[−][src]Struct serde_lexpr::parse::Datum
Combines an S-expression value with location information.
A Datum
keeps, along with a plain Value
, information about the text
location the value was parsed from. For compound values, such as lists and
vectors, that includes information for all contained values, recursively.
A Datum
can be obtained by using the parse_datum
and expect_datum
methods on Parser
.
Methods
impl Datum
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pub fn value(&self) -> &Value
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Returns a reference to the contained value.
pub fn span(&self) -> Span
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Returns the span for the compelete value.
pub fn as_ref(&self) -> Ref
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Returns a reference to the datum.
pub fn list_iter(&self) -> Option<ListIter>
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Returns an iterator over the elements of a list.
If the value contained in the datum is not either a cons cell or Null
, None
is
returned.
Note that the returned iterator has special behavior for improper lists, yielding the
element after the dot after returning None
the first time.
use lexpr::sexp; let datum = lexpr::datum::from_str("(1 2 . 3)").unwrap(); let mut iter = datum.list_iter().unwrap(); let one = iter.next().unwrap(); assert_eq!(one.value(), &sexp!(1)); let two = iter.next().unwrap(); assert_eq!(two.value(), &sexp!(2)); assert_eq!(iter.next(), None); let three = iter.next().unwrap(); assert_eq!(three.value(), &sexp!(3)); assert_eq!(iter.next(), None);
pub fn vector_iter(&self) -> Option<VectorIter>
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Returns an iterator over the elements of a vector.
If the value contained in the datum is not a vector, None
is returned.
Trait Implementations
impl Clone for Datum
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impl Debug for Datum
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impl From<Datum> for Value
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impl<'a> From<Ref<'a>> for Datum
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fn from(r: Ref<'a>) -> Datum
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Turns a reference into an owned Datum
, by cloning the referenced value and location
information.
impl PartialEq<Datum> for Datum
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impl StructuralPartialEq for Datum
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Auto Trait Implementations
impl RefUnwindSafe for Datum
impl Send for Datum
impl Sync for Datum
impl Unpin for Datum
impl UnwindSafe for Datum
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,