Struct Span 

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

A byte range in the source. Half-open: [start, end).

Fields

file: FileId

start: usize

end: usize

Implementations

impl Span

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

A Span with no real file identity — the default for every existing construction site the T3.5 migration didn’t touch. See new_in for the real-identity constructor the lexer uses.

pub fn new_in(file: FileId, start: usize, end: usize) -> Self

T3.5: a Span with a real file identity, attached at the one place (the lexer) where it’s actually known.

pub fn range(&self) -> Range<usize>

pub fn offset(self, delta: usize) -> Span

This span shifted right by delta bytes. Used to rebase spans produced against a substring (e.g. a re-lexed interpolation hole) into the full source. (#716.)

pub fn merge(self, other: Span) -> Span

Span covering both self and other (the smallest enclosing range). T3.5: both operands are always the same file in practice (a merge never spans two files); self’s id wins over other’s UNKNOWN if only one side carries a real one, so a merge involving a genuinely lexer-sourced span doesn’t lose its identity to a synthetic partner.

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 From<Range<usize>> for Span

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

Converts to this type from the input 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 Ord for Span

fn cmp(&self, other: &Span) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

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 PartialOrd for Span

fn partial_cmp(&self, other: &Span) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Span

impl Eq for Span

impl StructuralPartialEq for Span