Trait predicates::Predicate

pub trait Predicate<Item>: PredicateReflection where
    Item: ?Sized, {
    pub fn eval(&self, variable: &Item) -> bool;

    pub fn find_case(
        &'a self, 
        expected: bool, 
        variable: &Item
    ) -> Option<Case<'a>> { ... }
}

Trait for generically evaluating a type against a dynamically created predicate function.

The exact meaning of eval depends on the situation, but will usually mean that the evaluated item is in some sort of pre-defined set. This is different from Ord and Eq in that an item will almost never be the same type as the implementing Predicate type.

Required methods

pub fn eval(&self, variable: &Item) -> bool

Execute this Predicate against variable, returning the resulting boolean.

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Provided methods

pub fn find_case(&'a self, expected: bool, variable: &Item) -> Option<Case<'a>>

Find a case that proves this predicate as expected when run against variable.

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Implementors

impl Predicate<f64> for IsClosePredicate

fn eval(&self, variable: &f64) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &f64) -> Option<Case<'a>>

impl Predicate<[u8]> for BinaryFilePredicate

fn eval(&self, actual: &[u8]) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &[u8]) -> Option<Case<'a>>

impl Predicate<str> for StrFilePredicate

fn eval(&self, actual: &str) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<Case<'a>>

impl Predicate<str> for ContainsPredicate

fn eval(&self, variable: &str) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<Case<'a>>

impl Predicate<str> for DifferencePredicate

fn eval(&self, edit: &str) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<Case<'a>>

impl Predicate<str> for EndsWithPredicate

fn eval(&self, variable: &str) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<Case<'a>>

impl Predicate<str> for IsEmptyPredicate

fn eval(&self, variable: &str) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<Case<'a>>

impl Predicate<str> for MatchesPredicate

fn eval(&self, variable: &str) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<Case<'a>>

impl Predicate<str> for RegexPredicate

fn eval(&self, variable: &str) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<Case<'a>>

impl Predicate<str> for StartsWithPredicate

fn eval(&self, variable: &str) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<Case<'a>>

impl Predicate<Path> for BinaryFilePredicate

fn eval(&self, path: &Path) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Path) -> Option<Case<'a>>

impl Predicate<Path> for ExistencePredicate

fn eval(&self, path: &Path) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Path) -> Option<Case<'a>>

impl Predicate<Path> for FileTypePredicate

fn eval(&self, path: &Path) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Path) -> Option<Case<'a>>

impl Predicate<Path> for StrFilePredicate

fn eval(&self, path: &Path) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Path) -> Option<Case<'a>>

impl<'a, T: ?Sized> Predicate<T> for HashableInPredicate<&'a T> where
    T: Hash + Eq + Debug, 

fn eval(&self, variable: &T) -> bool

fn find_case<'b>(&'b self, expected: bool, variable: &T) -> Option<Case<'b>>

impl<'a, T: ?Sized> Predicate<T> for InPredicate<&'a T> where
    T: PartialEq + Debug, 

fn eval(&self, variable: &T) -> bool

fn find_case<'b>(&'b self, expected: bool, variable: &T) -> Option<Case<'b>>

impl<'a, T: ?Sized> Predicate<T> for OrdInPredicate<&'a T> where
    T: Ord + Debug, 

fn eval(&self, variable: &T) -> bool

fn find_case<'b>(&'b self, expected: bool, variable: &T) -> Option<Case<'b>>

impl<'a, T: ?Sized> Predicate<T> for EqPredicate<&'a T> where
    T: Debug + PartialEq, 

fn eval(&self, variable: &T) -> bool

fn find_case<'b>(&'b self, expected: bool, variable: &T) -> Option<Case<'b>>

impl<'a, T: ?Sized> Predicate<T> for OrdPredicate<&'a T> where
    T: Debug + PartialOrd, 

fn eval(&self, variable: &T) -> bool

fn find_case<'b>(&'b self, expected: bool, variable: &T) -> Option<Case<'b>>

impl<F, T> Predicate<T> for FnPredicate<F, T> where
    F: Fn(&T) -> bool,
    T: ?Sized, 

fn eval(&self, variable: &T) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &T) -> Option<Case<'a>>

impl<Item> Predicate<Item> for BoxPredicate<Item> where
    Item: ?Sized, 

fn eval(&self, variable: &Item) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Item) -> Option<Case<'a>>

impl<Item: ?Sized> Predicate<Item> for BooleanPredicate

fn eval(&self, _variable: &Item) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Item) -> Option<Case<'a>>

impl<M1, M2, Item> Predicate<Item> for AndPredicate<M1, M2, Item> where
    M1: Predicate<Item>,
    M2: Predicate<Item>,
    Item: ?Sized, 

fn eval(&self, item: &Item) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Item) -> Option<Case<'a>>

impl<M1, M2, Item> Predicate<Item> for OrPredicate<M1, M2, Item> where
    M1: Predicate<Item>,
    M2: Predicate<Item>,
    Item: ?Sized, 

fn eval(&self, item: &Item) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Item) -> Option<Case<'a>>

impl<M, Item> Predicate<Item> for NotPredicate<M, Item> where
    M: Predicate<Item>,
    Item: ?Sized, 

fn eval(&self, item: &Item) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Item) -> Option<Case<'a>>

impl<M, Item> Predicate<Item> for NamePredicate<M, Item> where
    M: Predicate<Item>,
    Item: ?Sized, 

fn eval(&self, item: &Item) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Item) -> Option<Case<'a>>

impl<P> Predicate<[u8]> for Utf8Predicate<P> where
    P: Predicate<str>, 

fn eval(&self, variable: &[u8]) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &[u8]) -> Option<Case<'a>>

impl<P> Predicate<str> for NormalizedPredicate<P> where
    P: Predicate<str>, 

fn eval(&self, variable: &str) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<Case<'a>>

impl<P> Predicate<str> for TrimPredicate<P> where
    P: Predicate<str>, 

fn eval(&self, variable: &str) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<Case<'a>>

impl<P> Predicate<OsStr> for Utf8Predicate<P> where
    P: Predicate<str>, 

fn eval(&self, variable: &OsStr) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &OsStr) -> Option<Case<'a>>

impl<P> Predicate<Path> for FileContentPredicate<P> where
    P: Predicate<[u8]>, 

fn eval(&self, path: &Path) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &Path) -> Option<Case<'a>>

impl<T> Predicate<T> for HashableInPredicate<T> where
    T: Hash + Eq + Debug, 

fn eval(&self, variable: &T) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &T) -> Option<Case<'a>>

impl<T> Predicate<T> for InPredicate<T> where
    T: PartialEq + Debug, 

fn eval(&self, variable: &T) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &T) -> Option<Case<'a>>

impl<T> Predicate<T> for OrdInPredicate<T> where
    T: Ord + Debug, 

fn eval(&self, variable: &T) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &T) -> Option<Case<'a>>

impl<T> Predicate<T> for EqPredicate<T> where
    T: Debug + PartialEq, 

fn eval(&self, variable: &T) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &T) -> Option<Case<'a>>

impl<T> Predicate<T> for OrdPredicate<T> where
    T: Debug + PartialOrd, 

fn eval(&self, variable: &T) -> bool

fn find_case<'a>(&'a self, expected: bool, variable: &T) -> Option<Case<'a>>

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