Scaposer is a GNU gettext po file parser written in Scala. It's strange that there's not many JVM libraries of this kind, see the discussion on Stackoverflow.

To extract i18n strings from Scala source code files, use Scala xgettext.

Discussion group: https://groups.google.com/group/scala-xgettext

Basic usage

See Scaladoc.

val string = """
msgid "Hello"
msgstr "Bonjour"
"""

val poo = scaposer.Parser.parsePo(string)  // => An Option[scaposer.Po] (None on failure)

Use t methods to get the translations:

val po = poo.get // => A scaposer.Po
po.t("Hello")    // => "Bonjour"

If there's no translation, or the translation is an empty string (not translated yet), the input is returned:

po.t("Hi")  // => "Hi"

To take out the map of all translations (to save into DB etc.), call po.body.

Context

val string = """
msgid "Hello"
msgstr "Bonjour"

msgctxt "Casual"
msgid "Hello"
msgstr "Salut"
"""

val po = Parser.parsePo(string).get
po.t("Casual", "Hello")  // => "Salut"

If there's no translation for the context, the translation without context is tried:

po.t("Missing context", "Hello")  // => "Bonjour"

Plural-Forms

Your po file must define Plural-Forms exactly as at:

• http://www.gnu.org/software/gettext/manual/html_node/Plural-forms.html#Plural-forms
• http://www.gnu.org/software/gettext/manual/html_node/Translating-plural-forms.html#Translating-plural-forms

Scaposer does not evaluate the plural expression, which is in C language. It just removes spaces in the expression and performs string comparison. See evaluatePluralForms.

val string = """
msgid ""
msgstr "Plural-Forms: nplurals=2; plural=n>1;"

msgid "I have one apple"
msgid_plural "I have %d apples"
msgstr[0] "J'ai une pomme"
msgstr[1] "J'ai %d pommes"
"""

val po = Parser.parsePo(string).get
po.t("I have one apple", "I have %d apples", 1)
po.t("I have one apple", "I have %d apples", 2)
po.t("A context", "I have one apple", "I have %d apples", 3)

Merge Po objects

You can merge Po together.

val po4 = po1 ++ po2 ++ po3

Just like when you merge maps, translations in po3 will overwrite those in po2 will overwrite those in po1.

Use with SBT

Supported Scala versions: 2.11.x, 2.10.x

build.sbt example:

libraryDependencies += "tv.cntt" %% "scaposer" % "1.5"

Scaposer is used in Xitrum.