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use crate::ParamType;
use serde::de::{Error, MapAccess, Visitor};
use serde::{Deserialize, Deserializer};
use std::fmt;
#[derive(Debug, Clone, PartialEq)]
pub struct TupleParam {
pub name: Option<String>,
pub kind: ParamType,
}
impl<'a> Deserialize<'a> for TupleParam {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'a>,
{
deserializer.deserialize_any(TupleParamVisitor)
}
}
struct TupleParamVisitor;
impl<'a> Visitor<'a> for TupleParamVisitor {
type Value = TupleParam;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(formatter, "a valid tuple parameter spec")
}
fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
where
A: MapAccess<'a>,
{
let mut name = None;
let mut kind = None;
let mut components = None;
while let Some(ref key) = map.next_key::<String>()? {
match key.as_ref() {
"name" => {
if name.is_some() {
return Err(Error::duplicate_field("name"));
}
name = Some(map.next_value()?);
}
"type" => {
if kind.is_some() {
return Err(Error::duplicate_field("type"));
}
kind = Some(map.next_value()?);
}
"components" => {
if components.is_some() {
return Err(Error::duplicate_field("components"));
}
let component: Vec<TupleParam> = map.next_value()?;
components = Some(component)
}
_ => {}
}
}
let kind = kind.ok_or_else(|| Error::missing_field("kind")).and_then(|param_type| match param_type {
ParamType::Tuple(_) => {
let tuple_params = components.ok_or_else(|| Error::missing_field("components"))?;
Ok(ParamType::Tuple(tuple_params.into_iter().map(|param| param.kind).map(Box::new).collect()))
}
ParamType::Array(inner_param_type) => match *inner_param_type {
ParamType::Tuple(_) => {
let tuple_params = components.ok_or_else(|| Error::missing_field("components"))?;
Ok(ParamType::Array(Box::new(ParamType::Tuple(
tuple_params.into_iter().map(|param| param.kind).map(Box::new).collect(),
))))
}
_ => Ok(ParamType::Array(inner_param_type)),
},
ParamType::FixedArray(inner_param_type, size) => match *inner_param_type {
ParamType::Tuple(_) => {
let tuple_params = components.ok_or_else(|| Error::missing_field("components"))?;
Ok(ParamType::FixedArray(
Box::new(ParamType::Tuple(
tuple_params.into_iter().map(|param| param.kind).map(Box::new).collect(),
)),
size,
))
}
_ => Ok(ParamType::FixedArray(inner_param_type, size)),
},
_ => Ok(param_type),
})?;
Ok(TupleParam { name, kind })
}
}
#[cfg(test)]
mod tests {
use crate::{ParamType, TupleParam};
use serde_json;
#[test]
fn tuple_param_deserialization() {
let s = r#"[{
"name": "foo",
"type": "address"
},{
"name": "bar",
"type": "address"
},{
"name": "baz",
"type": "address"
},{
"type": "bool"
}
]"#;
let deserialized: Vec<TupleParam> = serde_json::from_str(s).unwrap();
assert_eq!(
deserialized,
vec![
TupleParam { name: Some(String::from("foo")), kind: ParamType::Address },
TupleParam { name: Some(String::from("bar")), kind: ParamType::Address },
TupleParam { name: Some(String::from("baz")), kind: ParamType::Address },
TupleParam { name: None, kind: ParamType::Bool },
]
);
}
}