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Refactoring: Use function chaining rather than matching

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This commit is contained in:
Matthias Beyer 2018-01-04 23:09:30 +01:00
parent c92e459e3a
commit 1e2ac14d3b
2 changed files with 21 additions and 30 deletions
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7
lib/entry/libimagentrygps/src/entry.rs
View file

@ -64,10 +64,9 @@ impl GPSEntry for Entry {
}
fn get_coordinates(&self) -> Result<Option<Coordinates>> {
match self.get_header().read("gps.coordinates").chain_err(|| GPSEK::HeaderWriteError) {
Ok(Some(hdr)) => Coordinates::from_value(hdr).map(Some),
Ok(None) => Ok(None),
Err(e) => Err(e),
match self.get_header().read("gps.coordinates").chain_err(|| GPSEK::HeaderWriteError)? {
Some(hdr) => Coordinates::from_value(hdr).map(Some),
None => Ok(None),
}
}

44
lib/entry/libimagentrygps/src/types.rs
View file

@ -78,31 +78,27 @@ impl Into<Value> for GPSValue {
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(|v| match *v {
Value::Integer(i) => i64_to_i8(i),
_ => Err(GPSE::from_kind(GPSEK::HeaderTypeError)),
})?,
.and_then(&int_to_appropriate_width)?,
map
.get("minutes")
.ok_or_else(|| GPSE::from_kind(GPSEK::MinutesMissing))
.and_then(|v| match *v {
Value::Integer(i) => i64_to_i8(i),
_ => Err(GPSE::from_kind(GPSEK::HeaderTypeError)),
})?,
.and_then(&int_to_appropriate_width)?,
map
.get("seconds")
.ok_or_else(|| GPSE::from_kind(GPSEK::SecondsMissing))
.and_then(|v| match *v {
Value::Integer(i) => i64_to_i8(i),
_ => Err(GPSE::from_kind(GPSEK::HeaderTypeError)),
})?
.and_then(&int_to_appropriate_width)?
))
}
_ => Err(GPSE::from_kind(GPSEK::TypeError))
@ -154,22 +150,18 @@ impl Into<Value> for Coordinates {
impl FromValue for Coordinates {
fn from_value(v: &Value) -> Result<Self> {
match *v {
Value::Table(ref map) => {
Ok(Coordinates::new(
match map.get("longitude") {
Some(v) => GPSValue::from_value(v),
None => Err(GPSE::from_kind(GPSEK::LongitudeMissing)),
}?,
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)
};
match map.get("latitude") {
Some(v) => GPSValue::from_value(v),
None => Err(GPSE::from_kind(GPSEK::LongitudeMissing)),
}?
Ok(Coordinates::new(
get(t, "longitude", GPSEK::LongitudeMissing)?,
get(t, "latitude", GPSEK::LatitudeMissing)?
))
}
_ => Err(GPSE::from_kind(GPSEK::TypeError))
}
})
}
}