vendor/toml_edit-0.19.15/src/ser/pretty.rs

pub(crate) struct Pretty;

impl crate::visit_mut::VisitMut for Pretty {
    fn visit_document_mut(&mut self, node: &mut crate::Document) {
        crate::visit_mut::visit_document_mut(self, node);
    }

    fn visit_item_mut(&mut self, node: &mut crate::Item) {
        node.make_item();

        crate::visit_mut::visit_item_mut(self, node);
    }

    fn visit_table_mut(&mut self, node: &mut crate::Table) {
        node.decor_mut().clear();

        // Empty tables could be semantically meaningful, so make sure they are not implicit
        if !node.is_empty() {
            node.set_implicit(true);
        }

        crate::visit_mut::visit_table_mut(self, node);
    }

    fn visit_value_mut(&mut self, node: &mut crate::Value) {
        node.decor_mut().clear();

        crate::visit_mut::visit_value_mut(self, node);
    }

    fn visit_array_mut(&mut self, node: &mut crate::Array) {
        crate::visit_mut::visit_array_mut(self, node);

        if (0..=1).contains(&node.len()) {
            node.set_trailing("");
            node.set_trailing_comma(false);
        } else {
            for item in node.iter_mut() {
                item.decor_mut().set_prefix("\n    ");
            }
            node.set_trailing("\n");
            node.set_trailing_comma(true);
        }
    }
}