use std::borrow::Cow;
use serde::{
Serialize,
ser::{self, Error as _},
};
use crate::queries::{Argument, InputLiteral};
pub fn to_input_literal<T>(value: &T) -> Result<InputLiteral, Error>
where
T: Serialize + ?Sized,
{
value.serialize(InputLiteralSerializer)
}
struct InputLiteralSerializer;
impl ser::Serializer for InputLiteralSerializer {
type Ok = InputLiteral;
type Error = Error;
type SerializeSeq = ListSerializer;
type SerializeTuple = ListSerializer;
type SerializeTupleStruct = ser::Impossible<InputLiteral, Error>;
type SerializeTupleVariant = ser::Impossible<InputLiteral, Error>;
type SerializeMap = MapSerializer;
type SerializeStruct = MapSerializer;
type SerializeStructVariant = ser::Impossible<InputLiteral, Error>;
fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Bool(v))
}
fn serialize_i8(self, v: i8) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Int(v as i32))
}
fn serialize_i16(self, v: i16) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Int(v as i32))
}
fn serialize_i32(self, v: i32) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Int(v))
}
fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Int(i32::try_from(v).map_err(|e| {
Error::custom(format!("graphql integers must fit into an i32: {e}"))
})?))
}
fn serialize_u8(self, v: u8) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Int(v as i32))
}
fn serialize_u16(self, v: u16) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Int(v as i32))
}
fn serialize_u32(self, v: u32) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Int(i32::try_from(v).map_err(|e| {
Error::custom(format!("graphql integers must fit into an i32: {e}"))
})?))
}
fn serialize_u64(self, v: u64) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Int(i32::try_from(v).map_err(|e| {
Error::custom(format!("graphql integers must fit into an i32: {e}"))
})?))
}
fn serialize_f32(self, v: f32) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Float(v as f64))
}
fn serialize_f64(self, v: f64) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Float(v))
}
fn serialize_char(self, v: char) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::String(v.to_string().into()))
}
fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::String(v.to_string().into()))
}
fn serialize_bytes(self, _v: &[u8]) -> Result<Self::Ok, Self::Error> {
Err(Error::custom("cannot serialize bytes as an InputLiteral"))
}
fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Null)
}
fn serialize_some<T>(self, value: &T) -> Result<Self::Ok, Self::Error>
where
T: Serialize + ?Sized,
{
value.serialize(self)
}
fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
Err(Error::custom("cannot serialize unit as an InputLiteral"))
}
fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"cannot serialize a unit struct as an InputLiteral",
))
}
fn serialize_unit_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::EnumValue(variant))
}
fn serialize_newtype_struct<T>(
self,
_name: &'static str,
value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: Serialize + ?Sized,
{
value.serialize(self)
}
fn serialize_newtype_variant<T>(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: Serialize + ?Sized,
{
Err(Error::custom(
"cannot serialize a newtype variant as an InputLiteral",
))
}
fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
let items = match len {
Some(len) => Vec::with_capacity(len),
None => Vec::new(),
};
Ok(ListSerializer { items })
}
fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, Self::Error> {
self.serialize_seq(Some(len))
}
fn serialize_tuple_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleStruct, Self::Error> {
Err(Error::custom(
"cannot serialize a tuple struct as an InputLiteral",
))
}
fn serialize_tuple_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleVariant, Self::Error> {
Err(Error::custom(
"cannot serialize a tuple variant as an InputLiteral",
))
}
fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
let entries = match len {
Some(len) => Vec::with_capacity(len),
None => Vec::new(),
};
Ok(MapSerializer {
entries,
next_key: None,
})
}
fn serialize_struct(
self,
_name: &'static str,
len: usize,
) -> Result<Self::SerializeStruct, Self::Error> {
self.serialize_map(Some(len))
}
fn serialize_struct_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeStructVariant, Self::Error> {
Err(Error::custom(
"cannot serialize a struct variant as an InputLiteral",
))
}
}
struct ListSerializer {
items: Vec<InputLiteral>,
}
impl ser::SerializeSeq for ListSerializer {
type Ok = InputLiteral;
type Error = Error;
fn serialize_element<T>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: Serialize + ?Sized,
{
self.items.push(value.serialize(InputLiteralSerializer)?);
Ok(())
}
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::List(self.items))
}
}
impl ser::SerializeTuple for ListSerializer {
type Ok = InputLiteral;
type Error = Error;
fn serialize_element<T>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: Serialize + ?Sized,
{
self.items.push(to_input_literal(value)?);
Ok(())
}
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::List(self.items))
}
}
struct MapSerializer {
entries: Vec<Argument>,
next_key: Option<Cow<'static, str>>,
}
impl ser::SerializeMap for MapSerializer {
type Ok = InputLiteral;
type Error = Error;
fn serialize_key<T>(&mut self, key: &T) -> Result<(), Self::Error>
where
T: Serialize + ?Sized,
{
self.next_key = Some(key.serialize(KeySerializer)?);
Ok(())
}
fn serialize_value<T>(&mut self, value: &T) -> Result<(), Self::Error>
where
T: Serialize + ?Sized,
{
self.entries.push(Argument::from_cow_name(
self.next_key.take().unwrap(),
to_input_literal(value)?,
));
Ok(())
}
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Object(self.entries))
}
}
impl ser::SerializeStruct for MapSerializer {
type Ok = InputLiteral;
type Error = Error;
fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<(), Self::Error>
where
T: Serialize + ?Sized,
{
self.entries
.push(Argument::new(key, to_input_literal(value)?));
Ok(())
}
fn end(self) -> Result<Self::Ok, Self::Error> {
Ok(InputLiteral::Object(self.entries))
}
}
struct KeySerializer;
impl ser::Serializer for KeySerializer {
type Ok = Cow<'static, str>;
type Error = Error;
type SerializeSeq = ser::Impossible<Cow<'static, str>, Error>;
type SerializeTuple = ser::Impossible<Cow<'static, str>, Error>;
type SerializeTupleStruct = ser::Impossible<Cow<'static, str>, Error>;
type SerializeTupleVariant = ser::Impossible<Cow<'static, str>, Error>;
type SerializeMap = ser::Impossible<Cow<'static, str>, Error>;
type SerializeStruct = ser::Impossible<Cow<'static, str>, Error>;
type SerializeStructVariant = ser::Impossible<Cow<'static, str>, Error>;
fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error> {
Ok(v.to_string().into())
}
fn serialize_i8(self, _v: i8) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings, found an int",
))
}
fn serialize_i16(self, _v: i16) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found an int",
))
}
fn serialize_i32(self, _v: i32) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found an int",
))
}
fn serialize_i64(self, _v: i64) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found an int",
))
}
fn serialize_u8(self, _v: u8) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found an int",
))
}
fn serialize_u16(self, _v: u16) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found an int",
))
}
fn serialize_u32(self, _v: u32) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found an int",
))
}
fn serialize_u64(self, _v: u64) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found an int",
))
}
fn serialize_f32(self, _v: f32) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found a float",
))
}
fn serialize_f64(self, _v: f64) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found a float",
))
}
fn serialize_char(self, v: char) -> Result<Self::Ok, Self::Error> {
Ok(v.to_string().into())
}
fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
Ok(v.to_string().into())
}
fn serialize_bytes(self, _v: &[u8]) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found some bytes",
))
}
fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found null",
))
}
fn serialize_some<T>(self, value: &T) -> Result<Self::Ok, Self::Error>
where
T: Serialize + ?Sized,
{
value.serialize(self)
}
fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found null",
))
}
fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found a struct",
))
}
fn serialize_unit_variant(
self,
_name: &'static str,
_variant_index: u32,
variant: &'static str,
) -> Result<Self::Ok, Self::Error> {
Ok(Cow::Borrowed(variant))
}
fn serialize_newtype_struct<T>(
self,
_name: &'static str,
_value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: Serialize + ?Sized,
{
Err(Error::custom(
"Map keys must be serializable as strings found a struct",
))
}
fn serialize_newtype_variant<T>(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_value: &T,
) -> Result<Self::Ok, Self::Error>
where
T: Serialize + ?Sized,
{
Err(Error::custom(
"Map keys must be serializable as strings found a newtype variant",
))
}
fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found a sequence",
))
}
fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found a sequence",
))
}
fn serialize_tuple_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleStruct, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found a tuple",
))
}
fn serialize_tuple_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeTupleVariant, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found a tuple",
))
}
fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found a map",
))
}
fn serialize_struct(
self,
_name: &'static str,
_len: usize,
) -> Result<Self::SerializeStruct, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found a struct",
))
}
fn serialize_struct_variant(
self,
_name: &'static str,
_variant_index: u32,
_variant: &'static str,
_len: usize,
) -> Result<Self::SerializeStructVariant, Self::Error> {
Err(Error::custom(
"Map keys must be serializable as strings found a struct",
))
}
}
#[derive(thiserror::Error, Debug)]
#[error("could not serialize to InputLiteral: {0}")]
pub struct Error(String);
impl serde::ser::Error for Error {
fn custom<T>(msg: T) -> Self
where
T: std::fmt::Display,
{
Error(msg.to_string())
}
}
#[cfg(test)]
mod tests {
use rstest::rstest;
use super::*;
#[rstest]
#[case(16, InputLiteral::Int(16))]
#[case(1.5, InputLiteral::Float(1.5))]
#[case(true, InputLiteral::Bool(true))]
#[case("hello".to_string(), InputLiteral::String("hello".to_string().into()))]
#[case(
maplit::btreemap! {
"bar" => 20,
"foo" => 16
},
InputLiteral::Object(vec![
Argument::new("bar", InputLiteral::Int(20)),
Argument::new("foo", InputLiteral::Int(16))
])
)]
#[case(
(1, 2, 3),
InputLiteral::List(vec![
InputLiteral::Int(1),
InputLiteral::Int(2),
InputLiteral::Int(3)
])
)]
#[case(
vec![1, 2, 3],
InputLiteral::List(vec![
InputLiteral::Int(1),
InputLiteral::Int(2),
InputLiteral::Int(3)
])
)]
fn test_serialization(#[case] input: impl serde::Serialize, #[case] expected: InputLiteral) {
assert_eq!(to_input_literal(&input).unwrap(), expected)
}
}