Struct TextBuffer 

pub struct TextBuffer { /* private fields */ }

A UTF-8 text buffer with UTF-16-indexed access.

All public offsets are UTF-16 code units, matching the JavaScript side.

Implementations

impl TextBuffer

pub fn new(text: impl Into<String>) -> Self

pub fn as_str(&self) -> &str

pub fn len16(&self) -> usize

Length in UTF-16 code units, matching JS String.prototype.length.

pub fn char_count(&self) -> usize

Length in Unicode scalar values. Differs from Self::len16 wherever a character outside the BMP occurs.

pub fn is_empty(&self) -> bool

pub fn slice16(&self, start: usize, end: usize) -> Result<String, FcError>

Extracts a substring using UTF-16 offsets.

pub fn replace16( &mut self, start: usize, end: usize, replacement: &str, ) -> Result<Range16, FcError>

Replaces a UTF-16 range, returning the range the inserted text now occupies so a caller can place the caret after an edit without recomputing it.

pub fn lines16(&self) -> Vec<Range16>

Splits into lines, reporting each line’s range in UTF-16 units.

Terminators are not included, and a trailing newline produces a final empty line – the behaviour an editor needs so the caret can sit on the line after a final newline.

pub fn line_at(&self, offset: usize) -> Result<Range16, FcError>

Returns the UTF-16 range of the line containing offset.

pub fn count16(&self, start: usize, end: usize) -> Result<usize, FcError>

Counts characters in a UTF-16 range, for the character counts a UI displays – counting bytes or code units there would be visibly wrong.

impl TextBuffer

pub fn js_from(text: String) -> TextBuffer

Constructs a buffer from JS.

constructor rather than a static factory: it makes the type instantiable from JavaScript, which wasm_bindgen otherwise refuses because it only generates ABI glue for values it can move across the boundary.

pub fn text(&self) -> String

pub fn js_len16(&self) -> usize

pub fn js_char_count(&self) -> usize

pub fn js_lines16(&self) -> Vec<u32>

Returns flat [start, end, ...] coordinates, one pair per line.

pub fn js_slice16(&self, start: usize, end: usize) -> Result<String, JsValue>

pub fn js_replace16( &mut self, start: usize, end: usize, replacement: &str, ) -> Result<Vec<u32>, JsValue>

Replaces a range and returns the [start, end] the inserted text now occupies, so the caller can place the caret without recomputing it.

pub fn js_line_at(&self, offset: usize) -> Result<Vec<u32>, JsValue>

pub fn js_count_chars(&self, start: usize, end: usize) -> Result<usize, JsValue>

Counts characters, not bytes or UTF-16 units, in a range.

Trait Implementations

impl Clone for TextBuffer

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TextBuffer

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

Formats the value using the given formatter.

impl Default for TextBuffer

fn default() -> Self

Returns the “default value” for a type.

impl From<TextBuffer> for JsValue

fn from(value: TextBuffer) -> Self

Converts to this type from the input type.

impl FromWasmAbi for TextBuffer

type Abi = u32

The Wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: u32) -> Self

Recover a Self from Self::Abi.

impl IntoWasmAbi for TextBuffer

type Abi = u32

The Wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> u32

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl LongRefFromWasmAbi for TextBuffer

type Abi = u32

Same as RefFromWasmAbi::Abi

type Anchor = RcRef<TextBuffer>

Same as RefFromWasmAbi::Anchor

unsafe fn long_ref_from_abi(js: Self::Abi) -> Self::Anchor

Same as RefFromWasmAbi::ref_from_abi

impl OptionFromWasmAbi for TextBuffer

fn is_none(abi: &Self::Abi) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionIntoWasmAbi for TextBuffer

fn none() -> Self::Abi

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl RefFromWasmAbi for TextBuffer

type Abi = u32

The Wasm ABI type references to Self are recovered from.

type Anchor = RcRef<TextBuffer>

The type that holds the reference to Self for the duration of the invocation of the function that has an &Self parameter. This is required to ensure that the lifetimes don’t persist beyond one function call, and so that they remain anonymous.

unsafe fn ref_from_abi(js: Self::Abi) -> Self::Anchor

Recover a Self::Anchor from Self::Abi.

impl RefMutFromWasmAbi for TextBuffer

type Abi = u32

Same as RefFromWasmAbi::Abi

type Anchor = RcRefMut<TextBuffer>

Same as RefFromWasmAbi::Anchor

unsafe fn ref_mut_from_abi(js: Self::Abi) -> Self::Anchor

Same as RefFromWasmAbi::ref_from_abi

impl SupportsConstructor for TextBuffer

impl SupportsInstanceProperty for TextBuffer

impl SupportsStaticProperty for TextBuffer

impl TryFromJsValue for TextBuffer

fn try_from_js_value(value: JsValue) -> Result<Self, JsValue>

Performs the conversion.

fn try_from_js_value_ref(value: &JsValue) -> Option<Self>

Performs the conversion.

impl VectorFromWasmAbi for TextBuffer

type Abi = <Box<[JsValue]> as FromWasmAbi>::Abi

unsafe fn vector_from_abi(js: Self::Abi) -> Box<[TextBuffer]>

impl VectorIntoWasmAbi for TextBuffer

type Abi = <Box<[JsValue]> as IntoWasmAbi>::Abi

fn vector_into_abi(vector: Box<[TextBuffer]>) -> Self::Abi

impl WasmDescribe for TextBuffer

fn describe()

impl WasmDescribeVector for TextBuffer

fn describe_vector()