Source code
Revision control
Copy as Markdown
Other Tools
#![allow(clippy::too_many_lines)]
use serde::{de, Deserialize};
use std::fmt;
macro_rules! bad {
($toml:expr, $ty:ty, $msg:expr) => {
match basic_toml::from_str::<$ty>($toml) {
Ok(s) => panic!("parsed to: {:#?}", s),
Err(e) => assert_eq!(e.to_string(), $msg),
}
};
}
#[derive(Debug, Deserialize, PartialEq)]
struct Parent<T> {
p_a: T,
p_b: Vec<Child<T>>,
}
#[derive(Debug, Deserialize, PartialEq)]
#[serde(deny_unknown_fields)]
struct Child<T> {
c_a: T,
c_b: T,
}
#[derive(Debug, PartialEq)]
enum CasedString {
Lowercase(String),
Uppercase(String),
}
impl<'de> de::Deserialize<'de> for CasedString {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: de::Deserializer<'de>,
{
struct CasedStringVisitor;
impl<'de> de::Visitor<'de> for CasedStringVisitor {
type Value = CasedString;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a string")
}
fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
where
E: de::Error,
{
if s.is_empty() {
Err(de::Error::invalid_length(0, &"a non-empty string"))
} else if s.chars().all(|x| x.is_ascii_lowercase()) {
Ok(CasedString::Lowercase(s.to_string()))
} else if s.chars().all(|x| x.is_ascii_uppercase()) {
Ok(CasedString::Uppercase(s.to_string()))
} else {
Err(de::Error::invalid_value(
de::Unexpected::Str(s),
&"all lowercase or all uppercase",
))
}
}
}
deserializer.deserialize_any(CasedStringVisitor)
}
}
#[test]
fn custom_errors() {
basic_toml::from_str::<Parent<CasedString>>(
"
p_a = 'a'
p_b = [{c_a = 'a', c_b = 'c'}]
",
)
.unwrap();
// Custom error at p_b value.
bad!(
"
p_a = ''
# ^
",
Parent<CasedString>,
"invalid length 0, expected a non-empty string for key `p_a` at line 2 column 19"
);
// Missing field in table.
bad!(
"
p_a = 'a'
# ^
",
Parent<CasedString>,
"missing field `p_b` at line 1 column 1"
);
// Invalid type in p_b.
bad!(
"
p_a = 'a'
p_b = 1
# ^
",
Parent<CasedString>,
"invalid type: integer `1`, expected a sequence for key `p_b` at line 3 column 19"
);
// Sub-table in Vec is missing a field.
bad!(
"
p_a = 'a'
p_b = [
{c_a = 'a'}
# ^
]
",
Parent<CasedString>,
"missing field `c_b` for key `p_b` at line 4 column 17"
);
// Sub-table in Vec has a field with a bad value.
bad!(
"
p_a = 'a'
p_b = [
{c_a = 'a', c_b = '*'}
# ^
]
",
Parent<CasedString>,
"invalid value: string \"*\", expected all lowercase or all uppercase for key `p_b` at line 4 column 35"
);
// Sub-table in Vec is missing a field.
bad!(
"
p_a = 'a'
p_b = [
{c_a = 'a', c_b = 'b'},
{c_a = 'aa'}
# ^
]
",
Parent<CasedString>,
"missing field `c_b` for key `p_b` at line 5 column 17"
);
// Sub-table in the middle of a Vec is missing a field.
bad!(
"
p_a = 'a'
p_b = [
{c_a = 'a', c_b = 'b'},
{c_a = 'aa'},
# ^
{c_a = 'aaa', c_b = 'bbb'},
]
",
Parent<CasedString>,
"missing field `c_b` for key `p_b` at line 5 column 17"
);
// Sub-table in the middle of a Vec has a field with a bad value.
bad!(
"
p_a = 'a'
p_b = [
{c_a = 'a', c_b = 'b'},
{c_a = 'aa', c_b = 1},
# ^
{c_a = 'aaa', c_b = 'bbb'},
]
",
Parent<CasedString>,
"invalid type: integer `1`, expected a string for key `p_b` at line 5 column 36"
);
// Sub-table in the middle of a Vec has an extra field.
// FIXME: This location could be better.
bad!(
"
p_a = 'a'
p_b = [
{c_a = 'a', c_b = 'b'},
{c_a = 'aa', c_b = 'bb', c_d = 'd'},
# ^
{c_a = 'aaa', c_b = 'bbb'},
{c_a = 'aaaa', c_b = 'bbbb'},
]
",
Parent<CasedString>,
"unknown field `c_d`, expected `c_a` or `c_b` for key `p_b` at line 5 column 17"
);
// Sub-table in the middle of a Vec is missing a field.
// FIXME: This location is pretty off.
bad!(
"
p_a = 'a'
[[p_b]]
c_a = 'a'
c_b = 'b'
[[p_b]]
c_a = 'aa'
# c_b = 'bb' # <- missing field
[[p_b]]
c_a = 'aaa'
c_b = 'bbb'
[[p_b]]
# ^
c_a = 'aaaa'
c_b = 'bbbb'
",
Parent<CasedString>,
"missing field `c_b` for key `p_b` at line 12 column 13"
);
// Sub-table in the middle of a Vec has a field with a bad value.
bad!(
"
p_a = 'a'
[[p_b]]
c_a = 'a'
c_b = 'b'
[[p_b]]
c_a = 'aa'
c_b = '*'
# ^
[[p_b]]
c_a = 'aaa'
c_b = 'bbb'
",
Parent<CasedString>,
"invalid value: string \"*\", expected all lowercase or all uppercase for key `p_b.c_b` at line 8 column 19"
);
// Sub-table in the middle of a Vec has an extra field.
// FIXME: This location is pretty off.
bad!(
"
p_a = 'a'
[[p_b]]
c_a = 'a'
c_b = 'b'
[[p_b]]
c_a = 'aa'
c_d = 'dd' # unknown field
[[p_b]]
c_a = 'aaa'
c_b = 'bbb'
[[p_b]]
# ^
c_a = 'aaaa'
c_b = 'bbbb'
",
Parent<CasedString>,
"unknown field `c_d`, expected `c_a` or `c_b` for key `p_b` at line 12 column 13"
);
}
#[test]
fn serde_derive_deserialize_errors() {
bad!(
"
p_a = ''
# ^
",
Parent<String>,
"missing field `p_b` at line 1 column 1"
);
bad!(
"
p_a = ''
p_b = [
{c_a = ''}
# ^
]
",
Parent<String>,
"missing field `c_b` for key `p_b` at line 4 column 17"
);
bad!(
"
p_a = ''
p_b = [
{c_a = '', c_b = 1}
# ^
]
",
Parent<String>,
"invalid type: integer `1`, expected a string for key `p_b` at line 4 column 34"
);
// FIXME: This location could be better.
bad!(
"
p_a = ''
p_b = [
{c_a = '', c_b = '', c_d = ''},
# ^
]
",
Parent<String>,
"unknown field `c_d`, expected `c_a` or `c_b` for key `p_b` at line 4 column 17"
);
bad!(
"
p_a = 'a'
p_b = [
{c_a = '', c_b = 1, c_d = ''},
# ^
]
",
Parent<String>,
"invalid type: integer `1`, expected a string for key `p_b` at line 4 column 34"
);
}
#[test]
fn error_handles_crlf() {
bad!(
"\r\n\
[t1]\r\n\
[t2]\r\n\
a = 1\r\n\
. = 2\r\n\
",
serde_json::Value,
"expected a table key, found a period at line 5 column 1"
);
// Should be the same as above.
bad!(
"\n\
[t1]\n\
[t2]\n\
a = 1\n\
. = 2\n\
",
serde_json::Value,
"expected a table key, found a period at line 5 column 1"
);
}