Trait Expr

pub trait Expr: LSend {
    // Required method
    fn run(
        &self,
        cursor: usize,
        tokens: &[Token],
        source: &[char],
    ) -> Option<Span>;
}

A common problem in Harper is that we need to identify tokens that fulfil certain criterion. An Expr is a way to express whether a certain set of tokens fulfil that criteria. When supplied a specific position in a token stream, the job of an Expr is to determine the window of tokens (including the cursor itself) that fulfils whatever criteria the author desires. It is then the job of another system to identify portions of documents that fulfil this criteria.

Required Methods

fn run(&self, cursor: usize, tokens: &[Token], source: &[char]) -> Option<Span>

Implementations on Foreign Types

impl<E> Expr for Arc<E>

where E: Expr,

fn run(&self, cursor: usize, tokens: &[Token], source: &[char]) -> Option<Span>

Implementors

impl Expr for All

impl Expr for FirstMatchOf

impl Expr for FixedPhrase

impl Expr for LongestMatchOf

impl Expr for MergeableWords

impl Expr for Optional

impl Expr for ReflexivePronoun

impl Expr for Repeating

impl Expr for SequenceExpr

impl Expr for SimilarToPhrase

impl Expr for SpaceOrHyphen

impl Expr for SpelledNumberExpr

impl Expr for TimeUnitExpr

impl<E> Expr for Rc<E>

where E: Expr,

impl<E> Expr for WordExprGroup<E>

where E: Expr,

impl<S> Expr for S

where S: Step + ?Sized,

impl<T> Expr for ExprMap<T>

where T: LSend,