example.rs

    pub fn parse(args: &[Value]) -> Option<PageFilterOrSet> {
        // TODO: Error handling
        let and_groups = args
            .iter()
            .filter_map(|ag| {
                if let Ok(and_iter) = ag.try_iter() {
                    Some(PageFilterAndGroup {
                        filters: and_iter
                            .into_iter()
                            .filter_map(|filter_string| {
                                if let Some(text) = filter_string.as_str() {
                                    PageFilter::parse(text)
                                } else {
                                    None
                                }
                            })
                            .collect::<Vec<PageFilter>>(),
                    })
                } else {
                    None
                }
            })
            .collect();
        Some(PageFilterOrSet { and_groups })
    }