patternfly_yew/
validation.rs

1//! Validation
2
3#[derive(Clone, Debug)]
4pub struct ValidationContext<T> {
5    pub value: T,
6    pub initial: bool,
7}
8
9impl<T> From<T> for ValidationContext<T> {
10    fn from(value: T) -> Self {
11        ValidationContext {
12            value,
13            initial: false,
14        }
15    }
16}
17
18#[derive(Clone)]
19pub enum Validator<T, S> {
20    None,
21    Custom(std::rc::Rc<dyn Fn(ValidationContext<T>) -> S>),
22}
23
24impl<T, S> Validator<T, S> {
25    pub fn is_custom(&self) -> bool {
26        matches!(self, Self::Custom(_))
27    }
28
29    /// Convert into the context and run
30    pub fn run<C>(&self, ctx: C) -> Option<S>
31    where
32        C: Into<ValidationContext<T>>,
33    {
34        self.run_if(|| ctx.into())
35    }
36
37    /// Only convert when necessary, and run.
38    pub fn run_if<F>(&self, f: F) -> Option<S>
39    where
40        F: FnOnce() -> ValidationContext<T>,
41    {
42        match self {
43            Self::Custom(validator) => Some(validator(f())),
44            _ => None,
45        }
46    }
47
48    /// Run with the provided context.
49    pub fn run_ctx(&self, ctx: ValidationContext<T>) -> Option<S> {
50        match self {
51            Self::Custom(validator) => Some(validator(ctx)),
52            _ => None,
53        }
54    }
55}
56
57impl<T, S> Default for Validator<T, S> {
58    fn default() -> Self {
59        Self::None
60    }
61}
62
63/// Validators are equal if they are still None. Everything else is a change.
64impl<T, S> PartialEq for Validator<T, S> {
65    fn eq(&self, other: &Self) -> bool {
66        matches!((self, other), (Validator::None, Validator::None))
67    }
68}
69
70impl<F, T, S> From<F> for Validator<T, S>
71where
72    F: Fn(ValidationContext<T>) -> S + 'static,
73{
74    fn from(v: F) -> Self {
75        Self::Custom(std::rc::Rc::new(v))
76    }
77}
78
79pub trait IntoValidator<T, S> {
80    fn into_validator(self) -> Validator<T, S>;
81}
82
83impl<F, T, S> IntoValidator<T, S> for F
84where
85    F: Fn(ValidationContext<T>) -> S + 'static,
86{
87    fn into_validator(self) -> Validator<T, S> {
88        Validator::Custom(std::rc::Rc::new(self))
89    }
90}
patternfly_yew/validation.rs

patternfly_yew/
validation.rs
