Struct LineIndex 

pub struct LineIndex { /* private fields */ }

A line-start table over one text snapshot.

Rebuild one per text revision (Document does this automatically); conversions are then O(log lines) plus O(line length) for the column walk.

Examples

use increparse_lsp::{LineIndex, PositionEncoding};
use lsp_types::Position;

let text = "héllo\nwörld";
let index = LineIndex::new(text);

// "héllo" is 6 bytes / 5 UTF-16 units; end of line 0:
assert_eq!(
    index.offset(text, Position::new(0, 5), PositionEncoding::Utf16),
    Some(6)
);
assert_eq!(
    index.position(text, 6, PositionEncoding::Utf16),
    Position::new(0, 5)
);

Implementations

impl LineIndex

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

Builds the index for text.

pub fn line_count(&self) -> usize

Number of lines (a trailing newline starts a final empty line).

pub fn line_start(&self, line: u32) -> Option<usize>

Byte offset where line begins.

pub fn line_end(&self, text: &str, line: u32) -> Option<usize>

Byte offset just past the last byte of line, excluding the line terminator.

pub fn offset( &self, text: &str, position: Position, encoding: PositionEncoding, ) -> Option<usize>

Converts a Position to a byte offset.

Out-of-range lines clamp to the last line; overshooting columns clamp to the end of the line (LSP clients legitimately send both while typing). Returns None only if position.line overflows u32.

pub fn position( &self, text: &str, offset: usize, encoding: PositionEncoding, ) -> Position

Converts a byte offset to a Position.

Out-of-bounds offsets clamp to the text length; offsets inside a multibyte character or a line terminator round down to the char boundary before them.

Trait Implementations

impl Clone for LineIndex

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 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: &Self) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LineIndex