/// <summary>
/// Inputs a character into this FSA and causes it to change state.
/// </summary>
/// <param name="cFood">The input character.</param>
public void Feed(char cFood)
{
string sInput;
//handle special cases like $d = all digits
if (IsDigit(cFood))
{
sInput = C_DIGIT_INDICATOR;
}
else if (IsLetter(cFood))
{
sInput = C_LETTER_INDICATOR;
}
else if (IsSpace(cFood))
{
sInput = C_SPACE_INDICATOR;
}
else if (cFood == '\r')
{
sInput = C_CARRIAGE_RETURN_INDICATOR;
}
else if (cFood == '\n')
{
sInput = C_LINEFEED_INDICATOR;
}
else if (cFood == '\"')
{
sInput = C_DBL_QUOTE_INDICATOR;
}
else if (cFood == '\'')
{
sInput = C_SGL_QUOTE_INDICATOR;
}
else if (cFood == ',')
{
sInput = C_COMMA_INDICATOR;
}
else if (cFood == '\t')
{
sInput = C_TAB_INDICATOR;
}
else
{
sInput = cFood.ToString(); //otherwise, just use character
}
//if the input character cannot be found in the current state's state table,
//treat it as general punctuation
if (!m_stCurrentState.InputStates.ContainsKey(sInput))
{
sInput = C_PUNCTUATION_INDICATOR;
}
//remember last state, get current state, determine if a back up is needed
m_stLastState = m_stCurrentState;
m_stCurrentState = m_lfsAllStates[((int)m_stCurrentState.InputStates[sInput])];
bBackUp = m_stCurrentState.BackUp;
}
/// <summary>
/// Loads a CSV state table from a stream.
/// </summary>
/// <param name="srInputReader">The stream to read the state table from.</param>
/// <returns>Returns an FSA containing states built from the given stream.</returns>
public static FSA FromStream(StreamReader srInputReader)
{
FSA fsaFinal = new FSA();
string[] saStates = srInputReader.ReadLine().Split(FSAState.c_acSplitters);
while (!srInputReader.EndOfStream)
{
fsaFinal.m_lfsAllStates.Add(FSAState.FromString(srInputReader.ReadLine(), saStates));
}
srInputReader.Close();
return(fsaFinal);
}
/// <summary>
/// Builds a state from a string and returns it.
/// </summary>
/// <param name="sStateStr">The string to use when constructing the FSAState.</param>
/// <returns>Returns a new FSAState containing the information found in the specified string.</returns>
public static FSAState FromString(string sStateStr, string[] saStates)
{
FSAState fsasFinal = new FSAState();
string[] saParts = sStateStr.Split(c_acSplitters);
fsasFinal.m_sDescription = saParts[0];
fsasFinal.m_bAccepting = saParts[1].Contains("#");
for (int i = 2; i < saParts.Length - 1; i++)
{
fsasFinal.m_htInputStates.Add(saStates[i], Int32.Parse(saParts[i]) - 1); //-1 because array starts at 0
}
fsasFinal.m_bBackUp = (saParts[saParts.Length - 1] == "y");
//return the completed state
return(fsasFinal);
}
public void FeedEOF()
{
m_stLastState = m_stCurrentState;
m_stCurrentState = m_lfsAllStates[((int)m_stCurrentState.InputStates[C_EOF_INDICATOR])];
bBackUp = m_stCurrentState.BackUp;
}
/// <summary>
/// Resets this FSA to its starting state.
/// </summary>
public void Reset()
{
m_stCurrentState = m_lfsAllStates[0];
bBackUp = false;
}
/// <summary>
/// Constructor. Makes a new FSA and initializes the current state to null.
/// </summary>
public FSA()
{
m_stCurrentState = null;
m_lfsAllStates = new List <FSAState>();
m_stLastState = null;
}
/// <summary>
/// Inputs a character into this FSA and causes it to change state.
/// </summary>
/// <param name="cFood">The input character.</param>
public void Feed(char cFood)
{
string sInput;
//handle special cases like $d = all digits
if (IsDigit(cFood))
sInput = C_DIGIT_INDICATOR;
else if (IsLetter(cFood))
sInput = C_LETTER_INDICATOR;
else if (IsSpace(cFood))
sInput = C_SPACE_INDICATOR;
else if (cFood == '\r')
sInput = C_CARRIAGE_RETURN_INDICATOR;
else if (cFood == '\n')
sInput = C_LINEFEED_INDICATOR;
else if (cFood == '\"')
sInput = C_DBL_QUOTE_INDICATOR;
else if (cFood == '\'')
sInput = C_SGL_QUOTE_INDICATOR;
else if (cFood == ',')
sInput = C_COMMA_INDICATOR;
else if (cFood == '\t')
sInput = C_TAB_INDICATOR;
else
sInput = cFood.ToString(); //otherwise, just use character
//if the input character cannot be found in the current state's state table,
//treat it as general punctuation
if (! m_stCurrentState.InputStates.ContainsKey(sInput))
sInput = C_PUNCTUATION_INDICATOR;
//remember last state, get current state, determine if a back up is needed
m_stLastState = m_stCurrentState;
m_stCurrentState = m_lfsAllStates[((int)m_stCurrentState.InputStates[sInput])];
bBackUp = m_stCurrentState.BackUp;
}
public void FeedEOF()
{
m_stLastState = m_stCurrentState;
m_stCurrentState = m_lfsAllStates[((int)m_stCurrentState.InputStates[C_EOF_INDICATOR])];
bBackUp = m_stCurrentState.BackUp;
}
/// <summary>
/// Resets this FSA to its starting state.
/// </summary>
public void Reset()
{
m_stCurrentState = m_lfsAllStates[0];
bBackUp = false;
}
/// <summary>
/// Constructor. Makes a new FSA and initializes the current state to null.
/// </summary>
public FSA()
{
m_stCurrentState = null;
m_lfsAllStates = new List<FSAState>();
m_stLastState = null;
}
/// <summary>
/// Builds a state from a string and returns it.
/// </summary>
/// <param name="sStateStr">The string to use when constructing the FSAState.</param>
/// <returns>Returns a new FSAState containing the information found in the specified string.</returns>
public static FSAState FromString(string sStateStr, string[] saStates)
{
FSAState fsasFinal = new FSAState();
string[] saParts = sStateStr.Split(c_acSplitters);
fsasFinal.m_sDescription = saParts[0];
fsasFinal.m_bAccepting = saParts[1].Contains("#");
for (int i = 2; i < saParts.Length - 1; i++)
fsasFinal.m_htInputStates.Add(saStates[i], Int32.Parse(saParts[i]) - 1); //-1 because array starts at 0
fsasFinal.m_bBackUp = (saParts[saParts.Length - 1] == "y");
//return the completed state
return fsasFinal;
}
