1 #[derive(Copy, Clone, Default)]
2 pub(crate) struct DocumentFormatter {
3     pub(crate) multiline_array: bool,
4     is_value: bool,
5 }
6 
7 impl toml_edit::visit_mut::VisitMut for DocumentFormatter {
visit_document_mut(&mut self, node: &mut toml_edit::Document)8     fn visit_document_mut(&mut self, node: &mut toml_edit::Document) {
9         toml_edit::visit_mut::visit_document_mut(self, node);
10     }
11 
visit_item_mut(&mut self, node: &mut toml_edit::Item)12     fn visit_item_mut(&mut self, node: &mut toml_edit::Item) {
13         let is_parent_value = self.is_value;
14         if !is_parent_value {
15             let other = std::mem::take(node);
16             let other = match other.into_table().map(toml_edit::Item::Table) {
17                 Ok(i) => i,
18                 Err(i) => i,
19             };
20             let other = match other
21                 .into_array_of_tables()
22                 .map(toml_edit::Item::ArrayOfTables)
23             {
24                 Ok(i) => i,
25                 Err(i) => i,
26             };
27             self.is_value = other.is_value();
28             *node = other;
29         }
30 
31         toml_edit::visit_mut::visit_item_mut(self, node);
32         self.is_value = is_parent_value;
33     }
34 
visit_table_mut(&mut self, node: &mut toml_edit::Table)35     fn visit_table_mut(&mut self, node: &mut toml_edit::Table) {
36         node.decor_mut().clear();
37 
38         // Empty tables could be semantically meaningful, so make sure they are not implicit
39         if !node.is_empty() {
40             node.set_implicit(true);
41         }
42 
43         toml_edit::visit_mut::visit_table_mut(self, node);
44     }
45 
visit_value_mut(&mut self, node: &mut toml_edit::Value)46     fn visit_value_mut(&mut self, node: &mut toml_edit::Value) {
47         node.decor_mut().clear();
48 
49         toml_edit::visit_mut::visit_value_mut(self, node);
50     }
51 
visit_array_mut(&mut self, node: &mut toml_edit::Array)52     fn visit_array_mut(&mut self, node: &mut toml_edit::Array) {
53         toml_edit::visit_mut::visit_array_mut(self, node);
54 
55         if !self.multiline_array || (0..=1).contains(&node.len()) {
56             node.set_trailing("");
57             node.set_trailing_comma(false);
58         } else {
59             for item in node.iter_mut() {
60                 item.decor_mut().set_prefix("\n    ");
61             }
62             node.set_trailing("\n");
63             node.set_trailing_comma(true);
64         }
65     }
66 }
67