ParamData.dart

import './isEmpty.dart';

/// 序列化字符串，参照以前JS写的ParamData
String paramData (Map data) {
  String res = '';
  void addOne (String key, dynamic item) {
    if(item is Function) {
      item = item();
    } else if(isEmpty(item)) {
      item = '';
    } else {
      item = item.toString();
    }
    res = res + (isEmpty(res) ? '' : '&') + Uri.encodeComponent(key) + '=' + Uri.encodeComponent(item);
  }

  void buildParam (String prefix, dynamic item) {
    if(prefix != '') {
      if(item is List) {
        for(var index = 0; index < item.length; index++) {
          buildParam('$prefix[${item[index] is Map && item[index] ? index : ''}]', item[index]);
        }
      } else if(item is Map) {
        item.forEach((key, val){
          buildParam(prefix + '[' + key + ']', item[key]);
        });
      } else {
        addOne(prefix, item);
      }
    } else if(item is Map) {
      item.forEach((key, val){
        buildParam(key, val);
      });
    }
  }

  buildParam('', data);
  return res;
}