+#[must_use]
+pub struct Summary {
+ // Encountered e.g. an IO error.
+ has_operational_errors: bool,
+
+ // Failed to reformat code because of parsing errors.
+ has_parsing_errors: bool,
+
+ // Code is valid, but it is impossible to format it properly.
+ has_formatting_errors: bool,
+}
+
+impl Summary {
+ pub fn new() -> Summary {
+ Summary {
+ has_operational_errors: false,
+ has_parsing_errors: false,
+ has_formatting_errors: false,
+ }
+ }
+
+ pub fn has_operational_errors(&self) -> bool {
+ self.has_operational_errors
+ }
+
+ pub fn has_parsing_errors(&self) -> bool {
+ self.has_parsing_errors
+ }
+
+ pub fn has_formatting_errors(&self) -> bool {
+ self.has_formatting_errors
+ }
+
+ pub fn add_operational_error(&mut self) {
+ self.has_operational_errors = true;
+ }
+
+ pub fn add_parsing_error(&mut self) {
+ self.has_parsing_errors = true;
+ }
+
+ pub fn add_formatting_error(&mut self) {
+ self.has_formatting_errors = true;
+ }
+
+ pub fn has_no_errors(&self) -> bool {
+ !(self.has_operational_errors || self.has_parsing_errors || self.has_formatting_errors)
+ }
+
+ pub fn add(&mut self, other: Summary) {
+ self.has_operational_errors |= other.has_operational_errors;
+ self.has_formatting_errors |= other.has_formatting_errors;
+ self.has_parsing_errors |= other.has_parsing_errors;
+ }
+}