1192 lines
46 KiB
Python
1192 lines
46 KiB
Python
# -*- coding: utf-8 -*-
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"""
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jinja2.environment
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~~~~~~~~~~~~~~~~~~
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Provides a class that holds runtime and parsing time options.
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:copyright: (c) 2010 by the Jinja Team.
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:license: BSD, see LICENSE for more details.
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"""
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import os
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import sys
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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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DEFAULT_FILTERS, DEFAULT_TESTS, DEFAULT_NAMESPACE, \
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KEEP_TRAILING_NEWLINE, LSTRIP_BLOCKS
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from jinja2.lexer import get_lexer, TokenStream
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from jinja2.parser import Parser
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from jinja2.nodes import EvalContext
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from jinja2.optimizer import optimize
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from jinja2.compiler import generate
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from jinja2.runtime import Undefined, new_context
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from jinja2.exceptions import TemplateSyntaxError, TemplateNotFound, \
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TemplatesNotFound, TemplateRuntimeError
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from jinja2.utils import import_string, LRUCache, Markup, missing, \
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concat, consume, internalcode
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from jinja2._compat import imap, ifilter, string_types, iteritems, \
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text_type, reraise, implements_iterator, implements_to_string, \
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get_next, encode_filename, PY2, PYPY
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from functools import reduce
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# for direct template usage we have up to ten living environments
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_spontaneous_environments = LRUCache(10)
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# the function to create jinja traceback objects. This is dynamically
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# imported on the first exception in the exception handler.
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_make_traceback = None
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def get_spontaneous_environment(*args):
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"""Return a new spontaneous environment. A spontaneous environment is an
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unnamed and unaccessible (in theory) environment that is used for
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templates generated from a string and not from the file system.
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"""
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try:
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env = _spontaneous_environments.get(args)
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except TypeError:
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return Environment(*args)
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if env is not None:
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return env
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_spontaneous_environments[args] = env = Environment(*args)
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env.shared = True
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return env
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def create_cache(size):
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"""Return the cache class for the given size."""
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if size == 0:
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return None
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if size < 0:
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return {}
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return LRUCache(size)
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def copy_cache(cache):
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"""Create an empty copy of the given cache."""
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if cache is None:
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return None
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elif type(cache) is dict:
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return {}
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return LRUCache(cache.capacity)
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def load_extensions(environment, extensions):
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"""Load the extensions from the list and bind it to the environment.
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Returns a dict of instantiated environments.
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"""
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result = {}
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for extension in extensions:
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if isinstance(extension, string_types):
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extension = import_string(extension)
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result[extension.identifier] = extension(environment)
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return result
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def _environment_sanity_check(environment):
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"""Perform a sanity check on the environment."""
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assert issubclass(environment.undefined, Undefined), 'undefined must ' \
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'be a subclass of undefined because filters depend on it.'
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assert environment.block_start_string != \
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environment.variable_start_string != \
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environment.comment_start_string, 'block, variable and comment ' \
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'start strings must be different'
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assert environment.newline_sequence in ('\r', '\r\n', '\n'), \
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'newline_sequence set to unknown line ending string.'
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return environment
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class Environment(object):
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r"""The core component of Jinja is the `Environment`. It contains
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important shared variables like configuration, filters, tests,
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globals and others. Instances of this class may be modified if
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they are not shared and if no template was loaded so far.
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Modifications on environments after the first template was loaded
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will lead to surprising effects and undefined behavior.
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Here the possible initialization parameters:
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`block_start_string`
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The string marking the begin of a block. Defaults to ``'{%'``.
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`block_end_string`
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The string marking the end of a block. Defaults to ``'%}'``.
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`variable_start_string`
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The string marking the begin of a print statement.
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Defaults to ``'{{'``.
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`variable_end_string`
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The string marking the end of a print statement. Defaults to
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``'}}'``.
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`comment_start_string`
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The string marking the begin of a comment. Defaults to ``'{#'``.
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`comment_end_string`
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The string marking the end of a comment. Defaults to ``'#}'``.
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`line_statement_prefix`
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If given and a string, this will be used as prefix for line based
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statements. See also :ref:`line-statements`.
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`line_comment_prefix`
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If given and a string, this will be used as prefix for line based
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based comments. See also :ref:`line-statements`.
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.. versionadded:: 2.2
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`trim_blocks`
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If this is set to ``True`` the first newline after a block is
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removed (block, not variable tag!). Defaults to `False`.
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`lstrip_blocks`
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If this is set to ``True`` leading spaces and tabs are stripped
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from the start of a line to a block. Defaults to `False`.
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`newline_sequence`
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The sequence that starts a newline. Must be one of ``'\r'``,
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``'\n'`` or ``'\r\n'``. The default is ``'\n'`` which is a
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useful default for Linux and OS X systems as well as web
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applications.
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`keep_trailing_newline`
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Preserve the trailing newline when rendering templates.
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The default is ``False``, which causes a single newline,
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if present, to be stripped from the end of the template.
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.. versionadded:: 2.7
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`extensions`
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List of Jinja extensions to use. This can either be import paths
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as strings or extension classes. For more information have a
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look at :ref:`the extensions documentation <jinja-extensions>`.
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`optimized`
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should the optimizer be enabled? Default is `True`.
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`undefined`
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:class:`Undefined` or a subclass of it that is used to represent
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undefined values in the template.
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`finalize`
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A callable that can be used to process the result of a variable
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expression before it is output. For example one can convert
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`None` implicitly into an empty string here.
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`autoescape`
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If set to true the XML/HTML autoescaping feature is enabled by
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default. For more details about auto escaping see
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:class:`~jinja2.utils.Markup`. As of Jinja 2.4 this can also
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be a callable that is passed the template name and has to
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return `True` or `False` depending on autoescape should be
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enabled by default.
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.. versionchanged:: 2.4
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`autoescape` can now be a function
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`loader`
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The template loader for this environment.
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`cache_size`
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The size of the cache. Per default this is ``50`` which means
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that if more than 50 templates are loaded the loader will clean
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out the least recently used template. If the cache size is set to
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``0`` templates are recompiled all the time, if the cache size is
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``-1`` the cache will not be cleaned.
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`auto_reload`
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Some loaders load templates from locations where the template
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sources may change (ie: file system or database). If
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`auto_reload` is set to `True` (default) every time a template is
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requested the loader checks if the source changed and if yes, it
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will reload the template. For higher performance it's possible to
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disable that.
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`bytecode_cache`
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If set to a bytecode cache object, this object will provide a
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cache for the internal Jinja bytecode so that templates don't
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have to be parsed if they were not changed.
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See :ref:`bytecode-cache` for more information.
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"""
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#: if this environment is sandboxed. Modifying this variable won't make
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#: the environment sandboxed though. For a real sandboxed environment
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#: have a look at jinja2.sandbox. This flag alone controls the code
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#: generation by the compiler.
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sandboxed = False
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#: True if the environment is just an overlay
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overlayed = False
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#: the environment this environment is linked to if it is an overlay
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linked_to = None
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#: shared environments have this set to `True`. A shared environment
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#: must not be modified
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shared = False
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#: these are currently EXPERIMENTAL undocumented features.
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exception_handler = None
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exception_formatter = None
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def __init__(self,
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block_start_string=BLOCK_START_STRING,
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block_end_string=BLOCK_END_STRING,
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variable_start_string=VARIABLE_START_STRING,
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variable_end_string=VARIABLE_END_STRING,
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comment_start_string=COMMENT_START_STRING,
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comment_end_string=COMMENT_END_STRING,
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line_statement_prefix=LINE_STATEMENT_PREFIX,
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line_comment_prefix=LINE_COMMENT_PREFIX,
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trim_blocks=TRIM_BLOCKS,
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lstrip_blocks=LSTRIP_BLOCKS,
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newline_sequence=NEWLINE_SEQUENCE,
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keep_trailing_newline=KEEP_TRAILING_NEWLINE,
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extensions=(),
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optimized=True,
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undefined=Undefined,
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finalize=None,
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autoescape=False,
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loader=None,
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cache_size=50,
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auto_reload=True,
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bytecode_cache=None):
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# !!Important notice!!
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# The constructor accepts quite a few arguments that should be
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# passed by keyword rather than position. However it's important to
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# not change the order of arguments because it's used at least
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# internally in those cases:
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# - spontaneous environments (i18n extension and Template)
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# - unittests
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# If parameter changes are required only add parameters at the end
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# and don't change the arguments (or the defaults!) of the arguments
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# existing already.
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# lexer / parser information
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self.block_start_string = block_start_string
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self.block_end_string = block_end_string
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self.variable_start_string = variable_start_string
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self.variable_end_string = variable_end_string
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self.comment_start_string = comment_start_string
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self.comment_end_string = comment_end_string
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self.line_statement_prefix = line_statement_prefix
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self.line_comment_prefix = line_comment_prefix
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self.trim_blocks = trim_blocks
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self.lstrip_blocks = lstrip_blocks
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self.newline_sequence = newline_sequence
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self.keep_trailing_newline = keep_trailing_newline
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# runtime information
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self.undefined = undefined
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self.optimized = optimized
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self.finalize = finalize
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self.autoescape = autoescape
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# defaults
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self.filters = DEFAULT_FILTERS.copy()
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self.tests = DEFAULT_TESTS.copy()
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self.globals = DEFAULT_NAMESPACE.copy()
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# set the loader provided
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self.loader = loader
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self.cache = create_cache(cache_size)
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self.bytecode_cache = bytecode_cache
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self.auto_reload = auto_reload
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# load extensions
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self.extensions = load_extensions(self, extensions)
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_environment_sanity_check(self)
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def add_extension(self, extension):
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"""Adds an extension after the environment was created.
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.. versionadded:: 2.5
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"""
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self.extensions.update(load_extensions(self, [extension]))
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def extend(self, **attributes):
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"""Add the items to the instance of the environment if they do not exist
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yet. This is used by :ref:`extensions <writing-extensions>` to register
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callbacks and configuration values without breaking inheritance.
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"""
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for key, value in iteritems(attributes):
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if not hasattr(self, key):
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setattr(self, key, value)
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def overlay(self, block_start_string=missing, block_end_string=missing,
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variable_start_string=missing, variable_end_string=missing,
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comment_start_string=missing, comment_end_string=missing,
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line_statement_prefix=missing, line_comment_prefix=missing,
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trim_blocks=missing, lstrip_blocks=missing,
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extensions=missing, optimized=missing,
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undefined=missing, finalize=missing, autoescape=missing,
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loader=missing, cache_size=missing, auto_reload=missing,
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bytecode_cache=missing):
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"""Create a new overlay environment that shares all the data with the
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current environment except of cache and the overridden attributes.
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Extensions cannot be removed for an overlayed environment. An overlayed
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environment automatically gets all the extensions of the environment it
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is linked to plus optional extra extensions.
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Creating overlays should happen after the initial environment was set
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up completely. Not all attributes are truly linked, some are just
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copied over so modifications on the original environment may not shine
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through.
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"""
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args = dict(locals())
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del args['self'], args['cache_size'], args['extensions']
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rv = object.__new__(self.__class__)
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rv.__dict__.update(self.__dict__)
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rv.overlayed = True
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rv.linked_to = self
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for key, value in iteritems(args):
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if value is not missing:
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setattr(rv, key, value)
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if cache_size is not missing:
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rv.cache = create_cache(cache_size)
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else:
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rv.cache = copy_cache(self.cache)
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rv.extensions = {}
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for key, value in iteritems(self.extensions):
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rv.extensions[key] = value.bind(rv)
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if extensions is not missing:
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rv.extensions.update(load_extensions(rv, extensions))
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return _environment_sanity_check(rv)
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lexer = property(get_lexer, doc="The lexer for this environment.")
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def iter_extensions(self):
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"""Iterates over the extensions by priority."""
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return iter(sorted(self.extensions.values(),
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key=lambda x: x.priority))
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def getitem(self, obj, argument):
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"""Get an item or attribute of an object but prefer the item."""
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try:
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return obj[argument]
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except (TypeError, LookupError):
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if isinstance(argument, string_types):
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try:
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attr = str(argument)
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except Exception:
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pass
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else:
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try:
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return getattr(obj, attr)
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except AttributeError:
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pass
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return self.undefined(obj=obj, name=argument)
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def getattr(self, obj, attribute):
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"""Get an item or attribute of an object but prefer the attribute.
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Unlike :meth:`getitem` the attribute *must* be a bytestring.
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"""
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try:
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return getattr(obj, attribute)
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except AttributeError:
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pass
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try:
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return obj[attribute]
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except (TypeError, LookupError, AttributeError):
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return self.undefined(obj=obj, name=attribute)
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def call_filter(self, name, value, args=None, kwargs=None,
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context=None, eval_ctx=None):
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"""Invokes a filter on a value the same way the compiler does it.
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.. versionadded:: 2.7
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"""
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func = self.filters.get(name)
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if func is None:
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raise TemplateRuntimeError('no filter named %r' % name)
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args = [value] + list(args or ())
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if getattr(func, 'contextfilter', False):
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if context is None:
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raise TemplateRuntimeError('Attempted to invoke context '
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'filter without context')
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args.insert(0, context)
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elif getattr(func, 'evalcontextfilter', False):
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if eval_ctx is None:
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if context is not None:
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eval_ctx = context.eval_ctx
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else:
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eval_ctx = EvalContext(self)
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args.insert(0, eval_ctx)
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elif getattr(func, 'environmentfilter', False):
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args.insert(0, self)
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return func(*args, **(kwargs or {}))
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def call_test(self, name, value, args=None, kwargs=None):
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"""Invokes a test on a value the same way the compiler does it.
|
|
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|
.. versionadded:: 2.7
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"""
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func = self.tests.get(name)
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if func is None:
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raise TemplateRuntimeError('no test named %r' % name)
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return func(value, *(args or ()), **(kwargs or {}))
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@internalcode
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def parse(self, source, name=None, filename=None):
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"""Parse the sourcecode and return the abstract syntax tree. This
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tree of nodes is used by the compiler to convert the template into
|
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executable source- or bytecode. This is useful for debugging or to
|
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extract information from templates.
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If you are :ref:`developing Jinja2 extensions <writing-extensions>`
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this gives you a good overview of the node tree generated.
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"""
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try:
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return self._parse(source, name, filename)
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except TemplateSyntaxError:
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exc_info = sys.exc_info()
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self.handle_exception(exc_info, source_hint=source)
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|
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def _parse(self, source, name, filename):
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"""Internal parsing function used by `parse` and `compile`."""
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return Parser(self, source, name, encode_filename(filename)).parse()
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def lex(self, source, name=None, filename=None):
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"""Lex the given sourcecode and return a generator that yields
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tokens as tuples in the form ``(lineno, token_type, value)``.
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|
This can be useful for :ref:`extension development <writing-extensions>`
|
|
and debugging templates.
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|
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|
This does not perform preprocessing. If you want the preprocessing
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|
of the extensions to be applied you have to filter source through
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the :meth:`preprocess` method.
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"""
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source = text_type(source)
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try:
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return self.lexer.tokeniter(source, name, filename)
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except TemplateSyntaxError:
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exc_info = sys.exc_info()
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self.handle_exception(exc_info, source_hint=source)
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def preprocess(self, source, name=None, filename=None):
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"""Preprocesses the source with all extensions. This is automatically
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called for all parsing and compiling methods but *not* for :meth:`lex`
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because there you usually only want the actual source tokenized.
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"""
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return reduce(lambda s, e: e.preprocess(s, name, filename),
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self.iter_extensions(), text_type(source))
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def _tokenize(self, source, name, filename=None, state=None):
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"""Called by the parser to do the preprocessing and filtering
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for all the extensions. Returns a :class:`~jinja2.lexer.TokenStream`.
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"""
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source = self.preprocess(source, name, filename)
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stream = self.lexer.tokenize(source, name, filename, state)
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for ext in self.iter_extensions():
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stream = ext.filter_stream(stream)
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if not isinstance(stream, TokenStream):
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stream = TokenStream(stream, name, filename)
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return stream
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|
|
def _generate(self, source, name, filename, defer_init=False):
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|
"""Internal hook that can be overridden to hook a different generate
|
|
method in.
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|
|
.. versionadded:: 2.5
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|
"""
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|
return generate(source, self, name, filename, defer_init=defer_init)
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|
|
def _compile(self, source, filename):
|
|
"""Internal hook that can be overridden to hook a different compile
|
|
method in.
|
|
|
|
.. versionadded:: 2.5
|
|
"""
|
|
return compile(source, filename, 'exec')
|
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|
|
@internalcode
|
|
def compile(self, source, name=None, filename=None, raw=False,
|
|
defer_init=False):
|
|
"""Compile a node or template source code. The `name` parameter is
|
|
the load name of the template after it was joined using
|
|
:meth:`join_path` if necessary, not the filename on the file system.
|
|
the `filename` parameter is the estimated filename of the template on
|
|
the file system. If the template came from a database or memory this
|
|
can be omitted.
|
|
|
|
The return value of this method is a python code object. If the `raw`
|
|
parameter is `True` the return value will be a string with python
|
|
code equivalent to the bytecode returned otherwise. This method is
|
|
mainly used internally.
|
|
|
|
`defer_init` is use internally to aid the module code generator. This
|
|
causes the generated code to be able to import without the global
|
|
environment variable to be set.
|
|
|
|
.. versionadded:: 2.4
|
|
`defer_init` parameter added.
|
|
"""
|
|
source_hint = None
|
|
try:
|
|
if isinstance(source, string_types):
|
|
source_hint = source
|
|
source = self._parse(source, name, filename)
|
|
if self.optimized:
|
|
source = optimize(source, self)
|
|
source = self._generate(source, name, filename,
|
|
defer_init=defer_init)
|
|
if raw:
|
|
return source
|
|
if filename is None:
|
|
filename = '<template>'
|
|
else:
|
|
filename = encode_filename(filename)
|
|
return self._compile(source, filename)
|
|
except TemplateSyntaxError:
|
|
exc_info = sys.exc_info()
|
|
self.handle_exception(exc_info, source_hint=source)
|
|
|
|
def compile_expression(self, source, undefined_to_none=True):
|
|
"""A handy helper method that returns a callable that accepts keyword
|
|
arguments that appear as variables in the expression. If called it
|
|
returns the result of the expression.
|
|
|
|
This is useful if applications want to use the same rules as Jinja
|
|
in template "configuration files" or similar situations.
|
|
|
|
Example usage:
|
|
|
|
>>> env = Environment()
|
|
>>> expr = env.compile_expression('foo == 42')
|
|
>>> expr(foo=23)
|
|
False
|
|
>>> expr(foo=42)
|
|
True
|
|
|
|
Per default the return value is converted to `None` if the
|
|
expression returns an undefined value. This can be changed
|
|
by setting `undefined_to_none` to `False`.
|
|
|
|
>>> env.compile_expression('var')() is None
|
|
True
|
|
>>> env.compile_expression('var', undefined_to_none=False)()
|
|
Undefined
|
|
|
|
.. versionadded:: 2.1
|
|
"""
|
|
parser = Parser(self, source, state='variable')
|
|
exc_info = None
|
|
try:
|
|
expr = parser.parse_expression()
|
|
if not parser.stream.eos:
|
|
raise TemplateSyntaxError('chunk after expression',
|
|
parser.stream.current.lineno,
|
|
None, None)
|
|
expr.set_environment(self)
|
|
except TemplateSyntaxError:
|
|
exc_info = sys.exc_info()
|
|
if exc_info is not None:
|
|
self.handle_exception(exc_info, source_hint=source)
|
|
body = [nodes.Assign(nodes.Name('result', 'store'), expr, lineno=1)]
|
|
template = self.from_string(nodes.Template(body, lineno=1))
|
|
return TemplateExpression(template, undefined_to_none)
|
|
|
|
def compile_templates(self, target, extensions=None, filter_func=None,
|
|
zip='deflated', log_function=None,
|
|
ignore_errors=True, py_compile=False):
|
|
"""Finds all the templates the loader can find, compiles them
|
|
and stores them in `target`. If `zip` is `None`, instead of in a
|
|
zipfile, the templates will be will be stored in a directory.
|
|
By default a deflate zip algorithm is used, to switch to
|
|
the stored algorithm, `zip` can be set to ``'stored'``.
|
|
|
|
`extensions` and `filter_func` are passed to :meth:`list_templates`.
|
|
Each template returned will be compiled to the target folder or
|
|
zipfile.
|
|
|
|
By default template compilation errors are ignored. In case a
|
|
log function is provided, errors are logged. If you want template
|
|
syntax errors to abort the compilation you can set `ignore_errors`
|
|
to `False` and you will get an exception on syntax errors.
|
|
|
|
If `py_compile` is set to `True` .pyc files will be written to the
|
|
target instead of standard .py files. This flag does not do anything
|
|
on pypy and Python 3 where pyc files are not picked up by itself and
|
|
don't give much benefit.
|
|
|
|
.. versionadded:: 2.4
|
|
"""
|
|
from jinja2.loaders import ModuleLoader
|
|
|
|
if log_function is None:
|
|
log_function = lambda x: None
|
|
|
|
if py_compile:
|
|
if not PY2 or PYPY:
|
|
from warnings import warn
|
|
warn(Warning('py_compile has no effect on pypy or Python 3'))
|
|
py_compile = False
|
|
else:
|
|
import imp, marshal
|
|
py_header = imp.get_magic() + \
|
|
u'\xff\xff\xff\xff'.encode('iso-8859-15')
|
|
|
|
# Python 3.3 added a source filesize to the header
|
|
if sys.version_info >= (3, 3):
|
|
py_header += u'\x00\x00\x00\x00'.encode('iso-8859-15')
|
|
|
|
def write_file(filename, data, mode):
|
|
if zip:
|
|
info = ZipInfo(filename)
|
|
info.external_attr = 0o755 << 16
|
|
zip_file.writestr(info, data)
|
|
else:
|
|
f = open(os.path.join(target, filename), mode)
|
|
try:
|
|
f.write(data)
|
|
finally:
|
|
f.close()
|
|
|
|
if zip is not None:
|
|
from zipfile import ZipFile, ZipInfo, ZIP_DEFLATED, ZIP_STORED
|
|
zip_file = ZipFile(target, 'w', dict(deflated=ZIP_DEFLATED,
|
|
stored=ZIP_STORED)[zip])
|
|
log_function('Compiling into Zip archive "%s"' % target)
|
|
else:
|
|
if not os.path.isdir(target):
|
|
os.makedirs(target)
|
|
log_function('Compiling into folder "%s"' % target)
|
|
|
|
try:
|
|
for name in self.list_templates(extensions, filter_func):
|
|
source, filename, _ = self.loader.get_source(self, name)
|
|
try:
|
|
code = self.compile(source, name, filename, True, True)
|
|
except TemplateSyntaxError as e:
|
|
if not ignore_errors:
|
|
raise
|
|
log_function('Could not compile "%s": %s' % (name, e))
|
|
continue
|
|
|
|
filename = ModuleLoader.get_module_filename(name)
|
|
|
|
if py_compile:
|
|
c = self._compile(code, encode_filename(filename))
|
|
write_file(filename + 'c', py_header +
|
|
marshal.dumps(c), 'wb')
|
|
log_function('Byte-compiled "%s" as %s' %
|
|
(name, filename + 'c'))
|
|
else:
|
|
write_file(filename, code, 'w')
|
|
log_function('Compiled "%s" as %s' % (name, filename))
|
|
finally:
|
|
if zip:
|
|
zip_file.close()
|
|
|
|
log_function('Finished compiling templates')
|
|
|
|
def list_templates(self, extensions=None, filter_func=None):
|
|
"""Returns a list of templates for this environment. This requires
|
|
that the loader supports the loader's
|
|
:meth:`~BaseLoader.list_templates` method.
|
|
|
|
If there are other files in the template folder besides the
|
|
actual templates, the returned list can be filtered. There are two
|
|
ways: either `extensions` is set to a list of file extensions for
|
|
templates, or a `filter_func` can be provided which is a callable that
|
|
is passed a template name and should return `True` if it should end up
|
|
in the result list.
|
|
|
|
If the loader does not support that, a :exc:`TypeError` is raised.
|
|
|
|
.. versionadded:: 2.4
|
|
"""
|
|
x = self.loader.list_templates()
|
|
if extensions is not None:
|
|
if filter_func is not None:
|
|
raise TypeError('either extensions or filter_func '
|
|
'can be passed, but not both')
|
|
filter_func = lambda x: '.' in x and \
|
|
x.rsplit('.', 1)[1] in extensions
|
|
if filter_func is not None:
|
|
x = ifilter(filter_func, x)
|
|
return x
|
|
|
|
def handle_exception(self, exc_info=None, rendered=False, source_hint=None):
|
|
"""Exception handling helper. This is used internally to either raise
|
|
rewritten exceptions or return a rendered traceback for the template.
|
|
"""
|
|
global _make_traceback
|
|
if exc_info is None:
|
|
exc_info = sys.exc_info()
|
|
|
|
# the debugging module is imported when it's used for the first time.
|
|
# we're doing a lot of stuff there and for applications that do not
|
|
# get any exceptions in template rendering there is no need to load
|
|
# all of that.
|
|
if _make_traceback is None:
|
|
from jinja2.debug import make_traceback as _make_traceback
|
|
traceback = _make_traceback(exc_info, source_hint)
|
|
if rendered and self.exception_formatter is not None:
|
|
return self.exception_formatter(traceback)
|
|
if self.exception_handler is not None:
|
|
self.exception_handler(traceback)
|
|
exc_type, exc_value, tb = traceback.standard_exc_info
|
|
reraise(exc_type, exc_value, tb)
|
|
|
|
def join_path(self, template, parent):
|
|
"""Join a template with the parent. By default all the lookups are
|
|
relative to the loader root so this method returns the `template`
|
|
parameter unchanged, but if the paths should be relative to the
|
|
parent template, this function can be used to calculate the real
|
|
template name.
|
|
|
|
Subclasses may override this method and implement template path
|
|
joining here.
|
|
"""
|
|
return template
|
|
|
|
@internalcode
|
|
def _load_template(self, name, globals):
|
|
if self.loader is None:
|
|
raise TypeError('no loader for this environment specified')
|
|
if self.cache is not None:
|
|
template = self.cache.get(name)
|
|
if template is not None and (not self.auto_reload or \
|
|
template.is_up_to_date):
|
|
return template
|
|
template = self.loader.load(self, name, globals)
|
|
if self.cache is not None:
|
|
self.cache[name] = template
|
|
return template
|
|
|
|
@internalcode
|
|
def get_template(self, name, parent=None, globals=None):
|
|
"""Load a template from the loader. If a loader is configured this
|
|
method ask the loader for the template and returns a :class:`Template`.
|
|
If the `parent` parameter is not `None`, :meth:`join_path` is called
|
|
to get the real template name before loading.
|
|
|
|
The `globals` parameter can be used to provide template wide globals.
|
|
These variables are available in the context at render time.
|
|
|
|
If the template does not exist a :exc:`TemplateNotFound` exception is
|
|
raised.
|
|
|
|
.. versionchanged:: 2.4
|
|
If `name` is a :class:`Template` object it is returned from the
|
|
function unchanged.
|
|
"""
|
|
if isinstance(name, Template):
|
|
return name
|
|
if parent is not None:
|
|
name = self.join_path(name, parent)
|
|
return self._load_template(name, self.make_globals(globals))
|
|
|
|
@internalcode
|
|
def select_template(self, names, parent=None, globals=None):
|
|
"""Works like :meth:`get_template` but tries a number of templates
|
|
before it fails. If it cannot find any of the templates, it will
|
|
raise a :exc:`TemplatesNotFound` exception.
|
|
|
|
.. versionadded:: 2.3
|
|
|
|
.. versionchanged:: 2.4
|
|
If `names` contains a :class:`Template` object it is returned
|
|
from the function unchanged.
|
|
"""
|
|
if not names:
|
|
raise TemplatesNotFound(message=u'Tried to select from an empty list '
|
|
u'of templates.')
|
|
globals = self.make_globals(globals)
|
|
for name in names:
|
|
if isinstance(name, Template):
|
|
return name
|
|
if parent is not None:
|
|
name = self.join_path(name, parent)
|
|
try:
|
|
return self._load_template(name, globals)
|
|
except TemplateNotFound:
|
|
pass
|
|
raise TemplatesNotFound(names)
|
|
|
|
@internalcode
|
|
def get_or_select_template(self, template_name_or_list,
|
|
parent=None, globals=None):
|
|
"""Does a typecheck and dispatches to :meth:`select_template`
|
|
if an iterable of template names is given, otherwise to
|
|
:meth:`get_template`.
|
|
|
|
.. versionadded:: 2.3
|
|
"""
|
|
if isinstance(template_name_or_list, string_types):
|
|
return self.get_template(template_name_or_list, parent, globals)
|
|
elif isinstance(template_name_or_list, Template):
|
|
return template_name_or_list
|
|
return self.select_template(template_name_or_list, parent, globals)
|
|
|
|
def from_string(self, source, globals=None, template_class=None):
|
|
"""Load a template from a string. This parses the source given and
|
|
returns a :class:`Template` object.
|
|
"""
|
|
globals = self.make_globals(globals)
|
|
cls = template_class or self.template_class
|
|
return cls.from_code(self, self.compile(source), globals, None)
|
|
|
|
def make_globals(self, d):
|
|
"""Return a dict for the globals."""
|
|
if not d:
|
|
return self.globals
|
|
return dict(self.globals, **d)
|
|
|
|
|
|
class Template(object):
|
|
"""The central template object. This class represents a compiled template
|
|
and is used to evaluate it.
|
|
|
|
Normally the template object is generated from an :class:`Environment` but
|
|
it also has a constructor that makes it possible to create a template
|
|
instance directly using the constructor. It takes the same arguments as
|
|
the environment constructor but it's not possible to specify a loader.
|
|
|
|
Every template object has a few methods and members that are guaranteed
|
|
to exist. However it's important that a template object should be
|
|
considered immutable. Modifications on the object are not supported.
|
|
|
|
Template objects created from the constructor rather than an environment
|
|
do have an `environment` attribute that points to a temporary environment
|
|
that is probably shared with other templates created with the constructor
|
|
and compatible settings.
|
|
|
|
>>> template = Template('Hello {{ name }}!')
|
|
>>> template.render(name='John Doe')
|
|
u'Hello John Doe!'
|
|
|
|
>>> stream = template.stream(name='John Doe')
|
|
>>> stream.next()
|
|
u'Hello John Doe!'
|
|
>>> stream.next()
|
|
Traceback (most recent call last):
|
|
...
|
|
StopIteration
|
|
"""
|
|
|
|
def __new__(cls, source,
|
|
block_start_string=BLOCK_START_STRING,
|
|
block_end_string=BLOCK_END_STRING,
|
|
variable_start_string=VARIABLE_START_STRING,
|
|
variable_end_string=VARIABLE_END_STRING,
|
|
comment_start_string=COMMENT_START_STRING,
|
|
comment_end_string=COMMENT_END_STRING,
|
|
line_statement_prefix=LINE_STATEMENT_PREFIX,
|
|
line_comment_prefix=LINE_COMMENT_PREFIX,
|
|
trim_blocks=TRIM_BLOCKS,
|
|
lstrip_blocks=LSTRIP_BLOCKS,
|
|
newline_sequence=NEWLINE_SEQUENCE,
|
|
keep_trailing_newline=KEEP_TRAILING_NEWLINE,
|
|
extensions=(),
|
|
optimized=True,
|
|
undefined=Undefined,
|
|
finalize=None,
|
|
autoescape=False):
|
|
env = get_spontaneous_environment(
|
|
block_start_string, block_end_string, variable_start_string,
|
|
variable_end_string, comment_start_string, comment_end_string,
|
|
line_statement_prefix, line_comment_prefix, trim_blocks,
|
|
lstrip_blocks, newline_sequence, keep_trailing_newline,
|
|
frozenset(extensions), optimized, undefined, finalize, autoescape,
|
|
None, 0, False, None)
|
|
return env.from_string(source, template_class=cls)
|
|
|
|
@classmethod
|
|
def from_code(cls, environment, code, globals, uptodate=None):
|
|
"""Creates a template object from compiled code and the globals. This
|
|
is used by the loaders and environment to create a template object.
|
|
"""
|
|
namespace = {
|
|
'environment': environment,
|
|
'__file__': code.co_filename
|
|
}
|
|
exec(code, namespace)
|
|
rv = cls._from_namespace(environment, namespace, globals)
|
|
rv._uptodate = uptodate
|
|
return rv
|
|
|
|
@classmethod
|
|
def from_module_dict(cls, environment, module_dict, globals):
|
|
"""Creates a template object from a module. This is used by the
|
|
module loader to create a template object.
|
|
|
|
.. versionadded:: 2.4
|
|
"""
|
|
return cls._from_namespace(environment, module_dict, globals)
|
|
|
|
@classmethod
|
|
def _from_namespace(cls, environment, namespace, globals):
|
|
t = object.__new__(cls)
|
|
t.environment = environment
|
|
t.globals = globals
|
|
t.name = namespace['name']
|
|
t.filename = namespace['__file__']
|
|
t.blocks = namespace['blocks']
|
|
|
|
# render function and module
|
|
t.root_render_func = namespace['root']
|
|
t._module = None
|
|
|
|
# debug and loader helpers
|
|
t._debug_info = namespace['debug_info']
|
|
t._uptodate = None
|
|
|
|
# store the reference
|
|
namespace['environment'] = environment
|
|
namespace['__jinja_template__'] = t
|
|
|
|
return t
|
|
|
|
def render(self, *args, **kwargs):
|
|
"""This method accepts the same arguments as the `dict` constructor:
|
|
A dict, a dict subclass or some keyword arguments. If no arguments
|
|
are given the context will be empty. These two calls do the same::
|
|
|
|
template.render(knights='that say nih')
|
|
template.render({'knights': 'that say nih'})
|
|
|
|
This will return the rendered template as unicode string.
|
|
"""
|
|
vars = dict(*args, **kwargs)
|
|
try:
|
|
return concat(self.root_render_func(self.new_context(vars)))
|
|
except Exception:
|
|
exc_info = sys.exc_info()
|
|
return self.environment.handle_exception(exc_info, True)
|
|
|
|
def stream(self, *args, **kwargs):
|
|
"""Works exactly like :meth:`generate` but returns a
|
|
:class:`TemplateStream`.
|
|
"""
|
|
return TemplateStream(self.generate(*args, **kwargs))
|
|
|
|
def generate(self, *args, **kwargs):
|
|
"""For very large templates it can be useful to not render the whole
|
|
template at once but evaluate each statement after another and yield
|
|
piece for piece. This method basically does exactly that and returns
|
|
a generator that yields one item after another as unicode strings.
|
|
|
|
It accepts the same arguments as :meth:`render`.
|
|
"""
|
|
vars = dict(*args, **kwargs)
|
|
try:
|
|
for event in self.root_render_func(self.new_context(vars)):
|
|
yield event
|
|
except Exception:
|
|
exc_info = sys.exc_info()
|
|
else:
|
|
return
|
|
yield self.environment.handle_exception(exc_info, True)
|
|
|
|
def new_context(self, vars=None, shared=False, locals=None):
|
|
"""Create a new :class:`Context` for this template. The vars
|
|
provided will be passed to the template. Per default the globals
|
|
are added to the context. If shared is set to `True` the data
|
|
is passed as it to the context without adding the globals.
|
|
|
|
`locals` can be a dict of local variables for internal usage.
|
|
"""
|
|
return new_context(self.environment, self.name, self.blocks,
|
|
vars, shared, self.globals, locals)
|
|
|
|
def make_module(self, vars=None, shared=False, locals=None):
|
|
"""This method works like the :attr:`module` attribute when called
|
|
without arguments but it will evaluate the template on every call
|
|
rather than caching it. It's also possible to provide
|
|
a dict which is then used as context. The arguments are the same
|
|
as for the :meth:`new_context` method.
|
|
"""
|
|
return TemplateModule(self, self.new_context(vars, shared, locals))
|
|
|
|
@property
|
|
def module(self):
|
|
"""The template as module. This is used for imports in the
|
|
template runtime but is also useful if one wants to access
|
|
exported template variables from the Python layer:
|
|
|
|
>>> t = Template('{% macro foo() %}42{% endmacro %}23')
|
|
>>> unicode(t.module)
|
|
u'23'
|
|
>>> t.module.foo()
|
|
u'42'
|
|
"""
|
|
if self._module is not None:
|
|
return self._module
|
|
self._module = rv = self.make_module()
|
|
return rv
|
|
|
|
def get_corresponding_lineno(self, lineno):
|
|
"""Return the source line number of a line number in the
|
|
generated bytecode as they are not in sync.
|
|
"""
|
|
for template_line, code_line in reversed(self.debug_info):
|
|
if code_line <= lineno:
|
|
return template_line
|
|
return 1
|
|
|
|
@property
|
|
def is_up_to_date(self):
|
|
"""If this variable is `False` there is a newer version available."""
|
|
if self._uptodate is None:
|
|
return True
|
|
return self._uptodate()
|
|
|
|
@property
|
|
def debug_info(self):
|
|
"""The debug info mapping."""
|
|
return [tuple(imap(int, x.split('='))) for x in
|
|
self._debug_info.split('&')]
|
|
|
|
def __repr__(self):
|
|
if self.name is None:
|
|
name = 'memory:%x' % id(self)
|
|
else:
|
|
name = repr(self.name)
|
|
return '<%s %s>' % (self.__class__.__name__, name)
|
|
|
|
|
|
@implements_to_string
|
|
class TemplateModule(object):
|
|
"""Represents an imported template. All the exported names of the
|
|
template are available as attributes on this object. Additionally
|
|
converting it into an unicode- or bytestrings renders the contents.
|
|
"""
|
|
|
|
def __init__(self, template, context):
|
|
self._body_stream = list(template.root_render_func(context))
|
|
self.__dict__.update(context.get_exported())
|
|
self.__name__ = template.name
|
|
|
|
def __html__(self):
|
|
return Markup(concat(self._body_stream))
|
|
|
|
def __str__(self):
|
|
return concat(self._body_stream)
|
|
|
|
def __repr__(self):
|
|
if self.__name__ is None:
|
|
name = 'memory:%x' % id(self)
|
|
else:
|
|
name = repr(self.__name__)
|
|
return '<%s %s>' % (self.__class__.__name__, name)
|
|
|
|
|
|
class TemplateExpression(object):
|
|
"""The :meth:`jinja2.Environment.compile_expression` method returns an
|
|
instance of this object. It encapsulates the expression-like access
|
|
to the template with an expression it wraps.
|
|
"""
|
|
|
|
def __init__(self, template, undefined_to_none):
|
|
self._template = template
|
|
self._undefined_to_none = undefined_to_none
|
|
|
|
def __call__(self, *args, **kwargs):
|
|
context = self._template.new_context(dict(*args, **kwargs))
|
|
consume(self._template.root_render_func(context))
|
|
rv = context.vars['result']
|
|
if self._undefined_to_none and isinstance(rv, Undefined):
|
|
rv = None
|
|
return rv
|
|
|
|
|
|
@implements_iterator
|
|
class TemplateStream(object):
|
|
"""A template stream works pretty much like an ordinary python generator
|
|
but it can buffer multiple items to reduce the number of total iterations.
|
|
Per default the output is unbuffered which means that for every unbuffered
|
|
instruction in the template one unicode string is yielded.
|
|
|
|
If buffering is enabled with a buffer size of 5, five items are combined
|
|
into a new unicode string. This is mainly useful if you are streaming
|
|
big templates to a client via WSGI which flushes after each iteration.
|
|
"""
|
|
|
|
def __init__(self, gen):
|
|
self._gen = gen
|
|
self.disable_buffering()
|
|
|
|
def dump(self, fp, encoding=None, errors='strict'):
|
|
"""Dump the complete stream into a file or file-like object.
|
|
Per default unicode strings are written, if you want to encode
|
|
before writing specify an `encoding`.
|
|
|
|
Example usage::
|
|
|
|
Template('Hello {{ name }}!').stream(name='foo').dump('hello.html')
|
|
"""
|
|
close = False
|
|
if isinstance(fp, string_types):
|
|
fp = open(fp, encoding is None and 'w' or 'wb')
|
|
close = True
|
|
try:
|
|
if encoding is not None:
|
|
iterable = (x.encode(encoding, errors) for x in self)
|
|
else:
|
|
iterable = self
|
|
if hasattr(fp, 'writelines'):
|
|
fp.writelines(iterable)
|
|
else:
|
|
for item in iterable:
|
|
fp.write(item)
|
|
finally:
|
|
if close:
|
|
fp.close()
|
|
|
|
def disable_buffering(self):
|
|
"""Disable the output buffering."""
|
|
self._next = get_next(self._gen)
|
|
self.buffered = False
|
|
|
|
def enable_buffering(self, size=5):
|
|
"""Enable buffering. Buffer `size` items before yielding them."""
|
|
if size <= 1:
|
|
raise ValueError('buffer size too small')
|
|
|
|
def generator(next):
|
|
buf = []
|
|
c_size = 0
|
|
push = buf.append
|
|
|
|
while 1:
|
|
try:
|
|
while c_size < size:
|
|
c = next()
|
|
push(c)
|
|
if c:
|
|
c_size += 1
|
|
except StopIteration:
|
|
if not c_size:
|
|
return
|
|
yield concat(buf)
|
|
del buf[:]
|
|
c_size = 0
|
|
|
|
self.buffered = True
|
|
self._next = get_next(generator(get_next(self._gen)))
|
|
|
|
def __iter__(self):
|
|
return self
|
|
|
|
def __next__(self):
|
|
return self._next()
|
|
|
|
|
|
# hook in default template class. if anyone reads this comment: ignore that
|
|
# it's possible to use custom templates ;-)
|
|
Environment.template_class = Template
|