/// <summary>
/// Searches for every symbol from terminal in classes.
/// Modifies existing classes and adds new ones if needed.
/// </summary>
/// <param name="terminal">Terminal to be processed.</param>
/// <returns>SymbolClasses of terminal.</returns>
private List <string> GetClassesOfTerminalSymbols(string terminal)
{
// Dictionary of created or used classes.
List <string> terminalClasses = new List <string>();
// Check each character.
foreach (char ch in terminal)
{
// Get info about symbol.
var symbolInfo = ClassTable.GetSymbolInfo(ch);
// String representation of character.
string stringChar = ch.ToString();
// If symbol is classified then there is a class for it created.
if (symbolInfo.category == SymbolCategory.Classified)
{
// Get symbol class characters.
var classCharacters = ClassTable.SymbolClasses[symbolInfo.@class];
// If there are more then 1 character in the class
// then remove the character from the class and create a new one.
if (classCharacters.Count() > 1)
{
// Find position of the symbol in the class.
int pos = classCharacters.IndexOf(ch);
// Remove the symbol from the class.
ClassTable.SymbolClasses[symbolInfo.@class] = classCharacters.Remove(pos, 1);
// Add symbol as separate terminal to unclassified terminals.
UnclassifiedTerminals = UnclassifiedTerminals.Append(stringChar);
// Create dedicated class.
ClassTable.SymbolClasses[stringChar] = stringChar;
// If classesWithRemovedSymbols does not contain class name then
// must create one.
if (!classesWithRemovedSymbols.ContainsKey(symbolInfo.@class))
{
classesWithRemovedSymbols[symbolInfo.@class] = new List <char>();
}
// Add symbol to list fo removed symbols.
classesWithRemovedSymbols[symbolInfo.@class].Add(ch);
terminalClasses.Add(stringChar);
}
else if (classCharacters.Count() == 1)
{
terminalClasses.Add(symbolInfo.@class);
}
}
else if (symbolInfo.category == SymbolCategory.Undefined)
{
ClassTable.SymbolClasses[stringChar] = stringChar;
terminalClasses.Add(stringChar);
}
}
return(terminalClasses);
}