Initial import

ebook_converter/ebooks/metadata/book/formatter.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python2
+# vim:fileencoding=utf-8
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+__license__ = 'GPL v3'
+__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
+
+from calibre.ebooks.metadata.book import TOP_LEVEL_IDENTIFIERS, ALL_METADATA_FIELDS
+
+from calibre.utils.formatter import TemplateFormatter
+
+
+class SafeFormat(TemplateFormatter):
+
+    def __init__(self):
+        TemplateFormatter.__init__(self)
+
+    def get_value(self, orig_key, args, kwargs):
+        if not orig_key:
+            return ''
+        key = orig_key = orig_key.lower()
+        if (key != 'title_sort' and key not in TOP_LEVEL_IDENTIFIERS and
+                key not in ALL_METADATA_FIELDS):
+            from calibre.ebooks.metadata.book.base import field_metadata
+            key = field_metadata.search_term_to_field_key(key)
+            if key is None or (self.book and
+                                key not in self.book.all_field_keys()):
+                if hasattr(self.book, orig_key):
+                    key = orig_key
+                else:
+                    raise ValueError(_('Value: unknown field ') + orig_key)
+        try:
+            b = self.book.get_user_metadata(key, False)
+        except:
+            b = None
+        if b and b['datatype'] in {'int', 'float'} and self.book.get(key, None) is None:
+            v = ''
+        else:
+            v = self.book.format_field(key, series_with_index=False)[1]
+        if v is None:
+            return ''
+        if v == '':
+            return ''
+        return v
+
+