/// <summary>
/// Converts a char first into a symbol and then into a regular expression.
/// This is usually trivial appart from ambiguity symbols, such as "R" within
/// the DNA alphabet. They are represented as an alternative, <para></para>e.g. "[AG]
/// to express the ambiguity.
/// </summary>
/// <param name="ch">Character to convert.</param>
/// <param name="alphabet">Alphabet the character belongs to.</param>
/// <returns>Returns the converted character.</returns>
public String Convert(char ch, Alphabet alphabet)
{
if (alphabet.IsValid(ch))
{
Symbol sym = alphabet[ch];
if (sym is SymbolMeta)
{
StringBuilder sb = new StringBuilder();
sb.Append('[');
for (int i = 0; i < ((SymbolMeta)sym).SymbolNumber; i++)
sb.Append(((SymbolMeta)sym)[i].Letter);
sb.Append(']');
return sb.ToString();
}
return "" + sym.Letter;
}
return "" + ch;
}
