/// <summary>为应用解析指定键的值，处理内嵌</summary>
/// <param name="app"></param>
/// <param name="cfg"></param>
/// <param name="scope"></param>
/// <returns></returns>
public String Resolve(App app, ConfigData cfg, String scope)
{
var value = cfg?.Value;
if (value.IsNullOrEmpty())
{
return(value);
}
// 要求内嵌全部解析
var p = 0;
while (true)
{
var p1 = value.IndexOf("${", p);
if (p1 < 0)
{
break;
}
var p2 = value.IndexOf('}', p1 + 2);
if (p2 < 0)
{
break;
}
// 替换
var item = value.Substring(p1 + 2, p2 - p1 - 2);
// 拆分 ${key@app:scope}
var ss = item.Split("@", ":");
var key2 = ss[0];
var app2 = ss.Length > 1 ? ss[1] : "";
var scope2 = ss.Length > 2 ? ss[2] : "";
//item = replace(key, app, scope) + "";
{
var ap2 = App.FindByName(app2);
var scope3 = !scope2.IsNullOrEmpty() ? scope2 : scope;
var cfg2 = ConfigData.Acquire((ap2 ?? app).ID, key2, scope3);
if (cfg2 == null)
{
throw new Exception($"在应用[{app}]的[{cfg.Key}]中无法解析[{item}]");
}
item = Resolve(ap2 ?? app, cfg2, scope3);
}
// 重新组合
var left = value.Substring(0, p1);
var right = value.Substring(p2 + 1);
value = left + item + right;
// 移动游标，加速下一次处理
p = left.Length + item.Length;
}
return(value);
}