Fast HTML/XML Template Compiler.
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 application with just about any
version of Python (3.8+ and up, plus pypy 3 <http://pypy.org>
_).
Visit the documentation <https://chameleon.readthedocs.io/en/latest/>
_
for more information.
This software is made available as-is under a BSD-like license [1]_ (see included copyright notice).
.. [1] This software is licensed under the Repoze <http://repoze.org/license.html>
_ license.
Remove zope.interface
.
Fix an issue where auto_reload
is enabled and a file is loaded
from a package that wasn't zip-compressed.
(#402 <https://github.com/malthe/chameleon/issues/402>
_)
Add optional parameter package_name
which allows loading a
template relative to a package.
Drop support for Python 3.7.
Fix regression where Chameleon would not load templates correctly on Windows.
Fix names of dependencies for importlib_resources
and
importlib_metadata
.
(#394 <https://github.com/malthe/chameleon/pull/394>
_)
Local variable scope is now iterable, completing dict interface.
(#390 <https://github.com/malthe/chameleon/pull/390>
_)
Minor optimizations to rendering logic.
Implicit translation now provides the translation context, domain,
and target language to the translation function (if applicable). Previously,
the target language was provided, but this did not respect a change via
i18n:target
.
(#369 <https://github.com/malthe/chameleon/issues/369>
_)
Replace pkg_resources
with newer and faster importlib.resources
and
importlib.metadata
. Just importing pkg_resources
becomes slower and
slower the more packages are installed.
An XML document provided as a string (i.e. decoded) now correctly has its content encoding parsed.
Boolean attributes are now automatically configured for templates in non-XML mode, presuming that we're being used to generate HTML.
This means that the same loading mechanism can be used for both XML- and HTML-based templates.
Boolean attributes (those configured using the optional
boolean_attributes
parameter) now work with $-expression
interpolation.
Unlike content and regular attributes, a special check for a falsy value is now done for boolean attributes, such that boolean logic can be used for interpolation expressions (only a truthy value will include the attribute).
This reverts a change in behavior introduced in 3.8.0.
Additionally, dynamic attributes now respect the boolean attributes configuration as well.
#376 <https://github.com/malthe/chameleon/issues/376>
_)Drop support for Python 2.7, 3.5, 3.6.
Add support for set- and dict comprehensions
(#367 <https://github.com/malthe/chameleon/issues/367>
_)
Remove the following functions resp. modules:
.utils.text_()
.utils.unescape()
.compat
#356 <https://github.com/malthe/chameleon/issues/356>
_)Make scope class dict-like
(#305 <https://github.com/malthe/chameleon/issues/305>
_)
Work in FIPS enabled environments
(#345 <https://github.com/malthe/chameleon/issues/345>
_)
Fix tab handling issue
(#350 <https://github.com/malthe/chameleon/issues/350>
_)
Removed compatibility code for unsupported Python versions
Dropped support for obsolete Python 3.4
Fixed namespace handling when redefining a variable in the same tal:define
(#237 <https://github.com/malthe/chameleon/issues/237>
_)
Fixed failure computing a template's digest if template.filename
is None
(#254 <https://github.com/malthe/chameleon/issues/254>
_)
Added code optimization to reduce sequential appends of static text.
The default
symbol in dynamic attributes is now
symbolic. Previously, it was assigned the string value of the
default attribute text. A similar change has been made for
switch/case expressions.
The built-in attrs
dictionary of static element attributes now
correctly works with tal:define
, etc.
Fix slice code generation compatibility issue on Python 3.9.
Expose default marker as importable symbol
chameleon.tales.DEFAULT_MARKER
.
Removed legacy flag literal_false
. To get a similar behavior, use
boolean_attributes
.
Fixed garbage collection issue with variable scope objects (issue #301).
Fixed issue where setting a global variable would not be available locally.
A RepeatDict
no longer inherits from dict
since it does not
actually provide that interface in a meaningful way.
Added feature gate enable_comment_interpolation
which controls
whether expression interpolation is enabled inside HTML comments
(default is enabled).
Added support for Python 3.6+ f-strings (issue #294).
Exclude RuntimeError
(or RecursionError
when available) from
exception wrapping.
Fix double dollar '$$' escaping such that a double dollar is always resolved, either as an interpolation expression, or as an escape where it is substituted by a single dollar symbol. This is now consistent with Zope's handling of this character.
Backslash-escaping of dollar-based string interpolation is no longer supported. The documentation has been updated to reflect this change.
This fixes issue #283. Note that this reverses some of the changes introduced to fix issue #265.
Drop support for Python 3.3.
Add support for Python 3.8.
Add support for TAL attributes in an XML declaration tag. This fixes issue #269.
Add support for custom exception handling for the tal:on-error
statement. There is now an option on_error_handler
available
as a template configuration (issue #266).
Fix issue where double '$$' escaping would affect non-interpolation expressions such as the bare '$$' (issue #265).
Fix an issue where backslash dollar escaping would leave the backslash character still in place.
Bugfixes:
Bugfixes:
Reset error token when rendering internal macro calls.
Fix edge case in exception handler causing recursion. [MatthewWilkes]
Features:
Add the automatic variable macroname
that's bound to the name of
the executing macro. Fixes https://github.com/malthe/chameleon/issues/238
A tokenizer can now be configured on the template class. This is useful in the case where the template file input is modified before parsing (for example, where some tags are stripped away) such that token positions need to be offset accordingly for error locations to be rendered correctly.
Expression errors now display source marker (previously only filename, line and column was shown).
No longer require Python source files to import modules. [mrh1997]
Optimizations:
Features:
restricted_namespace
which controls whether to
restrict namespaces to those defined and used by the page template
language.
[hansroh]Bugs:
&
would be encoded twice.Optimizations:
Simplify exception tracking, reducing bytecode size significantly.
Avoid checking if a static string is None
during expression
interpolation.
Bugs:
Fix issue on Python 2 where an exception was not cleared when using
the pipe operator and was thus accessible through sys.exc_info()
.
The "exists" expression no longer leaks error information.
Escape '$$' into '$' in both content and string expressions.
Fix use of macro definition inside translation block.
Improvements:
Allow unquoted attribute values.
Wrap attribute error thrown when trying to use a non-macro as a
macro as a RenderError
to get proper error output.
Throw a parse error if '--' (double hyphen) appears in an XML comment.
The i18n:target
attribute now overrides a default
target_language
variable and is passed to the translation
function.
Include filename in the on-disk cache module name. Previously, only the SHA digest in hex representation would be used, making it difficult to see where the module came from. This fixes issue #132.
Add support for non-ascii attribute names. [sank]
Compatibility:
Add explicit support / testing for Python 3.5.
Add \r
to negative regex matches to the chameleon parser, where \n
is used but \r
was missing.
Fixes a case, where the tag name was parsed into html\r
instead of html
.
Fixes: https://github.com/malthe/chameleon/issues/219
Fixed Python 3.5 compatibility.
Fixed brown bag release.
enable_data_attributes
option that allows using HTML5 data
attributes as control attributes instead or in addition to XML
namespace attributes.Added RenderError
exception which indicates that an error
occurred during the evaluation of an expression.
Clean up TemplateError
exception implementation.
search_path
to template class when loaded using
TemplateLoader
(or one of the derived classes).
[faassen]Fix logging deprecation.
Fix environment-based configuration logging error.
Add support for i18n:context
.
[wiggy]
Add missing 'parity' repeat property. [voxspox]
Don't modify environment when getting variables from it. [fschulze]
If a repeat expression evaluates to None
then it is now
equivalent to an empty set.
This changes a behavior introduced in 2.14.
This fixes issue #172.
Remove fossil test dependency on deprecated distribute
.
Add explicit support / testing for Python 3.3 / 3.4.
Drop explicit support for Python 2.5 (out of maintenance, and no longer
supported by tox
or Travis-CI
).
NameConstant
.
[brakhane]Element repetition using the TAL
namespace no longer includes
whitespace. This fixes issue #110.
Use absolute import for chameleon.interfaces
module. This fixes
issue #161.
Bugfixes:
The template cache mechanism now includes additional configuration
settings as part of the cache key such as strict
and
trim_attribute_space
.
[ossmkitty]
Fix cache issue where sometimes cached templates would not load correctly. [ossmkitty]
In debug-mode, correctly remove temporary files when the module
loader is garbage-collected (on __del__
).
[graffic]
Fix error message when duplicate i18n:name directives are used in a translation.
Using the three-argument form of getattr
on a
chameleon.tal.RepeatDict
no longer raises KeyError
,
letting the default provided to getattr
be used. This fixes
attempting to adapt a RepeatDict
to a Zope interface under
PyPy.
Changes:
tal:case
condition succeeds, no other case now will.Bugfixes:
Implicit translation now correctly extracts and normalizes complete sentences, instead of words. [witsch]
The default
symbol in a tal:case
condition now allows the
element only if no other case succeeds.
Bugfixes:
An issue was resolved where a METAL statement was combined with a
tal:on-error
handler.
Fix minor parser issue with incorrectly formatted processing instructions.
Provide proper error handling for Python inline code blocks.
Features:
translationstring
interface.Optimizations:
Deprecations:
The fast_translate
function has been deprecated. Instead, the
default translation function is now always a function that simply
interpolates the mapping onto the message default or id.
The motivation is that since version 2.9, the context
argument
is non-trivial: the econtext
mapping is passed. This breaks an
expectation on the Zope platform that the context
parameter is
the HTTP request. Previously, with Chameleon this parameter was
simply not provided and so that did not cause issues as such.
The ast24
module has been renamed to ast25
. This should help
clear up any confusion that Chameleon 2.x might be support a Python
interpreter less than version 2.5 (it does not).
Features:
The ProxyExpr
expression class (and hence the load:
expression type) is now a TALES-expression. In practical terms, this
means that the expression type (which computes a string result using
the standard "${...}"
interpolation syntax and proxies the
result through a function) now supports fallback using the pipe
operator ("|"
). This fixes issue #128.
An attempt to interpolate using the empty string as the expression
(i.e. ${}
) now does nothing: the string ${}
is simply output
as is.
Added support for adding, modifying, and removing attributes using a
dictionary expression in tal:attributes
(analogous to Genshi's
py:attrs
directive)::
In the example above, name
is an identifier, while value
and
attrs
are Python expressions. However, attrs
must evaluate
to a Python dictionary object (more concisely, the value must
implement the dictionary API-methods update()
and items()
).
Optimizations:
Bugfixes:
An exception is now raised if a trivial string is passed for
metal:fill-slot
. This fixes issue #89.
An empty string is now never translated. Not really a bug, but it's been reported in as an issue (#92) because some translation frameworks handle this case incorrectly.
The template module loader (file cache) now correctly encodes generated template source code as UTF-8. This fixes issue #125.
Fixed issue where a closure might be reused unsafely in nested template rendering.
Fixed markup class __repr__
method. This fixes issue #124.
Added missing return statement to fix printing the non-abbreviated filename in case of an exception. [tomo]
Bugfixes:
Fixed a PyPy incompatibility.
Fixed issue #109 which caused testing failures on some platforms.
Bugfixes:
Fixed issue #103. The tal:on-error
statement now always adds an
explicit end-tag to the element, even with a substitution content of
nothing.
Fixed issue #113. The tal:on-error
statement now works correctly
also for dynamic attributes. That is, the fallback tag now includes
only static attributes.
Fixed name error which prevented the benchmark from running correctly.
Compatibility:
Features:
econtext
argument as the
value for context
. Note that historically, this was usually an
HTTP request which might provide language negotiation data through a
dictionary interface.
[alvinyue]Bugfixes:
Bugfixes:
Fixed minor installation issues on Python 2.5 and 3. [ppaez]
Ensure output is unicode even when trivial (an empty string).
Features:
Bugfixes:
Include filename and location in exception output for exceptions raised during compilation.
If a trivial translation substitution variable is given (i.e. an empty string), simply ignore it. This fixes issue #106.
Features:
Log template source on debug-level before cooking.
The target_language
argument, if given, is now available as a
variable in templates.
Features:
Bugfixes:
The index
, start
and end
methods on the TAL repeat object are
now callable. This fixes an incompatibility with ZPT.
The loader now correctly handles absolute paths on Windows. [rdale]
Features:
Bugfixes:
The exception formatter now correctly recognizes nested errors and does not rewrap the dynamically generated exception class.
The exception formatter now correctly sets the __module__
attribute to that of the original exception class.
Features:
Added support for code blocks using the <?python ... ?>
processing
instruction syntax.
The scope is name assignments is up until the nearest macro definition, or the template itself if macros are not used.
Bugfixes:
Fall back to the exception class' __new__
method to safely
create an exception object that is not implemented in Python.
The exception formatter now keeps track of already formatted exceptions, and ignores them from further output.
__init__
method of
BaseException
instead of the possibly overridden method (which
may take required arguments). This fixes issue #97.
[j23d, malthe]Bugfixes:
Features:
trim_attribute_space
that decides whether attribute
whitespace is stripped (at most down to a single space). This option
exists to provide compatibility with the reference
implementation. Fixes issue #85.Bugfixes:
Ignore unhashable builtins when generating a reverse builtin map to quickly look up a builtin value. [malthe]
Apply translation mapping even when a translation function is not available. This fixes issue #83. [malthe]
Fixed issue #80. The translation domain for a slot is defined by the
source document, i.e. the template providing the content for a slot
whether it be the default or provided through metal:fill-slot
.
[jcbrand]
In certain circumstances, a Unicode non-breaking space character would cause a define clause to fail to parse.
Features:
Enable expression interpolation in CDATA.
The page template class now implements dictionary access to macros::
template[name]
This is a short-hand for::
template.macros[name]
Bugfixes:
An invalid define clause would be silently ignored; we now raise a language error exception. This fixes issue #79.
Fixed regression where ${...}
interpolation expressions could
not span multiple lines. This fixes issue #77.
Features:
The load:
expression now derives from the string expression such
that the ${...}
operator can be used for expression
interpolation.
The load:
expression now accepts asset specs; these are resolved
by the pkg_resources.resource_filename
function::
<package_name>:
An example from the test suite::
chameleon:tests/inputs/hello_world.pt
Bugfixes:
i18n:translate
statement). This addresses
issue #76.Bugfixes:
Fixed issue where tal:on-error
would not respect
tal:omit-tag
or namespace elements which are omitted by default
(such as <tal:block />
).
Fixed issue where macros
attribute would not be available on
file-based templates due to incorrect initialization.
The TryExcept
and TryFinally
AST nodes are not available on
Python 3.3. These have been aliased to Try
. This fixes issue
#75.
Features:
The TAL repeat item now makes a security declaration that grants access to unprotected subobjects on the Zope 2 platform::
allow_access_to_unprotected_subobjects = True
This is required for legacy compatibility and does not affect other environments.
The template object now has a method write(body)
which
explicitly decodes and cooks a string input.
Added configuration option loader_class
which sets the class
used to create the template loader object.
The class (essentially a callable) is created at template construction time.
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.
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.
Bugfixes:
Bugfixes:
Features:
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.
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.::
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.
Bugfixes:
The tal:on-error
statement should catch all exceptions.
Fixed issue that would prevent escaping of interpolation expression values appearing in text.
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.
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.
Features:
Bugfixes:
Bugfixes:
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.
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.
Features:
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.
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::
will be rendered as::
This behavior is compatible with the reference implementation.
Features:
{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.
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 (unsuccessful) 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.
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:
Bugfixes:
Features:
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.
Features:
Added support for the following syntax to disable inline evaluation in a comment:
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.
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 existence 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.
Features:
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.
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.
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).
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.
Bugfixes:
\t
) is now parsed correctly when used inside
tags.Features:
The RepeatDict
class now works as a proxy behind a separate
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.
Bugfixes:
Features:
parse
method.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:
Bugfixes:
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::
Note the additional exclamation (!) character.
This fixes addresses issue #10.
Bugfixes:
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.
Features:
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.
Bugfixes:
Features:
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).Features:
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.
Bugfixes:
Fixed a number of issues concerning the escaping of attribute values:
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.
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.
The dynamic escape code sequence now correctly only replaces ampersands that are part of an HTML escape format.
Imports:
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.
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.
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.