/// <summary> /// Parses a linestring text. /// </summary> /// <param name="tokens">The list of tokens.</param> /// <param name="is3D">bool value indicating whether linestring being parsed has z-coordinate.</param> /// <param name="isMeasured">bool value indicating whether linestring being parsed has m-value.</param> /// <returns>A linestring specified by tokens.</returns> /// <remarks><![CDATA[<empty set> | <left paren> <point> {<comma> <point>}* <right paren>]]></remarks> private static LineString ParseLineStringText(WktTokensBuffer tokens, bool is3D, bool isMeasured) { WktToken t = tokens.Peek(true); if (t.Type == TokenType.STRING && t.Value.ToUpperInvariant() == "EMPTY") { tokens.GetToken(true); return(new LineString()); } WktReader.Expect(TokenType.LEFT_PARENTHESIS, tokens); IEnumerable <Coordinate> coords = WktReader.ParseCoordinates(tokens, is3D, isMeasured); WktReader.Expect(TokenType.RIGHT_PARENTHESIS, tokens); return(new LineString(coords)); }