LibJS: Start implementing the stage 3 Intl.DurationFormat proposal

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

@@ -0,0 +1,182 @@
+/*
+ * Copyright (c) 2022, Idan Horowitz <idan.horowitz@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Intl/AbstractOperations.h>
+#include <LibJS/Runtime/Intl/DurationFormat.h>
+
+namespace JS::Intl {
+
+// 1 DurationFormat Objects, https://tc39.es/proposal-intl-duration-format/#durationformat-objects
+DurationFormat::DurationFormat(Object& prototype)
+    : Object(prototype)
+{
+}
+
+DurationFormat::Style DurationFormat::style_from_string(StringView style)
+{
+    if (style == "long"sv)
+        return Style::Long;
+    if (style == "short"sv)
+        return Style::Short;
+    if (style == "narrow"sv)
+        return Style::Narrow;
+    if (style == "digital"sv)
+        return Style::Digital;
+    VERIFY_NOT_REACHED();
+}
+
+StringView DurationFormat::style_to_string(Style style)
+{
+    switch (style) {
+    case Style::Long:
+        return "long"sv;
+    case Style::Short:
+        return "short"sv;
+    case Style::Narrow:
+        return "narrow"sv;
+    case Style::Digital:
+        return "digital"sv;
+    default:
+        VERIFY_NOT_REACHED();
+    }
+}
+
+DurationFormat::ValueStyle DurationFormat::date_style_from_string(StringView date_style)
+{
+    if (date_style == "long"sv)
+        return ValueStyle::Long;
+    if (date_style == "short"sv)
+        return ValueStyle::Short;
+    if (date_style == "narrow"sv)
+        return ValueStyle::Narrow;
+    VERIFY_NOT_REACHED();
+}
+
+DurationFormat::ValueStyle DurationFormat::time_style_from_string(StringView time_style)
+{
+    if (time_style == "long"sv)
+        return ValueStyle::Long;
+    if (time_style == "short"sv)
+        return ValueStyle::Short;
+    if (time_style == "narrow"sv)
+        return ValueStyle::Narrow;
+    if (time_style == "numeric"sv)
+        return ValueStyle::Numeric;
+    if (time_style == "2-digit"sv)
+        return ValueStyle::TwoDigit;
+    VERIFY_NOT_REACHED();
+}
+
+DurationFormat::ValueStyle DurationFormat::sub_second_style_from_string(StringView sub_second_style)
+{
+    if (sub_second_style == "long"sv)
+        return ValueStyle::Long;
+    if (sub_second_style == "short"sv)
+        return ValueStyle::Short;
+    if (sub_second_style == "narrow"sv)
+        return ValueStyle::Narrow;
+    if (sub_second_style == "numeric"sv)
+        return ValueStyle::Numeric;
+    VERIFY_NOT_REACHED();
+}
+
+DurationFormat::Display DurationFormat::display_from_string(StringView display)
+{
+    if (display == "auto"sv)
+        return Display::Auto;
+    if (display == "always"sv)
+        return Display::Always;
+    VERIFY_NOT_REACHED();
+}
+
+StringView DurationFormat::value_style_to_string(ValueStyle value_style)
+{
+    switch (value_style) {
+    case ValueStyle::Long:
+        return "long"sv;
+    case ValueStyle::Short:
+        return "short"sv;
+    case ValueStyle::Narrow:
+        return "narrow"sv;
+    case ValueStyle::Numeric:
+        return "numeric"sv;
+    case ValueStyle::TwoDigit:
+        return "2-digit"sv;
+    default:
+        VERIFY_NOT_REACHED();
+    }
+}
+
+StringView DurationFormat::display_to_string(Display display)
+{
+    switch (display) {
+    case Display::Auto:
+        return "auto"sv;
+    case Display::Always:
+        return "always"sv;
+    default:
+        VERIFY_NOT_REACHED();
+    }
+}
+
+// 1.1.2 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();
+
+    // 1. Let style be ? GetOption(options, unit, "string", stylesList, undefined).
+    auto style_value = TRY(get_option(global_object, options, unit, OptionType::String, styles_list, Empty {}));
+
+    // 2. Let displayDefault be "always".
+    auto display_default = "always"sv;
+
+    String style;
+
+    // 3. If style is undefined, then
+    if (style_value.is_undefined()) {
+        // a. Set displayDefault to "auto".
+        display_default = "auto"sv;
+
+        // b. If baseStyle is "digital", then
+        if (base_style == "digital"sv) {
+            // i. Set style to digitalBase.
+            style = digital_base;
+        }
+        // c. Else,
+        else {
+            // i. Set style to baseStyle.
+            style = base_style;
+        }
+    } else {
+        style = style_value.as_string().string();
+    }
+
+    // 4. Let displayField be the string-concatenation of unit and "Display".
+    auto display_field = String::formatted("{}Display", unit);
+
+    // 5. Let display be ? GetOption(options, displayField, "string", « "auto", "always" », displayDefault).
+    auto display = TRY(get_option(global_object, options, display_field, OptionType::String, { "auto"sv, "always"sv }, display_default));
+
+    // 6. If prevStyle is "numeric" or "2-digit", then
+    if (previous_style == "numeric"sv || previous_style == "2-digit"sv) {
+        // a. If style is not "numeric" or "2-digit", then
+        if (style != "numeric"sv && style != "2-digit"sv) {
+            // i. Throw a RangeError exception.
+            return vm.throw_completion<RangeError>(global_object, ErrorType::IntlNonNumericOr2DigitAfterNumericOr2Digit);
+        }
+        // b. Else if unit is "minutes" or "seconds", then
+        else if (unit == "minutes"sv || unit == "seconds"sv) {
+            // i. Set style to "2-digit".
+            style = "2-digit"sv;
+        }
+    }
+
+    // 7. Return the Record { [[Style]]: style, [[Display]]: display }.
+    return DurationUnitOptions { .style = move(style), .display = display.as_string().string() };
+}
+
+}