put macros and traits of each type behind individual feature flags

.github/workflows/rust.yml

@@ -56,6 +56,33 @@ 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",
+          "no_std"
+        ]
+
+    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 }}
+
   test:
     name: Test
     runs-on: ${{ matrix.config.os }}

Cargo.toml

@@ -22,7 +22,11 @@ edition = "2018"
 repository = "https://github.com/not-fl3/nanoserde"
 
 [features]
-default = []
+default = ["json", "binary", "ron", "toml"]
+json = ["nanoserde-derive/json"]
+binary = ["nanoserde-derive/binary"]
+ron = ["nanoserde-derive/ron"]
+toml = []
 no_std = ["dep:hashbrown"]
 
 [dependencies]

derive/Cargo.toml

@@ -11,6 +11,10 @@ proc-macro = true
 
 [features]
 default = []
+json = []
+binary = []
+ron = []
+toml = []
 no_std = ["dep:hashbrown"]
 
 [dependencies]

derive/src/lib.rs

@@ -1,23 +1,30 @@
 #![cfg_attr(features = "no_std", no_std)]
+#![cfg(any(feature = "binary", feature = "json", feature = "ron"))]
 
 extern crate alloc;
 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 +44,7 @@ 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 +65,7 @@ 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 +85,7 @@ 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 +105,7 @@ 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 +125,7 @@ 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

@@ -196,10 +196,12 @@ impl Generic {
         }
     }
 
+    #[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(" + "),
@@ -414,6 +416,7 @@ impl Category {
 }
 
 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.
 //!
@@ -26,14 +24,22 @@ extern crate alloc;
 
 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::collections::{BTreeSet, HashMap, HashSet, LinkedList};
 
 use nanoserde::{DeBin, SerBin};

tests/json.rs

@@ -1,3 +1,4 @@
+#![cfg(feature = "json")]
 use nanoserde::{DeJson, SerJson};
 
 use std::collections::{BTreeSet, HashMap, HashSet, LinkedList};

tests/ron.rs

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

tests/ser_de.rs

@@ -1,10 +1,19 @@
-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};
 
 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,
@@ -28,15 +37,24 @@ 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 +1,4 @@
+#![cfg(feature = "toml")]
 use nanoserde::TomlParser;
 
 #[test]