Add serde deserialization.

src/serde/str.rs

@@ -0,0 +1,152 @@
+use crate::result::EvalAltResult;
+use crate::token::Position;
+use crate::utils::ImmutableString;
+
+use serde::de::{Deserializer, Visitor};
+
+use crate::stdlib::any::type_name;
+
+pub struct ImmutableStringDeserializer<'a> {
+    value: &'a ImmutableString,
+}
+
+impl<'a> ImmutableStringDeserializer<'a> {
+    pub fn from_str(value: &'a ImmutableString) -> Self {
+        Self { value }
+    }
+    pub fn type_error<R, T>(&self) -> Result<T, Box<EvalAltResult>> {
+        self.type_error_str(type_name::<R>())
+    }
+    pub fn type_error_str<T>(&self, name: &str) -> Result<T, Box<EvalAltResult>> {
+        Err(Box::new(EvalAltResult::ErrorMismatchOutputType(
+            name.into(),
+            "string".into(),
+            Position::none(),
+        )))
+    }
+}
+
+impl<'de> Deserializer<'de> for &mut ImmutableStringDeserializer<'de> {
+    type Error = Box<EvalAltResult>;
+
+    fn deserialize_any<V: Visitor<'de>>(self, v: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.deserialize_str(v)
+    }
+    fn deserialize_bool<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<bool, _>()
+    }
+    fn deserialize_i8<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<i8, _>()
+    }
+    fn deserialize_i16<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<i16, _>()
+    }
+    fn deserialize_i32<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<i32, _>()
+    }
+    fn deserialize_i64<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<i64, _>()
+    }
+    fn deserialize_u8<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<u8, _>()
+    }
+    fn deserialize_u16<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<u16, _>()
+    }
+    fn deserialize_u32<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<u32, _>()
+    }
+    fn deserialize_u64<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<u64, _>()
+    }
+    fn deserialize_f32<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error_str("f32")
+    }
+    fn deserialize_f64<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error_str("f64")
+    }
+    fn deserialize_char<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<char, _>()
+    }
+    fn deserialize_str<V: Visitor<'de>>(self, v: V) -> Result<V::Value, Box<EvalAltResult>> {
+        v.visit_borrowed_str(self.value.as_str())
+    }
+    fn deserialize_string<V: Visitor<'de>>(
+        self,
+        visitor: V,
+    ) -> Result<V::Value, Box<EvalAltResult>> {
+        self.deserialize_str(visitor)
+    }
+    fn deserialize_bytes<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error_str("bytes array")
+    }
+    fn deserialize_byte_buf<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error_str("bytes array")
+    }
+    fn deserialize_option<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error_str("option")
+    }
+    fn deserialize_unit<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error::<(), _>()
+    }
+    fn deserialize_unit_struct<V: Visitor<'de>>(
+        self,
+        _name: &'static str,
+        v: V,
+    ) -> Result<V::Value, Box<EvalAltResult>> {
+        self.deserialize_unit(v)
+    }
+    fn deserialize_newtype_struct<V: Visitor<'de>>(
+        self,
+        _name: &'static str,
+        v: V,
+    ) -> Result<V::Value, Box<EvalAltResult>> {
+        v.visit_newtype_struct(self)
+    }
+    fn deserialize_seq<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error_str("array")
+    }
+    fn deserialize_tuple<V: Visitor<'de>>(
+        self,
+        _len: usize,
+        v: V,
+    ) -> Result<V::Value, Box<EvalAltResult>> {
+        self.deserialize_seq(v)
+    }
+    fn deserialize_tuple_struct<V: Visitor<'de>>(
+        self,
+        _name: &'static str,
+        _len: usize,
+        v: V,
+    ) -> Result<V::Value, Box<EvalAltResult>> {
+        self.deserialize_seq(v)
+    }
+    fn deserialize_map<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error_str("map")
+    }
+    fn deserialize_struct<V: Visitor<'de>>(
+        self,
+        _name: &'static str,
+        _fields: &'static [&'static str],
+        v: V,
+    ) -> Result<V::Value, Box<EvalAltResult>> {
+        self.deserialize_map(v)
+    }
+    fn deserialize_enum<V: Visitor<'de>>(
+        self,
+        _name: &'static str,
+        _variants: &'static [&'static str],
+        _: V,
+    ) -> Result<V::Value, Box<EvalAltResult>> {
+        self.type_error_str("enum")
+    }
+    fn deserialize_identifier<V: Visitor<'de>>(self, v: V) -> Result<V::Value, Box<EvalAltResult>> {
+        self.deserialize_str(v)
+    }
+    fn deserialize_ignored_any<V: Visitor<'de>>(
+        self,
+        v: V,
+    ) -> Result<V::Value, Box<EvalAltResult>> {
+        self.deserialize_any(v)
+    }
+}