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use alloc::{
borrow::ToOwned,
format,
string::{String, ToString},
vec,
vec::Vec,
};
use serde_bytes;
use serde_derive::Deserialize;
use crate::{
error::{Error, Position, Span, SpannedError, SpannedResult},
parse::Parser,
value::Number,
#[cfg(feature = "internal-span-substring-test")]
use crate::util::span_substring::check_error_span_inclusive;
use crate::util::span_substring::check_error_span_exclusive;
#[derive(Debug, PartialEq, Deserialize)]
struct EmptyStruct1;
struct EmptyStruct2 {}
#[derive(Clone, Debug, PartialEq, Deserialize)]
struct NewType(i32);
#[derive(Clone, Copy, Debug, PartialEq, Deserialize)]
#[serde(rename = "")]
struct UnnamedNewType(i32);
struct TupleStruct(f32, f32);
struct UnnamedTupleStruct(f32, f32);
struct MyStruct {
x: f32,
y: f32,
}
enum MyEnum {
A,
B(bool),
C(bool, f32),
D { a: i32, b: i32 },
#[derive(Debug, Deserialize, PartialEq)]
struct BytesStruct {
small: Vec<u8>,
#[serde(with = "serde_bytes")]
large: Vec<u8>,
#[test]
fn test_empty_struct() {
check_from_str_bytes_reader("EmptyStruct1", Ok(EmptyStruct1));
check_from_str_bytes_reader("EmptyStruct2()", Ok(EmptyStruct2 {}));
fn test_struct() {
let my_struct = MyStruct { x: 4.0, y: 7.0 };
check_from_str_bytes_reader("MyStruct(x:4,y:7,)", Ok(my_struct));
check_from_str_bytes_reader("(x:4,y:7)", Ok(my_struct));
check_from_str_bytes_reader("NewType(42)", Ok(NewType(42)));
check_from_str_bytes_reader("(33)", Ok(NewType(33)));
let bogus_struct = "NewType";
let expected_err = Err(SpannedError {
code: Error::ExpectedNamedStructLike("NewType"),
span: Span {
start: Position { line: 1, col: 1 },
end: Position { line: 1, col: 8 },
},
});
check_from_str_bytes_reader::<NewType>(bogus_struct, expected_err.clone());
check_error_span_exclusive::<NewType>(bogus_struct, expected_err, "NewType");
check_from_str_bytes_reader::<UnnamedNewType>(
"",
Err(SpannedError {
code: Error::ExpectedStructLike,
end: Position { line: 1, col: 1 },
}),
);
check_from_str_bytes_reader("(33)", Ok(UnnamedNewType(33)));
code: Error::ExpectedNamedStructLike(""),
check_from_str_bytes_reader::<UnnamedNewType>(bogus_struct, expected_err.clone());
check_error_span_exclusive::<UnnamedNewType>(bogus_struct, expected_err, "NewType");
check_from_str_bytes_reader("TupleStruct(2,5,)", Ok(TupleStruct(2.0, 5.0)));
check_from_str_bytes_reader("(3,4)", Ok(TupleStruct(3.0, 4.0)));
check_from_str_bytes_reader::<TupleStruct>(
code: Error::ExpectedNamedStructLike("TupleStruct"),
let bogus_struct = "TupleStruct(2,5,)";
end: Position { line: 1, col: 12 },
check_from_str_bytes_reader::<UnnamedTupleStruct>(bogus_struct, expected_err.clone());
check_error_span_exclusive::<UnnamedTupleStruct>(bogus_struct, expected_err, "TupleStruct");
check_from_str_bytes_reader("(3,4)", Ok(UnnamedTupleStruct(3.0, 4.0)));
check_from_str_bytes_reader::<UnnamedTupleStruct>(
fn test_unclosed_limited_seq_struct() {
#[derive(Debug, PartialEq)]
struct LimitedStruct;
impl<'de> serde::Deserialize<'de> for LimitedStruct {
fn deserialize<D: serde::Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
struct Visitor;
impl<'de> serde::de::Visitor<'de> for Visitor {
type Value = LimitedStruct;
// GRCOV_EXCL_START
fn expecting(&self, fmt: &mut core::fmt::Formatter) -> core::fmt::Result {
fmt.write_str("struct LimitedStruct")
// GRCOV_EXCL_STOP
fn visit_map<A: serde::de::MapAccess<'de>>(
self,
_map: A,
) -> Result<Self::Value, A::Error> {
Ok(LimitedStruct)
deserializer.deserialize_struct("LimitedStruct", &[], Visitor)
check_from_str_bytes_reader::<LimitedStruct>(
"(",
code: Error::ExpectedStructLikeEnd,
end: Position { line: 1, col: 2 },
)
fn test_unclosed_limited_seq() {
struct LimitedSeq;
impl<'de> serde::Deserialize<'de> for LimitedSeq {
type Value = LimitedSeq;
fmt.write_str("an empty sequence")
fn visit_seq<A: serde::de::SeqAccess<'de>>(
_seq: A,
Ok(LimitedSeq)
deserializer.deserialize_seq(Visitor)
check_from_str_bytes_reader::<LimitedSeq>(
"[",
code: Error::ExpectedArrayEnd,
assert_eq!(
crate::Value::from(vec![42]).into_rust::<LimitedSeq>(),
Err(Error::ExpectedDifferentLength {
expected: String::from("a sequence of length 0"),
found: 1
})
fn test_unclosed_limited_map() {
struct LimitedMap;
impl<'de> serde::Deserialize<'de> for LimitedMap {
type Value = LimitedMap;
fmt.write_str("an empty map")
Ok(LimitedMap)
deserializer.deserialize_map(Visitor)
check_from_str_bytes_reader::<LimitedMap>(
"{",
code: Error::ExpectedMapEnd,
crate::Value::Map([("a", 42)].into_iter().collect()).into_rust::<LimitedMap>(),
expected: String::from("a map of length 0"),
fn test_option() {
check_from_str_bytes_reader("Some(1)", Ok(Some(1u8)));
check_from_str_bytes_reader("None", Ok(None::<u8>));
fn test_enum() {
check_from_str_bytes_reader("A", Ok(MyEnum::A));
check_from_str_bytes_reader("B(true,)", Ok(MyEnum::B(true)));
check_from_str_bytes_reader::<MyEnum>(
"B",
check_from_str_bytes_reader("C(true,3.5,)", Ok(MyEnum::C(true, 3.5)));
check_from_str_bytes_reader("D(a:2,b:3,)", Ok(MyEnum::D { a: 2, b: 3 }));
fn test_array() {
check_from_str_bytes_reader::<[i32; 0]>("()", Ok([]));
check_from_str_bytes_reader("[]", Ok(Vec::<i32>::new()));
check_from_str_bytes_reader("(2,3,4,)", Ok([2, 3, 4i32]));
check_from_str_bytes_reader("[2,3,4,]", Ok([2, 3, 4i32].to_vec()));
#[cfg(feature = "std")]
fn test_map() {
use std::collections::HashMap;
let mut map = HashMap::new();
map.insert((true, false), 4);
map.insert((false, false), 123);
check_from_str_bytes_reader(
"{
(true,false,):4,
(false,false,):123,
}",
Ok(map),
fn test_string() {
check_from_str_bytes_reader("\"String\"", Ok(String::from("String")));
check_from_str_bytes_reader("r\"String\"", Ok(String::from("String")));
check_from_str_bytes_reader("r#\"String\"#", Ok(String::from("String")));
"r#\"String with\nmultiple\nlines\n\"#",
Ok(String::from("String with\nmultiple\nlines\n")),
"r##\"String with \"#\"##",
Ok(String::from("String with \"#")),
fn test_char() {
check_from_str_bytes_reader("'c'", Ok('c'));
fn test_escape_char() {
check_from_str_bytes_reader("'\\''", Ok('\''));
fn test_escape() {
check_from_str_bytes_reader(r#""\"Quoted\"""#, Ok(String::from("\"Quoted\"")));
fn test_comment() {
"(
x: 1.0, // x is just 1
// There is another comment in the very next line..
// And y is indeed
y: 2.0 // 2!
)",
Ok(MyStruct { x: 1.0, y: 2.0 }),
fn err<T>(
kind: Error,
(line_start, col_start): (usize, usize),
(line_end, col_end): (usize, usize),
) -> SpannedResult<T> {
code: kind,
start: Position {
line: line_start,
col: col_start,
end: Position {
line: line_end,
col: col_end,
fn test_err_wrong_value() {
check_from_str_bytes_reader::<f32>("'c'", err(Error::ExpectedFloat, (1, 1), (1, 1)));
check_from_str_bytes_reader::<String>("'c'", err(Error::ExpectedString, (1, 1), (1, 1)));
check_from_str_bytes_reader::<HashMap<u32, u32>>(
"'c'",
err(Error::ExpectedMap, (1, 1), (1, 1)),
check_from_str_bytes_reader::<[u8; 5]>("'c'", err(Error::ExpectedStructLike, (1, 1), (1, 1)));
check_from_str_bytes_reader::<Vec<u32>>("'c'", err(Error::ExpectedArray, (1, 1), (1, 1)));
check_from_str_bytes_reader::<MyEnum>("'c'", err(Error::ExpectedIdentifier, (1, 1), (1, 1)));
check_from_str_bytes_reader::<MyStruct>(
err(Error::ExpectedNamedStructLike("MyStruct"), (1, 1), (1, 1)),
"NotMyStruct(x: 4, y: 2)",
err(
Error::ExpectedDifferentStructName {
expected: "MyStruct",
found: String::from("NotMyStruct"),
(1, 1),
(1, 12),
),
check_from_str_bytes_reader::<(u8, bool)>(
err(Error::ExpectedStructLike, (1, 1), (1, 1)),
check_from_str_bytes_reader::<bool>("notabool", err(Error::ExpectedBoolean, (1, 1), (1, 1)));
let bogus_struct = "MyStruct(\n x: true)";
let expected_err = err(Error::ExpectedFloat, (2, 7), (2, 8));
check_from_str_bytes_reader::<MyStruct>(bogus_struct, expected_err.clone());
check_error_span_inclusive::<MyStruct>(bogus_struct, expected_err, " t");
let bogus_struct = "MyStruct(\n x: 3.5, \n y:)";
let expected_err = err(Error::ExpectedFloat, (3, 7), (3, 7));
check_error_span_inclusive::<MyStruct>(bogus_struct, expected_err, ")");
fn test_perm_ws() {
"\nMyStruct \t ( \n x : 3.5 , \t y\n: 4.5 \n ) \t\n",
Ok(MyStruct { x: 3.5, y: 4.5 }),
"\nTupleStruct \t ( \n 3.5 , \t\n 4.5 \n ) \t\n",
Ok(TupleStruct(3.5, 4.5)),
check_from_str_bytes_reader("\nNewType \t ( \n 42 \n ) \t\n", Ok(NewType(42)));
fn untagged() {
#[derive(Deserialize, Clone, Debug, PartialEq)]
#[serde(untagged)]
enum Untagged {
U8(u8),
Bool(bool),
Value(crate::Value),
check_from_str_bytes_reader("true", Ok(Untagged::Bool(true)));
check_from_str_bytes_reader("8", Ok(Untagged::U8(8)));
// Check for a failure in Deserializer::check_struct_type
// - untagged enum and a leading identifier trigger the serde content enum path
// - serde content uses deserialize_any, which retriggers the struct type check
// - struct type check inside a serde content performs a full newtype check
// - newtype check fails on the unclosed struct
//
let bogus_struct = "Value(()";
let expected_err = Err(crate::error::SpannedError {
code: crate::Error::Eof,
start: Position { line: 1, col: 8 },
end: crate::error::Position { line: 1, col: 9 },
check_from_str_bytes_reader::<Untagged>(bogus_struct, expected_err.clone());
check_error_span_exclusive::<Untagged>(bogus_struct, expected_err, ")");
fn rename() {
#[derive(Deserialize, Debug, PartialEq)]
enum Foo {
#[serde(rename = "2d")]
D2,
#[serde(rename = "triangle-list")]
TriangleList,
check_from_str_bytes_reader("r#2d", Ok(Foo::D2));
check_from_str_bytes_reader("r#triangle-list", Ok(Foo::TriangleList));
fn forgot_apostrophes() {
let bogus_struct = "(4, \"Hello)";
code: Error::ExpectedStringEnd,
start: Position { line: 1, col: 5 },
end: Position { line: 1, col: 6 },
check_from_str_bytes_reader::<(i32, String)>(bogus_struct, expected_err.clone());
check_error_span_exclusive::<(i32, String)>(bogus_struct, expected_err, "\"");
fn expected_attribute() {
check_from_str_bytes_reader::<String>(
"#\"Hello\"",
err(Error::ExpectedAttribute, (1, 2), (1, 2)),
fn expected_attribute_end() {
let bogus_struct = "#![enable(unwrap_newtypes) \"Hello\"";
let expected_err = err(Error::ExpectedAttributeEnd, (1, 27), (1, 28));
check_from_str_bytes_reader::<String>(bogus_struct, expected_err.clone());
check_error_span_inclusive::<String>(bogus_struct, expected_err, " \"");
fn invalid_attribute() {
let bogus_struct = "#![enable(invalid)] \"Hello\"";
let expected_err = err(
Error::NoSuchExtension("invalid".to_string()),
(1, 11),
(1, 18),
check_error_span_exclusive::<String>(bogus_struct, expected_err, "invalid");
fn multiple_attributes() {
struct New(String);
"#![enable(unwrap_newtypes)] #![enable(unwrap_newtypes)] \"Hello\"",
Ok(New("Hello".to_owned())),
fn type_schema_attributes() {
"#![type = \"my::Type\"] \"Hello\"",
Ok("Hello".to_owned()),
"#![schema = \"./schemas/app.schema.ron\"] \"Hello\"",
fn mixed_attributes() {
"#![type = \"my::Type\"] #![enable(unwrap_newtypes)] \"Hello\"",
fn uglified_attribute() {
"# !\
// We definitely want to add a comment here
[\t\tenable( // best style ever
unwrap_newtypes ) ] ()",
Ok(()),
fn implicit_some() {
use serde::de::DeserializeOwned;
fn de<T: DeserializeOwned>(s: &str) -> Option<T> {
let enable = "#![enable(implicit_some)]\n".to_string();
super::from_str::<Option<T>>(&(enable + s)).unwrap()
assert_eq!(de("'c'"), Some('c'));
assert_eq!(de("5"), Some(5));
assert_eq!(de("\"Hello\""), Some("Hello".to_owned()));
assert_eq!(de("false"), Some(false));
de("MyStruct(x: .4, y: .5)"),
Some(MyStruct { x: 0.4, y: 0.5 })
assert_eq!(de::<char>("None"), None);
// Not concise
assert_eq!(de::<Option<Option<char>>>("None"), None);
fn ws_tuple_newtype_variant() {
check_from_str_bytes_reader("B ( \n true \n ) ", Ok(MyEnum::B(true)));
fn test_byte_stream() {
"BytesStruct( small:[1, 2], large:b\"\\x01\\x02\\x03\\x04\" )",
Ok(BytesStruct {
small: vec![1, 2],
large: vec![1, 2, 3, 4],
fn test_numbers() {
"[1_234, 12_345, 1_2_3_4_5_6, 1_234_567, 5_55_55_5]",
Ok(vec![1234, 12345, 123_456, 1_234_567, 555_555]),
fn check_de_any_number<
T: Copy + PartialEq + core::fmt::Debug + Into<Number> + serde::de::DeserializeOwned,
>(
s: &str,
cmp: T,
) {
let mut parser = Parser::new(s).unwrap();
let number = parser.any_number().unwrap();
assert_eq!(number, Number::new(cmp));
Number::new(super::from_str::<T>(s).unwrap()),
Number::new(cmp)
fn test_any_number_precision() {
check_de_any_number("1", 1_u8);
check_de_any_number("+1", 1_u8);
check_de_any_number("-1", -1_i8);
check_de_any_number("-1.0", -1.0_f32);
check_de_any_number("1.", 1.0_f32);
check_de_any_number("-1.", -1.0_f32);
check_de_any_number(".3", 0.3_f64);
check_de_any_number("-.3", -0.3_f64);
check_de_any_number("+.3", 0.3_f64);
check_de_any_number("0.3", 0.3_f64);
check_de_any_number("NaN", f32::NAN);
check_de_any_number("-NaN", -f32::NAN);
check_de_any_number("inf", f32::INFINITY);
check_de_any_number("-inf", f32::NEG_INFINITY);
macro_rules! test_min {
($($ty:ty),*) => {
$(check_de_any_number(&format!("{}", <$ty>::MIN), <$ty>::MIN);)*
macro_rules! test_max {
$(check_de_any_number(&format!("{}", <$ty>::MAX), <$ty>::MAX);)*
test_min! { i8, i16, i32, i64, f64 }
test_max! { u8, u16, u32, u64, f64 }
#[cfg(feature = "integer128")]
test_min! { i128 }
test_max! { u128 }
fn test_value_special_floats() {
use crate::{from_str, value::Number, Value};
from_str("NaN"),
Ok(Value::Number(Number::F32(f32::NAN.into())))
from_str("+NaN"),
from_str("-NaN"),
Ok(Value::Number(Number::F32((-f32::NAN).into())))
from_str("inf"),
Ok(Value::Number(Number::F32(f32::INFINITY.into())))
from_str("+inf"),
from_str("-inf"),
Ok(Value::Number(Number::F32(f32::NEG_INFINITY.into())))
fn test_leading_whitespace() {
check_from_str_bytes_reader(" +1", Ok(1_u8));
check_from_str_bytes_reader(" EmptyStruct1", Ok(EmptyStruct1));
fn check_from_str_bytes_reader<T: serde::de::DeserializeOwned + PartialEq + core::fmt::Debug>(
ron: &str,
check: SpannedResult<T>,
let res_str = super::from_str::<T>(ron);
assert_eq!(res_str, check);
let res_bytes = super::from_bytes::<T>(ron.as_bytes());
assert_eq!(res_bytes, check);
{
let res_reader = super::from_reader::<&[u8], T>(ron.as_bytes());
assert_eq!(res_reader, check);
fn test_remainder() {
let mut deserializer = super::Deserializer::from_str(" 42 ").unwrap();
<u8 as serde::Deserialize>::deserialize(&mut deserializer).unwrap(),
42
assert_eq!(deserializer.remainder(), " ");
assert_eq!(deserializer.end(), Ok(()));
let mut deserializer = super::Deserializer::from_str(" 42 37 ").unwrap();
assert_eq!(deserializer.remainder(), " 37 ");
assert_eq!(deserializer.end(), Err(Error::TrailingCharacters));
fn boolean_struct_name() {
check_from_str_bytes_reader::<bool>(
"true_",
code: Error::ExpectedBoolean,
"false_",