buffersearch.cpp

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#include "./buffersearch.h"
 
using namespace std;
 
namespace CppUtilities {


const std::string_view::value_type *BufferSearch::process(const std::string_view::value_type *buffer, std::size_t bufferSize)
{
    if (m_hasResult || (!m_giveUpTerm.empty() && m_giveUpTermIterator == m_giveUpTerm.end())) {
        return nullptr;
    }
    for (auto i = buffer, end = buffer + bufferSize; i != end; ++i) {
        const auto currentChar = *i;
        if (m_searchTermIterator == m_searchTerm.end()) {
            if (m_terminationChars.empty()) {
                m_hasResult = true;
            } else {
                for (const auto &terminationChar : m_terminationChars) {
                    if (currentChar == terminationChar) {
                        m_hasResult = true;
                        break;
                    }
                }
            }
            if (m_hasResult) {
                if (m_callback) {
                    m_callback(*this, std::move(m_result));
                }
                return i;
            }
            m_result += currentChar;
            continue;
        }
        if (currentChar == *m_searchTermIterator) {
            ++m_searchTermIterator;
        } else {
            m_searchTermIterator = m_searchTerm.begin();
        }
        if (m_giveUpTerm.empty()) {
            continue;
        }
        if (currentChar == *m_giveUpTermIterator) {
            ++m_giveUpTermIterator;
        } else {
            m_giveUpTermIterator = m_giveUpTerm.begin();
        }
    }
    return nullptr;
}

void BufferSearch::operator()(const std::string_view::value_type *buffer, std::size_t bufferSize)
{
    process(buffer, bufferSize);
}

void BufferSearch::reset()
{
    m_searchTermIterator = m_searchTerm.begin();
    m_giveUpTermIterator = m_giveUpTerm.begin();
    m_terminationTermIterator = m_terminationTerm.begin();
    m_hasResult = false;
    m_result.clear();
}
 
} // namespace CppUtilities