Struct LineIndex 

pub struct LineIndex { /* private fields */ }

Logical line index - implemented using Rope data structure

Rope provides O(log N) line access, insertion, and deletion performance, suitable for large file editing

Implementations

impl LineIndex

pub fn new() -> Self

Create a new line index

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

Build line index from already-normalized internal text.

This low-level constructor does not normalize line endings. Higher-level editor entry points normalize CRLF and lone CR to LF before constructing LineIndex; direct CRLF input here keeps \r as ordinary line content.

pub fn delete_line(&mut self, line_number: usize)

Delete the specified line

pub fn get_line(&self, line_number: usize) -> Option<LineMetadata>

Get metadata for the specified line number (simulated)

pub fn line_to_offset(&self, line_number: usize) -> usize

👎Deprecated:

legacy byte offset excludes previous LF separators; use position_to_char_offset plus char_offset_to_byte_offset

Legacy byte offset for a line start, excluding previous LF separator bytes.

Prefer LineIndex::position_to_char_offset plus LineIndex::char_offset_to_byte_offset for offsets in the canonical document text. This compatibility method preserves the older byte-offset convention where previous \n bytes are not counted. If this index was built directly from CRLF text, \r remains line content and is counted.

pub fn offset_to_line(&self, offset: usize) -> usize

👎Deprecated:

legacy byte offset excludes previous LF separators; use byte_offset_to_char_offset plus char_offset_to_position

Legacy line lookup from a byte offset that excludes previous LF separator bytes.

Prefer LineIndex::byte_offset_to_char_offset plus LineIndex::char_offset_to_position for offsets in the canonical document text. This compatibility method uses the same legacy convention as LineIndex::line_to_offset.

pub fn char_offset_to_position(&self, char_offset: usize) -> (usize, usize)

Get line number and offset within line from character offset

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

Get character offset from line number and column number

pub fn line_count(&self) -> usize

Get total line count

pub fn byte_count(&self) -> usize

Get total byte count

pub fn char_count(&self) -> usize

Get total character count

pub fn char_at(&self, char_offset: usize) -> Option<char>

Get the character at the specified character offset (Unicode scalar index).

Returns None if char_offset is out of bounds.

pub fn char_offset_to_byte_offset(&self, char_offset: usize) -> usize

Convert a character offset (Unicode scalar values) to a UTF-8 byte offset.

The returned byte offset is clamped to the document length.

pub fn byte_offset_to_char_offset(&self, byte_offset: usize) -> usize

Convert a UTF-8 byte offset to a character offset (Unicode scalar values).

The returned character offset is clamped to the document length.

pub fn char_offset_to_line_byte_column( &self, char_offset: usize, ) -> (usize, usize)

Convert a character offset to (line, byte_column) where byte_column is measured in UTF-8 bytes.

pub fn insert(&mut self, char_offset: usize, text: &str)

Insert text (at specified character offset)

pub fn delete(&mut self, start_char: usize, len_chars: usize)

Delete text range (character offset)

pub fn get_text(&self) -> String

Get complete text

pub fn get_range(&self, start_char: usize, len_chars: usize) -> String

Get text in the specified character range.

pub fn get_line_text(&self, line_number: usize) -> Option<String>

Get text of the specified line (excluding newline)

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 Default for LineIndex

fn default() -> Self

Returns the “default value” for a type.