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/*
Rapture, version 2.0.0. Copyright 2010-2016 Jon Pretty, Propensive Ltd.
The primary distribution site is
http://rapture.io/
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 rapture.i18n.googleTranslate
import rapture.base._
import rapture.i18n._
import scala.reflect._
import language.implicitConversions
import language.experimental.macros
object NotString {
implicit def ambiguous1: NotString[String] = null
implicit def ambiguous2: NotString[String] = null
implicit def unambiguous[S <: String]: NotString[S] = null
}
class NotString[S <: String]
class GoogleApiKey[S <: String](key: S)(implicit notString: NotString[S])
object GoogleApiKey {
def apply[S <: String](key: S)(implicit notString: NotString[key.type]): GoogleApiKey[key.type] =
new GoogleApiKey[key.type](key)(notString)
}
object `package` {
implicit def upcast[ToLang <: Language, FromLang <: Language, S <: String](from: I18n[String, FromLang])(implicit license: GoogleApiKey[S]): I18n[String, ToLang] =
macro Macros.missingTranslationsMacro[ToLang, FromLang, S]
}
object Macros {
def missingTranslationsMacro[ToLang <: Language: c.WeakTypeTag, FromLang <: Language: c.WeakTypeTag, S <: String: c.WeakTypeTag](c:
BlackboxContext)(from: c.Expr[I18n[String, FromLang]])(license: c.Expr[GoogleApiKey[S]]): c.Expr[I18n[String, ToLang]] = {
import c.universe._
import compatibility._
// FIXME: Extract this correctly!
val key = weakTypeOf[S].toString.split("\"")(1)
val fromLangs = (normalize(c)(weakTypeOf[FromLang]) match {
case rt: RefinedType => rt.parents
case typ: Type => List(typ)
}).map(_.toString.split("\\.").last.toLowerCase).to[Set]
val toLangs = (normalize(c)(weakTypeOf[ToLang]) match {
case rt: RefinedType => rt.parents
case typ: Type => List(typ)
}).map(_.toString.split("\\.").last.toLowerCase).to[Set]
val missing = toLangs -- fromLangs
def langs(tree: Tree): Map[String, String] = tree match {
case Apply(Select(Apply(Select(Select(Select(id1, id2), id3), id4), List(Apply(_, List(Literal(Constant(
str: String)))))), lang), _) if id1.toString == "rapture" && id2.toString == "i18n" &&
id3.toString == "package" && id4.toString == "I18nEnrichedStringContext" =>
Map(lang.toString -> str)
case Apply(app: Apply, _) =>
langs(app)
case Apply(TypeApply(Select(q, id6), _), List(app)) if id6.toString == "$bar" =>
langs(q) ++ langs(app)
}
val ls = langs(from.tree)
val extras = ls.find(_._1 == "en").orElse(ls.find(_._1 == "fr")).getOrElse(ls.head) match {
case (lang, text) =>
missing.map { to =>
val tran = GoogleTranslate.translate(key, text, lang.toUpperCase, to.toUpperCase).replaceAll("\"", "\\\\\"")
s"""${to.toLowerCase}"${tran}""""
}
}
c.abort(c.enclosingPosition, s"""Not all required language translations have been provided. Consider appending the following translations to the expression:\n\n ${extras.mkString("& ", " & ", "")}\n""")
}
}
object GoogleTranslate {
import rapture.uri._
import rapture.net._
import rapture.io._
import rapture.codec._, encodings.`UTF-8`._
import rapture.json._, jsonBackends.jawn._
def translate(key: String, text: String, from: String, to: String): String = {
val out = uri"https://www.googleapis.com/language/translate/v2?q=$text&target=$to&format=text&source=$from&key=$key".slurp[Char]
Json.parse(out).data.translations(0).translatedText.as[String]
}
}
