protected string DecodeLine(string verse)
{
List<string> descriptors = new List<string>();
string result = null;
int bracketIndex = verse.IndexOf('{');
int elementNumber = 0;
int closingBracket = 0;
if (bracketIndex >= 0)
{
StringBuilder sb = new StringBuilder();
sb.Append(verse.Substring(closingBracket, bracketIndex - closingBracket));
while (bracketIndex >= 0)
{
closingBracket = verse.IndexOf('}', bracketIndex + 1);
if (closingBracket < 0)
return null; //syntax error
// try finding valid word
string code = verse.Substring(bracketIndex + 1, closingBracket - bracketIndex - 1);
descriptors.Add(code);
sb.Append("{" + elementNumber + "}");
elementNumber++;
bracketIndex = verse.IndexOf('{', closingBracket + 1);
if (bracketIndex >= 0)
sb.Append(verse.Substring(closingBracket + 1, bracketIndex - closingBracket - 1));
else
sb.Append(verse.Substring(closingBracket + 1));
}
//syntax error (note that there is no way to display brackets in text this way
result = sb.ToString();
}
else
{
return verse; // no placeholders
}
// now decoding...
string[] results = new string[descriptors.Count];
Dictionary<int, GroupInfo> groups = new Dictionary<int, GroupInfo>();
for (int i = 0; i < descriptors.Count; i++)
{
string code = descriptors[i];
// check group
int index = code.IndexOf(':');
if (index >= 0)
{
// this is group
string groupStr = code.Substring(0, index);
int groupNumber = -1;
if (!int.TryParse(groupStr, out groupNumber))
{
results[i] = "{INVALID_GROUP_FORMATTER}";
}
else
{
GroupInfo info = null;
if (groups.ContainsKey(groupNumber))
info = groups[groupNumber];
else
{
info = new GroupInfo(groupNumber);
groups.Add(groupNumber, info);
}
info.AddCode(i, code.Substring(index + 1));
}
}
else
{
// this is normal word
results[i] = Decode(code);
}
}
// decode groups
foreach (GroupInfo group in groups.Values)
{
bool rzlt = group.Analyze();
foreach (int ind in group.Results.Keys)
{
results[ind] = group.Results[ind];
}
}
return string.Format(result, results);
}