686 lines
26 KiB
Python
686 lines
26 KiB
Python
# mako/template.py
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# Copyright (C) 2006-2013 the Mako authors and contributors <see AUTHORS file>
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#
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# This module is part of Mako and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""Provides the Template class, a facade for parsing, generating and executing
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template strings, as well as template runtime operations."""
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from mako.lexer import Lexer
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from mako import runtime, util, exceptions, codegen, cache, compat
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import os
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import re
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import shutil
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import stat
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import sys
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import tempfile
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import types
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import weakref
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class Template(object):
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"""Represents a compiled template.
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:class:`.Template` includes a reference to the original
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template source (via the :attr:`.source` attribute)
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as well as the source code of the
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generated Python module (i.e. the :attr:`.code` attribute),
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as well as a reference to an actual Python module.
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:class:`.Template` is constructed using either a literal string
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representing the template text, or a filename representing a filesystem
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path to a source file.
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:param text: textual template source. This argument is mutually
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exclusive versus the ``filename`` parameter.
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:param filename: filename of the source template. This argument is
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mutually exclusive versus the ``text`` parameter.
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:param buffer_filters: string list of filters to be applied
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to the output of ``%def``\ s which are buffered, cached, or otherwise
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filtered, after all filters
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defined with the ``%def`` itself have been applied. Allows the
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creation of default expression filters that let the output
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of return-valued ``%def``\ s "opt out" of that filtering via
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passing special attributes or objects.
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:param bytestring_passthrough: When ``True``, and ``output_encoding`` is
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set to ``None``, and :meth:`.Template.render` is used to render,
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the `StringIO` or `cStringIO` buffer will be used instead of the
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default "fast" buffer. This allows raw bytestrings in the
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output stream, such as in expressions, to pass straight
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through to the buffer. This flag is forced
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to ``True`` if ``disable_unicode`` is also configured.
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.. versionadded:: 0.4
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Added to provide the same behavior as that of the previous series.
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:param cache_args: Dictionary of cache configuration arguments that
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will be passed to the :class:`.CacheImpl`. See :ref:`caching_toplevel`.
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:param cache_dir:
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.. deprecated:: 0.6
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Use the ``'dir'`` argument in the ``cache_args`` dictionary.
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See :ref:`caching_toplevel`.
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:param cache_enabled: Boolean flag which enables caching of this
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template. See :ref:`caching_toplevel`.
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:param cache_impl: String name of a :class:`.CacheImpl` caching
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implementation to use. Defaults to ``'beaker'``.
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:param cache_type:
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.. deprecated:: 0.6
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Use the ``'type'`` argument in the ``cache_args`` dictionary.
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See :ref:`caching_toplevel`.
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:param cache_url:
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.. deprecated:: 0.6
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Use the ``'url'`` argument in the ``cache_args`` dictionary.
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See :ref:`caching_toplevel`.
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:param default_filters: List of string filter names that will
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be applied to all expressions. See :ref:`filtering_default_filters`.
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:param disable_unicode: Disables all awareness of Python Unicode
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objects. See :ref:`unicode_disabled`.
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:param enable_loop: When ``True``, enable the ``loop`` context variable.
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This can be set to ``False`` to support templates that may
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be making usage of the name "``loop``". Individual templates can
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re-enable the "loop" context by placing the directive
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``enable_loop="True"`` inside the ``<%page>`` tag -- see
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:ref:`migrating_loop`.
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:param encoding_errors: Error parameter passed to ``encode()`` when
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string encoding is performed. See :ref:`usage_unicode`.
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:param error_handler: Python callable which is called whenever
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compile or runtime exceptions occur. The callable is passed
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the current context as well as the exception. If the
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callable returns ``True``, the exception is considered to
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be handled, else it is re-raised after the function
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completes. Is used to provide custom error-rendering
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functions.
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:param format_exceptions: if ``True``, exceptions which occur during
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the render phase of this template will be caught and
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formatted into an HTML error page, which then becomes the
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rendered result of the :meth:`.render` call. Otherwise,
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runtime exceptions are propagated outwards.
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:param imports: String list of Python statements, typically individual
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"import" lines, which will be placed into the module level
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preamble of all generated Python modules. See the example
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in :ref:`filtering_default_filters`.
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:param future_imports: String list of names to import from `__future__`.
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These will be concatenated into a comma-separated string and inserted
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into the beginning of the template, e.g. ``futures_imports=['FOO',
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'BAR']`` results in ``from __future__ import FOO, BAR``. If you're
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interested in using features like the new division operator, you must
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use future_imports to convey that to the renderer, as otherwise the
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import will not appear as the first executed statement in the generated
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code and will therefore not have the desired effect.
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:param input_encoding: Encoding of the template's source code. Can
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be used in lieu of the coding comment. See
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:ref:`usage_unicode` as well as :ref:`unicode_toplevel` for
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details on source encoding.
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:param lookup: a :class:`.TemplateLookup` instance that will be used
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for all file lookups via the ``<%namespace>``,
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``<%include>``, and ``<%inherit>`` tags. See
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:ref:`usage_templatelookup`.
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:param module_directory: Filesystem location where generated
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Python module files will be placed.
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:param module_filename: Overrides the filename of the generated
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Python module file. For advanced usage only.
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:param module_writer: A callable which overrides how the Python
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module is written entirely. The callable is passed the
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encoded source content of the module and the destination
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path to be written to. The default behavior of module writing
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uses a tempfile in conjunction with a file move in order
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to make the operation atomic. So a user-defined module
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writing function that mimics the default behavior would be:
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.. sourcecode:: python
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import tempfile
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import os
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import shutil
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def module_writer(source, outputpath):
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(dest, name) = \\
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tempfile.mkstemp(
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dir=os.path.dirname(outputpath)
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)
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os.write(dest, source)
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os.close(dest)
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shutil.move(name, outputpath)
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from mako.template import Template
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mytemplate = Template(
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filename="index.html",
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module_directory="/path/to/modules",
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module_writer=module_writer
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)
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The function is provided for unusual configurations where
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certain platform-specific permissions or other special
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steps are needed.
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:param output_encoding: The encoding to use when :meth:`.render`
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is called.
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See :ref:`usage_unicode` as well as :ref:`unicode_toplevel`.
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:param preprocessor: Python callable which will be passed
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the full template source before it is parsed. The return
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result of the callable will be used as the template source
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code.
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:param lexer_cls: A :class:`.Lexer` class used to parse
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the template. The :class:`.Lexer` class is used by
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default.
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.. versionadded:: 0.7.4
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:param strict_undefined: Replaces the automatic usage of
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``UNDEFINED`` for any undeclared variables not located in
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the :class:`.Context` with an immediate raise of
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``NameError``. The advantage is immediate reporting of
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missing variables which include the name.
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.. versionadded:: 0.3.6
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:param uri: string URI or other identifier for this template.
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If not provided, the ``uri`` is generated from the filesystem
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path, or from the in-memory identity of a non-file-based
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template. The primary usage of the ``uri`` is to provide a key
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within :class:`.TemplateLookup`, as well as to generate the
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file path of the generated Python module file, if
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``module_directory`` is specified.
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"""
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lexer_cls = Lexer
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def __init__(self,
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text=None,
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filename=None,
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uri=None,
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format_exceptions=False,
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error_handler=None,
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lookup=None,
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output_encoding=None,
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encoding_errors='strict',
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module_directory=None,
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cache_args=None,
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cache_impl='beaker',
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cache_enabled=True,
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cache_type=None,
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cache_dir=None,
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cache_url=None,
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module_filename=None,
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input_encoding=None,
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disable_unicode=False,
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module_writer=None,
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bytestring_passthrough=False,
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default_filters=None,
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buffer_filters=(),
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strict_undefined=False,
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imports=None,
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future_imports=None,
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enable_loop=True,
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preprocessor=None,
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lexer_cls=None):
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if uri:
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self.module_id = re.sub(r'\W', "_", uri)
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self.uri = uri
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elif filename:
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self.module_id = re.sub(r'\W', "_", filename)
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drive, path = os.path.splitdrive(filename)
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path = os.path.normpath(path).replace(os.path.sep, "/")
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self.uri = path
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else:
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self.module_id = "memory:" + hex(id(self))
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self.uri = self.module_id
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u_norm = self.uri
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if u_norm.startswith("/"):
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u_norm = u_norm[1:]
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u_norm = os.path.normpath(u_norm)
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if u_norm.startswith(".."):
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raise exceptions.TemplateLookupException(
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"Template uri \"%s\" is invalid - "
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"it cannot be relative outside "
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"of the root path." % self.uri)
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self.input_encoding = input_encoding
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self.output_encoding = output_encoding
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self.encoding_errors = encoding_errors
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self.disable_unicode = disable_unicode
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self.bytestring_passthrough = bytestring_passthrough or disable_unicode
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self.enable_loop = enable_loop
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self.strict_undefined = strict_undefined
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self.module_writer = module_writer
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if compat.py3k and disable_unicode:
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raise exceptions.UnsupportedError(
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"Mako for Python 3 does not "
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"support disabling Unicode")
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elif output_encoding and disable_unicode:
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raise exceptions.UnsupportedError(
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"output_encoding must be set to "
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"None when disable_unicode is used.")
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if default_filters is None:
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if compat.py3k or self.disable_unicode:
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self.default_filters = ['str']
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else:
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self.default_filters = ['unicode']
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else:
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self.default_filters = default_filters
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self.buffer_filters = buffer_filters
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self.imports = imports
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self.future_imports = future_imports
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self.preprocessor = preprocessor
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if lexer_cls is not None:
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self.lexer_cls = lexer_cls
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# if plain text, compile code in memory only
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if text is not None:
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(code, module) = _compile_text(self, text, filename)
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self._code = code
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self._source = text
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ModuleInfo(module, None, self, filename, code, text)
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elif filename is not None:
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# if template filename and a module directory, load
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# a filesystem-based module file, generating if needed
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if module_filename is not None:
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path = module_filename
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elif module_directory is not None:
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path = os.path.abspath(
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os.path.join(
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os.path.normpath(module_directory),
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u_norm + ".py"
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)
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)
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else:
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path = None
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module = self._compile_from_file(path, filename)
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else:
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raise exceptions.RuntimeException(
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"Template requires text or filename")
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self.module = module
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self.filename = filename
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self.callable_ = self.module.render_body
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self.format_exceptions = format_exceptions
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self.error_handler = error_handler
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self.lookup = lookup
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self.module_directory = module_directory
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self._setup_cache_args(
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cache_impl, cache_enabled, cache_args,
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cache_type, cache_dir, cache_url
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)
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@util.memoized_property
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def reserved_names(self):
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if self.enable_loop:
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return codegen.RESERVED_NAMES
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else:
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return codegen.RESERVED_NAMES.difference(['loop'])
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def _setup_cache_args(self,
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cache_impl, cache_enabled, cache_args,
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cache_type, cache_dir, cache_url):
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self.cache_impl = cache_impl
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self.cache_enabled = cache_enabled
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if cache_args:
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self.cache_args = cache_args
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else:
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self.cache_args = {}
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# transfer deprecated cache_* args
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if cache_type:
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self.cache_args['type'] = cache_type
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if cache_dir:
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self.cache_args['dir'] = cache_dir
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if cache_url:
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self.cache_args['url'] = cache_url
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def _compile_from_file(self, path, filename):
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if path is not None:
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util.verify_directory(os.path.dirname(path))
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filemtime = os.stat(filename)[stat.ST_MTIME]
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if not os.path.exists(path) or \
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os.stat(path)[stat.ST_MTIME] < filemtime:
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data = util.read_file(filename)
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_compile_module_file(
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self,
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data,
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filename,
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path,
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self.module_writer)
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module = compat.load_module(self.module_id, path)
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del sys.modules[self.module_id]
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if module._magic_number != codegen.MAGIC_NUMBER:
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data = util.read_file(filename)
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_compile_module_file(
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self,
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data,
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filename,
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path,
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self.module_writer)
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module = compat.load_module(self.module_id, path)
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del sys.modules[self.module_id]
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ModuleInfo(module, path, self, filename, None, None)
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else:
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# template filename and no module directory, compile code
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# in memory
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data = util.read_file(filename)
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code, module = _compile_text(
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self,
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data,
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filename)
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self._source = None
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self._code = code
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ModuleInfo(module, None, self, filename, code, None)
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return module
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@property
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def source(self):
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"""Return the template source code for this :class:`.Template`."""
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return _get_module_info_from_callable(self.callable_).source
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@property
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def code(self):
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"""Return the module source code for this :class:`.Template`."""
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return _get_module_info_from_callable(self.callable_).code
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@util.memoized_property
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def cache(self):
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return cache.Cache(self)
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@property
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def cache_dir(self):
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return self.cache_args['dir']
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@property
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def cache_url(self):
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return self.cache_args['url']
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@property
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def cache_type(self):
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return self.cache_args['type']
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def render(self, *args, **data):
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"""Render the output of this template as a string.
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If the template specifies an output encoding, the string
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will be encoded accordingly, else the output is raw (raw
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output uses `cStringIO` and can't handle multibyte
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characters). A :class:`.Context` object is created corresponding
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to the given data. Arguments that are explicitly declared
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by this template's internal rendering method are also
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pulled from the given ``*args``, ``**data`` members.
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"""
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return runtime._render(self, self.callable_, args, data)
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def render_unicode(self, *args, **data):
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"""Render the output of this template as a unicode object."""
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return runtime._render(self,
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self.callable_,
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args,
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data,
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as_unicode=True)
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def render_context(self, context, *args, **kwargs):
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"""Render this :class:`.Template` with the given context.
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The data is written to the context's buffer.
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"""
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if getattr(context, '_with_template', None) is None:
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context._set_with_template(self)
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runtime._render_context(self,
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self.callable_,
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context,
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*args,
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**kwargs)
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def has_def(self, name):
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return hasattr(self.module, "render_%s" % name)
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def get_def(self, name):
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"""Return a def of this template as a :class:`.DefTemplate`."""
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return DefTemplate(self, getattr(self.module, "render_%s" % name))
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def _get_def_callable(self, name):
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return getattr(self.module, "render_%s" % name)
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@property
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def last_modified(self):
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return self.module._modified_time
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class ModuleTemplate(Template):
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"""A Template which is constructed given an existing Python module.
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e.g.::
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t = Template("this is a template")
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f = file("mymodule.py", "w")
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f.write(t.code)
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f.close()
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import mymodule
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t = ModuleTemplate(mymodule)
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print t.render()
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"""
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def __init__(self, module,
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module_filename=None,
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template=None,
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template_filename=None,
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module_source=None,
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template_source=None,
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output_encoding=None,
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encoding_errors='strict',
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disable_unicode=False,
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bytestring_passthrough=False,
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format_exceptions=False,
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error_handler=None,
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lookup=None,
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cache_args=None,
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cache_impl='beaker',
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cache_enabled=True,
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cache_type=None,
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cache_dir=None,
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cache_url=None,
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):
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self.module_id = re.sub(r'\W', "_", module._template_uri)
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self.uri = module._template_uri
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self.input_encoding = module._source_encoding
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self.output_encoding = output_encoding
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self.encoding_errors = encoding_errors
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self.disable_unicode = disable_unicode
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self.bytestring_passthrough = bytestring_passthrough or disable_unicode
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self.enable_loop = module._enable_loop
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if compat.py3k and disable_unicode:
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raise exceptions.UnsupportedError(
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"Mako for Python 3 does not "
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"support disabling Unicode")
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elif output_encoding and disable_unicode:
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raise exceptions.UnsupportedError(
|
|
"output_encoding must be set to "
|
|
"None when disable_unicode is used.")
|
|
|
|
self.module = module
|
|
self.filename = template_filename
|
|
ModuleInfo(module,
|
|
module_filename,
|
|
self,
|
|
template_filename,
|
|
module_source,
|
|
template_source)
|
|
|
|
self.callable_ = self.module.render_body
|
|
self.format_exceptions = format_exceptions
|
|
self.error_handler = error_handler
|
|
self.lookup = lookup
|
|
self._setup_cache_args(
|
|
cache_impl, cache_enabled, cache_args,
|
|
cache_type, cache_dir, cache_url
|
|
)
|
|
|
|
class DefTemplate(Template):
|
|
"""A :class:`.Template` which represents a callable def in a parent
|
|
template."""
|
|
|
|
def __init__(self, parent, callable_):
|
|
self.parent = parent
|
|
self.callable_ = callable_
|
|
self.output_encoding = parent.output_encoding
|
|
self.module = parent.module
|
|
self.encoding_errors = parent.encoding_errors
|
|
self.format_exceptions = parent.format_exceptions
|
|
self.error_handler = parent.error_handler
|
|
self.enable_loop = parent.enable_loop
|
|
self.lookup = parent.lookup
|
|
self.bytestring_passthrough = parent.bytestring_passthrough
|
|
|
|
def get_def(self, name):
|
|
return self.parent.get_def(name)
|
|
|
|
class ModuleInfo(object):
|
|
"""Stores information about a module currently loaded into
|
|
memory, provides reverse lookups of template source, module
|
|
source code based on a module's identifier.
|
|
|
|
"""
|
|
_modules = weakref.WeakValueDictionary()
|
|
|
|
def __init__(self,
|
|
module,
|
|
module_filename,
|
|
template,
|
|
template_filename,
|
|
module_source,
|
|
template_source):
|
|
self.module = module
|
|
self.module_filename = module_filename
|
|
self.template_filename = template_filename
|
|
self.module_source = module_source
|
|
self.template_source = template_source
|
|
self._modules[module.__name__] = template._mmarker = self
|
|
if module_filename:
|
|
self._modules[module_filename] = self
|
|
|
|
@property
|
|
def code(self):
|
|
if self.module_source is not None:
|
|
return self.module_source
|
|
else:
|
|
return util.read_python_file(self.module_filename)
|
|
|
|
@property
|
|
def source(self):
|
|
if self.template_source is not None:
|
|
if self.module._source_encoding and \
|
|
not isinstance(self.template_source, compat.text_type):
|
|
return self.template_source.decode(
|
|
self.module._source_encoding)
|
|
else:
|
|
return self.template_source
|
|
else:
|
|
data = util.read_file(self.template_filename)
|
|
if self.module._source_encoding:
|
|
return data.decode(self.module._source_encoding)
|
|
else:
|
|
return data
|
|
|
|
def _compile(template, text, filename, generate_magic_comment):
|
|
lexer = template.lexer_cls(text,
|
|
filename,
|
|
disable_unicode=template.disable_unicode,
|
|
input_encoding=template.input_encoding,
|
|
preprocessor=template.preprocessor)
|
|
node = lexer.parse()
|
|
source = codegen.compile(node,
|
|
template.uri,
|
|
filename,
|
|
default_filters=template.default_filters,
|
|
buffer_filters=template.buffer_filters,
|
|
imports=template.imports,
|
|
future_imports=template.future_imports,
|
|
source_encoding=lexer.encoding,
|
|
generate_magic_comment=generate_magic_comment,
|
|
disable_unicode=template.disable_unicode,
|
|
strict_undefined=template.strict_undefined,
|
|
enable_loop=template.enable_loop,
|
|
reserved_names=template.reserved_names)
|
|
return source, lexer
|
|
|
|
def _compile_text(template, text, filename):
|
|
identifier = template.module_id
|
|
source, lexer = _compile(template, text, filename,
|
|
generate_magic_comment=template.disable_unicode)
|
|
|
|
cid = identifier
|
|
if not compat.py3k and isinstance(cid, compat.text_type):
|
|
cid = cid.encode()
|
|
module = types.ModuleType(cid)
|
|
code = compile(source, cid, 'exec')
|
|
|
|
# this exec() works for 2.4->3.3.
|
|
exec(code, module.__dict__, module.__dict__)
|
|
return (source, module)
|
|
|
|
def _compile_module_file(template, text, filename, outputpath, module_writer):
|
|
source, lexer = _compile(template, text, filename,
|
|
generate_magic_comment=True)
|
|
|
|
if isinstance(source, compat.text_type):
|
|
source = source.encode(lexer.encoding or 'ascii')
|
|
|
|
if module_writer:
|
|
module_writer(source, outputpath)
|
|
else:
|
|
# make tempfiles in the same location as the ultimate
|
|
# location. this ensures they're on the same filesystem,
|
|
# avoiding synchronization issues.
|
|
(dest, name) = tempfile.mkstemp(dir=os.path.dirname(outputpath))
|
|
|
|
os.write(dest, source)
|
|
os.close(dest)
|
|
shutil.move(name, outputpath)
|
|
|
|
def _get_module_info_from_callable(callable_):
|
|
if compat.py3k:
|
|
return _get_module_info(callable_.__globals__['__name__'])
|
|
else:
|
|
return _get_module_info(callable_.func_globals['__name__'])
|
|
|
|
def _get_module_info(filename):
|
|
return ModuleInfo._modules[filename]
|
|
|