Struct rowan::TextSize

pub struct TextSize { /* fields omitted */ }

A measure of text length. Also, equivalently, an index into text.

This is a UTF-8 bytes offset stored as u32, but most clients should treat it as an opaque measure.

For cases that need to escape TextSize and return to working directly with primitive integers, TextSize can be converted losslessly to/from u32 via From conversions as well as losslessly be converted Into usize. The usize -> TextSize direction can be done via TryFrom.

These escape hatches are primarily required for unit testing and when converting from UTF-8 size to another coordinate space, such as UTF-16.

Implementations

impl TextSize

pub fn of<T>(text: T) -> TextSize where
    T: TextLen, 

The text size of some primitive text-like object.

Accepts char, &str, and &String.

Examples

let char_size = TextSize::of('🦀');
assert_eq!(char_size, TextSize::from(4));

let str_size = TextSize::of("rust-analyzer");
assert_eq!(str_size, TextSize::from(13));

impl TextSize

Methods to act like a primitive integer type, where reasonably applicable.

pub fn checked_add(self, rhs: TextSize) -> Option<TextSize>

Checked addition. Returns None if overflow occurred.

pub fn checked_sub(self, rhs: TextSize) -> Option<TextSize>

Checked subtraction. Returns None if overflow occurred.

Trait Implementations

impl<'_> Add<&'_ TextSize> for TextSize

type Output = TextSize

The resulting type after applying the + operator.

pub fn add(self, other: &TextSize) -> TextSize

Performs the + operation.

impl<'_> Add<&'_ TextSize> for TextRange

type Output = TextRange

The resulting type after applying the + operator.

pub fn add(self, other: &TextSize) -> TextRange

Performs the + operation.

impl<'_, T> Add<T> for &'_ TextSize where
    TextSize: Add<T>,
    <TextSize as Add<T>>::Output == TextSize, 

type Output = TextSize

The resulting type after applying the + operator.

pub fn add(self, other: T) -> TextSize

Performs the + operation.

impl Add<TextSize> for TextSize

type Output = TextSize

The resulting type after applying the + operator.

pub fn add(self, other: TextSize) -> TextSize

Performs the + operation.

impl Add<TextSize> for TextRange

type Output = TextRange

The resulting type after applying the + operator.

pub fn add(self, offset: TextSize) -> TextRange

Performs the + operation.

impl<A> AddAssign<A> for TextSize where
    TextSize: Add<A>,
    <TextSize as Add<A>>::Output == TextSize, 

pub fn add_assign(&mut self, rhs: A)

Performs the += operation.

impl Clone for TextSize

pub fn clone(&self) -> TextSize

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for TextSize

impl Debug for TextSize

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

Formats the value using the given formatter.

impl Default for TextSize

pub fn default() -> TextSize

Returns the "default value" for a type.

impl Eq for TextSize

impl From<u32> for TextSize

pub fn from(raw: u32) -> TextSize

Performs the conversion.

impl Hash for TextSize

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

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 Ord for TextSize

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

This method returns an Ordering between self and other.

#[must_use]fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]fn clamp(self, min: Self, max: Self) -> Self

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

Restrict a value to a certain interval.

impl PartialEq<TextSize> for TextSize

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

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

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

This method tests for !=.

impl PartialOrd<TextSize> for TextSize

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

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

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

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

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

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

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

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

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

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

impl RangeBounds<TextSize> for TextRange

pub fn start_bound(&self) -> Bound<&TextSize>

Start index bound.

pub fn end_bound(&self) -> Bound<&TextSize>

End index bound.

fn assert_len(self, len: usize) -> Range<usize> where
    Self: RangeBounds<usize>, 

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

Performs bounds-checking of this range.

fn contains<U>(&self, item: &U) -> bool where
    T: PartialOrd<U>,
    U: PartialOrd<T> + ?Sized, 

Returns true if item is contained in the range.

impl StructuralEq for TextSize

impl StructuralPartialEq for TextSize

impl<'_> Sub<&'_ TextSize> for TextSize

type Output = TextSize

The resulting type after applying the - operator.

pub fn sub(self, other: &TextSize) -> TextSize

Performs the - operation.

impl<'_> Sub<&'_ TextSize> for TextRange

type Output = TextRange

The resulting type after applying the - operator.

pub fn sub(self, other: &TextSize) -> TextRange

Performs the - operation.

impl<'_, T> Sub<T> for &'_ TextSize where
    TextSize: Sub<T>,
    <TextSize as Sub<T>>::Output == TextSize, 

type Output = TextSize

The resulting type after applying the - operator.

pub fn sub(self, other: T) -> TextSize

Performs the - operation.

impl Sub<TextSize> for TextRange

type Output = TextRange

The resulting type after applying the - operator.

pub fn sub(self, offset: TextSize) -> TextRange

Performs the - operation.

impl Sub<TextSize> for TextSize

type Output = TextSize

The resulting type after applying the - operator.

pub fn sub(self, other: TextSize) -> TextSize

Performs the - operation.

impl<S> SubAssign<S> for TextSize where
    TextSize: Sub<S>,
    <TextSize as Sub<S>>::Output == TextSize, 

pub fn sub_assign(&mut self, rhs: S)

Performs the -= operation.

impl<A> Sum<A> for TextSize where
    TextSize: Add<A>,
    <TextSize as Add<A>>::Output == TextSize, 

pub fn sum<I>(iter: I) -> TextSize where
    I: Iterator<Item = A>, 

Method which takes an iterator and generates Self from the elements by "summing up" the items.

impl TryFrom<usize> for TextSize

type Error = TryFromIntError

The type returned in the event of a conversion error.

pub fn try_from(value: usize) -> Result<TextSize, TryFromIntError>

Performs the conversion.