1 files changed, 51 insertions, 0 deletions
diff --git a/third_party/rust/nom/tests/css.rs b/third_party/rust/nom/tests/css.rs
new file mode 100644
index 0000000000..0ce7e77b05
--- /dev/null
+++ b/third_party/rust/nom/tests/css.rs
@@ -0,0 +1,51 @@
+extern crate nom;
+
+use nom::IResult;
+use nom::bytes::complete::{tag, take_while_m_n};
+use nom::combinator::map_res;
+use nom::sequence::tuple;
+
+#[derive(Debug, PartialEq)]
+pub struct Color {
+  pub red: u8,
+  pub green: u8,
+  pub blue: u8,
+}
+
+fn from_hex(input: &str) -> Result<u8, std::num::ParseIntError> {
+  u8::from_str_radix(input, 16)
+}
+
+fn is_hex_digit(c: char) -> bool {
+  c.is_digit(16)
+}
+
+fn hex_primary(input: &str) -> IResult<&str, u8> {
+  map_res(
+    take_while_m_n(2, 2, is_hex_digit),
+    from_hex
+  )(input)
+}
+
+fn hex_color(input: &str) -> IResult<&str, Color> {
+  let (input, _) = tag("#")(input)?;
+  let (input, (red, green, blue)) = tuple((hex_primary, hex_primary, hex_primary))(input)?;
+
+  Ok((input, Color { red, green, blue }))
+}
+
+
+#[test]
+fn parse_color() {
+  assert_eq!(
+    hex_color("#2F14DF"),
+    Ok((
+      "",
+      Color {
+        red: 47,
+        green: 20,
+        blue: 223,
+      }
+    ))
+  );
+}