/// <summary>
/// Initializes a new instance of the WktReader class that reads data from specific stream.
/// </summary>
/// <param name="input">The stream to read data from.</param>
public WktReader(Stream input)
{
if (input == null)
{
throw new ArgumentNullException("input", "Input stream cannot be null");
}
_inputReader = new StreamReader(input);
_tokens = new WktTokensBuffer(WktTokenizer.Tokenize(_inputReader));
}
/// <summary>
/// Processes text from TextReader and splits it into tokens.
/// </summary>
/// <param name="reader">The TextReader to read string from</param>
/// <returns>The collection parsed tokens of the input string</returns>
public static IEnumerable <WktToken> Tokenize(TextReader reader)
{
StringBuilder stringBuffer = new StringBuilder();
if (reader.Peek() == -1)
{
yield break;
}
char ch = (char)reader.Read();
stringBuffer.Append(ch);
TokenType lastToken = WktTokenizer.GetTokenType(ch);
while (reader.Peek() != -1)
{
ch = (char)reader.Read();
TokenType token = WktTokenizer.GetTokenType(ch);
// tokens COMMA, LEFT_PARENTHESIS and RIGHT_PARENTHESIS can not be grupped together
if ((token != lastToken) || token == TokenType.COMMA || token == TokenType.LEFT_PARENTHESIS || token == TokenType.RIGHT_PARENTHESIS)
{
yield return(new WktToken()
{
Type = lastToken, Value = stringBuffer.ToString()
});
stringBuffer.Clear();
lastToken = token;
}
stringBuffer.Append(ch);
}
yield return(new WktToken()
{
Type = lastToken, Value = stringBuffer.ToString()
});
}
/// <summary>
/// Parses a Geometry from WKT string.
/// </summary>
/// <param name="wkt">The string with WKT representation of a Geometry.</param>
/// <returns>The parsed Geometry.</returns>
public static Geometry Parse(string wkt)
{
WktTokensBuffer tokens = new WktTokensBuffer(WktTokenizer.Tokenize(wkt));
return(WktReader.ParseGeometryTaggedText(tokens));
}
/// <summary>
/// Initializes a new instance of the WktReader class that reads data from specific file.
/// </summary>
/// <param name="path">Path to the file to read data from.</param>
public WktReader(string path)
{
_inputFileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
_inputReader = new StreamReader(_inputFileStream);
_tokens = new WktTokensBuffer(WktTokenizer.Tokenize(_inputReader));
}
/// <summary>
/// Splits text to tokens.
/// </summary>
/// <param name="text">The text to be splitted.</param>
/// <returns>The list of parsed tokens of the input string.</returns>
public static IEnumerable <WktToken> Tokenize(string text)
{
StringReader reader = new StringReader(text);
return(WktTokenizer.Tokenize(reader));
}
