Package org.antlr.v4.runtime

Interface TokenStream

All Superinterfaces:
IntStream
All Known Implementing Classes:
BufferedTokenStream, CommonTokenStream, UnbufferedTokenStream
public interface TokenStream extends IntStream
An IntStream whose symbols are Token instances.

  • Method Details

    • LT

      @NotNull Token LT(int k)
      Get the Token instance associated with the value returned by LA(k). This method has the same pre- and post-conditions as IntStream.LA(int). In addition, when the preconditions of this method are met, the return value is non-null and the value of LT(k).getType()==LA(k).
      See Also:

    • get

      @NotNull Token get(int i)
      Gets the Token at the specified index in the stream. When the preconditions of this method are met, the return value is non-null.

      The preconditions for this method are the same as the preconditions of IntStream.seek(int). If the behavior of seek(index) is unspecified for the current state and given index, then the behavior of this method is also unspecified.

      The symbol referred to by index differs from seek() only in the case of filtering streams where index lies before the end of the stream. Unlike seek(), this method does not adjust index to point to a non-ignored symbol.

      Throws:
      IllegalArgumentException - if {code index} is less than 0
      UnsupportedOperationException - if the stream does not support retrieving the token at the specified index

    • getTokenSource

      @NotNull TokenSource getTokenSource()
      Gets the underlying TokenSource which provides tokens for this stream.

    • getText

      @NotNull String getText(@NotNull Interval interval)
      Return the text of all tokens within the specified interval. This method behaves like the following code (including potential exceptions for violating preconditions of get(int), but may be optimized by the specific implementation. 
       TokenStream stream = ...;
 String text = "";
 for (int i = interval.a; i <= interval.b; i++) {
   text += stream.get(i).getText();
 }
      Parameters:
      interval - The interval of tokens within this stream to get text for.
      Returns:
      The text of all tokens within the specified interval in this stream.
      Throws:
      NullPointerException - if interval is null

    • getText

      @NotNull String getText()
      Return the text of all tokens in the stream. This method behaves like the following code, including potential exceptions from the calls to IntStream.size() and getText(Interval), but may be optimized by the specific implementation. 
       TokenStream stream = ...;
 String text = stream.getText(new Interval(0, stream.size()));
      Returns:
      The text of all tokens in the stream.

    • getText

      @NotNull String getText(@NotNull RuleContext ctx)
      Return the text of all tokens in the source interval of the specified context. This method behaves like the following code, including potential exceptions from the call to getText(Interval), but may be optimized by the specific implementation.

      If ctx.getSourceInterval() does not return a valid interval of tokens provided by this stream, the behavior is unspecified.

       TokenStream stream = ...;
 String text = stream.getText(ctx.getSourceInterval());
      Parameters:
      ctx - The context providing the source interval of tokens to get text for.
      Returns:
      The text of all tokens within the source interval of ctx.

    • getText

      @NotNull String getText(Object start, Object stop)
      Return the text of all tokens in this stream between start and stop (inclusive).

      If the specified start or stop token was not provided by this stream, or if the stop occurred before the start token, the behavior is unspecified.

      For streams which ensure that the Token.getTokenIndex() method is accurate for all of its provided tokens, this method behaves like the following code. Other streams may implement this method in other ways provided the behavior is consistent with this at a high level.

       TokenStream stream = ...;
 String text = "";
 for (int i = start.getTokenIndex(); i <= stop.getTokenIndex(); i++) {
   text += stream.get(i).getText();
 }
      Parameters:
      start - The first token in the interval to get text for.
      stop - The last token in the interval to get text for (inclusive).
      Returns:
      The text of all tokens lying between the specified start and stop tokens.
      Throws:
      UnsupportedOperationException - if this stream does not support this method for the specified tokens