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Accept-Language.scala
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Accept-Language.scala
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/*
* Copyright 2013 http4s.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.http4s
package headers
import cats.data.NonEmptyList
import cats.parse.Parser
import org.typelevel.ci._
object `Accept-Language` {
def apply(head: LanguageTag, tail: LanguageTag*): `Accept-Language` =
apply(NonEmptyList(head, tail.toList))
def parse(s: String): ParseResult[`Accept-Language`] =
ParseResult.fromParser(parser, "Invalid Accept-Language header")(s)
private[http4s] val parser: Parser[`Accept-Language`] = {
import cats.parse.Parser.{char => ch, _}
import cats.parse.Rfc5234._
import org.http4s.internal.parsing.CommonRules.headerRep1
val languageTag =
((alpha.rep.void | charIn('*').void).string ~ (ch(
'-'
) *> (alpha | digit).rep.string).rep0 ~ QValue.parser).map { case ((main, sub), q) =>
LanguageTag(main, q, sub)
}
headerRep1(languageTag).map(tags => `Accept-Language`(tags.head, tags.tail: _*))
}
implicit val headerInstance: Header[`Accept-Language`, Header.Recurring] =
Header.createRendered(
ci"Accept-Language",
_.values,
parse,
)
implicit val headerSemigroupInstance: cats.Semigroup[`Accept-Language`] =
(a, b) => `Accept-Language`(a.values.concatNel(b.values))
}
/** Request header used to indicate which natural language would be preferred for the response
* to be translated into.
*
* [[https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.5 RFC-7231 Section 5.3.5]]
*/
final case class `Accept-Language`(values: NonEmptyList[LanguageTag]) {
def qValue(languageTag: LanguageTag): QValue =
values.toList
.collect {
case tag: LanguageTag if tag.matches(languageTag) =>
if (tag.primaryTag == "*") (0, tag.q)
else (1 + tag.subTags.size, tag.q)
}
.sortBy(-_._1)
.headOption
.fold(QValue.Zero)(_._2)
def satisfiedBy(languageTag: LanguageTag): Boolean = qValue(languageTag) > QValue.Zero
}