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

Class LookAroundAssertion

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.RegexASTSubtreeRootNode

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

All Implemented Interfaces:

IndexedState, RegexASTVisitorIterable, JsonConvertible

Direct Known Subclasses:

LookAheadAssertion, LookBehindAssertion

public abstract class LookAroundAssertion
extends RegexASTSubtreeRootNode

An assertion that succeeds depending on whether or not text surrounding the current position matches a given regular expression.

See its two subclasses, LookAheadAssertion and LookBehindAssertion.

Field Summary

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

FLAG_CHARACTER_CLASS_WAS_SINGLE_CHAR, FLAG_EMPTY_GUARD, FLAG_GROUP_EXPANDED_QUANTIFIER, FLAG_GROUP_LOOP, FLAG_HAS_LOOPS, FLAG_LOOK_AROUND_NEGATED

Method Summary

Modifier and Type	Method and Description
boolean	isNegated() Indicates whether this is a negative lookaround assertion (written as (?!...) (?<!...)) or a positive one (written as (?=...) or (?<=)).
void	setNegated(boolean negated)

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

copy, getGroup, getMatchFound, getPrefix, resetVisitorIterator, setGroup, setMatchFound, toJson, toString, visitorGetNext, visitorHasNext

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

equalsSemantic, equalsSemantic, getQuantifier, getSeqIndex, getSubTreeParent, hasQuantifier, quantifierToString, setQuantifier, setSeqIndex

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

astNodeId, endsWithDollar, getId, getMaxPath, getMinPath, getParent, hasEmptyGuard, hasLoops, idInitialized, incMaxPath, incMaxPath, incMinPath, incMinPath, isDead, isFlagSet, isInLookAheadAssertion, isInLookBehindAssertion, isPrefix, markAsDead, setEmptyGuard, setEndsWithDollar, setEndsWithDollar, setFlag, setFlag, setHasLoops, setHasLoops, setId, setMaxPath, setMinPath, setParent, setPrefix, setStartsWithCaret, setStartsWithCaret, startsWithCaret, 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.util.json.JsonConvertible

toJson

Method Detail

isNegated

public boolean isNegated()

Indicates whether this is a negative lookaround assertion (written as (?!...) (?<!...)) or a positive one (written as (?=...) or (?<=)).

Positive lookaround assertions match if and only if the text around the current position matches the contents of the assertion. Negative lookaround assertions match if and only if the text around the current position does not match the contents of the assertion.

setNegated

public void setNegated(boolean negated)