是否有用于解析gettext PO文件的Java库？

Question

有谁知道一个Java库,它会让我解析.PO文件？我只想创建一个ID和值的Map,这样我就可以将它们加载到数据库中.

Answer 1

我搜索了互联网,也找不到现有的图书馆.如果你使用Scala,由于它的解析器组合器功能,你自己编写解析器非常容易.

打电话PoParser.parsePo("po file content").结果是一个列表Translation.

我已将此代码放入库中(当然可以由任何JVM语言使用,包括Java!):https: //github.com/ngocdaothanh/scaposer

import scala.util.parsing.combinator.JavaTokenParsers

trait Translation

case class SingularTranslation(
  msgctxto: Option[String],
  msgid:    String,
  msgstr:   String) extends Translation

case class PluralTranslation(
  msgctxto:    Option[String],
  msgid:       String,
  msgidPlural: String,
  msgstrNs:    Map[Int, String]) extends Translation

// http://www.gnu.org/software/hello/manual/gettext/PO-Files.html
object PoParser extends JavaTokenParsers {
  // Removes the first and last quote (") character of strings
  // and concats them.
  private def unquoted(quoteds: List[String]): String =
    quoteds.foldLeft("") { (acc, quoted) =>
      acc + quoted.substring(1, quoted.length - 1)
    }

  // Scala regex is single line by default
  private def comment = rep(regex("^#.*".r))

  private def msgctxt = "msgctxt" ~ rep(stringLiteral) ^^ {
    case _ ~ quoteds => unquoted(quoteds)
  }

  private def msgid = "msgid" ~ rep(stringLiteral) ^^ {
    case _ ~ quoteds => unquoted(quoteds)
  }

  private def msgidPlural = "msgid_plural" ~ rep(stringLiteral) ^^ {
    case _ ~ quoteds => unquoted(quoteds)
  }

  private def msgstr = "msgstr" ~ rep(stringLiteral) ^^ {
    case _ ~ quoteds => unquoted(quoteds)
  }

  private def msgstrN = "msgstr[" ~ wholeNumber ~ "]" ~ rep(stringLiteral) ^^ {
    case _ ~ number ~ _ ~ quoteds => (number.toInt, unquoted(quoteds))
  }

  private def singular =
    (opt(comment) ~ opt(msgctxt) ~
     opt(comment) ~ msgid ~
     opt(comment) ~ msgstr ~ opt(comment)) ^^ {
    case _ ~ ctxto ~ _ ~ id ~ _ ~ s ~ _ =>
      SingularTranslation(ctxto, id, s)
  }

  private def plural =
    (opt(comment) ~ opt(msgctxt) ~
     opt(comment) ~ msgid ~
     opt(comment) ~ msgidPlural ~
     opt(comment) ~ rep(msgstrN) ~ opt(comment)) ^^ {
    case _ ~ ctxto ~ _ ~ id ~ _ ~ idp ~ _ ~ tuple2s ~ _ =>
      PluralTranslation(ctxto, id, idp, tuple2s.toMap)
  }

  private def exp = rep(singular | plural)

  def parsePo(po: String): List[Translation] = {
    val parseRet = parseAll(exp, po)
    if (parseRet.successful) parseRet.get else Nil
  }
}

Answer 2

根据Java gettext实用程序手册,您可以使用msgfmt --java2程序将PO文件转换为ResourceBundle类,并使用java.util.ResourceBundle或gnu.gettext.GettextResource读取它 - 我认为这是一种最有效的方法.Gettext-commons完全相同,包括调用msgfmt的中间进程创建,因为它的位置如下:

Gettext Commons是使用 GNU gettext实用程序的 Java库.

如果您仍然想要一个完整的Java库,那么我看到的唯一方法就是编写自己的库来解析这种格式,即将msgfmt源代码从C语言重写为Java语言.但我不确定它会比创建进程+运行C程序更快.

Answer 3

gettext-commons是我在进行一些研究时发现的唯一方法。