1 files changed, 51 insertions, 0 deletions
diff --git a/vendor/annotate-snippets/src/formatter/style.rs b/vendor/annotate-snippets/src/formatter/style.rs
new file mode 100644
index 000000000..3fc01c191
--- /dev/null
+++ b/vendor/annotate-snippets/src/formatter/style.rs
@@ -0,0 +1,51 @@
+//! Set of structures required to implement a stylesheet
+//!
+//! In order to provide additional styling information for the
+//! formatter, a structs can implement `Stylesheet` and `Style`
+//! traits.
+//!
+use std::fmt;
+
+/// StyleClass is a collection of named variants of style classes
+pub enum StyleClass {
+    /// Message indicating an error.
+    Error,
+    /// Message indicating a warning.
+    Warning,
+    /// Message indicating an information.
+    Info,
+    /// Message indicating a note.
+    Note,
+    /// Message indicating a help.
+    Help,
+
+    /// Style for line numbers.
+    LineNo,
+
+    /// Parts of the text that are to be emphasised.
+    Emphasis,
+
+    /// Parts of the text that are regular. Usually a no-op.
+    None,
+}
+
+/// This trait implements a return value for the `Stylesheet::get_style`.
+pub trait Style {
+    /// The method used to write text with formatter
+    fn paint(&self, text: &str, f: &mut fmt::Formatter<'_>) -> fmt::Result;
+    /// The method used to write display function with formatter
+    fn paint_fn<'a>(
+        &self,
+        c: Box<dyn FnOnce(&mut fmt::Formatter<'_>) -> fmt::Result + 'a>,
+        f: &mut fmt::Formatter<'_>,
+    ) -> fmt::Result;
+    /// The method used by the `Formatter` to display the message in bold font.
+    fn bold(&self) -> Box<dyn Style>;
+}
+
+/// Trait to annotate structs that can provide `Style` implementations for
+/// every `StyleClass` variant.
+pub trait Stylesheet {
+    /// Returns a `Style` implementer based on the requested `StyleClass` variant.
+    fn get_style(&self, class: StyleClass) -> Box<dyn Style>;
+}