Struct Position 

pub struct Position {
    pub row: usize,
    pub col: usize,
}

A (row, col) location inside a crate::Buffer.

• row is zero-based, in logical lines (newline-separated). Wrapping is a render-only concern; no Position ever points at a display line.
• col is zero-based, char index within the line — not bytes, not graphemes, not display columns. Width-aware motions go through helpers in motion.rs; do not synthesize Position from a column count without consulting them. The accompanying Position::byte_offset helper converts a char-index col back to a byte offset when slicing the underlying String.

Bounds

A Position is valid for a buffer iff:

• row < buffer.lines().len()
• col <= buffer.line(row).unwrap().chars().count() (one past the last char is allowed — insert mode lives there).

Pass an out-of-bounds Position to crate::Buffer::set_cursor and the buffer clamps to the nearest valid one via crate::Buffer::clamp_position. Pass one to crate::Buffer::apply_edit and the edit is rejected (returns the no-op inverse).

Sticky column

crate::Buffer tracks an optional sticky column for j / k motions: the target column to land in once the cursor reaches a line long enough to honor it. Never reset it manually outside motion code — it survives crate::Buffer::set_cursor for that exact reason.

Fields

row: usize

col: usize

Implementations

impl Position

pub const fn new(row: usize, col: usize) -> Self

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

Byte offset of self.col (a char index) into line. Returns line.len() when col is at or past the end of the line — matches String::insert / replace_range boundary semantics.

Trait Implementations

impl Clone for Position

fn clone(&self) -> Position

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Position

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

Formats the value using the given formatter.

impl Default for Position

fn default() -> Position

Returns the “default value” for a type.

impl Hash for Position

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Position

fn cmp(&self, other: &Position) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Position

fn eq(&self, other: &Position) -> 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 PartialOrd for Position

fn partial_cmp(&self, other: &Position) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Position

impl Eq for Position

impl StructuralPartialEq for Position