feat(easy): Serialization support (toml-rs#190)

src/array.rs

@@ -40,6 +40,14 @@ impl Array {
     pub fn new() -> Self {
         Default::default()
     }
+
+    #[cfg(feature = "easy")]
+    pub(crate) fn with_vec(values: Vec<Item>) -> Self {
+        Self {
+            values,
+            ..Default::default()
+        }
+    }
 }
 
 /// Formatting

src/easy/mod.rs

@@ -96,7 +96,7 @@
 //!
 //! You can serialize types in a similar fashion:
 //!
-//! ```rust,ignore
+//! ```rust
 //! use serde::Serialize;
 //!
 //! #[derive(Serialize)]
@@ -134,10 +134,13 @@ pub mod de;
 #[doc(hidden)]
 pub mod macros;
 pub mod map;
+pub mod ser;
 pub mod value;
 
 pub use crate::toml;
 #[doc(no_inline)]
 pub use de::{from_document, from_slice, from_str, Deserializer};
 #[doc(no_inline)]
+pub use ser::{to_document, to_string, to_string_pretty, to_vec, Serializer};
+#[doc(no_inline)]
 pub use value::Value;

src/easy/ser/array.rs

@@ -0,0 +1,85 @@
+use super::Error;
+
+pub(crate) struct SerializeItemArray {
+    values: Vec<crate::Item>,
+}
+
+impl SerializeItemArray {
+    pub(crate) fn new() -> Self {
+        Self { values: Vec::new() }
+    }
+
+    pub(crate) fn with_capacity(len: usize) -> Self {
+        Self {
+            values: Vec::with_capacity(len),
+        }
+    }
+}
+
+impl serde::ser::SerializeSeq for SerializeItemArray {
+    type Ok = crate::Item;
+    type Error = Error;
+
+    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
+    where
+        T: serde::ser::Serialize,
+    {
+        let value = value.serialize(super::ItemSerializer {})?;
+        self.values.push(value);
+        Ok(())
+    }
+
+    fn end(self) -> Result<Self::Ok, Self::Error> {
+        Ok(crate::Item::Value(crate::Value::Array(
+            crate::Array::with_vec(self.values),
+        )))
+    }
+}
+
+impl serde::ser::SerializeTuple for SerializeItemArray {
+    type Ok = crate::Item;
+    type Error = Error;
+
+    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
+    where
+        T: serde::ser::Serialize,
+    {
+        serde::ser::SerializeSeq::serialize_element(self, value)
+    }
+
+    fn end(self) -> Result<Self::Ok, Self::Error> {
+        serde::ser::SerializeSeq::end(self)
+    }
+}
+
+impl serde::ser::SerializeTupleVariant for SerializeItemArray {
+    type Ok = crate::Item;
+    type Error = Error;
+
+    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
+    where
+        T: serde::ser::Serialize,
+    {
+        serde::ser::SerializeSeq::serialize_element(self, value)
+    }
+
+    fn end(self) -> Result<Self::Ok, Self::Error> {
+        serde::ser::SerializeSeq::end(self)
+    }
+}
+
+impl serde::ser::SerializeTupleStruct for SerializeItemArray {
+    type Ok = crate::Item;
+    type Error = Error;
+
+    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
+    where
+        T: serde::ser::Serialize,
+    {
+        serde::ser::SerializeSeq::serialize_element(self, value)
+    }
+
+    fn end(self) -> Result<Self::Ok, Self::Error> {
+        serde::ser::SerializeSeq::end(self)
+    }
+}

src/easy/ser/item.rs

@@ -0,0 +1,181 @@
+use super::{Error, ErrorKind};
+
+pub(crate) struct ItemSerializer {}
+
+impl serde::ser::Serializer for ItemSerializer {
+    type Ok = crate::Item;
+    type Error = Error;
+    type SerializeSeq = super::SerializeItemArray;
+    type SerializeTuple = super::SerializeItemArray;
+    type SerializeTupleStruct = super::SerializeItemArray;
+    type SerializeTupleVariant = super::SerializeItemArray;
+    type SerializeMap = super::SerializeItemTable;
+    type SerializeStruct = super::SerializeItemTable;
+    type SerializeStructVariant = serde::ser::Impossible<Self::Ok, Self::Error>;
+
+    fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error> {
+        Ok(crate::Item::Value(v.into()))
+    }
+
+    fn serialize_i8(self, v: i8) -> Result<Self::Ok, Self::Error> {
+        self.serialize_i64(v as i64)
+    }
+
+    fn serialize_i16(self, v: i16) -> Result<Self::Ok, Self::Error> {
+        self.serialize_i64(v as i64)
+    }
+
+    fn serialize_i32(self, v: i32) -> Result<Self::Ok, Self::Error> {
+        self.serialize_i64(v as i64)
+    }
+
+    fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error> {
+        Ok(crate::Item::Value(v.into()))
+    }
+
+    fn serialize_u8(self, v: u8) -> Result<Self::Ok, Self::Error> {
+        self.serialize_i64(v as i64)
+    }
+
+    fn serialize_u16(self, v: u16) -> Result<Self::Ok, Self::Error> {
+        self.serialize_i64(v as i64)
+    }
+
+    fn serialize_u32(self, v: u32) -> Result<Self::Ok, Self::Error> {
+        self.serialize_i64(v as i64)
+    }
+
+    fn serialize_u64(self, v: u64) -> Result<Self::Ok, Self::Error> {
+        self.serialize_i64(v as i64)
+    }
+
+    fn serialize_f32(self, v: f32) -> Result<Self::Ok, Self::Error> {
+        self.serialize_f64(v as f64)
+    }
+
+    fn serialize_f64(self, v: f64) -> Result<Self::Ok, Self::Error> {
+        Ok(crate::Item::Value(v.into()))
+    }
+
+    fn serialize_char(self, v: char) -> Result<Self::Ok, Self::Error> {
+        let mut buf = [0; 4];
+        self.serialize_str(v.encode_utf8(&mut buf))
+    }
+
+    fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
+        Ok(crate::Item::Value(v.into()))
+    }
+
+    fn serialize_bytes(self, value: &[u8]) -> Result<Self::Ok, Self::Error> {
+        use serde::ser::Serialize;
+        value.serialize(self)
+    }
+
+    fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
+        Err(ErrorKind::UnsupportedNone.into())
+    }
+
+    fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
+    where
+        T: serde::ser::Serialize,
+    {
+        value.serialize(self)
+    }
+
+    fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
+        Err(ErrorKind::UnsupportedType.into())
+    }
+
+    fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
+        Err(ErrorKind::UnsupportedType.into())
+    }
+
+    fn serialize_unit_variant(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        variant: &'static str,
+    ) -> Result<Self::Ok, Self::Error> {
+        self.serialize_str(variant)
+    }
+
+    fn serialize_newtype_struct<T: ?Sized>(
+        self,
+        _name: &'static str,
+        value: &T,
+    ) -> Result<Self::Ok, Self::Error>
+    where
+        T: serde::ser::Serialize,
+    {
+        value.serialize(self)
+    }
+
+    fn serialize_newtype_variant<T: ?Sized>(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        _variant: &'static str,
+        _value: &T,
+    ) -> Result<Self::Ok, Self::Error>
+    where
+        T: serde::ser::Serialize,
+    {
+        Err(ErrorKind::UnsupportedType.into())
+    }
+
+    fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
+        let serializer = match len {
+            Some(len) => super::SerializeItemArray::with_capacity(len),
+            None => super::SerializeItemArray::new(),
+        };
+        Ok(serializer)
+    }
+
+    fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, Self::Error> {
+        self.serialize_seq(Some(len))
+    }
+
+    fn serialize_tuple_struct(
+        self,
+        _name: &'static str,
+        len: usize,
+    ) -> Result<Self::SerializeTupleStruct, Self::Error> {
+        self.serialize_seq(Some(len))
+    }
+
+    fn serialize_tuple_variant(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        _variant: &'static str,
+        len: usize,
+    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
+        self.serialize_seq(Some(len))
+    }
+
+    fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
+        let serializer = match len {
+            Some(len) => super::SerializeItemTable::with_capacity(len),
+            None => super::SerializeItemTable::new(),
+        };
+        Ok(serializer)
+    }
+
+    fn serialize_struct(
+        self,
+        _name: &'static str,
+        len: usize,
+    ) -> Result<Self::SerializeStruct, Self::Error> {
+        self.serialize_map(Some(len))
+    }
+
+    fn serialize_struct_variant(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        _variant: &'static str,
+        _len: usize,
+    ) -> Result<Self::SerializeStructVariant, Self::Error> {
+        Err(ErrorKind::UnsupportedType.into())
+    }
+}