Struct LineIndex 

pub struct LineIndex<'a, A: Allocator = Global> { /* private fields */ }

Precomputed line-start offsets for a source string, enabling O(log lines) line/column lookup.

Building the index is a single linear pass over the source; each subsequent LineIndex::line_and_column is a binary search plus a per-line character count. Prefer this over Span::line_and_column whenever resolving more than a couple of spans against one source.

Implementations

impl<'a> LineIndex<'a, Global>

pub fn new(source: &'a str) -> Self

Build a line index for source in a single pass.

impl<'a, A: Allocator> LineIndex<'a, A>

pub fn new_in(source: &'a str, alloc: A) -> Self

Build a line index for source in a single pass, allocating the backing table in alloc.

pub fn line_and_column(&self, span: Span) -> (u32, u32)

Returns the zero-based (line, column) of the span’s start, where column counts Unicode scalar values from the line start. Matches Span::line_and_column exactly.

Trait Implementations

impl<'a, A: Clone + Allocator> Clone for LineIndex<'a, A>

fn clone(&self) -> LineIndex<'a, A>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a, A: Debug + Allocator> Debug for LineIndex<'a, A>

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

Formats the value using the given formatter.