/// <summary>
/// Moves the current scope back to its parent scope
/// </summary>
public static void ParentScope()
{
CurrentScope = CurrentScope.ParentScope;
}
/// <summary>
/// Setup database with default types and operators
/// </summary>
public static void Setup()
{
GlobalScope.Id = "_";
GlobalScope.ParentScope = null;
CurrentScope = GlobalScope;
//Setup default types
Types = new List<TypeInfo>();
Types.Add(new TypeInfo() { Name = "INT" });
Types.Add(new TypeInfo() { Name = "CHAR" });
Types.Add(new TypeInfo() { Name = "FLOAT" });
Types.Add(new TypeInfo() { Name = "BOOL" });
Types.Add(new TypeInfo() { Name = "DOUBLE" });
Types.Add(new TypeInfo() { Name = "VOID" });
Types.Add(new TypeInfo() { Name = "STRING" });
//Operators
Operators = new List<OperatorInfo>();
Operators.Add(new OperatorInfo("+", false, GetType("DOUBLE"), GetType("DOUBLE"), GetType("DOUBLE"), 4));
Operators.Add(new OperatorInfo("-", false, GetType("DOUBLE"), GetType("DOUBLE"), GetType("DOUBLE"), 4));
Operators.Add(new OperatorInfo("*", false, GetType("DOUBLE"), GetType("DOUBLE"), GetType("DOUBLE"), 5));
Operators.Add(new OperatorInfo("/", false, GetType("DOUBLE"), GetType("DOUBLE"), GetType("DOUBLE"), 4));
Operators.Add(new OperatorInfo("<", false, GetType("DOUBLE"), GetType("DOUBLE"), GetType("BOOL"), 3));
Operators.Add(new OperatorInfo(">", false, GetType("DOUBLE"), GetType("DOUBLE"), GetType("BOOL"), 3));
Operators.Add(new OperatorInfo("<=", false, GetType("DOUBLE"), GetType("DOUBLE"), GetType("BOOL"), 3));
Operators.Add(new OperatorInfo(">=", false, GetType("DOUBLE"), GetType("DOUBLE"), GetType("BOOL"), 3));
Operators.Add(new OperatorInfo("!=", false, GetType("DOUBLE"), GetType("DOUBLE"), GetType("BOOL"), 3));
Operators.Add(new OperatorInfo("==", false, GetType("BOOL"), GetType("BOOL"), GetType("BOOL"), 3));
Operators.Add(new OperatorInfo("==", false, GetType("DOUBLE"), GetType("DOUBLE"), GetType("BOOL"), 3));
Operators.Add(new OperatorInfo("&&", false, GetType("BOOL"), GetType("BOOL"), GetType("BOOL"), 2));
Operators.Add(new OperatorInfo("||", false, GetType("BOOL"), GetType("BOOL"), GetType("BOOL"), 2));
Operators.Add(new OperatorInfo("!", true, GetType("VOID"), GetType("BOOL"), GetType("BOOL"), -1));
Operators.Add(new OperatorInfo("-", true, GetType("VOID"), GetType("DOUBLE"), GetType("DOUBLE"), -1));
}
/// <summary>
/// Creates a new scope
/// </summary>
public static void NewScope()
{
Scope scope = new Scope();
scope.ParentScope = CurrentScope;
scope.Id = scope.ParentScope.Id + "_";
CurrentScope.ChildScope.Add(scope);
CurrentScope = scope;
}
/// <summary>
/// Given a variable name and scope, will return the type of that variable
/// </summary>
public static Int32 GetVarType(String name, Scope scope)
{
if (scope == null)
scope = CurrentScope;
foreach (var variable in scope.Variables)
{
if (variable.Name.Equals(name))
return variable.Type;
}
if (scope.ParentScope != null)
return GetVarType(name, scope.ParentScope);
return -1;
}
/// <summary>
/// Given a variable name and scope, will return the unique ID of that variable
/// </summary>
public static String GetVarId(String name, Scope scope)
{
if (scope == null)
scope = CurrentScope;
foreach (var variable in scope.Variables)
{
if (variable.Name.Equals(name))
return variable.Id;
}
if (scope.ParentScope != null)
return GetVarId(name, scope.ParentScope);
return String.Empty;
}
/// <summary>
/// Given a variable name and a scope, it will check if the variable exists in the scope
/// or any of the scope's parents
/// </summary>
public static Boolean CheckVarInScope(String Name, Scope scope)
{
foreach (var variable in scope.Variables)
{
if (variable.Name.Equals(Name))
return true;
}
//Check parent scopes
if (scope.ParentScope != null)
return CheckVarInScope(Name, scope.ParentScope);
return false;
}
/// <summary>
/// Adds a variable to the variable list
/// </summary>
public static void AddVariable(VariableInfo var, Scope scope)
{
if (scope != null)
var.Id = scope.Id + var.Name;
else
{
scope = CurrentScope;
var.Id = var.Name;
}
scope.Variables.Add(var);
}