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

Class ConditionalBackReferenceGroup

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.QuantifiableTerm

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

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

All Implemented Interfaces:

AbstractState<Term,ASTTransition>, RegexASTVisitorIterable, JsonConvertible

public final class ConditionalBackReferenceGroup
extends Group

Conditional back-reference groups represent the following construct found, e.g., in Python:

(?(group_name)then_branch|else_branch

Every conditional back-reference group has exactly 2 alternatives. The first alternative can only be taken if the referenced group was matched and the second alternative can be taken only if the referenced group was *not* matched.

Constructor Summary

Constructors

Constructor and Description
ConditionalBackReferenceGroup(int referencedGroupNumber) Creates an empty conditional back-reference group.

Method Summary

Modifier and Type	Method and Description
ConditionalBackReferenceGroup	copy(RegexAST ast) Copy this node only, without any child nodes.
ConditionalBackReferenceGroup	copyRecursive(RegexAST ast, CompilationBuffer compilationBuffer) Recursively copy this subtree.
boolean	equalsSemantic(RegexASTNode obj, boolean ignoreQuantifier)
int	getReferencedGroupNumber() Returns the index of the capture group that is referenced by this conditional expression.
JsonValue	toJson()
String	toString()

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

add, addSequence, alternativesToString, clearGroupNumber, getAlternatives, getBoundaryIndexEnd, getBoundaryIndexStart, getEnclosedCaptureGroupsHigh, getEnclosedCaptureGroupsLow, getFirstAlternative, getGroupNumber, getLastAlternative, groupNumberToBoundaryIndexEnd, groupNumberToBoundaryIndexStart, hasEnclosedCaptureGroups, insertFirst, isAlwaysZeroWidth, isCapturing, isEmpty, isLiteral, isLocalFlags, isLoop, isUnrollingCandidate, loopToString, removeLastSequence, resetVisitorIterator, setAlternatives, setEnclosedCaptureGroupsHigh, setEnclosedCaptureGroupsLow, setGroupNumber, setLocalFlags, setLoop, size, visitorGetNext, visitorHasNext

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

equalsSemantic, getQuantifier, getSubTreeParent, hasNotUnrolledQuantifier, hasQuantifier, quantifierToString, setQuantifier

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

getSeqIndex, setSeqIndex

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

asAtomicGroup, asBackReference, asCharacterClass, asConditionalBackReferenceGroup, asGroup, asLookAheadAssertion, asLookAroundAssertion, asLookBehindAssertion, asMatchFound, asPositionAssertion, asQuantifiableTerm, asSequence, asSubtreeRootNode, astNodeId, endsWithDollar, getFlags, getId, getMaxPath, getMinPath, getParent, getPrefixLengthMax, getPrefixLengthMin, hasBackReferences, hasCaptureGroups, hasCaret, hasDollar, hasEmptyGuard, hasLookAheads, hasLookBehinds, hasLoops, hasQuantifiers, hasVariablePrefixLength, idInitialized, incMaxPath, incMaxPath, incMinPath, incMinPath, isAtomicGroup, isBackReference, isCaret, isCharacterClass, isConditionalBackReferenceGroup, isDead, isDollar, 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, setPrefixLengthMax, setPrefixLengthMin, setStartsWithCaret, setStartsWithCaret, startsWithCaret, toJson, toStringWithID

Methods inherited from class java.lang.Object

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

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

getId

Constructor Detail

ConditionalBackReferenceGroup

public ConditionalBackReferenceGroup(int referencedGroupNumber)

Creates an empty conditional back-reference group. It should later be filled with exactly 2 Sequences as its alternatives.

Parameters:

referencedGroupNumber - The number of the capture group referenced in the condition.

Method Detail

getReferencedGroupNumber

public int getReferencedGroupNumber()

Returns the index of the capture group that is referenced by this conditional expression.

copy

public ConditionalBackReferenceGroup copy(RegexAST ast)

Description copied from class: RegexASTNode

Copy this node only, without any child nodes. The ID and minPath of the copied nodes is left unset.

Overrides:

copy in class Group

Parameters:

ast - RegexAST the node should belong to.

Returns:

A shallow copy of this node.

copyRecursive

public ConditionalBackReferenceGroup copyRecursive(RegexAST ast,
                                                   CompilationBuffer compilationBuffer)

Description copied from class: RegexASTNode

Recursively copy this subtree. This method should be used instead of CopyVisitor if the copying process is required to be thread-safe. The ID and minPath of the copied nodes is left unset.

Overrides:

copyRecursive in class Group

Parameters:

ast - RegexAST the new nodes should belong to.

Returns:

A deep copy of this node.

equalsSemantic

public boolean equalsSemantic(RegexASTNode obj,
                              boolean ignoreQuantifier)

Overrides:

equalsSemantic in class Group

toString

public String toString()

Overrides:

toString in class Group

toJson

public JsonValue toJson()

Specified by:

toJson in interface JsonConvertible

Overrides:

toJson in class Group