Struct rustc_expand::config::StripUnconfigured

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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.

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§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

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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_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, Option<MetaItem>)

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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> DynSend for StripUnconfigured<'a>

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impl<'a> DynSync for StripUnconfigured<'a>

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impl<'a> Freeze for StripUnconfigured<'a>

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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>

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Size: 24 bytes