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LibUnicode: Implement word segmentation
This commit is contained in:
Idan Horowitz
parent
58b0eed6a7
commit
a593a5c8ab
2 changed files with 153 additions and 0 deletions
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@ -450,4 +450,156 @@ Vector<size_t> find_grapheme_segmentation_boundaries([[maybe_unused]] Utf16View
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#endif
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}
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Vector<size_t> find_word_segmentation_boundaries([[maybe_unused]] Utf16View const& view)
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{
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#if ENABLE_UNICODE_DATA
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using WBP = WordBreakProperty;
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Vector<size_t> boundaries;
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// https://www.unicode.org/reports/tr29/#Word_Boundary_Rules
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if (view.length_in_code_points() == 0)
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return boundaries;
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auto has_any_wbp = [](u32 code_point, auto&&... properties) {
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return (code_point_has_word_break_property(code_point, properties) || ...);
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};
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// WB1
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boundaries.append(0);
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if (view.length_in_code_points() > 1) {
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auto it = view.begin();
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auto code_point = *it;
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u32 next_code_point;
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Optional<u32> previous_code_point;
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auto current_ri_chain = 0;
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for (++it; it != view.end(); ++it, previous_code_point = code_point, code_point = next_code_point) {
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next_code_point = *it;
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auto code_point_is_cr = has_any_wbp(code_point, WBP::CR);
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auto next_code_point_is_lf = has_any_wbp(next_code_point, WBP::LF);
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// WB3
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if (code_point_is_cr && next_code_point_is_lf)
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continue;
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// WB3a, WB3b
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if (code_point_is_cr || next_code_point_is_lf || has_any_wbp(next_code_point, WBP::CR, WBP::Newline) || has_any_wbp(code_point, WBP::LF, WBP::Newline)) {
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boundaries.append(view.code_unit_offset_of(it));
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continue;
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}
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// WB3c
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if (has_any_wbp(code_point, WBP::ZWJ) && code_point_has_property(next_code_point, Property::Extended_Pictographic))
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continue;
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// WB3d
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if (has_any_wbp(code_point, WBP::WSegSpace) && has_any_wbp(next_code_point, WBP::WSegSpace))
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continue;
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// WB4
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if (has_any_wbp(next_code_point, WBP::Format, WBP::Extend, WBP::ZWJ))
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continue;
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auto code_point_is_hebrew_letter = has_any_wbp(code_point, WBP::Hebrew_Letter);
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auto code_point_is_ah_letter = code_point_is_hebrew_letter || has_any_wbp(code_point, WBP::ALetter);
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auto next_code_point_is_hebrew_letter = has_any_wbp(next_code_point, WBP::Hebrew_Letter);
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auto next_code_point_is_ah_letter = next_code_point_is_hebrew_letter || has_any_wbp(next_code_point, WBP::ALetter);
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// WB5
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if (code_point_is_ah_letter && next_code_point_is_ah_letter)
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continue;
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Optional<u32> next_next_code_point;
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if (it != view.end()) {
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auto it_copy = it;
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++it_copy;
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if (it_copy != view.end())
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next_next_code_point = *it;
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}
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bool next_next_code_point_is_hebrew_letter = next_next_code_point.has_value() && has_any_wbp(*next_next_code_point, WBP::Hebrew_Letter);
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bool next_next_code_point_is_ah_letter = next_next_code_point_is_hebrew_letter || (next_next_code_point.has_value() && has_any_wbp(*next_next_code_point, WBP::ALetter));
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auto next_code_point_is_mid_num_let_q = has_any_wbp(next_code_point, WBP::MidNumLet, WBP::Single_Quote);
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// WB6
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if (code_point_is_ah_letter && next_next_code_point_is_ah_letter && (next_code_point_is_mid_num_let_q || has_any_wbp(next_code_point, WBP::MidLetter)))
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continue;
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auto code_point_is_mid_num_let_q = has_any_wbp(code_point, WBP::MidNumLet, WBP::Single_Quote);
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auto previous_code_point_is_hebrew_letter = previous_code_point.has_value() && has_any_wbp(*previous_code_point, WBP::Hebrew_Letter);
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auto previous_code_point_is_ah_letter = previous_code_point_is_hebrew_letter || (previous_code_point.has_value() && has_any_wbp(*previous_code_point, WBP::ALetter));
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// WB7
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if (previous_code_point_is_ah_letter && next_code_point_is_ah_letter && (code_point_is_mid_num_let_q || has_any_wbp(code_point, WBP::MidLetter)))
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continue;
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// WB7a
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if (code_point_is_hebrew_letter && has_any_wbp(next_code_point, WBP::Single_Quote))
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continue;
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// WB7b
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if (code_point_is_hebrew_letter && next_next_code_point_is_hebrew_letter && has_any_wbp(next_code_point, WBP::Double_Quote))
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continue;
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// WB7c
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if (previous_code_point_is_hebrew_letter && next_code_point_is_hebrew_letter && has_any_wbp(code_point, WBP::Double_Quote))
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continue;
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auto code_point_is_numeric = has_any_wbp(code_point, WBP::Numeric);
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auto next_code_point_is_numeric = has_any_wbp(next_code_point, WBP::Numeric);
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// WB8
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if (code_point_is_numeric && next_code_point_is_numeric)
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continue;
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// WB9
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if (code_point_is_ah_letter && next_code_point_is_numeric)
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continue;
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// WB10
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if (code_point_is_numeric && next_code_point_is_ah_letter)
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continue;
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auto previous_code_point_is_numeric = previous_code_point.has_value() && has_any_wbp(code_point, WBP::Numeric);
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// WB11
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if (previous_code_point_is_numeric && next_code_point_is_numeric && (code_point_is_mid_num_let_q || has_any_wbp(code_point, WBP::MidNum)))
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continue;
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bool next_next_code_point_is_numeric = next_next_code_point.has_value() && has_any_wbp(*next_next_code_point, WBP::Numeric);
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// WB12
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if (code_point_is_numeric && next_next_code_point_is_numeric && (next_code_point_is_mid_num_let_q || has_any_wbp(next_code_point, WBP::MidNum)))
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continue;
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auto code_point_is_katakana = has_any_wbp(code_point, WBP::Katakana);
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auto next_code_point_is_katakana = has_any_wbp(next_code_point, WBP::Katakana);
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// WB13
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if (code_point_is_katakana && next_code_point_is_katakana)
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continue;
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auto code_point_is_extend_num_let = has_any_wbp(code_point, WBP::ExtendNumLet);
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// WB13a
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if ((code_point_is_ah_letter || code_point_is_numeric || code_point_is_katakana || code_point_is_extend_num_let) && has_any_wbp(next_code_point, WBP::ExtendNumLet))
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continue;
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// WB13b
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if (code_point_is_extend_num_let && (next_code_point_is_ah_letter || next_code_point_is_numeric || next_code_point_is_katakana))
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continue;
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auto code_point_is_ri = has_any_wbp(code_point, WBP::Regional_Indicator);
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current_ri_chain = code_point_is_ri ? current_ri_chain + 1 : 0;
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// WB15, WB16
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if (code_point_is_ri && has_any_wbp(next_code_point, WBP::Regional_Indicator) && current_ri_chain % 2 == 1)
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continue;
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// WB999
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boundaries.append(view.code_unit_offset_of(it));
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}
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}
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// WB2
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boundaries.append(view.length_in_code_units());
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return boundaries;
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#else
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return {};
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#endif
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}
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}
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@ -45,5 +45,6 @@ bool code_point_has_word_break_property(u32 code_point, WordBreakProperty proper
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bool code_point_has_sentence_break_property(u32 code_point, SentenceBreakProperty property);
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Vector<size_t> find_grapheme_segmentation_boundaries(Utf16View const&);
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Vector<size_t> find_word_segmentation_boundaries(Utf16View const&);
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}
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