Struct Span 

pub struct Span {
    pub start: usize,
    pub end: usize,
}

Byte offset range into the source string.

start is inclusive, end is exclusive (Rust slice convention). line_col accuracy is byte-based: for ASCII input, column equals the visual position. Multi-byte UTF-8 characters count as one column per code point (char boundary) for line calculation, but col is still byte-offset from the line start — annotate accordingly if you expose this to users with non-ASCII input.

Fields

start: usize

end: usize

Implementations

impl Span

pub fn new(start: usize, end: usize) -> Self

pub fn line_col(&self, source: &str) -> (usize, usize)

Returns the (line, col) of self.start, both 1-based.

pub fn source_line<'a>(&self, source: &'a str) -> &'a str

Returns the full source line that contains self.start.

pub fn slice<'a>(&self, source: &'a str) -> &'a str

The source slice covered by this span.

pub fn len(&self) -> usize

Number of bytes in this span.

pub fn is_empty(&self) -> bool

Trait Implementations

impl Clone for Span

fn clone(&self) -> Span

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Span

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

Formats the value using the given formatter.

impl PartialEq for Span

fn eq(&self, other: &Span) -> 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 Copy for Span

impl Eq for Span

impl StructuralPartialEq for Span