Enum lwb_parser::sources::character_class::CharacterClass

pub enum CharacterClass {
    RangeInclusive {
        from: char,
        to: char,
    },
    Range {
        from: char,
        to: char,
    },
    Contained(Vec<char>),
    Choice(Vec<CharacterClass>),
    Not(Box<CharacterClass>),
    Nothing,
}

Represent a class of characters like in a regex such as [a-z] or ¹

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1.  ↩

Variants

RangeInclusive

Fields

from: char

to: char

Inclusive range. Both from and to are inclusive

Range

Fields

from: char

to: char

Exclusive range. from is inclusive but to is exclusive

Contained(Vec<char>)

all characters in the vec are in the character class.

Choice(Vec<CharacterClass>)

True when one of the character class parts is true

Not(Box<CharacterClass>)

inverts the outcome of the embedded character class

Nothing

Always false. Use Not(Nothing) for always true.

Implementations

impl CharacterClass

pub fn contains(&self, c: char) -> bool

Contains returns true when a character is included in this character class.

let c = CharacterClass::from('a'..='z');
assert!(c.contains('a'));
assert!(c.contains('z'));
assert!(!c.contains('0'));

// exclusive range so does not contain 'z'
let c = CharacterClass::from('a'..'z');
assert!(c.contains('a'));
assert!(c.contains('y'));
assert!(!c.contains('z'));
assert!(!c.contains('0'));

// always return false
let c = CharacterClass::Nothing;
assert!(!c.contains('a'));
assert!(!c.contains('0'));

// always return true
let c = CharacterClass::Nothing.invert();
assert!(c.contains('a'));
assert!(c.contains('0'));

pub const fn all_in_vec(chars: Vec<char>) -> Self

returns a character class that contains all elements of the slice.

pub fn invert(self) -> Self

Invert this character class. The new class accepts any character not in the original character class

pub fn combine(self, other: CharacterClass) -> CharacterClass

Combine two character classes such that the result contains all characters from either of the two character class sets.

use lwb_parser::sources::character_class::CharacterClass;

let a = CharacterClass::from('a'..'z');
let b = CharacterClass::from('0'..'9');
assert!(a.contains('a'));
assert!(!a.contains('0'));
assert!(!b.contains('a'));
assert!(b.contains('0'));

let c = a.combine(b);
assert!(c.contains('a'));
assert!(c.contains('0'));

Trait Implementations

impl Clone for CharacterClass

fn clone(&self) -> CharacterClass

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CharacterClass

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for CharacterClass

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
    __D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.

impl Display for CharacterClass

This display trait is very heavily improvised, should be improved in the future!

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

Formats the value using the given formatter.

impl<'a> From<&'a str> for CharacterClass

fn from(s: &'a str) -> Self

Converts to this type from the input type.

impl From<&[char]> for CharacterClass

fn from(s: &[char]) -> Self

Converts to this type from the input type.

impl From<Range<char>> for CharacterClass

fn from(r: Range<char>) -> Self

Converts to this type from the input type.

impl From<RangeInclusive<char>> for CharacterClass

fn from(r: RangeInclusive<char>) -> Self

Converts to this type from the input type.

impl From<String> for CharacterClass

fn from(s: String) -> Self

Converts to this type from the input type.

impl From<Vec<char, Global>> for CharacterClass

fn from(s: Vec<char>) -> Self

Converts to this type from the input type.

impl From<char> for CharacterClass

fn from(c: char) -> Self

Converts to this type from the input type.

impl Hash for CharacterClass

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl PartialEq<CharacterClass> for CharacterClass

fn eq(&self, other: &CharacterClass) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &CharacterClass) -> bool

This method tests for !=.

impl Serialize for CharacterClass

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
    __S: Serializer, 

Serialize this value into the given Serde serializer.

impl Eq for CharacterClass

impl StructuralEq for CharacterClass

impl StructuralPartialEq for CharacterClass