Method parse_table_header

src/toml.hpp:15232–15454

		TOML_NODISCARD
		TOML_NEVER_INLINE
		table* parse_table_header()
		{
			return_if_error({});
			assert_not_eof();
			TOML_ASSERT_ASSUME(*cp == U'[');
			push_parse_scope("table header"sv);

			const source_position header_begin_pos = cp->position;
			source_position header_end_pos;
			bool is_arr = false;

			// parse header
			{
				// skip first '['
				advance_and_return_if_error_or_eof({});

				// skip past any whitespace that followed the '['
				const bool had_leading_whitespace = consume_leading_whitespace();
				set_error_and_return_if_eof({});

				// skip second '[' (if present)
				if (*cp == U'[')
				{
					if (had_leading_whitespace)
						set_error_and_return_default(
							"[[array-of-table]] brackets must be contiguous (i.e. [ [ this ] ] is prohibited)"sv);

					is_arr = true;
					advance_and_return_if_error_or_eof({});

					// skip past any whitespace that followed the '['
					consume_leading_whitespace();
					set_error_and_return_if_eof({});
				}

				// check for a premature closing ']'
				if (*cp == U']')
					set_error_and_return_default("tables with blank bare keys are explicitly prohibited"sv);

				// get the actual key
				start_recording();
				parse_key();
				stop_recording(1u);
				return_if_error({});

				// skip past any whitespace that followed the key
				consume_leading_whitespace();
				return_if_error({});
				set_error_and_return_if_eof({});

				// consume the closing ']'
				if (*cp != U']')
					set_error_and_return_default("expected ']', saw '"sv, to_sv(*cp), "'"sv);
				if (is_arr)
				{
					advance_and_return_if_error_or_eof({});
					if (*cp != U']')
						set_error_and_return_default("expected ']', saw '"sv, to_sv(*cp), "'"sv);