Method eval_boolean

contrib/pugixml/src/pugixml.cpp:10861–10999

		}

		bool eval_boolean(const xpath_context& c, const xpath_stack& stack)
		{
			switch (_type)
			{
			case ast_op_or:
				return _left->eval_boolean(c, stack) || _right->eval_boolean(c, stack);

			case ast_op_and:
				return _left->eval_boolean(c, stack) && _right->eval_boolean(c, stack);

			case ast_op_equal:
				return compare_eq(_left, _right, c, stack, equal_to());

			case ast_op_not_equal:
				return compare_eq(_left, _right, c, stack, not_equal_to());

			case ast_op_less:
				return compare_rel(_left, _right, c, stack, less());

			case ast_op_greater:
				return compare_rel(_right, _left, c, stack, less());

			case ast_op_less_or_equal:
				return compare_rel(_left, _right, c, stack, less_equal());

			case ast_op_greater_or_equal:
				return compare_rel(_right, _left, c, stack, less_equal());

			case ast_func_starts_with:
			{
				xpath_allocator_capture cr(stack.result);

				xpath_string lr = _left->eval_string(c, stack);
				xpath_string rr = _right->eval_string(c, stack);

				return starts_with(lr.c_str(), rr.c_str());
			}

			case ast_func_contains:
			{
				xpath_allocator_capture cr(stack.result);

				xpath_string lr = _left->eval_string(c, stack);
				xpath_string rr = _right->eval_string(c, stack);

				return find_substring(lr.c_str(), rr.c_str()) != nullptr;
			}

			case ast_func_boolean:
				return _left->eval_boolean(c, stack);

			case ast_func_not:
				return !_left->eval_boolean(c, stack);

			case ast_func_true:
				return true;

			case ast_func_false: