Package org.antlr.v4.runtime.tree

Class ParseTreeWalker

java.lang.Object

org.antlr.v4.runtime.tree.ParseTreeWalker

Direct Known Subclasses:

IterativeParseTreeWalker

public class ParseTreeWalker
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static ParseTreeWalker	DEFAULT

Constructor Summary

Constructors

Constructor	Description
ParseTreeWalker()

Method Summary

Modifier and Type	Method	Description
protected void	enterRule(ParseTreeListener listener, RuleNode r)	Enters a grammar rule by first triggering the generic event ParseTreeListener.enterEveryRule(org.antlr.v4.runtime.ParserRuleContext) then by triggering the event specific to the given parse tree node
protected void	exitRule(ParseTreeListener listener, RuleNode r)	Exits a grammar rule by first triggering the event specific to the given parse tree node then by triggering the generic event ParseTreeListener.exitEveryRule(org.antlr.v4.runtime.ParserRuleContext)
void	walk(ParseTreeListener listener, ParseTree t)	Performs a walk on the given parse tree starting at the root and going down recursively with depth-first search.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT

public static final ParseTreeWalker DEFAULT

Constructor Detail

ParseTreeWalker

public ParseTreeWalker()

Method Detail

walk

public void walk(ParseTreeListener listener,
                 ParseTree t)

Performs a walk on the given parse tree starting at the root and going down recursively with depth-first search. On each node, enterRule(org.antlr.v4.runtime.tree.ParseTreeListener, org.antlr.v4.runtime.tree.RuleNode) is called before recursively walking down into child nodes, then exitRule(org.antlr.v4.runtime.tree.ParseTreeListener, org.antlr.v4.runtime.tree.RuleNode) is called after the recursive call to wind up.

Parameters:

listener - The listener used by the walker to process grammar rules

t - The parse tree to be walked on

enterRule

protected void enterRule(ParseTreeListener listener,
                         RuleNode r)

Enters a grammar rule by first triggering the generic event ParseTreeListener.enterEveryRule(org.antlr.v4.runtime.ParserRuleContext) then by triggering the event specific to the given parse tree node

Parameters:

listener - The listener responding to the trigger events

r - The grammar rule containing the rule context

exitRule

protected void exitRule(ParseTreeListener listener,
                        RuleNode r)

Exits a grammar rule by first triggering the event specific to the given parse tree node then by triggering the generic event ParseTreeListener.exitEveryRule(org.antlr.v4.runtime.ParserRuleContext)

Parameters:

listener - The listener responding to the trigger events

r - The grammar rule containing the rule context