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use std::collections::BTreeMap;
use std::fmt::Display;
use std::fmt::Formatter;
use std::fmt::Result as FmtResult;
use toml::Value;
use error::GPSErrorKind as GPSEK;
use error::GPSError as GPSE;
use error::Result;
pub trait FromValue : Sized {
fn from_value(v: &Value) -> Result<Self>;
}
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
pub struct GPSValue {
pub degree: i8,
pub minutes: i8,
pub seconds: i8
}
impl GPSValue {
pub fn new(d: i8, m: i8, s: i8) -> GPSValue {
GPSValue {
degree: d,
minutes: m,
seconds: s
}
}
pub fn degree(&self) -> i8 {
self.degree
}
pub fn minutes(&self) -> i8 {
self.minutes
}
pub fn seconds(&self) -> i8 {
self.seconds
}
}
impl Into<Value> for GPSValue {
fn into(self) -> Value {
let mut map = BTreeMap::new();
let _ = map.insert("degree".to_owned(), Value::Integer(self.degree as i64));
let _ = map.insert("minutes".to_owned(), Value::Integer(self.minutes as i64));
let _ = map.insert("seconds".to_owned(), Value::Integer(self.seconds as i64));
Value::Table(map)
}
}
impl FromValue for GPSValue {
fn from_value(v: &Value) -> Result<Self> {
let int_to_appropriate_width = |v: &Value| {
v.as_integer()
.ok_or(GPSE::from_kind(GPSEK::HeaderTypeError)).and_then(i64_to_i8)
};
match *v {
Value::Table(ref map) => {
Ok(GPSValue::new(
map.get("degree")
.ok_or_else(|| GPSE::from_kind(GPSEK::DegreeMissing))
.and_then(&int_to_appropriate_width)?,
map
.get("minutes")
.ok_or_else(|| GPSE::from_kind(GPSEK::MinutesMissing))
.and_then(&int_to_appropriate_width)?,
map
.get("seconds")
.ok_or_else(|| GPSE::from_kind(GPSEK::SecondsMissing))
.and_then(&int_to_appropriate_width)?
))
}
_ => Err(GPSE::from_kind(GPSEK::TypeError))
}
}
}
impl Display for GPSValue {
fn fmt(&self, f: &mut Formatter) -> FmtResult {
write!(f, "{}° {}\" {}'", self.degree, self.minutes, self.seconds)
}
}
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
pub struct Coordinates {
pub longitude: GPSValue,
pub latitude: GPSValue,
}
impl Coordinates {
pub fn new(long: GPSValue, lat: GPSValue) -> Coordinates {
Coordinates {
longitude: long,
latitude: lat,
}
}
pub fn longitude(&self) -> &GPSValue {
&self.longitude
}
pub fn latitude(&self) -> &GPSValue {
&self.latitude
}
}
impl Into<Value> for Coordinates {
fn into(self) -> Value {
let mut map = BTreeMap::new();
let _ = map.insert("longitude".to_owned(), self.longitude.into());
let _ = map.insert("latitude".to_owned(), self.latitude.into());
Value::Table(map)
}
}
impl FromValue for Coordinates {
fn from_value(v: &Value) -> Result<Self> {
v.as_table()
.ok_or(GPSE::from_kind(GPSEK::TypeError))
.and_then(|t| {
let get = |m: &BTreeMap<_, _>, what: &'static str, ek| -> Result<GPSValue> {
m.get(what).ok_or(GPSE::from_kind(ek)).and_then(GPSValue::from_value)
};
Ok(Coordinates::new(
get(t, "longitude", GPSEK::LongitudeMissing)?,
get(t, "latitude", GPSEK::LatitudeMissing)?
))
})
}
}
impl Display for Coordinates {
fn fmt(&self, f: &mut Formatter) -> FmtResult {
write!(f, "longitude = {}\nlatitude = {}", self.longitude, self.latitude)
}
}
fn i64_to_i8(i: i64) -> Result<i8> {
if i > (<i8>::max_value() as i64) {
Err(GPSE::from_kind(GPSEK::NumberConversionError))
} else {
Ok(i as i8)
}
}