put macros and traits of each type behind individual feature flags

.github/workflows/rust.yml

@@ -56,6 +56,58 @@ jobs:
           command: build
           args: --all-targets --target=${{ matrix.config.target }}
 
+  features:
+    name: Test Individual Features
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        feature: [
+          "binary",
+          "json",
+          "ron",
+          "toml",
+        ]
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          target: x86_64-unknown-linux-gnu
+          override: true
+
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --no-default-features --features ${{ matrix.feature }}
+
+  no_std_features:
+    name: Test Individual Features NoStd
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        feature: [
+          "binary",
+          "json",
+          "ron",
+          "toml",
+        ]
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          target: x86_64-unknown-linux-gnu
+          override: true
+
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --no-default-features --features "no_std, ${{ matrix.feature }}"
+
   test:
     name: Test
     runs-on: ${{ matrix.config.os }}

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "nanoserde"
-version = "0.1.37"
+version = "0.2.0"
 authors = ["makepad <[email protected]>", "Fedor <[email protected]>"]
 license = "MIT OR Apache-2.0"
 description = """
@@ -22,9 +22,13 @@ edition = "2018"
 repository = "https://github.com/not-fl3/nanoserde"
 
 [features]
-default = []
+default = ["json", "binary", "ron", "toml"]
+json = ["dep:nanoserde-derive", "nanoserde-derive/json"]
+binary = ["dep:nanoserde-derive", "nanoserde-derive/binary"]
+ron = ["dep:nanoserde-derive", "nanoserde-derive/ron"]
+toml = []
 no_std = ["dep:hashbrown"]
 
 [dependencies]
 hashbrown = { version = "0.12.3", optional = true }
-nanoserde-derive = { path = "derive", version = "=0.1.22" }
+nanoserde-derive = { path = "derive", version = "=0.2.0", optional = true }

README.md

@@ -52,3 +52,17 @@ For more examples take a look at [tests](/tests)
 | container attribute: `#[nserde(proxy = "")]`   | yes    | yes   | no     | no    |
 | container attribute: `#[nserde(transparent)]`  | yes    | no    | no     | no    |
 
+## Crate features:
+
+All features are enabled by default. To enable only specific formats, import nanoserde using 
+```toml
+nanoserde = { version = "*", default-features = false, features = [] }
+```
+in your `Cargo.toml` and add one or more of the following crate features:
+
+| Format    | Feature Name   | 
+| ----------| -------------- |
+| Binary    | `binary`       | 
+| JSON      | `json`         | 
+| RON       | `ron`          |
+| TOML      | `toml`         |

derive/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "nanoserde-derive"
-version = "0.1.22"
+version = "0.2.0"
 authors = ["Makepad <[email protected]>", "Fedor <[email protected]>"]
 edition = "2018"
 description = "Fork of makepad-tinyserde derive without any external dependencies"
@@ -11,6 +11,9 @@ proc-macro = true
 
 [features]
 default = []
+json = []
+binary = []
+ron = []
 no_std = ["dep:hashbrown"]
 
 [dependencies]

derive/src/lib.rs

@@ -6,18 +6,24 @@ extern crate proc_macro;
 #[macro_use]
 mod shared;
 
+#[cfg(feature = "binary")]
 mod serde_bin;
+#[cfg(feature = "binary")]
 use crate::serde_bin::*;
 
+#[cfg(feature = "ron")]
 mod serde_ron;
+#[cfg(feature = "ron")]
 use crate::serde_ron::*;
 
+#[cfg(feature = "json")]
 mod serde_json;
+#[cfg(feature = "json")]
+use crate::serde_json::*;
 
 mod parse;
 
-use crate::serde_json::*;
-
+#[cfg(feature = "binary")]
 #[proc_macro_derive(SerBin, attributes(nserde))]
 pub fn derive_ser_bin(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
     let input = parse::parse_data(input);
@@ -37,6 +43,7 @@ pub fn derive_ser_bin(input: proc_macro::TokenStream) -> proc_macro::TokenStream
     ts
 }
 
+#[cfg(feature = "binary")]
 #[proc_macro_derive(DeBin, attributes(nserde))]
 pub fn derive_de_bin(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
     let input = parse::parse_data(input);
@@ -57,6 +64,7 @@ pub fn derive_de_bin(input: proc_macro::TokenStream) -> proc_macro::TokenStream
     ts
 }
 
+#[cfg(feature = "ron")]
 #[proc_macro_derive(SerRon, attributes(nserde))]
 pub fn derive_ser_ron(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
     let input = parse::parse_data(input);
@@ -76,6 +84,7 @@ pub fn derive_ser_ron(input: proc_macro::TokenStream) -> proc_macro::TokenStream
     ts
 }
 
+#[cfg(feature = "ron")]
 #[proc_macro_derive(DeRon, attributes(nserde))]
 pub fn derive_de_ron(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
     let input = parse::parse_data(input);
@@ -95,6 +104,7 @@ pub fn derive_de_ron(input: proc_macro::TokenStream) -> proc_macro::TokenStream
     ts
 }
 
+#[cfg(feature = "json")]
 #[proc_macro_derive(SerJson, attributes(nserde))]
 pub fn derive_ser_json(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
     let input = parse::parse_data(input);
@@ -114,6 +124,7 @@ pub fn derive_ser_json(input: proc_macro::TokenStream) -> proc_macro::TokenStrea
     ts
 }
 
+#[cfg(feature = "json")]
 #[proc_macro_derive(DeJson, attributes(nserde))]
 pub fn derive_de_json(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
     let input = parse::parse_data(input);

derive/src/parse.rs

@@ -16,7 +16,7 @@
 
 #[derive(Debug, Clone)]
 pub struct Attribute {
     pub name: String,
     pub tokens: Vec<String>,
 }
 
@@ -37,7 +37,7 @@
 #[derive(Debug, Clone)]
 pub struct Field {
     pub attributes: Vec<Attribute>,
     pub vis: Visibility,
     pub field_name: Option<String>,
     pub ty: Type,
 }
@@ -131,7 +131,7 @@
     pub named: bool,
     pub fields: Vec<Field>,
     pub attributes: Vec<Attribute>,
     pub generics: Vec<Generic>,
 }
 
 #[derive(Debug)]
@@ -139,7 +139,7 @@
     pub name: String,
     pub variants: Vec<Field>,
     pub attributes: Vec<Attribute>,
     pub generics: Vec<Generic>,
 }
 
 #[allow(dead_code)]
@@ -195,10 +195,12 @@
         }
     }
 
+    #[cfg(any(feature = "binary", feature = "json"))]
     pub fn ident_only(&self) -> String {
         format!("{}{}", self.lifetime_prefix(), self.full())
     }
 
+    #[cfg(any(feature = "binary", feature = "json"))]
     pub fn full_with_const(&self, extra_bounds: &[&str], bounds: bool) -> String {
         let bounds = match (bounds, &self) {
             (true, Generic::Lifetime { .. }) => self.get_bounds().join(" + "),
@@ -412,6 +414,7 @@
 }
 
 impl Type {
+    #[cfg(any(feature = "ron", feature = "json"))]
     pub fn base(&self) -> String {
         let mut base = match &self.ref_type {
             Some(inner) => match inner {

derive/src/shared.rs

@@ -1,5 +1,6 @@
 use alloc::string::String;
 
+#[cfg(any(feature = "binary", feature = "json"))]
 use crate::parse::{Enum, Struct};
 
 macro_rules! l {
@@ -22,6 +23,7 @@ pub fn attrs_proxy(attributes: &[crate::parse::Attribute]) -> Option<String> {
     })
 }
 
+#[cfg(any(feature = "ron", feature = "json"))]
 pub fn attrs_rename(attributes: &[crate::parse::Attribute]) -> Option<String> {
     attributes.iter().find_map(|attr| {
         if attr.tokens.len() == 2 && attr.tokens[0] == "rename" {
@@ -32,6 +34,7 @@ pub fn attrs_rename(attributes: &[crate::parse::Attribute]) -> Option<String> {
     })
 }
 
+#[cfg(any(feature = "ron", feature = "json"))]
 pub fn attrs_default(attributes: &[crate::parse::Attribute]) -> Option<Option<String>> {
     attributes.iter().find_map(|attr| {
         if attr.tokens.len() == 1 && attr.tokens[0] == "default" {
@@ -44,6 +47,7 @@ pub fn attrs_default(attributes: &[crate::parse::Attribute]) -> Option<Option<St
     })
 }
 
+#[cfg(any(feature = "ron", feature = "json"))]
 pub fn attrs_default_with(attributes: &[crate::parse::Attribute]) -> Option<String> {
     attributes.iter().find_map(|attr| {
         if attr.tokens.len() == 2 && attr.tokens[0] == "default_with" {
@@ -54,18 +58,21 @@ pub fn attrs_default_with(attributes: &[crate::parse::Attribute]) -> Option<Stri
     })
 }
 
+#[cfg(feature = "json")]
 pub fn attrs_transparent(attributes: &[crate::parse::Attribute]) -> bool {
     attributes
         .iter()
         .any(|attr| attr.tokens.len() == 1 && attr.tokens[0] == "transparent")
 }
 
+#[cfg(feature = "json")]
 pub fn attrs_skip(attributes: &[crate::parse::Attribute]) -> bool {
     attributes
         .iter()
         .any(|attr| attr.tokens.len() == 1 && attr.tokens[0] == "skip")
 }
 
+#[cfg(any(feature = "binary", feature = "json"))]
 pub(crate) fn struct_bounds_strings(struct_: &Struct, bound_name: &str) -> (String, String) {
     let generics: &Vec<_> = &struct_.generics;
 
@@ -90,6 +97,7 @@ pub(crate) fn struct_bounds_strings(struct_: &Struct, bound_name: &str) -> (Stri
     return (generic_w_bounds, generic_no_bounds);
 }
 
+#[cfg(any(feature = "binary", feature = "json"))]
 pub(crate) fn enum_bounds_strings(enum_: &Enum, bound_name: &str) -> (String, String) {
     let generics: &Vec<_> = &enum_.generics;
 

src/lib.rs

@@ -7,8 +7,6 @@
 //!
 //! Data serialization library with zero dependencies. No more syn/proc_macro2/quote in the build tree!
 //!
-//! `nanoserde` also almost do not use any generics, so build size is not going to be bloated with monomorphizated code.
-//!
 //! The main difference with "serde" and the reason why "nanoserde" is possible: there is no intermediate data model
 //! For each serialisation datatype there is a special macro.
 //!
@@ -20,20 +18,30 @@
 #![cfg_attr(feature = "no_std", no_std)]
 // Possibly stable in 1.65.
 // See: https://github.com/rust-lang/rust/pull/99917
+// and https://github.com/rust-lang/rust/issues/103765
 #![cfg_attr(feature = "no_std", feature(error_in_core))]
 
 extern crate alloc;
 
+#[cfg(any(feature = "binary", feature = "json", feature = "ron"))]
 pub use nanoserde_derive::*;
 
+#[cfg(feature = "binary")]
 mod serde_bin;
+#[cfg(feature = "binary")]
 pub use crate::serde_bin::*;
 
+#[cfg(feature = "ron")]
 mod serde_ron;
+#[cfg(feature = "ron")]
 pub use crate::serde_ron::*;
 
+#[cfg(feature = "json")]
 mod serde_json;
+#[cfg(feature = "json")]
 pub use crate::serde_json::*;
 
+#[cfg(feature = "toml")]
 mod toml;
+#[cfg(feature = "toml")]
 pub use crate::toml::*;

tests/bin.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "binary")]
 use std::{
     array,
     collections::{BTreeSet, LinkedList},
@@ -6,7 +7,6 @@ use std::{
 
 #[cfg(feature = "no_std")]
 use hashbrown::{HashMap, HashSet};
-
 #[cfg(not(feature = "no_std"))]
 use std::collections::{HashMap, HashSet};
 

tests/json.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "json")]
 use nanoserde::{DeJson, SerJson};
 
 use std::{
@@ -71,7 +72,7 @@
 fn de_illegal_inline_comment() {
     #[derive(DeJson)]
     pub struct Test {
         pub a: f32,
     }
 
     let jsons = vec![
@@ -94,7 +95,7 @@
 fn de_illegal_multiline_comment() {
     #[derive(DeJson)]
     pub struct Test {
         pub a: f32,
     }
 
     let jsons = vec![

tests/parse.rs

@@ -1,3 +1,4 @@
+#![cfg(all(feature = "binary", feature = "json", feature = "ron"))]
 use nanoserde::{DeBin, DeJson, DeRon, SerBin, SerJson, SerRon};
 
 // https://github.com/not-fl3/nanoserde/issues/83

tests/ron.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "ron")]
 use nanoserde::{DeRon, SerRon};
 
 use std::{

tests/ser_de.rs

@@ -1,4 +1,10 @@
-use nanoserde::{DeBin, DeJson, DeRon, SerBin, SerJson, SerRon};
+#![cfg(any(feature = "binary", feature = "json", feature = "ron"))]
+#[cfg(feature = "binary")]
+use nanoserde::{DeBin, SerBin};
+#[cfg(feature = "json")]
+use nanoserde::{DeJson, SerJson};
+#[cfg(feature = "ron")]
+use nanoserde::{DeRon, SerRon};
 
 #[cfg(feature = "no_std")]
 use hashbrown::HashMap;
@@ -8,7 +14,10 @@ use std::collections::HashMap;
 
 #[test]
 fn ser_de() {
-    #[derive(DeBin, SerBin, DeJson, SerJson, DeRon, SerRon, PartialEq, Debug)]
+    #[derive(PartialEq, Debug)]
+    #[cfg_attr(feature = "binary", derive(DeBin, SerBin))]
+    #[cfg_attr(feature = "json", derive(DeJson, SerJson))]
+    #[cfg_attr(feature = "ron", derive(DeRon, SerRon))]
     pub struct Test {
         pub a: i32,
         pub b: f32,
@@ -32,15 +41,24 @@ fn ser_de() {
         g: (),
     };
 
-    let bytes = SerBin::serialize_bin(&test);
-    let test_deserialized = DeBin::deserialize_bin(&bytes).unwrap();
-    assert_eq!(test, test_deserialized);
+    #[cfg(feature = "binary")]
+    {
+        let bytes = SerBin::serialize_bin(&test);
+        let test_deserialized = DeBin::deserialize_bin(&bytes).unwrap();
+        assert_eq!(test, test_deserialized);
+    }
 
-    let bytes = SerJson::serialize_json(&test);
-    let test_deserialized = DeJson::deserialize_json(&bytes).unwrap();
-    assert_eq!(test, test_deserialized);
+    #[cfg(feature = "json")]
+    {
+        let bytes = SerJson::serialize_json(&test);
+        let test_deserialized = DeJson::deserialize_json(&bytes).unwrap();
+        assert_eq!(test, test_deserialized);
+    }
 
-    let bytes = SerRon::serialize_ron(&test);
-    let test_deserialized = DeRon::deserialize_ron(&bytes).unwrap();
-    assert_eq!(test, test_deserialized);
+    #[cfg(feature = "ron")]
+    {
+        let bytes = SerRon::serialize_ron(&test);
+        let test_deserialized = DeRon::deserialize_ron(&bytes).unwrap();
+        assert_eq!(test, test_deserialized);
+    }
 }

tests/toml.rs

@@ -1,3 +1,5 @@
+#![cfg(feature = "toml")]
+
 #[cfg(feature = "no_std")]
 use hashbrown::HashMap;
 #[cfg(not(feature = "no_std"))]