Dhall.Parser

This module contains Dhall's parsing logic

Utilities

exprFromText

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 Text containing a Dhall program

exprAndHeaderFromText

Arguments

:: String

User-friendly name describing the input expression, used in parsing error messages

-> Text

Input expression to parse

-> Either ParseError (Text, 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
 2

Then this will preserve Comment 1, but not Comment 2

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

Parsers

expr :: Parser (Expr Src Import)

Parser for a top-level Dhall expression

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

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

Types

data Src

Source code extract

Constructors

Src !SourcePos !SourcePos Text

Instances

Eq Src

Defined in Dhall.Parser.Combinators

Methods

(==) :: Src -> Src -> Bool

(/=) :: Src -> Src -> Bool

Data Src

Defined in Dhall.Parser.Combinators

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

Show Src

Defined in Dhall.Parser.Combinators

Methods

showsPrec :: Int -> Src -> ShowS

show :: Src -> String

showList :: [Src] -> ShowS

Pretty Src

Defined in Dhall.Parser.Combinators

Methods

pretty :: Src -> Doc ann

prettyList :: [Src] -> Doc ann

data ParseError

A parsing error

Constructors

ParseError

Fields

• unwrap :: ParseErrorBundle Text Void
• input :: Text

Instances

Show ParseError

Defined in Dhall.Parser

Methods

showsPrec :: Int -> ParseError -> ShowS

show :: ParseError -> String

showList :: [ParseError] -> ShowS

Exception ParseError

Defined in Dhall.Parser

Methods

toException :: ParseError -> SomeException

fromException :: SomeException -> Maybe ParseError

displayException :: ParseError -> String

newtype Parser a

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

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

Defined in Dhall.Parser.Combinators

Methods

fmap :: (a -> b) -> Parser a -> Parser b

(<$) :: a -> Parser b -> Parser a

MonadFail Parser

Defined in Dhall.Parser.Combinators

Methods

fail :: String -> Parser a

Applicative Parser

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

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

Defined in Dhall.Parser.Combinators

Methods

mzero :: Parser a

mplus :: Parser a -> Parser a -> Parser a

TokenParsing Parser

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

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

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

Defined in Dhall.Parser.Combinators

Methods

failure :: Maybe (ErrorItem (Token Text)) -> Set (ErrorItem (Token Text)) -> Parser a

fancyFailure :: Set (ErrorFancy 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)

updateParserState :: (State Text -> State Text) -> Parser ()

IsString a => IsString (Parser a)

Defined in Dhall.Parser.Combinators

Methods

fromString :: String -> Parser a

Semigroup a => Semigroup (Parser a)

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)

Defined in Dhall.Parser.Combinators

Methods

mempty :: Parser a

mappend :: Parser a -> Parser a -> Parser a

mconcat :: [Parser a] -> Parser a