sp-std removal from substrate/primitives (#3274)

This PR removes sp-std crate from substrate/primitives sub-directories.

For now crates that have `pub use` of sp-std or export macros that would
necessitate users of the macros to `extern crate alloc` have been
excluded from this PR.

There should be no breaking changes in this PR.

---------

Co-authored-by: Koute <koute@users.noreply.github.com>

substrate/primitives/arithmetic/src/biguint.rs

@@ -17,9 +17,10 @@
 
 //! Infinite precision unsigned integer for substrate runtime.
 
+use alloc::{vec, vec::Vec};
 use codec::{Decode, Encode};
+use core::{cell::RefCell, cmp::Ordering, ops};
 use num_traits::{One, Zero};
-use sp_std::{cell::RefCell, cmp::Ordering, ops, prelude::*, vec};
 
 // A sensible value for this would be half of the dword size of the host machine. Since the
 // runtime is compiled to 32bit webassembly, using 32 and 64 for single and double respectively
@@ -35,7 +36,7 @@ const SHIFT: usize = 32;
 const B: Double = Single::max_value() as Double + 1;
 
 static_assertions::const_assert!(
-	sp_std::mem::size_of::<Double>() - sp_std::mem::size_of::<Single>() == SHIFT / 8
+	core::mem::size_of::<Double>() - core::mem::size_of::<Single>() == SHIFT / 8
 );
 
 /// Splits a [`Double`] limb number into a tuple of two [`Single`] limb numbers.
@@ -438,9 +439,9 @@ impl BigUint {
 	}
 }
 
-impl sp_std::fmt::Debug for BigUint {
+impl core::fmt::Debug for BigUint {
 	#[cfg(feature = "std")]
-	fn fmt(&self, f: &mut sp_std::fmt::Formatter<'_>) -> sp_std::fmt::Result {
+	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
 		write!(
 			f,
 			"BigUint {{ {:?} ({:?})}}",
@@ -450,7 +451,7 @@ impl sp_std::fmt::Debug for BigUint {
 	}
 
 	#[cfg(not(feature = "std"))]
-	fn fmt(&self, _: &mut sp_std::fmt::Formatter<'_>) -> sp_std::fmt::Result {
+	fn fmt(&self, _: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
 		Ok(())
 	}
 }

substrate/primitives/arithmetic/src/fixed_point.rs

@@ -26,17 +26,16 @@ use crate::{
 	PerThing, Perbill, Rounding, SignedRounding,
 };
 use codec::{CompactAs, Decode, Encode};
-use sp_std::{
+use core::{
 	fmt::Debug,
 	ops::{self, Add, Div, Mul, Sub},
-	prelude::*,
 };
 
 #[cfg(feature = "serde")]
 use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 
 #[cfg(all(not(feature = "std"), feature = "serde"))]
-use sp_std::alloc::string::{String, ToString};
+use alloc::string::{String, ToString};
 
 /// Integer types that can be used to interact with `FixedPointNumber` implementations.
 pub trait FixedPointOperand:
@@ -899,9 +898,9 @@ macro_rules! implement_fixed {
 			}
 		}
 
-		impl sp_std::fmt::Debug for $name {
+		impl ::core::fmt::Debug for $name {
 			#[cfg(feature = "std")]
-			fn fmt(&self, f: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {
+			fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
 				let integral = {
 					let int = self.0 / Self::accuracy();
 					let signum_for_zero = if int == 0 && self.is_negative() { "-" } else { "" };
@@ -917,7 +916,7 @@ macro_rules! implement_fixed {
 			}
 
 			#[cfg(not(feature = "std"))]
-			fn fmt(&self, _: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {
+			fn fmt(&self, _: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
 				Ok(())
 			}
 		}
@@ -933,13 +932,13 @@ macro_rules! implement_fixed {
 			}
 		}
 
-		impl sp_std::fmt::Display for $name {
-			fn fmt(&self, f: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {
+		impl ::core::fmt::Display for $name {
+			fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
 				write!(f, "{}", self.0)
 			}
 		}
 
-		impl sp_std::str::FromStr for $name {
+		impl ::core::str::FromStr for $name {
 			type Err = &'static str;
 
 			fn from_str(s: &str) -> Result<Self, Self::Err> {
@@ -969,7 +968,7 @@ macro_rules! implement_fixed {
 			where
 				D: Deserializer<'de>,
 			{
-				use sp_std::str::FromStr;
+				use ::core::str::FromStr;
 				let s = String::deserialize(deserializer)?;
 				$name::from_str(&s).map_err(de::Error::custom)
 			}

substrate/primitives/arithmetic/src/lib.rs

@@ -19,6 +19,8 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
+extern crate alloc;
+
 /// Copied from `sp-runtime` and documented there.
 #[macro_export]
 macro_rules! assert_eq_error_rate {
@@ -49,7 +51,8 @@ pub use per_things::{
 };
 pub use rational::{MultiplyRational, Rational128, RationalInfinite};
 
-use sp_std::{cmp::Ordering, fmt::Debug, prelude::*};
+use alloc::vec::Vec;
+use core::{cmp::Ordering, fmt::Debug};
 use traits::{BaseArithmetic, One, SaturatedConversion, Unsigned, Zero};
 
 use codec::{Decode, Encode, MaxEncodedLen};
@@ -429,7 +432,7 @@ mod normalize_tests {
 mod threshold_compare_tests {
 	use super::*;
 	use crate::traits::Saturating;
-	use sp_std::cmp::Ordering;
+	use core::cmp::Ordering;
 
 	#[test]
 	fn epsilon_ord_works() {

substrate/primitives/arithmetic/src/per_things.rs

@@ -23,12 +23,11 @@ use crate::traits::{
 	Saturating, UniqueSaturatedInto, Unsigned, Zero,
 };
 use codec::{CompactAs, Encode};
-use num_traits::{Pow, SaturatingAdd, SaturatingSub};
-use sp_std::{
+use core::{
 	fmt, ops,
 	ops::{Add, Sub},
-	prelude::*,
 };
+use num_traits::{Pow, SaturatingAdd, SaturatingSub};
 
 /// Get the inner type of a `PerThing`.
 pub type InnerOf<P> = <P as PerThing>::Inner;
@@ -414,7 +413,7 @@ pub trait PerThing:
 }
 
 /// The rounding method to use for unsigned quantities.
-#[derive(Copy, Clone, sp_std::fmt::Debug)]
+#[derive(Copy, Clone, core::fmt::Debug)]
 pub enum Rounding {
 	// Towards infinity.
 	Up,
@@ -427,7 +426,7 @@ pub enum Rounding {
 }
 
 /// The rounding method to use.
-#[derive(Copy, Clone, sp_std::fmt::Debug)]
+#[derive(Copy, Clone, core::fmt::Debug)]
 pub enum SignedRounding {
 	// Towards positive infinity.
 	High,
@@ -580,8 +579,8 @@ macro_rules! implement_per_thing {
 		}
 
 		#[cfg(feature = "std")]
-		impl sp_std::fmt::Debug for $name {
-			fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
+		impl core::fmt::Debug for $name {
+			fn fmt(&self, fmt: &mut core::fmt::Formatter) -> core::fmt::Result {
 				if $max == <$type>::max_value() {
 					// Not a power of ten: show as N/D and approx %
 					let pc = (self.0 as f64) / (self.0 as f64) * 100f64;
@@ -606,8 +605,8 @@ macro_rules! implement_per_thing {
 		}
 
 		#[cfg(not(feature = "std"))]
-		impl sp_std::fmt::Debug for $name {
-			fn fmt(&self, fmt: &mut sp_std::fmt::Formatter) -> sp_std::fmt::Result {
+		impl core::fmt::Debug for $name {
+			fn fmt(&self, fmt: &mut core::fmt::Formatter) -> core::fmt::Result {
 				if $max == <$type>::max_value() {
 					// Not a power of ten: show as N/D and approx %
 					write!(fmt, "{}/{}", self.0, $max)

substrate/primitives/arithmetic/src/rational.rs

@@ -16,8 +16,8 @@
 // limitations under the License.
 
 use crate::{biguint::BigUint, helpers_128bit, Rounding};
+use core::cmp::Ordering;
 use num_traits::{Bounded, One, Zero};
-use sp_std::{cmp::Ordering, prelude::*};
 
 /// A wrapper for any rational number with infinitely large numerator and denominator.
 ///
@@ -92,15 +92,15 @@ impl From<Rational128> for RationalInfinite {
 pub struct Rational128(u128, u128);
 
 #[cfg(feature = "std")]
-impl sp_std::fmt::Debug for Rational128 {
-	fn fmt(&self, f: &mut sp_std::fmt::Formatter<'_>) -> sp_std::fmt::Result {
+impl core::fmt::Debug for Rational128 {
+	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
 		write!(f, "Rational128({} / {} ≈ {:.8})", self.0, self.1, self.0 as f64 / self.1 as f64)
 	}
 }
 
 #[cfg(not(feature = "std"))]
-impl sp_std::fmt::Debug for Rational128 {
-	fn fmt(&self, f: &mut sp_std::fmt::Formatter<'_>) -> sp_std::fmt::Result {
+impl core::fmt::Debug for Rational128 {
+	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
 		write!(f, "Rational128({} / {})", self.0, self.1)
 	}
 }