/// <summary>
/// Add a Lex item, and Lex with this order.
/// </summary>
/// <param name="name">Name of item</param>
/// <param name="regExpr">Regular Expression of Lex, and automately add "^" at head</param>
/// <param name="regexOptions">Regular Expression Options</param>
/// <param name="formatCapTextDelegate">The delegate of formatting the result of regExpr</param>
/// <param name="group">LexGroup for advanced usage</param>
/// <exception cref="GroupNumException">if Lex group number is out of limite or under zero</exception>
public void AddLexItem(string name, string regExpr, FormatCapTextDelegate formatCapTextDelegate = null, RegexOptions regexOptions = RegexOptions.None, int group = 0)
{
if (name.Length == 0)
{
return;
}
if (regExpr.Length == 0)
{
return;
}
LexItem LexItem = new LexItem(name, formatCapTextDelegate);
if (!regExpr.StartsWith('^'))
{
regExpr = '^' + regExpr; // reg expr must start from head of string
}
LexItem.SetRegex(regExpr, regexOptions);
if (group >= LexGroupCount || group < 0)
{
throw new GroupNumException(group, "AddLexItem Error: illeagal Lex group number: " + group);
}
LexItems[group].Add(LexItem);
}
