631 lines
20 KiB
Rust
631 lines
20 KiB
Rust
//! Implement deserialization support of [`Dynamic`][crate::Dynamic] for [`serde`].
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use super::str::StringSliceDeserializer;
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use crate::dynamic::Union;
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use crate::{Dynamic, EvalAltResult, ImmutableString, LexError, Position};
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use serde::de::{DeserializeSeed, Error, IntoDeserializer, MapAccess, SeqAccess, Visitor};
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use serde::{Deserialize, Deserializer};
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#[cfg(feature = "no_std")]
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use std::prelude::v1::*;
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use std::{any::type_name, fmt};
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#[cfg(not(feature = "no_index"))]
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use crate::Array;
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#[cfg(not(feature = "no_object"))]
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use crate::Map;
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/// Deserializer for [`Dynamic`][crate::Dynamic] which is kept as a reference.
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///
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/// The reference is necessary because the deserialized type may hold references
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/// (especially `&str`) to the source [`Dynamic`][crate::Dynamic].
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struct DynamicDeserializer<'a> {
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value: &'a Dynamic,
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}
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impl<'de> DynamicDeserializer<'de> {
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/// Create a [`DynamicDeserializer`] from a reference to a [`Dynamic`][crate::Dynamic] value.
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///
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/// The reference is necessary because the deserialized type may hold references
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/// (especially `&str`) to the source [`Dynamic`][crate::Dynamic].
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#[must_use]
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pub fn from_dynamic(value: &'de Dynamic) -> Self {
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Self { value }
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}
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/// Shortcut for a type conversion error.
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#[must_use]
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fn type_error<T>(&self) -> Result<T, Box<EvalAltResult>> {
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self.type_error_str(type_name::<T>())
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}
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/// Shortcut for a type conversion error.
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#[must_use]
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fn type_error_str<T>(&self, error: &str) -> Result<T, Box<EvalAltResult>> {
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EvalAltResult::ErrorMismatchOutputType(
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error.into(),
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self.value.type_name().into(),
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Position::NONE,
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)
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.into()
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}
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#[must_use]
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fn deserialize_int<V: Visitor<'de>>(
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&mut self,
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v: crate::INT,
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visitor: V,
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) -> Result<V::Value, Box<EvalAltResult>> {
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#[cfg(not(feature = "only_i32"))]
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return visitor.visit_i64(v);
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#[cfg(feature = "only_i32")]
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return visitor.visit_i32(v);
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}
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}
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/// Deserialize a [`Dynamic`][crate::Dynamic] value into a Rust type that implements [`serde::Deserialize`].
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///
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/// # Example
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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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/// # {
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/// use rhai::{Dynamic, Array, Map, INT};
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/// use rhai::serde::from_dynamic;
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/// use serde::Deserialize;
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///
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/// #[derive(Debug, Deserialize, PartialEq)]
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/// struct Hello {
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/// a: INT,
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/// b: bool,
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/// }
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///
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/// #[derive(Debug, Deserialize, PartialEq)]
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/// struct Test {
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/// int: u32,
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/// seq: Vec<String>,
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/// obj: Hello,
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/// }
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///
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/// let mut map = Map::new();
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/// map.insert("int".into(), Dynamic::from(42_u32));
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///
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/// let mut map2 = Map::new();
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/// map2.insert("a".into(), (123 as INT).into());
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/// map2.insert("b".into(), true.into());
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///
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/// map.insert("obj".into(), map2.into());
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///
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/// let arr: Array = vec!["foo".into(), "bar".into(), "baz".into()];
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/// map.insert("seq".into(), arr.into());
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///
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/// let value: Test = from_dynamic(&map.into())?;
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///
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/// let expected = Test {
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/// int: 42,
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/// seq: vec!["foo".into(), "bar".into(), "baz".into()],
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/// obj: Hello { a: 123, b: true },
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/// };
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///
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/// assert_eq!(value, expected);
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/// # }
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/// # Ok(())
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/// # }
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/// ```
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#[must_use]
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pub fn from_dynamic<'de, T: Deserialize<'de>>(
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value: &'de Dynamic,
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) -> Result<T, Box<EvalAltResult>> {
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T::deserialize(&mut DynamicDeserializer::from_dynamic(value))
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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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LexError::ImproperSymbol(Default::default(), err.to_string())
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.into_err(Position::NONE)
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.into()
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}
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}
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impl<'de> Deserializer<'de> for &mut DynamicDeserializer<'de> {
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type Error = Box<EvalAltResult>;
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fn deserialize_any<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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match &self.value.0 {
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Union::Unit(_, _, _) => self.deserialize_unit(visitor),
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Union::Bool(_, _, _) => self.deserialize_bool(visitor),
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Union::Str(_, _, _) => self.deserialize_str(visitor),
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Union::Char(_, _, _) => self.deserialize_char(visitor),
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#[cfg(not(feature = "only_i32"))]
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Union::Int(_, _, _) => self.deserialize_i64(visitor),
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#[cfg(feature = "only_i32")]
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Union::Int(_, _, _) => self.deserialize_i32(visitor),
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#[cfg(not(feature = "no_float"))]
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#[cfg(not(feature = "f32_float"))]
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Union::Float(_, _, _) => self.deserialize_f64(visitor),
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#[cfg(not(feature = "no_float"))]
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#[cfg(feature = "f32_float")]
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Union::Float(_, _, _) => self.deserialize_f32(visitor),
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#[cfg(feature = "decimal")]
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#[cfg(not(feature = "f32_float"))]
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Union::Decimal(_, _, _) => self.deserialize_f64(visitor),
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#[cfg(feature = "decimal")]
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#[cfg(feature = "f32_float")]
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Union::Decimal(_, _, _) => self.deserialize_f32(visitor),
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#[cfg(not(feature = "no_index"))]
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Union::Array(_, _, _) => self.deserialize_seq(visitor),
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#[cfg(not(feature = "no_object"))]
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Union::Map(_, _, _) => self.deserialize_map(visitor),
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Union::FnPtr(_, _, _) => self.type_error(),
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#[cfg(not(feature = "no_std"))]
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Union::TimeStamp(_, _, _) => self.type_error(),
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Union::Variant(value, _, _) if value.is::<i8>() => self.deserialize_i8(visitor),
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Union::Variant(value, _, _) if value.is::<i16>() => self.deserialize_i16(visitor),
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Union::Variant(value, _, _) if value.is::<i32>() => self.deserialize_i32(visitor),
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Union::Variant(value, _, _) if value.is::<i64>() => self.deserialize_i64(visitor),
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Union::Variant(value, _, _) if value.is::<i128>() => self.deserialize_i128(visitor),
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Union::Variant(value, _, _) if value.is::<u8>() => self.deserialize_u8(visitor),
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Union::Variant(value, _, _) if value.is::<u16>() => self.deserialize_u16(visitor),
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Union::Variant(value, _, _) if value.is::<u32>() => self.deserialize_u32(visitor),
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Union::Variant(value, _, _) if value.is::<u64>() => self.deserialize_u64(visitor),
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Union::Variant(value, _, _) if value.is::<u128>() => self.deserialize_u128(visitor),
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Union::Variant(_, _, _) => self.type_error(),
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#[cfg(not(feature = "no_closure"))]
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Union::Shared(_, _, _) => self.type_error(),
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}
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}
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fn deserialize_bool<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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visitor.visit_bool(self.value.as_bool().or_else(|_| self.type_error())?)
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}
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fn deserialize_i8<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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if let Ok(v) = self.value.as_int() {
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self.deserialize_int(v, visitor)
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} else {
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self.value
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.downcast_ref::<i8>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_i8(x))
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}
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}
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fn deserialize_i16<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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if let Ok(v) = self.value.as_int() {
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self.deserialize_int(v, visitor)
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} else {
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self.value
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.downcast_ref::<i16>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_i16(x))
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}
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}
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fn deserialize_i32<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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if let Ok(v) = self.value.as_int() {
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self.deserialize_int(v, visitor)
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} else if cfg!(feature = "only_i32") {
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self.type_error()
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} else {
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self.value
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.downcast_ref::<i32>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_i32(x))
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}
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}
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fn deserialize_i64<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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if let Ok(v) = self.value.as_int() {
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self.deserialize_int(v, visitor)
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} else if cfg!(not(feature = "only_i32")) {
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self.type_error()
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} else {
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self.value
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.downcast_ref::<i64>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_i64(x))
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}
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}
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fn deserialize_i128<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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if let Ok(v) = self.value.as_int() {
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self.deserialize_int(v, visitor)
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} else if cfg!(not(feature = "only_i32")) {
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self.type_error()
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} else {
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self.value
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.downcast_ref::<i128>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_i128(x))
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}
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}
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fn deserialize_u8<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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if let Ok(v) = self.value.as_int() {
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self.deserialize_int(v, visitor)
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} else {
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self.value
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.downcast_ref::<u8>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_u8(x))
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}
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}
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fn deserialize_u16<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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if let Ok(v) = self.value.as_int() {
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self.deserialize_int(v, visitor)
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} else {
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self.value
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.downcast_ref::<u16>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_u16(x))
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}
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}
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fn deserialize_u32<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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if let Ok(v) = self.value.as_int() {
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self.deserialize_int(v, visitor)
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} else {
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self.value
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.downcast_ref::<u32>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_u32(x))
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}
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}
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fn deserialize_u64<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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if let Ok(v) = self.value.as_int() {
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self.deserialize_int(v, visitor)
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} else {
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self.value
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.downcast_ref::<u64>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_u64(x))
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}
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}
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fn deserialize_u128<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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if let Ok(v) = self.value.as_int() {
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self.deserialize_int(v, visitor)
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} else {
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self.value
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.downcast_ref::<u128>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_u128(x))
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}
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}
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fn deserialize_f32<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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#[cfg(not(feature = "no_float"))]
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return self
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.value
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.downcast_ref::<f32>()
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.map_or_else(|| self.type_error(), |&x| _visitor.visit_f32(x));
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#[cfg(feature = "no_float")]
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#[cfg(feature = "decimal")]
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{
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use rust_decimal::prelude::ToPrimitive;
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return self
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.value
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.downcast_ref::<rust_decimal::Decimal>()
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.and_then(|&x| x.to_f32())
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.map_or_else(|| self.type_error(), |v| _visitor.visit_f32(v));
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}
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#[cfg(feature = "no_float")]
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#[cfg(not(feature = "decimal"))]
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return self.type_error_str("f32");
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}
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fn deserialize_f64<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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#[cfg(not(feature = "no_float"))]
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return self
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.value
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.downcast_ref::<f64>()
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.map_or_else(|| self.type_error(), |&x| _visitor.visit_f64(x));
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#[cfg(feature = "no_float")]
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#[cfg(feature = "decimal")]
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{
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use rust_decimal::prelude::ToPrimitive;
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return self
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.value
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.downcast_ref::<rust_decimal::Decimal>()
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.and_then(|&x| x.to_f64())
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.map_or_else(|| self.type_error(), |v| _visitor.visit_f64(v));
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}
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#[cfg(feature = "no_float")]
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#[cfg(not(feature = "decimal"))]
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return self.type_error_str("f64");
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}
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fn deserialize_char<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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self.value
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.downcast_ref::<char>()
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.map_or_else(|| self.type_error(), |&x| visitor.visit_char(x))
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}
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fn deserialize_str<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
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self.value.downcast_ref::<ImmutableString>().map_or_else(
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|| self.type_error(),
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|x| visitor.visit_borrowed_str(x.as_str()),
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)
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}
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fn deserialize_string<V: Visitor<'de>>(
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self,
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visitor: V,
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) -> Result<V::Value, Box<EvalAltResult>> {
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self.deserialize_str(visitor)
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}
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fn deserialize_bytes<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
|
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self.type_error()
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}
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|
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fn deserialize_byte_buf<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
|
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self.type_error()
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}
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|
|
|
fn deserialize_option<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
|
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self.type_error()
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}
|
|
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|
fn deserialize_unit<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
|
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self.value
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.downcast_ref::<()>()
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.map_or_else(|| self.type_error(), |_| visitor.visit_unit())
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}
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|
|
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fn deserialize_unit_struct<V: Visitor<'de>>(
|
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self,
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_name: &'static str,
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visitor: V,
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) -> Result<V::Value, Box<EvalAltResult>> {
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self.deserialize_unit(visitor)
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|
}
|
|
|
|
fn deserialize_newtype_struct<V: Visitor<'de>>(
|
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self,
|
|
_name: &'static str,
|
|
visitor: V,
|
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) -> Result<V::Value, Box<EvalAltResult>> {
|
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visitor.visit_newtype_struct(self)
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|
}
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|
|
|
fn deserialize_seq<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
|
|
#[cfg(not(feature = "no_index"))]
|
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return self.value.downcast_ref::<Array>().map_or_else(
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|| self.type_error(),
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|arr| _visitor.visit_seq(IterateArray::new(arr.iter())),
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);
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|
|
|
#[cfg(feature = "no_index")]
|
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return self.type_error();
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|
}
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|
|
|
fn deserialize_tuple<V: Visitor<'de>>(
|
|
self,
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_len: usize,
|
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visitor: V,
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|
) -> Result<V::Value, Box<EvalAltResult>> {
|
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self.deserialize_seq(visitor)
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|
}
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|
|
fn deserialize_tuple_struct<V: Visitor<'de>>(
|
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self,
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_name: &'static str,
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_len: usize,
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visitor: V,
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) -> Result<V::Value, Box<EvalAltResult>> {
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self.deserialize_seq(visitor)
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}
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fn deserialize_map<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value, Box<EvalAltResult>> {
|
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#[cfg(not(feature = "no_object"))]
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return self.value.downcast_ref::<Map>().map_or_else(
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|| self.type_error(),
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|map| {
|
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_visitor.visit_map(IterateMap::new(
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map.keys().map(|key| key.as_str()),
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map.values(),
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))
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},
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);
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|
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#[cfg(feature = "no_object")]
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return self.type_error();
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}
|
|
|
|
fn deserialize_struct<V: Visitor<'de>>(
|
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self,
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_name: &'static str,
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_fields: &'static [&'static str],
|
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visitor: V,
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) -> Result<V::Value, Box<EvalAltResult>> {
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self.deserialize_map(visitor)
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}
|
|
|
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fn deserialize_enum<V: Visitor<'de>>(
|
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self,
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_name: &'static str,
|
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_variants: &'static [&'static str],
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visitor: V,
|
|
) -> Result<V::Value, Box<EvalAltResult>> {
|
|
if let Some(s) = self.value.read_lock::<ImmutableString>() {
|
|
visitor.visit_enum(s.as_str().into_deserializer())
|
|
} else {
|
|
#[cfg(not(feature = "no_object"))]
|
|
if let Some(map) = self.value.downcast_ref::<Map>() {
|
|
let mut iter = map.iter();
|
|
let first = iter.next();
|
|
let second = iter.next();
|
|
if let (Some((key, value)), None) = (first, second) {
|
|
visitor.visit_enum(EnumDeserializer {
|
|
tag: &key,
|
|
content: DynamicDeserializer::from_dynamic(value),
|
|
})
|
|
} else {
|
|
self.type_error()
|
|
}
|
|
} else {
|
|
self.type_error()
|
|
}
|
|
#[cfg(feature = "no_object")]
|
|
return self.type_error();
|
|
}
|
|
}
|
|
|
|
fn deserialize_identifier<V: Visitor<'de>>(
|
|
self,
|
|
visitor: V,
|
|
) -> Result<V::Value, Box<EvalAltResult>> {
|
|
self.deserialize_str(visitor)
|
|
}
|
|
|
|
fn deserialize_ignored_any<V: Visitor<'de>>(
|
|
self,
|
|
visitor: V,
|
|
) -> Result<V::Value, Box<EvalAltResult>> {
|
|
self.deserialize_any(visitor)
|
|
}
|
|
}
|
|
|
|
/// `SeqAccess` implementation for arrays.
|
|
struct IterateArray<'a, ITER: Iterator<Item = &'a Dynamic>> {
|
|
/// Iterator for a stream of [`Dynamic`][crate::Dynamic] values.
|
|
iter: ITER,
|
|
}
|
|
|
|
#[cfg(not(feature = "no_index"))]
|
|
impl<'a, ITER: Iterator<Item = &'a Dynamic>> IterateArray<'a, ITER> {
|
|
#[must_use]
|
|
pub fn new(iter: ITER) -> Self {
|
|
Self { iter }
|
|
}
|
|
}
|
|
|
|
impl<'a: 'de, 'de, ITER: Iterator<Item = &'a Dynamic>> SeqAccess<'de> for IterateArray<'a, ITER> {
|
|
type Error = Box<EvalAltResult>;
|
|
|
|
fn next_element_seed<T: DeserializeSeed<'de>>(
|
|
&mut self,
|
|
seed: T,
|
|
) -> Result<Option<T::Value>, Box<EvalAltResult>> {
|
|
// Deserialize each item coming out of the iterator.
|
|
match self.iter.next() {
|
|
None => Ok(None),
|
|
Some(item) => seed
|
|
.deserialize(&mut DynamicDeserializer::from_dynamic(item))
|
|
.map(Some),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// `MapAccess` implementation for maps.
|
|
struct IterateMap<'a, KEYS, VALUES>
|
|
where
|
|
KEYS: Iterator<Item = &'a str>,
|
|
VALUES: Iterator<Item = &'a Dynamic>,
|
|
{
|
|
// Iterator for a stream of [`Dynamic`][crate::Dynamic] keys.
|
|
keys: KEYS,
|
|
// Iterator for a stream of [`Dynamic`][crate::Dynamic] values.
|
|
values: VALUES,
|
|
}
|
|
|
|
#[cfg(not(feature = "no_object"))]
|
|
impl<'a, KEYS, VALUES> IterateMap<'a, KEYS, VALUES>
|
|
where
|
|
KEYS: Iterator<Item = &'a str>,
|
|
VALUES: Iterator<Item = &'a Dynamic>,
|
|
{
|
|
#[must_use]
|
|
pub fn new(keys: KEYS, values: VALUES) -> Self {
|
|
Self { keys, values }
|
|
}
|
|
}
|
|
|
|
impl<'a: 'de, 'de, KEYS, VALUES> MapAccess<'de> for IterateMap<'a, KEYS, VALUES>
|
|
where
|
|
KEYS: Iterator<Item = &'a str>,
|
|
VALUES: Iterator<Item = &'a Dynamic>,
|
|
{
|
|
type Error = Box<EvalAltResult>;
|
|
|
|
fn next_key_seed<K: DeserializeSeed<'de>>(
|
|
&mut self,
|
|
seed: K,
|
|
) -> Result<Option<K::Value>, Box<EvalAltResult>> {
|
|
// Deserialize each `Identifier` key coming out of the keys iterator.
|
|
match self.keys.next() {
|
|
None => Ok(None),
|
|
Some(item) => seed
|
|
.deserialize(&mut StringSliceDeserializer::from_str(item))
|
|
.map(Some),
|
|
}
|
|
}
|
|
|
|
fn next_value_seed<V: DeserializeSeed<'de>>(
|
|
&mut self,
|
|
seed: V,
|
|
) -> Result<V::Value, Box<EvalAltResult>> {
|
|
// Deserialize each value item coming out of the iterator.
|
|
seed.deserialize(&mut DynamicDeserializer::from_dynamic(
|
|
self.values.next().unwrap(),
|
|
))
|
|
}
|
|
}
|
|
|
|
#[cfg(not(feature = "no_object"))]
|
|
struct EnumDeserializer<'t, 'de: 't> {
|
|
tag: &'t str,
|
|
content: DynamicDeserializer<'de>,
|
|
}
|
|
|
|
#[cfg(not(feature = "no_object"))]
|
|
impl<'t, 'de> serde::de::EnumAccess<'de> for EnumDeserializer<'t, 'de> {
|
|
type Error = Box<EvalAltResult>;
|
|
type Variant = Self;
|
|
|
|
fn variant_seed<V: DeserializeSeed<'de>>(
|
|
self,
|
|
seed: V,
|
|
) -> Result<(V::Value, Self::Variant), Self::Error> {
|
|
seed.deserialize(self.tag.into_deserializer())
|
|
.map(|v| (v, self))
|
|
}
|
|
}
|
|
|
|
#[cfg(not(feature = "no_object"))]
|
|
impl<'t, 'de> serde::de::VariantAccess<'de> for EnumDeserializer<'t, 'de> {
|
|
type Error = Box<EvalAltResult>;
|
|
|
|
fn unit_variant(mut self) -> Result<(), Self::Error> {
|
|
Deserialize::deserialize(&mut self.content)
|
|
}
|
|
|
|
fn newtype_variant_seed<T: DeserializeSeed<'de>>(
|
|
mut self,
|
|
seed: T,
|
|
) -> Result<T::Value, Self::Error> {
|
|
seed.deserialize(&mut self.content)
|
|
}
|
|
|
|
fn tuple_variant<V: Visitor<'de>>(
|
|
mut self,
|
|
len: usize,
|
|
visitor: V,
|
|
) -> Result<V::Value, Self::Error> {
|
|
self.content.deserialize_tuple(len, visitor)
|
|
}
|
|
|
|
fn struct_variant<V: Visitor<'de>>(
|
|
mut self,
|
|
fields: &'static [&'static str],
|
|
visitor: V,
|
|
) -> Result<V::Value, Self::Error> {
|
|
self.content.deserialize_struct("", fields, visitor)
|
|
}
|
|
}
|