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8159337: Introduce a method in Locale class to return the language tags as per RFC 5646 convention

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Reviewed-by: naoto, rriggs
This commit is contained in:
Justin Lu 2023-05-09 17:15:06 +00:00
parent 3aff5eacbd
commit 82bcee76ea
3 changed files with 276 additions and 5 deletions
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55
src/java.base/share/classes/sun/util/locale/LanguageTag.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2010, 2020, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2010, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -34,7 +34,9 @@ package sun.util.locale;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.IllformedLocaleException;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.StringJoiner;
@ -59,7 +61,6 @@ public class LanguageTag {
private List<String> extlangs = Collections.emptyList(); // extlang subtags
private List<String> variants = Collections.emptyList(); // variant subtags
private List<String> extensions = Collections.emptyList(); // extensions
// Map contains legacy language tags and its preferred mappings from
// http://www.ietf.org/rfc/rfc5646.txt
// Keys are lower-case strings.
@ -208,7 +209,6 @@ public class LanguageTag {
tag.parseExtensions(itr, sts);
}
tag.parsePrivateuse(itr, sts);
if (!itr.isDone() && !sts.isError()) {
String s = itr.current();
sts.errorIndex = itr.currentStart();
@ -218,7 +218,6 @@ public class LanguageTag {
sts.errorMsg = "Invalid subtag: " + s;
}
}
return tag;
}
@ -414,6 +413,54 @@ public class LanguageTag {
return found;
}
public static String caseFoldTag(String tag) {
ParseStatus sts = new ParseStatus();
parse(tag, sts);
// Illegal tags
if (sts.errorMsg != null) {
throw new IllformedLocaleException(String.format("Ill formed tag:" +
" %s", sts.errorMsg));
}
// Legacy tags
String potentialLegacy = tag.toLowerCase(Locale.ROOT);
if (LEGACY.containsKey(potentialLegacy)) {
return LEGACY.get(potentialLegacy)[0];
}
// Non-legacy tags
StringBuilder bldr = new StringBuilder(tag.length());
String[] subtags = tag.split("-");
boolean privateFound = false;
boolean singletonFound = false;
boolean privUseVarFound = false;
for (int i = 0; i < subtags.length; i++) {
String subtag = subtags[i];
if (privUseVarFound) {
bldr.append(subtag);
} else if (i > 0 && isVariant(subtag) && !singletonFound && !privateFound) {
bldr.append(subtag);
} else if (i > 0 && isRegion(subtag) && !singletonFound && !privateFound) {
bldr.append(canonicalizeRegion(subtag));
} else if (i > 0 && isScript(subtag) && !singletonFound && !privateFound) {
bldr.append(canonicalizeScript(subtag));
// If subtag is not 2 letter, 4 letter, or variant
// under the right conditions, then it should be lower-case
} else {
if (isPrivateusePrefix(subtag)) {
privateFound = true;
} else if (isExtensionSingleton(subtag)) {
singletonFound = true;
} else if (subtag.equals(PRIVUSE_VARIANT_PREFIX)) {
privUseVarFound = true;
}
bldr.append(subtag.toLowerCase(Locale.ROOT));
}
if (i != subtags.length-1) {
bldr.append("-");
}
}
return bldr.substring(0);
}
public static LanguageTag parseLocale(BaseLocale baseLocale, LocaleExtensions localeExtensions) {
LanguageTag tag = new LanguageTag();