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script-astra/Android/Sdk/sources/android-35/android/icu/impl/UTS46.java

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2025-01-20 15:15:20 +00:00
/* GENERATED SOURCE. DO NOT MODIFY. */
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2010-2014, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
*/
package android.icu.impl;
import java.util.EnumSet;
import android.icu.impl.Normalizer2Impl.UTF16Plus;
import android.icu.lang.UCharacter;
import android.icu.lang.UCharacterCategory;
import android.icu.lang.UCharacterDirection;
import android.icu.lang.UScript;
import android.icu.text.IDNA;
import android.icu.text.Normalizer2;
import android.icu.text.StringPrepParseException;
import android.icu.util.ICUException;
// Note about tests for IDNA.Error.DOMAIN_NAME_TOO_LONG:
//
// The domain name length limit is 255 octets in an internal DNS representation
// where the last ("root") label is the empty label
// represented by length byte 0 alone.
// In a conventional string, this translates to 253 characters, or 254
// if there is a trailing dot for the root label.
/**
* UTS #46 (IDNA2008) implementation.
* @author Markus Scherer
* @hide Only a subset of ICU is exposed in Android
*/
public final class UTS46 extends IDNA {
public UTS46(int options) {
this.options=options;
}
@Override
public StringBuilder labelToASCII(CharSequence label, StringBuilder dest, Info info) {
return process(label, true, true, dest, info);
}
@Override
public StringBuilder labelToUnicode(CharSequence label, StringBuilder dest, Info info) {
return process(label, true, false, dest, info);
}
@Override
public StringBuilder nameToASCII(CharSequence name, StringBuilder dest, Info info) {
process(name, false, true, dest, info);
if( dest.length()>=254 && !info.getErrors().contains(Error.DOMAIN_NAME_TOO_LONG) &&
isASCIIString(dest) &&
(dest.length()>254 || dest.charAt(253)!='.')
) {
addError(info, Error.DOMAIN_NAME_TOO_LONG);
}
return dest;
}
@Override
public StringBuilder nameToUnicode(CharSequence name, StringBuilder dest, Info info) {
return process(name, false, false, dest, info);
}
private static final Normalizer2 uts46Norm2=
Normalizer2.getInstance(null, "uts46", Normalizer2.Mode.COMPOSE); // uts46.nrm
final int options;
// Severe errors which usually result in a U+FFFD replacement character in the result string.
private static final EnumSet<Error> severeErrors=EnumSet.of(
Error.LEADING_COMBINING_MARK,
Error.DISALLOWED,
Error.PUNYCODE,
Error.LABEL_HAS_DOT,
Error.INVALID_ACE_LABEL);
private static boolean
isASCIIString(CharSequence dest) {
int length=dest.length();
for(int i=0; i<length; ++i) {
if(dest.charAt(i)>0x7f) {
return false;
}
}
return true;
}
// UTS #46 data for ASCII characters.
// The normalizer (using uts46.nrm) maps uppercase ASCII letters to lowercase
// and passes through all other ASCII characters.
// If USE_STD3_RULES is set, then non-LDH characters are disallowed
// using this data.
// The ASCII fastpath also uses this data.
// Values: -1=disallowed 0==valid 1==mapped (lowercase)
private static final byte asciiData[]={
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
// 002D..002E; valid # HYPHEN-MINUS..FULL STOP
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, -1,
// 0030..0039; valid # DIGIT ZERO..DIGIT NINE
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1, -1,
// 0041..005A; mapped # LATIN CAPITAL LETTER A..LATIN CAPITAL LETTER Z
-1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
// 0061..007A; valid # LATIN SMALL LETTER A..LATIN SMALL LETTER Z
-1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1
};
private StringBuilder
process(CharSequence src,
boolean isLabel, boolean toASCII,
StringBuilder dest,
Info info) {
// uts46Norm2.normalize() would do all of this error checking and setup,
// but with the ASCII fastpath we do not always call it, and do not
// call it first.
if(dest==src) {
throw new IllegalArgumentException();
}
// Arguments are fine, reset output values.
dest.delete(0, 0x7fffffff);
resetInfo(info);
int srcLength=src.length();
if(srcLength==0) {
addError(info, Error.EMPTY_LABEL);
return dest;
}
// ASCII fastpath
boolean disallowNonLDHDot=(options&USE_STD3_RULES)!=0;
int labelStart=0;
int i;
for(i=0;; ++i) {
if(i==srcLength) {
if(toASCII) {
if((i-labelStart)>63) {
addLabelError(info, Error.LABEL_TOO_LONG);
}
// There is a trailing dot if labelStart==i.
if(!isLabel && i>=254 && (i>254 || labelStart<i)) {
addError(info, Error.DOMAIN_NAME_TOO_LONG);
}
}
promoteAndResetLabelErrors(info);
return dest;
}
char c=src.charAt(i);
if(c>0x7f) {
break;
}
int cData=asciiData[c];
if(cData>0) {
dest.append((char)(c+0x20)); // Lowercase an uppercase ASCII letter.
} else if(cData<0 && disallowNonLDHDot) {
break; // Replacing with U+FFFD can be complicated for toASCII.
} else {
dest.append(c);
if(c=='-') { // hyphen
if(i==(labelStart+3) && src.charAt(i-1)=='-') {
// "??--..." is Punycode or forbidden.
++i; // '-' was copied to dest already
break;
}
if(i==labelStart) {
// label starts with "-"
addLabelError(info, Error.LEADING_HYPHEN);
}
if((i+1)==srcLength || src.charAt(i+1)=='.') {
// label ends with "-"
addLabelError(info, Error.TRAILING_HYPHEN);
}
} else if(c=='.') { // dot
if(isLabel) {
// Replacing with U+FFFD can be complicated for toASCII.
++i; // '.' was copied to dest already
break;
}
if(i==labelStart) {
addLabelError(info, Error.EMPTY_LABEL);
}
if(toASCII && (i-labelStart)>63) {
addLabelError(info, Error.LABEL_TOO_LONG);
}
promoteAndResetLabelErrors(info);
labelStart=i+1;
}
}
}
promoteAndResetLabelErrors(info);
processUnicode(src, labelStart, i, isLabel, toASCII, dest, info);
if( isBiDi(info) && !hasCertainErrors(info, severeErrors) &&
(!isOkBiDi(info) || (labelStart>0 && !isASCIIOkBiDi(dest, labelStart)))
) {
addError(info, Error.BIDI);
}
return dest;
}
private StringBuilder
processUnicode(CharSequence src,
int labelStart, int mappingStart,
boolean isLabel, boolean toASCII,
StringBuilder dest,
Info info) {
if(mappingStart==0) {
uts46Norm2.normalize(src, dest);
} else {
uts46Norm2.normalizeSecondAndAppend(dest, src.subSequence(mappingStart, src.length()));
}
boolean doMapDevChars=
toASCII ? (options&NONTRANSITIONAL_TO_ASCII)==0 :
(options&NONTRANSITIONAL_TO_UNICODE)==0;
int destLength=dest.length();
int labelLimit=labelStart;
while(labelLimit<destLength) {
char c=dest.charAt(labelLimit);
if(c=='.' && !isLabel) {
int labelLength=labelLimit-labelStart;
int newLength=processLabel(dest, labelStart, labelLength,
toASCII, info);
promoteAndResetLabelErrors(info);
destLength+=newLength-labelLength;
labelLimit=labelStart+=newLength+1;
continue;
} else if(c<0xdf) {
// pass
} else if(c<=0x200d && (c==0xdf || c==0x3c2 || c>=0x200c)) {
setTransitionalDifferent(info);
if(doMapDevChars) {
destLength=mapDevChars(dest, labelStart, labelLimit);
// All deviation characters have been mapped, no need to check for them again.
doMapDevChars=false;
// Do not increment labelLimit in case c was removed.
continue;
}
} else if(Character.isSurrogate(c)) {
if(UTF16Plus.isSurrogateLead(c) ?
(labelLimit+1)==destLength ||
!Character.isLowSurrogate(dest.charAt(labelLimit+1)) :
labelLimit==labelStart ||
!Character.isHighSurrogate(dest.charAt(labelLimit-1))) {
// Map an unpaired surrogate to U+FFFD before normalization so that when
// that removes characters we do not turn two unpaired ones into a pair.
addLabelError(info, Error.DISALLOWED);
dest.setCharAt(labelLimit, '\ufffd');
}
}
++labelLimit;
}
// Permit an empty label at the end (0<labelStart==labelLimit==destLength is ok)
// but not an empty label elsewhere nor a completely empty domain name.
// processLabel() sets UIDNA_ERROR_EMPTY_LABEL when labelLength==0.
if(0==labelStart || labelStart<labelLimit) {
processLabel(dest, labelStart, labelLimit-labelStart, toASCII, info);
promoteAndResetLabelErrors(info);
}
return dest;
}
// returns the new dest.length()
private int
mapDevChars(StringBuilder dest, int labelStart, int mappingStart) {
int length=dest.length();
boolean didMapDevChars=false;
for(int i=mappingStart; i<length;) {
char c=dest.charAt(i);
switch(c) {
case 0xdf:
// Map sharp s to ss.
didMapDevChars=true;
dest.setCharAt(i++, 's');
dest.insert(i++, 's');
++length;
break;
case 0x3c2: // Map final sigma to nonfinal sigma.
didMapDevChars=true;
dest.setCharAt(i++, '\u03c3');
break;
case 0x200c: // Ignore/remove ZWNJ.
case 0x200d: // Ignore/remove ZWJ.
didMapDevChars=true;
dest.delete(i, i+1);
--length;
break;
default:
++i;
break;
}
}
if(didMapDevChars) {
// Mapping deviation characters might have resulted in an un-NFC string.
// We could use either the NFC or the UTS #46 normalizer.
// By using the UTS #46 normalizer again, we avoid having to load a second .nrm data file.
String normalized=uts46Norm2.normalize(dest.subSequence(labelStart, dest.length()));
dest.replace(labelStart, 0x7fffffff, normalized);
return dest.length();
}
return length;
}
// Replace the label in dest with the label string, if the label was modified.
// If label==dest then the label was modified in-place and labelLength
// is the new label length, different from label.length().
// If label!=dest then labelLength==label.length().
// Returns labelLength (= the new label length).
private static int
replaceLabel(StringBuilder dest, int destLabelStart, int destLabelLength,
CharSequence label, int labelLength) {
if(label!=dest) {
dest.delete(destLabelStart, destLabelStart+destLabelLength).insert(destLabelStart, label);
// or dest.replace(destLabelStart, destLabelStart+destLabelLength, label.toString());
// which would create a String rather than moving characters in the StringBuilder.
}
return labelLength;
}
// returns the new label length
private int
processLabel(StringBuilder dest,
int labelStart, int labelLength,
boolean toASCII,
Info info) {
StringBuilder fromPunycode;
StringBuilder labelString;
int destLabelStart=labelStart;
int destLabelLength=labelLength;
boolean wasPunycode;
if( labelLength>=4 &&
dest.charAt(labelStart)=='x' && dest.charAt(labelStart+1)=='n' &&
dest.charAt(labelStart+2)=='-' && dest.charAt(labelStart+3)=='-'
) {
// Label starts with "xn--", try to un-Punycode it.
// In IDNA2008, labels like "xn--" (decodes to an empty string) and
// "xn--ASCII-" (decodes to just "ASCII") fail the round-trip validation from
// comparing the ToUnicode input with the back-to-ToASCII output.
// They are alternate encodings of the respective ASCII labels.
// Ignore "xn---" here: It will fail Punycode.decode() which logically comes before
// the round-trip verification.
if(labelLength==4 || (labelLength>5 && dest.charAt(labelStart+labelLength-1)=='-')) {
addLabelError(info, Error.INVALID_ACE_LABEL);
return markBadACELabel(dest, labelStart, labelLength, toASCII, info);
}
wasPunycode=true;
try {
fromPunycode=Punycode.decode(dest.subSequence(labelStart+4, labelStart+labelLength), null);
} catch (StringPrepParseException e) {
addLabelError(info, Error.PUNYCODE);
return markBadACELabel(dest, labelStart, labelLength, toASCII, info);
}
// Check for NFC, and for characters that are not
// valid or deviation characters according to the normalizer.
// If there is something wrong, then the string will change.
// Note that the normalizer passes through non-LDH ASCII and deviation characters.
// Deviation characters are ok in Punycode even in transitional processing.
// In the code further below, if we find non-LDH ASCII and we have UIDNA_USE_STD3_RULES
// then we will set UIDNA_ERROR_INVALID_ACE_LABEL there too.
boolean isValid=uts46Norm2.isNormalized(fromPunycode);
if(!isValid) {
addLabelError(info, Error.INVALID_ACE_LABEL);
return markBadACELabel(dest, labelStart, labelLength, toASCII, info);
}
labelString=fromPunycode;
labelStart=0;
labelLength=fromPunycode.length();
} else {
wasPunycode=false;
labelString=dest;
}
// Validity check
if(labelLength==0) {
addLabelError(info, Error.EMPTY_LABEL);
return replaceLabel(dest, destLabelStart, destLabelLength, labelString, labelLength);
}
// labelLength>0
if(labelLength>=4 && labelString.charAt(labelStart+2)=='-' && labelString.charAt(labelStart+3)=='-') {
// label starts with "??--"
addLabelError(info, Error.HYPHEN_3_4);
}
if(labelString.charAt(labelStart)=='-') {
// label starts with "-"
addLabelError(info, Error.LEADING_HYPHEN);
}
if(labelString.charAt(labelStart+labelLength-1)=='-') {
// label ends with "-"
addLabelError(info, Error.TRAILING_HYPHEN);
}
// If the label was not a Punycode label, then it was the result of
// mapping, normalization and label segmentation.
// If the label was in Punycode, then we mapped it again above
// and checked its validity.
// Now we handle the STD3 restriction to LDH characters (if set)
// and we look for U+FFFD which indicates disallowed characters
// in a non-Punycode label or U+FFFD itself in a Punycode label.
// We also check for dots which can come from the input to a single-label function.
// Ok to cast away const because we own the UnicodeString.
int i=labelStart;
int limit=labelStart+labelLength;
char oredChars=0;
// If we enforce STD3 rules, then ASCII characters other than LDH and dot are disallowed.
boolean disallowNonLDHDot=(options&USE_STD3_RULES)!=0;
do {
char c=labelString.charAt(i);
if(c<=0x7f) {
if(c=='.') {
addLabelError(info, Error.LABEL_HAS_DOT);
labelString.setCharAt(i, '\ufffd');
} else if(disallowNonLDHDot && asciiData[c]<0) {
addLabelError(info, Error.DISALLOWED);
labelString.setCharAt(i, '\ufffd');
}
} else {
oredChars|=c;
if(c==0xfffd) {
addLabelError(info, Error.DISALLOWED);
}
}
++i;
} while(i<limit);
// Check for a leading combining mark after other validity checks
// so that we don't report IDNA.Error.DISALLOWED for the U+FFFD from here.
int c;
// "Unsafe" is ok because unpaired surrogates were mapped to U+FFFD.
c=labelString.codePointAt(labelStart);
if((U_GET_GC_MASK(c)&U_GC_M_MASK)!=0) {
addLabelError(info, Error.LEADING_COMBINING_MARK);
labelString.setCharAt(labelStart, '\ufffd');
if(c>0xffff) {
// Remove c's trail surrogate.
labelString.deleteCharAt(labelStart+1);
--labelLength;
if(labelString==dest) {
--destLabelLength;
}
}
}
if(!hasCertainLabelErrors(info, severeErrors)) {
// Do contextual checks only if we do not have U+FFFD from a severe error
// because U+FFFD can make these checks fail.
if((options&CHECK_BIDI)!=0 && (!isBiDi(info) || isOkBiDi(info))) {
checkLabelBiDi(labelString, labelStart, labelLength, info);
}
if( (options&CHECK_CONTEXTJ)!=0 && (oredChars&0x200c)==0x200c &&
!isLabelOkContextJ(labelString, labelStart, labelLength)
) {
addLabelError(info, Error.CONTEXTJ);
}
if((options&CHECK_CONTEXTO)!=0 && oredChars>=0xb7) {
checkLabelContextO(labelString, labelStart, labelLength, info);
}
if(toASCII) {
if(wasPunycode) {
// Leave a Punycode label unchanged if it has no severe errors.
if(destLabelLength>63) {
addLabelError(info, Error.LABEL_TOO_LONG);
}
return destLabelLength;
} else if(oredChars>=0x80) {
// Contains non-ASCII characters.
StringBuilder punycode;
try {
punycode=Punycode.encode(labelString.subSequence(labelStart, labelStart+labelLength), null);
} catch (StringPrepParseException e) {
throw new ICUException(e); // unexpected
}
punycode.insert(0, "xn--");
if(punycode.length()>63) {
addLabelError(info, Error.LABEL_TOO_LONG);
}
return replaceLabel(dest, destLabelStart, destLabelLength,
punycode, punycode.length());
} else {
// all-ASCII label
if(labelLength>63) {
addLabelError(info, Error.LABEL_TOO_LONG);
}
}
}
} else {
// If a Punycode label has severe errors,
// then leave it but make sure it does not look valid.
if(wasPunycode) {
addLabelError(info, Error.INVALID_ACE_LABEL);
return markBadACELabel(dest, destLabelStart, destLabelLength, toASCII, info);
}
}
return replaceLabel(dest, destLabelStart, destLabelLength, labelString, labelLength);
}
private int
markBadACELabel(StringBuilder dest,
int labelStart, int labelLength,
boolean toASCII, Info info) {
boolean disallowNonLDHDot=(options&USE_STD3_RULES)!=0;
boolean isASCII=true;
boolean onlyLDH=true;
int limit=labelStart+labelLength;
// Start after the initial "xn--".
for(int i=labelStart+4; i<limit; ++i) {
char c=dest.charAt(i);
if(c<=0x7f) {
if(c=='.') {
addLabelError(info, Error.LABEL_HAS_DOT);
dest.setCharAt(i, '\ufffd');
isASCII=onlyLDH=false;
} else if(asciiData[c]<0) {
onlyLDH=false;
if(disallowNonLDHDot) {
dest.setCharAt(i, '\ufffd');
isASCII=false;
}
}
} else {
isASCII=onlyLDH=false;
}
}
if(onlyLDH) {
dest.insert(labelStart+labelLength, '\ufffd');
++labelLength;
} else {
if(toASCII && isASCII && labelLength>63) {
addLabelError(info, Error.LABEL_TOO_LONG);
}
}
return labelLength;
}
private static final int L_MASK=U_MASK(UCharacterDirection.LEFT_TO_RIGHT);
private static final int R_AL_MASK=
U_MASK(UCharacterDirection.RIGHT_TO_LEFT)|
U_MASK(UCharacterDirection.RIGHT_TO_LEFT_ARABIC);
private static final int L_R_AL_MASK=L_MASK|R_AL_MASK;
private static final int R_AL_AN_MASK=R_AL_MASK|U_MASK(UCharacterDirection.ARABIC_NUMBER);
private static final int EN_AN_MASK=
U_MASK(UCharacterDirection.EUROPEAN_NUMBER)|
U_MASK(UCharacterDirection.ARABIC_NUMBER);
private static final int R_AL_EN_AN_MASK=R_AL_MASK|EN_AN_MASK;
private static final int L_EN_MASK=L_MASK|U_MASK(UCharacterDirection.EUROPEAN_NUMBER);
private static final int ES_CS_ET_ON_BN_NSM_MASK=
U_MASK(UCharacterDirection.EUROPEAN_NUMBER_SEPARATOR)|
U_MASK(UCharacterDirection.COMMON_NUMBER_SEPARATOR)|
U_MASK(UCharacterDirection.EUROPEAN_NUMBER_TERMINATOR)|
U_MASK(UCharacterDirection.OTHER_NEUTRAL)|
U_MASK(UCharacterDirection.BOUNDARY_NEUTRAL)|
U_MASK(UCharacterDirection.DIR_NON_SPACING_MARK);
private static final int L_EN_ES_CS_ET_ON_BN_NSM_MASK=L_EN_MASK|ES_CS_ET_ON_BN_NSM_MASK;
private static final int R_AL_AN_EN_ES_CS_ET_ON_BN_NSM_MASK=R_AL_MASK|EN_AN_MASK|ES_CS_ET_ON_BN_NSM_MASK;
// We scan the whole label and check both for whether it contains RTL characters
// and whether it passes the BiDi Rule.
// In a BiDi domain name, all labels must pass the BiDi Rule, but we might find
// that a domain name is a BiDi domain name (has an RTL label) only after
// processing several earlier labels.
private void
checkLabelBiDi(CharSequence label, int labelStart, int labelLength, Info info) {
// IDNA2008 BiDi rule
// Get the directionality of the first character.
int c;
int i=labelStart;
c=Character.codePointAt(label, i);
i+=Character.charCount(c);
int firstMask=U_MASK(UBiDiProps.INSTANCE.getClass(c));
// 1. The first character must be a character with BIDI property L, R
// or AL. If it has the R or AL property, it is an RTL label; if it
// has the L property, it is an LTR label.
if((firstMask&~L_R_AL_MASK)!=0) {
setNotOkBiDi(info);
}
// Get the directionality of the last non-NSM character.
int lastMask;
int labelLimit=labelStart+labelLength;
for(;;) {
if(i>=labelLimit) {
lastMask=firstMask;
break;
}
c=Character.codePointBefore(label, labelLimit);
labelLimit-=Character.charCount(c);
int dir=UBiDiProps.INSTANCE.getClass(c);
if(dir!=UCharacterDirection.DIR_NON_SPACING_MARK) {
lastMask=U_MASK(dir);
break;
}
}
// 3. In an RTL label, the end of the label must be a character with
// BIDI property R, AL, EN or AN, followed by zero or more
// characters with BIDI property NSM.
// 6. In an LTR label, the end of the label must be a character with
// BIDI property L or EN, followed by zero or more characters with
// BIDI property NSM.
if( (firstMask&L_MASK)!=0 ?
(lastMask&~L_EN_MASK)!=0 :
(lastMask&~R_AL_EN_AN_MASK)!=0
) {
setNotOkBiDi(info);
}
// Add the directionalities of the intervening characters.
int mask=firstMask|lastMask;
while(i<labelLimit) {
c=Character.codePointAt(label, i);
i+=Character.charCount(c);
mask|=U_MASK(UBiDiProps.INSTANCE.getClass(c));
}
if((firstMask&L_MASK)!=0) {
// 5. In an LTR label, only characters with the BIDI properties L, EN,
// ES, CS, ET, ON, BN and NSM are allowed.
if((mask&~L_EN_ES_CS_ET_ON_BN_NSM_MASK)!=0) {
setNotOkBiDi(info);
}
} else {
// 2. In an RTL label, only characters with the BIDI properties R, AL,
// AN, EN, ES, CS, ET, ON, BN and NSM are allowed.
if((mask&~R_AL_AN_EN_ES_CS_ET_ON_BN_NSM_MASK)!=0) {
setNotOkBiDi(info);
}
// 4. In an RTL label, if an EN is present, no AN may be present, and
// vice versa.
if((mask&EN_AN_MASK)==EN_AN_MASK) {
setNotOkBiDi(info);
}
}
// An RTL label is a label that contains at least one character of type
// R, AL or AN. [...]
// A "BIDI domain name" is a domain name that contains at least one RTL
// label. [...]
// The following rule, consisting of six conditions, applies to labels
// in BIDI domain names.
if((mask&R_AL_AN_MASK)!=0) {
setBiDi(info);
}
}
// Special code for the ASCII prefix of a BiDi domain name.
// The ASCII prefix is all-LTR.
// IDNA2008 BiDi rule, parts relevant to ASCII labels:
// 1. The first character must be a character with BIDI property L [...]
// 5. In an LTR label, only characters with the BIDI properties L, EN,
// ES, CS, ET, ON, BN and NSM are allowed.
// 6. In an LTR label, the end of the label must be a character with
// BIDI property L or EN [...]
// UTF-16 version, called for mapped ASCII prefix.
// Cannot contain uppercase A-Z.
// s[length-1] must be the trailing dot.
private static boolean
isASCIIOkBiDi(CharSequence s, int length) {
int labelStart=0;
for(int i=0; i<length; ++i) {
char c=s.charAt(i);
if(c=='.') { // dot
if(i>labelStart) {
c=s.charAt(i-1);
if(!('a'<=c && c<='z') && !('0'<=c && c<='9')) {
// Last character in the label is not an L or EN.
return false;
}
}
labelStart=i+1;
} else if(i==labelStart) {
if(!('a'<=c && c<='z')) {
// First character in the label is not an L.
return false;
}
} else {
if(c<=0x20 && (c>=0x1c || (9<=c && c<=0xd))) {
// Intermediate character in the label is a B, S or WS.
return false;
}
}
}
return true;
}
private boolean
isLabelOkContextJ(CharSequence label, int labelStart, int labelLength) {
// [IDNA2008-Tables]
// 200C..200D ; CONTEXTJ # ZERO WIDTH NON-JOINER..ZERO WIDTH JOINER
int labelLimit=labelStart+labelLength;
for(int i=labelStart; i<labelLimit; ++i) {
if(label.charAt(i)==0x200c) {
// Appendix A.1. ZERO WIDTH NON-JOINER
// Rule Set:
// False;
// If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
// If RegExpMatch((Joining_Type:{L,D})(Joining_Type:T)*\u200C
// (Joining_Type:T)*(Joining_Type:{R,D})) Then True;
if(i==labelStart) {
return false;
}
int c;
int j=i;
c=Character.codePointBefore(label, j);
j-=Character.charCount(c);
if(uts46Norm2.getCombiningClass(c)==9) {
continue;
}
// check precontext (Joining_Type:{L,D})(Joining_Type:T)*
for(;;) {
/* UJoiningType */ int type=UBiDiProps.INSTANCE.getJoiningType(c);
if(type==UCharacter.JoiningType.TRANSPARENT) {
if(j==0) {
return false;
}
c=Character.codePointBefore(label, j);
j-=Character.charCount(c);
} else if(type==UCharacter.JoiningType.LEFT_JOINING || type==UCharacter.JoiningType.DUAL_JOINING) {
break; // precontext fulfilled
} else {
return false;
}
}
// check postcontext (Joining_Type:T)*(Joining_Type:{R,D})
for(j=i+1;;) {
if(j==labelLimit) {
return false;
}
c=Character.codePointAt(label, j);
j+=Character.charCount(c);
/* UJoiningType */ int type=UBiDiProps.INSTANCE.getJoiningType(c);
if(type==UCharacter.JoiningType.TRANSPARENT) {
// just skip this character
} else if(type==UCharacter.JoiningType.RIGHT_JOINING || type==UCharacter.JoiningType.DUAL_JOINING) {
break; // postcontext fulfilled
} else {
return false;
}
}
} else if(label.charAt(i)==0x200d) {
// Appendix A.2. ZERO WIDTH JOINER (U+200D)
// Rule Set:
// False;
// If Canonical_Combining_Class(Before(cp)) .eq. Virama Then True;
if(i==labelStart) {
return false;
}
int c=Character.codePointBefore(label, i);
if(uts46Norm2.getCombiningClass(c)!=9) {
return false;
}
}
}
return true;
}
private void
checkLabelContextO(CharSequence label, int labelStart, int labelLength, Info info) {
int labelEnd=labelStart+labelLength-1; // inclusive
int arabicDigits=0; // -1 for 066x, +1 for 06Fx
for(int i=labelStart; i<=labelEnd; ++i) {
int c=label.charAt(i);
if(c<0xb7) {
// ASCII fastpath
} else if(c<=0x6f9) {
if(c==0xb7) {
// Appendix A.3. MIDDLE DOT (U+00B7)
// Rule Set:
// False;
// If Before(cp) .eq. U+006C And
// After(cp) .eq. U+006C Then True;
if(!(labelStart<i && label.charAt(i-1)=='l' &&
i<labelEnd && label.charAt(i+1)=='l')) {
addLabelError(info, Error.CONTEXTO_PUNCTUATION);
}
} else if(c==0x375) {
// Appendix A.4. GREEK LOWER NUMERAL SIGN (KERAIA) (U+0375)
// Rule Set:
// False;
// If Script(After(cp)) .eq. Greek Then True;
if(!(i<labelEnd &&
UScript.GREEK==UScript.getScript(Character.codePointAt(label, i+1)))) {
addLabelError(info, Error.CONTEXTO_PUNCTUATION);
}
} else if(c==0x5f3 || c==0x5f4) {
// Appendix A.5. HEBREW PUNCTUATION GERESH (U+05F3)
// Rule Set:
// False;
// If Script(Before(cp)) .eq. Hebrew Then True;
//
// Appendix A.6. HEBREW PUNCTUATION GERSHAYIM (U+05F4)
// Rule Set:
// False;
// If Script(Before(cp)) .eq. Hebrew Then True;
if(!(labelStart<i &&
UScript.HEBREW==UScript.getScript(Character.codePointBefore(label, i)))) {
addLabelError(info, Error.CONTEXTO_PUNCTUATION);
}
} else if(0x660<=c /* && c<=0x6f9 */) {
// Appendix A.8. ARABIC-INDIC DIGITS (0660..0669)
// Rule Set:
// True;
// For All Characters:
// If cp .in. 06F0..06F9 Then False;
// End For;
//
// Appendix A.9. EXTENDED ARABIC-INDIC DIGITS (06F0..06F9)
// Rule Set:
// True;
// For All Characters:
// If cp .in. 0660..0669 Then False;
// End For;
if(c<=0x669) {
if(arabicDigits>0) {
addLabelError(info, Error.CONTEXTO_DIGITS);
}
arabicDigits=-1;
} else if(0x6f0<=c) {
if(arabicDigits<0) {
addLabelError(info, Error.CONTEXTO_DIGITS);
}
arabicDigits=1;
}
}
} else if(c==0x30fb) {
// Appendix A.7. KATAKANA MIDDLE DOT (U+30FB)
// Rule Set:
// False;
// For All Characters:
// If Script(cp) .in. {Hiragana, Katakana, Han} Then True;
// End For;
for(int j=labelStart;; j+=Character.charCount(c)) {
if(j>labelEnd) {
addLabelError(info, Error.CONTEXTO_PUNCTUATION);
break;
}
c=Character.codePointAt(label, j);
int script=UScript.getScript(c);
if(script==UScript.HIRAGANA || script==UScript.KATAKANA || script==UScript.HAN) {
break;
}
}
}
}
}
// TODO: make public(?) -- in C, these are public in uchar.h
private static int U_MASK(int x) {
return 1<<x;
}
private static int U_GET_GC_MASK(int c) {
return (1<<UCharacter.getType(c));
}
private static int U_GC_M_MASK=
U_MASK(UCharacterCategory.NON_SPACING_MARK)|
U_MASK(UCharacterCategory.ENCLOSING_MARK)|
U_MASK(UCharacterCategory.COMBINING_SPACING_MARK);
}
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