LibJS: Disallow mixed-sign durations in Intl.DurationFormat

This is a normative change in the Intl.DurationFormat spec.

See: 89ab1855

Userland/Libraries/LibJS/Runtime/Intl/DurationFormat.cpp

@@ -130,7 +130,7 @@ StringView DurationFormat::display_to_string(Display display)
     }
 }
 
-// 1.1.1 ToDurationRecord ( input ), https://tc39.es/proposal-intl-duration-format/#sec-todurationrecord
+// 1.1.3 ToDurationRecord ( input ), https://tc39.es/proposal-intl-duration-format/#sec-todurationrecord
 ThrowCompletionOr<Temporal::DurationRecord> to_duration_record(GlobalObject& global_object, Value input)
 {
     auto& vm = global_object.vm();
@@ -183,7 +183,62 @@ ThrowCompletionOr<Temporal::DurationRecord> to_duration_record(GlobalObject& glo
     return result;
 }
 
-// 1.1.2 GetDurationUnitOptions ( unit, options, baseStyle, stylesList, digitalBase, prevStyle ), https://tc39.es/proposal-intl-duration-format/#sec-getdurationunitoptions
+// 1.1.4 DurationSign ( record ), https://tc39.es/proposal-intl-duration-format/#sec-durationsign
+i8 duration_sign(Temporal::DurationRecord const& record)
+{
+    // 1. For each row in Table 1, except the header row, in table order, do
+    for (auto const& duration_instances_component : duration_instances_components) {
+        // a. Let valueSlot be the Value Slot value.
+        auto value_slot = duration_instances_component.value_slot;
+
+        // b. Let v be value of the valueSlot slot of record.
+        auto value = record.*value_slot;
+
+        // c. If v < 0, return -1.
+        if (value < 0)
+            return -1;
+
+        // d. If v > 0, return 1.
+        if (value > 0)
+            return 1;
+    }
+
+    // 2. Return 0.
+    return 0;
+}
+
+// 1.1.5 IsValidDurationRecord ( record ), https://tc39.es/proposal-intl-duration-format/#sec-isvaliddurationrecord
+bool is_valid_duration_record(Temporal::DurationRecord const& record)
+{
+    // 1. Let sign be ! DurationSign(record).
+    auto sign = duration_sign(record);
+
+    // 2. For each row in Table 1, except the header row, in table order, do
+    for (auto const& duration_instances_component : duration_instances_components) {
+        // a. Let valueSlot be the Value Slot value.
+        auto value_slot = duration_instances_component.value_slot;
+
+        // b. Let v be value of the valueSlot slot of record.
+        auto value = record.*value_slot;
+
+        // c. If 𝔽(v) is not finite, return false.
+        if (!isfinite(value))
+            return false;
+
+        // d. If v < 0 and sign > 0, return false.
+        if (value < 0 && sign > 0)
+            return false;
+
+        // e. If v > 0 and sign < 0, return false.
+        if (value > 0 && sign < 0)
+            return false;
+    }
+
+    // 3. Return true.
+    return true;
+}
+
+// 1.1.6 GetDurationUnitOptions ( unit, options, baseStyle, stylesList, digitalBase, prevStyle ), https://tc39.es/proposal-intl-duration-format/#sec-getdurationunitoptions
 ThrowCompletionOr<DurationUnitOptions> get_duration_unit_options(GlobalObject& global_object, String const& unit, Object const& options, StringView base_style, Span<StringView const> styles_list, StringView digital_base, Optional<String> const& previous_style)
 {
     auto& vm = global_object.vm();
@@ -252,7 +307,7 @@ static String convert_number_format_pattern_to_duration_format_template(Unicode:
     return result;
 }
 
-// 1.1.3 PartitionDurationFormatPattern ( durationFormat, duration ), https://tc39.es/proposal-intl-duration-format/#sec-partitiondurationformatpattern
+// 1.1.7 PartitionDurationFormatPattern ( durationFormat, duration ), https://tc39.es/proposal-intl-duration-format/#sec-partitiondurationformatpattern
 ThrowCompletionOr<Vector<PatternPartition>> partition_duration_format_pattern(GlobalObject& global_object, DurationFormat const& duration_format, Temporal::DurationRecord const& duration)
 {
     auto& vm = global_object.vm();

Userland/Libraries/LibJS/Runtime/Intl/DurationFormat.h

@@ -219,6 +219,8 @@ struct DurationUnitOptions {
 };
 
 ThrowCompletionOr<Temporal::DurationRecord> to_duration_record(GlobalObject& global_object, Value input);
+i8 duration_sign(Temporal::DurationRecord const&);
+bool is_valid_duration_record(Temporal::DurationRecord const&);
 ThrowCompletionOr<DurationUnitOptions> get_duration_unit_options(GlobalObject& global_object, String const& unit, Object const& options, StringView base_style, Span<StringView const> styles_list, StringView digital_base, Optional<String> const& previous_style);
 ThrowCompletionOr<Vector<PatternPartition>> partition_duration_format_pattern(GlobalObject& global_object, DurationFormat const& duration_format, Temporal::DurationRecord const& duration);
 

Userland/Libraries/LibJS/Runtime/Intl/DurationFormatPrototype.cpp

@@ -41,19 +41,23 @@ JS_DEFINE_NATIVE_FUNCTION(DurationFormatPrototype::format)
     // 3. Let record be ? ToDurationRecord(duration).
     auto record = TRY(to_duration_record(global_object, vm.argument(0)));
 
-    // 4. Let formatted be ? PartitionDurationFormatPattern(df, record).
+    // 4. If IsValidDurationRecord(record) is false, throw a RangeError exception.
+    if (!is_valid_duration_record(record))
+        return vm.throw_completion<RangeError>(global_object, ErrorType::TemporalInvalidDurationLikeObject);
+
+    // 5. Let formatted be ? PartitionDurationFormatPattern(df, record).
     auto formatted = TRY(partition_duration_format_pattern(global_object, *duration_format, record));
 
-    // 5. Let result be a new empty String.
+    // 6. Let result be a new empty String.
     StringBuilder result;
 
-    // 6. For each element part in formatted, in List order, do
+    // 7. For each element part in formatted, in List order, do
     for (auto const& part : formatted) {
         // a. Set result to the string-concatenation of result and part.[[Value]].
         result.append(part.value);
     }
 
-    // 7. Return result.
+    // 8. Return result.
     return js_string(vm, result.build());
 }
 
@@ -67,14 +71,18 @@ JS_DEFINE_NATIVE_FUNCTION(DurationFormatPrototype::format_to_parts)
     // 3. Let record be ? ToDurationRecord(duration).
     auto record = TRY(to_duration_record(global_object, vm.argument(0)));
 
-    // 4. Let formatted be ? PartitionDurationFormatPattern(df, record).
+    // 4. If IsValidDurationRecord(record) is false, throw a RangeError exception.
+    if (!is_valid_duration_record(record))
+        return vm.throw_completion<RangeError>(global_object, ErrorType::TemporalInvalidDurationLikeObject);
+
+    // 5. Let formatted be ? PartitionDurationFormatPattern(df, record).
     auto formatted = TRY(partition_duration_format_pattern(global_object, *duration_format, record));
 
-    // 5. Let result be ! ArrayCreate(0).
+    // 6. Let result be ! ArrayCreate(0).
     auto* result = MUST(Array::create(global_object, 0));
 
-    // 6. Let n be 0.
+    // 7. Let n be 0.
-    // 7. For each element part in formatted, in List order, do
+    // 8. For each element part in formatted, in List order, do
     for (size_t n = 0; n < formatted.size(); ++n) {
         auto const& part = formatted[n];
 
@@ -93,7 +101,7 @@ JS_DEFINE_NATIVE_FUNCTION(DurationFormatPrototype::format_to_parts)
         // e. Increment n by 1.
     }
 
-    // 7. Return result.
+    // 9. Return result.
     return result;
 }
 

Userland/Libraries/LibJS/Tests/builtins/Intl/DurationFormat/DurationFormat.prototype.format.js

@@ -63,3 +63,58 @@ describe("correct behavior", () => {
         ).toBe("1 J, 2 M, 3 W, 3 T, 4 Std., 5 Min., 6 Sek., 7 ms und 8,009 μs");
     });
 });
+
+describe("errors", () => {
+    test("non-object duration records", () => {
+        [-100, Infinity, NaN, "hello", 152n, Symbol("foo")].forEach(value => {
+            expect(() => {
+                new Intl.DurationFormat().format(value);
+            }).toThrowWithMessage(TypeError, "is not an object");
+        });
+    });
+
+    test("empty duration record", () => {
+        expect(() => {
+            new Intl.DurationFormat().format({});
+        }).toThrowWithMessage(TypeError, "Invalid duration-like object");
+
+        expect(() => {
+            new Intl.DurationFormat().format({ foo: 123 });
+        }).toThrowWithMessage(TypeError, "Invalid duration-like object");
+    });
+
+    test("non-integral duration fields", () => {
+        [
+            "years",
+            "months",
+            "weeks",
+            "days",
+            "hours",
+            "minutes",
+            "seconds",
+            "milliseconds",
+            "microseconds",
+            "nanoseconds",
+        ].forEach(field => {
+            expect(() => {
+                new Intl.DurationFormat().format({ [field]: 1.5 });
+            }).toThrowWithMessage(
+                RangeError,
+                `Invalid value for duration property '${field}': must be an integer, got 1.5`
+            );
+
+            expect(() => {
+                new Intl.DurationFormat().format({ [field]: -Infinity });
+            }).toThrowWithMessage(
+                RangeError,
+                `Invalid value for duration property '${field}': must be an integer, got -Infinity`
+            );
+        });
+    });
+
+    test("inconsistent field signs", () => {
+        expect(() => {
+            new Intl.DurationFormat().format({ years: 1, months: -1 });
+        }).toThrowWithMessage(RangeError, "Invalid duration-like object");
+    });
+});

Userland/Libraries/LibJS/Tests/builtins/Intl/DurationFormat/DurationFormat.prototype.formatToParts.js

@@ -263,3 +263,58 @@ describe("correct behavior", () => {
         ]);
     });
 });
+
+describe("errors", () => {
+    test("non-object duration records", () => {
+        [-100, Infinity, NaN, "hello", 152n, Symbol("foo")].forEach(value => {
+            expect(() => {
+                new Intl.DurationFormat().formatToParts(value);
+            }).toThrowWithMessage(TypeError, "is not an object");
+        });
+    });
+
+    test("empty duration record", () => {
+        expect(() => {
+            new Intl.DurationFormat().formatToParts({});
+        }).toThrowWithMessage(TypeError, "Invalid duration-like object");
+
+        expect(() => {
+            new Intl.DurationFormat().formatToParts({ foo: 123 });
+        }).toThrowWithMessage(TypeError, "Invalid duration-like object");
+    });
+
+    test("non-integral duration fields", () => {
+        [
+            "years",
+            "months",
+            "weeks",
+            "days",
+            "hours",
+            "minutes",
+            "seconds",
+            "milliseconds",
+            "microseconds",
+            "nanoseconds",
+        ].forEach(field => {
+            expect(() => {
+                new Intl.DurationFormat().formatToParts({ [field]: 1.5 });
+            }).toThrowWithMessage(
+                RangeError,
+                `Invalid value for duration property '${field}': must be an integer, got 1.5`
+            );
+
+            expect(() => {
+                new Intl.DurationFormat().formatToParts({ [field]: -Infinity });
+            }).toThrowWithMessage(
+                RangeError,
+                `Invalid value for duration property '${field}': must be an integer, got -Infinity`
+            );
+        });
+    });
+
+    test("inconsistent field signs", () => {
+        expect(() => {
+            new Intl.DurationFormat().formatToParts({ years: 1, months: -1 });
+        }).toThrowWithMessage(RangeError, "Invalid duration-like object");
+    });
+});