Struct syntax::ext::hygiene::SyntaxContext [−][src]
pub struct SyntaxContext(_);
A SyntaxContext represents a chain of macro expansions (represented by marks).
Methods
impl SyntaxContext
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impl SyntaxContext
pub const fn empty() -> SyntaxContext
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pub const fn empty() -> SyntaxContext
pub fn allocate_directly(expansion_info: ExpnInfo) -> SyntaxContext
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pub fn allocate_directly(expansion_info: ExpnInfo) -> SyntaxContext
pub fn apply_mark(self, mark: Mark) -> SyntaxContext
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pub fn apply_mark(self, mark: Mark) -> SyntaxContext
Extend a syntax context with a given mark
pub fn remove_mark(&mut self) -> Mark
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pub fn remove_mark(&mut self) -> Mark
Pulls a single mark off of the syntax context. This effectively moves the context up one macro definition level. That is, if we have a nested macro definition as follows:
macro_rules! f { macro_rules! g { ... } }
and we have a SyntaxContext that is referring to something declared by an invocation of g (call it g1), calling remove_mark will result in the SyntaxContext for the invocation of f that created g1. Returns the mark that was removed.
pub fn marks(self) -> Vec<Mark>
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pub fn marks(self) -> Vec<Mark>
pub fn adjust(&mut self, expansion: Mark) -> Option<Mark>
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pub fn adjust(&mut self, expansion: Mark) -> Option<Mark>
Adjust this context for resolution in a scope created by the given expansion.
For example, consider the following three resolutions of f
:
mod foo { pub fn f() {} } // `f`'s `SyntaxContext` is empty. m!(f); macro m($f:ident) { mod bar { pub fn f() {} // `f`'s `SyntaxContext` has a single `Mark` from `m`. pub fn $f() {} // `$f`'s `SyntaxContext` is empty. } foo::f(); // `f`'s `SyntaxContext` has a single `Mark` from `m` //^ Since `mod foo` is outside this expansion, `adjust` removes the mark from `f`, //| and it resolves to `::foo::f`. bar::f(); // `f`'s `SyntaxContext` has a single `Mark` from `m` //^ Since `mod bar` not outside this expansion, `adjust` does not change `f`, //| and it resolves to `::bar::f`. bar::$f(); // `f`'s `SyntaxContext` is empty. //^ Since `mod bar` is not outside this expansion, `adjust` does not change `$f`, //| and it resolves to `::bar::$f`. }
This returns the expansion whose definition scope we use to privacy check the resolution,
or None
if we privacy check as usual (i.e. not w.r.t. a macro definition scope).
pub fn glob_adjust(
&mut self,
expansion: Mark,
glob_ctxt: SyntaxContext
) -> Option<Option<Mark>>
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pub fn glob_adjust(
&mut self,
expansion: Mark,
glob_ctxt: SyntaxContext
) -> Option<Option<Mark>>
Adjust this context for resolution in a scope created by the given expansion
via a glob import with the given SyntaxContext
.
For example:
m!(f); macro m($i:ident) { mod foo { pub fn f() {} // `f`'s `SyntaxContext` has a single `Mark` from `m`. pub fn $i() {} // `$i`'s `SyntaxContext` is empty. } n(f); macro n($j:ident) { use foo::*; f(); // `f`'s `SyntaxContext` has a mark from `m` and a mark from `n` //^ `glob_adjust` removes the mark from `n`, so this resolves to `foo::f`. $i(); // `$i`'s `SyntaxContext` has a mark from `n` //^ `glob_adjust` removes the mark from `n`, so this resolves to `foo::$i`. $j(); // `$j`'s `SyntaxContext` has a mark from `m` //^ This cannot be glob-adjusted, so this is a resolution error. } }
This returns None
if the context cannot be glob-adjusted.
Otherwise, it returns the scope to use when privacy checking (see adjust
for details).
pub fn reverse_glob_adjust(
&mut self,
expansion: Mark,
glob_ctxt: SyntaxContext
) -> Option<Option<Mark>>
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pub fn reverse_glob_adjust(
&mut self,
expansion: Mark,
glob_ctxt: SyntaxContext
) -> Option<Option<Mark>>
Undo glob_adjust
if possible:
if let Some(privacy_checking_scope) = self.reverse_glob_adjust(expansion, glob_ctxt) { assert!(self.glob_adjust(expansion, glob_ctxt) == Some(privacy_checking_scope)); }
pub fn modern(self) -> SyntaxContext
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pub fn modern(self) -> SyntaxContext
pub fn outer(self) -> Mark
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pub fn outer(self) -> Mark
Trait Implementations
impl Decodable for SyntaxContext
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impl Decodable for SyntaxContext
impl PartialOrd<SyntaxContext> for SyntaxContext
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impl PartialOrd<SyntaxContext> for SyntaxContext
fn partial_cmp(&self, other: &SyntaxContext) -> Option<Ordering>
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fn partial_cmp(&self, other: &SyntaxContext) -> Option<Ordering>
This method returns an ordering between self
and other
values if one exists. Read more
fn lt(&self, other: &SyntaxContext) -> bool
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fn lt(&self, other: &SyntaxContext) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
fn le(&self, other: &SyntaxContext) -> bool
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fn le(&self, other: &SyntaxContext) -> bool
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
fn gt(&self, other: &SyntaxContext) -> bool
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fn gt(&self, other: &SyntaxContext) -> bool
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
fn ge(&self, other: &SyntaxContext) -> bool
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fn ge(&self, other: &SyntaxContext) -> bool
This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
impl Hash for SyntaxContext
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impl Hash for SyntaxContext
fn hash<__H>(&self, state: &mut __H) where
__H: Hasher,
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fn hash<__H>(&self, state: &mut __H) where
__H: Hasher,
Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
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fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more
impl Clone for SyntaxContext
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impl Clone for SyntaxContext
fn clone(&self) -> SyntaxContext
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fn clone(&self) -> SyntaxContext
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Default for SyntaxContext
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impl Default for SyntaxContext
fn default() -> SyntaxContext
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fn default() -> SyntaxContext
Returns the "default value" for a type. Read more
impl Debug for SyntaxContext
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impl Debug for SyntaxContext
fn fmt(&self, f: &mut Formatter) -> Result<(), Error>
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fn fmt(&self, f: &mut Formatter) -> Result<(), Error>
Formats the value using the given formatter. Read more
impl Encodable for SyntaxContext
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impl Encodable for SyntaxContext
impl Copy for SyntaxContext
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impl Copy for SyntaxContext
impl Ord for SyntaxContext
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impl Ord for SyntaxContext
fn cmp(&self, other: &SyntaxContext) -> Ordering
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fn cmp(&self, other: &SyntaxContext) -> Ordering
This method returns an Ordering
between self
and other
. Read more
fn max(self, other: Self) -> Self
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fn max(self, other: Self) -> Self
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self
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fn min(self, other: Self) -> Self
Compares and returns the minimum of two values. Read more
impl Eq for SyntaxContext
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impl Eq for SyntaxContext
impl PartialEq<SyntaxContext> for SyntaxContext
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impl PartialEq<SyntaxContext> for SyntaxContext
fn eq(&self, other: &SyntaxContext) -> bool
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fn eq(&self, other: &SyntaxContext) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, other: &SyntaxContext) -> bool
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fn ne(&self, other: &SyntaxContext) -> bool
This method tests for !=
.
Auto Trait Implementations
impl Send for SyntaxContext
impl Send for SyntaxContext
impl Sync for SyntaxContext
impl Sync for SyntaxContext