com.oracle.truffle.regex.tregex.matchers

Class BitSetMatcher

java.lang.Object

com.oracle.truffle.regex.tregex.matchers.CharMatcher

com.oracle.truffle.regex.tregex.matchers.InvertibleCharMatcher

com.oracle.truffle.regex.tregex.matchers.BitSetMatcher

public final class BitSetMatcher
extends InvertibleCharMatcher

Matcher that matches multiple characters with a common high byte using a bit set.
Example: characters တ, ဠ, ူ have a common high byte 0x10, so they are matched by this high byte and a bit set that matches 0x10, 0x20 and 0x30.

Method Summary

Modifier and Type	Method and Description
static InvertibleCharMatcher	create(boolean invert, int highByte, long[] bitSet) Constructs a new bit-set-based character matcher.
int	estimatedCost() Conservatively estimate the equivalent number of integer comparisons of calling CharMatcher.match(int).
long[]	getBitSet()
boolean	match(int c) Check if a given code point matches this CharMatcher.
String	toString()

Methods inherited from class com.oracle.truffle.regex.tregex.matchers.InvertibleCharMatcher

modifiersToString, result, result

Methods inherited from class java.lang.Object

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

Method Detail

create

public static InvertibleCharMatcher create(boolean invert,
                                           int highByte,
                                           long[] bitSet)

Constructs a new bit-set-based character matcher.

Parameters:

invert - see InvertibleCharMatcher.

highByte - the high byte common to all characters to match.

bitSet - the bit set to match the low byte of the characters to match.

Returns:

a new BitSetMatcher or a NullHighByteBitSetMatcher.

getBitSet

public long[] getBitSet()

match

public boolean match(int c)

Description copied from class: CharMatcher

Check if a given code point matches this CharMatcher.

Specified by:

match in class CharMatcher

Parameters:

c - any code point.

Returns:

true if the character matches.

See Also:

CompilerDirectives.isPartialEvaluationConstant(Object)

estimatedCost

public int estimatedCost()

Description copied from class: CharMatcher

Conservatively estimate the equivalent number of integer comparisons of calling CharMatcher.match(int).

Specified by:

estimatedCost in class CharMatcher

Returns:

the number of integer comparisons one call to CharMatcher.match(int) is roughly equivalent to. Array loads are treated as two comparisons.

toString

public String toString()

Overrides:

toString in class Object