Current File : //usr/lib/calibre/calibre/ebooks/metadata/book/base.py
#!/usr/bin/env python3
__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(',', '|')
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
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')
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)
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
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
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
def standard_field_keys(self):
'''
return a list of all possible keys, even if this book doesn't have them
'''
return STANDARD_METADATA_FIELDS
def custom_field_keys(self):
'''
return a list of the custom fields in this book
'''
return iter(object.__getattribute__(self, '_data')['user_metadata'])
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'])))
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)
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
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
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
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
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
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
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
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)
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('--------------')
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)
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)
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
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