string InnerProcess(string key, IList <string> parentKeys = null)
{
var value = _textRepository.FindValueByKey(key);
if (string.IsNullOrEmpty(value))
{
return(value);
}
if (parentKeys != null)
{
if (parentKeys.Contains(key))
{
parentKeys.Add(key);
throw new InvalidOperationException("Circular key reference found for the key path : " + String.Join(" > ", parentKeys));
}
parentKeys.Add(key);
}
StringBuilder sb = null;
var start = 0;
const string insertTail = "$(";
while (true)
{
// find start of key - format : $(key)
var keyStart = value.IndexOf(insertTail, start);
if (keyStart == -1)
{
if (sb == null)
{
if (start == 0)
{
return(value);
}
else
{
sb = new StringBuilder();
}
}
sb.Append(value.Substring(start));
return(sb.ToString());
}
var keyEnd = value.IndexOf(')', keyStart);
var nextKeyStart = value.IndexOf(insertTail, keyStart + 2);
if (keyEnd == -1 || (nextKeyStart != -1 && nextKeyStart < keyEnd))
{
if (sb == null)
{
sb = new StringBuilder();
}
sb.Append(value.Substring(start, keyStart - start + 2));
start = keyStart + 2;
continue;
}
if (sb == null)
{
sb = new StringBuilder();
}
var keyValue = value.Substring(keyStart + 2, keyEnd - keyStart - 2);
var innerValue = this.InnerProcess(keyValue, (parentKeys ?? new List <string> {
key
}).ToList());
if (innerValue == null)
{
// key not found
sb.Append(value.Substring(start, keyEnd - start + 1));
}
else
{
sb.Append(value.Substring(start, keyStart - start));
sb.Append(innerValue);
}
start = keyEnd + 1;
}
}
