Method eval_number

external/pugixml/pugixml.cpp:7532–7667

		}

		double eval_number(const xpath_context& c, const xpath_stack& stack)
		{
			switch (_type)
			{
			case ast_op_add:
				return _left->eval_number(c, stack) + _right->eval_number(c, stack);
				
			case ast_op_subtract:
				return _left->eval_number(c, stack) - _right->eval_number(c, stack);

			case ast_op_multiply:
				return _left->eval_number(c, stack) * _right->eval_number(c, stack);

			case ast_op_divide:
				return _left->eval_number(c, stack) / _right->eval_number(c, stack);

			case ast_op_mod:
				return fmod(_left->eval_number(c, stack), _right->eval_number(c, stack));

			case ast_op_negate:
				return -_left->eval_number(c, stack);

			case ast_number_constant:
				return _data.number;

			case ast_func_last:
				return (double)c.size;
			
			case ast_func_position:
				return (double)c.position;

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

				return (double)_left->eval_node_set(c, stack).size();
			}
			
			case ast_func_string_length_0:
			{
				xpath_allocator_capture cr(stack.result);

				return (double)string_value(c.n, stack.result).length();
			}
			
			case ast_func_string_length_1:
			{
				xpath_allocator_capture cr(stack.result);

				return (double)_left->eval_string(c, stack).length();
			}
			
			case ast_func_number_0:
			{
				xpath_allocator_capture cr(stack.result);

				return convert_string_to_number(string_value(c.n, stack.result).c_str());
			}