// © 2018 and later: Unicode, Inc. and others.

// License & terms of use: http://www.unicode.org/copyright.html

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#ifndef __SOURCE_NUMPARSE_COMPOSITIONS__

#define __SOURCE_NUMPARSE_COMPOSITIONS__

#include "numparse_types.h"

U_NAMESPACE_BEGIN

// Export an explicit template instantiation of the MaybeStackArray that is used as a data member of ArraySeriesMatcher.

// When building DLLs for Windows this is required even though no direct access to the MaybeStackArray leaks out of the i18n library.

// (See digitlst.h, pluralaffix.h, datefmt.h, and others for similar examples.)

#if U_PF_WINDOWS <= U_PLATFORM && U_PLATFORM <= U_PF_CYGWIN

template class U_I18N_API MaybeStackArray<const numparse::impl::NumberParseMatcher*, 3>;

#endif

namespace numparse {

namespace impl {

/**

 * Base class for AnyMatcher and SeriesMatcher.

 */

// Exported as U_I18N_API for tests

class U_I18N_API CompositionMatcher : public NumberParseMatcher {

  protected:

    // No construction except by subclasses!

    CompositionMatcher() = default;

    // To be overridden by subclasses (used for iteration):

    virtual const NumberParseMatcher* const* begin() const = 0;

    // To be overridden by subclasses (used for iteration):

    virtual const NumberParseMatcher* const* end() const = 0;

};

// NOTE: AnyMatcher is no longer being used. The previous definition is shown below.

// The implementation can be found in SVN source control, deleted around March 30, 2018.

///**

// * Composes a number of matchers, and succeeds if any of the matchers succeed. Always greedily chooses

// * the first matcher in the list to succeed.

// *

// * NOTE: In C++, this is a base class, unlike ICU4J, which uses a factory-style interface.

// *

// * @author sffc

// * @see SeriesMatcher

// */

//class AnyMatcher : public CompositionMatcher {

//  public:

//    bool match(StringSegment& segment, ParsedNumber& result, UErrorCode& status) const override;

//

//    bool smokeTest(const StringSegment& segment) const override;

//

//    void postProcess(ParsedNumber& result) const override;

//

//  protected:

//    // No construction except by subclasses!

//    AnyMatcher() = default;

//};

/**

 * Composes a number of matchers, running one after another. Matches the input string only if all of the

 * matchers in the series succeed. Performs greedy matches within the context of the series.

 *

 * @author sffc

 * @see AnyMatcher

 */

// Exported as U_I18N_API for tests

class U_I18N_API SeriesMatcher : public CompositionMatcher {

  public:

    bool match(StringSegment& segment, ParsedNumber& result, UErrorCode& status) const override;

    bool smokeTest(const StringSegment& segment) const override;

    void postProcess(ParsedNumber& result) const override;

    virtual int32_t length() const = 0;

  protected:

    // No construction except by subclasses!

    SeriesMatcher() = default;

};

/**

 * An implementation of SeriesMatcher that references an array of matchers.

 *

 * The object adopts the array, but NOT the matchers contained inside the array.

 */

// Exported as U_I18N_API for tests

class U_I18N_API ArraySeriesMatcher : public SeriesMatcher {

  public:

    ArraySeriesMatcher();  // WARNING: Leaves the object in an unusable state

    typedef MaybeStackArray<const NumberParseMatcher*, 3> MatcherArray;

    /** The array is std::move'd */

    ArraySeriesMatcher(MatcherArray& matchers, int32_t matchersLen);

    UnicodeString toString() const override;

    int32_t length() const override;

  protected:

    const NumberParseMatcher* const* begin() const override;

    const NumberParseMatcher* const* end() const override;

  private:

    MatcherArray fMatchers;

    int32_t fMatchersLen;

};

} // namespace impl

} // namespace numparse

U_NAMESPACE_END

#endif //__SOURCE_NUMPARSE_COMPOSITIONS__

#endif /* #if !UCONFIG_NO_FORMATTING */