Enum textwrap::core::WrapAlgorithm

pub enum WrapAlgorithm {
    OptimalFit,
    FirstFit,
}

Wrapping algorithms.

After a text has been broken into Fragments, the one now has to decide how to break the fragments into lines. The simplest algorithm for this is implemented by wrap_first_fit: it uses no look-ahead and simply adds fragments to the line as long as they fit. However, this can lead to poor line breaks if a large fragment almost-but-not-quite fits on a line. When that happens, the fragment is moved to the next line and it will leave behind a large gap. A more advanced algorithm, implemented by wrap_optimal_fit, will take this into account. The optimal-fit algorithm considers all possible line breaks and will attempt to minimize the gaps left behind by overly short lines.

While both algorithms run in linear time, the first-fit algorithm is about 4 times faster than the optimal-fit algorithm.

Variants

OptimalFit

Use an advanced algorithm which considers the entire paragraph to find optimal line breaks. Implemented by wrap_optimal_fit.

FirstFit

Use a fast and simple algorithm with no look-ahead to find line breaks. Implemented by wrap_first_fit.

Trait Implementations

impl Clone for WrapAlgorithm

fn clone(&self) -> WrapAlgorithm

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for WrapAlgorithm

impl Debug for WrapAlgorithm

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

Formats the value using the given formatter.

impl Eq for WrapAlgorithm

impl PartialEq<WrapAlgorithm> for WrapAlgorithm

fn eq(&self, other: &WrapAlgorithm) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use]fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl StructuralEq for WrapAlgorithm

impl StructuralPartialEq for WrapAlgorithm