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std.json: Add JSONValue.toHash

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Allows using JSON values in sets and map keys.
This commit is contained in:
Vladimir Panteleev 2025-03-22 17:16:50 +00:00
parent ea28abfadb
commit 6beff688d2
1 changed files with 47 additions and 0 deletions
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47
std/json.d
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@ -1070,6 +1070,41 @@ struct JSONValue
}
}
/// Calculate a numerical hash value for this value,
/// allowing `JSONValue` to be used in associative arrays.
hash_t toHash() const @nogc nothrow pure @trusted
{
final switch (type_tag)
{
case JSONType.integer:
return hashOf(store.integer);
case JSONType.uinteger:
return hashOf(store.uinteger);
case JSONType.float_:
return hashOf(store.floating);
case JSONType.string:
return hashOf(store.str);
case JSONType.object:
hash_t result = hashOf(type_tag);
if (!store.object.isOrdered)
foreach (ref pair; store.object.unordered.byKeyValue)
result ^= hashOf(pair.key, pair.value.toHash());
else
foreach (ref pair; store.object.ordered)
result ^= hashOf(pair.key, pair.value.toHash());
return result;
case JSONType.array:
hash_t result = hashOf(type_tag);
foreach (ref v; store.array)
result = hashOf(v, result);
return result;
case JSONType.true_:
case JSONType.false_:
case JSONType.null_:
return hashOf(type_tag);
}
}
///
@safe unittest
{
@ -2748,3 +2783,15 @@ pure nothrow @safe unittest
assert(app.data == s, app.data);
}
@safe unittest
{
bool[JSONValue] aa;
aa[JSONValue("test")] = true;
assert(parseJSON(`"test"`) in aa);
assert(parseJSON(`"boo"`) !in aa);
aa[JSONValue(int(5))] = true;
assert(JSONValue(int(5)) in aa);
assert(JSONValue(uint(5)) in aa);
}