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AK: Add JsonObject::get...() methods that return Optional

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`get()` is intended as a replacement for `get_deprecated()` and `get_ptr
()`. The former returns the same value for "key not found" and "key
found and contains `null`" which is ambiguous. The latter returns a raw
pointer which is spooky. Returning `Optional<JsonValue const&>` covers
all the previous uses for these.

The `get_foo()` methods are helpers to make user code less verbose. Most
of the time, we only want a specific type of value: if we want a number
and get a string, we respond the same as if the value was not there at
all. These make that easier to express.

This also adjusts the `has_i32()` method and friends to examine the
value instead of just looking at the underlying type.
This commit is contained in:
Sam Atkins 2022-12-21 12:19:23 +00:00 • committed by Tim Flynn
parent d1ad63c466
commit 8d3b268cca
2 changed files with 189 additions and 22 deletions
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38
AK/JsonObject.h
View file

@ -44,6 +44,10 @@ public:
[[nodiscard]] bool has_null(StringView key) const;
[[nodiscard]] bool has_bool(StringView key) const;
[[nodiscard]] bool has_string(StringView key) const;
[[nodiscard]] bool has_i8(StringView key) const;
[[nodiscard]] bool has_u8(StringView key) const;
[[nodiscard]] bool has_i16(StringView key) const;
[[nodiscard]] bool has_u16(StringView key) const;
[[nodiscard]] bool has_i32(StringView key) const;
[[nodiscard]] bool has_u32(StringView key) const;
[[nodiscard]] bool has_i64(StringView key) const;
@ -55,6 +59,40 @@ public:
[[nodiscard]] bool has_double(StringView key) const;
#endif
Optional<JsonValue const&> get(StringView key) const;
template<Integral T>
Optional<T> get_integer(StringView key) const
{
auto maybe_value = get(key);
if (maybe_value.has_value() && maybe_value->is_integer<T>())
return maybe_value->as_integer<T>();
return {};
}
Optional<i8> get_i8(StringView key) const;
Optional<u8> get_u8(StringView key) const;
Optional<i16> get_i16(StringView key) const;
Optional<u16> get_u16(StringView key) const;
Optional<i32> get_i32(StringView key) const;
Optional<u32> get_u32(StringView key) const;
Optional<i64> get_i64(StringView key) const;
Optional<u64> get_u64(StringView key) const;
Optional<FlatPtr> get_addr(StringView key) const;
Optional<bool> get_bool(StringView key) const;
#if !defined(KERNEL)
Optional<DeprecatedString> get_deprecated_string(StringView key) const;
#endif
Optional<JsonObject const&> get_object(StringView key) const;
Optional<JsonArray const&> get_array(StringView key) const;
#if !defined(KERNEL)
Optional<double> get_double(StringView key) const;
Optional<float> get_float(StringView key) const;
#endif
void set(DeprecatedString const& key, JsonValue value);
template<typename Callback>