added infrastructure code for later javascript translating (currently not active)

git-svn-id: http://code.djangoproject.com/svn/django/trunk@1529 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/views/i18n.py

@@ -1,5 +1,12 @@
+import re
+import os
+
+import gettext as gettext_module
+
 from django.utils import httpwrappers
-from django.utils.translation import check_for_language
+from django.utils.translation import check_for_language, activate, to_locale, get_language
+from django.utils.text import javascript_quote
+from django.conf import settings
 
 def set_language(request):
     """
@@ -20,3 +27,163 @@ def set_language(request):
         else:
             response.set_cookie('django_language', lang_code)
     return response
+
+NullSource = """
+/* gettext identity library */
+
+function gettext(msgid) {
+    return msgid;
+}
+
+function ngettext(singular, plural, count) {
+    if (count == 1) {
+        return singular;
+    } else {
+        return plural;
+    }
+}
+
+function gettext_noop(msgid) {
+    return msgid;
+}
+"""
+
+LibHead = """
+/* gettext library */
+
+var catalog = new Array();
+"""
+
+LibFoot = """
+
+function gettext(msgid) {
+    var value = catalog[msgid];
+    if (typeof(value) == 'undefined') {
+        return msgid;
+    } else {
+        if (typeof(value) == 'string') {
+            return value;
+        } else {
+            return value[0];
+        }
+    }
+}
+
+function ngettext(singular, plural, count) {
+    value = catalog[singular];
+    if (typeof(value) == 'undefined') {
+        if (count == 1) {
+            return singular;
+        } else {
+            return plural;
+        }
+    } else {
+        return value[pluralidx(count)];
+    }
+}
+
+function gettext_noop(msgid) {
+    return msgid;
+}
+"""
+
+SimplePlural = """
+function pluralidx(count) {
+    if (count == 1) {
+        return 0;
+    } else {
+        return 1;
+    }
+}
+"""
+
+InterPolate = r"""
+function interpolate(fmt, obj, named) {
+    if (named) {
+        return fmt.replace(/%\(\w+\)s/, function(match){return String(obj[match.slice(2,-2)])});
+    } else {
+        return fmt.replace(/%s/, function(match){return String(obj.shift())});
+    }
+}
+"""
+
+def javascript_catalog(request, domain='djangojs', packages=None):
+    """
+    Returns the selected language catalog as a javascript library.
+
+    Receives the list of packages to check for translations in the
+    packages parameter either from an infodict or as a +-delimited
+    string from the request. Default is 'django.conf'.
+
+    Additionally you can override the gettext domain for this view,
+    but usually you don't want to do that, as JavaScript messages
+    go to the djangojs domain. But this might be needed if you
+    deliver your JavaScript source from Django templates.
+    """
+    if request.GET:
+        if request.GET.has_key('language'):
+            if check_for_language(request.GET['language']):
+                activate(request.GET['language'])
+    if packages is None:
+        packages = ['django.conf']
+    if type(packages) in (str, unicode):
+        packages = packages.split('+')
+    default_locale = to_locale(settings.LANGUAGE_CODE)
+    locale = to_locale(get_language())
+    t = {}
+    paths = []
+    for package in packages:
+        p = __import__(package, {}, {}, [''])
+        path = os.path.join(os.path.dirname(p.__file__), 'locale')
+        paths.append(path)
+        #!!! add loading of catalogs from settings.LANGUAGE_CODE and request.LANGUAGE_CODE!
+        try:
+            catalog = gettext_module.translation(domain, path, [default_locale])
+        except IOError, e:
+            catalog = None
+        if catalog is not None:
+            t.update(catalog._catalog)
+    if locale != default_locale:
+        for path in paths:
+            try:
+                catalog = gettext_module.translation(domain, path, [locale])
+            except IOError, e:
+                catalog = None
+            if catalog is not None:
+                t.update(catalog._catalog)
+    src = [LibHead]
+    plural = None
+    for l in t[''].split('\n'):
+        if l.startswith('Plural-Forms:'):
+            plural = l.split(':',1)[1].strip()
+    if plural is not None:
+        # this should actually be a compiled function of a typical plural-form:
+        # Plural-Forms: nplurals=3; plural=n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2;
+        plural = [el.strip() for el in plural.split(';') if el.strip().startswith('plural=')][0].split('=',1)[1]
+        src.append('function pluralidx(n) {\n    return %s;\n}\n' % plural)
+    else:
+        src.append(SimplePlural)
+    csrc = []
+    pdict = {}
+    for k, v in t.items():
+        if k == '':
+            continue
+        if type(k) in (str, unicode):
+            csrc.append("catalog['%s'] = '%s';\n" % (javascript_quote(k), javascript_quote(v)))
+        elif type(k) == tuple:
+            if not pdict.has_key(k[0]):
+                pdict[k[0]] = k[1]
+            else:
+                pdict[k[0]] = max(k[1], pdict[k[0]])
+            csrc.append("catalog['%s'][%d] = '%s';\n" % (javascript_quote(k[0]), k[1], javascript_quote(v)))
+        else:
+            raise TypeError, k
+    csrc.sort()
+    for k,v in pdict.items():
+        src.append("catalog['%s'] = [%s];\n" % (javascript_quote(k), ','.join(["''"]*(v+1))))
+    src.extend(csrc)
+    src.append(LibFoot)
+    src.append(InterPolate)
+    src = ''.join(src)
+    return httpwrappers.HttpResponse(src, 'text/javascript')
+