Исходный код calibre.ebooks.metadata.book.base

#!/usr/bin/env python
# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai


__license__   = 'GPL v3'
__copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
__docformat__ = 'restructuredtext en'

import copy, traceback

from calibre import prints
from calibre.constants import DEBUG
from calibre.ebooks.metadata.book import (SC_COPYABLE_FIELDS,
        SC_FIELDS_COPY_NOT_NULL, STANDARD_METADATA_FIELDS,
        TOP_LEVEL_IDENTIFIERS, ALL_METADATA_FIELDS)
from calibre.library.field_metadata import FieldMetadata
from calibre.utils.icu import sort_key
from polyglot.builtins import iteritems, string_or_bytes

# Special sets used to optimize the performance of getting and setting
# attributes on Metadata objects
SIMPLE_GET = frozenset(STANDARD_METADATA_FIELDS - TOP_LEVEL_IDENTIFIERS)
SIMPLE_SET = frozenset(SIMPLE_GET - {'identifiers'})


def human_readable(size, precision=2):
    """ Convert a size in bytes into megabytes """
    ans = size/(1024*1024)
    if ans < 0.1:
        return '<0.1MB'
    return ('%.'+str(precision)+'f'+ 'MB') % ans


NULL_VALUES = {
                'user_metadata': {},
                'cover_data'   : (None, None),
                'tags'         : [],
                'identifiers'  : {},
                'languages'    : [],
                'device_collections': [],
                'author_sort_map': {},
                'authors'      : [_('Unknown')],
                'author_sort'  : _('Unknown'),
                'title'        : _('Unknown'),
                'user_categories' : {},
                'author_link_map' : {},
                'language'     : 'und'
}

field_metadata = FieldMetadata()


def reset_field_metadata():
    global field_metadata
    field_metadata = FieldMetadata()


ck = lambda typ: icu_lower(typ).strip().replace(':', '').replace(',', '')
cv = lambda val: val.strip().replace(',', '|')


[документация]class Metadata: ''' A class representing all the metadata for a book. The various standard metadata fields are available as attributes of this object. You can also stick arbitrary attributes onto this object. Metadata from custom columns should be accessed via the get() method, passing in the lookup name for the column, for example: "#mytags". Use the :meth:`is_null` method to test if a field is null. This object also has functions to format fields into strings. The list of standard metadata fields grows with time is in :data:`STANDARD_METADATA_FIELDS`. Please keep the method based API of this class to a minimum. Every method becomes a reserved field name. ''' __calibre_serializable__ = True def __init__(self, title, authors=(_('Unknown'),), other=None, template_cache=None, formatter=None): ''' @param title: title or ``_('Unknown')`` @param authors: List of strings or [] @param other: None or a metadata object ''' _data = copy.deepcopy(NULL_VALUES) _data.pop('language') object.__setattr__(self, '_data', _data) if other is not None: self.smart_update(other) else: if title: self.title = title if authors: # List of strings or [] self.author = list(authors) if authors else [] # Needed for backward compatibility self.authors = list(authors) if authors else [] from calibre.ebooks.metadata.book.formatter import SafeFormat self.formatter = SafeFormat() if formatter is None else formatter self.template_cache = template_cache
[документация] def is_null(self, field): ''' Return True if the value of field is null in this object. 'null' means it is unknown or evaluates to False. So a title of _('Unknown') is null or a language of 'und' is null. Be careful with numeric fields since this will return True for zero as well as None. Also returns True if the field does not exist. ''' try: null_val = NULL_VALUES.get(field, None) val = getattr(self, field, None) return not val or val == null_val except: return True
def set_null(self, field): null_val = copy.copy(NULL_VALUES.get(field)) setattr(self, field, null_val) def __getattribute__(self, field): _data = object.__getattribute__(self, '_data') if field in SIMPLE_GET: return _data.get(field, None) if field in TOP_LEVEL_IDENTIFIERS: return _data.get('identifiers').get(field, None) if field == 'language': try: return _data.get('languages', [])[0] except: return NULL_VALUES['language'] try: return object.__getattribute__(self, field) except AttributeError: pass if field in _data['user_metadata']: d = _data['user_metadata'][field] val = d['#value#'] if d['datatype'] != 'composite': return val if val is None: d['#value#'] = 'RECURSIVE_COMPOSITE FIELD (Metadata) ' + field val = d['#value#'] = self.formatter.safe_format( d['display']['composite_template'], self, _('TEMPLATE ERROR'), self, column_name=field, template_cache=self.template_cache).strip() return val if field.startswith('#') and field.endswith('_index'): try: return self.get_extra(field[:-6]) except: pass raise AttributeError( 'Metadata object has no attribute named: '+ repr(field)) def __setattr__(self, field, val, extra=None): _data = object.__getattribute__(self, '_data') if field in SIMPLE_SET: if val is None: val = copy.copy(NULL_VALUES.get(field, None)) _data[field] = val elif field in TOP_LEVEL_IDENTIFIERS: field, val = self._clean_identifier(field, val) identifiers = _data['identifiers'] identifiers.pop(field, None) if val: identifiers[field] = val elif field == 'identifiers': if not val: val = copy.copy(NULL_VALUES.get('identifiers', None)) self.set_identifiers(val) elif field == 'language': langs = [] if val and val.lower() != 'und': langs = [val] _data['languages'] = langs elif field in _data['user_metadata']: _data['user_metadata'][field]['#value#'] = val _data['user_metadata'][field]['#extra#'] = extra else: # You are allowed to stick arbitrary attributes onto this object as # long as they don't conflict with global or user metadata names # Don't abuse this privilege self.__dict__[field] = val def __iter__(self): return iter(object.__getattribute__(self, '_data')) def has_key(self, key): return key in object.__getattribute__(self, '_data')
[документация] def deepcopy(self, class_generator=lambda : Metadata(None)): ''' Do not use this method unless you know what you are doing, if you want to create a simple clone of this object, use :meth:`deepcopy_metadata` instead. Class_generator must be a function that returns an instance of Metadata or a subclass of it.''' m = class_generator() if not isinstance(m, Metadata): return None object.__setattr__(m, '__dict__', copy.deepcopy(self.__dict__)) return m
def deepcopy_metadata(self): m = Metadata(None) object.__setattr__(m, '_data', copy.deepcopy(object.__getattribute__(self, '_data'))) return m def get(self, field, default=None): try: return self.__getattribute__(field) except AttributeError: return default def get_extra(self, field, default=None): _data = object.__getattribute__(self, '_data') if field in _data['user_metadata']: try: return _data['user_metadata'][field]['#extra#'] except: return default raise AttributeError( 'Metadata object has no attribute named: '+ repr(field)) def set(self, field, val, extra=None): self.__setattr__(field, val, extra)
[документация] def get_identifiers(self): ''' Return a copy of the identifiers dictionary. The dict is small, and the penalty for using a reference where a copy is needed is large. Also, we don't want any manipulations of the returned dict to show up in the book. ''' ans = object.__getattribute__(self, '_data')['identifiers'] if not ans: ans = {} return copy.deepcopy(ans)
def _clean_identifier(self, typ, val): if typ: typ = ck(typ) if val: val = cv(val) return typ, val
[документация] def set_identifiers(self, identifiers): ''' Set all identifiers. Note that if you previously set ISBN, calling this method will delete it. ''' cleaned = {ck(k):cv(v) for k, v in iteritems(identifiers) if k and v} object.__getattribute__(self, '_data')['identifiers'] = cleaned
[документация] def set_identifier(self, typ, val): 'If val is empty, deletes identifier of type typ' typ, val = self._clean_identifier(typ, val) if not typ: return identifiers = object.__getattribute__(self, '_data')['identifiers'] identifiers.pop(typ, None) if val: identifiers[typ] = val
def has_identifier(self, typ): identifiers = object.__getattribute__(self, '_data')['identifiers'] return typ in identifiers # field-oriented interface. Intended to be the same as in LibraryDatabase
[документация] def standard_field_keys(self): ''' return a list of all possible keys, even if this book doesn't have them ''' return STANDARD_METADATA_FIELDS
[документация] def custom_field_keys(self): ''' return a list of the custom fields in this book ''' return iter(object.__getattribute__(self, '_data')['user_metadata'])
[документация] def all_field_keys(self): ''' All field keys known by this instance, even if their value is None ''' _data = object.__getattribute__(self, '_data') return frozenset(ALL_METADATA_FIELDS.union(frozenset(_data['user_metadata'])))
[документация] def metadata_for_field(self, key): ''' return metadata describing a standard or custom field. ''' if key not in self.custom_field_keys(): return self.get_standard_metadata(key, make_copy=False) return self.get_user_metadata(key, make_copy=False)
[документация] def all_non_none_fields(self): ''' Return a dictionary containing all non-None metadata fields, including the custom ones. ''' result = {} _data = object.__getattribute__(self, '_data') for attr in STANDARD_METADATA_FIELDS: v = _data.get(attr, None) if v is not None: result[attr] = v # separate these because it uses the self.get(), not _data.get() for attr in TOP_LEVEL_IDENTIFIERS: v = self.get(attr, None) if v is not None: result[attr] = v for attr in _data['user_metadata']: v = self.get(attr, None) if v is not None: result[attr] = v if _data['user_metadata'][attr]['datatype'] == 'series': result[attr+'_index'] = _data['user_metadata'][attr]['#extra#'] return result
# End of field-oriented interface # Extended interfaces. These permit one to get copies of metadata dictionaries, and to # get and set custom field metadata
[документация] def get_standard_metadata(self, field, make_copy): ''' return field metadata from the field if it is there. Otherwise return None. field is the key name, not the label. Return a copy if requested, just in case the user wants to change values in the dict. ''' if field in field_metadata and field_metadata[field]['kind'] == 'field': if make_copy: return copy.deepcopy(field_metadata[field]) return field_metadata[field] return None
[документация] def get_all_standard_metadata(self, make_copy): ''' return a dict containing all the standard field metadata associated with the book. ''' if not make_copy: return field_metadata res = {} for k in field_metadata: if field_metadata[k]['kind'] == 'field': res[k] = copy.deepcopy(field_metadata[k]) return res
[документация] def get_all_user_metadata(self, make_copy): ''' return a dict containing all the custom field metadata associated with the book. ''' _data = object.__getattribute__(self, '_data') user_metadata = _data['user_metadata'] if not make_copy: return user_metadata res = {} for k in user_metadata: res[k] = copy.deepcopy(user_metadata[k]) return res
[документация] def get_user_metadata(self, field, make_copy): ''' return field metadata from the object if it is there. Otherwise return None. field is the key name, not the label. Return a copy if requested, just in case the user wants to change values in the dict. ''' _data = object.__getattribute__(self, '_data') _data = _data['user_metadata'] if field in _data: if make_copy: return copy.deepcopy(_data[field]) return _data[field] return None
[документация] def set_all_user_metadata(self, metadata): ''' store custom field metadata into the object. Field is the key name not the label ''' if metadata is None: traceback.print_stack() return um = {} for key, meta in iteritems(metadata): m = meta.copy() if '#value#' not in m: if m['datatype'] == 'text' and m['is_multiple']: m['#value#'] = [] else: m['#value#'] = None um[key] = m _data = object.__getattribute__(self, '_data') _data['user_metadata'] = um
[документация] def set_user_metadata(self, field, metadata): ''' store custom field metadata for one column into the object. Field is the key name not the label ''' if field is not None: if not field.startswith('#'): raise AttributeError( 'Custom field name %s must begin with \'#\''%repr(field)) if metadata is None: traceback.print_stack() return m = dict(metadata) # Copying the elements should not be necessary. The objects referenced # in the dict should not change. Of course, they can be replaced. # for k,v in iteritems(metadata): # m[k] = copy.copy(v) if '#value#' not in m: if m['datatype'] == 'text' and m['is_multiple']: m['#value#'] = [] else: m['#value#'] = None _data = object.__getattribute__(self, '_data') _data['user_metadata'][field] = m
[документация] def remove_stale_user_metadata(self, other_mi): ''' Remove user metadata keys (custom column keys) if they don't exist in 'other_mi', which must be a metadata object ''' me = self.get_all_user_metadata(make_copy=False) other = set(other_mi.custom_field_keys()) new = {} for k,v in me.items(): if k in other: new[k] = v self.set_all_user_metadata(new)
[документация] def template_to_attribute(self, other, ops): ''' Takes a list [(src,dest), (src,dest)], evaluates the template in the context of other, then copies the result to self[dest]. This is on a best-efforts basis. Some assignments can make no sense. ''' if not ops: return from calibre.ebooks.metadata.book.formatter import SafeFormat formatter = SafeFormat() for op in ops: try: src = op[0] dest = op[1] val = formatter.safe_format(src, other, 'PLUGBOARD TEMPLATE ERROR', other) if dest == 'tags': self.set(dest, [f.strip() for f in val.split(',') if f.strip()]) elif dest == 'authors': self.set(dest, [f.strip() for f in val.split('&') if f.strip()]) else: self.set(dest, val) except: if DEBUG: traceback.print_exc()
# Old Metadata API {{{ def print_all_attributes(self): for x in STANDARD_METADATA_FIELDS: prints('%s:'%x, getattr(self, x, 'None')) for x in self.custom_field_keys(): meta = self.get_user_metadata(x, make_copy=False) if meta is not None: prints(x, meta) prints('--------------')
[документация] def smart_update(self, other, replace_metadata=False): ''' Merge the information in `other` into self. In case of conflicts, the information in `other` takes precedence, unless the information in `other` is NULL. ''' def copy_not_none(dest, src, attr): v = getattr(src, attr, None) if v not in (None, NULL_VALUES.get(attr, None)): setattr(dest, attr, copy.deepcopy(v)) unknown = _('Unknown') if other.title and other.title != unknown: self.title = other.title if hasattr(other, 'title_sort'): self.title_sort = other.title_sort if other.authors and ( other.authors[0] != unknown or ( not self.authors or ( len(self.authors) == 1 and self.authors[0] == unknown and getattr(self, 'author_sort', None) == unknown ) ) ): self.authors = list(other.authors) if hasattr(other, 'author_sort_map'): self.author_sort_map = dict(other.author_sort_map) if hasattr(other, 'author_sort'): self.author_sort = other.author_sort if replace_metadata: # SPECIAL_FIELDS = frozenset(['lpath', 'size', 'comments', 'thumbnail']) for attr in SC_COPYABLE_FIELDS: setattr(self, attr, getattr(other, attr, 1.0 if attr == 'series_index' else None)) self.tags = other.tags self.cover_data = getattr(other, 'cover_data', NULL_VALUES['cover_data']) self.set_all_user_metadata(other.get_all_user_metadata(make_copy=True)) for x in SC_FIELDS_COPY_NOT_NULL: copy_not_none(self, other, x) if callable(getattr(other, 'get_identifiers', None)): self.set_identifiers(other.get_identifiers()) # language is handled below else: for attr in SC_COPYABLE_FIELDS: copy_not_none(self, other, attr) for x in SC_FIELDS_COPY_NOT_NULL: copy_not_none(self, other, x) if other.tags: # Case-insensitive but case preserving merging lotags = [t.lower() for t in other.tags] lstags = [t.lower() for t in self.tags] ot, st = map(frozenset, (lotags, lstags)) for t in st.intersection(ot): sidx = lstags.index(t) oidx = lotags.index(t) self.tags[sidx] = other.tags[oidx] self.tags += [t for t in other.tags if t.lower() in ot-st] if getattr(other, 'cover_data', False): other_cover = other.cover_data[-1] self_cover = self.cover_data[-1] if self.cover_data else b'' if not self_cover: self_cover = b'' if not other_cover: other_cover = b'' if len(other_cover) > len(self_cover): self.cover_data = other.cover_data if callable(getattr(other, 'custom_field_keys', None)): for x in other.custom_field_keys(): meta = other.get_user_metadata(x, make_copy=True) if meta is not None: self_tags = self.get(x, []) if isinstance(self_tags, string_or_bytes): self_tags = [] self.set_user_metadata(x, meta) # get... did the deepcopy other_tags = other.get(x, []) if meta['datatype'] == 'text' and meta['is_multiple']: # Case-insensitive but case preserving merging lotags = [t.lower() for t in other_tags] try: lstags = [t.lower() for t in self_tags] except TypeError: # Happens if x is not a text, is_multiple field # on self lstags = [] self_tags = [] ot, st = map(frozenset, (lotags, lstags)) for t in st.intersection(ot): sidx = lstags.index(t) oidx = lotags.index(t) self_tags[sidx] = other_tags[oidx] self_tags += [t for t in other_tags if t.lower() in ot-st] setattr(self, x, self_tags) my_comments = getattr(self, 'comments', '') other_comments = getattr(other, 'comments', '') if not my_comments: my_comments = '' if not other_comments: other_comments = '' if len(other_comments.strip()) > len(my_comments.strip()): self.comments = other_comments # Copy all the non-none identifiers if callable(getattr(other, 'get_identifiers', None)): d = self.get_identifiers() s = other.get_identifiers() d.update([v for v in iteritems(s) if v[1] is not None]) self.set_identifiers(d) else: # other structure not Metadata. Copy the top-level identifiers for attr in TOP_LEVEL_IDENTIFIERS: copy_not_none(self, other, attr) other_lang = getattr(other, 'languages', []) if other_lang and other_lang != ['und']: self.languages = list(other_lang) if not getattr(self, 'series', None): self.series_index = None
def format_series_index(self, val=None): from calibre.ebooks.metadata import fmt_sidx v = self.series_index if val is None else val try: x = float(v) except Exception: x = 1 return fmt_sidx(x) def authors_from_string(self, raw): from calibre.ebooks.metadata import string_to_authors self.authors = string_to_authors(raw) def format_authors(self): from calibre.ebooks.metadata import authors_to_string return authors_to_string(self.authors) def format_tags(self): return ', '.join([str(t) for t in sorted(self.tags, key=sort_key)]) def format_rating(self, v=None, divide_by=1): if v is None: if self.rating is not None: return str(self.rating/divide_by) return 'None' return str(v/divide_by)
[документация] def format_field(self, key, series_with_index=True): ''' Returns the tuple (display_name, formatted_value) ''' name, val, ign, ign = self.format_field_extended(key, series_with_index) return (name, val)
def format_field_extended(self, key, series_with_index=True): from calibre.ebooks.metadata import authors_to_string ''' returns the tuple (display_name, formatted_value, original_value, field_metadata) ''' from calibre.utils.date import format_date # Handle custom series index if key.startswith('#') and key.endswith('_index'): tkey = key[:-6] # strip the _index cmeta = self.get_user_metadata(tkey, make_copy=False) if cmeta and cmeta['datatype'] == 'series': if self.get(tkey): res = self.get_extra(tkey) return (str(cmeta['name']+'_index'), self.format_series_index(res), res, cmeta) else: return (str(cmeta['name']+'_index'), '', '', cmeta) if key in self.custom_field_keys(): res = self.get(key, None) # get evaluates all necessary composites cmeta = self.get_user_metadata(key, make_copy=False) name = str(cmeta['name']) if res is None or res == '': # can't check "not res" because of numeric fields return (name, res, None, None) orig_res = res datatype = cmeta['datatype'] if datatype == 'text' and cmeta['is_multiple']: res = cmeta['is_multiple']['list_to_ui'].join(res) elif datatype == 'series' and series_with_index: if self.get_extra(key) is not None: res = res + \ ' [%s]'%self.format_series_index(val=self.get_extra(key)) elif datatype == 'datetime': res = format_date(res, cmeta['display'].get('date_format','dd MMM yyyy')) elif datatype == 'bool': res = _('Yes') if res else _('No') elif datatype == 'rating': res = '%.2g'%(res/2) elif datatype in ['int', 'float']: try: fmt = cmeta['display'].get('number_format', None) res = fmt.format(res) except: pass return (name, str(res), orig_res, cmeta) # convert top-level ids into their value if key in TOP_LEVEL_IDENTIFIERS: fmeta = field_metadata['identifiers'] name = key res = self.get(key, None) return (name, res, res, fmeta) # Translate aliases into the standard field name fmkey = field_metadata.search_term_to_field_key(key) if fmkey in field_metadata and field_metadata[fmkey]['kind'] == 'field': res = self.get(key, None) fmeta = field_metadata[fmkey] name = str(fmeta['name']) if res is None or res == '': return (name, res, None, None) orig_res = res name = str(fmeta['name']) datatype = fmeta['datatype'] if key == 'authors': res = authors_to_string(res) elif key == 'series_index': res = self.format_series_index(res) elif datatype == 'text' and fmeta['is_multiple']: if isinstance(res, dict): res = [k + ':' + v for k,v in res.items()] res = fmeta['is_multiple']['list_to_ui'].join(sorted(filter(None, res), key=sort_key)) elif datatype == 'series' and series_with_index: res = res + ' [%s]'%self.format_series_index() elif datatype == 'datetime': res = format_date(res, fmeta['display'].get('date_format','dd MMM yyyy')) elif datatype == 'rating': res = '%.2g'%(res/2) elif key == 'size': res = human_readable(res) return (name, str(res), orig_res, fmeta) return (None, None, None, None) def __unicode__representation__(self): ''' A string representation of this object, suitable for printing to console ''' from calibre.utils.date import isoformat from calibre.ebooks.metadata import authors_to_string ans = [] def fmt(x, y): ans.append('%-20s: %s'%(str(x), str(y))) fmt('Title', self.title) if self.title_sort: fmt('Title sort', self.title_sort) if self.authors: fmt('Author(s)', authors_to_string(self.authors) + ((' [' + self.author_sort + ']') if self.author_sort and self.author_sort != _('Unknown') else '')) if self.publisher: fmt('Publisher', self.publisher) if getattr(self, 'book_producer', False): fmt('Book Producer', self.book_producer) if self.tags: fmt('Tags', ', '.join([str(t) for t in self.tags])) if self.series: fmt('Series', self.series + ' #%s'%self.format_series_index()) if not self.is_null('languages'): fmt('Languages', ', '.join(self.languages)) if self.rating is not None: fmt('Rating', ('%.2g'%(float(self.rating)/2)) if self.rating else '') if self.timestamp is not None: fmt('Timestamp', isoformat(self.timestamp)) if self.pubdate is not None: fmt('Published', isoformat(self.pubdate)) if self.rights is not None: fmt('Rights', str(self.rights)) if self.identifiers: fmt('Identifiers', ', '.join(['%s:%s'%(k, v) for k, v in iteritems(self.identifiers)])) if self.comments: fmt('Comments', self.comments) for key in self.custom_field_keys(): val = self.get(key, None) if val: (name, val) = self.format_field(key) fmt(name, str(val)) return '\n'.join(ans)
[документация] def to_html(self): ''' A HTML representation of this object. ''' from calibre.ebooks.metadata import authors_to_string from calibre.utils.date import isoformat ans = [(_('Title'), str(self.title))] ans += [(_('Author(s)'), (authors_to_string(self.authors) if self.authors else _('Unknown')))] ans += [(_('Publisher'), str(self.publisher))] ans += [(_('Producer'), str(self.book_producer))] ans += [(_('Comments'), str(self.comments))] ans += [('ISBN', str(self.isbn))] ans += [(_('Tags'), ', '.join([str(t) for t in self.tags]))] if self.series: ans += [(ngettext('Series', 'Series', 1), str(self.series) + ' #%s'%self.format_series_index())] ans += [(_('Languages'), ', '.join(self.languages))] if self.timestamp is not None: ans += [(_('Timestamp'), str(isoformat(self.timestamp, as_utc=False, sep=' ')))] if self.pubdate is not None: ans += [(_('Published'), str(isoformat(self.pubdate, as_utc=False, sep=' ')))] if self.rights is not None: ans += [(_('Rights'), str(self.rights))] for key in self.custom_field_keys(): val = self.get(key, None) if val: (name, val) = self.format_field(key) ans += [(name, val)] for i, x in enumerate(ans): ans[i] = '<tr><td><b>%s</b></td><td>%s</td></tr>'%x return '<table>%s</table>'%'\n'.join(ans)
__str__ = __unicode__representation__ def __nonzero__(self): return bool(self.title or self.author or self.comments or self.tags) __bool__ = __nonzero__
# }}} def field_from_string(field, raw, field_metadata): ''' Parse the string raw to return an object that is suitable for calling set() on a Metadata object. ''' dt = field_metadata['datatype'] val = object if dt in {'int', 'float'}: val = int(raw) if dt == 'int' else float(raw) elif dt == 'rating': val = float(raw) * 2 elif dt == 'datetime': from calibre.utils.iso8601 import parse_iso8601 try: val = parse_iso8601(raw, require_aware=True) except Exception: from calibre.utils.date import parse_only_date val = parse_only_date(raw) elif dt == 'bool': if raw.lower() in {'true', 'yes', 'y'}: val = True elif raw.lower() in {'false', 'no', 'n'}: val = False else: raise ValueError('Unknown value for %s: %s'%(field, raw)) elif dt == 'text': ism = field_metadata['is_multiple'] if ism: val = [x.strip() for x in raw.split(ism['ui_to_list'])] if field == 'identifiers': val = {x.partition(':')[0]:x.partition(':')[-1] for x in val} elif field == 'languages': from calibre.utils.localization import canonicalize_lang val = [canonicalize_lang(x) for x in val] val = [x for x in val if x] if val is object: val = raw return val