Struct Span 

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

range of a token in the source code

Fields

start: usize

byte offset of start position ( inclusive )

end: usize

byte offset of end position ( exclusive )

Implementations

impl Span

pub fn new_none() -> Self

create a span that covers nowhere

pub fn is_none(&self) -> bool

check if the span covers nowhere

pub fn is_empty(&self) -> bool

pub fn new_single(point: usize) -> Self

create a span that covers a single character

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

pub fn merge(&self, other: &Self) -> Self

merge two spans into one. the new span will cover both of the original spans.

pub fn merge_ordered(&self, right: &Self) -> Self

merge two spans into one. the new span will cover both of the original spans.

pub fn try_merge(&self, other: &Self) -> Option<Self>

try to merge two spans into one. return None if either of the spans points to nowhere.

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 From<Range<usize>> for Span

fn from(range: Range<usize>) -> Self

Converts to this type from the input type.

impl Into<Range<usize>> for Span

fn into(self) -> Range<usize>

Converts this type into the (usually inferred) input type.

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