pub struct StripUnconfigured<'a> {
    pub sess: &'a Session,
    pub features: Option<&'a Features>,
    pub config_tokens: bool,
    pub lint_node_id: NodeId,
}
Expand description

A folder that strips out items that do not belong in the current configuration.

Fields§

§sess: &'a Session§features: Option<&'a Features>§config_tokens: bool

If true, perform cfg-stripping on attached tokens. This is only used for the input to derive macros, which needs eager expansion of cfg and cfg_attr

§lint_node_id: NodeId

Implementations§

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impl<'a> StripUnconfigured<'a>

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pub fn configure<T: HasAttrs + HasTokens>(&self, node: T) -> Option<T>

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fn try_configure_tokens<T: HasTokens>(&self, node: &mut T)

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fn configure_krate_attrs(&self, attrs: AttrVec) -> Option<AttrVec>

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fn configure_tokens(&self, stream: &AttrTokenStream) -> AttrTokenStream

Performs cfg-expansion on stream, producing a new AttrTokenStream. This is only used during the invocation of derive proc-macros, which require that we cfg-expand their entire input. Normal cfg-expansion operates on parsed AST nodes via the configure method

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fn process_cfg_attrs<T: HasAttrs>(&self, node: &mut T)

Parse and expand all cfg_attr attributes into a list of attributes that are within each cfg_attr that has a true configuration predicate.

Gives compiler warnings if any cfg_attr does not contain any attributes and is in the original source code. Gives compiler errors if the syntax of any cfg_attr is incorrect.

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fn process_cfg_attr(&self, attr: Attribute) -> Vec<Attribute>

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pub(crate) fn expand_cfg_attr(
&self,
attr: Attribute,
recursive: bool
) -> Vec<Attribute>

Parse and expand a single cfg_attr attribute into a list of attributes when the configuration predicate is true, or otherwise expand into an empty list of attributes.

Gives a compiler warning when the cfg_attr contains no attributes and is in the original source file. Gives a compiler error if the syntax of the attribute is incorrect.

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fn expand_cfg_attr_item(
&self,
attr: &Attribute,
(item, item_span): (AttrItem, Span)
) -> Attribute

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fn in_cfg(&self, attrs: &[Attribute]) -> bool

Determines if a node with the given attributes should be included in this configuration.

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pub(crate) fn cfg_true(&self, attr: &Attribute) -> bool

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pub(crate) fn maybe_emit_expr_attr_err(&self, attr: &Attribute)

If attributes are not allowed on expressions, emit an error for attr

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pub fn configure_expr(&self, expr: &mut P<Expr>, method_receiver: bool)

Auto Trait Implementations§

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impl<'a> !RefUnwindSafe for StripUnconfigured<'a>

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impl<'a> !Send for StripUnconfigured<'a>

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impl<'a> !Sync for StripUnconfigured<'a>

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impl<'a> Unpin for StripUnconfigured<'a>

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impl<'a> !UnwindSafe for StripUnconfigured<'a>

Blanket Implementations§

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impl<T> Any for Twhere
T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere
T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere
T: ?Sized,

const: unstable · source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere
U: From<T>,

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere
U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere
U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes