private static bool ParseHeaderElement(PlyTokenStream tokenStream, IList <ElementConfiguration> elementsConfiguration)
{
SkipComments(tokenStream);
if (tokenStream.CurToken == "end_header")
{
tokenStream.ReadToken();
tokenStream.NextLineExpectNoMoreTokens();
return(false);
}
tokenStream.NextTokenExpectValue("element", "'element' keyword was expected.");
var elementName = tokenStream.ReadTokenExpected();
if (elementName == null || (elementName != "vertex" && elementName != "face" && elementName != "edge"))
{
throw new PlyParsingExcpetion(string.Format("Unsupported element {0}", elementName));
}
var count = int.Parse(tokenStream.ReadTokenExpected());
tokenStream.NextLineExpectNoMoreTokens();
SkipComments(tokenStream);
var properties = new List <Tuple <string, string> >();
while (tokenStream.CurToken == "property")
{
tokenStream.NextToken();
var type = tokenStream.ReadTokenExpected();
string fullType;
if (type == "list")
{
var listIndexType = tokenStream.ReadTokenExpected();
var listValuesType = tokenStream.ReadTokenExpected();
fullType = string.Format("{0}:{1}:{2}", type, listIndexType, listValuesType);
}
else
{
fullType = type;
}
var name = tokenStream.ReadTokenExpected();
properties.Add(Tuple.Create(fullType, name));
tokenStream.NextLineExpectNoMoreTokens();
SkipComments(tokenStream);
}
elementsConfiguration.Add(new ElementConfiguration(elementName, properties, count));
return(true);
}
private static void SkipComments(PlyTokenStream tokenStream)
{
while (tokenStream.CurToken == "comment")
{
tokenStream.NextLine();
}
}
private static IEnumerable <ElementConfiguration> ParseHeader(PlyTokenStream tokenStream)
{
tokenStream.NextTokenExpectValue("ply", "'ply' magic string was expected.");
tokenStream.NextLineExpectNoMoreTokens();
tokenStream.NextTokenExpectValue("format", "'format' keyword was expected.");
tokenStream.NextTokenExpectValue("ascii", "Only ascii format is supported.");
tokenStream.NextTokenExpectValue("1.0", "Only PLY 1.0 is supported");
tokenStream.NextLineExpectNoMoreTokens();
var elementsConfiguration = new List <ElementConfiguration>();
while (ParseHeaderElement(tokenStream, elementsConfiguration))
{
}
return(elementsConfiguration);
}
public static void Parse <TVertex, TFace, TEdge>(
string plyData,
out IReadOnlyList <TVertex> vertices,
out IReadOnlyList <TFace> faces,
out IReadOnlyList <TEdge> edges)
where TVertex : PlyVertex, new()
where TFace : PlyFace, new()
where TEdge : PlyEdge, new()
{
var verticesList = new List <TVertex>();
var facesList = new List <TFace>();
var edgesList = new List <TEdge>();
var tokenStream = new PlyTokenStream(plyData);
var elementsConfiguration = ParseHeader(tokenStream);
foreach (var elementConfiguration in elementsConfiguration)
{
var parametersParser = new PlyParametersParser(elementConfiguration.Properties);
for (int i = 0; i < elementConfiguration.Count; i++)
{
parametersParser.SetParameters(tokenStream.CurLine);
var element = CreateElement <TVertex, TFace, TEdge>(
verticesList,
facesList,
edgesList,
elementConfiguration.Name);
element.Parse(parametersParser);
tokenStream.NextLine();
}
}
vertices = verticesList.AsReadOnlyList();
faces = facesList.AsReadOnlyList();
edges = edgesList.AsReadOnlyList();
}
