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

Class PositionAssertion

java.lang.Object

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

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

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

All Implemented Interfaces:

AbstractState<Term,ASTTransition>, JsonConvertible

public class PositionAssertion
extends Term

An assertion that succeeds when encountered at the beginning or at the end of the string we are searching in.

Corresponds to the ^ and $ right-hand sides of the Assertion goal symbol in the ECMAScript RegExp syntax.

PositionAssertion nodes are also used for state sets of NFA initial states, which is why they can have a next-pointer (PositionAssertion.getNext()), see RegexAST.getNFAAnchoredInitialState(int).

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PositionAssertion.Type The position assertions supported by ECMAScript RegExps.

Field Summary

Fields

Modifier and Type	Field and Description
PositionAssertion.Type	type Indicates which position assertion this node represents.

Method Summary

Modifier and Type	Method and Description
PositionAssertion	copy(RegexAST ast, boolean recursive) Copy this node, in one of the following ways: if recursive is true, recursively copy this subtree.
boolean	equalsSemantic(RegexASTNode obj)
RegexASTNode	getNext()
boolean	isCaret()
boolean	isDollar()
void	setNext(RegexASTNode next)
JsonValue	toJson()
String	toString()

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

getSeqIndex, getSubTreeParent, setSeqIndex

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

asBackReference, asCharacterClass, asGroup, asLookAheadAssertion, asLookAroundAssertion, asLookBehindAssertion, asMatchFound, asPositionAssertion, asQuantifiableTerm, asSequence, astNodeId, endsWithDollar, getFlags, getId, getMaxPath, getMinPath, getParent, hasBackReferences, hasCaptureGroups, hasCaret, hasDollar, hasEmptyGuard, hasLookAheads, hasLookBehinds, hasLoops, hasQuantifiers, idInitialized, incMaxPath, incMaxPath, incMinPath, incMinPath, isBackReference, isCharacterClass, isDead, isExpandedQuantifier, isFlagSet, isGroup, isInLookAheadAssertion, isInLookBehindAssertion, isLookAheadAssertion, isLookAroundAssertion, isLookBehindAssertion, isMatchFound, isPositionAssertion, isPrefix, isQuantifiableTerm, isRoot, isSequence, isSubtreeRoot, markAsDead, setDead, setEmptyGuard, setEndsWithDollar, setEndsWithDollar, setExpandedQuantifier, setFlag, setFlag, setFlags, setHasBackReferences, setHasCaptureGroups, setHasCaret, setHasCaret, setHasDollar, setHasDollar, setHasLookAheads, setHasLookBehinds, setHasLoops, setHasLoops, setHasQuantifiers, setId, setMaxPath, setMinPath, setParent, setPrefix, setStartsWithCaret, setStartsWithCaret, startsWithCaret, toJson, toStringWithID

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.oracle.truffle.regex.tregex.automaton.AbstractState

getId

Field Detail

type

public final PositionAssertion.Type type

Indicates which position assertion this node represents.

Method Detail

copy

public PositionAssertion copy(RegexAST ast,
                              boolean recursive)

Description copied from class: RegexASTNode

Copy this node, in one of the following ways:

• if recursive is true, recursively copy this subtree. This method should be used instead of CopyVisitor if the copying process is required to be thread-safe.
• else, copy this node only, without any child nodes.

In both cases, the ID and minPath of the copied nodes is left unset.

Specified by:

copy in class Term

Parameters:

ast - RegexAST the new nodes should belong to.

Returns:

A shallow or deep copy of this node.

getNext

public RegexASTNode getNext()

setNext

public void setNext(RegexASTNode next)

isCaret

public boolean isCaret()

Overrides:

isCaret in class RegexASTNode

isDollar

public boolean isDollar()

Overrides:

isDollar in class RegexASTNode

equalsSemantic

public boolean equalsSemantic(RegexASTNode obj)

Specified by:

equalsSemantic in class RegexASTNode

toString

public String toString()

Overrides:

toString in class Object

toJson

public JsonValue toJson()