private CoordinateInfo[] ParseCoordinateSequence(WktTokenQueue tokens, Dimensions dimensions)
{
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(new CoordinateInfo[0]);
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var coordinates = new List <CoordinateInfo> {
ParseCoordinate(tokens, dimensions)
};
while (tokens.NextTokenIs(WktTokenType.Comma))
{
tokens.Dequeue();
coordinates.Add(ParseCoordinate(tokens, dimensions));
}
tokens.Dequeue(WktTokenType.RightParenthesis);
return(coordinates.ToArray());
}
private object ParseGeometryCollection(WktTokenQueue tokens)
{
tokens.Dequeue("GEOMETRYCOLLECTION");
ParseDimensions(tokens);
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(_shapeConverter.ToGeometryCollection(new object[0]));
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var geometries = new List <object>();
geometries.Add(ParseGeometry(tokens));
while (tokens.NextTokenIs(WktTokenType.Comma))
{
tokens.Dequeue();
geometries.Add(ParseGeometry(tokens));
}
tokens.Dequeue(WktTokenType.RightParenthesis);
return(_shapeConverter.ToGeometryCollection(geometries.ToArray()));
}
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 object ParseMultiPolygon(WktTokenQueue tokens)
{
tokens.Dequeue("MULTIPOLYGON");
var dimensions = ParseDimensions(tokens);
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(_shapeConverter.ToMultiPolygon(new CoordinateInfo[0][][]));
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var polygons = new List <CoordinateInfo[][]> {
ParseLineStrings(tokens, dimensions)
};
while (tokens.NextTokenIs(WktTokenType.Comma))
{
tokens.Dequeue();
polygons.Add(ParseLineStrings(tokens, dimensions));
}
tokens.Dequeue(WktTokenType.RightParenthesis);
return(_shapeConverter.ToMultiPolygon(polygons.ToArray()));
}
private object ParsePolygonInner(WktTokenQueue tokens, Dimensions dimensions)
{
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(_shapeConverter.FromPolygon(new CoordinateInfo[0][][]));
}
var linestrings = ParseLineStrings(tokens, dimensions);
return(_shapeConverter.ToPolygon(linestrings));
}
private CoordinateInfo ParseMultiPointCoordinate(WktTokenQueue tokens, Dimensions dimensions)
{
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(null);
}
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(coordinate);
}
private object ParseMultiLineString(WktTokenQueue tokens)
{
tokens.Dequeue("multilinestring");
var dimensions = ParseDimensions(tokens);
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(_shapeConverter.ToMultiLineString(new CoordinateInfo[0][]));
}
var lineStrings = ParseLineStrings(tokens, dimensions);
return(_shapeConverter.ToMultiLineString(lineStrings));
}
private CoordinateInfo[][] ParseLineStrings(WktTokenQueue tokens, Dimensions dimensions)
{
tokens.Dequeue(WktTokenType.LeftParenthesis);
var lineStrings = new List <CoordinateInfo[]> {
ParseCoordinateSequence(tokens, dimensions)
};
while (tokens.NextTokenIs(WktTokenType.Comma))
{
tokens.Dequeue();
lineStrings.Add(ParseCoordinateSequence(tokens, dimensions));
}
tokens.Dequeue(WktTokenType.RightParenthesis);
return(lineStrings.ToArray());
}
private object ParsePoint(WktTokenQueue tokens)
{
tokens.Dequeue("POINT");
var dimensions = ParseDimensions(tokens);
if (tokens.NextTokenIs("EMPTY"))
{
tokens.Dequeue();
return(_shapeConverter.ToPoint(null));
}
tokens.Dequeue(WktTokenType.LeftParenthesis);
var coordinate = ParseCoordinate(tokens, dimensions);
tokens.Dequeue(WktTokenType.RightParenthesis);
return(_shapeConverter.ToPoint(coordinate));
}
