com.oracle.truffle.regex.tregex.parser.ast.visitors

Class DeleteVisitor

java.lang.Object

com.oracle.truffle.regex.tregex.parser.ast.visitors.RegexASTVisitor

com.oracle.truffle.regex.tregex.parser.ast.visitors.DepthFirstTraversalRegexASTVisitor

com.oracle.truffle.regex.tregex.parser.ast.visitors.DeleteVisitor

public class DeleteVisitor
extends DepthFirstTraversalRegexASTVisitor

A visitor used to maintain the state of cached RegexAST fields when removing parts of the AST.

Nodes can be removed from the AST simply by mutating the parent/child pointers. However, there are some cached values stored in RegexAST which would no longer have valid values. The DeleteVisitor is something you can run on nodes that you are removing from the AST in order to update the relevant fields of RegexAST.

See Also:

RegexAST.getNodeCount(), RegexAST.getReachableCarets(), RegexAST.getReachableDollars(), RegexAST.getLookBehinds()

Constructor Summary

Constructors

Constructor and Description
DeleteVisitor(RegexAST ast)

Method Summary

Modifier and Type	Method and Description
protected void	visit(BackReference backReference)
protected void	visit(CharacterClass characterClass)
protected void	visit(Group group)
protected void	visit(LookAheadAssertion assertion)
protected void	visit(LookBehindAssertion assertion)
protected void	visit(MatchFound matchFound)
protected void	visit(PositionAssertion assertion)
protected void	visit(Sequence sequence)

Methods inherited from class com.oracle.truffle.regex.tregex.parser.ast.visitors.DepthFirstTraversalRegexASTVisitor

init, isReverse, leave, leave, leave, leave, run, runReverse

Methods inherited from class com.oracle.truffle.regex.tregex.parser.ast.visitors.RegexASTVisitor

doLeave, doVisit

Methods inherited from class java.lang.Object

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

Constructor Detail

DeleteVisitor

public DeleteVisitor(RegexAST ast)

Method Detail

visit

protected void visit(BackReference backReference)

Overrides:

visit in class DepthFirstTraversalRegexASTVisitor

visit

protected void visit(Group group)

Overrides:

visit in class DepthFirstTraversalRegexASTVisitor

visit

protected void visit(Sequence sequence)

Overrides:

visit in class DepthFirstTraversalRegexASTVisitor

visit

protected void visit(PositionAssertion assertion)

Overrides:

visit in class DepthFirstTraversalRegexASTVisitor

visit

protected void visit(LookBehindAssertion assertion)

Overrides:

visit in class DepthFirstTraversalRegexASTVisitor

visit

protected void visit(LookAheadAssertion assertion)

Overrides:

visit in class DepthFirstTraversalRegexASTVisitor

visit

protected void visit(CharacterClass characterClass)

Overrides:

visit in class DepthFirstTraversalRegexASTVisitor

visit

protected void visit(MatchFound matchFound)

Overrides:

visit in class DepthFirstTraversalRegexASTVisitor