agg: fix typo, add docs

Cargo.lock

@@ -4,4 +4,4 @@ version = 3
 
 [[package]]
 name = "estring"
-version = "0.3.0"
+version = "0.2.1"

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "estring"
 description = "A simple way to parse a string using type annotations"
-version = "0.3.0"
+version = "0.2.1"
 edition = "2021"
 authors = ["Dmitriy Pleshevskiy <dmitriy@ideascup.me>"]
 readme = "README.md"
@@ -28,7 +28,7 @@ maintenance = { status = "actively-developed" }
 
 [[example]]
 name = "calc"
-required-features = ["structs", "aggs"]
+required-features = ["structs"]
 
 [[example]]
 name = "dotenv"

README.md

@@ -7,7 +7,7 @@
 
 ```toml
 [dependencies]
-estring = "0.3"
+estring = "0.2"
 ```
 
 A simple way to parse a string using type annotations.
@@ -24,23 +24,6 @@ For more details, see [examples].
 
 ## Usage
 
-Basic
-
-```rust
-use estring::EString;
-
-fn main() -> estring::Result<()> {
-    let res: i32 = EString::from("10").parse()?;
-    assert_eq!(res, 10);
-    Ok(())
-}
-```
-
-You can use predefined structs like `SepVec` if you enable the `structs`
-feature.
-
-Note: You can use custom types as annotations! Just implement `ParseFragment`!
-
 ```rust
 use estring::{SepVec, EString};
 
@@ -59,23 +42,8 @@ fn main() -> estring::Result<()> {
 }
 ```
 
-You can also use predefined aggregators if you enable the `aggs` feature.
-
-```rust
-use estring::{Aggregate, EString, Product, SepVec, Sum};
-
-type PlusVec<T> = SepVec<T, '+'>;
-type MulVec<T> = SepVec<T, '*'>;
-
-fn main() -> estring::Result<()> {
-    let res = EString::from("10+5*2+3")
-        .parse::<Sum<PlusVec<Product<MulVec<f32>>>>>()?
-        .agg();
-
-    assert_eq!(res, 23.0);
-    Ok(())
-}
-```
+You can use custom types as annotations! Just implement
+`estring::ParseFragment`!
 
 ## Contact Us
 

examples/calc.rs

@@ -1,12 +1,14 @@
-use estring::{Aggregate, EString, Product, SepVec, Sum};
+use estring::{EString, SepVec};
 
 type PlusVec<T> = SepVec<T, '+'>;
 type MulVec<T> = SepVec<T, '*'>;
 
 fn main() -> estring::Result<()> {
     let res = EString::from("10+5*2+3")
-        .parse::<Sum<PlusVec<Product<MulVec<f32>>>>>()?
-        .agg();
+        .parse::<PlusVec<MulVec<f32>>>()?
+        .iter()
+        .map(|m| m.iter().product::<f32>())
+        .sum::<f32>();
 
     assert_eq!(res, 23.0);
     Ok(())

src/agg.rs

@@ -1,8 +1,6 @@
 //! This module will contain aggregate functions (Sum, Product, etc)
 //!
 
-mod product;
 mod sum;
 
-pub use product::*;
 pub use sum::*;

src/agg/product.rs

@@ -1,92 +0,0 @@
-use crate::{Aggregatable, Aggregate, EString, ParseFragment};
-
-/// Aggregate struct, that can multiply inner aggregatable [items](Aggregatable::items) if
-/// [``Aggregatable::Item``] implements [``std::iter::Product``](std::iter::Product)
-///
-/// # Examples
-///
-/// ```rust
-/// use estring::{Aggregate, EString, SepVec, Product};
-/// let res = EString::from("1*2*3*4")
-///     .parse::<Product<SepVec<i32, '*'>>>()
-///     .unwrap()
-///     .agg();
-/// assert_eq!(res, 24);
-/// ```
-#[derive(Debug, PartialEq, Eq)]
-pub struct Product<T>(pub T);
-
-impl<T> ParseFragment for Product<T>
-where
-    T: ParseFragment,
-{
-    fn parse_frag(es: EString) -> crate::Result<Self> {
-        T::parse_frag(es).map(Self)
-    }
-}
-
-impl<R, T> Aggregate for Product<T>
-where
-    R: std::iter::Product,
-    T: Aggregatable<Item = R>,
-{
-    type Target = R;
-
-    fn agg(self) -> Self::Target {
-        self.0.items().into_iter().product()
-    }
-}
-
-impl<R, T> Aggregatable for Product<T>
-where
-    R: std::iter::Product,
-    T: Aggregatable<Item = R>,
-{
-    type Item = R;
-
-    fn items(self) -> Vec<Self::Item> {
-        vec![self.agg()]
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::SepVec;
-
-    use super::*;
-
-    type CommaVec<T> = SepVec<T, ','>;
-    type MulVec<T> = SepVec<T, '*'>;
-
-    #[test]
-    fn should_parse_vec() {
-        let es = EString::from("1,2,3");
-        match es.parse::<Product<CommaVec<i32>>>() {
-            Ok(res) => assert_eq!(res, Product(CommaVec::from(vec![1, 2, 3]))),
-            _ => unreachable!(),
-        }
-    }
-
-    #[test]
-    fn should_aggregate_vector() {
-        let es = EString::from("1,2,3");
-        let expr = es.parse::<Product<CommaVec<i32>>>().unwrap();
-        assert_eq!(expr.agg(), 6);
-    }
-
-    #[test]
-    fn should_aggregate_vector_with_inner_vector() {
-        let es = EString::from("1*2,2,3");
-        let expr = es.parse::<Product<CommaVec<MulVec<i32>>>>().unwrap();
-        assert_eq!(expr.agg(), 12);
-    }
-
-    #[test]
-    fn should_aggregate_vector_with_inner_aggregation() {
-        let es = EString::from("1*2,2,3");
-        let expr = es
-            .parse::<Product<CommaVec<Product<MulVec<i32>>>>>()
-            .unwrap();
-        assert_eq!(expr.agg(), 12);
-    }
-}

src/agg/sum.rs

@@ -1,31 +1,26 @@
+use std::marker::PhantomData;
+
 use crate::{Aggregatable, Aggregate, EString, ParseFragment};
 
-/// Aggregate struct, that can sum inner aggregatable [items](Aggregatable::items) if
-/// [``Aggregatable::Item``] implements [``std::iter::Sum``](std::iter::Sum)
-///
-/// # Examples
-///
-/// ```rust
-/// use estring::{Aggregate, EString, SepVec, Sum};
-/// let res = EString::from("1+2+3+4")
-///     .parse::<Sum<SepVec<i32, '+'>>>()
-///     .unwrap()
-///     .agg();
-/// assert_eq!(res, 10);
-/// ```
 #[derive(Debug, PartialEq, Eq)]
-pub struct Sum<T>(pub T);
+struct Sum<R, T>(T, PhantomData<R>);
 
-impl<T> ParseFragment for Sum<T>
+impl<R, T> Sum<R, T> {
+    fn new(inner: T) -> Self {
+        Self(inner, PhantomData::default())
+    }
+}
+
+impl<R, T> ParseFragment for Sum<R, T>
 where
     T: ParseFragment,
 {
     fn parse_frag(es: EString) -> crate::Result<Self> {
-        T::parse_frag(es).map(Self)
+        T::parse_frag(es).map(Self::new)
     }
 }
 
-impl<R, T> Aggregate for Sum<T>
+impl<R, T> Aggregate for Sum<R, T>
 where
     R: std::iter::Sum,
     T: Aggregatable<Item = R>,
@@ -37,7 +32,7 @@ where
     }
 }
 
-impl<R, T> Aggregatable for Sum<T>
+impl<R, T> Aggregatable for Sum<R, T>
 where
     R: std::iter::Sum,
     T: Aggregatable<Item = R>,
@@ -61,8 +56,8 @@ mod tests {
     #[test]
     fn should_parse_vec() {
         let es = EString::from("1,2,3");
-        match es.parse::<Sum<CommaVec<i32>>>() {
-            Ok(res) => assert_eq!(res, Sum(CommaVec::from(vec![1, 2, 3]))),
+        match es.parse::<Sum<i32, CommaVec<i32>>>() {
+            Ok(res) => assert_eq!(res, Sum::new(CommaVec::from(vec![1, 2, 3]))),
             _ => unreachable!(),
         }
     }
@@ -70,21 +65,23 @@ mod tests {
     #[test]
     fn should_aggregate_vector() {
         let es = EString::from("1,2,3");
-        let expr = es.parse::<Sum<CommaVec<i32>>>().unwrap();
+        let expr = es.parse::<Sum<i32, CommaVec<i32>>>().unwrap();
         assert_eq!(expr.agg(), 6);
     }
 
     #[test]
     fn should_aggregate_vector_with_inner_vector() {
         let es = EString::from("1+2,2,3");
-        let expr = es.parse::<Sum<CommaVec<PlusVec<i32>>>>().unwrap();
+        let expr = es.parse::<Sum<i32, CommaVec<PlusVec<i32>>>>().unwrap();
         assert_eq!(expr.agg(), 8);
     }
 
     #[test]
     fn should_aggregate_vector_with_inner_aggregation() {
         let es = EString::from("1+2,2,3");
-        let expr = es.parse::<Sum<CommaVec<Sum<PlusVec<i32>>>>>().unwrap();
+        let expr = es
+            .parse::<Sum<_, CommaVec<Sum<_, PlusVec<i32>>>>>()
+            .unwrap();
         assert_eq!(expr.agg(), 8);
     }
 }

src/core.rs

@@ -240,7 +240,6 @@ impl ParseFragment for EString {
     }
 }
 
-#[cfg(feature = "aggs")]
 impl Aggregatable for EString {
     type Item = Self;
 
@@ -264,7 +263,6 @@ impl ToEString for String {
     }
 }
 
-#[cfg(feature = "aggs")]
 impl Aggregatable for String {
     type Item = Self;
 
@@ -288,7 +286,6 @@ impl<'a> ToEString for &'a str {
     }
 }
 
-#[cfg(feature = "aggs")]
 impl<'a> Aggregatable for &'a str {
     type Item = Self;
 

src/lib.rs

@@ -7,23 +7,7 @@
 //!
 //! [enve]: https://github.com/pleshevskiy/enve
 //!
-//! ## Usage
-//!
-//! Basic
-//!
-//! ```rust
-//! use estring::EString;
-//!
-//! fn main() -> estring::Result<()> {
-//!     let res: i32 = EString::from("10").parse()?;
-//!     assert_eq!(res, 10);
-//!     Ok(())
-//! }
-//! ```
-//!
-//! You can use predefined structs like ``SepVec`` if you enable `structs` feature.
-//!
-//! Note: You can use custom types as annotations! Just implement ``ParseFragment``!
+//! ## Getting started
 //!
 //! ```rust
 //! use estring::{SepVec, EString};
@@ -43,30 +27,6 @@
 //! }
 //! ```
 //!
-//! You can also use predefined aggregators if you enable `aggs` feature.
-//!
-//! ```rust
-//! use estring::{Aggregate, EString, Product, SepVec, Sum};
-//!
-//! type PlusVec<T> = SepVec<T, '+'>;
-//! type MulVec<T> = SepVec<T, '*'>;
-//!
-//! fn main() -> estring::Result<()> {
-//!     let res = EString::from("10+5*2+3")
-//!         .parse::<Sum<PlusVec<Product<MulVec<f32>>>>>()?
-//!         .agg();
-//!
-//!     assert_eq!(res, 23.0);
-//!     Ok(())
-//! }
-//! ```
-//!
-//! ---
-//!
-//! For more details, see [examples].
-//!
-//! [examples]: https://github.com/pleshevskiy/estring/tree/main/examples
-//!
 #![deny(clippy::pedantic)]
 #![allow(clippy::module_name_repetitions)]
 #![warn(missing_docs)]

src/std/bool.rs

@@ -1,4 +1,4 @@
-use crate::core::{EString, ParseFragment, ToEString};
+use crate::core::{Aggregatable, EString, ParseFragment, ToEString};
 use crate::error::{Error, Reason};
 
 impl ParseFragment for bool {
@@ -19,8 +19,7 @@ impl ToEString for bool {
     }
 }
 
-#[cfg(feature = "aggs")]
-impl crate::core::Aggregatable for bool {
+impl Aggregatable for bool {
     type Item = Self;
 
     #[inline]

src/std/number.rs

@@ -1,4 +1,4 @@
-use crate::core::{EString, ParseFragment, ToEString};
+use crate::core::{Aggregatable, EString, ParseFragment, ToEString};
 use crate::error::{Error, Reason};
 
 #[doc(hidden)]
@@ -19,8 +19,7 @@ macro_rules! from_env_string_numbers_impl {
                 }
             }
 
-            #[cfg(feature = "aggs")]
-            impl crate::core::Aggregatable for $ty {
+            impl Aggregatable for $ty {
                 type Item = Self;
 
                 #[inline]

src/std/option.rs

@@ -1,4 +1,4 @@
-use crate::core::{EString, ParseFragment, ToEString};
+use crate::core::{Aggregatable, EString, ParseFragment, ToEString};
 
 impl<T> ToEString for Option<T>
 where
@@ -25,10 +25,9 @@ where
     }
 }
 
-#[cfg(feature = "aggs")]
-impl<T> crate::core::Aggregatable for Option<T>
+impl<T> Aggregatable for Option<T>
 where
-    T: crate::core::Aggregatable,
+    T: Aggregatable,
 {
     type Item = T::Item;
 

src/structs/pair.rs

@@ -118,7 +118,7 @@ hello=bar",
     #[test]
     fn should_format_pair() {
         let pair = Pair::<_, '+', _>(1, 2);
-        assert_eq!(pair.to_estring(), EString(String::from("1+2")));
+        assert_eq!(pair.clone().to_estring(), EString(String::from("1+2")));
         let pair_in_pair = Pair::<_, '=', _>(3, pair);
         assert_eq!(pair_in_pair.to_estring(), EString(String::from("3=1+2")));
     }

src/structs/sep_vec.rs

@@ -1,7 +1,7 @@
 //! Contains the implementations to vec type
 //!
 
-use crate::core::{EString, ParseFragment, ToEString};
+use crate::core::{Aggregatable, EString, ParseFragment, ToEString};
 use std::fmt::Write;
 
 /// Wrapper for ``Vec`` to split string by a separator (`SEP`).
@@ -92,10 +92,9 @@ where
     }
 }
 
-#[cfg(feature = "aggs")]
-impl<T, const SEP: char> crate::core::Aggregatable for SepVec<T, SEP>
+impl<T, const SEP: char> Aggregatable for SepVec<T, SEP>
 where
-    T: crate::core::Aggregatable,
+    T: Aggregatable,
 {
     type Item = T::Item;
 
@@ -107,7 +106,6 @@ where
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::Aggregatable;
     use crate::Pair;
     use crate::{Error, Reason};