mirror of
https://github.com/janeczku/calibre-web
synced 2024-12-26 10:00:37 +00:00
637 lines
24 KiB
Python
637 lines
24 KiB
Python
# -*- coding: utf-8 -*-
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"""
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jinja2.ext
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~~~~~~~~~~
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Jinja extensions allow to add custom tags similar to the way django custom
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tags work. By default two example extensions exist: an i18n and a cache
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extension.
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:copyright: (c) 2010 by the Jinja Team.
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:license: BSD.
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"""
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from jinja2 import nodes
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from jinja2.defaults import BLOCK_START_STRING, \
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BLOCK_END_STRING, VARIABLE_START_STRING, VARIABLE_END_STRING, \
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COMMENT_START_STRING, COMMENT_END_STRING, LINE_STATEMENT_PREFIX, \
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LINE_COMMENT_PREFIX, TRIM_BLOCKS, NEWLINE_SEQUENCE, \
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KEEP_TRAILING_NEWLINE, LSTRIP_BLOCKS
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from jinja2.environment import Environment
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from jinja2.runtime import concat
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from jinja2.exceptions import TemplateAssertionError, TemplateSyntaxError
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from jinja2.utils import contextfunction, import_string, Markup
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from jinja2._compat import next, with_metaclass, string_types, iteritems
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# the only real useful gettext functions for a Jinja template. Note
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# that ugettext must be assigned to gettext as Jinja doesn't support
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# non unicode strings.
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GETTEXT_FUNCTIONS = ('_', 'gettext', 'ngettext')
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class ExtensionRegistry(type):
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"""Gives the extension an unique identifier."""
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def __new__(cls, name, bases, d):
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rv = type.__new__(cls, name, bases, d)
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rv.identifier = rv.__module__ + '.' + rv.__name__
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return rv
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class Extension(with_metaclass(ExtensionRegistry, object)):
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"""Extensions can be used to add extra functionality to the Jinja template
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system at the parser level. Custom extensions are bound to an environment
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but may not store environment specific data on `self`. The reason for
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this is that an extension can be bound to another environment (for
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overlays) by creating a copy and reassigning the `environment` attribute.
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As extensions are created by the environment they cannot accept any
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arguments for configuration. One may want to work around that by using
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a factory function, but that is not possible as extensions are identified
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by their import name. The correct way to configure the extension is
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storing the configuration values on the environment. Because this way the
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environment ends up acting as central configuration storage the
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attributes may clash which is why extensions have to ensure that the names
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they choose for configuration are not too generic. ``prefix`` for example
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is a terrible name, ``fragment_cache_prefix`` on the other hand is a good
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name as includes the name of the extension (fragment cache).
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"""
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#: if this extension parses this is the list of tags it's listening to.
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tags = set()
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#: the priority of that extension. This is especially useful for
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#: extensions that preprocess values. A lower value means higher
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#: priority.
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#:
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#: .. versionadded:: 2.4
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priority = 100
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def __init__(self, environment):
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self.environment = environment
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def bind(self, environment):
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"""Create a copy of this extension bound to another environment."""
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rv = object.__new__(self.__class__)
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rv.__dict__.update(self.__dict__)
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rv.environment = environment
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return rv
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def preprocess(self, source, name, filename=None):
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"""This method is called before the actual lexing and can be used to
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preprocess the source. The `filename` is optional. The return value
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must be the preprocessed source.
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"""
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return source
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def filter_stream(self, stream):
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"""It's passed a :class:`~jinja2.lexer.TokenStream` that can be used
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to filter tokens returned. This method has to return an iterable of
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:class:`~jinja2.lexer.Token`\s, but it doesn't have to return a
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:class:`~jinja2.lexer.TokenStream`.
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In the `ext` folder of the Jinja2 source distribution there is a file
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called `inlinegettext.py` which implements a filter that utilizes this
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method.
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"""
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return stream
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def parse(self, parser):
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"""If any of the :attr:`tags` matched this method is called with the
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parser as first argument. The token the parser stream is pointing at
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is the name token that matched. This method has to return one or a
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list of multiple nodes.
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"""
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raise NotImplementedError()
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def attr(self, name, lineno=None):
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"""Return an attribute node for the current extension. This is useful
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to pass constants on extensions to generated template code.
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::
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self.attr('_my_attribute', lineno=lineno)
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"""
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return nodes.ExtensionAttribute(self.identifier, name, lineno=lineno)
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def call_method(self, name, args=None, kwargs=None, dyn_args=None,
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dyn_kwargs=None, lineno=None):
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"""Call a method of the extension. This is a shortcut for
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:meth:`attr` + :class:`jinja2.nodes.Call`.
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"""
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if args is None:
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args = []
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if kwargs is None:
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kwargs = []
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return nodes.Call(self.attr(name, lineno=lineno), args, kwargs,
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dyn_args, dyn_kwargs, lineno=lineno)
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@contextfunction
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def _gettext_alias(__context, *args, **kwargs):
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return __context.call(__context.resolve('gettext'), *args, **kwargs)
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def _make_new_gettext(func):
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@contextfunction
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def gettext(__context, __string, **variables):
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rv = __context.call(func, __string)
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if __context.eval_ctx.autoescape:
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rv = Markup(rv)
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return rv % variables
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return gettext
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def _make_new_ngettext(func):
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@contextfunction
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def ngettext(__context, __singular, __plural, __num, **variables):
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variables.setdefault('num', __num)
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rv = __context.call(func, __singular, __plural, __num)
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if __context.eval_ctx.autoescape:
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rv = Markup(rv)
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return rv % variables
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return ngettext
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class InternationalizationExtension(Extension):
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"""This extension adds gettext support to Jinja2."""
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tags = set(['trans'])
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# TODO: the i18n extension is currently reevaluating values in a few
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# situations. Take this example:
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# {% trans count=something() %}{{ count }} foo{% pluralize
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# %}{{ count }} fooss{% endtrans %}
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# something is called twice here. One time for the gettext value and
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# the other time for the n-parameter of the ngettext function.
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def __init__(self, environment):
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Extension.__init__(self, environment)
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environment.globals['_'] = _gettext_alias
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environment.extend(
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install_gettext_translations=self._install,
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install_null_translations=self._install_null,
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install_gettext_callables=self._install_callables,
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uninstall_gettext_translations=self._uninstall,
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extract_translations=self._extract,
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newstyle_gettext=False
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)
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def _install(self, translations, newstyle=None):
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gettext = getattr(translations, 'ugettext', None)
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if gettext is None:
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gettext = translations.gettext
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ngettext = getattr(translations, 'ungettext', None)
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if ngettext is None:
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ngettext = translations.ngettext
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self._install_callables(gettext, ngettext, newstyle)
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def _install_null(self, newstyle=None):
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self._install_callables(
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lambda x: x,
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lambda s, p, n: (n != 1 and (p,) or (s,))[0],
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newstyle
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)
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def _install_callables(self, gettext, ngettext, newstyle=None):
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if newstyle is not None:
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self.environment.newstyle_gettext = newstyle
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if self.environment.newstyle_gettext:
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gettext = _make_new_gettext(gettext)
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ngettext = _make_new_ngettext(ngettext)
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self.environment.globals.update(
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gettext=gettext,
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ngettext=ngettext
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)
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def _uninstall(self, translations):
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for key in 'gettext', 'ngettext':
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self.environment.globals.pop(key, None)
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def _extract(self, source, gettext_functions=GETTEXT_FUNCTIONS):
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if isinstance(source, string_types):
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source = self.environment.parse(source)
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return extract_from_ast(source, gettext_functions)
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def parse(self, parser):
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"""Parse a translatable tag."""
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lineno = next(parser.stream).lineno
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num_called_num = False
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# find all the variables referenced. Additionally a variable can be
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# defined in the body of the trans block too, but this is checked at
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# a later state.
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plural_expr = None
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plural_expr_assignment = None
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variables = {}
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while parser.stream.current.type != 'block_end':
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if variables:
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parser.stream.expect('comma')
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# skip colon for python compatibility
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if parser.stream.skip_if('colon'):
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break
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name = parser.stream.expect('name')
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if name.value in variables:
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parser.fail('translatable variable %r defined twice.' %
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name.value, name.lineno,
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exc=TemplateAssertionError)
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# expressions
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if parser.stream.current.type == 'assign':
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next(parser.stream)
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variables[name.value] = var = parser.parse_expression()
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else:
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variables[name.value] = var = nodes.Name(name.value, 'load')
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if plural_expr is None:
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if isinstance(var, nodes.Call):
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plural_expr = nodes.Name('_trans', 'load')
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variables[name.value] = plural_expr
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plural_expr_assignment = nodes.Assign(
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nodes.Name('_trans', 'store'), var)
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else:
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plural_expr = var
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num_called_num = name.value == 'num'
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parser.stream.expect('block_end')
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plural = plural_names = None
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have_plural = False
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referenced = set()
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# now parse until endtrans or pluralize
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singular_names, singular = self._parse_block(parser, True)
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if singular_names:
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referenced.update(singular_names)
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if plural_expr is None:
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plural_expr = nodes.Name(singular_names[0], 'load')
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num_called_num = singular_names[0] == 'num'
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# if we have a pluralize block, we parse that too
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if parser.stream.current.test('name:pluralize'):
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have_plural = True
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next(parser.stream)
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if parser.stream.current.type != 'block_end':
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name = parser.stream.expect('name')
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if name.value not in variables:
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parser.fail('unknown variable %r for pluralization' %
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name.value, name.lineno,
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exc=TemplateAssertionError)
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plural_expr = variables[name.value]
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num_called_num = name.value == 'num'
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parser.stream.expect('block_end')
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plural_names, plural = self._parse_block(parser, False)
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next(parser.stream)
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referenced.update(plural_names)
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else:
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next(parser.stream)
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# register free names as simple name expressions
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for var in referenced:
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if var not in variables:
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variables[var] = nodes.Name(var, 'load')
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if not have_plural:
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plural_expr = None
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elif plural_expr is None:
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parser.fail('pluralize without variables', lineno)
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node = self._make_node(singular, plural, variables, plural_expr,
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bool(referenced),
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num_called_num and have_plural)
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node.set_lineno(lineno)
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if plural_expr_assignment is not None:
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return [plural_expr_assignment, node]
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else:
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return node
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def _parse_block(self, parser, allow_pluralize):
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"""Parse until the next block tag with a given name."""
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referenced = []
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buf = []
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while 1:
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if parser.stream.current.type == 'data':
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buf.append(parser.stream.current.value.replace('%', '%%'))
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next(parser.stream)
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elif parser.stream.current.type == 'variable_begin':
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next(parser.stream)
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name = parser.stream.expect('name').value
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referenced.append(name)
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buf.append('%%(%s)s' % name)
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parser.stream.expect('variable_end')
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elif parser.stream.current.type == 'block_begin':
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next(parser.stream)
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if parser.stream.current.test('name:endtrans'):
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break
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elif parser.stream.current.test('name:pluralize'):
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if allow_pluralize:
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break
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parser.fail('a translatable section can have only one '
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'pluralize section')
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parser.fail('control structures in translatable sections are '
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'not allowed')
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elif parser.stream.eos:
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parser.fail('unclosed translation block')
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else:
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assert False, 'internal parser error'
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return referenced, concat(buf)
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def _make_node(self, singular, plural, variables, plural_expr,
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vars_referenced, num_called_num):
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"""Generates a useful node from the data provided."""
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# no variables referenced? no need to escape for old style
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# gettext invocations only if there are vars.
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if not vars_referenced and not self.environment.newstyle_gettext:
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singular = singular.replace('%%', '%')
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if plural:
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plural = plural.replace('%%', '%')
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# singular only:
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if plural_expr is None:
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gettext = nodes.Name('gettext', 'load')
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node = nodes.Call(gettext, [nodes.Const(singular)],
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[], None, None)
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# singular and plural
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else:
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ngettext = nodes.Name('ngettext', 'load')
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node = nodes.Call(ngettext, [
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nodes.Const(singular),
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nodes.Const(plural),
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plural_expr
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], [], None, None)
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# in case newstyle gettext is used, the method is powerful
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# enough to handle the variable expansion and autoescape
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# handling itself
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if self.environment.newstyle_gettext:
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for key, value in iteritems(variables):
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# the function adds that later anyways in case num was
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# called num, so just skip it.
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if num_called_num and key == 'num':
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continue
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node.kwargs.append(nodes.Keyword(key, value))
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# otherwise do that here
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else:
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# mark the return value as safe if we are in an
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# environment with autoescaping turned on
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node = nodes.MarkSafeIfAutoescape(node)
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if variables:
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node = nodes.Mod(node, nodes.Dict([
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nodes.Pair(nodes.Const(key), value)
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for key, value in variables.items()
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]))
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return nodes.Output([node])
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class ExprStmtExtension(Extension):
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"""Adds a `do` tag to Jinja2 that works like the print statement just
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that it doesn't print the return value.
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"""
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tags = set(['do'])
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def parse(self, parser):
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node = nodes.ExprStmt(lineno=next(parser.stream).lineno)
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node.node = parser.parse_tuple()
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return node
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class LoopControlExtension(Extension):
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"""Adds break and continue to the template engine."""
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tags = set(['break', 'continue'])
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def parse(self, parser):
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token = next(parser.stream)
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if token.value == 'break':
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return nodes.Break(lineno=token.lineno)
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return nodes.Continue(lineno=token.lineno)
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class WithExtension(Extension):
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"""Adds support for a django-like with block."""
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tags = set(['with'])
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def parse(self, parser):
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node = nodes.Scope(lineno=next(parser.stream).lineno)
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assignments = []
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while parser.stream.current.type != 'block_end':
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lineno = parser.stream.current.lineno
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if assignments:
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parser.stream.expect('comma')
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target = parser.parse_assign_target()
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parser.stream.expect('assign')
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expr = parser.parse_expression()
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assignments.append(nodes.Assign(target, expr, lineno=lineno))
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node.body = assignments + \
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list(parser.parse_statements(('name:endwith',),
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drop_needle=True))
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return node
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class AutoEscapeExtension(Extension):
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"""Changes auto escape rules for a scope."""
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tags = set(['autoescape'])
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def parse(self, parser):
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node = nodes.ScopedEvalContextModifier(lineno=next(parser.stream).lineno)
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node.options = [
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nodes.Keyword('autoescape', parser.parse_expression())
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]
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node.body = parser.parse_statements(('name:endautoescape',),
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drop_needle=True)
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return nodes.Scope([node])
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def extract_from_ast(node, gettext_functions=GETTEXT_FUNCTIONS,
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babel_style=True):
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"""Extract localizable strings from the given template node. Per
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default this function returns matches in babel style that means non string
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parameters as well as keyword arguments are returned as `None`. This
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allows Babel to figure out what you really meant if you are using
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gettext functions that allow keyword arguments for placeholder expansion.
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If you don't want that behavior set the `babel_style` parameter to `False`
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which causes only strings to be returned and parameters are always stored
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in tuples. As a consequence invalid gettext calls (calls without a single
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string parameter or string parameters after non-string parameters) are
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skipped.
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This example explains the behavior:
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>>> from jinja2 import Environment
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>>> env = Environment()
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>>> node = env.parse('{{ (_("foo"), _(), ngettext("foo", "bar", 42)) }}')
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>>> list(extract_from_ast(node))
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[(1, '_', 'foo'), (1, '_', ()), (1, 'ngettext', ('foo', 'bar', None))]
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>>> list(extract_from_ast(node, babel_style=False))
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[(1, '_', ('foo',)), (1, 'ngettext', ('foo', 'bar'))]
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For every string found this function yields a ``(lineno, function,
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message)`` tuple, where:
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* ``lineno`` is the number of the line on which the string was found,
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* ``function`` is the name of the ``gettext`` function used (if the
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string was extracted from embedded Python code), and
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* ``message`` is the string itself (a ``unicode`` object, or a tuple
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of ``unicode`` objects for functions with multiple string arguments).
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This extraction function operates on the AST and is because of that unable
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to extract any comments. For comment support you have to use the babel
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extraction interface or extract comments yourself.
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"""
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for node in node.find_all(nodes.Call):
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if not isinstance(node.node, nodes.Name) or \
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node.node.name not in gettext_functions:
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continue
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strings = []
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for arg in node.args:
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if isinstance(arg, nodes.Const) and \
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isinstance(arg.value, string_types):
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strings.append(arg.value)
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else:
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strings.append(None)
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for arg in node.kwargs:
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strings.append(None)
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if node.dyn_args is not None:
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strings.append(None)
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if node.dyn_kwargs is not None:
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strings.append(None)
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if not babel_style:
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|
strings = tuple(x for x in strings if x is not None)
|
|
if not strings:
|
|
continue
|
|
else:
|
|
if len(strings) == 1:
|
|
strings = strings[0]
|
|
else:
|
|
strings = tuple(strings)
|
|
yield node.lineno, node.node.name, strings
|
|
|
|
|
|
class _CommentFinder(object):
|
|
"""Helper class to find comments in a token stream. Can only
|
|
find comments for gettext calls forwards. Once the comment
|
|
from line 4 is found, a comment for line 1 will not return a
|
|
usable value.
|
|
"""
|
|
|
|
def __init__(self, tokens, comment_tags):
|
|
self.tokens = tokens
|
|
self.comment_tags = comment_tags
|
|
self.offset = 0
|
|
self.last_lineno = 0
|
|
|
|
def find_backwards(self, offset):
|
|
try:
|
|
for _, token_type, token_value in \
|
|
reversed(self.tokens[self.offset:offset]):
|
|
if token_type in ('comment', 'linecomment'):
|
|
try:
|
|
prefix, comment = token_value.split(None, 1)
|
|
except ValueError:
|
|
continue
|
|
if prefix in self.comment_tags:
|
|
return [comment.rstrip()]
|
|
return []
|
|
finally:
|
|
self.offset = offset
|
|
|
|
def find_comments(self, lineno):
|
|
if not self.comment_tags or self.last_lineno > lineno:
|
|
return []
|
|
for idx, (token_lineno, _, _) in enumerate(self.tokens[self.offset:]):
|
|
if token_lineno > lineno:
|
|
return self.find_backwards(self.offset + idx)
|
|
return self.find_backwards(len(self.tokens))
|
|
|
|
|
|
def babel_extract(fileobj, keywords, comment_tags, options):
|
|
"""Babel extraction method for Jinja templates.
|
|
|
|
.. versionchanged:: 2.3
|
|
Basic support for translation comments was added. If `comment_tags`
|
|
is now set to a list of keywords for extraction, the extractor will
|
|
try to find the best preceeding comment that begins with one of the
|
|
keywords. For best results, make sure to not have more than one
|
|
gettext call in one line of code and the matching comment in the
|
|
same line or the line before.
|
|
|
|
.. versionchanged:: 2.5.1
|
|
The `newstyle_gettext` flag can be set to `True` to enable newstyle
|
|
gettext calls.
|
|
|
|
.. versionchanged:: 2.7
|
|
A `silent` option can now be provided. If set to `False` template
|
|
syntax errors are propagated instead of being ignored.
|
|
|
|
:param fileobj: the file-like object the messages should be extracted from
|
|
:param keywords: a list of keywords (i.e. function names) that should be
|
|
recognized as translation functions
|
|
:param comment_tags: a list of translator tags to search for and include
|
|
in the results.
|
|
:param options: a dictionary of additional options (optional)
|
|
:return: an iterator over ``(lineno, funcname, message, comments)`` tuples.
|
|
(comments will be empty currently)
|
|
"""
|
|
extensions = set()
|
|
for extension in options.get('extensions', '').split(','):
|
|
extension = extension.strip()
|
|
if not extension:
|
|
continue
|
|
extensions.add(import_string(extension))
|
|
if InternationalizationExtension not in extensions:
|
|
extensions.add(InternationalizationExtension)
|
|
|
|
def getbool(options, key, default=False):
|
|
return options.get(key, str(default)).lower() in \
|
|
('1', 'on', 'yes', 'true')
|
|
|
|
silent = getbool(options, 'silent', True)
|
|
environment = Environment(
|
|
options.get('block_start_string', BLOCK_START_STRING),
|
|
options.get('block_end_string', BLOCK_END_STRING),
|
|
options.get('variable_start_string', VARIABLE_START_STRING),
|
|
options.get('variable_end_string', VARIABLE_END_STRING),
|
|
options.get('comment_start_string', COMMENT_START_STRING),
|
|
options.get('comment_end_string', COMMENT_END_STRING),
|
|
options.get('line_statement_prefix') or LINE_STATEMENT_PREFIX,
|
|
options.get('line_comment_prefix') or LINE_COMMENT_PREFIX,
|
|
getbool(options, 'trim_blocks', TRIM_BLOCKS),
|
|
getbool(options, 'lstrip_blocks', LSTRIP_BLOCKS),
|
|
NEWLINE_SEQUENCE,
|
|
getbool(options, 'keep_trailing_newline', KEEP_TRAILING_NEWLINE),
|
|
frozenset(extensions),
|
|
cache_size=0,
|
|
auto_reload=False
|
|
)
|
|
|
|
if getbool(options, 'newstyle_gettext'):
|
|
environment.newstyle_gettext = True
|
|
|
|
source = fileobj.read().decode(options.get('encoding', 'utf-8'))
|
|
try:
|
|
node = environment.parse(source)
|
|
tokens = list(environment.lex(environment.preprocess(source)))
|
|
except TemplateSyntaxError as e:
|
|
if not silent:
|
|
raise
|
|
# skip templates with syntax errors
|
|
return
|
|
|
|
finder = _CommentFinder(tokens, comment_tags)
|
|
for lineno, func, message in extract_from_ast(node, keywords):
|
|
yield lineno, func, message, finder.find_comments(lineno)
|
|
|
|
|
|
#: nicer import names
|
|
i18n = InternationalizationExtension
|
|
do = ExprStmtExtension
|
|
loopcontrols = LoopControlExtension
|
|
with_ = WithExtension
|
|
autoescape = AutoEscapeExtension
|