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//! Parser for the `stroke-dasharray` property.
use cssparser::Parser;
use crate::error::*;
use crate::length::*;
use crate::parsers::{optional_comma, Parse};
#[derive(Debug, PartialEq, Clone)]
pub enum Dasharray {
None,
Array(Box<[ULength<Both>]>),
}
enum_default!(Dasharray, Dasharray::None);
impl Parse for Dasharray {
fn parse<'i>(parser: &mut Parser<'i, '_>) -> Result<Dasharray, ParseError<'i>> {
if parser
.try_parse(|p| p.expect_ident_matching("none"))
.is_ok()
{
return Ok(Dasharray::None);
}
let mut dasharray = Vec::new();
loop {
let d = ULength::<Both>::parse(parser)?;
dasharray.push(d);
if parser.is_exhausted() {
break;
}
optional_comma(parser);
}
Ok(Dasharray::Array(dasharray.into_boxed_slice()))
}
}
#[cfg(test)]
mod tests {
use super::*;
fn dasharray(l: &[ULength<Both>]) -> Dasharray {
Dasharray::Array(
l.iter()
.cloned()
.collect::<Vec<ULength<Both>>>()
.into_boxed_slice(),
)
}
#[test]
fn parses_dash_array() {
// helper to cut down boilderplate
let length_parse = |s| ULength::<Both>::parse_str(s).unwrap();
let expected = dasharray(&[
length_parse("1"),
length_parse("2in"),
length_parse("3"),
length_parse("4%"),
]);
let sample_1 = dasharray(&[length_parse("10"), length_parse("6")]);
let sample_2 = dasharray(&[length_parse("5"), length_parse("5"), length_parse("20")]);
let sample_3 = dasharray(&[
length_parse("10px"),
length_parse("20px"),
length_parse("20px"),
]);
let sample_4 = dasharray(&[
length_parse("25"),
length_parse("5"),
length_parse("5"),
length_parse("5"),
]);
let sample_5 = dasharray(&[length_parse("3.1415926"), length_parse("8")]);
let sample_6 = dasharray(&[length_parse("5"), length_parse("3.14")]);
let sample_7 = dasharray(&[length_parse("2")]);
assert_eq!(Dasharray::parse_str("none").unwrap(), Dasharray::None);
assert_eq!(Dasharray::parse_str("1 2in,3 4%").unwrap(), expected);
assert_eq!(Dasharray::parse_str("10,6").unwrap(), sample_1);
assert_eq!(Dasharray::parse_str("5,5,20").unwrap(), sample_2);
assert_eq!(Dasharray::parse_str("10px 20px 20px").unwrap(), sample_3);
assert_eq!(Dasharray::parse_str("25 5 , 5 5").unwrap(), sample_4);
assert_eq!(Dasharray::parse_str("3.1415926,8").unwrap(), sample_5);
assert_eq!(Dasharray::parse_str("5, 3.14").unwrap(), sample_6);
assert_eq!(Dasharray::parse_str("2").unwrap(), sample_7);
// Negative numbers
assert!(Dasharray::parse_str("20,40,-20").is_err());
// Empty dash_array
assert!(Dasharray::parse_str("").is_err());
assert!(Dasharray::parse_str("\t \n ").is_err());
assert!(Dasharray::parse_str(",,,").is_err());
assert!(Dasharray::parse_str("10, \t, 20 \n").is_err());
// No trailing commas allowed, parse error
assert!(Dasharray::parse_str("10,").is_err());
// A comma should be followed by a number
assert!(Dasharray::parse_str("20,,10").is_err());
}
}
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