// © 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

// Allow implicit conversion from char16_t* to UnicodeString for this file:

// Helpful in toString methods and elsewhere.

#define UNISTR_FROM_STRING_EXPLICIT

#include "numparse_types.h"

#include "numparse_compositions.h"

#include "string_segment.h"

#include "unicode/uniset.h"

using namespace icu;

using namespace icu::numparse;

using namespace icu::numparse::impl;

bool SeriesMatcher::match(StringSegment& segment, ParsedNumber& result, UErrorCode& status) const {

    ParsedNumber backup(result);

    int32_t initialOffset = segment.getOffset();

    bool maybeMore = true;

    for (const auto* it = begin(); it < end();) {

        const NumberParseMatcher* matcher = *it;

        int matcherOffset = segment.getOffset();

        if (segment.length() != 0) {

            maybeMore = matcher->match(segment, result, status);

        } else {

            // Nothing for this matcher to match; ask for more.

            maybeMore = true;

        }

        bool success = (segment.getOffset() != matcherOffset);

        bool isFlexible = matcher->isFlexible();

        if (success && isFlexible) {

            // Match succeeded, and this is a flexible matcher. Re-run it.

        } else if (success) {

            // Match succeeded, and this is NOT a flexible matcher. Proceed to the next matcher.

            it++;

            // Small hack: if there is another matcher coming, do not accept trailing weak chars.

            // Needed for proper handling of currency spacing.

            if (it < end() && segment.getOffset() != result.charEnd && result.charEnd > matcherOffset) {

                segment.setOffset(result.charEnd);

            }

        } else if (isFlexible) {

            // Match failed, and this is a flexible matcher. Try again with the next matcher.

            it++;

        } else {

            // Match failed, and this is NOT a flexible matcher. Exit.

            segment.setOffset(initialOffset);

            result = backup;

            return maybeMore;

        }

    }

    // All matchers in the series succeeded.

    return maybeMore;

}

bool SeriesMatcher::smokeTest(const StringSegment& segment) const {

    // NOTE: The range-based for loop calls the virtual begin() and end() methods.

    // NOTE: We only want the first element. Use the for loop for boundary checking.

    for (const auto& matcher : *this) {

        // SeriesMatchers are never allowed to start with a Flexible matcher.

        U_ASSERT(!matcher->isFlexible());

        return matcher->smokeTest(segment);

    }

    return false;

}

void SeriesMatcher::postProcess(ParsedNumber& result) const {

    // NOTE: The range-based for loop calls the virtual begin() and end() methods.

    for (const auto* matcher : *this) {

        matcher->postProcess(result);

    }

}

ArraySeriesMatcher::ArraySeriesMatcher()

        : fMatchersLen(0) {

}

ArraySeriesMatcher::ArraySeriesMatcher(MatcherArray& matchers, int32_t matchersLen)

        : fMatchers(std::move(matchers)), fMatchersLen(matchersLen) {

}

int32_t ArraySeriesMatcher::length() const {

    return fMatchersLen;

}

const NumberParseMatcher* const* ArraySeriesMatcher::begin() const {

    return fMatchers.getAlias();

}

const NumberParseMatcher* const* ArraySeriesMatcher::end() const {

    return fMatchers.getAlias() + fMatchersLen;

}

UnicodeString ArraySeriesMatcher::toString() const {

    return u"<ArraySeries>";

}

#endif /* #if !UCONFIG_NO_FORMATTING */