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use jstrict::Value;
/// Comparison ignoring the order of array items and object entries.
pub trait Compare {
/// Checks whether the two values are equal, up to the order of array
/// items and object entries.
///
/// Two arrays are equal when they have the same length and each item of
/// one can be paired with a distinct, `compare`-equal item of the other.
/// An object containing a duplicate key never compares equal, since such
/// a document is not valid JSON-LD.
fn compare(&self, other: &Self) -> bool;
}
impl Compare for Value {
fn compare(&self, other: &Self) -> bool {
match (self, other) {
(Self::Null, Self::Null) => true,
(Self::Boolean(a), Self::Boolean(b)) => a == b,
(Self::Number(a), Self::Number(b)) => a == b,
(Self::String(a), Self::String(b)) => a == b,
(Self::Array(a), Self::Array(b)) if a.len() == b.len() => {
let mut selected = Vec::new();
selected.resize(b.len(), false);
'next_item: for item in a {
for (other, selected) in b.iter().zip(selected.iter_mut()) {
if !*selected && item.compare(other) {
*selected = true;
continue 'next_item;
}
}
return false;
}
true
}
(Self::Object(a), Self::Object(b)) if a.len() == b.len() => {
for entry in a {
// Duplicate keys mean the document isn't valid JSON-LD;
// treat as "not equal".
match b.get_unique(&*entry.key) {
Ok(Some(value)) => {
if !entry.value.compare(value) {
return false;
}
}
Ok(None) | Err(_) => return false,
}
}
true
}
_ => false,
}
}
}