Codec.PNM.Parse

Lower-level functions for parsing PNM image format headers. Most users shouldn't need to import this module directly.

Documentation

data Parse p

The result of parsing.

Constructors

Wrong

Fields

parseMalformed :: ByteString

Empty

Parse

Fields

parseResult :: p

parseRawResult :: ByteString

parseRemainder :: ByteString

Instances

Eq p => Eq (Parse p)

Ord p => Ord (Parse p)

Show p => Show (Parse p)

rawChar :: ByteString -> Parse Word8

The next character.

char :: ByteString -> Parse Word8

The next non-comment character. Comments can occur in the middle of what might be considered tokens.

dropWhile :: (Word8 -> Bool) -> (ByteString -> Parse Word8) -> ByteString -> Parse ()

Drop input while a predicate holds.

takeUntil :: (Word8 -> Bool) -> (ByteString -> Parse Word8) -> ByteString -> Parse ByteString

Take input until a predicate holds.

token :: ByteString -> Parse ByteString

Parse a token.

string :: ByteString -> ByteString -> Parse ()

Parse a fixed string.

number :: ByteString -> Parse Integer

Parse a positive decimal number.

decimal :: ByteString -> Maybe Integer

Number conversion.

oneSpace :: ByteString -> Parse ()

Parse a single space.

str :: String -> ByteString

Convert from a string. Crashes hard on non-ASCII input.

isSpace, isEndComment, isStartComment, isDigit :: Word8 -> Bool

Character classes.

ht, space, cr, ff, vt, lf :: Word8

White space characters.

hash :: Word8

Comment start character.

d0, d9, d8, d7, d6, d5, d4, d3, d2, d1 :: Word8

Decimal digit characters.

(++) :: ByteString -> ByteString -> ByteString

Alias for append.