static bool AssignValue(string VariableName, Node Expression)
{
SymbolValue Result = SymbolTable.Find(sv => sv.Name == VariableName && CurrentScope.Contains(sv.Scope));
if (Result == null)
{
MessageBox.Show("Variable " + VariableName + " Doesn't Exist");
return(false);
}
else
{
if (Result.DataType == Expression.datatype)
{
Result.Value = Expression.value;
}
else if (Result.DataType == Token_Class.Float.ToString() && Expression.datatype == Token_Class.Integer.ToString())
{
Result.Value = Expression.value;
Expression.datatype = Token_Class.Float.ToString();
}
else if (Result.DataType == Token_Class.Integer.ToString() && Expression.datatype == Token_Class.Float.ToString())
{
Result.Value = Expression.value;
Result.DataType = Token_Class.Float.ToString();
}
else
{
//Don't forget..int goes in float !!!!
MessageBox.Show("DataTypes" + Result.DataType + "and" + Expression.datatype + "Missmatch");
return(false);
}
}
return(true);
}
public static bool EvaluateCondition(SymbolValue Right, string Opp, Node Left)
{
bool Result = false;
if (Right.DataType != Left.datatype)
{
MessageBox.Show("Cannot Compare different datatypes");
}
else
{
if (Opp == "=")
{
if (Left.datatype == Token_Class.Integer.ToString())
{
Result = (Convert.ToInt32(Right.Value) == Convert.ToInt32(Left.value));
}
else if (Left.datatype == Token_Class.Float.ToString())
{
Result = (Convert.ToDecimal(Right.Value) == Convert.ToDecimal(Left.value));
}
}
else if (Opp == ">")
{
if (Left.datatype == Token_Class.Integer.ToString())
{
Result = (Convert.ToInt32(Right.Value) > Convert.ToInt32(Left.value));
}
else if (Left.datatype == Token_Class.Float.ToString())
{
Result = (Convert.ToDecimal(Right.Value) > Convert.ToDecimal(Left.value));
}
}
else if (Opp == "<")
{
if (Left.datatype == Token_Class.Integer.ToString())
{
Result = (Convert.ToInt32(Right.Value) < Convert.ToInt32(Left.value));
}
else if (Left.datatype == Token_Class.Float.ToString())
{
Result = (Convert.ToDecimal(Right.Value) < Convert.ToDecimal(Left.value));
}
}
else if (Opp == "<>")
{
if (Left.datatype == Token_Class.Integer.ToString())
{
Result = (Convert.ToInt32(Right.Value) != Convert.ToInt32(Left.value));
}
else if (Left.datatype == Token_Class.Float.ToString())
{
Result = (Convert.ToDecimal(Right.Value) != Convert.ToDecimal(Left.value));
}
}
}
return(Result);
}
public static void HandleDeclerationStatment(Node root)
{
SymbolValue sv = new SymbolValue();
HandleDatatype(root.children[0]);
sv.DataType = root.children[0].datatype;
root.children[1].datatype = root.children[0].datatype;
HandleListIdentifier(root.children[1]);
}
static bool CheckIfDeclared(string VariableName, string ParameterType)
{
SymbolValue Result = SymbolTable.Find(sv => sv.Name == VariableName && CurrentScope.Contains(sv.Scope));
if (Result == null || Result.DataType != ParameterType)
{
MessageBox.Show("Variable" + VariableName + " is not declared");
return(false);
}
return(true);
}
public static void HandleReadStatement(Node root)
{
//root.children[0] read;
string currentVariable = root.children[1].Name;
SymbolValue Result = SymbolTable.Find(sv => sv.Name == currentVariable && CurrentScope.Contains(sv.Scope));
if (Result == null)
{
MessageBox.Show("Variable " + currentVariable + " doesn't exist");
}
else
{
root.value = Result.Value;
root.datatype = Result.DataType;
root.children[1].value = Result.Value;
root.children[1].datatype = Result.DataType;
}
}
public static void HandleZ(Node root)
{
root.children[0].datatype = root.datatype;
if (root.children[0].Name == "AssignmentStatement")
{
HandleExpression(root.children[0].children[2]);
SymbolValue sv = new SymbolValue();
sv.Name = root.children[0].children[0].Name;
sv.DataType = root.children[0].datatype;
sv.Scope = CurrentScope;
sv.Value = "0";//mo2ktan
AddVariable(sv);
HandleAssignmentStatement(root.children[0]);
}
else
{
HandleParameters(root.children[0]);
}
}
public static void HandleParameters(Node root)
{
if (root.children.Count == 0)
{
return;
}
if (root.children.Count == 1)
{
SymbolValue sv = new SymbolValue();
if (root.datatype == Token_Class.Integer.ToString())
{
root.children[0].value = 0;
}
else if (root.datatype == Token_Class.Float.ToString())
{
root.children[0].value = 0.0;
}
else
{
root.children[0].value = "empty";
}
sv.Name = root.children[0].Name;
sv.Value = root.children[0].value;
sv.DataType = root.datatype;
sv.Scope = CurrentScope;
AddVariable(sv);
}
else
{
int start = 0;
if (root.children[0].Name == ",")
{
start = 1;
}
for (int i = start; i < root.children.Count; i++)
{
root.children[i].datatype = root.datatype;
HandleParameters(root.children[i]);
}
}
}
static bool AddVariable(SymbolValue NewSymbolVal)
{
SymbolValue Result = SymbolTable.Find(sv => sv.Name == NewSymbolVal.Name && sv.Scope == NewSymbolVal.Scope);
if (Result != null)
{
if (Result.Scope == NewSymbolVal.Scope)
{
MessageBox.Show("Variable " + Result.Name + " already declared");
return(false);
}
else
{
SymbolTable.Add(NewSymbolVal);
}
}
else
{
SymbolTable.Add(NewSymbolVal);
}
return(true);
}
public static void HandleTerm(Node root)
{
if (root.children[0].Name == "Constant")
{
root.children[0].value = root.children[0].children[0].Name;
if (root.children[0].children[0].Name.Contains("."))
{
root.children[0].datatype = root.children[0].datatype.ToString();
root.children[0].datatype = Token_Class.Float.ToString();
root.children[0].children[0].datatype = Token_Class.Float.ToString();
}
else
{
root.children[0].datatype = root.children[0].datatype.ToString();
root.children[0].datatype = Token_Class.Integer.ToString();
root.children[0].children[0].datatype = Token_Class.Integer.ToString();
}
}
else if (root.children[0].Name == "FunctionCall")
{
HandleFuncCall(root.children[0]);
root.children[0].value = float.MinValue; //default value! Needs If conditions
}
else
{
SymbolValue Result = SymbolTable.Find(sv => sv.Name == root.children[0].Name && CurrentScope.Contains(sv.Scope));
if (Result == null)
{
MessageBox.Show("Variable " + root.children[0].Name + " doesn't exist in " + CurrentScope);
}
else
{
root.children[0].datatype = Result.DataType;
root.children[0].value = Result.Value;
}
}
root.datatype = root.children[0].datatype;
root.value = root.children[0].value;
}
public static void HandleListParameters(Node root, List <string> list)
{
if (root.children.Count == 0)
{
return;
}
if (root.children.Count == 3)
{
HandleDatatype(root.children[0]);
list.Add(root.children[0].datatype);
//root.children[1] ParameterName!
root.children[1].datatype = root.children[0].datatype;
SymbolValue sv = new SymbolValue();
sv.Name = root.children[1].Name;
sv.Scope = CurrentScope;
sv.DataType = root.children[0].datatype;
sv.Value = 0;//mo2ktan
AddVariable(sv);
//ha3ml 7aga b namae el parameter ???
HandleListParameters(root.children[2], list);
}
else
{
//root.children[0] ->"."
HandleDatatype(root.children[1]);
list.Add(root.children[1].datatype);
//root.children[2] ParameterName!
root.children[2].datatype = root.children[1].datatype;
SymbolValue sv = new SymbolValue();
sv.Name = root.children[2].Name;
sv.Scope = CurrentScope;
sv.DataType = root.children[1].datatype;
sv.Value = 0;//mo2ktan
AddVariable(sv);
//ha3ml 7aga b namae el parameter ???
HandleListParameters(root.children[3], list);
}
}
public static void HandleConditionStatment(Node root)
{
bool final;
if (root.children.Count == 0)
{
return;
}
if (root.Name == "ConditionStatementOR")
{
//ConditionOperator root.children[0];
HandleConditionStatment(root.children[1]);
HandleConditionStatment(root.children[2]);
root.value = root.children[1].value;
}
else if (root.Name == "ConditionStatementAnd")
{
//opp
//condtion
string VariableName = root.children[1].children[0].Name;
SymbolValue Result = SymbolTable.Find(sv => sv.Name == VariableName && CurrentScope.Contains(sv.Scope));
if (Result == null)
{
MessageBox.Show("Variable " + VariableName + " doesn't exist in " + CurrentScope);
}
else
{
root.children[1].children[0].value = Result.Value;
root.children[1].children[0].datatype = Result.DataType;
string Opp = root.children[1].children[1].children[0].Name;
HandleTerm(root.children[1].children[2]);
root.children[1].value = EvaluateCondition(Result, Opp, root.children[1].children[2]);
}
//CondStatments
HandleConditionStatment(root.children[2]);
if (root.children[2].children.Count == 0)
{
root.value = root.children[1].value;
}
else
{
root.value = (Convert.ToBoolean(root.children[1].value) && Convert.ToBoolean(root.children[2].value));
}
}
else
{
if (root.children[0].Name == "Condition")
{
//Need to check every find conditions
string VariableName = root.children[0].children[0].Name;
SymbolValue Result = SymbolTable.Find(sv => sv.Name == VariableName && CurrentScope.Contains(sv.Scope));
if (Result == null)
{
MessageBox.Show("Variable " + VariableName + " doesn't exist in " + CurrentScope);
}
else
{
root.children[0].children[0].datatype = Result.DataType;
string Opp = root.children[0].children[1].children[0].Name;
HandleTerm(root.children[0].children[2]);
root.children[0].value = EvaluateCondition(Result, Opp, root.children[0].children[2]);
root.children[0].children[0].value = Result.Value;
}
HandleConditionStatment(root.children[1]);
if (root.children[1].children.Count == 0)
{
root.value = root.children[0].value;
}
else
{
root.value = (Convert.ToBoolean(root.children[0].value) && Convert.ToBoolean(root.children[1].value));
}
}
else
{
HandleConditionStatment(root.children[0]);
}
HandleConditionStatment(root.children[1]);
}
final = Convert.ToBoolean(root.children[0].value) || Convert.ToBoolean(root.children[1].value);
root.value = final;
}
