/// <summary>
/// Parses the input string into a valid HfaField, or returns null
/// if one could not be created.
/// </summary>
/// <param name="input">The input string.</param>
/// <returns>The parsed string, or null if the field could not be created.</returns>
public string Initialize(string input)
{
int length = input.Length;
int start = 0;
// Read the number
if (!input.Contains(":"))
{
return(null);
}
ItemCount = short.Parse(input.ExtractTo(ref start, ":"));
// is this a pointer?
if (input[start] == 'p' || input[start] == '*')
{
start += 1;
Pointer = input[start];
}
// Get the general type
start += 1;
if (start == length)
{
return(null);
}
ItemType = input[start];
if (!"124cCesStlLfdmMbox".Contains(ItemType.ToString()))
{
throw new HfaFieldTypeException(ItemType);
}
// If this is an object, we extract the type of the object
if (ItemType == 'o')
{
ItemObjectTypeString = input.ExtractTo(ref start, ",");
}
// If this is an inline object, we need to skip past the
// definition, and then extract the object class name.
// we ignore the actual definition, so if the object type isn't
// already defined, things will not work properly. See the
// file lceugr250)00)pct.aus for an example of inline defs.
if (ItemType == 'x' && input[start] == '{')
{
int braceDepth = 1;
start += 1;
// Skip past the definition in braces
while (braceDepth > 0 && start < input.Length)
{
if (input[start] == '{')
{
braceDepth++;
}
if (input[start] == '}')
{
braceDepth--;
}
start++;
}
ItemType = 'o';
ItemObjectTypeString = input.ExtractTo(ref start, ",");
}
// If this is an enumeration, we have to extract all the values.
if (ItemType == 'e')
{
if (!input.Contains(":"))
{
return(null);
}
int enumCount = int.Parse(input.ExtractTo(ref start, ":"));
if (EnumNames == null)
{
EnumNames = new List <string>();
}
for (int ienum = 0; ienum < enumCount; ienum++)
{
EnumNames.Add(input.ExtractTo(ref start, ","));
}
}
// Extract the field name
FieldName = input.ExtractTo(ref start, ",");
// Return whatever is left in the string, which should be a new field.
return(input.Substring(start, input.Length - start));
}