org.antlr.v4.runtime.tree.pattern

Class RuleTagToken

java.lang.Object

org.antlr.v4.runtime.tree.pattern.RuleTagToken

All Implemented Interfaces:

Token

public class RuleTagToken
extends Object
implements Token

A Token object representing an entire subtree matched by a parser rule; e.g., <expr>. These tokens are created for TagChunk chunks where the tag corresponds to a parser rule.

Field Summary

Fields inherited from interface org.antlr.v4.runtime.Token

DEFAULT_CHANNEL, EOF, EPSILON, HIDDEN_CHANNEL, INVALID_TYPE, MIN_USER_CHANNEL_VALUE, MIN_USER_TOKEN_TYPE

Constructor Summary

Constructors

Constructor and Description
RuleTagToken(String ruleName, int bypassTokenType) Constructs a new instance of RuleTagToken with the specified rule name and bypass token type and no label.
RuleTagToken(String ruleName, int bypassTokenType, String label) Constructs a new instance of RuleTagToken with the specified rule name, bypass token type, and label.

Method Summary

Methods

Modifier and Type	Method and Description
int	getChannel() Return the channel this token.
int	getCharPositionInLine() The index of the first character of this token relative to the beginning of the line at which it occurs, 0..n-1
CharStream	getInputStream() Gets the CharStream from which this token was derived.
String	getLabel() Gets the label associated with the rule tag.
int	getLine() The line number on which the 1st character of this token was matched, line=1..n
String	getRuleName() Gets the name of the rule associated with this rule tag.
int	getStartIndex() The starting character index of the token This method is optional; return -1 if not implemented.
int	getStopIndex() The last character index of the token.
String	getText() Get the text of the token.
int	getTokenIndex() An index from 0..n-1 of the token object in the input stream.
TokenSource	getTokenSource() Gets the TokenSource which created this token.
int	getType() Get the token type of the token
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RuleTagToken

public RuleTagToken(String ruleName,
            int bypassTokenType)

Constructs a new instance of RuleTagToken with the specified rule name and bypass token type and no label.

Parameters:

ruleName - The name of the parser rule this rule tag matches.

bypassTokenType - The bypass token type assigned to the parser rule.

Throws:

IllegalArgumentException - if ruleName is null or empty.

RuleTagToken

public RuleTagToken(String ruleName,
            int bypassTokenType,
            String label)

Constructs a new instance of RuleTagToken with the specified rule name, bypass token type, and label.

Parameters:

ruleName - The name of the parser rule this rule tag matches.

bypassTokenType - The bypass token type assigned to the parser rule.

label - The label associated with the rule tag, or null if the rule tag is unlabeled.

Throws:

IllegalArgumentException - if ruleName is null or empty.

Method Detail

getRuleName

public final String getRuleName()

Gets the name of the rule associated with this rule tag.

Returns:

The name of the parser rule associated with this rule tag.

getLabel

public final String getLabel()

Gets the label associated with the rule tag.

Returns:

The name of the label associated with the rule tag, or null if this is an unlabeled rule tag.

getChannel

public int getChannel()

Return the channel this token. Each token can arrive at the parser on a different channel, but the parser only "tunes" to a single channel. The parser ignores everything not on DEFAULT_CHANNEL.

Rule tag tokens are always placed on the Token.DEFAULT_CHANNEL.

Specified by:

getChannel in interface Token

getText

public String getText()

Get the text of the token.

This method returns the rule tag formatted with < and > delimiters.

Specified by:

getText in interface Token

getType

public int getType()

Get the token type of the token

Rule tag tokens have types assigned according to the rule bypass transitions created during ATN deserialization.

Specified by:

getType in interface Token

getLine

public int getLine()

The line number on which the 1st character of this token was matched, line=1..n

The implementation for RuleTagToken always returns 0.

Specified by:

getLine in interface Token

getCharPositionInLine

public int getCharPositionInLine()

The index of the first character of this token relative to the beginning of the line at which it occurs, 0..n-1

The implementation for RuleTagToken always returns -1.

Specified by:

getCharPositionInLine in interface Token

getTokenIndex

public int getTokenIndex()

An index from 0..n-1 of the token object in the input stream. This must be valid in order to print token streams and use TokenRewriteStream. Return -1 to indicate that this token was conjured up since it doesn't have a valid index.

The implementation for RuleTagToken always returns -1.

Specified by:

getTokenIndex in interface Token

getStartIndex

public int getStartIndex()

The starting character index of the token This method is optional; return -1 if not implemented.

The implementation for RuleTagToken always returns -1.

Specified by:

getStartIndex in interface Token

getStopIndex

public int getStopIndex()

The last character index of the token. This method is optional; return -1 if not implemented.

The implementation for RuleTagToken always returns -1.

Specified by:

getStopIndex in interface Token

getTokenSource

public TokenSource getTokenSource()

Gets the TokenSource which created this token.

The implementation for RuleTagToken always returns null.

Specified by:

getTokenSource in interface Token

getInputStream

public CharStream getInputStream()

Gets the CharStream from which this token was derived.

The implementation for RuleTagToken always returns null.

Specified by:

getInputStream in interface Token

toString

public String toString()

The implementation for RuleTagToken returns a string of the form ruleName:bypassTokenType.

Overrides:

toString in class Object