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bcp-47-match
Advanced tools
Match BCP 47 language tags with “language ranges” per RFC 4647,
as done by the :lang()
pseudo-class in CSS, or the Accept-Language
HTTP
header.
Related to bcp-47
.
npm:
npm install bcp-47-match
var match = require('bcp-47-match')
var basic = match.basicFilter
var extended = match.extendedFilter
var lookup = match.lookup
var tags = ['en-GB', 'de-CH', 'en', 'de']
console.log(basic(tags, '*')) // => [ 'en-GB', 'de-CH', 'en', 'de' ]
console.log(basic(tags, 'en')) // => [ 'en-GB', 'en' ]
console.log(basic(tags, 'en-GB')) // => [ 'en-GB' ]
console.log(basic(tags, ['en-GB', 'en'])) // => [ 'en-GB', 'en' ]
console.log(basic(tags, 'jp')) // => []
console.log(extended(tags, '*')) // => [ 'en-GB', 'de-CH', 'en', 'de' ]
console.log(extended(tags, 'en')) // => [ 'en-GB', 'en' ]
console.log(extended(tags, 'en-GB')) // => [ 'en-GB' ]
console.log(extended(tags, '*-GB')) // => [ 'en-GB' ]
console.log(extended(tags, ['en-GB', 'en'])) // => [ 'en-GB', 'en' ]
console.log(extended(tags, 'jp')) // => []
console.log(lookup(tags, 'en')) // => 'en'
console.log(lookup(tags, 'en-GB')) // => 'en-GB'
console.log(lookup(tags, ['en-GB', 'en'])) // => 'en-GB'
console.log(lookup(tags, ['en', 'en-GB'])) // => 'en'
console.log(lookup(tags, 'jp')) // => undefined
match.basicFilter(tags[, ranges])
Match language tags to a list of simple ranges. Searches for matches between the first range and all tags, and continues with further ranges. Returns a list of matching tags in the order they matched.
Basic Filter | * | de | de-CH | de-DE | de-*-DE | *-CH |
---|---|---|---|---|---|---|
de | ✔︎ | ✔︎ | ||||
de-CH | ✔︎ | ✔︎ | ✔︎ | |||
de-CH-1996 | ✔︎ | ✔︎ | ✔︎ | |||
de-DE | ✔︎ | ✔︎ | ✔︎ | |||
de-DE-1996 | ✔︎ | ✔︎ | ✔︎ | |||
de-DE-x-goethe | ✔︎ | ✔︎ | ✔︎ | |||
de-Deva | ✔︎ | ✔︎ | ||||
de-Deva-DE | ✔︎ | ✔︎ | ||||
de-Latf-DE | ✔︎ | ✔︎ | ||||
de-Latn-DE | ✔︎ | ✔︎ | ||||
de-Latn-DE-1996 | ✔︎ | ✔︎ | ||||
de-x-DE | ✔︎ | ✔︎ | ||||
en | ✔︎ | |||||
en-GB | ✔︎ | |||||
zh | ✔︎ | |||||
zh-Hans | ✔︎ | |||||
zh-Hant | ✔︎ |
tags
(string
or Array.<string>
) — List of BCP-47 tagsranges
(string
or Array.<string>
) — List of RFC 4647
basic ranges
(aka, matching /^(\*|[a-z]{1,8}(-[a-z0-9]{1,8})*)$/i
)Array.<string>
— Possibly empty list of matching tags in the order they
matched.
match.extendedFilter(tags[, ranges])
Match language tags to a list of extended ranges. Searches for matches between the first range and all tags, and continues with further ranges.
Extended Filter | * | de | de-CH | de-DE | de-*-DE | *-CH |
---|---|---|---|---|---|---|
de | ✔︎ | ✔︎ | ||||
de-CH | ✔︎ | ✔︎ | ✔︎ | ✔︎ | ||
de-CH-1996 | ✔︎ | ✔︎ | ✔︎ | ✔︎ | ||
de-DE | ✔︎ | ✔︎ | ✔︎ | ✔︎ | ||
de-DE-1996 | ✔︎ | ✔︎ | ✔︎ | ✔︎ | ||
de-DE-x-goethe | ✔︎ | ✔︎ | ✔︎ | ✔︎ | ||
de-Deva | ✔︎ | ✔︎ | ||||
de-Deva-DE | ✔︎ | ✔︎ | ✔︎ | ✔︎ | ||
de-Latf-DE | ✔︎ | ✔︎ | ✔︎ | ✔︎ | ||
de-Latn-DE | ✔︎ | ✔︎ | ✔︎ | ✔︎ | ||
de-Latn-DE-1996 | ✔︎ | ✔︎ | ✔︎ | ✔︎ | ||
de-x-DE | ✔︎ | ✔︎ | ||||
en | ✔︎ | |||||
en-GB | ✔︎ | |||||
zh | ✔︎ | |||||
zh-Hans | ✔︎ | |||||
zh-Hant | ✔︎ |
tags
(string
or Array.<string>
) — List of BCP-47 tagsranges
(string
or Array.<string>
) — List of RFC 4647
extended ranges
(aka, matching /^(\*|[a-z]{1,8})(-(\*|[a-z0-9]{1,8}))*$/i
)Array.<string>
— Possibly empty list of matching tags in the order they
matched.
match.lookup(tags, ranges)
Find the best language tag that matches a list of ranges. Searches for a match between the first range and all tags, and continues with further ranges. Returns the first match, if any.
Lookup | * | de | de-CH | de-DE | de-*-DE | *-CH |
---|---|---|---|---|---|---|
de | ✔︎︎ | ✔︎︎ | ✔︎ | ✔︎ | ✔︎ | |
de-CH | ✔︎ | ✔︎ | ||||
de-CH-1996 | ✔︎ | |||||
de-DE | ✔︎ | ✔︎ | ||||
de-DE-1996 | ✔︎ | |||||
de-DE-x-goethe | ✔︎ | |||||
de-Deva | ✔︎ | |||||
de-Deva-DE | ✔︎ | |||||
de-Latf-DE | ✔︎ | |||||
de-Latn-DE | ✔︎ | |||||
de-Latn-DE-1996 | ✔︎ | |||||
de-x-DE | ✔︎ | |||||
en | ✔︎ | |||||
en-GB | ✔︎ | |||||
zh | ✔︎ | |||||
zh-Hans | ✔︎ | |||||
zh-Hant | ✔︎ |
tags
(string
or Array.<string>
) — List of BCP-47 tagsranges
(string
or Array.<string>
) — List of RFC 4647 basic ranges
(but *
is ignored)string?
— The first matching tag in tags
, or undefined
otherwise.
FAQs
Match BCP 47 language tags with language ranges per RFC 4647
The npm package bcp-47-match receives a total of 348,033 weekly downloads. As such, bcp-47-match popularity was classified as popular.
We found that bcp-47-match demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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