internal int AddParametricSegment(int segmentTextStart, PcParameter parameter)
{
LineSegments.Add(
new PcLineSegment(parameter)
);
//Return the location of the start of the next segment
return(segmentTextStart + parameter.ParameterPlaceholderLength);
}
/// <summary>
/// Find the next occurance of a parameter placeholder inside the given line
/// </summary>
/// <param name="lineText"></param>
/// <param name="startAt"></param>
/// <param name="parameter"></param>
/// <returns></returns>
private int NextParameter(string lineText, int startAt, out PcParameter parameter)
{
//Find the first occurance of a left delimiter starting from nextSegmentStart
var leftDelIndex =
lineText.IndexOf(
LeftDelimiter,
startAt,
StringComparison.Ordinal
);
while (true)
{
//No left delimiter is found. end search for parameter placeholder
if (leftDelIndex < 0)
{
parameter = null;
return(-1);
}
//Find first occurance of a right delimiter starting after the left delimiter that was found
var rightDelIndex =
lineText.IndexOf(
RightDelimiter,
leftDelIndex + LeftDelimiter.Length,
StringComparison.Ordinal
);
//A right delimiter is not found. End search for parameter placeholder
if (rightDelIndex <= leftDelIndex)
{
parameter = null;
return(-1);
}
//A right delimiter is found
var startIndex = leftDelIndex + LeftDelimiter.Length;
var endIndex = rightDelIndex - 1;
var length = endIndex - startIndex + 1;
//Read the text between the left and right delimiters
var parameterName = lineText.Substring(startIndex, length);
//If the text is not a legal parameter name try searching for a new left delimiter
if (parameterName.All(c => c == '_' || Char.IsLetterOrDigit(c)) == false)
{
leftDelIndex =
lineText.IndexOf(
LeftDelimiter,
leftDelIndex + 1,
StringComparison.Ordinal
);
continue;
}
//If the parameter name is not defined add it with an empty string value
if (_parameters.TryGetValue(parameterName, out parameter) == false)
{
parameter = new PcParameter(this, parameterName);
_parameters.Add(parameterName, parameter);
}
return(leftDelIndex);
}
}