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package ucd
import "io"
type UnicodeData struct {
GeneralCategory map[string][]*CodePointRange
propValAliases *PropertyValueAliases
}
// ParseUnicodeData parses the UnicodeData.txt.
func ParseUnicodeData(r io.Reader, propValAliases *PropertyValueAliases) (*UnicodeData, error) {
unicodeData := &UnicodeData{
GeneralCategory: map[string][]*CodePointRange{},
propValAliases: propValAliases,
}
p := newParser(r)
for p.parse() {
if len(p.fields) == 0 {
continue
}
cp, err := p.fields[0].codePointRange()
if err != nil {
return nil, err
}
gc := p.fields[2].normalizedSymbol()
unicodeData.addGC(gc, cp)
}
if p.err != nil {
return nil, p.err
}
return unicodeData, nil
}
func (u *UnicodeData) addGC(gc string, cp *CodePointRange) {
// https://www.unicode.org/reports/tr44/#Empty_Fields
// > The data file UnicodeData.txt defines many property values in each record. When a field in a data line
// > for a code point is empty, that indicates that the property takes the default value for that code point.
if gc == "" {
return
}
cps, ok := u.GeneralCategory[u.propValAliases.gcAbb(gc)]
if ok {
c := cps[len(cps)-1]
if cp.From-c.To == 1 {
c.To = cp.To
} else {
u.GeneralCategory[u.propValAliases.gcAbb(gc)] = append(cps, cp)
}
} else {
u.GeneralCategory[u.propValAliases.gcAbb(gc)] = []*CodePointRange{cp}
}
}
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