/// <summary>
/// Parses the Brush data string and converts it into ICanvasBrushElement.
/// </summary>
/// <param name="brushData">Brush data</param>
/// <returns>ICanvasBrushElement</returns>
internal static ICanvasBrushElement Parse(string brushData)
{
var matches = RegexFactory.CanvasBrushRegex.Matches(brushData);
// If no match is found or no captures in the match, then it means that the brush data is invalid.
if (matches.Count == 0)
{
ThrowForZeroCount();
}
// If the match contains more than one captures, it means that there are multiple brushes present in the brush data.
// There should be only one brush defined in the brush data.
if (matches.Count > 1)
{
ThrowForNotOneCount();
}
// There should be only one match
var match = matches[0];
AbstractCanvasBrushElement brushElement = null;
if (match.Groups["SolidColorBrush"].Success)
{
brushElement = new SolidColorBrushElement(match.Groups["SolidColorBrush"].Captures[0]);
}
else if (match.Groups["LinearGradient"].Success)
{
brushElement = new LinearGradientBrushElement(match.Groups["LinearGradient"].Captures[0]);
}
else if (match.Groups["LinearGradientHdr"].Success)
{
brushElement = new LinearGradientHdrBrushElement(match.Groups["LinearGradientHdr"].Captures[0]);
}
else if (match.Groups["RadialGradient"].Success)
{
brushElement = new RadialGradientBrushElement(match.Groups["RadialGradient"].Captures[0]);
}
else if (match.Groups["RadialGradientHdr"].Success)
{
brushElement = new RadialGradientHdrBrushElement(match.Groups["RadialGradientHdr"].Captures[0]);
}
if (brushElement == null)
{
return(null);
}
// Perform validation to check if there are any invalid characters in the brush data that were not captured
var preValidationCount = RegexFactory.ValidationRegex.Replace(brushData, string.Empty).Length;
var postValidationCount = brushElement.ValidationCount;
// If there are invalid characters, extract them and add them to the ArgumentException message
if (preValidationCount != postValidationCount)
{
static void ThrowForInvalidCharacters(AbstractCanvasBrushElement brushElement, string brushData)
{
var parseIndex = 0;
if (!string.IsNullOrWhiteSpace(brushElement.Data))
{
parseIndex = brushData.IndexOf(brushElement.Data, parseIndex, StringComparison.Ordinal);
}
var errorString = brushData.Substring(parseIndex);
if (errorString.Length > 30)
{
errorString = $"{errorString.Substring(0, 30)}...";
}
throw new ArgumentException($"BRUSH_ERR003:Brush data contains invalid characters!\nIndex: {parseIndex}\n{errorString}");
}
/// <summary>
/// Parses the Brush data string and converts it into ICanvasBrushElement
/// </summary>
/// <param name="brushData">Brush data</param>
/// <returns>ICanvasBrushElement</returns>
internal static ICanvasBrushElement Parse(string brushData)
{
var matches = RegexFactory.CanvasBrushRegex.Matches(brushData);
// If no match is found or no captures in the match, then it means
// that the brush data is invalid.
if ((matches == null) || (matches.Count == 0))
{
throw new ArgumentException($"Invalid Brush data!\nBrush Data: {brushData}", nameof(brushData));
}
// If the match contains more than one captures, it means that there
// are multiple brushes present in the brush data. There should
// be only one brush defined in the brush data.
if (matches.Count > 1)
{
throw new ArgumentException("Multiple Brushes defined in Brush Data! " +
"There should be only one Brush definition within the Brush Data. " +
"You can either remove Brush definitions or split the Brush Data " +
"into multiple Brush Data and call the CanvasObject.CreateBrush() method on each of them." +
$"\nBrush Data: {brushData}");
}
// There should be only one match
var match = matches[0];
AbstractCanvasBrushElement brushElement = null;
if (match.Groups["SolidColorBrush"].Success)
{
brushElement = new SolidColorBrushElement(match.Groups["SolidColorBrush"].Captures[0]);
}
else if (match.Groups["LinearGradient"].Success)
{
brushElement = new LinearGradientBrushElement(match.Groups["LinearGradient"].Captures[0]);
}
else if (match.Groups["LinearGradientHdr"].Success)
{
brushElement = new LinearGradientHdrBrushElement(match.Groups["LinearGradientHdr"].Captures[0]);
}
else if (match.Groups["RadialGradient"].Success)
{
brushElement = new RadialGradientBrushElement(match.Groups["RadialGradient"].Captures[0]);
}
else if (match.Groups["RadialGradientHdr"].Success)
{
brushElement = new RadialGradientHdrBrushElement(match.Groups["RadialGradientHdr"].Captures[0]);
}
if (brushElement == null)
{
return(null);
}
// Perform validation to check if there are any invalid characters in the brush data that were not captured
var preValidationCount = RegexFactory.ValidationRegex.Replace(brushData, string.Empty).Length;
var postValidationCount = brushElement.ValidationCount;
if (preValidationCount != postValidationCount)
{
throw new ArgumentException($"Brush data contains invalid characters!\nBrush Data: {brushData}", nameof(brushData));
}
return(brushElement);
}