private List <double> ParseOptionalOrdinates(WktTokenQueue tokens)
{
var attempt = true;
var doubles = new List <double>();
while (attempt)
{
if (tokens.NextTokenIs(WktTokenType.Number))
{
var token = tokens.Dequeue(WktTokenType.Number);
doubles.Add(double.Parse(token.Value, CultureInfo.InvariantCulture));
}
else if (tokens.NextTokenIs(double.NaN.ToString(CultureInfo.InvariantCulture)))
{
//TODO: Review this
tokens.Dequeue(WktTokenType.String);
doubles.Add(double.NaN);
}
else
{
attempt = false;
}
}
return(doubles);
}
private MultiPolygon ParseMultiPolygon(WktTokenQueue tokens)
{
tokens.Dequeue("MULTIPOLYGON");
var dimensions = ParseDimensions(tokens);
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(MultiPolygon.Empty);
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var polygons = new List <Polygon> {
ParsePolygonInner(tokens, dimensions)
};
while (tokens.NextTokenIs(WktTokenType.Comma))
{
tokens.Dequeue();
polygons.Add(ParsePolygonInner(tokens, dimensions));
}
tokens.Dequeue(WktTokenType.RightParenthesis);
return(new MultiPolygon(polygons));
}
private GeometryCollection ParseGeometryCollection(WktTokenQueue tokens)
{
tokens.Dequeue("GEOMETRYCOLLECTION");
ParseDimensions(tokens);
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(GeometryCollection.Empty);
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var geometries = new List <IGeometry>();
geometries.Add(ParseGeometry(tokens));
while (tokens.NextTokenIs(WktTokenType.Comma))
{
tokens.Dequeue();
geometries.Add(ParseGeometry(tokens));
}
tokens.Dequeue(WktTokenType.RightParenthesis);
return(new GeometryCollection(geometries));
}
private MultiPoint ParseMultiPoint(WktTokenQueue tokens)
{
tokens.Dequeue("MULTIPOINT");
var dimensions = ParseDimensions(tokens);
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(MultiPoint.Empty);
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var points = new List <Point> {
ParseMultiPointCoordinate(tokens, dimensions)
};
while (tokens.NextTokenIs(WktTokenType.Comma))
{
tokens.Dequeue();
points.Add(ParseMultiPointCoordinate(tokens, dimensions));
}
tokens.Dequeue(WktTokenType.RightParenthesis);
return(new MultiPoint(points));
}
private Point ParseMultiPointCoordinate(WktTokenQueue tokens, WktDimensions dimensions)
{
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(Point.Empty);
}
var parenthesis = false;
if (tokens.NextTokenIs(WktTokenType.LeftParenthesis))
{
tokens.Dequeue(WktTokenType.LeftParenthesis);
parenthesis = true;
}
var coordinate = ParseCoordinate(tokens, dimensions);
if (parenthesis && tokens.NextTokenIs(WktTokenType.RightParenthesis))
{
tokens.Dequeue(WktTokenType.RightParenthesis);
}
return(new Point(coordinate));
}
private List <LineString> ParseLineStrings(WktTokenQueue tokens, WktDimensions dimensions)
{
var lineStrings = new List <LineString> {
ParseLineStringInner(tokens, dimensions)
};
while (tokens.NextTokenIs(WktTokenType.Comma))
{
tokens.Dequeue();
lineStrings.Add(ParseLineStringInner(tokens, dimensions));
}
return(lineStrings);
}
private Polygon ParsePolygonInner(WktTokenQueue tokens, WktDimensions dimensions)
{
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(Polygon.Empty);
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var linestrings = ParseLineStrings(tokens, dimensions);
tokens.Dequeue(WktTokenType.RightParenthesis);
return(new Polygon(new LinearRing(linestrings.First().Coordinates), linestrings.Skip(1).Select(x => new LinearRing(x.Coordinates))));
}
private CoordinateSequence ParseCoordinateSequence(WktTokenQueue tokens, WktDimensions dimensions)
{
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(null);
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var coordinates = new List <Coordinate> {
ParseCoordinate(tokens, dimensions)
};
while (tokens.NextTokenIs(WktTokenType.Comma))
{
tokens.Dequeue();
coordinates.Add(ParseCoordinate(tokens, dimensions));
}
tokens.Dequeue(WktTokenType.RightParenthesis);
return(new CoordinateSequence(coordinates));
}
private Point ParsePoint(WktTokenQueue tokens)
{
tokens.Dequeue("POINT");
var dimensions = ParseDimensions(tokens);
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(Point.Empty);
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var coordinate = ParseCoordinate(tokens, dimensions);
tokens.Dequeue(WktTokenType.RightParenthesis);
return(new Point(coordinate));
}
private MultiLineString ParseMultiLineString(WktTokenQueue tokens)
{
tokens.Dequeue("multilinestring");
var dimensions = ParseDimensions(tokens);
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(MultiLineString.Empty);
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var lineStrings = ParseLineStrings(tokens, dimensions);
tokens.Dequeue(WktTokenType.RightParenthesis);
return(new MultiLineString(lineStrings));
}