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use crate::{point::Format, Error, Feature, Result};
use std::fmt;
/// LAS version.
///
/// Defaults to 1.2.
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Version {
/// The major version.
///
/// Should always be 1.
pub major: u8,
/// The minor version.
///
/// Should be between 0 and 4.
pub minor: u8,
}
impl Version {
/// Creates a new version.
///
/// Doesn't do any checking that its an actual las version
///
/// # Examples
///
/// ```
/// use las::Version;
/// let version = Version::new(1, 2);
/// ```
pub fn new(major: u8, minor: u8) -> Version {
Version { major, minor }
}
/// Does this version require the point data start signature?
///
/// Only 1.0 does.
///
/// ```
/// use las::Version;
/// assert!(Version::new(1, 0).requires_point_data_start_signature());
/// assert!(!Version::new(1, 1).requires_point_data_start_signature());
/// ```
pub fn requires_point_data_start_signature(&self) -> bool {
self == &Version::new(1, 0)
}
/// Returns this version's header size.
///
/// # Examples
///
/// ```
/// use las::Version;
/// assert_eq!(227, Version::new(1, 2).header_size());
/// assert_eq!(235, Version::new(1, 3).header_size());
/// assert_eq!(375, Version::new(1, 4).header_size());
/// ```
pub fn header_size(&self) -> u16 {
if self <= &Version::new(1, 2) {
227
} else if self == &Version::new(1, 3) {
235
} else {
375
}
}
/// Checks whether this version supports the feature, returning an error if not.
///
/// # Examples
///
/// ```
/// use las::Version;
/// use las::feature::Waveforms;
/// Version::new(1, 4).verify_support_for::<Waveforms>().unwrap();
/// assert!(Version::new(1, 2).verify_support_for::<Waveforms>().is_err());
/// ```
pub fn verify_support_for<F: Feature>(&self) -> Result<()> {
if self.supports::<F>() {
Ok(())
} else {
Err(Error::UnsupportedFeature {
version: *self,
feature: F::name(),
})
}
}
/// Checks whether this version supports the feature.
///
/// # Examples
///
/// ```
/// use las::Version;
/// use las::feature::Waveforms;
/// assert!(Version::new(1, 4).supports::<Waveforms>());
/// assert!(!Version::new(1, 2).supports::<Waveforms>());
/// ```
pub fn supports<F: Feature>(&self) -> bool {
F::is_supported_by(*self)
}
/// Checks whether this version supports the given point format.
///
/// # Examples
///
/// ```
/// use las::Version;
/// use las::point::Format;
/// let las_1_2 = Version::new(1, 2);
/// let las_1_4 = Version::new(1, 4);
/// assert!(las_1_2.supports_point_format(Format::new(3).unwrap()));
/// assert!(!las_1_2.supports_point_format(Format::new(4).unwrap()));
/// assert!(las_1_4.supports_point_format(Format::new(4).unwrap()));
/// ```
pub fn supports_point_format(&self, format: Format) -> bool {
if self.major != 1 {
return false;
}
match self.minor {
0 | 1 => {
!(format.has_color || format.is_extended || format.has_waveform || format.has_nir)
}
2 => !(format.is_extended || format.has_waveform || format.has_nir),
3 => !(format.is_extended || format.has_nir),
4 => true,
_ => false,
}
}
}
impl Default for Version {
fn default() -> Version {
Version { major: 1, minor: 2 }
}
}
impl fmt::Display for Version {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}.{}", self.major, self.minor)
}
}
impl From<(u8, u8)> for Version {
fn from((major, minor): (u8, u8)) -> Version {
Version { major, minor }
}
}
impl From<Version> for (u8, u8) {
fn from(version: Version) -> (u8, u8) {
(version.major, version.minor)
}
}
#[cfg(test)]
mod tests {
use super::*;
macro_rules! version {
($name:ident, $major:expr_2021, $minor:expr_2021, $supports:expr_2021, $max_point_format:expr_2021) => {
mod $name {
use super::*;
use crate::feature::*;
#[test]
fn features() {
let version = Version::new($major, $minor);
assert_eq!($supports[0], version.supports::<FileSourceId>());
assert_eq!($supports[1], version.supports::<GpsStandardTime>());
assert_eq!($supports[2], version.supports::<Waveforms>());
assert_eq!($supports[3], version.supports::<LargeFiles>());
assert_eq!($supports[4], version.supports::<Evlrs>());
}
#[test]
fn point_formats() {
let version = Version::new($major, $minor);
for n in 0i8..11 {
let format = Format::new(n as u8).unwrap();
if n <= $max_point_format {
assert!(version.supports_point_format(format));
} else {
assert!(!version.supports_point_format(format));
}
}
}
}
};
}
version!(las_1_0, 1, 0, [false; 5], 1);
version!(las_1_1, 1, 1, [true, false, false, false, false], 1);
version!(las_1_2, 1, 2, [true, true, false, false, false], 3);
version!(las_1_3, 1, 3, [true, true, true, false, false], 5);
version!(las_1_4, 1, 4, [true; 5], 10);
version!(las_1_5, 1, 5, [false; 5], -1);
version!(las_2_0, 2, 0, [false; 5], -1);
}