Trait GroupExt

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pub trait GroupExt:
    ProcMacroExt<GroupExt = Self>
    + Group
    + Parse<Self::TokenTree>
    + IntoTokens<Self::TokenTree>
    + ToTokens<Self::TokenTree>
    + ToTokenStream<Self::TokenStream> {
    // Required method
    fn stream_buffer(&self) -> TokenBuffer<Self::TokenTree>;

    // Provided methods
    fn with_span(
        delimiter: Self::Delimiter,
        stream: Self::TokenStream,
        span: Self::Span,
    ) -> Self { ... }
    fn delimiter_kind(&self) -> DelimiterKind { ... }
    fn flatten(&self) -> Option<Self::TokenTree> { ... }
}

Expand description

Extensions for Group.

This trait is implemented for Group in proc_macro and proc_macro2 if the corresponding feature is enabled.

Required Methods§

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fn stream_buffer(&self) -> TokenBuffer<Self::TokenTree>

Get the punctuated TokenStream as a TokenBuffer, not including delimiters.

Provided Methods§

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fn with_span( delimiter: Self::Delimiter, stream: Self::TokenStream, span: Self::Span, ) -> Self

Create a new Group with a custom span.

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fn delimiter_kind(&self) -> DelimiterKind

Get the delimiter of this Group as a matchable enum.

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fn flatten(&self) -> Option<Self::TokenTree>

If the group has delimiter None and contains a single item, extract that item, and if that item is a group, flatten that too, recursively. Then return the item, or None if the conditions weren’t met.