From 73b267b3e8e284be400f2933b9ceb25b230d8afe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Julian=20B=C3=A4ume?= <julian.baeume@open-xchange.com>
Date: Fri, 21 Mar 2014 10:14:00 +0100
Subject: [PATCH] add support for multiline string in headers

Some languages (such as Polish, Russian or Romanian) do have more
complicated plural forms. Those are still expressible by a more
complicated mathematical expression. However, the msgmerge tool of
gettext will in these cases write multiline header fields. When parsing
such files with this lib, the headers get screwed up, so this patch
provides an example (from a pl_PL po file) and fixes this by joining the
lines in the header, before doing the actual parsing.
---
 lib/po.js                   | 13 ++++++++++++-
 test/fixtures/multi-line.po |  5 ++++-
 test/parse.js               |  8 ++++++++
 3 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/lib/po.js b/lib/po.js
index 08b4786..3d175e4 100644
--- a/lib/po.js
+++ b/lib/po.js
@@ -74,7 +74,18 @@ PO.parse = function (data) {
         'Plural-Forms': '',
     };
 
-    headers.split(/\n/).forEach(function (header) {
+    headers.split(/\n/).reduce(function (acc, line) {
+        if (acc.merge) {
+            //join lines, remove last resp. first "
+            line = acc.pop().slice(0, -1) + line.slice(1);
+            delete acc.merge;
+        }
+        if (/^".*"$/.test(line) && !/^".*\\n"$/.test(line)) {
+            acc.merge = true;
+        }
+        acc.push(line);
+        return acc;
+    }, []).forEach(function (header) {
         if (header.match(/^#/)) {
             po.comments.push(header.replace(/^#\s*/, ''));
         }
diff --git a/test/fixtures/multi-line.po b/test/fixtures/multi-line.po
index 8cc9046..5b49f5c 100644
--- a/test/fixtures/multi-line.po
+++ b/test/fixtures/multi-line.po
@@ -1,6 +1,8 @@
 # French translation of Link (6.x-2.9)
 # Copyright (c) 2011 by the French translation team
 #
+## Plural-Forms by polish translation team to demonstrate multi-line ##
+#
 msgid ""
 msgstr ""
 "Project-Id-Version: Link (6.x-2.9)\n"
@@ -10,7 +12,8 @@ msgstr ""
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"Plural-Forms: nplurals=2; plural=(n > 1);\n"
+"Plural-Forms: nplurals=3; plural=n==1 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 "
+"|| n%100>=20) ? 1 : 2;\n"
 "Last-Translator: Ruben Vermeersch <ruben@rocketeer.be>\n"
 "Language: fr\n"
 "X-Generator: Poedit 1.6.2\n"
diff --git a/test/parse.js b/test/parse.js
index fbe1ef2..99e0f44 100644
--- a/test/parse.js
+++ b/test/parse.js
@@ -23,6 +23,14 @@ describe('Parse', function () {
         assert.equal(item.msgstr, "Les ébauches de jetons suivantes peuvent être utilisées à la fois dans les chemins et dans les titres. Lorsqu'elles sont utilisées dans un chemin ou un titre, elles seront remplacées par les valeurs appropriées.");
     });
 
+    it('Handles multi-line headers', function () {
+        var po = PO.parse(fs.readFileSync(__dirname + '/fixtures/multi-line.po', 'utf8'));
+        assert.notEqual(po, null);
+        assert.equal(po.items.length, 1);
+
+        assert.equal(po.headers['Plural-Forms'], 'nplurals=3; plural=n==1 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2;');
+    });
+
     it('Handles translator comments', function () {
         var po = PO.parse(fs.readFileSync(__dirname + '/fixtures/comment.po', 'utf8'));
         assert.notEqual(po, null);