Enum gix_attributes::StateRef

pub enum StateRef<'a> {
    Set,
    Unset,
    Value(ValueRef<'a>),
    Unspecified,
}

The state an attribute can be in, referencing the value.

Note that this doesn’t contain the name.

Variants

Set

The attribute is listed, or has the special value ‘true’

Unset

The attribute has the special value ‘false’, or was prefixed with a - sign.

Value(ValueRef<'a>)

The attribute is set to the given value, which followed the = sign. Note that values can be empty.

Unspecified

The attribute isn’t mentioned with a given path or is explicitly set to Unspecified using the ! sign.

Implementations

impl StateRef<'_>

Access

pub fn is_unspecified(&self) -> bool

Return true if the associated attribute was set to be unspecified using the !attr prefix or it wasn’t mentioned.

pub fn is_set(&self) -> bool

Return true if the associated attribute was set with attr. Note that this will also be true if a value is assigned.

pub fn is_unset(&self) -> bool

Return true if the associated attribute was set with -attr to specifically remove it.

pub fn as_bstr(&self) -> Option<&BStr>

Attempt to obtain the string value of this state, or return None if there is no such value.

impl<'a> StateRef<'a>

Initialization

pub fn from_bytes(input: &'a [u8]) -> Self

Keep input in one of our enums.

impl<'a> StateRef<'a>

Access

pub fn to_owned(self) -> State

Turn ourselves into our owned counterpart.

Trait Implementations

impl<'a> Clone for StateRef<'a>

fn clone(&self) -> StateRef<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for StateRef<'a>

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

Formats the value using the given formatter.

impl<'a> From<StateRef<'a>> for State

fn from(s: StateRef<'a>) -> Self

Converts to this type from the input type.

impl<'a> Hash for StateRef<'a>

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, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a> Ord for StateRef<'a>

fn cmp(&self, other: &StateRef<'a>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl<'a> PartialEq<StateRef<'a>> for StateRef<'a>

fn eq(&self, other: &StateRef<'a>) -> bool

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> PartialOrd<StateRef<'a>> for StateRef<'a>

fn partial_cmp(&self, other: &StateRef<'a>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'a> Copy for StateRef<'a>

impl<'a> Eq for StateRef<'a>

impl<'a> StructuralEq for StateRef<'a>

impl<'a> StructuralPartialEq for StateRef<'a>