Struct LengthRule 

pub struct LengthRule {
    pub min: Option<usize>,
    pub max: Option<usize>,
    pub equal: Option<usize>,
    pub mode: LengthMode,
    pub message: Option<String>,
}

String/collection length validation rule.

Example

use skp_validator_rules::string::length::LengthRule;
use skp_validator_core::{Rule, ValidationContext};

let rule = LengthRule::new().min(3).max(50);
let ctx = ValidationContext::default();

assert!(rule.validate("hello", &ctx).is_ok());
assert!(rule.validate("ab", &ctx).is_err()); // Too short

Fields

min: Option<usize>

Minimum length (inclusive)

max: Option<usize>

Maximum length (inclusive)

equal: Option<usize>

Exact length (if set, min/max are ignored)

mode: LengthMode

Length calculation mode

message: Option<String>

Custom error message

Implementations

impl LengthRule

pub fn new() -> Self

Create a new length rule.

pub fn min(self, min: usize) -> Self

Set minimum length.

pub fn max(self, max: usize) -> Self

Set maximum length.

pub fn equal(self, len: usize) -> Self

Set exact length.

pub fn mode(self, mode: LengthMode) -> Self

Set length calculation mode.

pub fn message(self, msg: impl Into<String>) -> Self

Set custom error message.

Trait Implementations

impl Clone for LengthRule

fn clone(&self) -> LengthRule

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LengthRule

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

Formats the value using the given formatter.

impl Default for LengthRule

fn default() -> Self

Returns the “default value” for a type.

impl Rule<String> for LengthRule

fn validate( &self, value: &String, ctx: &ValidationContext, ) -> ValidationResult<()>

Validate the value.

fn name(&self) -> &'static str

Get the rule name for error reporting.

fn default_message(&self) -> String

Get the default error message.

fn validate_at( &self, value: &T, path: &FieldPath, ctx: &ValidationContext, ) -> Result<(), ValidationErrors>

Validate the value with a field path for error reporting.

fn error_code(&self) -> String

Get the error code.

fn is_transform(&self) -> bool

Check if this rule is a transformation (not validation).

impl<T> Rule<Vec<T>> for LengthRule

fn validate( &self, value: &Vec<T>, _ctx: &ValidationContext, ) -> ValidationResult<()>

Validate the value.

fn name(&self) -> &'static str

Get the rule name for error reporting.

fn default_message(&self) -> String

Get the default error message.

fn validate_at( &self, value: &T, path: &FieldPath, ctx: &ValidationContext, ) -> Result<(), ValidationErrors>

Validate the value with a field path for error reporting.

fn error_code(&self) -> String

Get the error code.

fn is_transform(&self) -> bool

Check if this rule is a transformation (not validation).

impl Rule<str> for LengthRule

fn validate( &self, value: &str, _ctx: &ValidationContext, ) -> ValidationResult<()>

Validate the value.

fn name(&self) -> &'static str

Get the rule name for error reporting.

fn default_message(&self) -> String

Get the default error message.

fn validate_at( &self, value: &T, path: &FieldPath, ctx: &ValidationContext, ) -> Result<(), ValidationErrors>

Validate the value with a field path for error reporting.

fn error_code(&self) -> String

Get the error code.

fn is_transform(&self) -> bool

Check if this rule is a transformation (not validation).