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Add docs on serde feature.

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This commit is contained in:
Stephen Chung
2020-07-04 15:39:40 +08:00
parent cf2461651c
commit b3b3a083b8
8 changed files with 303 additions and 171 deletions
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51
src/serde/str.rs
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@@ -1,3 +1,5 @@
//! Implement deserialization support of `ImmutableString` for [`serde`](https://crates.io/crates/serde).
use crate::result::EvalAltResult;
use crate::token::Position;
use crate::utils::ImmutableString;
@@ -6,20 +8,20 @@ use serde::de::{Deserializer, Visitor};
use crate::stdlib::any::type_name;
/// Deserializer for `ImmutableString`.
pub struct ImmutableStringDeserializer<'a> {
value: &'a ImmutableString,
}
impl<'a> ImmutableStringDeserializer<'a> {
/// Create an `ImmutableStringDeserializer` from an `ImmutableString` reference.
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>> {
/// Shortcut for a type conversion error.
fn type_error<T>(&self) -> Result<T, Box<EvalAltResult>> {
Err(Box::new(EvalAltResult::ErrorMismatchOutputType(
name.into(),
type_name::<T>().into(),
"string".into(),
Position::none(),
)))
@@ -33,42 +35,43 @@ impl<'de> Deserializer<'de> for &mut ImmutableStringDeserializer<'de> {
self.deserialize_str(v)
}
fn deserialize_bool<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<bool, _>()
self.type_error()
}
fn deserialize_i8<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<i8, _>()
self.type_error()
}
fn deserialize_i16<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<i16, _>()
self.type_error()
}
fn deserialize_i32<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<i32, _>()
self.type_error()
}
fn deserialize_i64<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<i64, _>()
self.type_error()
}
fn deserialize_u8<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<u8, _>()
self.type_error()
}
fn deserialize_u16<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<u16, _>()
self.type_error()
}
fn deserialize_u32<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<u32, _>()
self.type_error()
}
fn deserialize_u64<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<u64, _>()
self.type_error()
}
fn deserialize_f32<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error_str("f32")
self.type_error()
}
fn deserialize_f64<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error_str("f64")
self.type_error()
}
fn deserialize_char<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<char, _>()
self.type_error()
}
fn deserialize_str<V: Visitor<'de>>(self, v: V) -> Result<V::Value, Box<EvalAltResult>> {
// Only allow deserialization into a string.
v.visit_borrowed_str(self.value.as_str())
}
fn deserialize_string<V: Visitor<'de>>(
@@ -78,16 +81,16 @@ impl<'de> Deserializer<'de> for &mut ImmutableStringDeserializer<'de> {
self.deserialize_str(visitor)
}
fn deserialize_bytes<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error_str("bytes array")
self.type_error()
}
fn deserialize_byte_buf<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error_str("bytes array")
self.type_error()
}
fn deserialize_option<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error_str("option")
self.type_error()
}
fn deserialize_unit<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error::<(), _>()
self.type_error()
}
fn deserialize_unit_struct<V: Visitor<'de>>(
self,
@@ -104,7 +107,7 @@ impl<'de> Deserializer<'de> for &mut ImmutableStringDeserializer<'de> {
v.visit_newtype_struct(self)
}
fn deserialize_seq<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error_str("array")
self.type_error()
}
fn deserialize_tuple<V: Visitor<'de>>(
self,
@@ -122,7 +125,7 @@ impl<'de> Deserializer<'de> for &mut ImmutableStringDeserializer<'de> {
self.deserialize_seq(v)
}
fn deserialize_map<V: Visitor<'de>>(self, _: V) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error_str("map")
self.type_error()
}
fn deserialize_struct<V: Visitor<'de>>(
self,
@@ -138,7 +141,7 @@ impl<'de> Deserializer<'de> for &mut ImmutableStringDeserializer<'de> {
_variants: &'static [&'static str],
_: V,
) -> Result<V::Value, Box<EvalAltResult>> {
self.type_error_str("enum")
self.type_error()
}
fn deserialize_identifier<V: Visitor<'de>>(self, v: V) -> Result<V::Value, Box<EvalAltResult>> {
self.deserialize_str(v)