Struct Span 

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

A span represents a linear portion of the input string (start, end)

See Spanned for more information.

Fields

start: Location

end: Location

Implementations

impl Span

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

Create a new span from a start and end Location

pub const fn empty() -> Span

Returns an empty span (0, 0) -> (0, 0)

Empty spans represent no knowledge of source location See Spanned for more information.

pub fn union(&self, other: &Span) -> Span

Returns the smallest Span that contains both self and other If either span is Span::empty, the other span is returned

Examples

// line 1, column1 -> line 2, column 5
let span1 = Span::new(Location::new(1, 1), Location::new(2, 5));
// line 2, column 3 -> line 3, column 7
let span2 = Span::new(Location::new(2, 3), Location::new(3, 7));
// Union of the two is the min/max of the two spans
// line 1, column 1 -> line 3, column 7
let union = span1.union(&span2);
assert_eq!(union, Span::new(Location::new(1, 1), Location::new(3, 7)));

pub fn union_opt(&self, other: &Option<Span>) -> Span

Same as Span::union for Option<Span>

If other is None, self is returned

pub fn union_iter<I>(iter: I) -> Span

where I: IntoIterator<Item = Span>,

Return the Span::union of all spans in the iterator

If the iterator is empty, an empty span is returned

Example

let spans = vec![
    Span::new(Location::new(1, 1), Location::new(2, 5)),
    Span::new(Location::new(2, 3), Location::new(3, 7)),
    Span::new(Location::new(3, 1), Location::new(4, 2)),
];
// line 1, column 1 -> line 4, column 2
assert_eq!(
  Span::union_iter(spans),
  Span::new(Location::new(1, 1), Location::new(4, 2))
);

Trait Implementations

impl AsNodeKey for Span

fn as_node_key(&self) -> NodeKey<'_>

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<(), Error>

Formats the value using the given formatter.

impl Hash for Span

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

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<'ast> Transformable<'ast> for Span

fn apply_transform_with_path<T>( &'ast self, transformer: &mut T, node_path: &mut NodePath<'ast>, ) -> Result<Self, T::Error>

where T: Transform<'ast>,

Recursively applies transform to self returning Ok(Self) when successful or Err(T::Error) if unsuccessful.

fn apply_transform<T>(&'ast self, transform: &mut T) -> Result<Self, T::Error>

where T: Transform<'ast>,

Recursively applies transform to self returning Ok(Self) when successful or Err(T::Error) if unsuccessful.

impl Visitable for Span

fn accept<'ast, V: Visitor<'ast>>( &'ast self, visitor: &mut V, ) -> ControlFlow<Break<V::Error>>

Accepts a borrowed Visitor and traverses the AST starting at self invoking Visitor::enter and Visitor::exit as nodes are entered and exiting respectively.

fn downcast_ref<Target: Visitable>(&self) -> Option<&Target>

Tries to downcast self as &Target.

fn downcast_mut<Target: Visitable>(&mut self) -> Option<&mut Target>

Tries to downcast self as &mut Target.

fn is<Target: Visitable>(&self) -> bool

Returns true if the inner type is the same as Target.

impl Copy for Span

impl Eq for Span

impl StructuralPartialEq for Span