Struct RuleBuilder 

pub struct RuleBuilder<T> { /* private fields */ }

Chainable rule builder for form fields.

Implementations

impl<T: 'static> RuleBuilder<T>

pub fn new() -> Self

Creates a new empty RuleBuilder.

pub fn custom<F>(self, f: F) -> Self

where F: Fn(&T) -> Result<(), String> + 'static,

Appends a custom rule callback returning Ok(()) or Err(String).

pub fn build(self) -> Vec<ValidationRule<T>>

Finalizes and returns the vector of validation rules.

impl RuleBuilder<String>

pub fn required(self, err_msg: &str) -> Self

Asserts that a string field is not empty or whitespace only.

pub fn email(self, err_msg: &str) -> Self

Validates an email address via RFC-compliant RegExp or pattern match.

pub fn min_length(self, min: usize, err_msg: &str) -> Self

Enforces a minimum character length.

pub fn max_length(self, max: usize, err_msg: &str) -> Self

Enforces a maximum character length.

pub fn numeric_range(self, min: f64, max: f64, err_msg: &str) -> Self

Validates a numeric range parsed from string.

pub fn regex(self, pattern: &str, err_msg: &str) -> Self

Validates against a custom Regular Expression pattern string.

Trait Implementations

impl Default for RuleBuilder<String>

fn default() -> Self

Returns the “default value” for a type.