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https://github.com/RGBCube/serenity
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LibRegex: Support UTF-16 RegexStringView and improve Unicode matching
When the Unicode option is not set, regular expressions should match based on code units; when it is set, they should match based on code points. To do so, the regex parser must combine surrogate pairs when the Unicode option is set. Further, RegexStringView needs to know if the flag is set in order to return code point vs. code unit based string lengths and substrings.
This commit is contained in:
Timothy Flynn
Linus Groh
parent
2e45e52993
commit
47f6bb38a1
5 changed files with 167 additions and 21 deletions
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@ -14,6 +14,7 @@
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <AK/Utf16View.h>
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#include <AK/Utf32View.h>
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#include <AK/Utf8View.h>
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#include <AK/Variant.h>
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@ -43,6 +44,11 @@ public:
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{
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}
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RegexStringView(Utf16View view)
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: m_view(view)
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{
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}
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RegexStringView(Utf8View view)
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: m_view(view)
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{
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@ -58,11 +64,19 @@ public:
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return m_view.get<Utf32View>();
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}
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Utf16View const& u16_view() const
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{
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return m_view.get<Utf16View>();
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}
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Utf8View const& u8_view() const
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{
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return m_view.get<Utf8View>();
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}
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bool unicode() const { return m_unicode; }
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void set_unicode(bool unicode) { m_unicode = unicode; }
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bool is_empty() const
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{
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return m_view.visit([](auto& view) { return view.is_empty(); });
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@ -75,12 +89,21 @@ public:
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size_t length() const
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{
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return m_view.visit([](auto& view) { return view.length(); });
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if (unicode()) {
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return m_view.visit(
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[](Utf16View const& view) { return view.length_in_code_points(); },
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[](auto const& view) { return view.length(); });
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}
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return m_view.visit(
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[](Utf16View const& view) { return view.length_in_code_units(); },
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[](Utf8View const& view) { return view.byte_length(); },
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[](auto const& view) { return view.length(); });
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}
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RegexStringView construct_as_same(Span<u32> data, Optional<String>& optional_string_storage) const
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RegexStringView construct_as_same(Span<u32> data, Optional<String>& optional_string_storage, Vector<u16>& optional_utf16_storage) const
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{
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return m_view.visit(
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auto view = m_view.visit(
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[&]<typename T>(T const&) {
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StringBuilder builder;
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for (auto ch : data)
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@ -90,7 +113,14 @@ public:
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},
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[&](Utf32View) {
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return RegexStringView { Utf32View { data.data(), data.size() } };
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},
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[&](Utf16View) {
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optional_utf16_storage = AK::utf32_to_utf16(Utf32View { data.data(), data.size() });
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return RegexStringView { Utf16View { optional_utf16_storage } };
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});
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view.set_unicode(unicode());
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return view;
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}
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Vector<RegexStringView> lines() const
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@ -118,6 +148,21 @@ public:
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views.empend(view);
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return views;
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},
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[](Utf16View view) {
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Vector<RegexStringView> views;
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u16 newline = '\n';
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while (!view.is_empty()) {
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auto position = AK::memmem_optional(view.data(), view.length_in_code_units() * sizeof(u16), &newline, sizeof(u16));
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if (!position.has_value())
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break;
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auto offset = position.value() / sizeof(u16);
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views.empend(view.substring_view(0, offset));
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view = view.substring_view(offset + 1, view.length_in_code_units() - offset - 1);
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}
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if (!view.is_empty())
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views.empend(view);
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return views;
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},
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[](Utf8View& view) {
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Vector<RegexStringView> views;
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auto it = view.begin();
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@ -147,15 +192,26 @@ public:
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RegexStringView substring_view(size_t offset, size_t length) const
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{
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return m_view.visit(
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[&](auto view) { return RegexStringView { view.substring_view(offset, length) }; },
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[&](Utf8View const& view) { return RegexStringView { view.unicode_substring_view(offset, length) }; });
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if (unicode()) {
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auto view = m_view.visit(
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[&](auto view) { return RegexStringView { view.substring_view(offset, length) }; },
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[&](Utf16View const& view) { return RegexStringView { view.unicode_substring_view(offset, length) }; },
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[&](Utf8View const& view) { return RegexStringView { view.unicode_substring_view(offset, length) }; });
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view.set_unicode(unicode());
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return view;
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}
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auto view = m_view.visit([&](auto view) { return RegexStringView { view.substring_view(offset, length) }; });
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view.set_unicode(unicode());
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return view;
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}
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String to_string() const
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{
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return m_view.visit(
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[](StringView view) { return view.to_string(); },
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[](Utf16View view) { return view.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes); },
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[](auto& view) {
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StringBuilder builder;
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for (auto it = view.begin(); it != view.end(); ++it)
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@ -173,8 +229,8 @@ public:
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return 256u + ch;
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return ch;
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},
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[&](auto view) -> u32 { return view[index]; },
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[&](Utf8View& view) -> u32 {
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[&](Utf32View& view) -> u32 { return view[index]; },
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[&](auto& view) -> u32 {
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size_t i = index;
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for (auto it = view.begin(); it != view.end(); ++it, --i) {
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if (i == 0)
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@ -188,6 +244,7 @@ public:
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{
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return m_view.visit(
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[&](Utf32View) { return to_string() == cstring; },
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[&](Utf16View) { return to_string() == cstring; },
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[&](Utf8View const& view) { return view.as_string() == cstring; },
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[&](StringView view) { return view == cstring; });
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}
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@ -201,6 +258,7 @@ public:
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{
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return m_view.visit(
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[&](Utf32View) { return to_string() == string; },
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[&](Utf16View) { return to_string() == string; },
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[&](Utf8View const& view) { return view.as_string() == string; },
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[&](StringView view) { return view == string; });
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}
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@ -209,6 +267,7 @@ public:
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{
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return m_view.visit(
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[&](Utf32View) { return to_string() == string; },
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[&](Utf16View) { return to_string() == string; },
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[&](Utf8View const& view) { return view.as_string() == string; },
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[&](StringView view) { return view == string; });
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}
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@ -224,6 +283,7 @@ public:
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[&](Utf32View view) {
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return view.length() == other.length() && __builtin_memcmp(view.code_points(), other.code_points(), view.length() * sizeof(u32)) == 0;
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},
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[&](Utf16View) { return to_string() == RegexStringView { other }.to_string(); },
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[&](Utf8View const& view) { return view.as_string() == RegexStringView { other }.to_string(); },
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[&](StringView view) { return view == RegexStringView { other }.to_string(); });
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}
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@ -233,12 +293,25 @@ public:
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return !(*this == other);
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}
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bool operator==(Utf16View const& other) const
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{
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return m_view.visit(
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[&](Utf32View) { return to_string() == RegexStringView { other }.to_string(); },
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[&](Utf16View const& view) { return view == other; },
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[&](Utf8View const& view) { return view.as_string() == RegexStringView { other }.to_string(); },
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[&](StringView view) { return view == RegexStringView { other }.to_string(); });
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}
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bool operator!=(Utf16View const& other) const
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{
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return !(*this == other);
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}
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bool operator==(Utf8View const& other) const
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{
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return m_view.visit(
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[&](Utf32View) {
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return to_string() == other.as_string();
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},
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[&](Utf32View) { return to_string() == other.as_string(); },
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[&](Utf16View) { return to_string() == other.as_string(); },
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[&](Utf8View const& view) { return view.as_string() == other.as_string(); },
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[&](StringView view) { return other.as_string() == view; });
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}
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@ -271,6 +344,9 @@ public:
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[&](Utf32View) -> bool {
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TODO();
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},
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[&](Utf16View) -> bool {
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TODO();
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},
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[&](Utf8View const& view) { return view.as_string().starts_with(str); },
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[&](StringView view) { return view.starts_with(str); });
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}
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@ -289,6 +365,7 @@ public:
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}
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return true;
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},
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[&](Utf16View) -> bool { TODO(); },
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[&](Utf8View const& view) {
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auto it = view.begin();
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for (auto code_point : str) {
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@ -304,7 +381,8 @@ public:
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}
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private:
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Variant<StringView, Utf8View, Utf32View> m_view;
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Variant<StringView, Utf8View, Utf16View, Utf32View> m_view;
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bool m_unicode { false };
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};
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class Match final {
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