convertJsonFormat static method

String convertJsonFormat(dynamic object, int deep, { bool isObject = false, })

用于json的格式化打印 object 解析的对象 deep 递归的深度，用来获取缩进的空白长度 isObject 用来区分当前map或list是不是来自某个字段，则不用显示缩进。单纯的map或list需要添加缩进

Implementation

static String convertJsonFormat(dynamic object, int deep, {bool isObject = false}) {
  var buffer = StringBuffer();
  var nextDeep = deep + 1;
  if (object is Map) {
    var list = object.keys.toList();
    if (!isObject) {
      //如果map来自某个字段，则不需要显示缩进
      buffer.write("${getDeepSpace(deep)}");
    }
    buffer.write("{");
    if (list.isEmpty) {
      //当map为空，直接返回‘}’
      buffer.write("}");
    } else {
      buffer.write("\n");
      for (int i = 0; i < list.length; i++) {
        buffer.write("${getDeepSpace(nextDeep)}\"${list[i]}\":");
        buffer.write(convertJsonFormat(object[list[i]], nextDeep, isObject: true));
        if (i < list.length - 1) {
          buffer.write(",");
          buffer.write("\n");
        }
      }
      buffer.write("\n");
      buffer.write("${getDeepSpace(deep)}}");
    }
  } else if (object is List) {
    if (!isObject) {
      //如果list来自某个字段，则不需要显示缩进
      buffer.write("${getDeepSpace(deep)}");
    }
    buffer.write("[");
    if (object.isEmpty) {
      //当list为空，直接返回‘]’
      buffer.write("]");
    } else {
      buffer.write("\n");
      for (int i = 0; i < object.length; i++) {
        buffer.write(convertJsonFormat(object[i], nextDeep));
        if (i < object.length - 1) {
          buffer.write(",");
          buffer.write("\n");
        }
      }
      buffer.write("\n");
      buffer.write("${getDeepSpace(deep)}]");
    }
  } else if (object is String) {
    //为字符串时，需要添加双引号并返回当前内容
    buffer.write("\"$object\"");
  } else if (object is num || object is bool) {
    //为数字或者布尔值时，返回当前内容
    buffer.write(object);
  } else {
    //如果对象为空，则返回null字符串
    buffer.write("null");
  }
  return buffer.toString();
}