Struct PredicateTool

pub struct PredicateTool<P> { /* private fields */ }

Tool that matches characters which satisfies the provided predicate.

A predicate is a function that accepts char and returns an Option: the None variand will be interpreted as a nonmatch, whereas the Some(d) variant will be interpreted as a match and the provided data d is stored in the returned View.

Implementations

impl<D, P: Fn(char) -> Option<D>> PredicateTool<P>

pub const fn new_map(predicate: P) -> Self

Create a new PredicateTool from a predicate.

impl<'a> PredicateTool<Box<dyn Fn(char) -> Option<char> + 'a>>

pub fn new_predicate<F: 'a + Fn(char) -> bool>(f: F) -> Self

Create a new PredicateTool from a function returning a bool.

A false result is interpreted as a None and a true result is converted to Some(c) with c is the matched character in the view.

Trait Implementations

impl<P: Clone> Clone for PredicateTool<P>

fn clone(&self) -> PredicateTool<P>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<P: Debug> Debug for PredicateTool<P>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a, F, D, P: Fn(char) -> Option<D>> ParseTool<'a, F> for PredicateTool<P>

type Error = ()

The error type is a match is not found

type Data = D

Additional data the match provides.

fn parse( &self, st: View<'a, (), F>, ) -> Result<View<'a, Self::Data, F>, Self::Error>

The main parsing algorithm.

fn assign_name<N: Clone + Display + Debug>( self, name: N, ) -> impl ParseTool<'a, F>

where Self: Sized, F: Debug + Display + Clone,

Assigns a name to the parsing tool, providing more useful error information.

impl<P: Copy> Copy for PredicateTool<P>