Function IsColourSafe

src/strings.cpp:1081–1095

* Test if a string contains colour codes, and is not wrapped by push/pop codes. * @param buffer String to test. * @return True iff the string is colour safe. */

 * @return True iff the string is colour safe.
 */
static bool IsColourSafe(std::string_view buffer)
{
	int safety = 0;
	for (char32_t ch : Utf8View(buffer)) {
		if (ch == SCC_PUSH_COLOUR) {
			++safety;
		} else if (ch == SCC_POP_COLOUR) {
			--safety;
			if (safety < 0) return false;
		} else if ((ch >= SCC_BLUE && ch <= SCC_BLACK) || ch == SCC_COLOUR) {
			if (safety == 0) return false;
		}
	}
	return true;
}

/**
 * Parse most format codes within a string and write the result to a buffer.