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Name: Chameleon
Version: 2.6.1
Summary: Fast HTML/XML Template Compiler.
Home-page: http://www.pagetemplates.org/
Author: Malthe Borch
Author-email: mborch@gmail.com
License: BSD-like (http://repoze.org/license.html)
Description: Overview
========
Chameleon is an HTML/XML template engine for `Python
<http://www.python.org>`_. It uses the *page templates* language.
You can use it in any Python web application with just about any
version of Python (2.5 and up, including 3.x and `pypy
<http://pypy.org>`_).
Visit the `website <http://pagetemplates.org>`_ for more information
or the `documentation <http://pagetemplates.org/docs/latest/>`_.
License and Copyright
---------------------
This software is made available as-is under a BSD-like license [1]_
(see included copyright notice).
Notes
-----
.. [1] This software is licensed under the `Repoze
<http://repoze.org/license.html>`_ license.
Changes
=======
2.6.1 (2011-11-30)
------------------
Bugfixes:
- Decode HTML entities in expression interpolation strings. This fixes
issue #74.
- Allow ``xml`` and ``xmlns`` attributes on TAL, I18N and METAL
namespace elements. This fixes issue #73.
2.6.0 (2011-11-24)
------------------
Features:
- Added support for implicit translation:
The ``implicit_i18n_translate`` option enables implicit translation
of text. The ``implicit_i18n_attributes`` enables implicit
translation of attributes. The latter must be a set and for an
attribute to be implicitly translated, its lowercase string value
must be included in the set.
- Added option ``strict`` (enabled by default) which decides whether
expressions are required to be valid at compile time. That is, if
not set, an exception is only raised for an invalid expression at
evaluation time.
- An expression error now results in an exception only if the
expression is attempted evaluated during a rendering.
- Added a configuration option ``prepend_relative_search_path`` which
decides whether the path relative to a file-based template is
prepended to the load search path. The default is ``True``.
- Added a configuration option ``search_path`` to the file-based
template class, which adds additional paths to the template load
instance bound to the ``load:`` expression. The option takes a
string path or an iterable yielding string paths. The default value
is the empty set.
Bugfixes:
- Exception instances now support pickle/unpickle.
- An attributes in i18n:attributes no longer needs to match an
existing or dynamic attribute in order to appear in the
element. This fixes issue #66.
2.5.3 (2011-10-23)
------------------
Bugfixes:
- Fixed an issue where a nested macro slot definition would fail even
though there existed a parent macro definition. This fixes issue
#69.
2.5.2 (2011-10-12)
------------------
Bugfixes:
- Fixed an issue where technically invalid input would result in a
compiler error.
Features:
- The markup class now inherits from the unicode string type such that
it's compatible with the string interface.
2.5.1 (2011-09-29)
------------------
Bugfixes:
- The symbol names "convert", "decode" and "translate" are now no
longer set as read-only *compiler internals*. This fixes issue #65.
- Fixed an issue where a macro extension chain nested two levels (a
template uses a macro that extends a macro) would lose the middle
slot definitions if slots were defined nested.
The compiler now throws an error if a nested slot definition is used
outside a macro extension context.
2.5.0 (2011-09-23)
------------------
Features:
- An expression type ``structure:`` is now available which wraps the
expression result as *structure* such that it is not escaped on
insertion, e.g.::
<div id="content">
${structure: context.body}
</div>
This also means that the ``structure`` keyword for ``tal:content``
and ``tal:replace`` now has an alternative spelling via the
expression type ``structure:``.
- The string-based template constructor now accepts encoded input.
2.4.6 (2011-09-23)
------------------
Bugfixes:
- The ``tal:on-error`` statement should catch all exceptions.
- Fixed issue that would prevent escaping of interpolation expression
values appearing in text.
2.4.5 (2011-09-21)
------------------
Bugfixes:
- The ``tal:on-error`` handler should have a ``error`` variable
defined that has the value of the exception thrown.
- The ``tal:on-error`` statement is a substitution statement and
should support the "text" and "structure" insertion methods.
2.4.4 (2011-09-15)
------------------
Bugfixes:
- An encoding specified in the XML document preamble is now read and
used to decode the template input to unicode. This fixes issue #55.
- Encoded expression input on Python 3 is now correctly
decoded. Previously, the string representation output would be
included instead of an actually decoded string.
- Expression result conversion steps are now correctly included in
error handling such that the exception output points to the
expression location.
2.4.3 (2011-09-13)
------------------
Features:
- When an encoding is provided, pass the 'ignore' flag to avoid
decoding issues with bad input.
Bugfixes:
- Fixed pypy compatibility issue (introduced in previous release).
2.4.2 (2011-09-13)
------------------
Bugfixes:
- Fixed an issue in the compiler where an internal variable (such as a
translation default value) would be cached, resulting in variable
scope corruption (see issue #49).
2.4.1 (2011-09-08)
------------------
Bugfixes:
- Fixed an issue where a default value for an attribute would
sometimes spill over into another attribute.
- Fixed issue where the use of the ``default`` name in an attribute
interpolation expression would print the attribute value. This is
unexpected, because it's an expression, not a static text suitable
for output. An attribute value of ``default`` now correctly drops
the attribute.
2.4.0 (2011-08-22)
------------------
Features:
- Added an option ``boolean_attributes`` to evaluate and render a
provided set of attributes using a boolean logic: if the attribute
is a true value, the value will be the attribute name, otherwise the
attribute is dropped.
In the reference implementation, the following attributes are
configured as boolean values when the template is rendered in
HTML-mode::
"compact", "nowrap", "ismap", "declare", "noshade",
"checked", "disabled", "readonly", "multiple", "selected",
"noresize", "defer"
Note that in Chameleon, these attributes must be manually provided.
Bugfixes:
- The carriage return character (used on Windows platforms) would
incorrectly be included in Python comments.
It is now replaced with a line break.
This fixes issue #44.
2.3.8 (2011-08-19)
------------------
- Fixed import error that affected Python 2.5 only.
2.3.7 (2011-08-19)
------------------
Features:
- Added an option ``literal_false`` that disables the default behavior
of dropping an attribute for a value of ``False`` (in addition to
``None``). This modified behavior is the behavior exhibited in
reference implementation.
Bugfixes:
- Undo attribute special HTML attribute behavior (see previous
release).
This turned out not to be a compatible behavior; rather, boolean
values should simply be coerced to a string.
Meanwhile, the reference implementation does support an HTML mode in
which the special attribute behavior is exhibited.
We do not currently support this mode.
2.3.6 (2011-08-18)
------------------
Features:
- Certain HTML attribute names now have a special behavior for a
attribute value of ``True`` (or ``default`` if no default is
defined). For these attributes, this return value will result in the
name being printed as the value::
<input type="input" tal:attributes="checked True" />
will be rendered as::
<input type="input" checked="checked" />
This behavior is compatible with the reference implementation.
2.3.5 (2011-08-18)
------------------
Features:
- Added support for the set operator (``{item, item, ...}``).
Bugfixes:
- If macro is defined on the same element as a translation name, this
no longer results in a "translation name not allowed outside
translation" error. This fixes issue #43.
- Attribute fallback to dictionary lookup now works on multiple items
(e.g. ``d1.d2.d2``). This fixes issue #42.
2.3.4 (2011-08-16)
------------------
Features:
- When inserting content in either attributes or text, a value of
``True`` (like ``False`` and ``None``) will result in no
action.
- Use statically assigned variables for ``"attrs"`` and
``"default"``. This change yields a performance improvement of
15-20%.
- The template loader class now accepts an optional argument
``default_extension`` which accepts a filename extension which will
be appended to the filename if there's not already an extension.
Bugfixes:
- The default symbol is now ``True`` for an attribute if the attribute
default is not provided. Note that the result is that the attribute
is dropped. This fixes issue #41.
- Fixed an issue where assignment to a variable ``"type"`` would
fail. This fixes issue #40.
- Fixed an issue where an (unsuccesful) assignment for a repeat loop
to a compiler internal name would not result in an error.
- If the translation function returns the identical object, manually
coerce it to string. This fixes a compatibility issue with
translation functions which do not convert non-string objects to a
string value, but simply return them unchanged.
2.3.3 (2011-08-15)
------------------
Features:
- The ``load:`` expression now passes the initial keyword arguments to
its template loader (e.g. ``auto_reload`` and ``encoding``).
- In the exception output, string variable values are now limited to a
limited output of characters, single line only.
Bugfixes:
- Fixed horizontal alignment of exception location info
(i.e. 'String:', 'Filename:' and 'Location:') such that they match
the template exception formatter.
2.3.2 (2011-08-11)
------------------
Bugfixes:
- Fixed issue where i18n:domain would not be inherited through macros
and slots. This fixes issue #37.
2.3.1 (2011-08-11)
------------------
Features:
- The ``Builtin`` node type may now be used to represent any Python
local or global name. This allows expression compilers to refer to
e.g. ``get`` or ``getitem``, or to explicit require a builtin object
such as one from the ``extra_builtins`` dictionary.
Bugfixes:
- Builtins which are not explicitly disallowed may now be redefined
and used as variables (e.g. ``nothing``).
- Fixed compiler issue with circular node annotation loop.
2.3 (2011-08-10)
----------------
Features:
- Added support for the following syntax to disable inline evaluation
in a comment:
<!--? comment appears verbatim (no ${...} evaluation) -->
Note that the initial question mark character (?) will be omitted
from output.
- The parser now accepts '<' and '>' in attributes. Note that this is
invalid markup. Previously, the '<' would not be accepted as a valid
attribute value, but this would result in an 'unexpected end tag'
error elsewhere. This fixes issue #38.
- The expression compiler now provides methods ``assign_text`` and
``assign_value`` such that a template engine might configure this
value conversion to support e.g. encoded strings.
Note that currently, the only client for the ``assign_text`` method
is the string expression type.
- Enable template loader for string-based template classes. Note that
the ``filename`` keyword argument may be provided on initialization
to identify the template source by filename. This fixes issue #36.
- Added ``extra_builtins`` option to the page template class. These
builtins are added to the default builtins dictionary at cook time
and may be provided at initialization using the ``extra_builtins``
keyword argument.
Bugfixes:
- If a translation domain is set for a fill slot, use this setting
instead of the macro template domain.
- The Python expression compiler now correctly decodes HTML entities
``'gt'`` and ``'lt'``. This fixes issue #32.
- The string expression compiler now correctly handles encoded text
(when support for encoded strings is enabled). This fixes issue #35.
- Fixed an issue where setting the ``filename`` attribute on a
file-based template would not automatically cause an invalidation.
- Exceptions raised by Chameleon can now be copied via
``copy.copy``. This fixes issue #36.
[leorochael]
- If copying the exception fails in the exception handler, simply
re-raise the original exception and log a warning.
2.2 (2011-07-28)
----------------
Features:
- Added new expression type ``load:`` that allows loading a
template. Both relative and absolute paths are supported. If the
path given is relative, then it will be resolved with respect to the
directory of the template.
- Added support for dynamic evaluation of expressions.
Note that this is to support legacy applications. It is not
currently wired into the provided template classes.
- Template classes now have a ``builtins`` attribute which may be used
to define built-in variables always available in the template
variable scope.
Incompatibilities:
- The file-based template class no longer accepts a parameter
``loader``. This parameter would be used to load a template from a
relative path, using a ``find(filename)`` method. This was however,
undocumented, and probably not very useful since we have the
``TemplateLoader`` mechanism already.
- The compiled template module now contains an ``initialize`` function
which takes values that map to the template builtins. The return
value of this function is a dictionary that contains the render
functions.
Bugfixes:
- The file-based template class no longer verifies the existance of a
template file (using ``os.lstat``). This now happens implicitly if
eager parsing is enabled, or otherwise when first needed (e.g. at
render time).
This is classified as a bug fix because the previous behavior was
probably not what you'd expect, especially if an application
initializes a lot of templates without needing to render them
immediately.
2.1.1 (2011-07-28)
------------------
Features:
- Improved exception display. The expression string is now shown in
the context of the original source (if available) with a marker
string indicating the location of the expression in the template
source.
Bugfixes:
- The ``structure`` insertion mode now correctly decodes entities for
any expression type (including ``string:``). This fixes issue #30.
- Don't show internal variables in the exception formatter variable
listing.
2.1 (2011-07-25)
----------------
Features:
- Expression interpolation (using the ``${...}`` operator and
previously also ``$identifier``) now requires braces everywhere
except inside the ``string:`` expression type.
This change is motivated by a number of legacy templates in which
the interpolation format without braces ``$identifier`` appears as
text.
2.0.2 (2011-07-25)
------------------
Bugfixes:
- Don't use dynamic variable scope for lambda-scoped variables (#27).
- Avoid duplication of exception class and message in traceback.
- Fixed issue where a ``metal:fill-slot`` would be ignored if a macro
was set to be used on the same element (#16).
2.0.1 (2011-07-23)
------------------
Bugfixes:
- Fixed issue where global variable definition from macro slots would
fail (they would instead be local). This also affects error
reporting from inside slots because this would be recorded
internally as a global.
- Fixed issue with template cache digest (used for filenames); modules
are now invalidated whenever any changes are made to the
distribution set available (packages on ``sys.path``).
- Fixed exception handler to better let exceptions propagate through
the renderer.
- The disk-based module compiler now mangles template source filenames
such that the output Python module is valid and at root level (dots
and hyphens are replaced by an underscore). This fixes issue #17.
- Fixed translations (i18n) on Python 2.5.
2.0 (2011-07-14)
----------------
- Point release.
2.0-rc14 (2011-07-13)
---------------------
Bugfixes:
- The tab character (``\t``) is now parsed correctly when used inside
tags.
Features:
- The ``RepeatDict`` class now works as a proxy behind a seperate
dictionary instance.
- Added template constructor option ``keep_body`` which is a flag
(also available as a class attribute) that controls whether to save
the template body input in the ``body`` attribute.
This is disabled by default, unless debug-mode is enabled.
- The page template loader class now accepts an optional ``formats``
argument which can be used to select an alternative template class.
2.0-rc13 (2011-07-07)
---------------------
Bugfixes:
- The backslash character (followed by optional whitespace and a line
break) was not correctly interpreted as a continuation for Python
expressions.
Features:
- The Python expression implementation is now more flexible for
external subclassing via a new ``parse`` method.
2.0-rc12 (2011-07-04)
---------------------
Bugfixes:
- Initial keyword arguments passed to a template now no longer "leak"
into the template variable space after a macro call.
- An unexpected end tag is now an unrecoverable error.
Features:
- Improve exception output.
2.0-rc11 (2011-05-26)
---------------------
Bugfixes:
- Fixed issue where variable names that begin with an underscore were
seemingly allowed, but their use resulted in a compiler error.
Features:
- Template variable names are now allowed to be prefixed with a single
underscore, but not two or more (reserved for internal use).
Examples of valid names::
item
ITEM
_item
camelCase
underscore_delimited
help
- Added support for Genshi's comment "drop" syntax::
<!--! This comment will be dropped -->
Note the additional exclamation (!) character.
This fixes addresses issue #10.
2.0-rc10 (2011-05-24)
---------------------
Bugfixes:
- The ``tal:attributes`` statement now correctly operates
case-insensitive. The attribute name given in the statement will
replace an existing attribute with the same name, without respect to
case.
Features:
- Added ``meta:interpolation`` statement to control expression
interpolation setting.
Strings that disable the setting: ``"off"`` and ``"false"``.
Strings that enable the setting: ``"on"`` and ``"true"``.
- Expression interpolation now works inside XML comments.
2.0-rc9 (2011-05-05)
--------------------
Features:
- Better debugging support for string decode and conversion. If a
naive join fails, each element in the output will now be attempted
coerced to unicode to try and trigger the failure near to the bad
string.
2.0-rc8 (2011-04-11)
--------------------
Bugfixes:
- If a macro defines two slots with the same name, a caller will now
fill both with a single usage.
- If a valid of ``None`` is provided as the translation function
argument, we now fall back to the class default.
2.0-rc7 (2011-03-29)
--------------------
Bugfixes:
- Fixed issue with Python 2.5 compatibility AST. This affected at
least PyPy 1.4.
Features:
- The ``auto_reload`` setting now defaults to the class value; the
base template class gives a default value of
``chameleon.config.AUTO_RELOAD``. This change allows a subclass to
provide a custom default value (such as an application-specific
debug mode setting).
2.0-rc6 (2011-03-19)
--------------------
Features:
- Added support for ``target_language`` keyword argument to render
method. If provided, the argument will be curried onto the
translation function.
Bugfixes:
- The HTML entities 'lt', 'gt' and 'quot' appearing inside content
subtition expressions are now translated into their native character
values. This fixes an issue where you could not dynamically create
elements using the ``structure`` (which is possible in ZPT). The
need to create such structure stems from the lack of an expression
interpolation operator in ZPT.
- Fixed duplicate file pointer issue with test suite (affected Windows
platforms only). This fixes issue #9.
[oliora]
- Use already open file using ``os.fdopen`` when trying to write out
the module source. This fixes LP #731803.
2.0-rc5 (2011-03-07)
--------------------
Bugfixes:
- Fixed a number of issues concerning the escaping of attribute
values:
1) Static attribute values are now included as they appear in the
source.
This means that invalid attribute values such as ``"true &&
false"`` are now left alone. It's not the job of the template
engine to correct such markup, at least not in the default mode
of operation.
2) The string expression compiler no longer unescapes
values. Instead, this is left to each expression
compiler. Currently only the Python expression compiler unescapes
its input.
3) The dynamic escape code sequence now correctly only replaces
ampersands that are part of an HTML escape format.
Imports:
- The page template classes and the loader class can now be imported
directly from the ``chameleon`` module.
Features:
- If a custom template loader is not provided, relative paths are now
resolved using ``os.abspath`` (i.e. to the current working
directory).
- Absolute paths are normalized using ``os.path.normpath`` and
``os.path.expanduser``. This ensures that all paths are kept in
their "canonical" form.
2.0-rc4 (2011-03-03)
--------------------
Bugfixes:
- Fixed an issue where the output of an end-to-end string expression
would raise an exception if the expression evaluated to ``None`` (it
should simply output nothing).
- The ``convert`` function (which is configurable on the template
class level) now defaults to the ``translate`` function (at
run-time).
This fixes an issue where message objects were not translated (and
thus converted to a string) using the a provided ``translate``
function.
- Fixed string interpolation issue where an expression immediately
succeeded by a right curly bracket would not parse.
This fixes issue #5.
- Fixed error where ``tal:condition`` would be evaluated after
``tal:repeat``.
Features:
- Python expression is now a TALES expression. That means that the
pipe operator can be used to chain two or more expressions in a
try-except sequence.
This behavior was ported from the 1.x series. Note that while it's
still possible to use the pipe character ("|") in an expression, it
must now be escaped.
- The template cache can now be shared by multiple processes.
2.0-rc3 (2011-03-02)
--------------------
Bugfixes:
- Fixed ``atexit`` handler.
This fixes issue #3.
- If a cache directory is specified, it will now be used even when not
in debug mode.
- Allow "comment" attribute in the TAL namespace.
This fixes an issue in the sense that the reference engine allows
any attribute within the TAL namespace. However, only "comment" is
in common use.
- The template constructor now accepts a flag ``debug`` which puts the
template *instance* into debug-mode regardless of the global
setting.
This fixes issue #1.
Features:
- Added exception handler for exceptions raised while evaluating an
expression.
This handler raises (or attempts to) a new exception of the type
``RenderError``, with an additional base class of the original
exception class. The string value of the exception is a formatted
error message which includes the expression that caused the
exception.
If we are unable to create the exception class, the original
exception is re-raised.
2.0-rc2 (2011-02-28)
--------------------
- Fixed upload issue.
2.0-rc1 (2011-02-28)
--------------------
- Initial public release. See documentation for what's new in this
series.
Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Developers
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 2.5
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3.1
Classifier: Programming Language :: Python :: 3.2
|