[−][src]Enum syntax::tokenstream::TokenTree
When the main rust parser encounters a syntax-extension invocation, it parses the arguments to the invocation as a token-tree. This is a very loose structure, such that all sorts of different AST-fragments can be passed to syntax extensions using a uniform type.
If the syntax extension is an MBE macro, it will attempt to match its
LHS token tree against the provided token tree, and if it finds a
match, will transcribe the RHS token tree, splicing in any captured
macro_parser::matched_nonterminals
into the SubstNt
s it finds.
The RHS of an MBE macro is the only place SubstNt
s are substituted.
Nothing special happens to misnamed or misplaced SubstNt
s.
Variants
Token(Span, Token)
A single token
Delimited(DelimSpan, DelimToken, TokenStream)
A delimited sequence of token trees
Methods
impl TokenTree
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pub fn parse(
cx: &ExtCtxt,
mtch: &[TokenTree],
tts: TokenStream
) -> NamedParseResult
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cx: &ExtCtxt,
mtch: &[TokenTree],
tts: TokenStream
) -> NamedParseResult
Use this token tree as a matcher to parse given tts.
pub fn eq_unspanned(&self, other: &TokenTree) -> bool
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Checks if this TokenTree is equal to the other, regardless of span information.
pub fn probably_equal_for_proc_macro(&self, other: &TokenTree) -> bool
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pub fn span(&self) -> Span
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Retrieves the TokenTree's span.
pub fn set_span(&mut self, span: Span)
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Modify the TokenTree
's span in-place.
pub fn eq_token(&self, t: Token) -> bool
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Indicates if the stream is a token that is equal to the provided token.
pub fn joint(self) -> TokenStream
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pub fn open_tt(span: Span, delim: DelimToken) -> TokenTree
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Returns the opening delimiter as a token tree.
pub fn close_tt(span: Span, delim: DelimToken) -> TokenTree
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Returns the closing delimiter as a token tree.
Trait Implementations
impl PartialEq<TokenTree> for TokenTree
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impl From<TokenTree> for TokenStream
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fn from(tree: TokenTree) -> TokenStream
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impl From<TokenTree> for TreeAndJoint
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fn from(tree: TokenTree) -> TreeAndJoint
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impl Clone for TokenTree
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fn clone(&self) -> TokenTree
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fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Debug for TokenTree
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impl Encodable for TokenTree
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impl Decodable for TokenTree
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Auto Trait Implementations
Blanket Implementations
impl<T, U> Into 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,
impl<T> From for T
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impl<T, U> TryFrom 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> Borrow for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T, U> TryInto for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Encodable for T where
T: UseSpecializedEncodable + ?Sized,
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T: UseSpecializedEncodable + ?Sized,
impl<T> Decodable for T where
T: UseSpecializedDecodable,
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T: UseSpecializedDecodable,
impl<E> SpecializationError for E
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impl<T> Send for T where
T: ?Sized,
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T: ?Sized,
impl<T> Sync for T where
T: ?Sized,
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T: ?Sized,