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The Tor Browser
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number_usageprefs.h (3288B)

      1 // © 2020 and later: Unicode, Inc. and others.
      2 // License & terms of use: http://www.unicode.org/copyright.html
      3 
      4 #include "unicode/utypes.h"
      5 
      6 #if !UCONFIG_NO_FORMATTING
      7 #ifndef __NUMBER_USAGEPREFS_H__
      8 #define __NUMBER_USAGEPREFS_H__
      9 
     10 #include "cmemory.h"
     11 #include "number_types.h"
     12 #include "unicode/listformatter.h"
     13 #include "unicode/localpointer.h"
     14 #include "unicode/locid.h"
     15 #include "unicode/measunit.h"
     16 #include "unicode/stringpiece.h"
     17 #include "unicode/uobject.h"
     18 #include "units_converter.h"
     19 #include "units_router.h"
     20 
     21 U_NAMESPACE_BEGIN
     22 
     23 using ::icu::units::ComplexUnitsConverter;
     24 using ::icu::units::UnitsRouter;
     25 
     26 namespace number::impl {
     27 
     28 /**
     29 * A MicroPropsGenerator which uses UnitsRouter to produce output converted to a
     30 * MeasureUnit appropriate for a particular localized usage: see
     31 * NumberFormatterSettings::usage().
     32 */
     33 class UsagePrefsHandler : public MicroPropsGenerator, public UMemory {
     34  public:
     35    UsagePrefsHandler(const Locale &locale, const MeasureUnit &inputUnit, const StringPiece usage,
     36                      const MicroPropsGenerator *parent, UErrorCode &status);
     37 
     38    /**
     39     * Obtains the appropriate output value, MeasureUnit and
     40     * rounding/precision behaviour from the UnitsRouter.
     41     *
     42     * The output unit is passed on to the LongNameHandler via
     43     * micros.outputUnit.
     44     */
     45    void processQuantity(DecimalQuantity &quantity, MicroProps &micros,
     46                         UErrorCode &status) const override;
     47 
     48    /**
     49     * Returns the list of possible output units, i.e. the full set of
     50     * preferences, for the localized, usage-specific unit preferences.
     51     *
     52     * The returned pointer should be valid for the lifetime of the
     53     * UsagePrefsHandler instance.
     54     */
     55    const MaybeStackVector<MeasureUnit> *getOutputUnits() const {
     56        return fUnitsRouter.getOutputUnits();
     57    }
     58 
     59  private:
     60    UnitsRouter fUnitsRouter;
     61    const MicroPropsGenerator *fParent;
     62 };
     63 
     64 /**
     65 * A MicroPropsGenerator which converts a measurement from one MeasureUnit to
     66 * another. In particular, the output MeasureUnit may be a mixed unit. (The
     67 * input unit may not be a mixed unit.)
     68 */
     69 class UnitConversionHandler : public MicroPropsGenerator, public UMemory {
     70  public:
     71    /**
     72     * Constructor.
     73     *
     74     * @param targetUnit Specifies the output MeasureUnit. The input MeasureUnit
     75     *     is derived from it: in case of a mixed unit, the biggest unit is
     76     *     taken as the input unit. If not a mixed unit, the input unit will be
     77     *     the same as the output unit and no unit conversion takes place.
     78     * @param parent The parent MicroPropsGenerator.
     79     * @param status Receives status.
     80     */
     81    UnitConversionHandler(const MeasureUnit &targetUnit, const MicroPropsGenerator *parent,
     82                          UErrorCode &status);
     83 
     84    /**
     85     * Obtains the appropriate output values from the Unit Converter.
     86     */
     87    void processQuantity(DecimalQuantity &quantity, MicroProps &micros,
     88                         UErrorCode &status) const override;
     89  private:
     90    MeasureUnit fOutputUnit;
     91    LocalPointer<ComplexUnitsConverter> fUnitConverter;
     92    const MicroPropsGenerator *fParent;
     93 };
     94 
     95 } // namespace number::impl
     96 
     97 U_NAMESPACE_END
     98 
     99 #endif // __NUMBER_USAGEPREFS_H__
    100 #endif /* #if !UCONFIG_NO_FORMATTING */