Cabal-3.3.0.0: A framework for packaging Haskell software
LicenseBSD3
Maintainercabal-devel@haskell.org
Portabilityportable
Safe HaskellNone
LanguageHaskell2010

Distribution.Fields.Parser

Description

 
Synopsis

Types

data Field ann Source #

A Cabal-like file consists of a series of fields (foo: bar) and sections (library ...).

Constructors

Field !(Name ann) [FieldLine ann] 
Section !(Name ann) [SectionArg ann] [Field ann] 

Instances

Instances details
Functor Field # 
Instance details

Defined in Distribution.Fields.Field

Methods

fmap :: (a -> b) -> Field a -> Field b Source #

(<$) :: a -> Field b -> Field a Source #

Foldable Field # 
Instance details

Defined in Distribution.Fields.Field

Methods

fold :: Monoid m => Field m -> m Source #

foldMap :: Monoid m => (a -> m) -> Field a -> m Source #

foldMap' :: Monoid m => (a -> m) -> Field a -> m Source #

foldr :: (a -> b -> b) -> b -> Field a -> b Source #

foldr' :: (a -> b -> b) -> b -> Field a -> b Source #

foldl :: (b -> a -> b) -> b -> Field a -> b Source #

foldl' :: (b -> a -> b) -> b -> Field a -> b Source #

foldr1 :: (a -> a -> a) -> Field a -> a Source #

foldl1 :: (a -> a -> a) -> Field a -> a Source #

toList :: Field a -> [a] Source #

null :: Field a -> Bool Source #

length :: Field a -> Int Source #

elem :: Eq a => a -> Field a -> Bool Source #

maximum :: Ord a => Field a -> a Source #

minimum :: Ord a => Field a -> a Source #

sum :: Num a => Field a -> a Source #

product :: Num a => Field a -> a Source #

Traversable Field # 
Instance details

Defined in Distribution.Fields.Field

Methods

traverse :: Applicative f => (a -> f b) -> Field a -> f (Field b) Source #

sequenceA :: Applicative f => Field (f a) -> f (Field a) Source #

mapM :: Monad m => (a -> m b) -> Field a -> m (Field b) Source #

sequence :: Monad m => Field (m a) -> m (Field a) Source #

Eq ann => Eq (Field ann) # 
Instance details

Defined in Distribution.Fields.Field

Methods

(==) :: Field ann -> Field ann -> Bool #

(/=) :: Field ann -> Field ann -> Bool #

Show ann => Show (Field ann) # 
Instance details

Defined in Distribution.Fields.Field

Methods

showsPrec :: Int -> Field ann -> ShowS Source #

show :: Field ann -> String Source #

showList :: [Field ann] -> ShowS Source #

data Name ann Source #

A field name.

Invariant: ByteString is lower-case ASCII.

Constructors

Name !ann !FieldName 

Instances

Instances details
Functor Name # 
Instance details

Defined in Distribution.Fields.Field

Methods

fmap :: (a -> b) -> Name a -> Name b Source #

(<$) :: a -> Name b -> Name a Source #

Foldable Name # 
Instance details

Defined in Distribution.Fields.Field

Methods

fold :: Monoid m => Name m -> m Source #

foldMap :: Monoid m => (a -> m) -> Name a -> m Source #

foldMap' :: Monoid m => (a -> m) -> Name a -> m Source #

foldr :: (a -> b -> b) -> b -> Name a -> b Source #

foldr' :: (a -> b -> b) -> b -> Name a -> b Source #

foldl :: (b -> a -> b) -> b -> Name a -> b Source #

foldl' :: (b -> a -> b) -> b -> Name a -> b Source #

foldr1 :: (a -> a -> a) -> Name a -> a Source #

foldl1 :: (a -> a -> a) -> Name a -> a Source #

toList :: Name a -> [a] Source #

null :: Name a -> Bool Source #

length :: Name a -> Int Source #

elem :: Eq a => a -> Name a -> Bool Source #

maximum :: Ord a => Name a -> a Source #

minimum :: Ord a => Name a -> a Source #

sum :: Num a => Name a -> a Source #

product :: Num a => Name a -> a Source #

Traversable Name # 
Instance details

Defined in Distribution.Fields.Field

Methods

traverse :: Applicative f => (a -> f b) -> Name a -> f (Name b) Source #

sequenceA :: Applicative f => Name (f a) -> f (Name a) Source #

mapM :: Monad m => (a -> m b) -> Name a -> m (Name b) Source #

sequence :: Monad m => Name (m a) -> m (Name a) Source #

Eq ann => Eq (Name ann) # 
Instance details

Defined in Distribution.Fields.Field

Methods

(==) :: Name ann -> Name ann -> Bool #

(/=) :: Name ann -> Name ann -> Bool #

Show ann => Show (Name ann) # 
Instance details

Defined in Distribution.Fields.Field

Methods

showsPrec :: Int -> Name ann -> ShowS Source #

show :: Name ann -> String Source #

showList :: [Name ann] -> ShowS Source #

data FieldLine ann Source #

A line of text representing the value of a field from a Cabal file. A field may contain multiple lines.

Invariant: ByteString has no newlines.

Constructors

FieldLine !ann !ByteString 

Instances

Instances details
Functor FieldLine # 
Instance details

Defined in Distribution.Fields.Field

Methods

fmap :: (a -> b) -> FieldLine a -> FieldLine b Source #

(<$) :: a -> FieldLine b -> FieldLine a Source #

Foldable FieldLine # 
Instance details

Defined in Distribution.Fields.Field

Methods

fold :: Monoid m => FieldLine m -> m Source #

foldMap :: Monoid m => (a -> m) -> FieldLine a -> m Source #

foldMap' :: Monoid m => (a -> m) -> FieldLine a -> m Source #

foldr :: (a -> b -> b) -> b -> FieldLine a -> b Source #

foldr' :: (a -> b -> b) -> b -> FieldLine a -> b Source #

foldl :: (b -> a -> b) -> b -> FieldLine a -> b Source #

foldl' :: (b -> a -> b) -> b -> FieldLine a -> b Source #

foldr1 :: (a -> a -> a) -> FieldLine a -> a Source #

foldl1 :: (a -> a -> a) -> FieldLine a -> a Source #

toList :: FieldLine a -> [a] Source #

null :: FieldLine a -> Bool Source #

length :: FieldLine a -> Int Source #

elem :: Eq a => a -> FieldLine a -> Bool Source #

maximum :: Ord a => FieldLine a -> a Source #

minimum :: Ord a => FieldLine a -> a Source #

sum :: Num a => FieldLine a -> a Source #

product :: Num a => FieldLine a -> a Source #

Traversable FieldLine # 
Instance details

Defined in Distribution.Fields.Field

Methods

traverse :: Applicative f => (a -> f b) -> FieldLine a -> f (FieldLine b) Source #

sequenceA :: Applicative f => FieldLine (f a) -> f (FieldLine a) Source #

mapM :: Monad m => (a -> m b) -> FieldLine a -> m (FieldLine b) Source #

sequence :: Monad m => FieldLine (m a) -> m (FieldLine a) Source #

Eq ann => Eq (FieldLine ann) # 
Instance details

Defined in Distribution.Fields.Field

Methods

(==) :: FieldLine ann -> FieldLine ann -> Bool #

(/=) :: FieldLine ann -> FieldLine ann -> Bool #

Show ann => Show (FieldLine ann) # 
Instance details

Defined in Distribution.Fields.Field

data SectionArg ann Source #

Section arguments, e.g. name of the library

Constructors

SecArgName !ann !ByteString

identifier, or something which looks like number. Also many dot numbers, i.e. "7.6.3"

SecArgStr !ann !ByteString

quoted string

SecArgOther !ann !ByteString

everything else, mm. operators (e.g. in if-section conditionals)

Instances

Instances details
Functor SectionArg # 
Instance details

Defined in Distribution.Fields.Field

Methods

fmap :: (a -> b) -> SectionArg a -> SectionArg b Source #

(<$) :: a -> SectionArg b -> SectionArg a Source #

Foldable SectionArg # 
Instance details

Defined in Distribution.Fields.Field

Methods

fold :: Monoid m => SectionArg m -> m Source #

foldMap :: Monoid m => (a -> m) -> SectionArg a -> m Source #

foldMap' :: Monoid m => (a -> m) -> SectionArg a -> m Source #

foldr :: (a -> b -> b) -> b -> SectionArg a -> b Source #

foldr' :: (a -> b -> b) -> b -> SectionArg a -> b Source #

foldl :: (b -> a -> b) -> b -> SectionArg a -> b Source #

foldl' :: (b -> a -> b) -> b -> SectionArg a -> b Source #

foldr1 :: (a -> a -> a) -> SectionArg a -> a Source #

foldl1 :: (a -> a -> a) -> SectionArg a -> a Source #

toList :: SectionArg a -> [a] Source #

null :: SectionArg a -> Bool Source #

length :: SectionArg a -> Int Source #

elem :: Eq a => a -> SectionArg a -> Bool Source #

maximum :: Ord a => SectionArg a -> a Source #

minimum :: Ord a => SectionArg a -> a Source #

sum :: Num a => SectionArg a -> a Source #

product :: Num a => SectionArg a -> a Source #

Traversable SectionArg # 
Instance details

Defined in Distribution.Fields.Field

Methods

traverse :: Applicative f => (a -> f b) -> SectionArg a -> f (SectionArg b) Source #

sequenceA :: Applicative f => SectionArg (f a) -> f (SectionArg a) Source #

mapM :: Monad m => (a -> m b) -> SectionArg a -> m (SectionArg b) Source #

sequence :: Monad m => SectionArg (m a) -> m (SectionArg a) Source #

Eq ann => Eq (SectionArg ann) # 
Instance details

Defined in Distribution.Fields.Field

Methods

(==) :: SectionArg ann -> SectionArg ann -> Bool #

(/=) :: SectionArg ann -> SectionArg ann -> Bool #

Show ann => Show (SectionArg ann) # 
Instance details

Defined in Distribution.Fields.Field

Grammar and parsing

CabalStyleFile ::= SecElems

SecElems       ::= SecElem* '\\n'?
SecElem        ::= '\\n' SecElemLayout | SecElemBraces
SecElemLayout  ::= FieldLayout | FieldBraces | SectionLayout | SectionBraces
SecElemBraces  ::= FieldInline | FieldBraces |                 SectionBraces
FieldLayout    ::= name : line? ('\\n' line)*
FieldBraces    ::= name : '\\n'? '{' content '}'
FieldInline    ::= name : content
SectionLayout  ::= name arg* SecElems
SectionBraces  ::= name arg* '\\n'? '{' SecElems '}'

and the same thing but left factored...

SecElems              ::= SecElem*
SecElem               ::= '\\n' name SecElemLayout
                        |      name SecElemBraces
SecElemLayout         ::= :   FieldLayoutOrBraces
                        | arg*  SectionLayoutOrBraces
FieldLayoutOrBraces   ::= '\\n'? '{' content '}'
                        | line? ('\\n' line)*
SectionLayoutOrBraces ::= '\\n'? '{' SecElems '\\n'? '}'
                        | SecElems
SecElemBraces         ::= : FieldInlineOrBraces
                        | arg* '\\n'? '{' SecElems '\\n'? '}'
FieldInlineOrBraces   ::= '\\n'? '{' content '}'
                        | content

Note how we have several productions with the sequence:

'\\n'? '{'

That is, an optional newline (and indent) followed by a { token. In the SectionLayoutOrBraces case you can see that this makes it not fully left factored (because SecElems can start with a \n). Fully left factoring here would be ugly, and though we could use a lookahead of two tokens to resolve the alternatives, we can't conveniently use Parsec's try here to get a lookahead of only two. So instead we deal with this case in the lexer by making a line where the first non-space is { lex as just the { token, without the usual indent token. Then in the parser we can resolve everything with just one token of lookahead and so without using try.

readFields :: ByteString -> Either ParseError [Field Position] Source #

Parse cabal style ByteString into list of Fields, i.e. the cabal AST.

readFields' :: ByteString -> Either ParseError ([Field Position], [LexWarning]) Source #

Like readFields but also return lexer warnings