public Analyser()
{
TokenTable.InitTable();
ConTable.InitTable();
IdnTable.InitTable();
OutputTokenTable.InitTable();
}
private void AddToIdnTable(ref string token, ref int i)
{
if (OutputTokenTable.Table.Count != 0 && Checker.IsType(OutputTokenTable.Table.Last().Name))
{
if (IdnTable.Contains(token))
{
throw new Exception($"Error on {i + 1} line!\tThe variable '{token}' is already declared.");
}
else
{
IdnTable.Add(token);
}
}
else if (OutputTokenTable.Table.Count != 0 && OutputTokenTable.Table.Last().Name == ",")
{
if (IdnTable.Contains(token))
{
throw new Exception($"Error on {i + 1} line!\tThe variable '{token}' is already declared.");
}
else
{
IdnTable.Add(token);
}
}
else if (!IdnTable.Contains(token) && !TokenTable.Contains(token))
{
throw new Exception($"Error on {i + 1} line!\tThe variable '{token}' wasn't declared.");
}
}
private bool Assignment(ref int i)
{
if (IdnTable.Contains(outputTokens[i].Name))
{
if (!Increment(ref i))
{
return(false);
}
if (outputTokens[i].Name == "=")
{
if (!Increment(ref i))
{
return(false);
}
if (Expression(ref i))
{
return(true);
}
}
}
return(false);
}
private void AddToConTable(ref string token, ref int i)
{
if (OutputTokenTable.Table.Count > 1)
{
string penultimateToken = OutputTokenTable.Table[OutputTokenTable.Table.Count - 2].Name;
if (OutputTokenTable.Table.Last().Name.Equals("=") && IdnTable.Contains(penultimateToken))
{
if (Checker.GetType(token) == IdnTable.GetType(penultimateToken))
{
ConTable.Add(token, IdnTable.GetType(penultimateToken));
}
else
{
throw new Exception($"Error on {i + 1} line!\tInvalid type of constant. Unable to cast " +
$"'{Checker.GetType(token)}' to '{IdnTable.GetType(penultimateToken)}'");
}
}
else if (!ConTable.Contains(token))
{
ConTable.Add(token);
}
}
else if (!ConTable.Contains(token))
{
ConTable.Add(token);
}
}
private bool VariablesList(ref int i)// TODO: by daclarations
{
if (IdnTable.Contains(outputTokens[i].Name))
{
if (!Increment(ref i))
{
return(false);
}
if (outputTokens[i].Name == ",")
{
if (!Increment(ref i))
{
return(false);
}
return(VariablesList(ref i));
}
return(true);
}
else
{
errors.Add(" > Error on " + outputTokens[i].Row + " line!\tExepted name of variable!");
return(false);
}
}
private void CalculateButton_Click(object sender, RoutedEventArgs e)
{
resultTextBox.IsReadOnly = false;
errorsTextBox.IsReadOnly = false;
try
{
if (!string.IsNullOrEmpty(expressionTextBox.Text))
{
LexicalAnalyse.Analyser lexicalAnalyser = new LexicalAnalyse.Analyser();
if (variablesListView.Items.Count > 1)
{
for (int i = 0; i < variablesListView.Items.Count - 1; i++)
{
var ci = new DataGridCellInfo(variablesListView.Items[i], variablesListView.Columns[0]);
var varName = ((Variable)ci.Item).Name;
ci = new DataGridCellInfo(variablesListView.Items[i], variablesListView.Columns[1]);
var varValue = ((Variable)ci.Item).Value.ToString();
IdnTable.Add(varName, Double.Parse(varValue));
}
}
if (lexicalAnalyser.Parse(new string[] { "$ " + expressionTextBox.Text.Trim() + " $" }))
{
RelationshipsTable.InitTable();
OperatorPrecedenceMethod.Analyser syntaxAnalyser = new OperatorPrecedenceMethod.Analyser();
syntaxAnalyser.Parse();
resultTextBox.Text = syntaxAnalyser.GetPolisResult().ToString();
errorsTextBox.Text = syntaxAnalyser.Error;
}
else
{
errorsTextBox.Text = "Lexical error!";
}
resultTextBox.IsReadOnly = true;
errorsTextBox.IsReadOnly = true;
}
else
{
errorsTextBox.Text = "Error! Expression can't be null or empty. Please fill expression form.";
errorsTextBox.IsReadOnly = true;
MessageBox.Show("Error!");
}
}
catch (Exception ex)
{
MessageBox.Show($"ERROR! {ex.Message}");
}
}
public static bool IsAbleToCast(string token)
{
//output tokens is exist and last token in table is "="
return(OutputTokenTable.Table.Count != 0 && OutputTokenTable.Table.Last().Name == "="
//penultimate token is identifier
&& IdnTable.Contains(OutputTokenTable.Table[OutputTokenTable.Table.Count - 2].Name)
//current token is identifier
&& IdnTable.Contains(token)
//types of tokens on both sides of "=" are equal
&& (IdnTable.GetType(token) == IdnTable.GetType(OutputTokenTable.Table[OutputTokenTable.Table.Count - 2].Name)));
}
private string GetLabelOfToken(string token)
{
if (IdnTable.Contains(token))
{
return("id");
}
else if (ConTable.Contains(token))
{
return("con");
}
else
{
return(token);
}
}
private bool Factor(ref int i)
{
if (outputTokens[i].Name == "(")
{
if (!Increment(ref i))
{
return(false);
}
if (Expression(ref i))
{
if (outputTokens[i].Name == ")")
{
if (!Increment(ref i))
{
return(false);
}
return(true);
}
else
{
errors.Add(" > Error on " + outputTokens[i].Row + " line!\tExpected ')'");
}
}
}
if (IdnTable.Contains(outputTokens[i].Name))
{
if (!Increment(ref i))
{
return(false);
}
return(true);
}
if (ConTable.Contains(outputTokens[i].Name))
{
if (!Increment(ref i))
{
return(false);
}
return(true);
}
return(false);
}
private bool Output(ref int i)
{
if (outputTokens[i].Name == "cout")
{
if (!Increment(ref i))
{
return(false);
}
if (outputTokens[i].Name == ">>")
{
if (!Increment(ref i))
{
return(false);
}
if (IdnTable.Contains(outputTokens[i].Name))
{
if (!Increment(ref i))
{
return(false);
}
while ((outputTokens[i].Name == ">>" && outputTokens[i - 1].Name != ">>") || IdnTable.Contains(outputTokens[i].Name))
{
if (!Increment(ref i))
{
return(false);
}
}
return(true);
}
else
{
errors.Add(" > Error on " + outputTokens[i].Row + " line!\tExpected variable!");
}
}
else
{
errors.Add(" > Error on " + outputTokens[i].Row + " line!\tExpected '>>'!");
}
}
return(false);
}
private double GetOperand()
{
if (IdnTable.Contains(stack.Peek()))
{
return((double)IdnTable.GetValue(stack.Pop()));
}
else if (Double.TryParse(stack.Peek(), NumberStyles.Any, CultureInfo.InvariantCulture, out double operand))
{
stack.Pop();
return(operand);
}
else if (new Regex("r\\d+").IsMatch(stack.Peek()))
{
return(cycleDesignations[stack.Pop()]);
}
throw new NotImplementedException();
}
private void ExecuteIO(string operand, string @operator)
{
switch (@operator)
{
case ">>":
string outputValue = string.Empty;
if (IdnTable.Contains(operand))
{
outputValue = IdnTable.GetValue(operand).ToString();
}
else
{
outputValue = "undefined";
}
consoleWindow.consoleContent.ConsoleOutput.Add(outputValue);
break;
case "<<":
consoleWindow.Focus();
var inputWindow = new InputWindow(operand);
inputWindow.ShowDialog();
if (Double.TryParse(inputWindow.inputField.Text, NumberStyles.Any, CultureInfo.InvariantCulture, out double value))
{
IdnTable.SetValue(operand, value);
}
else
{
MessageBox.Show("Invalid value!");
}
break;
default:
throw new InvalidOperationException();
}
}
public void Execute()
{
double secondOperand, firstOperand;
string @operator, lastLabel = string.Empty;
bool jumpFlag = false;
Regex labelRegex = new Regex("l\\d+");
for (int i = 0; i < Generator.Polish.Count; i++)
{
string token = Generator.Polish[i];
if (jumpFlag)
{
if (token == lastLabel)
{
jumpFlag = false;
}
continue;
}
if ((token != "true" && token != "false") && (Checker.IsUnaryOperator(token) || Checker.IsBinaryOperator(token)))
{
if (Checker.IsBinaryOperator(token))
{
@operator = token;
if (Checker.IsOperator(@operator))
{
secondOperand = GetOperand();
firstOperand = GetOperand();
ExecuteExpression(firstOperand, secondOperand, @operator);
AddToViewTable(token, $"{firstOperand} {@operator} {secondOperand}");
}
else if (Checker.IsRelation(@operator))
{
secondOperand = GetOperand();
firstOperand = GetOperand();
ExecuteRelation(firstOperand, secondOperand, @operator);
AddToViewTable(token, $"{firstOperand} {@operator} {secondOperand}");
}
else if (Checker.IsIO(@operator))
{
ExecuteIO(stack.Pop(), @operator);
}
else if (@operator == "=")
{
secondOperand = GetOperand();
string identifierName = stack.Pop();
if (new Regex("r\\d+").IsMatch(identifierName))
{
if (cycleDesignations.FirstOrDefault(r => r.Key == identifierName).Key is null)
{
cycleDesignations.Add(identifierName, secondOperand);
}
else
{
cycleDesignations[identifierName] = secondOperand;
}
}
else
{
IdnTable.SetValue(identifierName, secondOperand);
}
AddToViewTable(token, $"{identifierName} {@operator} {secondOperand}");
}
}
else if (Checker.IsUnaryOperator(token))
{
if (token == "@")
{
string operand = stack.Pop();
if (IdnTable.Contains(operand) && IdnTable.GetValue(operand).HasValue)
{
IdnTable.SetValue(operand, -IdnTable.GetValue(operand).Value);
}
stack.Push($"-{operand}");
AddToViewTable(token, $"Change sign of {operand}");
}
else
{
string identifier;
while (stack.Count > 0)
{
identifier = stack.Pop();
if (IdnTable.GetType(identifier) != token)
{
IdnTable.SetType(identifier, token);
}
}
}
}
}
else if (token.Contains("JNE"))
{
lastLabel = $"{labelRegex.Match(token).Groups[0].Value}:";
bool condition = Boolean.Parse(stack.Pop());
jumpFlag = condition ? false : true;
AddToViewTable(token, $"Jump to label {lastLabel} if last condition is false.");
}
else if (token.Contains("JMP"))
{
string label = labelRegex.Match(token).Groups[0].Value;
i = Generator.LabelsTable[label];
AddToViewTable(token, $"Jump to label {label}:");
}
else if (!token.Contains(":"))
{
stack.Push(token);
AddToViewTable(token, "Add input token to stack");
}
}
}
public bool Parse(string[] programCode)
{
try
{
string token = string.Empty;
for (int i = 0; i < programCode.Length; i++)
{
int j = 0;
foreach (char ch in programCode[i])
{
if (ch.Equals('$'))
{
OutputTokenTable.Add(numRow: i, ch.ToString());
j++;
continue;
}
if (Checker.IsConstant(ch) ||
Checker.IsLetter(ch) ||
(Checker.IsSign(ch) && !string.IsNullOrEmpty(token) && Checker.IsExponent(token.Last())))
{
token += ch;
}
else if (Checker.IsSingleCharacterSeparator(ch) || Checker.IsWhiteSeparator(ch) || Checker.IsPossibleDoubleSeparator(ch))
{
AddToInternalTable(ref token, ref i);
if (ConTable.Contains(token) ||
IdnTable.Contains(token) ||
(TokenTable.Contains(token) && !Checker.IsDoubleSeparator(token + ch)))
{
OutputTokenTable.Add(numRow: i + 1, token);
token = string.Empty;
}
if (Checker.IsPossibleDoubleSeparator(ch))
{
if (!Checker.IsDoubleSeparator(token) &&
Checker.IsDoubleSeparator(ch.ToString()
+ ((programCode[i].Length - 1 != j) ? programCode[i][j + 1].ToString() : string.Empty)))
{
token += ch;
j++;
continue;
}
else
{
OutputTokenTable.Add(numRow: i + 1, token + ch);
token = string.Empty;
}
}
else if (Checker.IsSingleCharacterSeparator(ch))
{
OutputTokenTable.Add(numRow: i + 1, token + ch);
}
}
else
{
throw new Exception($"Error on {i + 1} line!\tUndefined exeption.");
}
j++;
}
}
return(true);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Alert", MessageBoxButton.OK);
return(false);
}
}
private bool Cycle(ref int i)
{
if (outputTokens[i].Name == "for")
{
if (!Increment(ref i))
{
return(false);
}
if (outputTokens[i].Name == "(")
{
if (!Increment(ref i))
{
return(false);
}
if (IdnTable.Contains(outputTokens[i].Name))
{
if (!Increment(ref i))
{
return(false);
}
if (outputTokens[i].Name == "=")
{
if (!Increment(ref i))
{
return(false);
}
if (Expression(ref i))
{
if (outputTokens[i].Name == ";")
{
if (!Increment(ref i))
{
return(false);
}
if (Relation(ref i))
{
if (outputTokens[i].Name == ";")
{
if (!Increment(ref i))
{
return(false);
}
if (Expression(ref i))
{
if (outputTokens[i].Name == ")")
{
if (!Increment(ref i))
{
return(false);
}
if (OperatorBlock(ref i))
{
return(true);
}
return(false);
}
else
{
errors.Add(" > Error on " + outputTokens[i].Row + " line!\tExpected ')'!");
}
}
}
else
{
errors.Add(" > Error on " + outputTokens[i].Row + " line!\tExpected ';'!");
}
}
}
else
{
errors.Add(" > Error on " + outputTokens[i].Row + " line!\tExpected ';'!");
}
}
}
else
{
errors.Add(" > Error on " + outputTokens[i].Row + " line!\tExpected '='!");
}
}
else
{
errors.Add(" > Error on " + outputTokens[i].Row + " line!\tnNot initiated variable!");
}
}
else
{
errors.Add(" > Error on " + outputTokens[i].Row + " line!\tExpected '('!");
}
}
return(false);
}
