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use crate::prelude::any_value::arr_to_any_value;
use crate::prelude::*;
use crate::utils::NoNull;
macro_rules! from_iterator {
($native:ty, $variant:ident) => {
impl FromIterator<Option<$native>> for Series {
fn from_iter<I: IntoIterator<Item = Option<$native>>>(iter: I) -> Self {
let ca: ChunkedArray<$variant> = iter.into_iter().collect();
ca.into_series()
}
}
impl FromIterator<$native> for Series {
fn from_iter<I: IntoIterator<Item = $native>>(iter: I) -> Self {
let ca: NoNull<ChunkedArray<$variant>> = iter.into_iter().collect();
ca.into_inner().into_series()
}
}
impl<'a> FromIterator<&'a $native> for Series {
fn from_iter<I: IntoIterator<Item = &'a $native>>(iter: I) -> Self {
let ca: ChunkedArray<$variant> = iter.into_iter().map(|v| Some(*v)).collect();
ca.into_series()
}
}
};
}
#[cfg(feature = "dtype-u8")]
from_iterator!(u8, UInt8Type);
#[cfg(feature = "dtype-u16")]
from_iterator!(u16, UInt16Type);
from_iterator!(u32, UInt32Type);
from_iterator!(u64, UInt64Type);
#[cfg(feature = "dtype-i8")]
from_iterator!(i8, Int8Type);
#[cfg(feature = "dtype-i16")]
from_iterator!(i16, Int16Type);
from_iterator!(i32, Int32Type);
from_iterator!(i64, Int64Type);
from_iterator!(f32, Float32Type);
from_iterator!(f64, Float64Type);
from_iterator!(bool, BooleanType);
impl<'a> FromIterator<&'a str> for Series {
fn from_iter<I: IntoIterator<Item = &'a str>>(iter: I) -> Self {
let ca: Utf8Chunked = iter.into_iter().collect();
ca.into_series()
}
}
impl FromIterator<String> for Series {
fn from_iter<I: IntoIterator<Item = String>>(iter: I) -> Self {
let ca: Utf8Chunked = iter.into_iter().collect();
ca.into_series()
}
}
#[cfg(any(feature = "rows", feature = "dtype-struct"))]
impl Series {
pub fn iter(&self) -> SeriesIter<'_> {
let dtype = self.dtype();
assert_eq!(self.chunks().len(), 1, "impl error");
let arr = &*self.chunks()[0];
let len = arr.len();
SeriesIter {
arr,
dtype,
idx: 0,
len,
}
}
pub fn phys_iter(&self) -> Box<dyn ExactSizeIterator<Item = AnyValue<'_>> + '_> {
let dtype = self.dtype();
let phys_dtype = dtype.to_physical();
assert_eq!(dtype, &phys_dtype, "impl error");
assert_eq!(self.chunks().len(), 1, "impl error");
let arr = &*self.chunks()[0];
if phys_dtype.is_numeric() {
if arr.null_count() == 0 {
with_match_physical_numeric_type!(phys_dtype, |$T| {
let arr = arr.as_any().downcast_ref::<PrimitiveArray<$T>>().unwrap();
let values = arr.values().as_slice();
Box::new(values.iter().map(|&value| AnyValue::from(value))) as Box<dyn ExactSizeIterator<Item=AnyValue<'_>> + '_>
})
} else {
with_match_physical_numeric_type!(phys_dtype, |$T| {
let arr = arr.as_any().downcast_ref::<PrimitiveArray<$T>>().unwrap();
Box::new(arr.iter().map(|value| {
match value {
Some(value) => AnyValue::from(*value),
None => AnyValue::Null
}
})) as Box<dyn ExactSizeIterator<Item=AnyValue<'_>> + '_>
})
}
} else {
match dtype {
DataType::Utf8 => {
let arr = arr.as_any().downcast_ref::<Utf8Array<i64>>().unwrap();
Box::new(arr.iter().map(|value| match value {
Some(value) => AnyValue::Utf8(value),
None => AnyValue::Null,
})) as Box<dyn ExactSizeIterator<Item = AnyValue<'_>> + '_>
}
DataType::Boolean => {
let arr = arr.as_any().downcast_ref::<BooleanArray>().unwrap();
Box::new(arr.iter().map(|value| match value {
Some(value) => AnyValue::Boolean(value),
None => AnyValue::Null,
})) as Box<dyn ExactSizeIterator<Item = AnyValue<'_>> + '_>
}
_ => Box::new(self.iter()),
}
}
}
}
pub struct SeriesIter<'a> {
arr: &'a dyn Array,
dtype: &'a DataType,
idx: usize,
len: usize,
}
impl<'a> Iterator for SeriesIter<'a> {
type Item = AnyValue<'a>;
#[inline]
fn next(&mut self) -> Option<Self::Item> {
let idx = self.idx;
if idx == self.len {
None
} else {
self.idx += 1;
unsafe { Some(arr_to_any_value(self.arr, idx, self.dtype)) }
}
}
fn size_hint(&self) -> (usize, Option<usize>) {
(self.len, Some(self.len))
}
}
impl ExactSizeIterator for SeriesIter<'_> {}
#[cfg(test)]
mod test {
use crate::prelude::*;
#[test]
fn test_iter() {
let a = Series::new("age", [23, 71, 9].as_ref());
let _b = a
.i32()
.unwrap()
.into_iter()
.map(|opt_v| opt_v.map(|v| v * 2));
}
}