/// <summary>
/// Reads a value in radians.
/// </summary>
/// <param name="field">A tag associated with the value</param>
/// <returns>The radian value that was read.</returns>
internal RadianValue ReadRadians(DataField field)
{
string s = m_Reader.ReadString(field.ToString());
double d = RadianValue.Parse(s);
return(new RadianValue(d));
}
/// <summary>
/// Write a value in radians to a storage medium.
/// </summary>
/// <param name="field">The tag that identifies the item.</param>
/// <param name="value">The radian value to write</param>
internal void WriteRadians(DataField field, RadianValue value)
{
m_Writer.WriteString(field.ToString(), value.AsShortString());
}
void ParseWord(string str)
{
// Return if string is empty (could be empty if this function
// has been called recursively from below).
str = str.Trim();
int nc = str.Length;
if (nc == 0)
{
return;
}
// If we have a new default units specification, make it
// the default. There should be whitespace after the "..."
if (str.Contains("..."))
{
DistanceUnit unit = GetUnits(str, true);
PathItem item = new PathItem(PathItemType.Units, unit, 0.0);
AddItem(item);
return;
}
// If we have a counter-clockwise indicator, just remember it
// and parse anything that comes after it.
if (nc >= 2 && String.Compare(str.Substring(0, 2), "cc", true) == 0)
{
AddItem(PathItemType.CounterClockwise);
ParseWord(str.Substring(2));
return;
}
// If we have a BC, remember it & parse anything that follows.
if (str[0] == '(')
{
AddItem(PathItemType.BC);
ParseWord(str.Substring(1));
return;
}
// If we have a EC, remember it & parse anything that follows.
if (str[0] == ')')
{
AddItem(PathItemType.EC);
ParseWord(str.Substring(1));
return;
}
// If we have a single slash character (possibly followed by
// a digit or a decimal point), record the single slash &
// parse anything that follows.
if (str[0] == '/')
{
// Check for a free-standing slash, or a slash that is
// followed by a numeric digit or decimal point.
if (nc == 1 || Char.IsDigit(str, 1) || str[1] == '.')
{
AddItem(PathItemType.Slash);
ParseWord(str.Substring(1));
return;
}
// More than one character, or what follows is not a digit.
// So we are dealing with either a miss-connect, or an
// omit-point. In either case, there should be whitespace
// after that.
if (nc == 2)
{
if (str[1] == '-')
{
AddItem(PathItemType.MissConnect);
return;
}
if (str[1] == '*')
{
AddItem(PathItemType.OmitPoint);
return;
}
}
// Allow CADCOR-style data entry
else if (nc == 3)
{
if (String.Compare(str, "/mc", true) == 0)
{
AddItem(PathItemType.MissConnect);
return;
}
if (String.Compare(str, "/op", true) == 0)
{
AddItem(PathItemType.OmitPoint);
return;
}
}
string msg = String.Format("Unexpected qualifier '{0}'", str);
throw new ApplicationException(msg);
}
// If we have a multiplier, it must be immediately followed
// by a numeric (integer) value.
if (str[0] == '*')
{
if (nc == 1)
{
throw new ApplicationException("Unexpected '*' character");
}
// Pick up the repeat count (not sure if the digits need to be
// followed by white space, or whether non-numeric digits are valid,
// so pick up only the digits).
string num = GetIntDigits(str.Substring(1));
// Error if repeat count is less than 2.
int repeat;
if (!Int32.TryParse(num, out repeat) || repeat < 2)
{
string msg = String.Format("Unexpected repeat count in '{0}'", str);
throw new ApplicationException(msg);
}
if (repeat < 2)
{
string msg = String.Format("Unexpected repeat count in '{0}'", str);
throw new ApplicationException(msg);
}
// Duplicate the last item using the repeat count.
AddRepeats(repeat);
// Continue parsing after the repeat count.
ParseWord(str.Substring(1 + num.Length));
return;
}
// If the string contains an embedded qualifier (a "*" or a "/"
// character), process the portion of any string prior to the
// qualifier. Note that we have just handled the cases where
// the qualifier was at the very start of the string.
int starIndex = str.IndexOf('*');
int slashIndex = str.IndexOf('/');
if (starIndex >= 0 || slashIndex >= 0)
{
int qualIndex = starIndex;
if (qualIndex < 0 || (slashIndex >= 0 && qualIndex > slashIndex))
{
qualIndex = slashIndex;
}
// Process the stuff prior to the qualifier.
string copy = str.Substring(0, qualIndex);
ParseWord(copy);
// Process the stuff, starting with the qualifier character
ParseWord(str.Substring(qualIndex));
return;
}
// Process this string. We should have either a value or an angle.
if (str.IndexOf('-') >= 0 || IsLastItemBC())
{
// If the string contains a "c" character, it's a central
// angle; process the string only as far as that.
PathItemType type = PathItemType.Angle;
int caIndex = str.ToUpper().IndexOf('C');
if (caIndex >= 0)
{
str = str.Substring(0, caIndex);
type = PathItemType.CentralAngle;
}
else
{
// Check if it's a deflection (if so, strip out the "d").
int dIndex = str.ToUpper().IndexOf('D');
if (dIndex >= 0)
{
str = str.Substring(0, dIndex) + str.Substring(dIndex + 1);
type = PathItemType.Deflection;
}
}
// Try to parse an angular value into radians.
double radval;
if (RadianValue.TryParse(str, out radval))
{
PathItem item = new PathItem(type, null, radval);
AddItem(item);
return;
}
// Bad angle.
string msg = String.Format("Malformed angle '{0}'", str);
throw new ApplicationException(msg);
}
else
{
// Get the current distance units.
DistanceUnit unit = GetUnits(null, false);
// Grab characters that look like a floating point number
string num = GetDoubleDigits(str);
double val;
if (!Double.TryParse(num, out val))
{
string msg = String.Format("Malformed value '{0}'", str);
throw new ApplicationException(msg);
}
// If we didn't get right to the end, we may have distance units,
// or the ")" character indicating an EC.
if (num.Length < str.Length && str[num.Length] != ')')
{
unit = GetUnits(str.Substring(num.Length), false);
if (unit == null)
{
string msg = String.Format("Malformed value '{0}'", str);
throw new ApplicationException(msg);
}
}
PathItem item = new PathItem(PathItemType.Value, unit, val);
AddItem(item);
if (str.Length > num.Length && str[num.Length] == ')')
{
ParseWord(str.Substring(num.Length));
}
return;
}
}