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

Class CharacterClass

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.CharacterClass

All Implemented Interfaces:

IndexedState, JsonConvertible

public class CharacterClass
extends Term

A Term that matches characters belonging to a specified set of characters.

Corresponds to the right-hand sides PatternCharacter, . and CharacterClass of the goal symbol Atom and the right-hand sides CharacterClassEscape and CharacterEscape of the goal symbol AtomEscape in the ECMAScript RegExp syntax.

Note that CharacterClass nodes and the CharSets that they rely on can only match characters from the Basic Multilingual Plane (and whose code point fits into 16-bit integers). Any term which matches characters outside of the Basic Multilingual Plane is expanded by RegexParser into a more complex expression which matches the individual code units that would make up the UTF-16 encoding of those characters.

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
void	addLookBehindEntry(RegexAST ast, Group lookBehindEntry)
CharacterClass	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, boolean ignoreQuantifier)
void	extractSingleChar(char[] literal, char[] mask, int i)
void	extractSingleChar(CharArrayBuffer literal, CharArrayBuffer mask)
CharSet	getCharSet() Returns the CharSet representing the set of characters that can be matched by this CharacterClass.
Set<Group>	getLookBehindEntries() Returns the (fixed-length) look-behind assertions whose first characters can match the same character as this node.
Sequence	getParent() Gets the syntactic parent of this AST node.
boolean	hasLookBehindEntries()
void	setCharSet(CharSet charSet)
void	setWasSingleChar()
void	setWasSingleChar(boolean value)
JsonValue	toJson()
String	toString()
boolean	wasSingleChar()

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

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, 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, toJson, toStringWithID

Methods inherited from class java.lang.Object

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

Method Detail

copy

public CharacterClass 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.

getParent

public Sequence getParent()

Description copied from class: RegexASTNode

Gets the syntactic parent of this AST node.

Overrides:

getParent in class RegexASTNode

getCharSet

public CharSet getCharSet()

Returns the CharSet representing the set of characters that can be matched by this CharacterClass.

setCharSet

public void setCharSet(CharSet charSet)

wasSingleChar

public boolean wasSingleChar()

setWasSingleChar

public void setWasSingleChar()

setWasSingleChar

public void setWasSingleChar(boolean value)

addLookBehindEntry

public void addLookBehindEntry(RegexAST ast,
                               Group lookBehindEntry)

hasLookBehindEntries

public boolean hasLookBehindEntries()

getLookBehindEntries

public Set<Group> getLookBehindEntries()

Returns the (fixed-length) look-behind assertions whose first characters can match the same character as this node. Note that the set contains the Group bodies of the LookBehindAssertion nodes, not the LookBehindAssertion nodes themselves.

extractSingleChar

public void extractSingleChar(CharArrayBuffer literal,
                              CharArrayBuffer mask)

extractSingleChar

public void extractSingleChar(char[] literal,
                              char[] mask,
                              int i)

equalsSemantic

public boolean equalsSemantic(RegexASTNode obj,
                              boolean ignoreQuantifier)

Specified by:

equalsSemantic in class Term

toString

public String toString()

Overrides:

toString in class Object

toJson

public JsonValue toJson()