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use std::str::FromStr;
use {
Error,
FuzzyEq,
Result,
Stream,
WriteBuffer,
WriteOptions,
};
#[derive(Clone, Copy, Debug, PartialEq)]
#[allow(missing_docs)]
pub enum AngleUnit {
Degrees,
Gradians,
Radians,
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[allow(missing_docs)]
pub struct Angle {
pub num: f64,
pub unit: AngleUnit,
}
impl Angle {
#[inline]
pub fn new(num: f64, unit: AngleUnit) -> Angle {
Angle { num, unit }
}
}
impl FromStr for Angle {
type Err = Error;
fn from_str(text: &str) -> Result<Self> {
let mut s = Stream::from(text);
let l = s.parse_angle()?;
if !s.at_end() {
return Err(Error::UnexpectedData(s.calc_char_pos()));
}
Ok(Angle::new(l.num, l.unit))
}
}
impl WriteBuffer for Angle {
fn write_buf_opt(&self, opt: &WriteOptions, buf: &mut Vec<u8>) {
self.num.write_buf_opt(opt, buf);
let t: &[u8] = match self.unit {
AngleUnit::Degrees => b"deg",
AngleUnit::Gradians => b"grad",
AngleUnit::Radians => b"rad",
};
buf.extend_from_slice(t);
}
}
impl_display!(Angle);
impl FuzzyEq for Angle {
fn fuzzy_eq(&self, other: &Self) -> bool {
if self.unit != other.unit {
return false;
}
self.num.fuzzy_eq(&other.num)
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::str::FromStr;
macro_rules! test_p {
($name:ident, $text:expr, $result:expr) => (
#[test]
fn $name() {
assert_eq!(Angle::from_str($text).unwrap(), $result);
}
)
}
test_p!(parse_1, "1", Angle::new(1.0, AngleUnit::Degrees));
test_p!(parse_2, "1deg", Angle::new(1.0, AngleUnit::Degrees));
test_p!(parse_3, "1grad", Angle::new(1.0, AngleUnit::Gradians));
test_p!(parse_4, "1rad", Angle::new(1.0, AngleUnit::Radians));
#[test]
fn err_1() {
let mut s = Stream::from("1q");
assert_eq!(s.parse_angle().unwrap(), Angle::new(1.0, AngleUnit::Degrees));
assert_eq!(s.parse_angle().unwrap_err().to_string(),
"invalid number at position 2");
}
#[test]
fn err_2() {
assert_eq!(Angle::from_str("1degq").unwrap_err().to_string(),
"unexpected data at position 5");
}
macro_rules! test_w {
($name:ident, $len:expr, $unit:expr, $result:expr) => (
#[test]
fn $name() {
let l = Angle::new($len, $unit);
assert_eq!(l.to_string(), $result);
}
)
}
test_w!(write_1, 1.0, AngleUnit::Degrees, "1deg");
test_w!(write_2, 1.0, AngleUnit::Gradians, "1grad");
test_w!(write_3, 1.0, AngleUnit::Radians, "1rad");
}