public virtual void SpecialChar(RegexPatternMaker maker, char c)
{
}
// Static members
public void EscapeAndAppend(RegexPatternMaker maker, char c)
{
maker._stringBuilder.Append(Regex.Escape(c.ToString()));
}
public virtual void Space(RegexPatternMaker maker, char c)
{
}
public override void SpecialChar(RegexPatternMaker maker, char c)
{
maker._stringBuilder.Append(@"\s*");
EscapeAndAppend(maker, c);
}
public virtual void Abc(RegexPatternMaker maker, char c)
{
}
public override void Space(RegexPatternMaker maker, char c)
{
}
public override void Abc(RegexPatternMaker maker, char c)
{
maker._stringBuilder.Append(@"\s*");
EscapeAndAppend(maker, c);
maker._state = maker._abcState;
}
public override void Space(RegexPatternMaker maker, char c)
{
maker._state = maker._spaceState;
}
public override void Abc(RegexPatternMaker maker, char c)
{
EscapeAndAppend(maker, c);
}
public static string GetRegexPattern(string text)
{
if (null == text) throw new ArgumentNullException();
if (string.IsNullOrEmpty(text)) throw new ArgumentException();
var maker = new RegexPatternMaker(text);
var queue = new Queue<char>(text);
while (0 < queue.Count())
{
var c = queue.Dequeue();
if (char.IsWhiteSpace(c))
{
if (null == maker._state)
{
maker._state = maker._spaceState;
}
maker._state.Space(maker, c);
}
else if (IsSpecialChar(c))
{
if (null == maker._state)
{
maker._state = maker._specialCharState;
}
maker._state.SpecialChar(maker, c);
}
else
{
if (null == maker._state)
{
maker._state = maker._abcState;
}
maker._state.Abc(maker, c);
}
}
return maker._stringBuilder.ToString();
}
