Struct Attribute 

pub struct Attribute { /* private fields */ }

This struct constains the property flags as describen in the ECMAScript specification.

It contains the following flags:

• [[Writable]] (WRITABLE) - If false, attempts by ECMAScript code to change the property’s [[Value]] attribute using [[Set]] will not succeed.
• [[Enumerable]] (ENUMERABLE) - If the property will be enumerated by a for-in enumeration.
• [[Configurable]] (CONFIGURABLE) - If false, attempts to delete the property, change the property to be an accessor property, or change its attributes (other than [[Value]], or changing [[Writable]] to false) will fail.

Implementations

impl Attribute

pub const WRITABLE: Self

The Writable attribute decides whether the value associated with the property can be changed or not, from its initial value.

pub const ENUMERABLE: Self

If the property can be enumerated by a for-in loop.

pub const CONFIGURABLE: Self

If the property descriptor can be changed later.

pub const READONLY: Self

The property is not writable.

pub const NON_ENUMERABLE: Self

The property can not be enumerated in a for-in loop.

pub const PERMANENT: Self

The property descriptor cannot be changed.

pub const fn empty() -> Self

Returns an empty set of flags.

pub const fn all() -> Self

Returns the set containing all flags.

pub const fn bits(&self) -> u8

Returns the raw value of the flags currently stored.

pub const fn from_bits(bits: u8) -> Option<Self>

Convert from underlying bit representation, unless that representation contains bits that do not correspond to a flag.

pub const fn from_bits_truncate(bits: u8) -> Self

Convert from underlying bit representation, dropping any bits that do not correspond to flags.

pub const unsafe fn from_bits_unchecked(bits: u8) -> Self

Convert from underlying bit representation, preserving all bits (even those not corresponding to a defined flag).

Safety

The caller of the bitflags! macro can chose to allow or disallow extra bits for their bitflags type.

The caller of from_bits_unchecked() has to ensure that all bits correspond to a defined flag or that extra bits are valid for this bitflags type.

pub const fn is_empty(&self) -> bool

Returns true if no flags are currently stored.

pub const fn is_all(&self) -> bool

Returns true if all flags are currently set.

pub const fn intersects(&self, other: Self) -> bool

Returns true if there are flags common to both self and other.

pub const fn contains(&self, other: Self) -> bool

Returns true if all of the flags in other are contained within self.

pub fn insert(&mut self, other: Self)

Inserts the specified flags in-place.

pub fn remove(&mut self, other: Self)

Removes the specified flags in-place.

pub fn toggle(&mut self, other: Self)

Toggles the specified flags in-place.

pub fn set(&mut self, other: Self, value: bool)

Inserts or removes the specified flags depending on the passed value.

pub const fn intersection(self, other: Self) -> Self

Returns the intersection between the flags in self and other.

Specifically, the returned set contains only the flags which are present in both self and other.

This is equivalent to using the & operator (e.g. ops::BitAnd), as in flags & other.

pub const fn union(self, other: Self) -> Self

Returns the union of between the flags in self and other.

Specifically, the returned set contains all flags which are present in either self or other, including any which are present in both (see Self::symmetric_difference if that is undesirable).

This is equivalent to using the | operator (e.g. ops::BitOr), as in flags | other.

pub const fn difference(self, other: Self) -> Self

Returns the difference between the flags in self and other.

Specifically, the returned set contains all flags present in self, except for the ones present in other.

It is also conceptually equivalent to the “bit-clear” operation: flags & !other (and this syntax is also supported).

This is equivalent to using the - operator (e.g. ops::Sub), as in flags - other.

pub const fn symmetric_difference(self, other: Self) -> Self

Returns the symmetric difference between the flags in self and other.

Specifically, the returned set contains the flags present which are present in self or other, but that are not present in both. Equivalently, it contains the flags present in exactly one of the sets self and other.

This is equivalent to using the ^ operator (e.g. ops::BitXor), as in flags ^ other.

pub const fn complement(self) -> Self

Returns the complement of this set of flags.

Specifically, the returned set contains all the flags which are not set in self, but which are allowed for this type.

Alternatively, it can be thought of as the set difference between Self::all() and self (e.g. Self::all() - self)

This is equivalent to using the ! operator (e.g. ops::Not), as in !flags.

impl Attribute

pub fn clear(&mut self)

Clear all flags.

pub fn set_writable(&mut self, value: bool)

Sets the writable flag.

pub fn writable(self) -> bool

Gets the writable flag.

pub fn set_enumerable(&mut self, value: bool)

Sets the enumerable flag.

pub fn enumerable(self) -> bool

Gets the enumerable flag.

pub fn set_configurable(&mut self, value: bool)

Sets the configurable flag.

pub fn configurable(self) -> bool

Gets the configurable flag.

Trait Implementations

impl Binary for Attribute

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

Formats the value using the given formatter.

impl BitAnd for Attribute

fn bitand(self, other: Self) -> Self

Returns the intersection between the two sets of flags.

type Output = Attribute

The resulting type after applying the & operator.

impl BitAndAssign for Attribute

fn bitand_assign(&mut self, other: Self)

Disables all flags disabled in the set.

impl BitOr for Attribute

fn bitor(self, other: Attribute) -> Self

Returns the union of the two sets of flags.

type Output = Attribute

The resulting type after applying the | operator.

impl BitOrAssign for Attribute

fn bitor_assign(&mut self, other: Self)

Adds the set of flags.

impl BitXor for Attribute

fn bitxor(self, other: Self) -> Self

Returns the left flags, but with all the right flags toggled.

type Output = Attribute

The resulting type after applying the ^ operator.

impl BitXorAssign for Attribute

fn bitxor_assign(&mut self, other: Self)

Toggles the set of flags.

impl Clone for Attribute

fn clone(&self) -> Attribute

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Attribute

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

Formats the value using the given formatter.

impl Default for Attribute

fn default() -> Self

Returns the default flags according to the ECMAScript specification.

impl Extend<Attribute> for Attribute

fn extend<T: IntoIterator<Item = Self>>(&mut self, iterator: T)

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl Finalize for Attribute

fn finalize(&self)

impl FromIterator<Attribute> for Attribute

fn from_iter<T: IntoIterator<Item = Self>>(iterator: T) -> Self

Creates a value from an iterator.

impl Hash for Attribute

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 LowerHex for Attribute

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

Formats the value using the given formatter.

impl Not for Attribute

fn not(self) -> Self

Returns the complement of this set of flags.

type Output = Attribute

The resulting type after applying the ! operator.

impl Octal for Attribute

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

Formats the value using the given formatter.

impl Ord for Attribute

fn cmp(&self, other: &Attribute) -> Ordering

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Attribute

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for Attribute

fn partial_cmp(&self, other: &Attribute) -> Option<Ordering>

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl Sub for Attribute

fn sub(self, other: Self) -> Self

Returns the set difference of the two sets of flags.

type Output = Attribute

The resulting type after applying the - operator.

impl SubAssign for Attribute

fn sub_assign(&mut self, other: Self)

Disables all flags enabled in the set.

impl Trace for Attribute

unsafe fn trace(&self)

Marks all contained Gcs.

unsafe fn root(&self)

Increments the root-count of all contained Gcs.

unsafe fn unroot(&self)

Decrements the root-count of all contained Gcs.

fn finalize_glue(&self)

Runs Finalize::finalize() on this object and all contained subobjects

impl UpperHex for Attribute

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

Formats the value using the given formatter.

impl Copy for Attribute

impl Eq for Attribute

impl StructuralPartialEq for Attribute