Struct ViewLine 

pub struct ViewLine {
    pub text: String,
    pub source_start_byte: Option<usize>,
    pub char_source_bytes: Vec<Option<usize>>,
    pub char_styles: Vec<Option<ViewTokenStyle>>,
    pub char_visual_cols: Vec<usize>,
    pub visual_to_char: Vec<usize>,
    pub tab_starts: HashSet<usize>,
    pub line_start: LineStart,
    pub ends_with_newline: bool,
}

A display line built from tokens, preserving token-level information

Fields

text: String

The display text for this line (tabs expanded to spaces, etc.)

source_start_byte: Option<usize>

Absolute source byte offset of the start of this line (if it has one)

char_source_bytes: Vec<Option<usize>>

Source byte offset for each character Length == text.chars().count()

char_styles: Vec<Option<ViewTokenStyle>>

Style for each character (from token styles)

char_visual_cols: Vec<usize>

Visual column where each character starts

visual_to_char: Vec<usize>

Character index at each visual column (for O(1) mouse clicks) For double-width chars, consecutive visual columns map to the same char index Length == total visual width of line

tab_starts: HashSet<usize>

Positions that are the start of a tab expansion

line_start: LineStart

How this line started (what kind of token/boundary preceded it)

ends_with_newline: bool

Whether this line ends with a newline character

Implementations

impl ViewLine

pub fn source_byte_at_char(&self, char_idx: usize) -> Option<usize>

Get source byte at a given character index (O(1))

pub fn char_at_visual_col(&self, visual_col: usize) -> usize

Get character index at a given visual column (O(1))

pub fn source_byte_at_visual_col(&self, visual_col: usize) -> Option<usize>

Get source byte at a given visual column (O(1) for mouse clicks)

pub fn visual_col_at_char(&self, char_idx: usize) -> usize

Get the visual column for a character at the given index

pub fn visual_width(&self) -> usize

Total visual width of this line

Trait Implementations

impl Clone for ViewLine

fn clone(&self) -> ViewLine

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ViewLine

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

Formats the value using the given formatter.