no std + schema

.gitignore

@@ -1,5 +1,4 @@
 /target/
-/Cargo.lock
 /.gitattributes
 /.idea/
 *.iml

Cargo.toml

@@ -10,8 +10,19 @@ readme = "README.md"
 keywords = ["serde", "wasm"]
 license = "MIT"
 
+[features]
+default = ["std"]
+
+std = []
+schema = ["std", "dep:schemars"]
+
 [dependencies]
-serde = "^1.0.0"
+serde = { version = "1.0.103", default-features = false, features = [
+    "derive",
+    "alloc",
+] }
+schemars = { version = "0.8.3", optional = true }
+
 
 [dev-dependencies]
 serde_derive = "^1.0.0"

src/de.rs

@@ -1,10 +1,6 @@
-use serde::{de, forward_to_deserialize_any};
-use std::collections::BTreeMap;
-use std::error::Error;
-use std::fmt;
-use std::marker::PhantomData;
-
+use crate::no_std::*;
 use crate::Value;
+use serde::{de, forward_to_deserialize_any};
 
 #[derive(Debug)]
 pub enum Unexpected {

src/lib.rs

@@ -1,12 +1,17 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+#![feature(error_in_core)]
+
+#[cfg(not(feature = "std"))]
+extern crate alloc;
+
+use crate::no_std::*;
 use serde::Deserialize;
-use std::cmp::Ordering;
-use std::collections::BTreeMap;
-use std::hash::{Hash, Hasher};
 
 pub use de::*;
 pub use ser::*;
 
 mod de;
+mod no_std;
 mod ser;
 
 #[derive(Clone, Debug)]
@@ -113,6 +118,17 @@ impl Ord for Value {
     }
 }
 
+#[cfg(feature = "schema")]
+impl schemars::JsonSchema for Value {
+    fn schema_name() -> String {
+        "JSON".to_string()
+    }
+
+    fn json_schema(_gen: &mut schemars::gen::SchemaGenerator) -> schemars::schema::Schema {
+        schemars::schema::Schema::from(true)
+    }
+}
+
 impl Value {
     fn discriminant(&self) -> usize {
         match *self {

src/no_std.rs

@@ -0,0 +1,32 @@
+#[cfg(feature = "std")]
+pub use std::{
+    borrow::ToOwned,
+    boxed::Box,
+    cmp::Ordering,
+    collections::BTreeMap,
+    error::Error,
+    fmt,
+    hash::{Hash, Hasher},
+    marker::PhantomData,
+    string::{String, ToString},
+    vec,
+    vec::Vec,
+};
+
+#[cfg(not(feature = "std"))]
+pub use alloc::{
+    borrow::ToOwned,
+    boxed::Box,
+    collections::BTreeMap,
+    string::{String, ToString},
+    vec,
+    vec::Vec,
+};
+#[cfg(not(feature = "std"))]
+pub use core::{
+    cmp::Ordering,
+    error::Error,
+    fmt,
+    hash::{Hash, Hasher},
+    marker::PhantomData,
+};

src/ser.rs

@@ -1,9 +1,6 @@
-use serde::ser;
-use std::collections::BTreeMap;
-use std::error::Error;
-use std::fmt;
-
+use crate::no_std::*;
 use crate::Value;
+use serde::ser;
 
 #[derive(Debug)]
 pub enum SerializerError {