[−][src]Struct syntax::ext::tt::macro_parser::MatcherPos
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Represents a single "position" (aka "matcher position", aka "item"), as described in the module documentation.
Fields
top_elts: TokenTreeOrTokenTreeSlice<'a>
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The token or sequence of tokens that make up the matcher
idx: usize
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The position of the "dot" in this matcher
sp_open: Span
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The first span of source source that the beginning of this matcher corresponds to. In other
words, the token in the source whose span is sp_open
is matched against the first token of
the matcher.
matches: Vec<Rc<Vec<NamedMatch>>>
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For each named metavar in the matcher, we keep track of token trees matched against the
metavar by the black box parser. In particular, there may be more than one match per
metavar if we are in a repetition (each repetition matches each of the variables).
Moreover, matchers and repetitions can be nested; the matches
field is shared (hence the
Rc
) among all "nested" matchers. match_lo
, match_cur
, and match_hi
keep track of
the current position of the self
matcher position in the shared matches
list.
Also, note that while we are descending into a sequence, matchers are given their own
matches
vector. Only once we reach the end of a full repetition of the sequence do we add
all bound matches from the submatcher into the shared top-level matches
vector. If sep
and up
are Some
, then matches
is not the shared top-level list. Instead, if one
wants the shared matches
, one should use up.matches
.
match_lo: usize
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The position in matches
corresponding to the first metavar in this matcher's sequence of
token trees. In other words, the first metavar in the first token of top_elts
corresponds
to matches[match_lo]
.
match_cur: usize
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The position in matches
corresponding to the metavar we are currently trying to match
against the source token stream. match_lo <= match_cur <= match_hi
.
match_hi: usize
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Similar to match_lo
except match_hi
is the position in matches
of the last metavar
in this matcher.
seq_op: Option<KleeneOp>
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The KleeneOp of this sequence if we are in a repetition.
sep: Option<Token>
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The separator if we are in a repetition
up: Option<MatcherPosHandle<'a>>
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The "parent" matcher position if we are in a repetition. That is, the matcher position just before we enter the sequence.
stack: Vec<MatcherTtFrame<'a>>
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When matching against matchers with nested delimited submatchers (e.g. pat ( pat ( .. ) pat ) pat
), we need to keep track of the matchers we are descending into. This stack does
that where the bottom of the stack is the outermost matcher.
Methods
impl<'a> MatcherPos<'a>
[src]
impl<'a> MatcherPos<'a>
fn push_match(&mut self, idx: usize, m: NamedMatch)
[src]
fn push_match(&mut self, idx: usize, m: NamedMatch)
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Add m
as a named match for the idx
-th metavar.
Trait Implementations
impl<'a> Clone for MatcherPos<'a>
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impl<'a> Clone for MatcherPos<'a>
fn clone(&self) -> MatcherPos<'a>
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fn clone(&self) -> MatcherPos<'a>
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
Auto Trait Implementations
impl<'a> !Send for MatcherPos<'a>
impl<'a> !Send for MatcherPos<'a>
impl<'a> !Sync for MatcherPos<'a>
impl<'a> !Sync for MatcherPos<'a>
Blanket Implementations
impl<T> ToOwned for T where
T: Clone,
[src]
impl<T> ToOwned for T where
T: Clone,
type Owned = T
fn to_owned(&self) -> T
[src]
fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
fn clone_into(&self, target: &mut T)
[src]
fn clone_into(&self, target: &mut T)
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
impl<T> From for T
[src]
impl<T> From for T
impl<T, U> Into for T where
U: From<T>,
[src]
impl<T, U> Into for T where
U: From<T>,
impl<T, U> TryFrom for T where
T: From<U>,
[src]
impl<T, U> TryFrom for T where
T: From<U>,
type Error = !
try_from
)The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
[src]
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
try_from
)Performs the conversion.
impl<T> Borrow for T where
T: ?Sized,
[src]
impl<T> Borrow for T where
T: ?Sized,
ⓘImportant traits for &'a mut Rfn borrow(&self) -> &T
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fn borrow(&self) -> &T
Immutably borrows from an owned value. Read more
impl<T, U> TryInto for T where
U: TryFrom<T>,
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impl<T, U> TryInto for T where
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
try_from
)The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
[src]
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
try_from
)Performs the conversion.
impl<T> BorrowMut for T where
T: ?Sized,
[src]
impl<T> BorrowMut for T where
T: ?Sized,
ⓘImportant traits for &'a mut Rfn borrow_mut(&mut self) -> &mut T
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fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<T> Any for T where
T: 'static + ?Sized,
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impl<T> Any for T where
T: 'static + ?Sized,
fn get_type_id(&self) -> TypeId
[src]
fn get_type_id(&self) -> TypeId
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static
Gets the TypeId
of self
. Read more
impl<E> SpecializationError for E
[src]
impl<E> SpecializationError for E
fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where
T: ?Sized,
[src]
fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where
T: ?Sized,
🔬 This is a nightly-only experimental API. (rustc_private
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S
is the encoder/decoder state type, T
is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more
impl<T> Erased for T
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impl<T> Erased for T
impl<T> Send for T where
T: ?Sized,
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impl<T> Send for T where
T: ?Sized,
impl<T> Sync for T where
T: ?Sized,
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impl<T> Sync for T where
T: ?Sized,
impl<T> Erased for T
impl<T> Erased for T