#!/usr/bin/env python
# vim:fileencoding=utf-8
'''
Created on 13 Jan 2011
@author: charles
'''
__license__ = 'GPL v3'
__copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
__docformat__ = 'restructuredtext en'
import inspect, re, traceback, numbers
from math import trunc, floor, ceil, modf
from calibre import human_readable, prints
from calibre.constants import DEBUG
from calibre.ebooks.metadata import title_sort
from calibre.utils.config import tweaks
from calibre.utils.titlecase import titlecase
from calibre.utils.icu import capitalize, strcmp, sort_key
from calibre.utils.date import parse_date, format_date, now, UNDEFINED_DATE
from calibre.utils.localization import calibre_langcode_to_name, canonicalize_lang
from polyglot.builtins import iteritems, itervalues, unicode_type
class FormatterFunctions(object):
error_function_body = ('def evaluate(self, formatter, kwargs, mi, locals):\n'
'\treturn "' +
_('Duplicate user function name {0}. '
'Change the name or ensure that the functions are identical') + '"')
def __init__(self):
self._builtins = {}
self._functions = {}
self._functions_from_library = {}
def register_builtin(self, func_class):
if not isinstance(func_class, FormatterFunction):
raise ValueError('Class %s is not an instance of FormatterFunction'%(
func_class.__class__.__name__))
name = func_class.name
if name in self._functions:
raise ValueError('Name %s already used'%name)
self._builtins[name] = func_class
self._functions[name] = func_class
for a in func_class.aliases:
self._functions[a] = func_class
def _register_function(self, func_class, replace=False):
if not isinstance(func_class, FormatterFunction):
raise ValueError('Class %s is not an instance of FormatterFunction'%(
func_class.__class__.__name__))
name = func_class.name
if not replace and name in self._functions:
raise ValueError('Name %s already used'%name)
self._functions[name] = func_class
def register_functions(self, library_uuid, funcs):
self._functions_from_library[library_uuid] = funcs
self._register_functions()
def _register_functions(self):
for compiled_funcs in itervalues(self._functions_from_library):
for cls in compiled_funcs:
f = self._functions.get(cls.name, None)
replace = False
if f is not None:
existing_body = f.program_text
new_body = cls.program_text
if new_body != existing_body:
# Change the body of the template function to one that will
# return an error message. Also change the arg count to
# -1 (variable) to avoid template compilation errors
replace = True
func = [cls.name, '', -1, self.error_function_body.format(cls.name)]
cls = compile_user_function(*func)
else:
continue
formatter_functions()._register_function(cls, replace=replace)
def unregister_functions(self, library_uuid):
if library_uuid in self._functions_from_library:
for cls in self._functions_from_library[library_uuid]:
self._functions.pop(cls.name, None)
self._functions_from_library.pop(library_uuid)
self._register_functions()
def get_builtins(self):
return self._builtins
def get_builtins_and_aliases(self):
res = {}
for f in itervalues(self._builtins):
res[f.name] = f
for a in f.aliases:
res[a] = f
return res
def get_functions(self):
return self._functions
def reset_to_builtins(self):
self._functions = {}
for n,c in self._builtins.items():
self._functions[n] = c
for a in c.aliases:
self._functions[a] = c
_ff = FormatterFunctions()
def formatter_functions():
global _ff
return _ff
class FormatterFunction(object):
doc = _('No documentation provided')
name = 'no name provided'
category = 'Unknown'
arg_count = 0
aliases = []
is_python = True
def evaluate(self, formatter, kwargs, mi, locals, *args):
raise NotImplementedError()
def eval_(self, formatter, kwargs, mi, locals, *args):
ret = self.evaluate(formatter, kwargs, mi, locals, *args)
if isinstance(ret, (bytes, unicode_type)):
return ret
if isinstance(ret, list):
return ','.join(ret)
if isinstance(ret, (numbers.Number, bool)):
return unicode_type(ret)
class BuiltinFormatterFunction(FormatterFunction):
def __init__(self):
formatter_functions().register_builtin(self)
eval_func = inspect.getmembers(self.__class__,
lambda x: inspect.ismethod(x) and x.__name__ == 'evaluate')
try:
lines = [l[4:] for l in inspect.getsourcelines(eval_func[0][1])[0]]
except:
lines = []
self.program_text = ''.join(lines)
[docs]class BuiltinStrcmp(BuiltinFormatterFunction):
name = 'strcmp'
arg_count = 5
category = 'Relational'
__doc__ = doc = _('strcmp(x, y, lt, eq, gt) -- does a case-insensitive comparison of x '
'and y as strings. Returns lt if x < y. Returns eq if x == y. '
'Otherwise returns gt.')
def evaluate(self, formatter, kwargs, mi, locals, x, y, lt, eq, gt):
v = strcmp(x, y)
if v < 0:
return lt
if v == 0:
return eq
return gt
[docs]class BuiltinCmp(BuiltinFormatterFunction):
name = 'cmp'
category = 'Relational'
arg_count = 5
__doc__ = doc = _('cmp(x, y, lt, eq, gt) -- compares x and y after converting both to '
'numbers. Returns lt if x < y. Returns eq if x == y. Otherwise returns gt.')
def evaluate(self, formatter, kwargs, mi, locals, x, y, lt, eq, gt):
x = float(x if x and x != 'None' else 0)
y = float(y if y and y != 'None' else 0)
if x < y:
return lt
if x == y:
return eq
return gt
[docs]class BuiltinFirstMatchingCmp(BuiltinFormatterFunction):
name = 'first_matching_cmp'
category = 'Relational'
arg_count = -1
__doc__ = doc = _('first_matching_cmp(val, cmp1, result1, cmp2, r2, ..., else_result) -- '
'compares "val < cmpN" in sequence, returning resultN for '
'the first comparison that succeeds. Returns else_result '
'if no comparison succeeds. Example: '
'first_matching_cmp(10,5,"small",10,"middle",15,"large","giant") '
'returns "large". The same example with a first value of 16 returns "giant".')
def evaluate(self, formatter, kwargs, mi, locals, *args):
if (len(args) % 2) != 0:
raise ValueError(_('first_matching_cmp requires an even number of arguments'))
val = float(args[0] if args[0] and args[0] != 'None' else 0)
for i in range(1, len(args) - 1, 2):
c = float(args[i] if args[i] and args[i] != 'None' else 0)
if val < c:
return args[i+1]
return args[len(args)-1]
[docs]class BuiltinStrcat(BuiltinFormatterFunction):
name = 'strcat'
arg_count = -1
category = 'String manipulation'
__doc__ = doc = _('strcat(a, b, ...) -- can take any number of arguments. Returns a '
'string formed by concatenating all the arguments')
def evaluate(self, formatter, kwargs, mi, locals, *args):
i = 0
res = ''
for i in range(0, len(args)):
res += args[i]
return res
[docs]class BuiltinStrlen(BuiltinFormatterFunction):
name = 'strlen'
arg_count = 1
category = 'String manipulation'
__doc__ = doc = _('strlen(a) -- Returns the length of the string passed as '
'the argument')
def evaluate(self, formatter, kwargs, mi, locals, a):
try:
return len(a)
except:
return -1
[docs]class BuiltinAdd(BuiltinFormatterFunction):
name = 'add'
arg_count = 2
category = 'Arithmetic'
__doc__ = doc = _('add(x, y) -- returns x + y. Throws an exception if either x or y are not numbers.')
def evaluate(self, formatter, kwargs, mi, locals, x, y):
x = float(x if x and x != 'None' else 0)
y = float(y if y and y != 'None' else 0)
return unicode_type(x + y)
[docs]class BuiltinSubtract(BuiltinFormatterFunction):
name = 'subtract'
arg_count = 2
category = 'Arithmetic'
__doc__ = doc = _('subtract(x, y) -- returns x - y. Throws an exception if either x or y are not numbers.')
def evaluate(self, formatter, kwargs, mi, locals, x, y):
x = float(x if x and x != 'None' else 0)
y = float(y if y and y != 'None' else 0)
return unicode_type(x - y)
[docs]class BuiltinMultiply(BuiltinFormatterFunction):
name = 'multiply'
arg_count = 2
category = 'Arithmetic'
__doc__ = doc = _('multiply(x, y) -- returns x * y. Throws an exception if either x or y are not numbers.')
def evaluate(self, formatter, kwargs, mi, locals, x, y):
x = float(x if x and x != 'None' else 0)
y = float(y if y and y != 'None' else 0)
return unicode_type(x * y)
[docs]class BuiltinDivide(BuiltinFormatterFunction):
name = 'divide'
arg_count = 2
category = 'Arithmetic'
__doc__ = doc = _('divide(x, y) -- returns x / y. Throws an exception if either x or y are not numbers.')
def evaluate(self, formatter, kwargs, mi, locals, x, y):
x = float(x if x and x != 'None' else 0)
y = float(y if y and y != 'None' else 0)
return unicode_type(x / y)
[docs]class BuiltinCeiling(BuiltinFormatterFunction):
name = 'ceiling'
arg_count = 1
category = 'Arithmetic'
__doc__ = doc = _('ceiling(x) -- returns the smallest integer greater '
'than or equal to x. Throws an exception if x is '
'not a number.')
def evaluate(self, formatter, kwargs, mi, locals, x):
x = float(x if x and x != 'None' else 0)
return unicode_type(int(ceil(x)))
[docs]class BuiltinFloor(BuiltinFormatterFunction):
name = 'floor'
arg_count = 1
category = 'Arithmetic'
__doc__ = doc = _('floor(x) -- returns the largest integer less '
'than or equal to x. Throws an exception if x is '
'not a number.')
def evaluate(self, formatter, kwargs, mi, locals, x):
x = float(x if x and x != 'None' else 0)
return unicode_type(int(floor(x)))
[docs]class BuiltinRound(BuiltinFormatterFunction):
name = 'round'
arg_count = 1
category = 'Arithmetic'
__doc__ = doc = _('round(x) -- returns the nearest integer to x. '
'Throws an exception if x is not a number.')
def evaluate(self, formatter, kwargs, mi, locals, x):
x = float(x if x and x != 'None' else 0)
return unicode_type(int(round(x)))
[docs]class BuiltinMod(BuiltinFormatterFunction):
name = 'mod'
arg_count = 2
category = 'Arithmetic'
__doc__ = doc = _('mod(x) -- returns the remainder of x / y, where x, y, '
'and the result are integers. Throws an exception if '
'either x or y is not a number.')
def evaluate(self, formatter, kwargs, mi, locals, x, y):
x = float(x if x and x != 'None' else 0)
y = float(y if y and y != 'None' else 0)
return unicode_type(int(x % y))
[docs]class BuiltinFractionalPart(BuiltinFormatterFunction):
name = 'fractional_part'
arg_count = 1
category = 'Arithmetic'
__doc__ = doc = _('fractional_part(x) -- returns the value after the decimal '
'point. For example, fractional_part(3.14) returns 0.14. '
'Throws an exception if x is not a number.')
def evaluate(self, formatter, kwargs, mi, locals, x):
x = float(x if x and x != 'None' else 0)
return unicode_type(modf(x)[0])
[docs]class BuiltinTemplate(BuiltinFormatterFunction):
name = 'template'
arg_count = 1
category = 'Recursion'
__doc__ = doc = _('template(x) -- evaluates x as a template. The evaluation is done '
'in its own context, meaning that variables are not shared between '
'the caller and the template evaluation. Because the { and } '
'characters are special, you must use [[ for the { character and '
']] for the } character; they are converted automatically. '
'For example, template(\'[[title_sort]]\') will evaluate the '
'template {title_sort} and return its value. Note also that '
'prefixes and suffixes (the `|prefix|suffix` syntax) cannot be '
'used in the argument to this function when using template program mode.')
def evaluate(self, formatter, kwargs, mi, locals, template):
template = template.replace('[[', '{').replace(']]', '}')
return formatter.__class__().safe_format(template, kwargs, 'TEMPLATE', mi)
[docs]class BuiltinEval(BuiltinFormatterFunction):
name = 'eval'
arg_count = 1
category = 'Recursion'
__doc__ = doc = _('eval(template) -- evaluates the template, passing the local '
'variables (those \'assign\'ed to) instead of the book metadata. '
' This permits using the template processor to construct complex '
'results from local variables. Because the { and } '
'characters are special, you must use [[ for the { character and '
']] for the } character; they are converted automatically. '
'Note also that prefixes and suffixes (the `|prefix|suffix` syntax) '
'cannot be used in the argument to this function when using '
'template program mode.')
def evaluate(self, formatter, kwargs, mi, locals, template):
from calibre.utils.formatter import EvalFormatter
template = template.replace('[[', '{').replace(']]', '}')
return EvalFormatter().safe_format(template, locals, 'EVAL', None)
[docs]class BuiltinAssign(BuiltinFormatterFunction):
name = 'assign'
arg_count = 2
category = 'Other'
__doc__ = doc = _('assign(id, val) -- assigns val to id, then returns val. '
'id must be an identifier, not an expression')
def evaluate(self, formatter, kwargs, mi, locals, target, value):
locals[target] = value
return value
[docs]class BuiltinPrint(BuiltinFormatterFunction):
name = 'print'
arg_count = -1
category = 'Other'
__doc__ = doc = _('print(a, b, ...) -- prints the arguments to standard output. '
'Unless you start calibre from the command line (calibre-debug -g), '
'the output will go to a black hole.')
def evaluate(self, formatter, kwargs, mi, locals, *args):
print(args)
return ''
[docs]class BuiltinField(BuiltinFormatterFunction):
name = 'field'
arg_count = 1
category = 'Get values from metadata'
__doc__ = doc = _('field(name) -- returns the metadata field named by name')
def evaluate(self, formatter, kwargs, mi, locals, name):
return formatter.get_value(name, [], kwargs)
[docs]class BuiltinRawField(BuiltinFormatterFunction):
name = 'raw_field'
arg_count = 1
category = 'Get values from metadata'
__doc__ = doc = _('raw_field(name) -- returns the metadata field named by name '
'without applying any formatting.')
def evaluate(self, formatter, kwargs, mi, locals, name):
res = getattr(mi, name, None)
if isinstance(res, list):
fm = mi.metadata_for_field(name)
if fm is None:
return ', '.join(res)
return fm['is_multiple']['list_to_ui'].join(res)
return unicode_type(res)
[docs]class BuiltinRawList(BuiltinFormatterFunction):
name = 'raw_list'
arg_count = 2
category = 'Get values from metadata'
__doc__ = doc = _('raw_list(name, separator) -- returns the metadata list '
'named by name without applying any formatting or sorting and '
'with items separated by separator.')
def evaluate(self, formatter, kwargs, mi, locals, name, separator):
res = getattr(mi, name, None)
if not isinstance(res, list):
return "%s is not a list" % name
return separator.join(res)
[docs]class BuiltinSubstr(BuiltinFormatterFunction):
name = 'substr'
arg_count = 3
category = 'String manipulation'
__doc__ = doc = _('substr(str, start, end) -- returns the start\'th through the end\'th '
'characters of str. The first character in str is the zero\'th '
'character. If end is negative, then it indicates that many '
'characters counting from the right. If end is zero, then it '
'indicates the last character. For example, substr(\'12345\', 1, 0) '
'returns \'2345\', and substr(\'12345\', 1, -1) returns \'234\'.')
def evaluate(self, formatter, kwargs, mi, locals, str_, start_, end_):
return str_[int(start_): len(str_) if int(end_) == 0 else int(end_)]
[docs]class BuiltinLookup(BuiltinFormatterFunction):
name = 'lookup'
arg_count = -1
category = 'Iterating over values'
__doc__ = doc = _('lookup(val, pattern, field, pattern, field, ..., else_field) -- '
'like switch, except the arguments are field (metadata) names, not '
'text. The value of the appropriate field will be fetched and used. '
'Note that because composite columns are fields, you can use this '
'function in one composite field to use the value of some other '
'composite field. This is extremely useful when constructing '
'variable save paths')
def evaluate(self, formatter, kwargs, mi, locals, val, *args):
if len(args) == 2: # here for backwards compatibility
if val:
return formatter.vformat('{'+args[0].strip()+'}', [], kwargs)
else:
return formatter.vformat('{'+args[1].strip()+'}', [], kwargs)
if (len(args) % 2) != 1:
raise ValueError(_('lookup requires either 2 or an odd number of arguments'))
i = 0
while i < len(args):
if i + 1 >= len(args):
return formatter.vformat('{' + args[i].strip() + '}', [], kwargs)
if re.search(args[i], val, flags=re.I):
return formatter.vformat('{'+args[i+1].strip() + '}', [], kwargs)
i += 2
[docs]class BuiltinTest(BuiltinFormatterFunction):
name = 'test'
arg_count = 3
category = 'If-then-else'
__doc__ = doc = _('test(val, text if not empty, text if empty) -- return `text if not '
'empty` if val is not empty, otherwise return `text if empty`')
def evaluate(self, formatter, kwargs, mi, locals, val, value_if_set, value_not_set):
if val:
return value_if_set
else:
return value_not_set
[docs]class BuiltinContains(BuiltinFormatterFunction):
name = 'contains'
arg_count = 4
category = 'If-then-else'
__doc__ = doc = _('contains(val, pattern, text if match, text if not match) -- checks '
'if val contains matches for the regular expression `pattern`. '
'Returns `text if match` if matches are found, otherwise it returns '
'`text if no match`')
def evaluate(self, formatter, kwargs, mi, locals,
val, test, value_if_present, value_if_not):
if re.search(test, val, flags=re.I):
return value_if_present
else:
return value_if_not
[docs]class BuiltinSwitch(BuiltinFormatterFunction):
name = 'switch'
arg_count = -1
category = 'Iterating over values'
__doc__ = doc = _('switch(val, pattern, value, pattern, value, ..., else_value) -- '
'for each `pattern, value` pair, checks if `val` matches '
'the regular expression `pattern` and if so, returns that '
'`value`. If no pattern matches, then `else_value` is returned. '
'You can have as many `pattern, value` pairs as you want')
def evaluate(self, formatter, kwargs, mi, locals, val, *args):
if (len(args) % 2) != 1:
raise ValueError(_('switch requires an odd number of arguments'))
i = 0
while i < len(args):
if i + 1 >= len(args):
return args[i]
if re.search(args[i], val, flags=re.I):
return args[i+1]
i += 2
[docs]class BuiltinStrcatMax(BuiltinFormatterFunction):
name = 'strcat_max'
arg_count = -1
category = 'String manipulation'
__doc__ = doc = _('strcat_max(max, string1, prefix2, string2, ...) -- '
'Returns a string formed by concatenating the arguments. The '
'returned value is initialized to string1. `Prefix, string` '
'pairs are added to the end of the value as long as the '
'resulting string length is less than `max`. String1 is returned '
'even if string1 is longer than max. You can pass as many '
'`prefix, string` pairs as you wish.')
def evaluate(self, formatter, kwargs, mi, locals, *args):
if len(args) < 2:
raise ValueError(_('strcat_max requires 2 or more arguments'))
if (len(args) % 2) != 0:
raise ValueError(_('strcat_max requires an even number of arguments'))
try:
max = int(args[0])
except:
raise ValueError(_('first argument to strcat_max must be an integer'))
i = 2
result = args[1]
try:
while i < len(args):
if (len(result) + len(args[i]) + len(args[i+1])) > max:
break
result = result + args[i] + args[i+1]
i += 2
except:
pass
return result.strip()
[docs]class BuiltinInList(BuiltinFormatterFunction):
name = 'in_list'
arg_count = -1
category = 'List lookup'
__doc__ = doc = _('in_list(val, separator, pattern, found_val, ..., not_found_val) -- '
'treat val as a list of items separated by separator, '
'evaluating the pattern against each value in the list. If the '
'pattern matches a value, return found_val, otherwise return '
'not_found_val. The pattern and found_value can be repeated as '
'many times as desired, permitting returning different values '
'depending on the search. The patterns are checked in order. The '
'first match is returned.')
def evaluate(self, formatter, kwargs, mi, locals, val, sep, *args):
if (len(args) % 2) != 1:
raise ValueError(_('in_list requires an odd number of arguments'))
l = [v.strip() for v in val.split(sep) if v.strip()]
i = 0
while i < len(args):
if i + 1 >= len(args):
return args[i]
sf = args[i]
fv = args[i+1]
if l:
for v in l:
if re.search(sf, v, flags=re.I):
return fv
i += 2
[docs]class BuiltinStrInList(BuiltinFormatterFunction):
name = 'str_in_list'
arg_count = -1
category = 'List lookup'
__doc__ = doc = _('str_in_list(val, separator, string, found_val, ..., not_found_val) -- '
'treat val as a list of items separated by separator, '
'comparing the string against each value in the list. If the '
'string matches a value (ignoring case) then return found_val, otherwise return '
'not_found_val. If the string contains separators, then it is '
'also treated as a list and each value is checked. The string and '
'found_value can be repeated as many times as desired, permitting '
'returning different values depending on the search. The strings are '
'checked in order. The first match is returned.')
def evaluate(self, formatter, kwargs, mi, locals, val, sep, *args):
if (len(args) % 2) != 1:
raise ValueError(_('str_in_list requires an odd number of arguments'))
l = [v.strip() for v in val.split(sep) if v.strip()]
i = 0
while i < len(args):
if i + 1 >= len(args):
return args[i]
sf = args[i]
fv = args[i+1]
c = [v.strip() for v in sf.split(sep) if v.strip()]
if l:
for v in l:
for t in c:
if strcmp(t, v) == 0:
return fv
i += 2
[docs]class BuiltinIdentifierInList(BuiltinFormatterFunction):
name = 'identifier_in_list'
arg_count = 4
category = 'List lookup'
__doc__ = doc = _('identifier_in_list(val, id, found_val, not_found_val) -- '
'treat val as a list of identifiers separated by commas, '
'comparing the string against each value in the list. An identifier '
'has the format "identifier:value". The id parameter should be '
'either "id" or "id:regexp". The first case matches if there is any '
'identifier with that id. The second case matches if the regexp '
'matches the identifier\'s value. If there is a match, '
'return found_val, otherwise return not_found_val.')
def evaluate(self, formatter, kwargs, mi, locals, val, ident, fv, nfv):
l = [v.strip() for v in val.split(',') if v.strip()]
(id, _, regexp) = ident.partition(':')
if not id:
return nfv
id += ':'
if l:
for v in l:
if v.startswith(id):
if not regexp or re.search(regexp, v[len(id):], flags=re.I):
return fv
return nfv
[docs]class BuiltinRe(BuiltinFormatterFunction):
name = 're'
arg_count = 3
category = 'String manipulation'
__doc__ = doc = _('re(val, pattern, replacement) -- return val after applying '
'the regular expression. All instances of `pattern` are replaced '
'with `replacement`. As in all of calibre, these are '
'Python-compatible regular expressions')
def evaluate(self, formatter, kwargs, mi, locals, val, pattern, replacement):
return re.sub(pattern, replacement, val, flags=re.I)
[docs]class BuiltinReGroup(BuiltinFormatterFunction):
name = 're_group'
arg_count = -1
category = 'String manipulation'
__doc__ = doc = _('re_group(val, pattern, template_for_group_1, for_group_2, ...) -- '
'return a string made by applying the regular expression pattern '
'to the val and replacing each matched instance with the string '
'computed by replacing each matched group by the value returned '
'by the corresponding template. The original matched value for the '
'group is available as $. In template program mode, like for '
'the template and the eval functions, you use [[ for { and ]] for }.'
' The following example in template program mode looks for series '
'with more than one word and uppercases the first word: '
"{series:'re_group($, \"(\\S* )(.*)\", \"[[$:uppercase()]]\", \"[[$]]\")'}")
def evaluate(self, formatter, kwargs, mi, locals, val, pattern, *args):
from calibre.utils.formatter import EvalFormatter
def repl(mo):
res = ''
if mo and mo.lastindex:
for dex in range(0, mo.lastindex):
gv = mo.group(dex+1)
if gv is None:
continue
if len(args) > dex:
template = args[dex].replace('[[', '{').replace(']]', '}')
res += EvalFormatter().safe_format(template, {'$': gv},
'EVAL', None, strip_results=False)
else:
res += gv
return res
return re.sub(pattern, repl, val, flags=re.I)
[docs]class BuiltinSwapAroundComma(BuiltinFormatterFunction):
name = 'swap_around_comma'
arg_count = 1
category = 'String manipulation'
__doc__ = doc = _('swap_around_comma(val) -- given a value of the form '
'"B, A", return "A B". This is most useful for converting names '
'in LN, FN format to FN LN. If there is no comma, the function '
'returns val unchanged')
def evaluate(self, formatter, kwargs, mi, locals, val):
return re.sub(r'^(.*?),\s*(.*$)', r'\2 \1', val, flags=re.I).strip()
[docs]class BuiltinIfempty(BuiltinFormatterFunction):
name = 'ifempty'
arg_count = 2
category = 'If-then-else'
__doc__ = doc = _('ifempty(val, text if empty) -- return val if val is not empty, '
'otherwise return `text if empty`')
def evaluate(self, formatter, kwargs, mi, locals, val, value_if_empty):
if val:
return val
else:
return value_if_empty
[docs]class BuiltinShorten(BuiltinFormatterFunction):
name = 'shorten'
arg_count = 4
category = 'String manipulation'
__doc__ = doc = _('shorten(val, left chars, middle text, right chars) -- Return a '
'shortened version of val, consisting of `left chars` '
'characters from the beginning of val, followed by '
'`middle text`, followed by `right chars` characters from '
'the end of the string. `Left chars` and `right chars` must be '
'integers. For example, assume the title of the book is '
'`Ancient English Laws in the Times of Ivanhoe`, and you want '
'it to fit in a space of at most 15 characters. If you use '
'{title:shorten(9,-,5)}, the result will be `Ancient E-nhoe`. '
'If the field\'s length is less than left chars + right chars + '
'the length of `middle text`, then the field will be used '
'intact. For example, the title `The Dome` would not be changed.')
def evaluate(self, formatter, kwargs, mi, locals,
val, leading, center_string, trailing):
l = max(0, int(leading))
t = max(0, int(trailing))
if len(val) > l + len(center_string) + t:
return val[0:l] + center_string + ('' if t == 0 else val[-t:])
else:
return val
[docs]class BuiltinCount(BuiltinFormatterFunction):
name = 'count'
arg_count = 2
category = 'List manipulation'
__doc__ = doc = _('count(val, separator) -- interprets the value as a list of items '
'separated by `separator`, returning the number of items in the '
'list. Most lists use a comma as the separator, but authors '
'uses an ampersand. Examples: {tags:count(,)}, {authors:count(&)}')
def evaluate(self, formatter, kwargs, mi, locals, val, sep):
return unicode_type(len([v for v in val.split(sep) if v]))
[docs]class BuiltinListitem(BuiltinFormatterFunction):
name = 'list_item'
arg_count = 3
category = 'List lookup'
__doc__ = doc = _('list_item(val, index, separator) -- interpret the value as a list of '
'items separated by `separator`, returning the `index`th item. '
'The first item is number zero. The last item can be returned '
'using `list_item(-1,separator)`. If the item is not in the list, '
'then the empty value is returned. The separator has the same '
'meaning as in the count function.')
def evaluate(self, formatter, kwargs, mi, locals, val, index, sep):
if not val:
return ''
index = int(index)
val = val.split(sep)
try:
return val[index].strip()
except:
return ''
[docs]class BuiltinSelect(BuiltinFormatterFunction):
name = 'select'
arg_count = 2
category = 'List lookup'
__doc__ = doc = _('select(val, key) -- interpret the value as a comma-separated list '
'of items, with the items being "id:value". Find the pair with the '
'id equal to key, and return the corresponding value.'
)
def evaluate(self, formatter, kwargs, mi, locals, val, key):
if not val:
return ''
vals = [v.strip() for v in val.split(',')]
for v in vals:
if v.startswith(key+':'):
return v[len(key)+1:]
return ''
[docs]class BuiltinHumanReadable(BuiltinFormatterFunction):
name = 'human_readable'
arg_count = 1
category = 'Formatting values'
__doc__ = doc = _('human_readable(v) -- return a string '
'representing the number v in KB, MB, GB, etc.'
)
def evaluate(self, formatter, kwargs, mi, locals, val):
try:
return human_readable(round(float(val)))
except:
return ''
[docs]class BuiltinSublist(BuiltinFormatterFunction):
name = 'sublist'
arg_count = 4
category = 'List manipulation'
__doc__ = doc = _('sublist(val, start_index, end_index, separator) -- interpret the '
'value as a list of items separated by `separator`, returning a '
'new list made from the `start_index` to the `end_index` item. '
'The first item is number zero. If an index is negative, then it '
'counts from the end of the list. As a special case, an end_index '
'of zero is assumed to be the length of the list. Examples using '
'basic template mode and assuming that the tags column (which is '
'comma-separated) contains "A, B, C": '
'{tags:sublist(0,1,\\\\,)} returns "A". '
'{tags:sublist(-1,0,\\\\,)} returns "C". '
'{tags:sublist(0,-1,\\\\,)} returns "A, B".'
)
def evaluate(self, formatter, kwargs, mi, locals, val, start_index, end_index, sep):
if not val:
return ''
si = int(start_index)
ei = int(end_index)
# allow empty list items so counts are what the user expects
val = [v.strip() for v in val.split(sep)]
if sep == ',':
sep = ', '
try:
if ei == 0:
return sep.join(val[si:])
else:
return sep.join(val[si:ei])
except:
return ''
[docs]class BuiltinSubitems(BuiltinFormatterFunction):
name = 'subitems'
arg_count = 3
category = 'List manipulation'
__doc__ = doc = _('subitems(val, start_index, end_index) -- This function is used to '
'break apart lists of items such as genres. It interprets the value '
'as a comma-separated list of items, where each item is a period-'
'separated list. Returns a new list made by first finding all the '
'period-separated items, then for each such item extracting the '
'`start_index` to the `end_index` components, then combining '
'the results back together. The first component in a period-'
'separated list has an index of zero. If an index is negative, '
'then it counts from the end of the list. As a special case, an '
'end_index of zero is assumed to be the length of the list. '
'Example using basic template mode and assuming a #genre value of '
'"A.B.C": {#genre:subitems(0,1)} returns "A". {#genre:subitems(0,2)} '
'returns "A.B". {#genre:subitems(1,0)} returns "B.C". Assuming a #genre '
'value of "A.B.C, D.E.F", {#genre:subitems(0,1)} returns "A, D". '
'{#genre:subitems(0,2)} returns "A.B, D.E"')
period_pattern = re.compile(r'(?<=[^\.\s])\.(?=[^\.\s])', re.U)
def evaluate(self, formatter, kwargs, mi, locals, val, start_index, end_index):
if not val:
return ''
si = int(start_index)
ei = int(end_index)
has_periods = '.' in val
items = [v.strip() for v in val.split(',')]
rv = set()
for item in items:
if has_periods and '.' in item:
components = self.period_pattern.split(item)
else:
components = [item]
try:
if ei == 0:
rv.add('.'.join(components[si:]))
else:
rv.add('.'.join(components[si:ei]))
except:
pass
return ', '.join(sorted(rv, key=sort_key))
[docs]class BuiltinUppercase(BuiltinFormatterFunction):
name = 'uppercase'
arg_count = 1
category = 'String case changes'
__doc__ = doc = _('uppercase(val) -- return val in upper case')
def evaluate(self, formatter, kwargs, mi, locals, val):
return val.upper()
[docs]class BuiltinLowercase(BuiltinFormatterFunction):
name = 'lowercase'
arg_count = 1
category = 'String case changes'
__doc__ = doc = _('lowercase(val) -- return val in lower case')
def evaluate(self, formatter, kwargs, mi, locals, val):
return val.lower()
[docs]class BuiltinTitlecase(BuiltinFormatterFunction):
name = 'titlecase'
arg_count = 1
category = 'String case changes'
__doc__ = doc = _('titlecase(val) -- return val in title case')
def evaluate(self, formatter, kwargs, mi, locals, val):
return titlecase(val)
[docs]class BuiltinCapitalize(BuiltinFormatterFunction):
name = 'capitalize'
arg_count = 1
category = 'String case changes'
__doc__ = doc = _('capitalize(val) -- return val capitalized')
def evaluate(self, formatter, kwargs, mi, locals, val):
return capitalize(val)
[docs]class BuiltinBooksize(BuiltinFormatterFunction):
name = 'booksize'
arg_count = 0
category = 'Get values from metadata'
__doc__ = doc = _('booksize() -- return value of the size field. '
'This function works only in the GUI. If you want to use this value '
'in save-to-disk or send-to-device templates then you '
'must make a custom "Column built from other columns", use '
'the function in that column\'s template, and use that '
'column\'s value in your save/send templates')
def evaluate(self, formatter, kwargs, mi, locals):
if hasattr(mi, '_proxy_metadata'):
try:
v = mi._proxy_metadata.book_size
if v is not None:
return unicode_type(mi._proxy_metadata.book_size)
return ''
except:
pass
return ''
return _('This function can be used only in the GUI')
[docs]class BuiltinOndevice(BuiltinFormatterFunction):
name = 'ondevice'
arg_count = 0
category = 'Get values from metadata'
__doc__ = doc = _('ondevice() -- return Yes if ondevice is set, otherwise return '
'the empty string. This function works only in the GUI. If you want to '
'use this value in save-to-disk or send-to-device templates then you '
'must make a custom "Column built from other columns", use '
'the function in that column\'s template, and use that '
'column\'s value in your save/send templates')
def evaluate(self, formatter, kwargs, mi, locals):
if hasattr(mi, '_proxy_metadata'):
if mi._proxy_metadata.ondevice_col:
return _('Yes')
return ''
return _('This function can be used only in the GUI')
[docs]class BuiltinAnnotationCount(BuiltinFormatterFunction):
name = 'annotation_count'
arg_count = 0
category = 'Get values from metadata'
__doc__ = doc = _('annotation_count() -- return the total number of annotations '
'of all types attached to the current book. '
'This function works only in the GUI.')
def evaluate(self, formatter, kwargs, mi, locals):
if hasattr(mi, '_proxy_metadata'):
try:
from calibre.gui2.ui import get_gui
c = get_gui().current_db.new_api.annotation_count_for_book(mi.id)
return '' if c == 0 else unicode_type(c)
except:
return _('Failed to fetch annotation count')
return ''
return _('This function can be used only in the GUI')
[docs]class BuiltinSeriesSort(BuiltinFormatterFunction):
name = 'series_sort'
arg_count = 0
category = 'Get values from metadata'
__doc__ = doc = _('series_sort() -- return the series sort value')
def evaluate(self, formatter, kwargs, mi, locals):
if mi.series:
return title_sort(mi.series)
return ''
[docs]class BuiltinHasCover(BuiltinFormatterFunction):
name = 'has_cover'
arg_count = 0
category = 'Get values from metadata'
__doc__ = doc = _('has_cover() -- return Yes if the book has a cover, '
'otherwise return the empty string')
def evaluate(self, formatter, kwargs, mi, locals):
if mi.has_cover:
return _('Yes')
return ''
[docs]class BuiltinFirstNonEmpty(BuiltinFormatterFunction):
name = 'first_non_empty'
arg_count = -1
category = 'Iterating over values'
__doc__ = doc = _('first_non_empty(value, value, ...) -- '
'returns the first value that is not empty. If all values are '
'empty, then the empty value is returned. '
'You can have as many values as you want.')
def evaluate(self, formatter, kwargs, mi, locals, *args):
i = 0
while i < len(args):
if args[i]:
return args[i]
i += 1
return ''
[docs]class BuiltinAnd(BuiltinFormatterFunction):
name = 'and'
arg_count = -1
category = 'Boolean'
__doc__ = doc = _('and(value, value, ...) -- '
'returns the string "1" if all values are not empty, otherwise '
'returns the empty string. This function works well with test or '
'first_non_empty. You can have as many values as you want. ')
def evaluate(self, formatter, kwargs, mi, locals, *args):
i = 0
while i < len(args):
if not args[i]:
return ''
i += 1
return '1'
[docs]class BuiltinOr(BuiltinFormatterFunction):
name = 'or'
arg_count = -1
category = 'Boolean'
__doc__ = doc = _('or(value, value, ...) -- '
'returns the string "1" if any value is not empty, otherwise '
'returns the empty string. This function works well with test or '
'first_non_empty. You can have as many values as you want.')
def evaluate(self, formatter, kwargs, mi, locals, *args):
i = 0
while i < len(args):
if args[i]:
return '1'
i += 1
return ''
[docs]class BuiltinNot(BuiltinFormatterFunction):
name = 'not'
arg_count = 1
category = 'Boolean'
__doc__ = doc = _('not(value) -- '
'returns the string "1" if the value is empty, otherwise '
'returns the empty string. This function works well with test or '
'first_non_empty.')
def evaluate(self, formatter, kwargs, mi, locals, val):
return '' if val else '1'
[docs]class BuiltinListUnion(BuiltinFormatterFunction):
name = 'list_union'
arg_count = 3
category = 'List manipulation'
__doc__ = doc = _('list_union(list1, list2, separator) -- '
'return a list made by merging the items in list1 and list2, '
'removing duplicate items using a case-insensitive comparison. If '
'items differ in case, the one in list1 is used. '
'The items in list1 and list2 are separated by separator, as are '
'the items in the returned list.')
aliases = ['merge_lists']
def evaluate(self, formatter, kwargs, mi, locals, list1, list2, separator):
res = [l.strip() for l in list1.split(separator) if l.strip()]
l2 = [l.strip() for l in list2.split(separator) if l.strip()]
lcl1 = {icu_lower(l) for l in res}
for i in l2:
if icu_lower(i) not in lcl1 and i not in res:
res.append(i)
if separator == ',':
return ', '.join(res)
return separator.join(res)
[docs]class BuiltinListDifference(BuiltinFormatterFunction):
name = 'list_difference'
arg_count = 3
category = 'List manipulation'
__doc__ = doc = _('list_difference(list1, list2, separator) -- '
'return a list made by removing from list1 any item found in list2, '
'using a case-insensitive comparison. The items in list1 and list2 '
'are separated by separator, as are the items in the returned list.')
def evaluate(self, formatter, kwargs, mi, locals, list1, list2, separator):
l1 = [l.strip() for l in list1.split(separator) if l.strip()]
l2 = {icu_lower(l.strip()) for l in list2.split(separator) if l.strip()}
res = []
for i in l1:
if icu_lower(i) not in l2 and i not in res:
res.append(i)
if separator == ',':
return ', '.join(res)
return separator.join(res)
[docs]class BuiltinListIntersection(BuiltinFormatterFunction):
name = 'list_intersection'
arg_count = 3
category = 'List manipulation'
__doc__ = doc = _('list_intersection(list1, list2, separator) -- '
'return a list made by removing from list1 any item not found in list2, '
'using a case-insensitive comparison. The items in list1 and list2 '
'are separated by separator, as are the items in the returned list.')
def evaluate(self, formatter, kwargs, mi, locals, list1, list2, separator):
l1 = [l.strip() for l in list1.split(separator) if l.strip()]
l2 = {icu_lower(l.strip()) for l in list2.split(separator) if l.strip()}
res = []
for i in l1:
if icu_lower(i) in l2 and i not in res:
res.append(i)
if separator == ',':
return ', '.join(res)
return separator.join(res)
[docs]class BuiltinListSort(BuiltinFormatterFunction):
name = 'list_sort'
arg_count = 3
category = 'List manipulation'
__doc__ = doc = _('list_sort(list, direction, separator) -- '
'return list sorted using a case-insensitive sort. If direction is '
'zero, the list is sorted ascending, otherwise descending. The list items '
'are separated by separator, as are the items in the returned list.')
def evaluate(self, formatter, kwargs, mi, locals, list1, direction, separator):
res = [l.strip() for l in list1.split(separator) if l.strip()]
if separator == ',':
return ', '.join(sorted(res, key=sort_key, reverse=direction != "0"))
return separator.join(sorted(res, key=sort_key, reverse=direction != "0"))
[docs]class BuiltinListEquals(BuiltinFormatterFunction):
name = 'list_equals'
arg_count = 6
category = 'List manipulation'
__doc__ = doc = _('list_equals(list1, sep1, list2, sep2, yes_val, no_val) -- '
'return yes_val if list1 and list2 contain the same items, '
'otherwise return no_val. The items are determined by splitting '
'each list using the appropriate separator character (sep1 or '
'sep2). The order of items in the lists is not relevant. '
'The comparison is case insensitive.')
def evaluate(self, formatter, kwargs, mi, locals, list1, sep1, list2, sep2, yes_val, no_val):
s1 = {icu_lower(l.strip()) for l in list1.split(sep1) if l.strip()}
s2 = {icu_lower(l.strip()) for l in list2.split(sep2) if l.strip()}
if s1 == s2:
return yes_val
return no_val
[docs]class BuiltinListRe(BuiltinFormatterFunction):
name = 'list_re'
arg_count = 4
category = 'List manipulation'
__doc__ = doc = _('list_re(src_list, separator, include_re, opt_replace) -- '
'Construct a list by first separating src_list into items using '
'the separator character. For each item in the list, check if it '
'matches include_re. If it does, then add it to the list to be '
'returned. If opt_replace is not the empty string, then apply the '
'replacement before adding the item to the returned list.')
def evaluate(self, formatter, kwargs, mi, locals, src_list, separator, include_re, opt_replace):
l = [l.strip() for l in src_list.split(separator) if l.strip()]
res = []
for item in l:
if re.search(include_re, item, flags=re.I) is not None:
if opt_replace:
item = re.sub(include_re, opt_replace, item)
for i in [t.strip() for t in item.split(separator) if t.strip()]:
if i not in res:
res.append(i)
if separator == ',':
return ', '.join(res)
return separator.join(res)
[docs]class BuiltinListReGroup(BuiltinFormatterFunction):
name = 'list_re_group'
arg_count = -1
category = 'List manipulation'
__doc__ = doc = _('list_re_group(src_list, separator, include_re, search_re, group_1_template, ...) -- '
'Like list_re except replacements are not optional. It '
'uses re_group(list_item, search_re, group_1_template, ...) when '
'doing the replacements on the resulting list.')
def evaluate(self, formatter, kwargs, mi, locals, src_list, separator, include_re,
search_re, *args):
from calibre.utils.formatter import EvalFormatter
l = [l.strip() for l in src_list.split(separator) if l.strip()]
res = []
for item in l:
def repl(mo):
newval = ''
if mo and mo.lastindex:
for dex in range(0, mo.lastindex):
gv = mo.group(dex+1)
if gv is None:
continue
if len(args) > dex:
template = args[dex].replace('[[', '{').replace(']]', '}')
newval += EvalFormatter().safe_format(template, {'$': gv},
'EVAL', None, strip_results=False)
else:
newval += gv
return newval
if re.search(include_re, item, flags=re.I) is not None:
item = re.sub(search_re, repl, item, flags=re.I)
for i in [t.strip() for t in item.split(separator) if t.strip()]:
if i not in res:
res.append(i)
if separator == ',':
return ', '.join(res)
return separator.join(res)
[docs]class BuiltinToday(BuiltinFormatterFunction):
name = 'today'
arg_count = 0
category = 'Date functions'
__doc__ = doc = _('today() -- '
'return a date string for today. This value is designed for use in '
'format_date or days_between, but can be manipulated like any '
'other string. The date is in ISO format.')
def evaluate(self, formatter, kwargs, mi, locals):
return format_date(now(), 'iso')
[docs]class BuiltinDaysBetween(BuiltinFormatterFunction):
name = 'days_between'
arg_count = 2
category = 'Date functions'
__doc__ = doc = _('days_between(date1, date2) -- '
'return the number of days between date1 and date2. The number is '
'positive if date1 is greater than date2, otherwise negative. If '
'either date1 or date2 are not dates, the function returns the '
'empty string.')
def evaluate(self, formatter, kwargs, mi, locals, date1, date2):
try:
d1 = parse_date(date1)
if d1 == UNDEFINED_DATE:
return ''
d2 = parse_date(date2)
if d2 == UNDEFINED_DATE:
return ''
except:
return ''
i = d1 - d2
return '%.1f'%(i.days + (i.seconds/(24.0*60.0*60.0)))
[docs]class BuiltinLanguageStrings(BuiltinFormatterFunction):
name = 'language_strings'
arg_count = 2
category = 'Get values from metadata'
__doc__ = doc = _('language_strings(lang_codes, localize) -- '
'return the strings for the language codes passed in lang_codes. '
'If localize is zero, return the strings in English. If '
'localize is not zero, return the strings in the language of '
'the current locale. Lang_codes is a comma-separated list.')
def evaluate(self, formatter, kwargs, mi, locals, lang_codes, localize):
retval = []
for c in [c.strip() for c in lang_codes.split(',') if c.strip()]:
try:
n = calibre_langcode_to_name(c, localize != '0')
if n:
retval.append(n)
except:
pass
return ', '.join(retval)
[docs]class BuiltinLanguageCodes(BuiltinFormatterFunction):
name = 'language_codes'
arg_count = 1
category = 'Get values from metadata'
__doc__ = doc = _('language_codes(lang_strings) -- '
'return the language codes for the strings passed in lang_strings. '
'The strings must be in the language of the current locale. '
'Lang_strings is a comma-separated list.')
def evaluate(self, formatter, kwargs, mi, locals, lang_strings):
retval = []
for c in [c.strip() for c in lang_strings.split(',') if c.strip()]:
try:
cv = canonicalize_lang(c)
if cv:
retval.append(canonicalize_lang(cv))
except:
pass
return ', '.join(retval)
[docs]class BuiltinCurrentLibraryName(BuiltinFormatterFunction):
name = 'current_library_name'
arg_count = 0
category = 'Get values from metadata'
__doc__ = doc = _('current_library_name() -- '
'return the last name on the path to the current calibre library. '
'This function can be called in template program mode using the '
'template "{:\'current_library_name()\'}".')
def evaluate(self, formatter, kwargs, mi, locals):
from calibre.library import current_library_name
return current_library_name()
[docs]class BuiltinCurrentLibraryPath(BuiltinFormatterFunction):
name = 'current_library_path'
arg_count = 0
category = 'Get values from metadata'
__doc__ = doc = _('current_library_path() -- '
'return the path to the current calibre library. This function can '
'be called in template program mode using the template '
'"{:\'current_library_path()\'}".')
def evaluate(self, formatter, kwargs, mi, locals):
from calibre.library import current_library_path
return current_library_path()
[docs]class BuiltinVirtualLibraries(BuiltinFormatterFunction):
name = 'virtual_libraries'
arg_count = 0
category = 'Get values from metadata'
__doc__ = doc = _('virtual_libraries() -- return a comma-separated list of '
'Virtual libraries that contain this book. This function '
'works only in the GUI. If you want to use these values '
'in save-to-disk or send-to-device templates then you '
'must make a custom "Column built from other columns", use '
'the function in that column\'s template, and use that '
'column\'s value in your save/send templates')
def evaluate(self, formatter, kwargs, mi, locals_):
if hasattr(mi, '_proxy_metadata'):
return mi._proxy_metadata.virtual_libraries
return _('This function can be used only in the GUI')
[docs]class BuiltinUserCategories(BuiltinFormatterFunction):
name = 'user_categories'
arg_count = 0
category = 'Get values from metadata'
__doc__ = doc = _('user_categories() -- return a comma-separated list of '
'the user categories that contain this book. This function '
'works only in the GUI. If you want to use these values '
'in save-to-disk or send-to-device templates then you '
'must make a custom "Column built from other columns", use '
'the function in that column\'s template, and use that '
'column\'s value in your save/send templates')
def evaluate(self, formatter, kwargs, mi, locals_):
if hasattr(mi, '_proxy_metadata'):
cats = set(k for k, v in iteritems(mi._proxy_metadata.user_categories) if v)
cats = sorted(cats, key=sort_key)
return ', '.join(cats)
return _('This function can be used only in the GUI')
[docs]class BuiltinTransliterate(BuiltinFormatterFunction):
name = 'transliterate'
arg_count = 1
category = 'String manipulation'
__doc__ = doc = _('transliterate(a) -- Returns a string in a latin alphabet '
'formed by approximating the sound of the words in the '
'source string. For example, if the source is "{0}"'
' the function returns "{1}".').format(
u"Π€ΡΠ΄ΠΎΡ ΠΠΈΡ
Π°ΜΠΉΠ»ΠΎΠ²ΠΈΡ ΠΠΎΡΡΠΎΠ΅Π²ΡΠΊΠΈΠΉ", 'Fiodor Mikhailovich Dostoievskii')
def evaluate(self, formatter, kwargs, mi, locals, source):
from calibre.utils.filenames import ascii_text
return ascii_text(source)
[docs]class BuiltinAuthorLinks(BuiltinFormatterFunction):
name = 'author_links'
arg_count = 2
category = 'Get values from metadata'
__doc__ = doc = _('author_links(val_separator, pair_separator) -- returns '
'a string containing a list of authors and that author\'s '
'link values in the '
'form author1 val_separator author1link pair_separator '
'author2 val_separator author2link etc. An author is '
'separated from its link value by the val_separator string '
'with no added spaces. author:linkvalue pairs are separated '
'by the pair_separator string argument with no added spaces. '
'It is up to you to choose separator strings that do '
'not occur in author names or links. An author is '
'included even if the author link is empty.')
def evaluate(self, formatter, kwargs, mi, locals, val_sep, pair_sep):
if hasattr(mi, '_proxy_metadata'):
link_data = mi._proxy_metadata.author_link_map
if not link_data:
return ''
names = sorted(link_data.keys(), key=sort_key)
return pair_sep.join(n + val_sep + link_data[n] for n in names)
return _('This function can be used only in the GUI')
[docs]class BuiltinAuthorSorts(BuiltinFormatterFunction):
name = 'author_sorts'
arg_count = 1
category = 'Get values from metadata'
__doc__ = doc = _('author_sorts(val_separator) -- returns a string '
'containing a list of author\'s sort values for the '
'authors of the book. The sort is the one in the author '
'metadata (different from the author_sort in books). The '
'returned list has the form author sort 1 val_separator '
'author sort 2 etc. The author sort values in this list '
'are in the same order as the authors of the book. If '
'you want spaces around val_separator then include them '
'in the separator string')
def evaluate(self, formatter, kwargs, mi, locals, val_sep):
sort_data = mi.author_sort_map
if not sort_data:
return ''
names = [sort_data.get(n) for n in mi.authors if n.strip()]
return val_sep.join(n for n in names)
[docs]class BuiltinConnectedDeviceName(BuiltinFormatterFunction):
name = 'connected_device_name'
arg_count = 1
category = 'Get values from metadata'
__doc__ = doc = _("connected_device_name(storage_location) -- if a device is "
"connected then return the device name, otherwise return "
"the empty string. Each storage location on a device can "
"have a different name. The location names are 'main', "
"'carda' and 'cardb'. This function works only in the GUI.")
def evaluate(self, formatter, kwargs, mi, locals, storage_location):
if hasattr(mi, '_proxy_metadata'):
# Do the import here so that we don't entangle the GUI when using
# command line functions
from calibre.gui2.ui import get_gui
info = get_gui().device_manager.get_current_device_information()
if info is None:
return ''
try:
if storage_location not in {'main', 'carda', 'cardb'}:
raise ValueError(
_('connected_device_name: invalid storage location "{0}"'
.format(storage_location)))
info = info['info'][4]
if storage_location not in info:
return ''
return info[storage_location]['device_name']
except:
traceback.print_exc()
raise
return _('This function can be used only in the GUI')
[docs]class BuiltinCheckYesNo(BuiltinFormatterFunction):
name = 'check_yes_no'
arg_count = 4
category = 'If-then-else'
__doc__ = doc = _('check_yes_no(field_name, is_undefined, is_false, is_true) '
'-- checks the value of the yes/no field named by the '
'lookup key field_name for a value specified by the '
'parameters, returning "yes" if a match is found, otherwise '
'returning an empty string. Set the parameter is_undefined, '
'is_false, or is_true to 1 (the number) to check that '
'condition, otherwise set it to 0. Example: '
'check_yes_no("#bool", 1, 0, 1) returns "yes" if the '
'yes/no field "#bool" is either undefined (neither True '
'nor False) or True. More than one of is_undefined, '
'is_false, or is_true can be set to 1. This function '
'is usually used by the test() or is_empty() functions.')
def evaluate(self, formatter, kwargs, mi, locals, field, is_undefined, is_false, is_true):
res = getattr(mi, field, None)
if res is None:
if is_undefined == '1':
return 'yes'
return ""
if not isinstance(res, bool):
raise ValueError(_('check_yes_no requires the field be a Yes/No custom column'))
if is_false == '1' and not res:
return 'yes'
if is_true == '1' and res:
return 'yes'
return ""
[docs]class BuiltinRatingToStars(BuiltinFormatterFunction):
name = 'rating_to_stars'
arg_count = 2
category = 'Formatting values'
__doc__ = doc = _('rating_to_stars(value, use_half_stars) '
'-- Returns the rating as string of star characters. '
'The value is a number between 0 and 5. Set use_half_stars '
'to 1 if you want half star characters for custom ratings '
'columns that support non-integer ratings, for example 2.5.')
def evaluate(self, formatter, kwargs, mi, locals, value, use_half_stars):
if not value:
return ''
err_msg = _('The rating must be a number between 0 and 5')
try:
v = float(value) * 2
except:
raise ValueError(err_msg)
if v < 0 or v > 10:
raise ValueError(err_msg)
from calibre.ebooks.metadata import rating_to_stars
return rating_to_stars(v, use_half_stars == '1')
[docs]class BuiltinSwapAroundArticles(BuiltinFormatterFunction):
name = 'swap_around_articles'
arg_count = 2
category = 'String manipulation'
__doc__ = doc = _('swap_around_articles(val, separator) '
'-- returns the val with articles moved to the end. '
'The value can be a list, in which case each member '
'of the list is processed. If the value is a list then '
'you must provide the list value separator. If no '
'separator is provided then the value is treated as '
'being a single value, not a list.')
def evaluate(self, formatter, kwargs, mi, locals, val, separator):
if not val:
return ''
if not separator:
return title_sort(val).replace(',', ';')
result = []
try:
for v in [x.strip() for x in val.split(separator)]:
result.append(title_sort(v).replace(',', ';'))
except:
traceback.print_exc()
return separator.join(sorted(result, key=sort_key))
_formatter_builtins = [
BuiltinAdd(), BuiltinAnd(), BuiltinApproximateFormats(), BuiltinAssign(),
BuiltinAuthorLinks(), BuiltinAuthorSorts(), BuiltinBooksize(),
BuiltinCapitalize(), BuiltinCheckYesNo(), BuiltinCeiling(),
BuiltinCmp(), BuiltinConnectedDeviceName(), BuiltinContains(),
BuiltinCount(), BuiltinCurrentLibraryName(), BuiltinCurrentLibraryPath(),
BuiltinDaysBetween(), BuiltinDivide(), BuiltinEval(), BuiltinFirstNonEmpty(),
BuiltinField(), BuiltinFinishFormatting(), BuiltinFirstMatchingCmp(), BuiltinFloor(),
BuiltinFormatDate(), BuiltinFormatNumber(), BuiltinFormatsModtimes(),
BuiltinFormatsPaths(), BuiltinFormatsSizes(), BuiltinFractionalPart(),
BuiltinHasCover(), BuiltinHumanReadable(), BuiltinIdentifierInList(),
BuiltinIfempty(), BuiltinLanguageCodes(), BuiltinLanguageStrings(),
BuiltinInList(), BuiltinListDifference(), BuiltinListEquals(),
BuiltinListIntersection(), BuiltinListitem(), BuiltinListRe(),
BuiltinListReGroup(), BuiltinListSort(), BuiltinListUnion(), BuiltinLookup(),
BuiltinLowercase(), BuiltinMod(), BuiltinMultiply(), BuiltinNot(), BuiltinOndevice(),
BuiltinOr(), BuiltinPrint(), BuiltinRatingToStars(), BuiltinRawField(), BuiltinRawList(),
BuiltinRe(), BuiltinReGroup(), BuiltinRound(), BuiltinSelect(), BuiltinSeriesSort(),
BuiltinShorten(), BuiltinStrcat(), BuiltinStrcatMax(),
BuiltinStrcmp(), BuiltinStrInList(), BuiltinStrlen(), BuiltinSubitems(),
BuiltinSublist(),BuiltinSubstr(), BuiltinSubtract(), BuiltinSwapAroundArticles(),
BuiltinSwapAroundComma(), BuiltinSwitch(),
BuiltinTemplate(), BuiltinTest(), BuiltinTitlecase(),
BuiltinToday(), BuiltinTransliterate(), BuiltinUppercase(),
BuiltinUserCategories(), BuiltinVirtualLibraries(), BuiltinAnnotationCount()
]
class FormatterUserFunction(FormatterFunction):
def __init__(self, name, doc, arg_count, program_text, is_python):
self.is_python = is_python
self.name = name
self.doc = doc
self.arg_count = arg_count
self.program_text = program_text
self.cached_parse_tree = None
def to_pref(self):
return [self.name, self.doc, self.arg_count, self.program_text]
tabs = re.compile(r'^\t*')
def function_pref_is_python(pref):
if isinstance(pref, list):
pref = pref[3]
if pref.startswith('def'):
return True
if pref.startswith('program'):
return False
raise ValueError('Unknown program type in formatter function pref')
def function_pref_name(pref):
return pref[0]
def compile_user_function(name, doc, arg_count, eval_func):
if not function_pref_is_python(eval_func):
return FormatterUserFunction(name, doc, arg_count, eval_func, False)
def replace_func(mo):
return mo.group().replace('\t', ' ')
func = ' ' + '\n '.join([tabs.sub(replace_func, line)
for line in eval_func.splitlines()])
prog = '''
from calibre.utils.formatter_functions import FormatterUserFunction
from calibre.utils.formatter_functions import formatter_functions
class UserFunction(FormatterUserFunction):
''' + func
locals_ = {}
if DEBUG and tweaks.get('enable_template_debug_printing', False):
print(prog)
exec(prog, locals_)
cls = locals_['UserFunction'](name, doc, arg_count, eval_func, True)
return cls
def compile_user_template_functions(funcs):
compiled_funcs = {}
for func in funcs:
try:
# Force a name conflict to test the logic
# if func[0] == 'myFunc2':
# func[0] = 'myFunc3'
# Compile the function so that the tab processing is done on the
# source. This helps ensure that if the function already is defined
# then white space differences don't cause them to compare differently
cls = compile_user_function(*func)
cls.is_python = function_pref_is_python(func)
compiled_funcs[cls.name] = cls
except Exception:
try:
func_name = func[0]
except Exception:
func_name = 'Unknown'
prints('**** Compilation errors in user template function "%s" ****' % func_name)
traceback.print_exc(limit=10)
prints('**** End compilation errors in %s "****"' % func_name)
return compiled_funcs
def load_user_template_functions(library_uuid, funcs, precompiled_user_functions=None):
unload_user_template_functions(library_uuid)
if precompiled_user_functions:
compiled_funcs = precompiled_user_functions
else:
compiled_funcs = compile_user_template_functions(funcs)
formatter_functions().register_functions(library_uuid, list(compiled_funcs.values()))
def unload_user_template_functions(library_uuid):
formatter_functions().unregister_functions(library_uuid)
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