A LanguageTag represents a language according to RFC 3066 and RFC 4646.
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#include <Soprano/LanguageTag>
Detailed Description
A LanguageTag represents a language according to RFC 3066 and RFC 4646.
- Author
- Greg Beauchesne greg_.nosp@m.b@vi.nosp@m.sion-.nosp@m.play.nosp@m..com
- Since
- 2.3
Definition at line 44 of file languagetag.h.
Member Enumeration Documentation
- Enumerator:
MatchFilterBasic |
Represents basic language filtering as described in RFC 3066 section 2.5 (or RFC 4647 section 3.3.1). Basic language filtering checks only that the range string is a prefix of a language tag and that the prefix is followed by "-" or the end of the string. Additionally, the language range "*" matches all tags.
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MatchFilterExtended |
Represents extended language filtering as described in RFC 4647 section 3.3.2. Extended language filtering breaks tags up into subtags and is permitted to skip subtags in the language tag in order to match parts of the range string.
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Definition at line 47 of file languagetag.h.
Flags for performing LanguageTag lookups.
- See Also
- lookup()
- Enumerator:
LookupFlagNone |
|
LookupFlagNoFallback |
Disables fallback behavior for lookup ranges.
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Definition at line 70 of file languagetag.h.
Constructor & Destructor Documentation
Soprano::LanguageTag::LanguageTag |
( |
| ) |
|
Default constructor. Creates an empty language tag.
Soprano::LanguageTag::LanguageTag |
( |
const LanguageTag & |
other | ) |
|
Copy constructor.
- Parameters
-
other | The language tag from which to copy |
Soprano::LanguageTag::LanguageTag |
( |
const char * |
tag | ) |
|
Creates a language tag.
- Parameters
-
tag | The language tag string |
Creates a language tag.
- Parameters
-
tag | The language tag string |
Soprano::LanguageTag::LanguageTag |
( |
const QString & |
tag | ) |
|
Creates a language tag.
- Parameters
-
tag | The language tag string |
Soprano::LanguageTag::LanguageTag |
( |
const QLocale & |
locale | ) |
|
|
explicit |
Creates a language tag from a QLocale. If the language is QLocale::C, then an empty LanguageTag is produced.
- Parameters
-
Soprano::LanguageTag::LanguageTag |
( |
QLocale::Language |
lang, |
|
|
QLocale::Country |
country = QLocale::AnyCountry |
|
) |
| |
Creates a language tag from a language and country. If lang is QLocale::C, then an empty LanguageTag is produced.
- Parameters
-
lang | the language code |
country | the country code |
Soprano::LanguageTag::~LanguageTag |
( |
| ) |
|
Member Function Documentation
Assigns other to this tag.
bool Soprano::LanguageTag::operator== |
( |
const LanguageTag & |
other | ) |
const |
Comparison operator. Language tag comparisons are case-insensitive.
- Returns
true
if this tag and other
are equal.
bool Soprano::LanguageTag::operator!= |
( |
const LanguageTag & |
other | ) |
const |
Comparison operator. Language tag comparisons are case-insensitive.
- Returns
true
if this tag and other
differ.
bool Soprano::LanguageTag::operator< |
( |
const LanguageTag & |
other | ) |
const |
Comparison operator.
- Returns
true
if this tag is lexically less than other
.
bool Soprano::LanguageTag::operator<= |
( |
const LanguageTag & |
other | ) |
const |
Comparison operator.
- Returns
true
if this tag is lexically less than or equal to other
.
bool Soprano::LanguageTag::operator> |
( |
const LanguageTag & |
other | ) |
const |
Comparison operator.
- Returns
true
if this tag is lexically greater than other
.
bool Soprano::LanguageTag::operator>= |
( |
const LanguageTag & |
other | ) |
const |
Comparison operator.
- Returns
true
if this tag is lexically greater than or equal to other
.
Match this language tag against range using the specified filtering scheme.
- Parameters
-
range | the range against which to match |
scheme | the filtering scheme to use |
- Returns
true
if this tag matches pattern, false
if not.
bool Soprano::LanguageTag::isEmpty |
( |
| ) |
const |
- Returns
true
if this language tag is empty.
bool Soprano::LanguageTag::isValid |
( |
| ) |
const |
Determines if this language tag is valid. A valid language tag is divided into subtags that are divided by "-". The tag must adhere the following rules:
- Each subtag is composed only of characters in the ASCII range [a-zA-Z0-9] (letters and digits), with the exception of the first subtag, which must be composed of letters only
- No subtags are empty
- No subtags are longer than 8 characters
- Single-character subtags cannot end the tag unless after a private use ("x") subtag (e.g. "en-x-i" and "en-x-abcd-i" are legal; "en-x", "en-i", and "en-i-abcd-g" are illegal)
- Returns
true
if this language tag is valid
- Returns
- the subtag parts that make up this language tag
QString Soprano::LanguageTag::toString |
( |
| ) |
const |
QString Soprano::LanguageTag::toPrettyString |
( |
| ) |
const |
Converts this LanguageTag to a string formatted according to the case rules in RFC 4647 section 4.4 (page 44).
- Returns
- the pretty string representation of this LanguageTag
QLocale Soprano::LanguageTag::toLocale |
( |
| ) |
const |
Converts this LanguageTag to a locale, using the primary language tag and first two-letter language subtag, if any. If the conversion could not be performed, then the "C" QLocale is returned.
- Returns
- the converted locale
- Note
- QLocale restricts the countries that can be paired with a particular language. If the language-country pair in this tag is not in the QLocale database, or if this language tag does not contain country information, then the most appropriate country will be used for the locale. For example, "de-US" (German as spoken in the United States) is not a valid combination, and the country would be changed to Germany.
Soprano::LanguageTag::operator QString |
( |
| ) |
const |
|
inline |
Compares a language tag against a list of language tags and selects the most suitable tag according to the rules of RFC 4647 Section 3.4.
The arguments consist of choices, a list of tags from which to select, and priority, a list of acceptable language ranges. Both lists must be sorted in descending order of preference.
The matching algorithm works as follows:
-
For each item in the priority list, the choices list is scanned for matches. The wildcard value "*" is ignored in lookup operations, as it would match any tag. If a match occurs, the lookup is complete and the matching choices list index is returned.
-
If no match has been found, the last subtag on the current priority item is truncated, and the choices list is scanned again. Single-character subtags are also truncated if they are at the end of the tag. This repeats until there are no subtags remaining. This fallback behavior can be skipped by specifying the LookupFlagsNoFallback flag.
-
If neither the current priority item nor any of its fallback values matched the choices list, then the next item in the priority list is considered according to the above steps.
-
If none of the priority items match the choices list, then a value < 0 is returned.
- Parameters
-
choices | the list of available language choices |
priority | the language priority list |
flags | flags for the lookup operation |
scheme | the matching scheme to use. RFC 4647 specifies that basic (MatchFilterBasic) processing should be used. |
- Returns
- the index of the matching language tag in choices, or < 0 if no tag matched.
The documentation for this class was generated from the following file:
- /var/build/temp/tmp.uqeujgDS9u/4.0-0-0/soprano/soprano-2.7.6+dfsg.1/soprano/languagetag.h