Struct Span 

pub struct Span { /* private fields */ }

A span, designating a range of bytes where a token is located.

Uses u32::MAX as a sentinel value to represent unknown spans (e.g., decoded from binary).

Implementations

impl Span

pub fn new(start: u32, end: u32) -> Span

pub fn adjust(&mut self, offset: u32)

Adjusts this span by adding the given byte offset to both start and end.

pub fn start(&self) -> u32

Returns the start offset, panicking if this is an unknown span.

pub fn end(&self) -> u32

Returns the end offset, panicking if this is an unknown span.

pub fn set_end(&mut self, new_end: u32)

Sets the end offset. If this is unknown, converts to a zero-width span at that position.

pub fn set_start(&mut self, new_start: u32)

Sets the start offset. If this is unknown, converts to a zero-width span at that position.

pub fn is_known(&self) -> bool

Returns true if this span has a known source location.

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 Default for Span

fn default() -> Span

Returns the “default value” for a type.

impl Hash for Span

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 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