634 lines
18 KiB
Rust
634 lines
18 KiB
Rust
//! Implement serialization support of `Dynamic` for [`serde`](https://crates.io/crates/serde).
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use crate::any::Dynamic;
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use crate::result::EvalAltResult;
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use crate::token::Position;
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#[cfg(not(feature = "no_index"))]
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use crate::engine::Array;
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#[cfg(not(feature = "no_object"))]
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use crate::engine::Map;
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use serde::ser::{
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Error, SerializeMap, SerializeSeq, SerializeStruct, SerializeTuple, SerializeTupleStruct,
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Serializer,
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};
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use serde::Serialize;
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#[cfg(not(any(feature = "no_object", feature = "no_index")))]
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use serde::ser::SerializeTupleVariant;
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#[cfg(not(feature = "no_object"))]
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use serde::ser::SerializeStructVariant;
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use crate::stdlib::{boxed::Box, fmt, string::ToString};
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#[cfg(not(feature = "no_object"))]
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use crate::stdlib::mem;
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/// Serializer for `Dynamic` which is kept as a reference.
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pub struct DynamicSerializer {
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/// Buffer to hold a temporary key.
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_key: Dynamic,
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/// Buffer to hold a temporary value.
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_value: Dynamic,
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}
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impl DynamicSerializer {
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/// Create a `DynamicSerializer` from a `Dynamic` value.
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pub fn new(_value: Dynamic) -> Self {
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Self {
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_key: Default::default(),
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_value,
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}
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}
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}
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/// Serialize a Rust type that implements `serde::Serialize` into a `Dynamic`.
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///
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/// # Examples
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///
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/// ```
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/// # fn main() -> Result<(), Box<rhai::EvalAltResult>> {
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/// # #[cfg(not(feature = "no_index"))]
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/// # #[cfg(not(feature = "no_object"))]
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/// # #[cfg(not(feature = "no_float"))]
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/// # {
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/// use rhai::{Dynamic, Array, Map, INT};
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/// use rhai::ser::to_dynamic;
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/// use serde::Serialize;
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///
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/// #[derive(Debug, serde::Serialize, PartialEq)]
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/// struct Point {
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/// x: f64,
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/// y: f64
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/// }
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///
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/// #[derive(Debug, serde::Serialize, PartialEq)]
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/// struct MyStruct {
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/// a: i64,
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/// b: Vec<String>,
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/// c: bool,
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/// d: Point
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/// }
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///
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/// let x = MyStruct {
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/// a: 42,
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/// b: vec![ "hello".into(), "world".into() ],
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/// c: true,
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/// d: Point { x: 123.456, y: 999.0 }
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/// };
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///
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/// // Convert the 'MyStruct' into a 'Dynamic'
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/// let value = to_dynamic(x)?;
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///
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/// assert!(value.is::<Map>());
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///
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/// let map = value.cast::<Map>();
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/// let point = map.get("d").unwrap().downcast_ref::<Map>().unwrap();
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/// assert_eq!(*point.get("x").unwrap().downcast_ref::<f64>().unwrap(), 123.456);
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/// assert_eq!(*point.get("y").unwrap().downcast_ref::<f64>().unwrap(), 999.0);
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/// # }
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/// # Ok(())
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/// # }
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/// ```
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pub fn to_dynamic<T: Serialize>(value: T) -> Result<Dynamic, Box<EvalAltResult>> {
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let mut s = DynamicSerializer::new(Default::default());
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value.serialize(&mut s)
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}
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impl Error for Box<EvalAltResult> {
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fn custom<T: fmt::Display>(err: T) -> Self {
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Box::new(EvalAltResult::ErrorRuntime(
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err.to_string(),
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Position::none(),
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))
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}
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}
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impl Serializer for &mut DynamicSerializer {
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type Ok = Dynamic;
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type Error = Box<EvalAltResult>;
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type SerializeSeq = DynamicSerializer;
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type SerializeTuple = DynamicSerializer;
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type SerializeTupleStruct = DynamicSerializer;
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#[cfg(not(any(feature = "no_object", feature = "no_index")))]
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type SerializeTupleVariant = TupleVariantSerializer;
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#[cfg(any(feature = "no_object", feature = "no_index"))]
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type SerializeTupleVariant = serde::ser::Impossible<Dynamic, Box<EvalAltResult>>;
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type SerializeMap = DynamicSerializer;
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type SerializeStruct = DynamicSerializer;
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#[cfg(not(feature = "no_object"))]
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type SerializeStructVariant = StructVariantSerializer;
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#[cfg(feature = "no_object")]
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type SerializeStructVariant = serde::ser::Impossible<Dynamic, Box<EvalAltResult>>;
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fn serialize_bool(self, v: bool) -> Result<Self::Ok, Box<EvalAltResult>> {
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Ok(v.into())
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}
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fn serialize_i8(self, v: i8) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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return self.serialize_i64(i64::from(v));
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#[cfg(feature = "only_i32")]
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return self.serialize_i32(i32::from(v));
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}
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fn serialize_i16(self, v: i16) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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return self.serialize_i64(i64::from(v));
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#[cfg(feature = "only_i32")]
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return self.serialize_i32(i32::from(v));
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}
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fn serialize_i32(self, v: i32) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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return self.serialize_i64(i64::from(v));
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#[cfg(feature = "only_i32")]
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return Ok(v.into());
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}
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fn serialize_i64(self, v: i64) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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return Ok(v.into());
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#[cfg(feature = "only_i32")]
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if v > i32::MAX as i64 {
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return Ok(Dynamic::from(v));
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} else {
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return self.serialize_i32(v as i32);
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}
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}
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fn serialize_i128(self, v: i128) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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if v > i64::MAX as i128 {
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return Ok(Dynamic::from(v));
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} else {
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return self.serialize_i64(v as i64);
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}
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#[cfg(feature = "only_i32")]
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if v > i32::MAX as i128 {
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return Ok(Dynamic::from(v));
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} else {
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return self.serialize_i32(v as i32);
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}
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}
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fn serialize_u8(self, v: u8) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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return self.serialize_i64(i64::from(v));
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#[cfg(feature = "only_i32")]
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return self.serialize_i32(i32::from(v));
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}
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fn serialize_u16(self, v: u16) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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return self.serialize_i64(i64::from(v));
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#[cfg(feature = "only_i32")]
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return self.serialize_i32(i32::from(v));
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}
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fn serialize_u32(self, v: u32) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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return self.serialize_i64(i64::from(v));
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#[cfg(feature = "only_i32")]
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if v > i32::MAX as u32 {
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return Ok(Dynamic::from(v));
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} else {
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return self.serialize_i32(v as i32);
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}
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}
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fn serialize_u64(self, v: u64) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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if v > i64::MAX as u64 {
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return Ok(Dynamic::from(v));
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} else {
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return self.serialize_i64(v as i64);
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}
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#[cfg(feature = "only_i32")]
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if v > i32::MAX as u64 {
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return Ok(Dynamic::from(v));
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} else {
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return self.serialize_i32(v as i32);
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}
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}
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fn serialize_u128(self, v: u128) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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if v > i64::MAX as u128 {
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return Ok(Dynamic::from(v));
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} else {
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return self.serialize_i64(v as i64);
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}
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#[cfg(feature = "only_i32")]
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if v > i32::MAX as u128 {
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return Ok(Dynamic::from(v));
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} else {
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return self.serialize_i32(v as i32);
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}
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}
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fn serialize_f32(self, v: f32) -> Result<Self::Ok, Box<EvalAltResult>> {
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Ok(Dynamic::from(v))
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}
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fn serialize_f64(self, v: f64) -> Result<Self::Ok, Box<EvalAltResult>> {
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Ok(Dynamic::from(v))
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}
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fn serialize_char(self, v: char) -> Result<Self::Ok, Box<EvalAltResult>> {
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Ok(v.into())
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}
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fn serialize_str(self, v: &str) -> Result<Self::Ok, Box<EvalAltResult>> {
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Ok(v.to_string().into())
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}
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fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok, Box<EvalAltResult>> {
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Ok(Dynamic::from(v.to_vec()))
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}
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fn serialize_none(self) -> Result<Self::Ok, Box<EvalAltResult>> {
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Ok(().into())
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}
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fn serialize_some<T: ?Sized + Serialize>(
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self,
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value: &T,
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) -> Result<Self::Ok, Box<EvalAltResult>> {
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value.serialize(&mut *self)
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}
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fn serialize_unit(self) -> Result<Self::Ok, Box<EvalAltResult>> {
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Ok(().into())
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}
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fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Box<EvalAltResult>> {
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self.serialize_unit()
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}
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fn serialize_unit_variant(
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self,
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_name: &'static str,
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_variant_index: u32,
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variant: &'static str,
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) -> Result<Self::Ok, Box<EvalAltResult>> {
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self.serialize_str(variant)
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}
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fn serialize_newtype_struct<T: ?Sized + Serialize>(
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self,
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_name: &'static str,
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value: &T,
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) -> Result<Self::Ok, Box<EvalAltResult>> {
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value.serialize(&mut *self)
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}
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fn serialize_newtype_variant<T: ?Sized + Serialize>(
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self,
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_name: &'static str,
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_variant_index: u32,
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_variant: &'static str,
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_value: &T,
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) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "no_object"))]
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{
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let content = to_dynamic(_value)?;
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make_variant(_variant, content)
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}
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#[cfg(feature = "no_object")]
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return Err(Box::new(EvalAltResult::ErrorMismatchOutputType(
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"Dynamic".into(),
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"map".into(),
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Position::none(),
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)));
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}
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fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Box<EvalAltResult>> {
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#[cfg(not(feature = "no_index"))]
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return Ok(DynamicSerializer::new(Array::new().into()));
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#[cfg(feature = "no_index")]
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return Err(Box::new(EvalAltResult::ErrorMismatchOutputType(
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"Dynamic".into(),
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"array".into(),
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Position::none(),
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)));
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}
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fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, Box<EvalAltResult>> {
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self.serialize_seq(Some(len))
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}
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fn serialize_tuple_struct(
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self,
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_name: &'static str,
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len: usize,
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) -> Result<Self::SerializeTupleStruct, Box<EvalAltResult>> {
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self.serialize_seq(Some(len))
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}
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fn serialize_tuple_variant(
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self,
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_name: &'static str,
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_variant_index: u32,
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_variant: &'static str,
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_len: usize,
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) -> Result<Self::SerializeTupleVariant, Box<EvalAltResult>> {
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#[cfg(not(any(feature = "no_object", feature = "no_index")))]
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return Ok(TupleVariantSerializer {
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variant: _variant,
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array: Array::with_capacity(_len),
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});
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#[cfg(any(feature = "no_object", feature = "no_index"))]
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{
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#[cfg(feature = "no_object")]
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let err_type = "map";
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#[cfg(not(feature = "no_object"))]
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let err_type = "array";
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Err(Box::new(EvalAltResult::ErrorMismatchOutputType(
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"Dynamic".into(),
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err_type.into(),
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Position::none(),
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)))
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}
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}
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fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Box<EvalAltResult>> {
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#[cfg(not(feature = "no_object"))]
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return Ok(DynamicSerializer::new(Map::new().into()));
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#[cfg(feature = "no_object")]
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return Err(Box::new(EvalAltResult::ErrorMismatchOutputType(
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"Dynamic".into(),
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"map".into(),
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Position::none(),
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)));
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}
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fn serialize_struct(
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self,
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_name: &'static str,
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len: usize,
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) -> Result<Self::SerializeStruct, Box<EvalAltResult>> {
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self.serialize_map(Some(len))
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}
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fn serialize_struct_variant(
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self,
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_name: &'static str,
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_variant_index: u32,
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_variant: &'static str,
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_len: usize,
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) -> Result<Self::SerializeStructVariant, Box<EvalAltResult>> {
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#[cfg(not(feature = "no_object"))]
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return Ok(StructVariantSerializer {
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variant: _variant,
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map: Map::with_capacity(_len),
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});
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#[cfg(feature = "no_object")]
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return Err(Box::new(EvalAltResult::ErrorMismatchOutputType(
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"Dynamic".into(),
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"map".into(),
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Position::none(),
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)));
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}
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}
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impl SerializeSeq for DynamicSerializer {
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type Ok = Dynamic;
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type Error = Box<EvalAltResult>;
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fn serialize_element<T: ?Sized + Serialize>(
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&mut self,
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_value: &T,
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) -> Result<(), Box<EvalAltResult>> {
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#[cfg(not(feature = "no_index"))]
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{
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let _value = _value.serialize(&mut *self)?;
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let arr = self._value.downcast_mut::<Array>().unwrap();
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arr.push(_value);
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Ok(())
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}
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#[cfg(feature = "no_index")]
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unreachable!()
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}
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// Close the sequence.
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fn end(self) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "no_index"))]
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return Ok(self._value);
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#[cfg(feature = "no_index")]
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unreachable!()
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}
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}
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impl SerializeTuple for DynamicSerializer {
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type Ok = Dynamic;
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type Error = Box<EvalAltResult>;
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fn serialize_element<T: ?Sized + Serialize>(
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&mut self,
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_value: &T,
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) -> Result<(), Box<EvalAltResult>> {
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#[cfg(not(feature = "no_index"))]
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{
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let _value = _value.serialize(&mut *self)?;
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let arr = self._value.downcast_mut::<Array>().unwrap();
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arr.push(_value);
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Ok(())
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}
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#[cfg(feature = "no_index")]
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unreachable!()
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}
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fn end(self) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "no_index"))]
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return Ok(self._value);
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#[cfg(feature = "no_index")]
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unreachable!()
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}
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}
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impl SerializeTupleStruct for DynamicSerializer {
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type Ok = Dynamic;
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type Error = Box<EvalAltResult>;
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fn serialize_field<T: ?Sized + Serialize>(
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&mut self,
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_value: &T,
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) -> Result<(), Box<EvalAltResult>> {
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#[cfg(not(feature = "no_index"))]
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{
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let _value = _value.serialize(&mut *self)?;
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let arr = self._value.downcast_mut::<Array>().unwrap();
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arr.push(_value);
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Ok(())
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}
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#[cfg(feature = "no_index")]
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unreachable!()
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}
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fn end(self) -> Result<Self::Ok, Box<EvalAltResult>> {
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#[cfg(not(feature = "no_index"))]
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return Ok(self._value);
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#[cfg(feature = "no_index")]
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unreachable!()
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}
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}
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impl SerializeMap for DynamicSerializer {
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type Ok = Dynamic;
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type Error = Box<EvalAltResult>;
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fn serialize_key<T: ?Sized + Serialize>(&mut self, _key: &T) -> Result<(), Box<EvalAltResult>> {
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#[cfg(not(feature = "no_object"))]
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{
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self._key = _key.serialize(&mut *self)?;
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Ok(())
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}
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#[cfg(feature = "no_object")]
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unreachable!()
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}
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|
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fn serialize_value<T: ?Sized + Serialize>(
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&mut self,
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_value: &T,
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) -> Result<(), Box<EvalAltResult>> {
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#[cfg(not(feature = "no_object"))]
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{
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let key = mem::take(&mut self._key)
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.take_immutable_string()
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.map_err(|typ| {
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Box::new(EvalAltResult::ErrorMismatchOutputType(
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"string".into(),
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typ.into(),
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Position::none(),
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))
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})?;
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let _value = _value.serialize(&mut *self)?;
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|
let map = self._value.downcast_mut::<Map>().unwrap();
|
|
map.insert(key, _value);
|
|
Ok(())
|
|
}
|
|
#[cfg(feature = "no_object")]
|
|
unreachable!()
|
|
}
|
|
|
|
fn serialize_entry<K: ?Sized + Serialize, T: ?Sized + Serialize>(
|
|
&mut self,
|
|
_key: &K,
|
|
_value: &T,
|
|
) -> Result<(), Box<EvalAltResult>> {
|
|
#[cfg(not(feature = "no_object"))]
|
|
{
|
|
let _key: Dynamic = _key.serialize(&mut *self)?;
|
|
let _key = _key.take_immutable_string().map_err(|typ| {
|
|
Box::new(EvalAltResult::ErrorMismatchOutputType(
|
|
"string".into(),
|
|
typ.into(),
|
|
Position::none(),
|
|
))
|
|
})?;
|
|
let _value = _value.serialize(&mut *self)?;
|
|
let map = self._value.downcast_mut::<Map>().unwrap();
|
|
map.insert(_key, _value);
|
|
Ok(())
|
|
}
|
|
#[cfg(feature = "no_object")]
|
|
unreachable!()
|
|
}
|
|
|
|
fn end(self) -> Result<Self::Ok, Box<EvalAltResult>> {
|
|
#[cfg(not(feature = "no_object"))]
|
|
return Ok(self._value);
|
|
#[cfg(feature = "no_object")]
|
|
unreachable!()
|
|
}
|
|
}
|
|
|
|
impl SerializeStruct for DynamicSerializer {
|
|
type Ok = Dynamic;
|
|
type Error = Box<EvalAltResult>;
|
|
|
|
fn serialize_field<T: ?Sized + Serialize>(
|
|
&mut self,
|
|
_key: &'static str,
|
|
_value: &T,
|
|
) -> Result<(), Box<EvalAltResult>> {
|
|
#[cfg(not(feature = "no_object"))]
|
|
{
|
|
let _value = _value.serialize(&mut *self)?;
|
|
let map = self._value.downcast_mut::<Map>().unwrap();
|
|
map.insert(_key.into(), _value);
|
|
Ok(())
|
|
}
|
|
#[cfg(feature = "no_object")]
|
|
unreachable!()
|
|
}
|
|
|
|
fn end(self) -> Result<Self::Ok, Box<EvalAltResult>> {
|
|
#[cfg(not(feature = "no_object"))]
|
|
return Ok(self._value);
|
|
#[cfg(feature = "no_object")]
|
|
unreachable!()
|
|
}
|
|
}
|
|
|
|
#[cfg(not(any(feature = "no_object", feature = "no_index")))]
|
|
pub struct TupleVariantSerializer {
|
|
variant: &'static str,
|
|
array: Array,
|
|
}
|
|
|
|
#[cfg(not(any(feature = "no_object", feature = "no_index")))]
|
|
impl SerializeTupleVariant for TupleVariantSerializer {
|
|
type Ok = Dynamic;
|
|
type Error = Box<EvalAltResult>;
|
|
|
|
fn serialize_field<T: ?Sized + Serialize>(
|
|
&mut self,
|
|
value: &T,
|
|
) -> Result<(), Box<EvalAltResult>> {
|
|
let value = to_dynamic(value)?;
|
|
self.array.push(value);
|
|
Ok(())
|
|
}
|
|
|
|
fn end(self) -> Result<Self::Ok, Box<EvalAltResult>> {
|
|
make_variant(self.variant, self.array.into())
|
|
}
|
|
}
|
|
|
|
#[cfg(not(feature = "no_object"))]
|
|
pub struct StructVariantSerializer {
|
|
variant: &'static str,
|
|
map: Map,
|
|
}
|
|
|
|
#[cfg(not(feature = "no_object"))]
|
|
impl SerializeStructVariant for StructVariantSerializer {
|
|
type Ok = Dynamic;
|
|
type Error = Box<EvalAltResult>;
|
|
|
|
fn serialize_field<T: ?Sized + Serialize>(
|
|
&mut self,
|
|
key: &'static str,
|
|
value: &T,
|
|
) -> Result<(), Box<EvalAltResult>> {
|
|
let value = to_dynamic(value)?;
|
|
self.map.insert(key.into(), value);
|
|
Ok(())
|
|
}
|
|
|
|
fn end(self) -> Result<Self::Ok, Box<EvalAltResult>> {
|
|
make_variant(self.variant, self.map.into())
|
|
}
|
|
}
|
|
|
|
#[cfg(not(feature = "no_object"))]
|
|
fn make_variant(variant: &'static str, value: Dynamic) -> Result<Dynamic, Box<EvalAltResult>> {
|
|
let mut map = Map::with_capacity(1);
|
|
map.insert(variant.into(), value);
|
|
Ok(map.into())
|
|
}
|