Struct xi_rope::rope::LinesMetric

pub struct LinesMetric(_);

Trait Implementations

impl Metric<RopeInfo> for LinesMetric

Measured unit is newline amount. Base unit is utf8 code unit. Boundary is trailing and determined by a newline char.

fn measure(info: &RopeInfo, _: usize) -> usize

Return the size of the NodeInfo::L, as measured by this metric.

fn is_boundary(s: &String, offset: usize) -> bool

Return whether the offset in base units is a boundary of this metric. If a boundary is at end of a leaf then this method must return true. However, a boundary at the beginning of a leaf is optional (the previous leaf will be queried).

fn to_base_units(s: &String, in_measured_units: usize) -> usize

Returns the smallest offset, in base units, for an offset in measured units.

fn from_base_units(s: &String, in_base_units: usize) -> usize

Returns the smallest offset in measured units corresponding to an offset in base units.

fn prev(s: &String, offset: usize) -> Option<usize>

Returns the index of the boundary directly preceding offset, or None if no such boundary exists. Input and result are in base units.

fn next(s: &String, offset: usize) -> Option<usize>

Returns the index of the first boundary for which index > offset, or None if no such boundary exists. Input and result are in base units.

fn can_fragment() -> bool

Returns true if the measured units in this metric can span multiple leaves. As an example, in a metric that measures lines in a rope, a line may start in one leaf and end in another; however in a metric measuring bytes, storage of a single byte cannot extend across leaves.

impl Copy for LinesMetric

impl Clone for LinesMetric

fn clone(&self) -> LinesMetric

Returns a copy of the value.

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

Performs copy-assignment from source.