Struct syn::buffer::Cursor [−][src]
A cheaply copyable cursor into a TokenBuffer
.
This cursor holds a shared reference into the immutable data which is used
internally to represent a TokenStream
, and can be efficiently manipulated
and copied around.
An empty Cursor
can be created directly, or one may create a TokenBuffer
object and get a cursor to its first token with begin()
.
Two cursors are equal if they have the same location in the same input stream, and have the same scope.
This type is available only if Syn is built with the "parsing"
feature.
Implementations
impl<'a> Cursor<'a>
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pub fn empty() -> Self
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Creates a cursor referencing a static empty TokenStream.
pub fn eof(self) -> bool
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Checks whether the cursor is currently pointing at the end of its valid scope.
pub fn group(self, delim: Delimiter) -> Option<(Cursor<'a>, Span, Cursor<'a>)>
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If the cursor is pointing at a Group
with the given delimiter, returns
a cursor into that group and one pointing to the next TokenTree
.
pub fn ident(self) -> Option<(Ident, Cursor<'a>)>
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If the cursor is pointing at a Ident
, returns it along with a cursor
pointing at the next TokenTree
.
pub fn punct(self) -> Option<(Punct, Cursor<'a>)>
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If the cursor is pointing at an Punct
, returns it along with a cursor
pointing at the next TokenTree
.
pub fn literal(self) -> Option<(Literal, Cursor<'a>)>
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If the cursor is pointing at a Literal
, return it along with a cursor
pointing at the next TokenTree
.
pub fn lifetime(self) -> Option<(Lifetime, Cursor<'a>)>
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If the cursor is pointing at a Lifetime
, returns it along with a
cursor pointing at the next TokenTree
.
pub fn token_stream(self) -> TokenStream
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Copies all remaining tokens visible from this cursor into a
TokenStream
.
pub fn token_tree(self) -> Option<(TokenTree, Cursor<'a>)>
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If the cursor is pointing at a TokenTree
, returns it along with a
cursor pointing at the next TokenTree
.
Returns None
if the cursor has reached the end of its stream.
This method does not treat None
-delimited groups as transparent, and
will return a Group(None, ..)
if the cursor is looking at one.
pub fn span(self) -> Span
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Returns the Span
of the current token, or Span::call_site()
if this
cursor points to eof.
Trait Implementations
impl<'a> Clone for Cursor<'a>
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fn clone(&self) -> Self
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pub fn clone_from(&mut self, source: &Self)
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impl<'a> Copy for Cursor<'a>
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impl<'a> Eq for Cursor<'a>
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impl<'a> PartialEq<Cursor<'a>> for Cursor<'a>
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Auto Trait Implementations
impl<'a> RefUnwindSafe for Cursor<'a>
impl<'a> !Send for Cursor<'a>
impl<'a> !Sync for Cursor<'a>
impl<'a> Unpin for Cursor<'a>
impl<'a> UnwindSafe for Cursor<'a>
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,
pub 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.
pub fn to_owned(&self) -> T
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pub 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.
pub 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>,