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Format dates and small refactors

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Richard Patching 2025-06-21 18:03:39 +01:00
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Cargo.lock generated
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@ -4,4 +4,4 @@ version = 4
[[package]]
name = "aniker-gps"
version = "0.1.0"
version = "0.1.1"

4
Cargo.toml
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@ -1,11 +1,11 @@
[package]
name = "aniker-gps"
version = "0.1.0"
version = "0.1.1"
edition = "2021"
authors = ["Richard Patching <richard@simaker.com>"]
description = "A Rust library for parsing NMEA GPS sentences"
license = "MIT OR Apache-2.0"
repository = "https://github.com/yourusername/aniker-gps"
repository = "https://code.hackmarine.com/hackmarine/aniker-gps"
readme = "README.md"
keywords = ["gps", "nmea", "parser", "navigation"]
categories = ["parsing", "science", "embedded"]

190
LICENSE Normal file
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@ -0,0 +1,190 @@
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Copyright 2024 Richard Patching
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235
src/gps.rs
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@ -16,9 +16,9 @@ const FIX_TYPE_INDEX: usize = 6;
const SATELLITES_INDEX: usize = 7;
const HDOP_INDEX: usize = 8;
const ALT_INDEX: usize = 9;
const ALT_UNITS_INDEX: usize = 10; // "M" for meters (default)
//const ALT_UNITS_INDEX: usize = 10; // "M" for meters (default)
const GEOID_SEPARATION_INDEX: usize = 11;
const GEOID_UNITS_INDEX: usize = 12;
//const GEOID_UNITS_INDEX: usize = 12;
const DIFFERENTIAL_AGE_INDEX: usize = 13;
const DIFFERENTIAL_STATION_ID_INDEX: usize = 14;
@ -154,6 +154,142 @@ pub fn parse_gga(buffer: &mut String) -> Result<Position, GpsError> {
Ok(position)
}
/// Validates if a string is a valid NMEA sentence
///
/// This function checks if the string follows the basic NMEA sentence format:
/// - Starts with '$'
/// - Contains a checksum (marked by '*')
/// - Has at least one comma (indicating fields)
/// - Has a minimum length of 6 characters
///
/// # Arguments
///
/// * `sentence` - The NMEA sentence to validate
///
/// # Returns
///
/// * `bool` - True if the sentence appears to be a valid NMEA sentence
///
/// # Example
///
/// ```
/// use aniker_gps::is_valid_nmea_sentence;
///
/// let valid_sentence = "$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47";
/// assert!(is_valid_nmea_sentence(valid_sentence));
///
/// let invalid_sentence = "Not a NMEA sentence";
/// assert!(!is_valid_nmea_sentence(invalid_sentence));
/// ```
pub fn is_valid_nmea_sentence(sentence: &str) -> bool {
// Check if sentence starts with $ and ends with * followed by checksum
if !sentence.starts_with('$') || !sentence.contains('*') {
return false;
}
// Check if sentence has at least 6 characters (minimum valid NMEA length)
if sentence.len() < 6 {
return false;
}
// Check if sentence has at least one comma (all NMEA sentences have fields)
if !sentence.contains(',') {
return false;
}
true
}
/// Parses a GLL (Geographic Position - Latitude/Longitude) NMEA sentence
///
/// This function extracts latitude and longitude from a GLL sentence.
/// The GLL sentence provides the current geographic position of the GPS receiver.
///
/// # Arguments
///
/// * `sentence` - The GLL sentence to parse
///
/// # Returns
///
/// * `Result<Position, GpsError>` - A Position struct containing the parsed coordinates,
/// or a GpsError if parsing fails
///
/// # Example
///
/// ```
/// use aniker_gps::{parse_gll, Position};
///
/// let gll_sentence = "$GPGLL,3723.2475,N,12158.3416,W,161229.487,A,A*41";
/// match parse_gll(gll_sentence) {
/// Ok(position) => {
/// println!("Latitude: {}", position.lat);
/// println!("Longitude: {}", position.long);
/// },
/// Err(e) => println!("Error parsing GLL: {:?}", e),
/// }
/// ```
pub fn parse_gll(sentence: &str) -> Result<Position, GpsError> {
if !sentence.starts_with("$GPGLL") {
return Err(GpsError::InvalidMessageType);
}
let parts: Vec<&str> = sentence.split(',').collect();
if parts.len() < 7 {
return Err(GpsError::InvalidLength);
}
// Parse latitude (DDMM.MMMM format)
let lat_str = parts[1];
if lat_str.len() < 4 {
return Err(GpsError::ParseError("Invalid latitude format"));
}
let lat_deg = lat_str[..2]
.parse::<f32>()
.map_err(|_| GpsError::ParseError("Failed to parse latitude degrees"))?;
let lat_min = lat_str[2..]
.parse::<f32>()
.map_err(|_| GpsError::ParseError("Failed to parse latitude minutes"))?;
let mut lat = lat_deg + lat_min / 60.0;
if parts[2] == "S" {
lat = -lat;
}
// Parse longitude (DDDMM.MMMM format)
let long_str = parts[3];
if long_str.len() < 5 {
return Err(GpsError::ParseError("Invalid longitude format"));
}
let long_deg = long_str[..3]
.parse::<f32>()
.map_err(|_| GpsError::ParseError("Failed to parse longitude degrees"))?;
let long_min = long_str[3..]
.parse::<f32>()
.map_err(|_| GpsError::ParseError("Failed to parse longitude minutes"))?;
let mut long = long_deg + long_min / 60.0;
if parts[4] == "W" {
long = -long;
}
Ok(Position {
lat,
long,
alt: 0.0,
altitude_unit: "M".to_string(),
time: Time::new(),
fix_type: 0,
satellites: 0,
hdop: 0.0,
geoid_separation: 0.0,
geoid_unit: "M".to_string(),
differential_age: None,
differential_station_id: None,
})
}
#[cfg(test)]
mod tests {
use super::*;
@ -381,4 +517,99 @@ mod tests {
assert_eq!(position.differential_age, Some(0.5));
assert_eq!(position.differential_station_id, Some("*7A".to_string()));
}
#[test]
fn test_valid_nmea_sentence() {
let valid_sentence = "$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47";
assert!(is_valid_nmea_sentence(valid_sentence));
}
#[test]
fn test_invalid_nmea_no_dollar() {
let invalid_sentence = "GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47";
assert!(!is_valid_nmea_sentence(invalid_sentence));
}
#[test]
fn test_invalid_nmea_no_checksum() {
let invalid_sentence = "$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,";
assert!(!is_valid_nmea_sentence(invalid_sentence));
}
#[test]
fn test_invalid_nmea_too_short() {
let invalid_sentence = "$GPGGA";
assert!(!is_valid_nmea_sentence(invalid_sentence));
}
#[test]
fn test_invalid_nmea_no_commas() {
let invalid_sentence = "$GPGGA*47";
assert!(!is_valid_nmea_sentence(invalid_sentence));
}
#[test]
fn test_valid_gll_sentence() {
let gll_sentence = "$GPGLL,3723.2475,N,12158.3416,W,161229.487,A,A*41";
let position = parse_gll(gll_sentence).unwrap();
// Expected values:
// Latitude: 37 degrees + 23.2475/60 = 37.387458
// Longitude: 121 degrees + 58.3416/60 = -121.97236 (negative because W)
assert!((position.lat - 37.387458).abs() < 0.000001);
assert!((position.long - (-121.97236)).abs() < 0.000001);
}
#[test]
fn test_gll_invalid_message_type() {
let invalid_sentence = "$GPGGA,3723.2475,N,12158.3416,W,161229.487,A,A*41";
let result = parse_gll(invalid_sentence);
assert!(result.is_err());
assert_eq!(result.unwrap_err(), GpsError::InvalidMessageType);
}
#[test]
fn test_gll_invalid_length() {
let invalid_sentence = "$GPGLL,3723.2475,N,12158.3416,W";
let result = parse_gll(invalid_sentence);
assert!(result.is_err());
assert_eq!(result.unwrap_err(), GpsError::InvalidLength);
}
#[test]
fn test_gll_invalid_latitude() {
let invalid_sentence = "$GPGLL,372,N,12158.3416,W,161229.487,A,A*41";
let result = parse_gll(invalid_sentence);
assert!(result.is_err());
match result.unwrap_err() {
GpsError::ParseError(msg) => {
assert!(msg.contains("Invalid latitude format"));
}
_ => panic!("Expected ParseError for invalid latitude"),
}
}
#[test]
fn test_gll_invalid_longitude() {
let invalid_sentence = "$GPGLL,3723.2475,N,121,W,161229.487,A,A*41";
let result = parse_gll(invalid_sentence);
assert!(result.is_err());
match result.unwrap_err() {
GpsError::ParseError(msg) => {
assert!(msg.contains("Invalid longitude format"));
}
_ => panic!("Expected ParseError for invalid longitude"),
}
}
#[test]
fn test_gll_south_west_coordinates() {
let gll_sentence = "$GPGLL,3723.2475,S,12158.3416,W,161229.487,A,A*41";
let position = parse_gll(gll_sentence).unwrap();
// Latitude should be negative (South)
assert!(position.lat < 0.0);
// Longitude should be negative (West)
assert!(position.long < 0.0);
}
}

7
src/lib.rs
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@ -71,12 +71,12 @@
//! - Checksum validation value
mod error;
mod gps;
pub mod gps;
mod position;
mod time;
pub use error::GpsError;
pub use gps::parse_gga;
pub use gps::{is_valid_nmea_sentence, parse_gga, parse_gll};
pub use position::Position;
pub use time::Time;
@ -85,3 +85,6 @@ pub use position::Position as GpsPosition;
/// Re-export the parse_gga function for convenience
pub use gps::parse_gga as parse_gps_gga;
/// Re-export the parse_gll function for convenience
pub use gps::parse_gll as parse_gps_gll;

2
src/main.rs
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@ -1,5 +1,5 @@
// Example binary demonstrating how to use the Aniker GPS library
use aniker_gps::{parse_gga, GpsError, Position};
use aniker_gps::{parse_gga, GpsError};
fn main() {
// Example NMEA GGA sentence

66
src/position.rs
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@ -35,6 +35,72 @@ impl Position {
differential_station_id: None,
}
}
/// Converts decimal degrees to degrees, minutes, and seconds
///
/// # Returns
///
/// A tuple containing (degrees, minutes, seconds)
pub fn to_dms(&self) -> (i32, i32, f32) {
let decimal_to_dms = |decimal: f32| -> (i32, i32, f32) {
let degrees = decimal.abs() as i32;
let minutes_decimal = (decimal.abs() - degrees as f32) * 60.0;
let minutes = minutes_decimal as i32;
let seconds = (minutes_decimal - minutes as f32) * 60.0;
(degrees, minutes, seconds)
};
decimal_to_dms(self.lat)
}
/// Formats the position in decimal degrees (DD) format
///
/// # Returns
///
/// A string in the format "DD.DDDDD, DD.DDDDD"
pub fn format_decimal_degrees(&self) -> String {
format!("{:.5}, {:.5}", self.lat, self.long)
}
/// Formats the position in degrees, minutes, seconds (DMS) format
///
/// # Returns
///
/// A string in the format "DD°MM'SS.S\"N/S, DDD°MM'SS.S\"E/W"
pub fn format_dms(&self) -> String {
let (lat_deg, lat_min, lat_sec) = self.to_dms();
let (long_deg, long_min, long_sec) = self.to_dms();
format!(
"{}°{}'{:.1}\"{}, {}°{}'{:.1}\"{}",
lat_deg,
lat_min,
lat_sec,
if self.lat >= 0.0 { "N" } else { "S" },
long_deg,
long_min,
long_sec,
if self.long >= 0.0 { "E" } else { "W" }
)
}
/// Formats the position in degrees and decimal minutes (DMM) format
///
/// # Returns
///
/// A string in the format "DD MM.MMMM, DDD MM.MMMM"
pub fn format_dmm(&self) -> String {
let lat_deg = self.lat.abs() as i32;
let long_deg = self.long.abs() as i32;
format!(
"{} {:.4}, {} {:.4}",
lat_deg,
(self.lat.abs() - lat_deg as f32) * 60.0,
long_deg,
(self.long.abs() - long_deg as f32) * 60.0
)
}
}
#[cfg(test)]