ANTLR 4 Runtime 4.13.1 · org.antlr.v4.runtime.TokenSource

A source of tokens must provide a sequence of tokens via nextToken() and also must reveal it's source of characters; CommonToken's text is computed from a CharStream; it only store indices into the char stream.

Errors from the lexer are never passed to the parser. Either you want to keep going or you do not upon token recognition error. If you do not want to continue lexing then you do not want to continue parsing. Just throw an exception not under RecognitionException and Java will naturally toss you all the way out of the recognizers. If you want to continue lexing then you should not throw an exception to the parser--it has already requested a token. Keep lexing until you get a valid one. Just report errors and keep going, looking for a valid token.

Method Summary

Modifier and Type	Method and Description
public int	Returns: The line number for the current position in the input stream, or -1 if the current token source does not track character positions. getCharPositionInLine() Get the index into the current line for the current position in the input stream.
public CharStream	Returns: The `CharStream` associated with the current position in the input, or `null` if no input stream is available for the token source. getInputStream() Get the `CharStream` from which this token source is currently providing tokens.
public int	Returns: The line number for the current position in the input stream, or 0 if the current token source does not track line numbers. getLine() Get the line number for the current position in the input stream.
public String	getSourceName() Gets the name of the underlying input source.
public TokenFactory<?>	Returns: The `TokenFactory` currently used by this token source. getTokenFactory() Gets the `TokenFactory` this token source is currently using for creating `Token` objects from the input.
public Token	nextToken() Return a `Token` object from your input stream (usually a `CharStream`).
public void	setTokenFactory(TokenFactory<?> The `TokenFactory` to use for creating tokens. factory) Set the `TokenFactory` this token source should use for creating `Token` objects from the input.

Method Detail

getCharPositionInLine	back to summary
public int getCharPositionInLine() Get the index into the current line for the current position in the input stream. The first character on a line has position 0. Returns:int The line number for the current position in the input stream, or -1 if the current token source does not track character positions.

getCharPositionInLine

back to summary

public int getCharPositionInLine()

Get the index into the current line for the current position in the input stream. The first character on a line has position 0.

Returns:int: The line number for the current position in the input stream, or -1 if the current token source does not track character positions.

getInputStream back to summary

getInputStream	back to summary
public CharStream getInputStream() Get the `CharStream` from which this token source is currently providing tokens. Returns:CharStream The `CharStream` associated with the current position in the input, or `null` if no input stream is available for the token source.

public CharStream getInputStream()

Get the CharStream from which this token source is currently providing tokens.

Returns:CharStream: The CharStream associated with the current position in the input, or null if no input stream is available for the token source.

getLine	back to summary
public int getLine() Get the line number for the current position in the input stream. The first line in the input is line 1. Returns:int The line number for the current position in the input stream, or 0 if the current token source does not track line numbers.

getLine

back to summary

public int getLine()

Get the line number for the current position in the input stream. The first line in the input is line 1.

Returns:int: The line number for the current position in the input stream, or 0 if the current token source does not track line numbers.

getSourceName	back to summary
public String getSourceName() Gets the name of the underlying input source. This method returns a non-null, non-empty string. If such a name is not known, this method returns `IntStream#UNKNOWN_SOURCE_NAME`.

getTokenFactory back to summary

getTokenFactory	back to summary
public TokenFactory<?> getTokenFactory() Gets the `TokenFactory` this token source is currently using for creating `Token` objects from the input. Returns:TokenFactory<?> The `TokenFactory` currently used by this token source.

public TokenFactory<?> getTokenFactory()

Gets the TokenFactory this token source is currently using for creating Token objects from the input.

Returns:TokenFactory<?>: The TokenFactory currently used by this token source.

nextToken	back to summary
public Token nextToken() Return a `Token` object from your input stream (usually a `CharStream`). Do not fail/return upon lexing error; keep chewing on the characters until you get a good one; errors are not passed through to the parser.

setTokenFactory back to summary

setTokenFactory	back to summary
public void setTokenFactory(TokenFactory<?> factory) Set the `TokenFactory` this token source should use for creating `Token` objects from the input. Parameters factory:TokenFactory<?> The `TokenFactory` to use for creating tokens.

public void setTokenFactory(TokenFactory<?> factory)

Set the TokenFactory this token source should use for creating Token objects from the input.

Parameters

factory:TokenFactory<?>: The TokenFactory to use for creating tokens.

public Interface TokenSource

Method Summary

Method Detail