Class Column

tests/catch.hpp:6384–6548

class Columns;

class Column {
	std::vector<std::string> m_strings;
	size_t m_width = CATCH_CLARA_TEXTFLOW_CONFIG_CONSOLE_WIDTH;
	size_t m_indent = 0;
	size_t m_initialIndent = std::string::npos;

public:
	class iterator {
		friend Column;

		Column const& m_column;
		size_t m_stringIndex = 0;
		size_t m_pos = 0;

		size_t m_len = 0;
		size_t m_end = 0;
		bool m_suffix = false;

		iterator(Column const& column, size_t stringIndex)
			: m_column(column),
			m_stringIndex(stringIndex) {}

		auto line() const -> std::string const& { return m_column.m_strings[m_stringIndex]; }

		auto isBoundary(size_t at) const -> bool {
			assert(at > 0);
			assert(at <= line().size());

			return at == line().size() ||
				(isWhitespace(line()[at]) && !isWhitespace(line()[at - 1])) ||
				isBreakableBefore(line()[at]) ||
				isBreakableAfter(line()[at - 1]);
		}

		void calcLength() {
			assert(m_stringIndex < m_column.m_strings.size());

			m_suffix = false;
			auto width = m_column.m_width - indent();
			m_end = m_pos;
			while (m_end < line().size() && line()[m_end] != '\n')
				++m_end;

			if (m_end < m_pos + width) {
				m_len = m_end - m_pos;
			} else {
				size_t len = width;
				while (len > 0 && !isBoundary(m_pos + len))
					--len;
				while (len > 0 && isWhitespace(line()[m_pos + len - 1]))
					--len;

				if (len > 0) {
					m_len = len;
				} else {
					m_suffix = true;
					m_len = width - 1;
				}