2022-09-27 17:58:48 +02:00
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#![doc = include_str!("../README.md")]
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2022-09-27 18:01:26 +02:00
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#![warn(
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clippy::all,
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missing_copy_implementations,
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missing_debug_implementations,
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rust_2018_idioms,
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rustdoc::broken_intra_doc_links,
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2022-09-29 19:39:13 +02:00
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trivial_casts,
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trivial_numeric_casts,
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renamed_and_removed_lints,
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unsafe_code,
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unstable_features,
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unused_import_braces,
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unused_qualifications
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)]
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#![deny(missing_docs)]
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2022-09-27 17:10:45 +02:00
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use std::fmt;
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use std::num::{ParseFloatError, ParseIntError};
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use std::str::FromStr;
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use derive_builder::Builder;
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use thiserror::Error;
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/// The scheme name of a geo URI.
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const URI_SCHEME_NAME: &str = "geo";
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/// The reference system of the provided coordinates.
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///
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/// Currently only the `WGS-84` coordinate reference system is supported.
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/// It defines the latitude and longitude of the [`GeoUri`] to be in decimal degrees and the
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/// altitude in meters.
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///
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/// For more details see the
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/// [component description](ttps://www.rfc-editor.org/rfc/rfc5870#section-3.4.2) in
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/// [RFC 5870](https://www.rfc-editor.org/rfc/rfc5870).
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#[non_exhaustive]
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub enum CrsId {
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/// The WGS-84 coordinate reference system.
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Wgs84,
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}
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impl Default for CrsId {
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fn default() -> Self {
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Self::Wgs84
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}
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}
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/// Possible geo URI parse errors.
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#[derive(Debug, Error, Eq, PartialEq)]
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pub enum ParseError {
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/// The geo URI is missing a proper scheme, i.e. the prefix `geo:`.
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#[error("Missing geo URI scheme")]
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MissingScheme,
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/// The geo URI contains no coordinates.
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#[error("Missing coordinates in geo URI")]
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MissingCoords,
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/// The geo URI lacks the latitude coordinate.
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#[error("Missing latitude coordinate in geo URI")]
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MissingLatitudeCoord,
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/// The geo URI lacks the longitude coordinate.
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#[error("Missing longitude coordinate in geo URI")]
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MissingLongitudeCoord,
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/// The geo URI contains an unparsable/invalid coordinate.
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#[error("Invalid coordinate in geo URI: {0}")]
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InvalidCoord(ParseFloatError),
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/// The geo URI contains an unsupported/invalid coordinate reference system.
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#[error("Invalid coordinate reference system")]
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InvalidCoordRefSystem,
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/// The geo URI contains an unparsable/invalid (uncertainty) distance.
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#[error("Invalid distance in geo URI: {0}")]
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InvalidDistance(ParseIntError),
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}
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/// A uniform resource identifier for geographic locations (geo URI).
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///
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/// # Examples
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///
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/// ## Parsing
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///
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/// You can get a [`GeoUri`] by converting it from a geo URI string ([`&str`]):
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///
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/// ```rust
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/// use geo_uri::GeoUri;
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///
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/// let geo_uri = GeoUri::try_from("geo:52.107,5.134,3.6;u=1000");
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/// assert!(geo_uri.is_ok());
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/// ```
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///
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/// or by using the [`TryFrom`] trait:
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/// ```
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/// use geo_uri::GeoUri;
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/// use std::str::FromStr;
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///
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/// let geo_uri = GeoUri::from_str("geo:52.107,5.134;u=2000");
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/// assert!(geo_uri.is_ok());
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/// ```
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///
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/// It is also possible to call the parse function directly:
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///
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/// ```rust
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/// use geo_uri::GeoUri;
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///
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/// let geo_uri = GeoUri::parse("geo:52.107,5.134,3.6;u=1000");
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/// assert!(geo_uri.is_ok());
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/// ```
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///
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/// ## Generating
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///
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/// To get an geo URI string from some coordinates, use the [`GeoUriBuilder`]:
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///
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/// ```rust
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/// use geo_uri::GeoUri;
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///
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/// let geo_uri = GeoUri::builder()
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/// .latitude(52.107)
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/// .longitude(5.134)
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/// .uncertainty(1_000)
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/// .build()
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/// .unwrap();
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/// assert_eq!(
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/// geo_uri.to_string(),
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/// String::from("geo:52.107,5.134;u=1000")
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/// );
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/// assert_eq!(
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/// format!("{geo_uri}"),
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/// String::from("geo:52.107,5.134;u=1000")
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/// );
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/// ```
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///
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/// # See also
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///
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/// For the proposed IEEE standard, see [RFC 5870](https://www.rfc-editor.org/rfc/rfc5870).
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#[derive(Builder, Copy, Clone, Debug, Default)]
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pub struct GeoUri {
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/// The coordinate reference system used by the coordinates of this URI.
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#[builder(default)]
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pub crs_id: CrsId,
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/// The latitude coordinate of a location.
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pub latitude: f64,
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/// The longitude coordinate of a location.
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pub longitude: f64,
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/// The altitude coordinate of a location, if provided.
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#[builder(default, setter(strip_option))]
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pub altitude: Option<f64>,
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#[builder(default, setter(strip_option))]
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/// The uncertainty around the location as a radius (distance) in meters.
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pub uncertainty: Option<u32>,
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}
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impl GeoUri {
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/// Return a builder for `GeoUri`.
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pub fn builder() -> GeoUriBuilder {
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GeoUriBuilder::default()
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}
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/// Try parsing a geo URI string into a `GeoUri`.
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///
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/// For the geo URI scheme syntax, see the propsed IEEE standard
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/// [RFC 5870](https://www.rfc-editor.org/rfc/rfc5870#section-3.3).
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pub fn parse(uri: &str) -> Result<Self, ParseError> {
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let uri_path = uri.strip_prefix("geo:").ok_or(ParseError::MissingScheme)?;
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let mut parts = uri_path.split(';');
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// Parse the coordinate part.
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let coords_part = parts.next().expect("Split always yields at least one part");
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// Don't iterate over anything if the coordinate part is empty!
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let mut coords = if coords_part.is_empty() {
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return Err(ParseError::MissingCoords);
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} else {
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coords_part.splitn(3, ',')
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};
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let latitude = coords
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.next()
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.ok_or(ParseError::MissingLatitudeCoord) // This cannot really happen
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.and_then(|lat_s| lat_s.parse().map_err(ParseError::InvalidCoord))?;
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let longitude = coords
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.next()
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.ok_or(ParseError::MissingLongitudeCoord)
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.and_then(|lon_s| lon_s.parse().map_err(ParseError::InvalidCoord))?;
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let altitude = coords
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.next()
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.map(|alt_s| alt_s.parse().map_err(ParseError::InvalidCoord))
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.transpose()?;
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// Parse the remaining (parameters) parts.
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//
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// TODO: Handle possible casing issues in the pnames.
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// TODO: Handle percent encoding of the parameters.
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//
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// If the "crs" parameter is passed, its value must be "wgs84" or it is unsupported.
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// It can be followed by a "u" parameter or that can be the first one.
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// All other parameters are ignored.
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let mut param_parts = parts.flat_map(|part| part.split_once('='));
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let (crs_id, uncertainty) = match param_parts.next() {
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Some(("crs", value)) => {
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if value.to_ascii_lowercase() != "wgs84" {
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return Err(ParseError::InvalidCoordRefSystem);
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}
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match param_parts.next() {
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Some(("u", value)) => (
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CrsId::Wgs84,
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Some(value.parse().map_err(ParseError::InvalidDistance)?),
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),
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Some(_) | None => (CrsId::Wgs84, None),
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}
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}
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Some(("u", value)) => (
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CrsId::default(),
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Some(value.parse().map_err(ParseError::InvalidDistance)?),
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),
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Some(_) | None => (CrsId::default(), None),
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};
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Ok(GeoUri {
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crs_id,
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latitude,
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longitude,
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altitude,
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uncertainty,
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})
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}
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}
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impl fmt::Display for GeoUri {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let Self {
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latitude,
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longitude,
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..
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} = self;
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write!(f, "{URI_SCHEME_NAME}:{latitude},{longitude}")?;
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if let Some(altitude) = self.altitude {
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write!(f, ",{altitude}")?;
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}
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// Don't write the CRS since there is only one supported at the moment.
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if let Some(uncertainty) = self.uncertainty {
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write!(f, ";u={uncertainty}")?;
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}
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Ok(())
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}
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}
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impl FromStr for GeoUri {
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type Err = ParseError;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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Self::parse(s)
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}
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}
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impl TryFrom<&str> for GeoUri {
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type Error = ParseError;
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fn try_from(value: &str) -> Result<Self, Self::Error> {
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Self::parse(value)
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}
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}
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impl PartialEq for GeoUri {
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fn eq(&self, other: &Self) -> bool {
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// In the WGS-84 CRS the the longitude is ignored for the poles.
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let ignore_longitude = self.crs_id == CrsId::Wgs84 && self.latitude.abs() == 90.0;
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self.crs_id == other.crs_id
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&& self.latitude == other.latitude
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&& (ignore_longitude || self.longitude == other.longitude)
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&& self.altitude == other.altitude
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&& self.uncertainty == other.uncertainty
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}
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}
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#[cfg(test)]
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mod tests {
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use float_eq::assert_float_eq;
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use super::*;
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#[test]
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fn crs_id_default() {
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assert_eq!(CrsId::default(), CrsId::Wgs84);
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}
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#[test]
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fn geo_uri_builder() {
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let builder = GeoUri::builder();
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assert!(matches!(builder, GeoUriBuilder { .. }));
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}
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#[test]
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fn geo_uri_parse() -> Result<(), ParseError> {
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let geo_uri = GeoUri::parse("geo:52.107,5.134")?;
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assert_float_eq!(geo_uri.latitude, 52.107, abs <= 0.001);
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assert_float_eq!(geo_uri.longitude, 5.134, abs <= 0.001);
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assert_eq!(geo_uri.altitude, None);
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assert_eq!(geo_uri.uncertainty, None);
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let geo_uri = GeoUri::parse("52.107,5.134");
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assert!(matches!(geo_uri, Err(ParseError::MissingScheme)));
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let geo_uri = GeoUri::parse("geo:geo:52.107,5.134");
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assert!(matches!(geo_uri, Err(ParseError::InvalidCoord(_))));
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let geo_uri = GeoUri::parse("geo:");
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assert!(matches!(geo_uri, Err(ParseError::MissingCoords)));
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let geo_uri = GeoUri::parse("geo:;u=5000");
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assert!(matches!(geo_uri, Err(ParseError::MissingCoords)));
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let geo_uri = GeoUri::parse("geo:52.107;u=1000");
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assert!(matches!(geo_uri, Err(ParseError::MissingLongitudeCoord)));
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let geo_uri = GeoUri::parse("geo:52.107,;u=1000");
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assert!(matches!(geo_uri, Err(ParseError::InvalidCoord(_))));
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let geo_uri = GeoUri::parse("geo:52.107,,6.50;u=1000");
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assert!(matches!(geo_uri, Err(ParseError::InvalidCoord(_))));
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let geo_uri = GeoUri::parse("geo:52.107,5.134,;u=1000");
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assert!(matches!(geo_uri, Err(ParseError::InvalidCoord(_))));
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let geo_uri = GeoUri::parse("geo:52.107,5.134,3.6")?;
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assert_float_eq!(geo_uri.latitude, 52.107, abs <= 0.001);
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assert_float_eq!(geo_uri.longitude, 5.134, abs <= 0.001);
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assert_float_eq!(geo_uri.altitude.unwrap(), 3.6, abs <= 0.001);
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assert_eq!(geo_uri.uncertainty, None);
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let geo_uri = GeoUri::parse("geo:52.107,5.34,3.6;u=");
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assert!(matches!(geo_uri, Err(ParseError::InvalidDistance(_))));
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let geo_uri = GeoUri::parse("geo:52.107,5.34,3.6;u=foo");
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assert!(matches!(geo_uri, Err(ParseError::InvalidDistance(_))));
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let geo_uri = GeoUri::parse("geo:52.107,5.34,3.6;crs=wgs84;u=foo");
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2022-09-27 17:10:45 +02:00
|
|
|
assert!(matches!(geo_uri, Err(ParseError::InvalidDistance(_))));
|
|
|
|
|
2022-09-29 20:22:23 +02:00
|
|
|
let geo_uri = GeoUri::parse("geo:52.107,5.134,3.6;u=25000")?;
|
2022-09-27 17:10:45 +02:00
|
|
|
assert_float_eq!(geo_uri.latitude, 52.107, abs <= 0.001);
|
|
|
|
assert_float_eq!(geo_uri.longitude, 5.134, abs <= 0.001);
|
2022-09-29 20:22:23 +02:00
|
|
|
assert_float_eq!(geo_uri.altitude.unwrap(), 3.6, abs <= 0.001);
|
2022-09-27 17:10:45 +02:00
|
|
|
assert_eq!(geo_uri.uncertainty, Some(25_000));
|
|
|
|
|
2022-09-29 20:22:23 +02:00
|
|
|
let geo_uri = GeoUri::parse("geo:52.107,5.134,3.6;crs=wgs84;u=25000")?;
|
2022-09-27 17:10:45 +02:00
|
|
|
assert_float_eq!(geo_uri.latitude, 52.107, abs <= 0.001);
|
|
|
|
assert_float_eq!(geo_uri.longitude, 5.134, abs <= 0.001);
|
2022-09-29 20:22:23 +02:00
|
|
|
assert_float_eq!(geo_uri.altitude.unwrap(), 3.6, abs <= 0.001);
|
2022-09-27 17:10:45 +02:00
|
|
|
assert_eq!(geo_uri.uncertainty, Some(25_000));
|
|
|
|
|
2022-09-29 20:22:23 +02:00
|
|
|
let geo_uri = GeoUri::parse("geo:52.107,5.134,3.6;crs=wgs84;u=25000;foo=bar")?;
|
2022-09-27 17:10:45 +02:00
|
|
|
assert_float_eq!(geo_uri.latitude, 52.107, abs <= 0.001);
|
|
|
|
assert_float_eq!(geo_uri.longitude, 5.134, abs <= 0.001);
|
2022-09-29 20:22:23 +02:00
|
|
|
assert_float_eq!(geo_uri.altitude.unwrap(), 3.6, abs <= 0.001);
|
2022-09-27 17:10:45 +02:00
|
|
|
assert_eq!(geo_uri.uncertainty, Some(25_000));
|
|
|
|
|
2022-09-29 20:22:23 +02:00
|
|
|
let geo_uri = GeoUri::parse("geo:52.107,5.34,3.6;crs=foo");
|
2022-09-27 17:10:45 +02:00
|
|
|
assert!(matches!(geo_uri, Err(ParseError::InvalidCoordRefSystem)));
|
|
|
|
|
2022-09-29 20:22:23 +02:00
|
|
|
let geo_uri = GeoUri::parse("geo:52.107,5.34,3.6;crs=wgs84")?;
|
2022-09-27 17:10:45 +02:00
|
|
|
assert!(matches!(geo_uri.crs_id, CrsId::Wgs84));
|
|
|
|
|
|
|
|
// TODO: Add exmaples from RFC 5870!
|
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
2022-09-29 20:22:23 +02:00
|
|
|
fn geo_uri_display() {
|
|
|
|
let mut geo_uri = GeoUri {
|
|
|
|
crs_id: CrsId::Wgs84,
|
|
|
|
latitude: 52.107,
|
|
|
|
longitude: 5.134,
|
|
|
|
altitude: None,
|
|
|
|
uncertainty: None,
|
|
|
|
};
|
|
|
|
assert_eq!(&geo_uri.to_string(), "geo:52.107,5.134");
|
|
|
|
|
|
|
|
geo_uri.altitude = Some(3.6);
|
|
|
|
assert_eq!(&geo_uri.to_string(), "geo:52.107,5.134,3.6");
|
|
|
|
|
|
|
|
geo_uri.uncertainty = Some(25_000);
|
|
|
|
assert_eq!(&geo_uri.to_string(), "geo:52.107,5.134,3.6;u=25000");
|
2022-09-27 17:10:45 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
2022-09-29 20:22:23 +02:00
|
|
|
fn geo_uri_from_str() -> Result<(), ParseError> {
|
|
|
|
let geo_uri = GeoUri::from_str("geo:52.107,5.134")?;
|
|
|
|
assert_float_eq!(geo_uri.latitude, 52.107, abs <= 0.001);
|
|
|
|
assert_float_eq!(geo_uri.longitude, 5.134, abs <= 0.001);
|
|
|
|
assert_eq!(geo_uri.altitude, None);
|
|
|
|
assert_eq!(geo_uri.uncertainty, None);
|
|
|
|
|
|
|
|
Ok(())
|
2022-09-27 17:10:45 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
2022-09-29 20:22:23 +02:00
|
|
|
fn geo_uri_try_from() -> Result<(), ParseError> {
|
|
|
|
let geo_uri = GeoUri::try_from("geo:52.107,5.134")?;
|
|
|
|
assert_float_eq!(geo_uri.latitude, 52.107, abs <= 0.001);
|
|
|
|
assert_float_eq!(geo_uri.longitude, 5.134, abs <= 0.001);
|
|
|
|
assert_eq!(geo_uri.altitude, None);
|
|
|
|
assert_eq!(geo_uri.uncertainty, None);
|
|
|
|
|
|
|
|
Ok(())
|
2022-09-27 17:10:45 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
2022-09-29 20:22:23 +02:00
|
|
|
fn geo_uri_partial_eq() -> Result<(), GeoUriBuilderError> {
|
|
|
|
let geo_uri = GeoUri::builder()
|
|
|
|
.latitude(52.107)
|
|
|
|
.longitude(5.134)
|
|
|
|
.build()?;
|
|
|
|
let geo_uri2 = GeoUri::builder()
|
|
|
|
.latitude(52.107)
|
|
|
|
.longitude(5.134)
|
|
|
|
.build()?;
|
|
|
|
assert_eq!(geo_uri, geo_uri2);
|
|
|
|
assert_eq!(geo_uri, geo_uri.clone());
|
|
|
|
|
|
|
|
let geo_uri = GeoUri::builder().latitude(90.0).longitude(5.134).build()?;
|
|
|
|
let geo_uri2 = GeoUri::builder().latitude(90.0).longitude(5.134).build()?;
|
|
|
|
assert_eq!(geo_uri, geo_uri2);
|
|
|
|
|
|
|
|
let geo_uri = GeoUri::builder().latitude(-90.0).longitude(5.134).build()?;
|
|
|
|
let geo_uri2 = GeoUri::builder().latitude(-90.0).longitude(5.134).build()?;
|
|
|
|
assert_eq!(geo_uri, geo_uri2);
|
|
|
|
|
|
|
|
Ok(())
|
2022-09-27 17:10:45 +02:00
|
|
|
}
|
|
|
|
}
|