/// <summary>
/// Push list of operands onto the operands stack
/// </summary>
public static void PushFromList(this EpsStack <Operand> stack, List <Operand> operands)
{
foreach (var operand in operands)
{
stack.Push(operand);
}
}
/// <summary>
/// Move top of operands stack into a list
/// </summary>
public static List <Operand> PopToList(this EpsStack <Operand> stack, int count)
{
var operands = new List <Operand>();
for (int i = 0; i < count; i++)
{
operands.Add(stack.Pop());
}
operands.Reverse();
return(operands);
}
/// <summary>
/// Find the dictionary within the dictionary stack that holds the given key
/// </summary>
/// <param name="dictionaryStack"></param>
/// <param name="key"></param>
/// <returns>the found dictionary or null</returns>
public static EpsDictionary FindDictionary(EpsStack <EpsDictionary> dictionaryStack, Operand key)
{
for (int i = dictionaryStack.Count - 1; i >= 0; i--)
{
var dict = dictionaryStack[i];
var op = dict.TryFind(key);
if (op != null)
{
return(dict);
}
}
return(null);
}
/// <summary>
/// Remove all non-permanet dictionaries from the dictionary stack
/// </summary>
/// <param name="dictionaryStack"></param>
public static void RemoveNonPermanentDictionaries(EpsStack <EpsDictionary> dictionaryStack)
{
int i = 0;
while (i < dictionaryStack.Count)
{
var dict = dictionaryStack[i];
if (!dict.IsPermanent)
{
dictionaryStack.RemoveAt(i);
}
else
{
i++;
}
}
}
/// <summary>
/// Pop a string value from the stack
/// </summary>
public static string PopStringValue(this EpsStack <Operand> stack)
{
return(OperandHelper.GetStringValue(stack.Pop()));
}
/// <summary>
/// Pop a file operand from the stack
/// </summary>
public static FileOperand PopFile(this EpsStack <Operand> stack)
{
return((FileOperand)stack.Pop());
}
/// <summary>
/// Pop a Dictionary operand from the stack
/// </summary>
public static DictionaryOperand PopDictionary(this EpsStack <Operand> stack)
{
return((DictionaryOperand)stack.Pop());
}
/// <summary>
/// Peek an array operand from the stack
/// </summary>
public static ArrayOperand PeekArray(this EpsStack <Operand> stack)
{
return((ArrayOperand)stack.Peek());
}
/// <summary>
/// Pop an integer operand from the stack
/// </summary>
public static IntegerOperand PopInteger(this EpsStack <Operand> stack)
{
return((IntegerOperand)stack.Pop());
}
/// <summary>
/// Pop a name operand from the stack
/// </summary>
public static NameOperand PopName(this EpsStack <Operand> stack)
{
return((NameOperand)stack.Pop());
}
/// <summary>
/// Pop a string operand from the stack
/// </summary>
public static StringOperand PopString(this EpsStack <Operand> stack)
{
return((StringOperand)stack.Pop());
}
/// <summary>
/// Pop a boolean operand from the stack
/// </summary>
public static BooleanOperand PopBoolean(this EpsStack <Operand> stack)
{
return((BooleanOperand)stack.Pop());
}
/// <summary>
/// Pop a real or integer operand from the stack and return
/// its value as double.
/// </summary>
/// <returns>a double value</returns>
public static double PopRealValue(this EpsStack <Operand> stack)
{
return(OperandHelper.GetRealValue(stack.Pop()));
}
/// <summary>
/// Pop an integer value from the stack
/// </summary>
public static int PopIntegerValue(this EpsStack <Operand> stack)
{
return(((IntegerOperand)stack.Pop()).Value);
}
