vendor/winnow/examples/css/main.rs

   1 use winnow::prelude::*;
   2
   3 mod parser;
   4
   5 use parser::hex_color;
   6
   7 fn main() -> Result<(), lexopt::Error> {
   8     let args = Args::parse()?;
   9
  10     let input = args.input.as_deref().unwrap_or("#AAAAAA");
  11
  12     println!("{} =", input);
  13     match hex_color.parse(input) {
  14         Ok(result) => {
  15             println!("  {:?}", result);
  16         }
  17         Err(err) => {
  18             println!("  {}", err);
  19         }
  20     }
  21
  22     Ok(())
  23 }
  24
  25 #[derive(Default)]
  26 struct Args {
  27     input: Option<String>,
  28 }
  29
  30 impl Args {
  31     fn parse() -> Result<Self, lexopt::Error> {
  32         use lexopt::prelude::*;
  33
  34         let mut res = Args::default();
  35
  36         let mut args = lexopt::Parser::from_env();
  37         while let Some(arg) = args.next()? {
  38             match arg {
  39                 Value(input) => {
  40                     res.input = Some(input.string()?);
  41                 }
  42                 _ => return Err(arg.unexpected()),
  43             }
  44         }
  45         Ok(res)
  46     }
  47 }
  48
  49 #[test]
  50 fn parse_color() {
  51     assert_eq!(
  52         hex_color("#2F14DF"),
  53         Ok((
  54             "",
  55             parser::Color {
  56                 red: 47,
  57                 green: 20,
  58                 blue: 223,
  59             }
  60         ))
  61     );
  62 }