private Coordinate ParseCoordinate(WktTokenQueue tokens, WktDimensions dimensions)
{
var token = tokens.Dequeue(WktTokenType.Number);
var x = double.Parse(token.Value, CultureInfo.InvariantCulture);
token = tokens.Dequeue(WktTokenType.Number);
var y = double.Parse(token.Value, CultureInfo.InvariantCulture);
var z = double.NaN;
var m = double.NaN;
var optional = ParseOptionalOrdinates(tokens);
if (optional.Count > 0)
{
if (dimensions == WktDimensions.XYM)
{
m = optional[0];
}
else
{
z = optional[0];
if (optional.Count > 1)
m = optional[1];
}
}
if (!double.IsNaN(z) && !double.IsNaN(m))
return new CoordinateZM(y, x, z, m);
if (!double.IsNaN(z))
return new CoordinateZ(y, x, z);
if (!double.IsNaN(m))
return new CoordinateM(y, x, m);
return new Coordinate(y, x);
}
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 Coordinate ParseCoordinate(WktTokenQueue tokens, WktDimensions dimensions)
{
var token = tokens.Dequeue(WktTokenType.Number);
var x = double.Parse(token.Value, CultureInfo.InvariantCulture);
token = tokens.Dequeue(WktTokenType.Number);
var y = double.Parse(token.Value, CultureInfo.InvariantCulture);
var z = double.NaN;
var m = double.NaN;
var optional = ParseOptionalOrdinates(tokens);
if (optional.Count > 0)
{
if (dimensions == WktDimensions.XYM)
{
m = optional[0];
}
else
{
z = optional[0];
if (optional.Count > 1)
{
m = optional[1];
}
}
}
if (!double.IsNaN(z) && !double.IsNaN(m))
{
return(new CoordinateZM(y, x, z, m));
}
if (!double.IsNaN(z))
{
return(new CoordinateZ(y, x, z));
}
if (!double.IsNaN(m))
{
return(new CoordinateM(y, x, m));
}
return(new Coordinate(y, x));
}
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 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 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 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 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 LineString ParseLineStringInner(WktTokenQueue tokens, WktDimensions dimensions)
{
var coords = ParseCoordinateSequence(tokens, dimensions);
return coords == null ? LineString.Empty : new LineString(coords);
}
private LineString ParseLineStringInner(WktTokenQueue tokens, WktDimensions dimensions)
{
var coords = ParseCoordinateSequence(tokens, dimensions);
return(coords == null ? LineString.Empty : new LineString(coords));
}
