Method into_class_set_item

regex/regex-syntax/src/ast/parse.rs:69–82

Convert this primitive into an item in a character class. If this primitive is not a legal item (i.e., an assertion or a dot), then return an error.

(
        self,
        p: &ParserI<P>,
    )

    /// If this primitive is not a legal item (i.e., an assertion or a dot),
    /// then return an error.
    fn into_class_set_item<P: Borrow<Parser>>(
        self,
        p: &ParserI<P>,
    ) -> Result<ast::ClassSetItem> {
        use ast::ClassSetItem;
        use self::Primitive::*;

        match self {
            Literal(lit) => Ok(ClassSetItem::Literal(lit)),
            Perl(cls) => Ok(ClassSetItem::Perl(cls)),
            Unicode(cls) => Ok(ClassSetItem::Unicode(cls)),
            x => Err(p.error(*x.span(), ast::ErrorKind::ClassEscapeInvalid)),
        }
    }

    /// Convert this primitive into a literal in a character class. In
    /// particular, literals are the only valid items that can appear in