhVv" False) (C1 (MetaCons "Src" PrefixI True) (S1 (MetaSel (Just "srcStart") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 SourcePos) :: (S1 (MetaSel (Just "srcEnd") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 SourcePos) :: S1 (MetaSel (Just "srcText") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Text))))

data SourcedException e Source #

An exception annotated with a Src span

Constructors

SourcedException Src e

Instances

Show e => Show (SourcedException e) Source #
Instance details Defined in Dhall.Parser.Combinators Methods showsPrec :: Int -> SourcedException e -> ShowS # show :: SourcedException e -> String # showList :: [SourcedException e] -> ShowS #
Exception e => Exception (SourcedException e) Source #
Instance details Defined in Dhall.Parser.Combinators Methods toException :: SourcedException e -> SomeException # fromException :: SomeException -> Maybe (SourcedException e) # displayException :: SourcedException e -> String #

data ParseError Source #

A parsing error

Constructors

ParseError
Fields unwrap :: ParseErrorBundle Text Void input :: Text

Instances

Show ParseError Source #
Instance details Defined in Dhall.Parser Methods showsPrec :: Int -> ParseError -> ShowS # show :: ParseError -> String # showList :: [ParseError] -> ShowS #
Exception ParseError Source #
Instance details Defined in Dhall.Parser Methods toException :: ParseError -> SomeException # fromException :: SomeException -> Maybe ParseError # displayException :: ParseError -> String #

newtype Parser a Source #

A Parser that is almost identical to Text.Megaparsec.Parsec except treating Haskell-style comments as whitespace

Constructors

Parser
Fields unParser :: Parsec Void Text a

Instances

Monad Parser Source #
Instance details Defined in Dhall.Parser.Combinators Methods (>>=) :: Parser a -> (a -> Parser b) -> Parser b # (>>) :: Parser a -> Parser b -> Parser b # return :: a -> Parser a # fail :: String -> Parser a #
Functor Parser Source #
Instance details Defined in Dhall.Parser.Combinators Methods fmap :: (a -> b) -> Parser a -> Parser b # (<$) :: a -> Parser b -> Parser a #
MonadFail Parser Source #
Instance details Defined in Dhall.Parser.Combinators Methods fail :: String -> Parser a #
Applicative Parser Source #
Instance details Defined in Dhall.Parser.Combinators Methods pure :: a -> Parser a # (<>) :: Parser (a -> b) -> Parser a -> Parser b # liftA2 :: (a -> b -> c) -> Parser a -> Parser b -> Parser c # (>) :: Parser a -> Parser b -> Parser b # (<*) :: Parser a -> Parser b -> Parser a #
Alternative Parser Source #
Instance details Defined in Dhall.Parser.Combinators Methods empty :: Parser a # (<\|>) :: Parser a -> Parser a -> Parser a # some :: Parser a -> Parser [a] # many :: Parser a -> Parser [a] #
MonadPlus Parser Source #
Instance details Defined in Dhall.Parser.Combinators Methods mzero :: Parser a # mplus :: Parser a -> Parser a -> Parser a #
TokenParsing Parser Source #
Instance details Defined in Dhall.Parser.Combinators Methods someSpace :: Parser () # nesting :: Parser a -> Parser a # semi :: Parser Char # highlight :: Highlight -> Parser a -> Parser a # token :: Parser a -> Parser a #
CharParsing Parser Source #
Instance details Defined in Dhall.Parser.Combinators Methods satisfy :: (Char -> Bool) -> Parser Char # char :: Char -> Parser Char # notChar :: Char -> Parser Char # anyChar :: Parser Char # string :: String -> Parser String # text :: Text -> Parser Text #
Parsing Parser Source #
Instance details Defined in Dhall.Parser.Combinators Methods try :: Parser a -> Parser a # (<?>) :: Parser a -> String -> Parser a # skipMany :: Parser a -> Parser () # skipSome :: Parser a -> Parser () # unexpected :: String -> Parser a # eof :: Parser () # notFollowedBy :: Show a => Parser a -> Parser () #
MonadParsec Void Text Parser Source #
Instance details Defined in Dhall.Parser.Combinators Methods parseError :: ParseError Text Void -> Parser a # label :: String -> Parser a -> Parser a # hidden :: Parser a -> Parser a # try :: Parser a -> Parser a # lookAhead :: Parser a -> Parser a # notFollowedBy :: Parser a -> Parser () # withRecovery :: (ParseError Text Void -> Parser a) -> Parser a -> Parser a # observing :: Parser a -> Parser (Either (ParseError Text Void) a) # eof :: Parser () # token :: (Token Text -> Maybe a) -> Set (ErrorItem (Token Text)) -> Parser a # tokens :: (Tokens Text -> Tokens Text -> Bool) -> Tokens Text -> Parser (Tokens Text) # takeWhileP :: Maybe String -> (Token Text -> Bool) -> Parser (Tokens Text) # takeWhile1P :: Maybe String -> (Token Text -> Bool) -> Parser (Tokens Text) # takeP :: Maybe String -> Int -> Parser (Tokens Text) # getParserState :: Parser (State Text Void) # updateParserState :: (State Text Void -> State Text Void) -> Parser () #
IsString a => IsString (Parser a) Source #
Instance details Defined in Dhall.Parser.Combinators Methods fromString :: String -> Parser a #
Semigroup a => Semigroup (Parser a) Source #
Instance details Defined in Dhall.Parser.Combinators Methods (<>) :: Parser a -> Parser a -> Parser a # sconcat :: NonEmpty (Parser a) -> Parser a # stimes :: Integral b => b -> Parser a -> Parser a #
(Semigroup a, Monoid a) => Monoid (Parser a) Source #
Instance details Defined in Dhall.Parser.Combinators Methods mempty :: Parser a # mappend :: Parser a -> Parser a -> Parser a # mconcat :: [Parser a] -> Parser a #