Struct LineIndex 

pub struct LineIndex { /* private fields */ }

Snapshot index of logical line starts for a UTF-8 text buffer.

LineIndex stores only line-start byte offsets and the source text length. Methods that need to inspect content take &str; callers should rebuild the index when that text changes. Only \n creates a new logical line, so \r remains ordinary content. Empty text has one logical line, and a trailing \n creates a final empty line.

Implementations

impl LineIndex

pub fn new(text: &str) -> Self

Build a line index for a text snapshot.

pub fn text_len(&self) -> usize

Return the byte length of the text snapshot used to build this index.

pub fn line_count(&self) -> usize

Return the number of logical lines in this snapshot.

pub fn line_start(&self, line: usize) -> usize

Return the byte offset at the start of line, clamped to an existing line.

pub fn line_end(&self, text: &str, line: usize) -> usize

Return the byte offset at the end of line, excluding a trailing newline.

pub fn line_end_including_newline(&self, text: &str, line: usize) -> usize

Return the byte offset at the end of line, including its newline if present.

pub fn line_range(&self, text: &str, line: usize) -> Range<usize>

Return the byte range for line, excluding a trailing newline.

pub fn byte_to_position(&self, text: &str, byte: usize) -> TextPosition

Convert a byte offset to a Unicode-scalar line/column position.

pub fn position_to_byte(&self, text: &str, position: TextPosition) -> usize

Convert a Unicode-scalar line/column position to a byte offset.

pub fn byte_to_position_with_encoding( &self, text: &str, byte: usize, encoding: TextEncoding, ) -> TextPosition

Convert a byte offset to a line/column position using encoding for columns.

pub fn position_to_byte_with_encoding( &self, text: &str, position: TextPosition, encoding: TextEncoding, ) -> usize

Convert a line/column position using encoding for columns to a byte offset.

pub fn byte_range_to_range(&self, text: &str, range: Range<usize>) -> TextRange

Convert a byte range to a text range using Unicode-scalar columns.

pub fn range_to_byte_range(&self, text: &str, range: TextRange) -> Range<usize>

Convert a text range using Unicode-scalar columns to a byte range.

Trait Implementations

impl Clone for LineIndex

fn clone(&self) -> LineIndex

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LineIndex

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

Formats the value using the given formatter.

impl Eq for LineIndex

impl PartialEq for LineIndex

fn eq(&self, other: &LineIndex) -> 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 StructuralPartialEq for LineIndex