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LibJS: Implement engineering and scientific number formatting

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Timothy Flynn 2021-11-14 10:03:31 -05:00 • committed by Linus Groh
parent 30fbb7d9cd
commit 4d79ab6866
4 changed files with 167 additions and 18 deletions
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63
Userland/Libraries/LibJS/Runtime/Intl/NumberFormat.cpp
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@ -859,9 +859,11 @@ Vector<PatternPartition> partition_notation_sub_pattern(NumberFormat& number_for
else {
// a. Let notationSubPattern be GetNotationSubPattern(numberFormat, exponent).
auto notation_sub_pattern = get_notation_sub_pattern(number_format, exponent);
if (!notation_sub_pattern.has_value())
return {};
// b. Let patternParts be PartitionPattern(notationSubPattern).
auto pattern_parts = partition_pattern(notation_sub_pattern);
auto pattern_parts = partition_pattern(*notation_sub_pattern);
// c. For each Record { [[Type]], [[Value]] } patternPart of patternParts, do
for (auto& pattern_part : pattern_parts) {
@ -960,20 +962,34 @@ Vector<PatternPartition> partition_notation_sub_pattern(NumberFormat& number_for
// vi. Else if p is equal to "scientificSeparator", then
else if (part == "scientificSeparator"sv) {
// 1. Let scientificSeparator be the ILND String representing the exponent separator.
auto scientific_separator = Unicode::get_number_system_symbol(number_format.data_locale(), number_format.numbering_system(), "exponential"sv).value_or("E"sv);
// 2. Append a new Record { [[Type]]: "exponentSeparator", [[Value]]: scientificSeparator } as the last element of result.
// FIXME: Implement this when GetNotationSubPattern is fully implemented.
result.append({ "exponentSeparator"sv, scientific_separator });
}
// vii. Else if p is equal to "scientificExponent", then
else if (part == "scientificExponent"sv) {
// 1. If exponent < 0, then
// a. Let minusSignSymbol be the ILND String representing the minus sign.
// b. Append a new Record { [[Type]]: "exponentMinusSign", [[Value]]: minusSignSymbol } as the last element of result.
// c. Let exponent be -exponent.
// 2. Let exponentResult be ToRawFixed(exponent, 1, 0, 0).
// 3. Append a new Record { [[Type]]: "exponentInteger", [[Value]]: exponentResult.[[FormattedString]] } as the last element of result.
if (exponent < 0) {
// a. Let minusSignSymbol be the ILND String representing the minus sign.
auto minus_sign_symbol = Unicode::get_number_system_symbol(number_format.data_locale(), number_format.numbering_system(), "minusSign"sv).value_or("-"sv);
// FIXME: Implement this when GetNotationSubPattern is fully implemented.
// b. Append a new Record { [[Type]]: "exponentMinusSign", [[Value]]: minusSignSymbol } as the last element of result.
result.append({ "exponentMinusSign"sv, minus_sign_symbol });
// c. Let exponent be -exponent.
exponent *= -1;
}
// 2. Let exponentResult be ToRawFixed(exponent, 1, 0, 0).
// Note: See the implementation of ToRawFixed for why we do not pass the 1.
auto exponent_result = to_raw_fixed(exponent, 0, 0);
// FIXME: The spec does not say to do this, but all of major engines perform this replacement.
// Without this, formatting with non-Latin numbering systems will produce non-localized results.
exponent_result.formatted_string = replace_digits_for_number_format(number_format, move(exponent_result.formatted_string));
// 3. Append a new Record { [[Type]]: "exponentInteger", [[Value]]: exponentResult.[[FormattedString]] } as the last element of result.
result.append({ "exponentInteger"sv, move(exponent_result.formatted_string) });
}
// viii. Else,
else {
@ -1454,23 +1470,36 @@ Optional<Variant<StringView, String>> get_number_format_pattern(NumberFormat& nu
}
// 15.1.15 GetNotationSubPattern ( numberFormat, exponent ), https://tc39.es/ecma402/#sec-getnotationsubpattern
StringView get_notation_sub_pattern([[maybe_unused]] NumberFormat& number_format, [[maybe_unused]] int exponent)
Optional<StringView> get_notation_sub_pattern(NumberFormat& number_format, int exponent)
{
// FIXME: Implement this.
// 1. Let localeData be %NumberFormat%.[[LocaleData]].
// 2. Let dataLocale be numberFormat.[[DataLocale]].
// 3. Let dataLocaleData be localeData.[[<dataLocale>]].
// 4. Let notationSubPatterns be dataLocaleData.[[notationSubPatterns]].
// 5. Assert: notationSubPatterns is a Record (see 15.3.3).
// 6. Let notation be numberFormat.[[Notation]].
auto notation = number_format.notation();
// 7. If notation is "scientific" or notation is "engineering", then
// a. Return notationSubPatterns.[[scientific]].
if ((notation == NumberFormat::Notation::Scientific) || (notation == NumberFormat::Notation::Engineering)) {
// a. Return notationSubPatterns.[[scientific]].
auto notation_sub_patterns = Unicode::get_standard_number_system_format(number_format.data_locale(), number_format.numbering_system(), Unicode::StandardNumberFormatType::Scientific);
if (!notation_sub_patterns.has_value())
return {};
return notation_sub_patterns->zero_format;
}
// 8. Else if exponent is not 0, then
// a. Assert: notation is "compact".
// b. Let compactDisplay be numberFormat.[[CompactDisplay]].
// c. Let compactPatterns be notationSubPatterns.[[compact]].[[<compactDisplay>]].
// d. Return compactPatterns.[[<exponent>]].
else if (exponent != 0) {
// FIXME: Implement this.
// a. Assert: notation is "compact".
// b. Let compactDisplay be numberFormat.[[CompactDisplay]].
// c. Let compactPatterns be notationSubPatterns.[[compact]].[[<compactDisplay>]].
// d. Return compactPatterns.[[<exponent>]].
}
// 9. Else,
// a. Return "{number}".
return "{number}"sv;