/// <summary>
/// Generates all subset <see cref="WordStructure"/> combinations of the <see cref="WordStructure"/> passed in.
/// </summary>
/// <param name="instr"></param>
/// <param name="outstr"></param>
private void GetCombinations(WordStructure instr, List <WordStructure> outstr)
{
var comps = instr.Components.ToList();
for (int i = 0; i < comps.Count(); i++)
{
WordStructureComponent wsc = instr.Components[i];
if (wsc.IsOptional)
{
comps.RemoveAt(i);
var str = new WordStructure(comps.ToArray());
outstr.Add(str);
GetCombinations(str, outstr);
comps.Insert(i, wsc);
}
}
}
/// <summary>
/// Parses a string into a <see cref="WordStructure"/> object.
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static WordStructure Parse(string str)
{
if (string.IsNullOrEmpty(str))
{
throw new ArgumentNullException("str");
}
WordStructure structure = new WordStructure();
bool isOptional = false;
for (int i = 0; i < str.Length; i++)
{
var character = str.ElementAt(i);
// check for special characters.
switch (character)
{
case ParserSymbols.OPTIONAL_START:
isOptional = true;
continue;
case ParserSymbols.OPTIONAL_END:
isOptional = false;
continue;
}
// build the component.
WordStructureComponent component = new WordStructureComponent
{
IsOptional = isOptional,
Symbol = character
};
structure.Components.Add(component);
}
return(structure);
}
