Annotations.BoundsParser

A Parsec parser type that parses Symbols and keeps track of the position within the input stream. Unlike Parsec's default position tracking, this parser keeps track of the range of whitespace between two tokens.

Symbols

class Symbol s where

Symbols form input for parsers. Minimal complete definition: unparse.

Minimal complete definition

unparse

Methods

unparse :: s -> String

Unparses a symbol, converting it back to text.

symbolSize :: s -> Int

Yields the size of a symbol. Default implementation is length . unparse.

Instances

Symbol s => Symbol [s]

Methods

unparse :: [s] -> String

symbolSize :: [s] -> Int

collapse :: Symbol s => (s -> Bool) -> [s] -> [(s, Bounds)]

Given a predicate that tells what tokens to discard, keeps only the meaningful tokens and couples them with position information.

Parsing

type P s = ParsecT [(s, Bounds)] Range

A parser that works on symbols coupled with token information. The state maintains the current position in the stream. This position is the range of whitespace between two tokens.

satisfy :: (Monad m, Symbol s) => (s -> Bool) -> P s m s

Recognise a symbol matching a predicate.

pToken :: (Monad m, Symbol s, Eq s) => s -> P s m s

Recognise a specific symbol.

getPos :: Monad m => P s m Range

Yield the current position in the input.