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feat: extract serde_core out of serde

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This commit is contained in:
Piotr Osiewicz 2025-05-25 20:19:56 +02:00
parent babafa54d2
commit f3869307cc
27 changed files with 898 additions and 219 deletions
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1
Cargo.toml
View File

@ -1,6 +1,7 @@
[workspace]
members = [
"serde",
"serde_core",
"serde_derive",
"serde_derive_internals",
"test_suite",

9
serde/Cargo.toml
View File

@ -15,6 +15,7 @@ repository = "https://github.com/serde-rs/serde"
rust-version = "1.56"
[dependencies]
serde_core = { version = "=1.0.219", path = "../serde_core", default-features = false }
serde_derive = { version = "1", optional = true, path = "../serde_derive" }
[dev-dependencies]
@ -52,20 +53,20 @@ derive = ["serde_derive"]
# Provide impls for common standard library types like Vec<T> and HashMap<K, V>.
# Requires a dependency on the Rust standard library.
std = []
std = ["serde_core/std"]
# Provide impls for types that require unstable functionality. For tracking and
# discussion of unstable functionality please refer to this issue:
#
# https://github.com/serde-rs/serde/issues/812
unstable = []
unstable = ["serde_core/unstable"]
# Provide impls for types in the Rust core allocation and collections library
# including String, Box<T>, Vec<T>, and Cow<T>. This is a subset of std but may
# be enabled without depending on all of std.
alloc = []
alloc = ["serde_core/alloc"]
# Opt into impls for Rc<T> and Arc<T>. Serializing and deserializing these types
# does not preserve identity and may result in multiple copies of the same data.
# Be sure that this is what you want before enabling this feature.
rc = []
rc = ["serde_core/rc"]

62
serde/build.rs
View File

@ -14,75 +14,13 @@ fn main() {
};
if minor >= 77 {
println!("cargo:rustc-check-cfg=cfg(no_core_cstr)");
println!("cargo:rustc-check-cfg=cfg(no_core_error)");
println!("cargo:rustc-check-cfg=cfg(no_core_net)");
println!("cargo:rustc-check-cfg=cfg(no_core_num_saturating)");
println!("cargo:rustc-check-cfg=cfg(no_diagnostic_namespace)");
println!("cargo:rustc-check-cfg=cfg(no_serde_derive)");
println!("cargo:rustc-check-cfg=cfg(no_std_atomic)");
println!("cargo:rustc-check-cfg=cfg(no_std_atomic64)");
println!("cargo:rustc-check-cfg=cfg(no_target_has_atomic)");
}
let target = env::var("TARGET").unwrap();
let emscripten = target == "asmjs-unknown-emscripten" || target == "wasm32-unknown-emscripten";
// Support for #[cfg(target_has_atomic = "...")] stabilized in Rust 1.60.
if minor < 60 {
println!("cargo:rustc-cfg=no_target_has_atomic");
// Allowlist of archs that support std::sync::atomic module. This is
// based on rustc's compiler/rustc_target/src/spec/*.rs.
let has_atomic64 = target.starts_with("x86_64")
|| target.starts_with("i686")
|| target.starts_with("aarch64")
|| target.starts_with("powerpc64")
|| target.starts_with("sparc64")
|| target.starts_with("mips64el")
|| target.starts_with("riscv64");
let has_atomic32 = has_atomic64 || emscripten;
if minor < 34 || !has_atomic64 {
println!("cargo:rustc-cfg=no_std_atomic64");
}
if minor < 34 || !has_atomic32 {
println!("cargo:rustc-cfg=no_std_atomic");
}
}
// Current minimum supported version of serde_derive crate is Rust 1.61.
if minor < 61 {
println!("cargo:rustc-cfg=no_serde_derive");
}
// Support for core::ffi::CStr and alloc::ffi::CString stabilized in Rust 1.64.
// https://blog.rust-lang.org/2022/09/22/Rust-1.64.0.html#c-compatible-ffi-types-in-core-and-alloc
if minor < 64 {
println!("cargo:rustc-cfg=no_core_cstr");
}
// Support for core::num::Saturating and std::num::Saturating stabilized in Rust 1.74
// https://blog.rust-lang.org/2023/11/16/Rust-1.74.0.html#stabilized-apis
if minor < 74 {
println!("cargo:rustc-cfg=no_core_num_saturating");
}
// Support for core::net stabilized in Rust 1.77.
// https://blog.rust-lang.org/2024/03/21/Rust-1.77.0.html
if minor < 77 {
println!("cargo:rustc-cfg=no_core_net");
}
// Support for the `#[diagnostic]` tool attribute namespace
// https://blog.rust-lang.org/2024/05/02/Rust-1.78.0.html#diagnostic-attributes
if minor < 78 {
println!("cargo:rustc-cfg=no_diagnostic_namespace");
}
// The Error trait became available in core in 1.81.
// https://blog.rust-lang.org/2024/09/05/Rust-1.81.0.html#coreerrorerror
if minor < 81 {
println!("cargo:rustc-cfg=no_core_error");
}
}
fn rustc_minor_version() -> Option<u32> {

97
serde/src/lib.rs
View File

@ -175,23 +175,18 @@ mod lib {
}
pub use self::core::{f32, f64};
pub use self::core::{iter, num, ptr, str};
pub use self::core::{ptr, str};
#[cfg(any(feature = "std", feature = "alloc"))]
pub use self::core::{cmp, mem, slice};
pub use self::core::slice;
pub use self::core::cell::{Cell, RefCell};
pub use self::core::clone;
pub use self::core::cmp::Reverse;
pub use self::core::convert;
pub use self::core::default;
pub use self::core::fmt::{self, Debug, Display, Write as FmtWrite};
pub use self::core::marker::{self, PhantomData};
pub use self::core::num::Wrapping;
pub use self::core::ops::{Bound, Range, RangeFrom, RangeInclusive, RangeTo};
pub use self::core::option;
pub use self::core::result;
pub use self::core::time::Duration;
#[cfg(all(feature = "alloc", not(feature = "std")))]
pub use alloc::borrow::{Cow, ToOwned};
@ -213,83 +208,15 @@ mod lib {
#[cfg(feature = "std")]
pub use std::boxed::Box;
#[cfg(all(feature = "rc", feature = "alloc", not(feature = "std")))]
pub use alloc::rc::{Rc, Weak as RcWeak};
#[cfg(all(feature = "rc", feature = "std"))]
pub use std::rc::{Rc, Weak as RcWeak};
#[cfg(all(feature = "rc", feature = "alloc", not(feature = "std")))]
pub use alloc::sync::{Arc, Weak as ArcWeak};
#[cfg(all(feature = "rc", feature = "std"))]
pub use std::sync::{Arc, Weak as ArcWeak};
#[cfg(all(feature = "alloc", not(feature = "std")))]
pub use alloc::collections::{BTreeMap, BTreeSet, BinaryHeap, LinkedList, VecDeque};
#[cfg(feature = "std")]
pub use std::collections::{BTreeMap, BTreeSet, BinaryHeap, LinkedList, VecDeque};
#[cfg(all(not(no_core_cstr), not(feature = "std")))]
pub use self::core::ffi::CStr;
#[cfg(feature = "std")]
pub use std::ffi::CStr;
#[cfg(all(not(no_core_cstr), feature = "alloc", not(feature = "std")))]
pub use alloc::ffi::CString;
#[cfg(feature = "std")]
pub use std::ffi::CString;
#[cfg(all(not(no_core_net), not(feature = "std")))]
pub use self::core::net;
#[cfg(feature = "std")]
pub use std::net;
#[cfg(feature = "std")]
pub use std::error;
#[cfg(feature = "std")]
pub use std::collections::{HashMap, HashSet};
#[cfg(feature = "std")]
pub use std::ffi::{OsStr, OsString};
#[cfg(feature = "std")]
pub use std::hash::{BuildHasher, Hash};
#[cfg(feature = "std")]
pub use std::io::Write;
#[cfg(feature = "std")]
pub use std::path::{Path, PathBuf};
#[cfg(feature = "std")]
pub use std::sync::{Mutex, RwLock};
#[cfg(feature = "std")]
pub use std::time::{SystemTime, UNIX_EPOCH};
#[cfg(all(feature = "std", no_target_has_atomic, not(no_std_atomic)))]
pub use std::sync::atomic::{
AtomicBool, AtomicI16, AtomicI32, AtomicI8, AtomicIsize, AtomicU16, AtomicU32, AtomicU8,
AtomicUsize, Ordering,
};
#[cfg(all(feature = "std", no_target_has_atomic, not(no_std_atomic64)))]
pub use std::sync::atomic::{AtomicI64, AtomicU64};
#[cfg(all(feature = "std", not(no_target_has_atomic)))]
pub use std::sync::atomic::Ordering;
#[cfg(all(feature = "std", not(no_target_has_atomic), target_has_atomic = "8"))]
pub use std::sync::atomic::{AtomicBool, AtomicI8, AtomicU8};
#[cfg(all(feature = "std", not(no_target_has_atomic), target_has_atomic = "16"))]
pub use std::sync::atomic::{AtomicI16, AtomicU16};
#[cfg(all(feature = "std", not(no_target_has_atomic), target_has_atomic = "32"))]
pub use std::sync::atomic::{AtomicI32, AtomicU32};
#[cfg(all(feature = "std", not(no_target_has_atomic), target_has_atomic = "64"))]
pub use std::sync::atomic::{AtomicI64, AtomicU64};
#[cfg(all(feature = "std", not(no_target_has_atomic), target_has_atomic = "ptr"))]
pub use std::sync::atomic::{AtomicIsize, AtomicUsize};
#[cfg(not(no_core_num_saturating))]
pub use self::core::num::Saturating;
}
// None of this crate's error handling needs the `From::from` error conversion
// performed implicitly by the `?` operator or the standard library's `try!`
// macro. This simplified macro gives a 5.5% improvement in compile time
// compared to standard `try!`, and 9% improvement compared to `?`.
#[allow(unused_macros)]
macro_rules! tri {
($expr:expr) => {
match $expr {
@ -301,33 +228,17 @@ macro_rules! tri {
////////////////////////////////////////////////////////////////////////////////
#[macro_use]
mod macros;
#[macro_use]
mod integer128;
pub mod de;
pub mod ser;
mod format;
#[doc(inline)]
pub use crate::de::{Deserialize, Deserializer};
#[doc(inline)]
pub use crate::ser::{Serialize, Serializer};
pub use serde_core::*;
// Used by generated code and doc tests. Not public API.
#[doc(hidden)]
#[path = "private/mod.rs"]
pub mod __private;
#[path = "de/seed.rs"]
mod seed;
#[cfg(all(not(feature = "std"), no_core_error))]
mod std_error;
// Re-export #[derive(Serialize, Deserialize)].
//
// The reason re-exporting is not enabled by default is that disabling it would

26
serde/src/private/de.rs
View File

@ -16,7 +16,7 @@ pub use self::content::{
TagOrContentField, TagOrContentFieldVisitor, TaggedContentVisitor, UntaggedUnitVisitor,
};
pub use crate::seed::InPlaceSeed;
pub use serde_core::de::InPlaceSeed;
/// If the missing field is of type `Option<T>` then treat is as `None`,
/// otherwise it is an error.
@ -47,7 +47,7 @@ where
visitor.visit_none()
}
forward_to_deserialize_any! {
serde_core::forward_to_deserialize_any! {
bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
bytes byte_buf unit unit_struct newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any
@ -297,7 +297,7 @@ mod content {
// Untagged and internally tagged enums are only supported in
// self-describing formats.
let visitor = ContentVisitor { value: PhantomData };
deserializer.__deserialize_content(visitor)
deserializer.deserialize_any(visitor)
}
}
@ -1496,14 +1496,6 @@ mod content {
drop(self);
visitor.visit_unit()
}
fn __deserialize_content<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de, Value = Content<'de>>,
{
let _ = visitor;
Ok(self.content)
}
}
impl<'de, E> ContentDeserializer<'de, E> {
@ -2085,14 +2077,6 @@ mod content {
{
visitor.visit_unit()
}
fn __deserialize_content<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de, Value = Content<'de>>,
{
let _ = visitor;
Ok(self.content.clone())
}
}
impl<'a, 'de, E> ContentRefDeserializer<'a, 'de, E> {
@ -2397,7 +2381,7 @@ where
visitor.visit_str(self.value)
}
forward_to_deserialize_any! {
serde_core::forward_to_deserialize_any! {
bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
bytes byte_buf option unit unit_struct newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any
@ -2422,7 +2406,7 @@ where
visitor.visit_borrowed_str(self.value)
}
forward_to_deserialize_any! {
serde_core::forward_to_deserialize_any! {
bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
bytes byte_buf option unit unit_struct newtype_struct seq tuple
tuple_struct map struct enum identifier ignored_any

22
serde/src/private/mod.rs
View File

@ -21,25 +21,5 @@ pub use self::string::from_utf8_lossy;
pub use crate::lib::{ToString, Vec};
mod string {
use crate::lib::*;
#[cfg(any(feature = "std", feature = "alloc"))]
pub fn from_utf8_lossy(bytes: &[u8]) -> Cow<str> {
String::from_utf8_lossy(bytes)
}
// The generated code calls this like:
//
// let value = &_serde::__private::from_utf8_lossy(bytes);
// Err(_serde::de::Error::unknown_variant(value, VARIANTS))
//
// so it is okay for the return type to be different from the std case as long
// as the above works.
#[cfg(not(any(feature = "std", feature = "alloc")))]
pub fn from_utf8_lossy(bytes: &[u8]) -> &str {
// Three unicode replacement characters if it fails. They look like a
// white-on-black question mark. The user will recognize it as invalid
// UTF-8.
str::from_utf8(bytes).unwrap_or("\u{fffd}\u{fffd}\u{fffd}")
}
pub use serde_core::from_utf8_lossy;
}

57
serde_core/Cargo.toml Normal file
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@ -0,0 +1,57 @@
[package]
name = "serde_core"
version = "1.0.219"
authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
build = "build.rs"
categories = ["encoding", "no-std", "no-std::no-alloc"]
description = "Core functionalities and abstractions for the Serde serialization/deserialization framework"
documentation = "https://docs.rs/serde_core"
edition = "2021"
homepage = "https://serde.rs"
keywords = ["serde", "serialization", "no_std"]
license = "MIT OR Apache-2.0"
readme = "crates-io.md"
repository = "https://github.com/serde-rs/serde"
rust-version = "1.56"
[dev-dependencies]
serde = { version = "1", path = "../serde" }
[package.metadata.playground]
features = ["rc"]
[package.metadata.docs.rs]
features = ["rc", "unstable"]
targets = ["x86_64-unknown-linux-gnu"]
rustdoc-args = [
"--generate-link-to-definition",
"--extern-html-root-url=core=https://doc.rust-lang.org",
"--extern-html-root-url=alloc=https://doc.rust-lang.org",
"--extern-html-root-url=std=https://doc.rust-lang.org",
]
### FEATURES #################################################################
[features]
default = ["std"]
# Provide impls for common standard library types like Vec<T> and HashMap<K, V>.
# Requires a dependency on the Rust standard library.
std = []
# Provide impls for types that require unstable functionality. For tracking and
# discussion of unstable functionality please refer to this issue:
#
# https://github.com/serde-rs/serde/issues/812
unstable = []
# Provide impls for types in the Rust core allocation and collections library
# including String, Box<T>, Vec<T>, and Cow<T>. This is a subset of std but may
# be enabled without depending on all of std.
alloc = []
# Opt into impls for Rc<T> and Arc<T>. Serializing and deserializing these types
# does not preserve identity and may result in multiple copies of the same data.
# Be sure that this is what you want before enabling this feature.
rc = []

176
serde_core/LICENSE-APACHE Normal file
View File

@ -0,0 +1,176 @@
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23
serde_core/LICENSE-MIT Normal file
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@ -0,0 +1,23 @@
Permission is hereby granted, free of charge, to any
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114
serde_core/README.md Normal file
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@ -0,0 +1,114 @@
# Serde &emsp; [![Build Status]][actions] [![Latest Version]][crates.io] [![serde msrv]][Rust 1.56] [![serde_derive msrv]][Rust 1.61]
[Build Status]: https://img.shields.io/github/actions/workflow/status/serde-rs/serde/ci.yml?branch=master
[actions]: https://github.com/serde-rs/serde/actions?query=branch%3Amaster
[Latest Version]: https://img.shields.io/crates/v/serde.svg
[crates.io]: https://crates.io/crates/serde
[serde msrv]: https://img.shields.io/crates/msrv/serde.svg?label=serde%20msrv&color=lightgray
[serde_derive msrv]: https://img.shields.io/crates/msrv/serde_derive.svg?label=serde_derive%20msrv&color=lightgray
[Rust 1.56]: https://blog.rust-lang.org/2021/10/21/Rust-1.56.0.html
[Rust 1.61]: https://blog.rust-lang.org/2022/05/19/Rust-1.61.0.html
**Serde is a framework for *ser*ializing and *de*serializing Rust data structures efficiently and generically.**
---
You may be looking for:
- [An overview of Serde](https://serde.rs/)
- [Data formats supported by Serde](https://serde.rs/#data-formats)
- [Setting up `#[derive(Serialize, Deserialize)]`](https://serde.rs/derive.html)
- [Examples](https://serde.rs/examples.html)
- [API documentation](https://docs.rs/serde)
- [Release notes](https://github.com/serde-rs/serde/releases)
## Serde in action
<details>
<summary>
Click to show Cargo.toml.
<a href="https://play.rust-lang.org/?edition=2021&gist=72755f28f99afc95e01d63174b28c1f5" target="_blank">Run this code in the playground.</a>
</summary>
```toml
[dependencies]
# The core APIs, including the Serialize and Deserialize traits. Always
# required when using Serde. The "derive" feature is only required when
# using #[derive(Serialize, Deserialize)] to make Serde work with structs
# and enums defined in your crate.
serde = { version = "1.0", features = ["derive"] }
# Each data format lives in its own crate; the sample code below uses JSON
# but you may be using a different one.
serde_json = "1.0"
```
</details>
<p></p>
```rust
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Debug)]
struct Point {
x: i32,
y: i32,
}
fn main() {
let point = Point { x: 1, y: 2 };
// Convert the Point to a JSON string.
let serialized = serde_json::to_string(&point).unwrap();
// Prints serialized = {"x":1,"y":2}
println!("serialized = {}", serialized);
// Convert the JSON string back to a Point.
let deserialized: Point = serde_json::from_str(&serialized).unwrap();
// Prints deserialized = Point { x: 1, y: 2 }
println!("deserialized = {:?}", deserialized);
}
```
## Getting help
Serde is one of the most widely used Rust libraries so any place that Rustaceans
congregate will be able to help you out. For chat, consider trying the
[#rust-questions] or [#rust-beginners] channels of the unofficial community
Discord (invite: <https://discord.gg/rust-lang-community>), the [#rust-usage] or
[#beginners] channels of the official Rust Project Discord (invite:
<https://discord.gg/rust-lang>), or the [#general][zulip] stream in Zulip. For
asynchronous, consider the [\[rust\] tag on StackOverflow][stackoverflow], the
[/r/rust] subreddit which has a pinned weekly easy questions post, or the Rust
[Discourse forum][discourse]. It's acceptable to file a support issue in this
repo but they tend not to get as many eyes as any of the above and may get
closed without a response after some time.
[#rust-questions]: https://discord.com/channels/273534239310479360/274215136414400513
[#rust-beginners]: https://discord.com/channels/273534239310479360/273541522815713281
[#rust-usage]: https://discord.com/channels/442252698964721669/443150878111694848
[#beginners]: https://discord.com/channels/442252698964721669/448238009733742612
[zulip]: https://rust-lang.zulipchat.com/#narrow/stream/122651-general
[stackoverflow]: https://stackoverflow.com/questions/tagged/rust
[/r/rust]: https://www.reddit.com/r/rust
[discourse]: https://users.rust-lang.org
<br>
#### License
<sup>
Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
</sup>
<br>
<sub>
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in Serde by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.
</sub>

91
serde_core/build.rs Normal file
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@ -0,0 +1,91 @@
use std::env;
use std::process::Command;
use std::str;
// The rustc-cfg strings below are *not* public API. Please let us know by
// opening a GitHub issue if your build environment requires some way to enable
// these cfgs other than by executing our build script.
fn main() {
println!("cargo:rerun-if-changed=build.rs");
let minor = match rustc_minor_version() {
Some(minor) => minor,
None => return,
};
if minor >= 77 {
println!("cargo:rustc-check-cfg=cfg(no_core_cstr)");
println!("cargo:rustc-check-cfg=cfg(no_core_error)");
println!("cargo:rustc-check-cfg=cfg(no_core_net)");
println!("cargo:rustc-check-cfg=cfg(no_core_num_saturating)");
println!("cargo:rustc-check-cfg=cfg(no_diagnostic_namespace)");
println!("cargo:rustc-check-cfg=cfg(no_std_atomic)");
println!("cargo:rustc-check-cfg=cfg(no_std_atomic64)");
println!("cargo:rustc-check-cfg=cfg(no_target_has_atomic)");
}
let target = env::var("TARGET").unwrap();
let emscripten = target == "asmjs-unknown-emscripten" || target == "wasm32-unknown-emscripten";
// Support for #[cfg(target_has_atomic = "...")] stabilized in Rust 1.60.
if minor < 60 {
println!("cargo:rustc-cfg=no_target_has_atomic");
// Allowlist of archs that support std::sync::atomic module. This is
// based on rustc's compiler/rustc_target/src/spec/*.rs.
let has_atomic64 = target.starts_with("x86_64")
|| target.starts_with("i686")
|| target.starts_with("aarch64")
|| target.starts_with("powerpc64")
|| target.starts_with("sparc64")
|| target.starts_with("mips64el")
|| target.starts_with("riscv64");
let has_atomic32 = has_atomic64 || emscripten;
if minor < 34 || !has_atomic64 {
println!("cargo:rustc-cfg=no_std_atomic64");
}
if minor < 34 || !has_atomic32 {
println!("cargo:rustc-cfg=no_std_atomic");
}
}
// Support for core::ffi::CStr and alloc::ffi::CString stabilized in Rust 1.64.
// https://blog.rust-lang.org/2022/09/22/Rust-1.64.0.html#c-compatible-ffi-types-in-core-and-alloc
if minor < 64 {
println!("cargo:rustc-cfg=no_core_cstr");
}
// Support for core::num::Saturating and std::num::Saturating stabilized in Rust 1.74
// https://blog.rust-lang.org/2023/11/16/Rust-1.74.0.html#stabilized-apis
if minor < 74 {
println!("cargo:rustc-cfg=no_core_num_saturating");
}
// Support for core::net stabilized in Rust 1.77.
// https://blog.rust-lang.org/2024/03/21/Rust-1.77.0.html
if minor < 77 {
println!("cargo:rustc-cfg=no_core_net");
}
// Support for the `#[diagnostic]` tool attribute namespace
// https://blog.rust-lang.org/2024/05/02/Rust-1.78.0.html#diagnostic-attributes
if minor < 78 {
println!("cargo:rustc-cfg=no_diagnostic_namespace");
}
// The Error trait became available in core in 1.81.
// https://blog.rust-lang.org/2024/09/05/Rust-1.81.0.html#coreerrorerror
if minor < 81 {
println!("cargo:rustc-cfg=no_core_error");
}
}
fn rustc_minor_version() -> Option<u32> {
let rustc = env::var_os("RUSTC")?;
let output = Command::new(rustc).arg("--version").output().ok()?;
let version = str::from_utf8(&output.stdout).ok()?;
let mut pieces = version.split('.');
if pieces.next() != Some("rustc 1") {
return None;
}
pieces.next()?.parse().ok()
}

65
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@ -0,0 +1,65 @@
<!-- Serde readme rendered on crates.io -->
**Serde is a framework for *ser*ializing and *de*serializing Rust data structures efficiently and generically.**
---
You may be looking for:
- [An overview of Serde](https://serde.rs/)
- [Data formats supported by Serde](https://serde.rs/#data-formats)
- [Setting up `#[derive(Serialize, Deserialize)]`](https://serde.rs/derive.html)
- [Examples](https://serde.rs/examples.html)
- [API documentation](https://docs.rs/serde)
- [Release notes](https://github.com/serde-rs/serde/releases)
## Serde in action
```rust
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Debug)]
struct Point {
x: i32,
y: i32,
}
fn main() {
let point = Point { x: 1, y: 2 };
// Convert the Point to a JSON string.
let serialized = serde_json::to_string(&point).unwrap();
// Prints serialized = {"x":1,"y":2}
println!("serialized = {}", serialized);
// Convert the JSON string back to a Point.
let deserialized: Point = serde_json::from_str(&serialized).unwrap();
// Prints deserialized = Point { x: 1, y: 2 }
println!("deserialized = {:?}", deserialized);
}
```
## Getting help
Serde is one of the most widely used Rust libraries so any place that Rustaceans
congregate will be able to help you out. For chat, consider trying the
[#rust-questions] or [#rust-beginners] channels of the unofficial community
Discord (invite: <https://discord.gg/rust-lang-community>), the [#rust-usage]
or [#beginners] channels of the official Rust Project Discord (invite:
<https://discord.gg/rust-lang>), or the [#general][zulip] stream in Zulip. For
asynchronous, consider the [\[rust\] tag on StackOverflow][stackoverflow], the
[/r/rust] subreddit which has a pinned weekly easy questions post, or the Rust
[Discourse forum][discourse]. It's acceptable to file a support issue in this
repo but they tend not to get as many eyes as any of the above and may get
closed without a response after some time.
[#rust-questions]: https://discord.com/channels/273534239310479360/274215136414400513
[#rust-beginners]: https://discord.com/channels/273534239310479360/273541522815713281
[#rust-usage]: https://discord.com/channels/442252698964721669/443150878111694848
[#beginners]: https://discord.com/channels/442252698964721669/448238009733742612
[zulip]: https://rust-lang.zulipchat.com/#narrow/stream/122651-general
[stackoverflow]: https://stackoverflow.com/questions/tagged/rust
[/r/rust]: https://www.reddit.com/r/rust
[discourse]: https://users.rust-lang.org

0
serde/src/de/ignored_any.rs → serde_core/src/de/ignored_any.rs
View File

8
serde/src/de/impls.rs → serde_core/src/de/impls.rs
View File

@ -2174,7 +2174,7 @@ impl<'de> Deserialize<'de> for Duration {
b"secs" => Ok(Field::Secs),
b"nanos" => Ok(Field::Nanos),
_ => {
let value = crate::__private::from_utf8_lossy(value);
let value = crate::lib::from_utf8_lossy(value);
Err(Error::unknown_field(&*value, FIELDS))
}
}
@ -2510,7 +2510,7 @@ mod range {
b"start" => Ok(Field::Start),
b"end" => Ok(Field::End),
_ => {
let value = crate::__private::from_utf8_lossy(value);
let value = crate::lib::from_utf8_lossy(value);
Err(Error::unknown_field(&*value, FIELDS))
}
}
@ -2665,7 +2665,7 @@ mod range_from {
match value {
b"start" => Ok(Field::Start),
_ => {
let value = crate::__private::from_utf8_lossy(value);
let value = crate::lib::from_utf8_lossy(value);
Err(Error::unknown_field(&*value, FIELDS))
}
}
@ -2803,7 +2803,7 @@ mod range_to {
match value {
b"end" => Ok(Field::End),
_ => {
let value = crate::__private::from_utf8_lossy(value);
let value = crate::lib::from_utf8_lossy(value);
Err(Error::unknown_field(&*value, FIELDS))
}
}

14
serde/src/de/mod.rs → serde_core/src/de/mod.rs
View File

@ -120,10 +120,10 @@ pub mod value;
mod ignored_any;
mod impls;
pub(crate) mod size_hint;
pub mod size_hint;
pub use self::ignored_any::IgnoredAny;
pub use crate::seed::InPlaceSeed;
#[cfg(all(not(feature = "std"), no_core_error))]
#[doc(no_inline)]
pub use crate::std_error::Error as StdError;
@ -1222,16 +1222,6 @@ pub trait Deserializer<'de>: Sized {
fn is_human_readable(&self) -> bool {
true
}
// Not public API.
#[cfg(all(not(no_serde_derive), any(feature = "std", feature = "alloc")))]
#[doc(hidden)]
fn __deserialize_content<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de, Value = crate::__private::de::Content<'de>>,
{
self.deserialize_any(visitor)
}
}
////////////////////////////////////////////////////////////////////////////////

0
serde/src/de/seed.rs → serde_core/src/de/seed.rs
View File

3
serde/src/de/size_hint.rs → serde_core/src/de/size_hint.rs
View File

@ -1,6 +1,8 @@
//! Provides helpers for creating size hints for container deserialization.
#[cfg(any(feature = "std", feature = "alloc"))]
use crate::lib::*;
/// Extracts the exact size of an iterator if it has a known upper bound and it matches the lower bound.
pub fn from_bounds<I>(iter: &I) -> Option<usize>
where
I: Iterator,
@ -8,6 +10,7 @@ where
helper(iter.size_hint())
}
/// Returns conservative size estimate for a container, clamping the result to a maximum size.
#[cfg(any(feature = "std", feature = "alloc"))]
pub fn cautious<Element>(hint: Option<usize>) -> usize {
const MAX_PREALLOC_BYTES: usize = 1024 * 1024;

0
serde/src/de/value.rs → serde_core/src/de/value.rs
View File

0
serde/src/format.rs → serde_core/src/format.rs
View File

0
serde/src/integer128.rs → serde_core/src/integer128.rs
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346
serde_core/src/lib.rs Normal file
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@ -0,0 +1,346 @@
//! # Serde
//!
//! Serde is a framework for ***ser***ializing and ***de***serializing Rust data
//! structures efficiently and generically.
//!
//! The Serde ecosystem consists of data structures that know how to serialize
//! and deserialize themselves along with data formats that know how to
//! serialize and deserialize other things. Serde provides the layer by which
//! these two groups interact with each other, allowing any supported data
//! structure to be serialized and deserialized using any supported data format.
//!
//! See the Serde website <https://serde.rs/> for additional documentation and
//! usage examples.
//!
//! ## Design
//!
//! Where many other languages rely on runtime reflection for serializing data,
//! Serde is instead built on Rust's powerful trait system. A data structure
//! that knows how to serialize and deserialize itself is one that implements
//! Serde's `Serialize` and `Deserialize` traits (or uses Serde's derive
//! attribute to automatically generate implementations at compile time). This
//! avoids any overhead of reflection or runtime type information. In fact in
//! many situations the interaction between data structure and data format can
//! be completely optimized away by the Rust compiler, leaving Serde
//! serialization to perform the same speed as a handwritten serializer for the
//! specific selection of data structure and data format.
//!
//! ## Data formats
//!
//! The following is a partial list of data formats that have been implemented
//! for Serde by the community.
//!
//! - [JSON], the ubiquitous JavaScript Object Notation used by many HTTP APIs.
//! - [Postcard], a no\_std and embedded-systems friendly compact binary format.
//! - [CBOR], a Concise Binary Object Representation designed for small message
//! size without the need for version negotiation.
//! - [YAML], a self-proclaimed human-friendly configuration language that ain't
//! markup language.
//! - [MessagePack], an efficient binary format that resembles a compact JSON.
//! - [TOML], a minimal configuration format used by [Cargo].
//! - [Pickle], a format common in the Python world.
//! - [RON], a Rusty Object Notation.
//! - [BSON], the data storage and network transfer format used by MongoDB.
//! - [Avro], a binary format used within Apache Hadoop, with support for schema
//! definition.
//! - [JSON5], a superset of JSON including some productions from ES5.
//! - [URL] query strings, in the x-www-form-urlencoded format.
//! - [Starlark], the format used for describing build targets by the Bazel and
//! Buck build systems. *(serialization only)*
//! - [Envy], a way to deserialize environment variables into Rust structs.
//! *(deserialization only)*
//! - [Envy Store], a way to deserialize [AWS Parameter Store] parameters into
//! Rust structs. *(deserialization only)*
//! - [S-expressions], the textual representation of code and data used by the
//! Lisp language family.
//! - [D-Bus]'s binary wire format.
//! - [FlexBuffers], the schemaless cousin of Google's FlatBuffers zero-copy
//! serialization format.
//! - [Bencode], a simple binary format used in the BitTorrent protocol.
//! - [Token streams], for processing Rust procedural macro input.
//! *(deserialization only)*
//! - [DynamoDB Items], the format used by [rusoto_dynamodb] to transfer data to
//! and from DynamoDB.
//! - [Hjson], a syntax extension to JSON designed around human reading and
//! editing. *(deserialization only)*
//! - [CSV], Comma-separated values is a tabular text file format.
//!
//! [JSON]: https://github.com/serde-rs/json
//! [Postcard]: https://github.com/jamesmunns/postcard
//! [CBOR]: https://github.com/enarx/ciborium
//! [YAML]: https://github.com/dtolnay/serde-yaml
//! [MessagePack]: https://github.com/3Hren/msgpack-rust
//! [TOML]: https://docs.rs/toml
//! [Pickle]: https://github.com/birkenfeld/serde-pickle
//! [RON]: https://github.com/ron-rs/ron
//! [BSON]: https://github.com/mongodb/bson-rust
//! [Avro]: https://docs.rs/apache-avro
//! [JSON5]: https://github.com/callum-oakley/json5-rs
//! [URL]: https://docs.rs/serde_qs
//! [Starlark]: https://github.com/dtolnay/serde-starlark
//! [Envy]: https://github.com/softprops/envy
//! [Envy Store]: https://github.com/softprops/envy-store
//! [Cargo]: https://doc.rust-lang.org/cargo/reference/manifest.html
//! [AWS Parameter Store]: https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-parameter-store.html
//! [S-expressions]: https://github.com/rotty/lexpr-rs
//! [D-Bus]: https://docs.rs/zvariant
//! [FlexBuffers]: https://github.com/google/flatbuffers/tree/master/rust/flexbuffers
//! [Bencode]: https://github.com/P3KI/bendy
//! [Token streams]: https://github.com/oxidecomputer/serde_tokenstream
//! [DynamoDB Items]: https://docs.rs/serde_dynamo
//! [rusoto_dynamodb]: https://docs.rs/rusoto_dynamodb
//! [Hjson]: https://github.com/Canop/deser-hjson
//! [CSV]: https://docs.rs/csv
////////////////////////////////////////////////////////////////////////////////
// Serde types in rustdoc of other crates get linked to here.
#![doc(html_root_url = "https://docs.rs/serde_core/1.0.219")]
// Support using Serde without the standard library!
#![cfg_attr(not(feature = "std"), no_std)]
// Show which crate feature enables conditionally compiled APIs in documentation.
#![cfg_attr(docsrs, feature(doc_cfg, rustdoc_internals))]
#![cfg_attr(docsrs, allow(internal_features))]
// Unstable functionality only if the user asks for it. For tracking and
// discussion of these features please refer to this issue:
//
// https://github.com/serde-rs/serde/issues/812
#![cfg_attr(feature = "unstable", feature(never_type))]
#![allow(unknown_lints, bare_trait_objects, deprecated)]
// Ignored clippy and clippy_pedantic lints
#![allow(
// clippy bug: https://github.com/rust-lang/rust-clippy/issues/5704
clippy::unnested_or_patterns,
// clippy bug: https://github.com/rust-lang/rust-clippy/issues/7768
clippy::semicolon_if_nothing_returned,
// not available in our oldest supported compiler
clippy::empty_enum,
clippy::type_repetition_in_bounds, // https://github.com/rust-lang/rust-clippy/issues/8772
// integer and float ser/de requires these sorts of casts
clippy::cast_possible_truncation,
clippy::cast_possible_wrap,
clippy::cast_precision_loss,
clippy::cast_sign_loss,
// things are often more readable this way
clippy::cast_lossless,
clippy::module_name_repetitions,
clippy::single_match_else,
clippy::type_complexity,
clippy::use_self,
clippy::zero_prefixed_literal,
// correctly used
clippy::derive_partial_eq_without_eq,
clippy::enum_glob_use,
clippy::explicit_auto_deref,
clippy::incompatible_msrv,
clippy::let_underscore_untyped,
clippy::map_err_ignore,
clippy::new_without_default,
clippy::result_unit_err,
clippy::wildcard_imports,
// not practical
clippy::needless_pass_by_value,
clippy::similar_names,
clippy::too_many_lines,
// preference
clippy::doc_markdown,
clippy::elidable_lifetime_names,
clippy::needless_lifetimes,
clippy::unseparated_literal_suffix,
// false positive
clippy::needless_doctest_main,
// noisy
clippy::missing_errors_doc,
clippy::must_use_candidate,
)]
// Restrictions
#![deny(clippy::question_mark_used)]
// Rustc lints.
#![deny(missing_docs, unused_imports)]
////////////////////////////////////////////////////////////////////////////////
#[cfg(feature = "alloc")]
extern crate alloc;
/// A facade around all the types we need from the `std`, `core`, and `alloc`
/// crates. This avoids elaborate import wrangling having to happen in every
/// module.
mod lib {
mod core {
#[cfg(not(feature = "std"))]
pub use core::*;
#[cfg(feature = "std")]
pub use std::*;
}
pub use self::core::{f32, f64};
pub use self::core::{iter, num, str};
#[cfg(any(feature = "std", feature = "alloc"))]
pub use self::core::{cmp, mem};
pub use self::core::cell::{Cell, RefCell};
pub use self::core::cmp::Reverse;
pub use self::core::fmt::{self, Debug, Display, Write as FmtWrite};
pub use self::core::marker::PhantomData;
pub use self::core::num::Wrapping;
pub use self::core::ops::{Bound, Range, RangeFrom, RangeInclusive, RangeTo};
pub use self::core::result;
pub use self::core::time::Duration;
#[cfg(all(feature = "alloc", not(feature = "std")))]
pub use alloc::borrow::{Cow, ToOwned};
#[cfg(feature = "std")]
pub use std::borrow::{Cow, ToOwned};
#[cfg(all(feature = "alloc", not(feature = "std")))]
pub use alloc::string::{String, ToString};
#[cfg(feature = "std")]
pub use std::string::{String, ToString};
#[cfg(all(feature = "alloc", not(feature = "std")))]
pub use alloc::vec::Vec;
#[cfg(feature = "std")]
pub use std::vec::Vec;
#[cfg(all(feature = "alloc", not(feature = "std")))]
pub use alloc::boxed::Box;
#[cfg(feature = "std")]
pub use std::boxed::Box;
#[cfg(all(feature = "rc", feature = "alloc", not(feature = "std")))]
pub use alloc::rc::{Rc, Weak as RcWeak};
#[cfg(all(feature = "rc", feature = "std"))]
pub use std::rc::{Rc, Weak as RcWeak};
#[cfg(all(feature = "rc", feature = "alloc", not(feature = "std")))]
pub use alloc::sync::{Arc, Weak as ArcWeak};
#[cfg(all(feature = "rc", feature = "std"))]
pub use std::sync::{Arc, Weak as ArcWeak};
#[cfg(all(feature = "alloc", not(feature = "std")))]
pub use alloc::collections::{BTreeMap, BTreeSet, BinaryHeap, LinkedList, VecDeque};
#[cfg(feature = "std")]
pub use std::collections::{BTreeMap, BTreeSet, BinaryHeap, LinkedList, VecDeque};
#[cfg(all(not(no_core_cstr), not(feature = "std")))]
pub use self::core::ffi::CStr;
#[cfg(feature = "std")]
pub use std::ffi::CStr;
#[cfg(all(not(no_core_cstr), feature = "alloc", not(feature = "std")))]
pub use alloc::ffi::CString;
#[cfg(feature = "std")]
pub use std::ffi::CString;
#[cfg(all(not(no_core_net), not(feature = "std")))]
pub use self::core::net;
#[cfg(feature = "std")]
pub use std::net;
#[cfg(feature = "std")]
pub use std::error;
#[cfg(feature = "std")]
pub use std::collections::{HashMap, HashSet};
#[cfg(feature = "std")]
pub use std::ffi::{OsStr, OsString};
#[cfg(feature = "std")]
pub use std::hash::{BuildHasher, Hash};
#[cfg(feature = "std")]
pub use std::io::Write;
#[cfg(feature = "std")]
pub use std::path::{Path, PathBuf};
#[cfg(feature = "std")]
pub use std::sync::{Mutex, RwLock};
#[cfg(feature = "std")]
pub use std::time::{SystemTime, UNIX_EPOCH};
#[cfg(all(feature = "std", no_target_has_atomic, not(no_std_atomic)))]
pub use std::sync::atomic::{
AtomicBool, AtomicI16, AtomicI32, AtomicI8, AtomicIsize, AtomicU16, AtomicU32, AtomicU8,
AtomicUsize, Ordering,
};
#[cfg(all(feature = "std", no_target_has_atomic, not(no_std_atomic64)))]
pub use std::sync::atomic::{AtomicI64, AtomicU64};
#[cfg(all(feature = "std", not(no_target_has_atomic)))]
pub use std::sync::atomic::Ordering;
#[cfg(all(feature = "std", not(no_target_has_atomic), target_has_atomic = "8"))]
pub use std::sync::atomic::{AtomicBool, AtomicI8, AtomicU8};
#[cfg(all(feature = "std", not(no_target_has_atomic), target_has_atomic = "16"))]
pub use std::sync::atomic::{AtomicI16, AtomicU16};
#[cfg(all(feature = "std", not(no_target_has_atomic), target_has_atomic = "32"))]
pub use std::sync::atomic::{AtomicI32, AtomicU32};
#[cfg(all(feature = "std", not(no_target_has_atomic), target_has_atomic = "64"))]
pub use std::sync::atomic::{AtomicI64, AtomicU64};
#[cfg(all(feature = "std", not(no_target_has_atomic), target_has_atomic = "ptr"))]
pub use std::sync::atomic::{AtomicIsize, AtomicUsize};
#[cfg(not(no_core_num_saturating))]
pub use self::core::num::Saturating;
#[cfg(any(feature = "std", feature = "alloc"))]
#[doc(hidden)]
pub fn from_utf8_lossy(bytes: &[u8]) -> Cow<'_, str> {
String::from_utf8_lossy(bytes)
}
// The generated code calls this like:
//
// let value = &_serde::__private::from_utf8_lossy(bytes);
// Err(_serde::de::Error::unknown_variant(value, VARIANTS))
//
// so it is okay for the return type to be different from the std case as long
// as the above works.
#[cfg(not(any(feature = "std", feature = "alloc")))]
#[doc(hidden)]
pub fn from_utf8_lossy(bytes: &[u8]) -> &str {
// Three unicode replacement characters if it fails. They look like a
// white-on-black question mark. The user will recognize it as invalid
// UTF-8.
str::from_utf8(bytes).unwrap_or("\u{fffd}\u{fffd}\u{fffd}")
}
}
// None of this crate's error handling needs the `From::from` error conversion
// performed implicitly by the `?` operator or the standard library's `try!`
// macro. This simplified macro gives a 5.5% improvement in compile time
// compared to standard `try!`, and 9% improvement compared to `?`.
macro_rules! tri {
($expr:expr) => {
match $expr {
Ok(val) => val,
Err(err) => return Err(err),
}
};
}
////////////////////////////////////////////////////////////////////////////////
#[macro_use]
mod macros;
#[doc(hidden)]
pub use crate::lib::result::Result;
#[macro_use]
mod integer128;
pub mod de;
pub mod ser;
mod format;
#[doc(inline)]
pub use crate::de::{Deserialize, Deserializer};
#[doc(inline)]
pub use crate::ser::{Serialize, Serializer};
#[doc(hidden)]
pub use lib::from_utf8_lossy;
#[path = "de/seed.rs"]
mod seed;
#[cfg(all(not(feature = "std"), no_core_error))]
mod std_error;

3
serde/src/macros.rs → serde_core/src/macros.rs
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@ -1,7 +1,6 @@
// Super explicit first paragraph because this shows up at the top level and
// trips up people who are just looking for basic Serialize / Deserialize
// documentation.
//
/// Helper macro when implementing the `Deserializer` part of a new data format
/// for Serde.
///
@ -123,7 +122,7 @@ macro_rules! forward_to_deserialize_any {
macro_rules! forward_to_deserialize_any_method {
($func:ident<$l:tt, $v:ident>($($arg:ident : $ty:ty),*)) => {
#[inline]
fn $func<$v>(self, $($arg: $ty,)* visitor: $v) -> $crate::__private::Result<$v::Value, <Self as $crate::de::Deserializer<$l>>::Error>
fn $func<$v>(self, $($arg: $ty,)* visitor: $v) -> $crate::Result<$v::Value, <Self as $crate::de::Deserializer<$l>>::Error>
where
$v: $crate::de::Visitor<$l>,
{

0
serde/src/ser/fmt.rs → serde_core/src/ser/fmt.rs
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0
serde/src/ser/impls.rs → serde_core/src/ser/impls.rs
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0
serde/src/ser/impossible.rs → serde_core/src/ser/impossible.rs
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0
serde/src/ser/mod.rs → serde_core/src/ser/mod.rs
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0
serde/src/std_error.rs → serde_core/src/std_error.rs
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