Method into_ast

regex/regex-syntax/src/ast/mod.rs:575–581

Return this alternation as an AST. If this alternation contains zero ASTs, then Ast::Empty is returned. If this alternation contains exactly 1 AST, then the corresponding AST is returned. Otherwise, Ast::Alternation is returned.

(mut self)

    /// returned. If this alternation contains exactly 1 AST, then the
    /// corresponding AST is returned. Otherwise, Ast::Alternation is returned.
    pub fn into_ast(mut self) -> Ast {
        match self.asts.len() {
            0 => Ast::Empty(self.span),
            1 => self.asts.pop().unwrap(),
            _ => Ast::Alternation(self),
        }
    }
}

/// A concatenation of regular expressions.