1 files changed, 33 insertions, 0 deletions
diff --git a/tagging/validators.py b/tagging/validators.py
new file mode 100644
index 0000000..363fa6d
--- /dev/null
+++ b/tagging/validators.py
@@ -0,0 +1,33 @@
+import re
+
+from django.core.validators import ValidationError
+from django.utils.encoding import smart_unicode
+
+from tagging.utils import get_tag_name_list
+
+tag_re = re.compile(r'^[-\w]+$', re.U)
+tag_list_re = re.compile(r'^[-\w]+(?:(?:,\s|[,\s])[-\w]+)*$', re.U)
+
+def isTagList(field_data, all_data):
+    """
+    Validates that ``field_data`` is a valid list of tag names,
+    separated by a single comma, a single space or a comma followed
+    by a space.
+    """
+    if field_data is not None:
+        field_data = smart_unicode(field_data)
+    if not tag_list_re.search(field_data):
+        raise ValidationError(u'Tag names must contain only unicode alphanumeric characters, numbers, underscores or hyphens, with a comma, space or comma followed by space used to separate each tag name.')
+    tag_names = get_tag_name_list(field_data)
+    for tag_name in tag_names:
+        if len(tag_name) > 50:
+            raise ValidationError(u'Tag names must be no longer than 50 characters.')
+
+def isTag(field_data, all_data):
+    """
+    Validates that ``field_data`` is a valid tag name.
+    """
+    if field_data is not None:
+        field_data = smart_unicode(field_data)
+    if not tag_re.match(field_data):
+        raise ValidationError(u'Tag names must contain only unicode alphanumeric characters, numbers, underscores or hyphens.')