private static List <GeoCoordinate> ParseCoordinates(WellKnownTextTokenizer tokenizer)
{
var coordinates = new List <GeoCoordinate>();
if (IsNumberNext(tokenizer) || tokenizer.NextToken() == TokenType.LParen)
{
coordinates.Add(ParseCoordinate(tokenizer));
}
while (NextCloserOrComma(tokenizer) == TokenType.Comma)
{
var isOpenParen = false;
if (IsNumberNext(tokenizer) || (isOpenParen = tokenizer.NextToken() == TokenType.LParen))
{
coordinates.Add(ParseCoordinate(tokenizer));
}
if (isOpenParen)
{
NextCloser(tokenizer);
}
}
return(coordinates);
}
private static void NextCloser(WellKnownTextTokenizer tokenizer)
{
if (tokenizer.NextToken() != TokenType.RParen)
{
throw new GeoWKTException(
$"Expected {(char)WellKnownTextTokenizer.RParen} " +
$"but found: {tokenizer.TokenString()}", tokenizer.LineNumber, tokenizer.Position);
}
}
private static TokenType NextCloserOrComma(WellKnownTextTokenizer tokenizer)
{
var token = tokenizer.NextToken();
if (token == TokenType.Comma || token == TokenType.RParen)
{
return(token);
}
throw new GeoWKTException(
$"Expected {(char)WellKnownTextTokenizer.Comma} or {(char)WellKnownTextTokenizer.RParen} " +
$"but found: {tokenizer.TokenString()}", tokenizer.LineNumber, tokenizer.Position);
}
private static TokenType NextEmptyOrOpen(WellKnownTextTokenizer tokenizer)
{
var token = tokenizer.NextToken();
if (token == TokenType.LParen ||
token == TokenType.Word && tokenizer.TokenValue.Equals(WellKnownTextTokenizer.Empty, StringComparison.OrdinalIgnoreCase))
{
return(token);
}
throw new GeoWKTException(
$"Expected {WellKnownTextTokenizer.Empty} or {(char)WellKnownTextTokenizer.LParen} " +
$"but found: {tokenizer.TokenString()}", tokenizer.LineNumber, tokenizer.Position);
}
private static double NextNumber(WellKnownTextTokenizer tokenizer)
{
if (tokenizer.NextToken() == TokenType.Number)
{
if (string.Equals(tokenizer.TokenValue, WellKnownTextTokenizer.NaN, StringComparison.OrdinalIgnoreCase))
{
return(double.NaN);
}
if (double.TryParse(
tokenizer.TokenValue,
NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign,
CultureInfo.InvariantCulture, out var d))
{
return(d);
}
}
throw new GeoWKTException(
$"Expected number but found: {tokenizer.TokenString()}", tokenizer.LineNumber, tokenizer.Position);
}
private static IGeoShape Read(WellKnownTextTokenizer tokenizer, string shapeType)
{
var token = tokenizer.NextToken();
if (token != TokenType.Word)
{
throw new GeoWKTException(
$"Expected word but found {tokenizer.TokenString()}", tokenizer.LineNumber, tokenizer.Position);
}
var type = tokenizer.TokenValue.ToUpperInvariant();
if (shapeType != null && shapeType != GeoShapeType.GeometryCollection && type != shapeType)
{
throw new GeoWKTException($"Expected geometry type {shapeType} but found {type}");
}
switch (type)
{
case GeoShapeType.Point:
var point = ParsePoint(tokenizer);
point.Format = GeoShapeFormat.WellKnownText;
return(point);
case GeoShapeType.MultiPoint:
var multiPoint = ParseMultiPoint(tokenizer);
multiPoint.Format = GeoShapeFormat.WellKnownText;
return(multiPoint);
case GeoShapeType.LineString:
var lineString = ParseLineString(tokenizer);
lineString.Format = GeoShapeFormat.WellKnownText;
return(lineString);
case GeoShapeType.MultiLineString:
var multiLineString = ParseMultiLineString(tokenizer);
multiLineString.Format = GeoShapeFormat.WellKnownText;
return(multiLineString);
case GeoShapeType.Polygon:
var polygon = ParsePolygon(tokenizer);
polygon.Format = GeoShapeFormat.WellKnownText;
return(polygon);
case GeoShapeType.MultiPolygon:
var multiPolygon = ParseMultiPolygon(tokenizer);
multiPolygon.Format = GeoShapeFormat.WellKnownText;
return(multiPolygon);
case GeoShapeType.BoundingBox:
var envelope = ParseBoundingBox(tokenizer);
envelope.Format = GeoShapeFormat.WellKnownText;
return(envelope);
case GeoShapeType.GeometryCollection:
var geometryCollection = ParseGeometryCollection(tokenizer);
geometryCollection.Format = GeoShapeFormat.WellKnownText;
return(geometryCollection);
default:
throw new GeoWKTException($"Unknown geometry type: {type}");
}
}