Class MultiCharacterCaseFolding

java.lang.Object

com.oracle.truffle.regex.tregex.parser.MultiCharacterCaseFolding

public class MultiCharacterCaseFolding
extends Object

Constructor Summary

Constructors

Constructor	Description
MultiCharacterCaseFolding()

Method Summary

Modifier and Type	Method	Description
static void	caseClosure(CaseFoldData.CaseFoldAlgorithm algorithm, CodePointSetAccumulator charClass, CodePointSetAccumulator tmp, BiPredicate<Integer,Integer> filter, CodePointSet allowedCodePoints, boolean transitiveEquivalence)	This method modifies charClass to contains its closure on case mapping.
static List<org.graalvm.collections.Pair<Integer,int[]>>	caseClosureMultiCodePoint(CaseFoldData.CaseFoldAlgorithm algorithm, CodePointSetAccumulator charClass)	Finds any characters in charClass that have multi-codepoint expansions.
static int[]	caseFold(CaseFoldData.CaseFoldAlgorithm algorithm, int codePoint)
static OracleDBCharClassTrieNode	caseFoldUnfoldString(CaseFoldData.CaseFoldAlgorithm algorithm, int[] codepoints, CodePointSet encodingRange, boolean dropAsciiOnStart, boolean transitiveEquivalence, RegexASTBuilder astBuilder, OracleDBCharClassTrieNode root, CompilationBuffer compilationBuffer)	Appends to the astBuilder a matcher that matches all case variants of the input string.
static boolean	equalsIgnoreCase(CaseFoldData.CaseFoldAlgorithm algorithm, int codePointA, int codePointB)

Methods inherited from class java.lang.Object

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

Constructor Details

MultiCharacterCaseFolding

public MultiCharacterCaseFolding()

Method Details

caseFoldUnfoldString

public static OracleDBCharClassTrieNode caseFoldUnfoldString(CaseFoldData.CaseFoldAlgorithm algorithm,
 int[] codepoints,
 CodePointSet encodingRange,
 boolean dropAsciiOnStart,
 boolean transitiveEquivalence,
 RegexASTBuilder astBuilder,
 OracleDBCharClassTrieNode root,
 CompilationBuffer compilationBuffer)

Appends to the astBuilder a matcher that matches all case variants of the input string.

Parameters:

codepoints - the input string as an array of Unicode codepoints

encodingRange - the range of characters that we should limit ourselves to

dropAsciiOnStart - whether we should forbid ASCII characters on the first positions of the variants

transitiveEquivalence - whether to unconditionally include the case-folded version of every character in the generated expression. If this is set to false, case-folded characters that themselves fold to another character are not included in the expression. Example: suppose a character x case-folds to y, but y folds to z. If transitiveEquivalence is set to false, the generated expression will not include y.

astBuilder - where to append the matcher

root - add all matching strings to the given prefix tree

caseFold

public static int[] caseFold(CaseFoldData.CaseFoldAlgorithm algorithm,
 int codePoint)

caseClosure

public static void caseClosure(CaseFoldData.CaseFoldAlgorithm algorithm,
 CodePointSetAccumulator charClass,
 CodePointSetAccumulator tmp,
 BiPredicate<Integer,Integer> filter,
 CodePointSet allowedCodePoints,
 boolean transitiveEquivalence)

This method modifies charClass to contains its closure on case mapping.

caseClosureMultiCodePoint

public static List<org.graalvm.collections.Pair<Integer,int[]>> caseClosureMultiCodePoint(CaseFoldData.CaseFoldAlgorithm algorithm,
 CodePointSetAccumulator charClass)

Finds any characters in charClass that have multi-codepoint expansions.

Returns:

a list of pairs, with the first element being the expanded codepoint and the second element the expansion

equalsIgnoreCase

public static boolean equalsIgnoreCase(CaseFoldData.CaseFoldAlgorithm algorithm,
 int codePointA,
 int codePointB)