Struct SourceSpan 

pub struct SourceSpan {
    pub start: usize,
    pub end: usize,
    pub source: Option<String>,
}

Lightweight span into a source program — a byte range [start, end) plus an optional filename or logical label.

This type deliberately does not depend on any particular parser — it is a minimal, self-contained substitute that can be produced by any upstream frontend. The compiler never dereferences the span; it is only propagated for diagnostic printing.

Fields

start: usize

Byte offset of the first character (inclusive).

end: usize

Byte offset one past the last character (exclusive).

source: Option<String>

Logical source label (e.g. a file path or "<stdin>"); optional.

Implementations

impl SourceSpan

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

Construct a span without a source label.

pub fn with_source(start: usize, end: usize, source: impl Into<String>) -> Self

Construct a span carrying a source label (e.g. a filename).

pub fn len(&self) -> usize

Length of the span in bytes (end − start, saturating to zero).

pub fn is_empty(&self) -> bool

Returns true when the span is empty (length zero).

Trait Implementations

impl Clone for SourceSpan

fn clone(&self) -> SourceSpan

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SourceSpan

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

Formats the value using the given formatter.

impl Display for SourceSpan

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

Formats the value using the given formatter.

impl Hash for SourceSpan

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 PartialEq for SourceSpan

fn eq(&self, other: &SourceSpan) -> 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 Eq for SourceSpan

impl StructuralPartialEq for SourceSpan