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.. module:: classytags.arguments

This module contains standard argument types.

A basic single value argument with name as it's name.

default is used if required is False and this argument is not given.

If resolve is False, the argument will not try to resolve it's contents against the context. This is especially useful for 'as varname' arguments. Note that quotation marks around the argument will be removed if there are any.

.. attribute:: value_class

    The class to be used to wrap the value in. Defaults to

.. method:: get_default()

    Returns the default value for this argument

.. method:: parse(parser, token, tagname, kwargs)

    Parses a single *token* into *kwargs*. Should return ``True`` if it
    consumed this token or ``False`` if it didn't.

.. method:: parse_token(parser, token)

    Parses a single *token* using *parser* into an object which is can be
    resolved against a context. Usually this is a template variable, a
    filter expression or a :class:`classytags.utils.TemplateConstant`.

Same as :class:`classytags.arguments.Argument` but with :class:`classytags.values.StrictStringValue` as :attr:`value_class`.

Same as :class:`classytags.arguments.Argument` but with :class:`classytags.values.IntegerValue` as :attr:`value_class`.


.. module:: classytags.blocks

This module contains classes for :ref:`advanced-block-definition`.

A block definition with the given alias and a sequence of names. The members of the names sequence must either be strings, :class:`classytags.blocks.VariableBlockName` instances or other objects implementing at least a :meth:`collect` method compatible with the one of :class:`classytags.blocks.VariableBlockName`.

.. attribute:: alias

    The alias for this definition to be used in the tag's kwargs.

.. attribute:: names

    Sequence of strings or block name definitions.

.. method:: validate(options)

    Validates this definition against an instance of
    :class:`classytags.core.Options` by calling the :meth:`validate` on all
    it's :attr:`names` if such a method is available.

.. method:: collect(parser)

    Returns a sequence of strings to be used in the ``parse_until``
    statement. This is a sequence of strings that this block accepts to be
    handled. The parser argument is an instance of

A block name definition to be used in :class:`classytags.blocks.BlockDefinition` to implement block names that depend on the (unresolved) value of an argument. The template argument to this class should be a string with the value string substitution placeholder. For example: 'end_my_block %(value)s'. The argname argument is the name of the argument from which the value should be extracted.

.. method:: validate(options)

    Validates that the given argname is actually available on the tag.

.. method:: collect(parser)

    Returns the template substitued with the value extracted from the tag.


.. module:: classytags.core

This module contains the core objects to create tags.

Holds the options of a tag. options should be a sequence of :class:`classytags.arguments.Argument` subclasses or strings (for breakpoints). You can give they keyword argument blocks to define a list of blocks to parse until. You can specify a custom argument parser by providing the keyword argument parser_class.

.. attribute:: all_argument_names

    A list of all argument names in this tag options.
    Used by :class:`classytags.blocks.VariableBlockName` to validate it's

.. method:: get_parser_class()

    Returns :class:`classytags.parser.Parser` or a subclass of it.

.. method:: bootstrap()

    An internal method to bootstrap the arguments. Returns an instance of

.. method:: parse(parser, token):

    An internal method to parse the template tag. Returns a tuple
    ``(arguments, blocks)``.

The metaclass of :class:`classytags.core.Tag` which ensures the tag has a name attribute by setting one based on the classes name if none is provided.

The Tag class is nothing other than a subclass of :class:`django.template.Node` which handles argument parsing in it's :meth:`__init__` method rather than an external function. In a normal use case you should only override :attr:`name`, :attr:`options` and :meth:`render_tag`.


When registering your template tag, register the class object, not an instance of it.

.. attribute:: name

    The name of this tag (for use in templates). This attribute is optional
    and if not provided, the un-camelcase class name will be used instead.
    So MyTag becomes my_tag.

.. attribute:: options

    An instance of :class:`classytags.core.Options` which holds the
    options of this tag.

.. method:: __init__(parser, token):

    .. warning::

        This is an internal method. It is only documented here for those
        who would like to extend django-classy-tags.

    This is where the arguments to this tag get parsed. It's the equivalent
    to a *compile function* in Django's standard templating system.
    This method does nothing else but assing the :attr:`kwargs` and
    :attr:`blocks` attributes to the output of :meth:`options.parse` with
    the given *parser* and *token*.

.. method:: render(context)

    .. warning::

        This is an internal method. It is only documented here for those
        who would like to extend django-classy-tags.

    This method resolves the arguments to this tag against the context and
    then calls :meth:`render_tag` with the context and those arguments and
    returns the return value of that method.

.. method:: render_tag(context[, **kwargs])

    The method used to render this tag for a given context. *kwargs* is a
    dictionary of the (already resolved) options of this tag as well as the
    blocks (as nodelists) this tag parses until if any are given.
    This method should return a string.


.. module:: classytags.exceptions

This module contains the custom exceptions used by django-classy-tags.

.. exception:: BaseError

    The base class for all custom excpetions, should never be raised directly.

.. exception:: ArgumentRequiredError(argument, tagname)

    Gets raised if an option of a tag is required but not provided.

.. exception:: InvalidFlag(argname, actual_value, allowed_values, tagname)

    Gets raised if a given value for a flag option is neither in *true_values*
    nor *false_values*.

.. exception:: BreakpointExpected(tagname, breakpoints, got)

    Gets raised if a breakpoint was expected, but another argument was found.

.. exception:: TooManyArguments(tagname, extra)

    Gets raised if too many arguments are provided for a tag.


.. module:: classytags.helpers

This modules contains helper classes to make building template tags even easier.

A helper tag base class to build 'as varname' tags. Note that the option class still has to contain the 'as varname' information. This tag will use the last argument in the options class to set the value into the context.

This class implements the method :meth:`classytags.helpers.AsTag.get_value` which gets the context and all arguments except for the varname argument as arguments. It should always return the value this tag comes up with, the class then takes care of either putting the value into the context or returns it if the varname argument is not provided.


You should not override the :meth:`render_tag` method of this class.

.. method:: get_value_for_context(context, **kwargs):

    .. versionadded:: 0.5

    Should return the value of this tag if used in the 'as varname' form.
    By default this method just calls ``get_value`` and returns that.

    You may want to use this method if you want to suppress exceptions in
    the 'as varname' case.

.. method:: get_value(context, **kwargs)

    Should return the value of this tag. The context setting is done in the
    :meth:`classytags.core.Tag.render_tag` method of this class.

A helper class for writing inclusion tags (template tags which render a template).


You should not override the :meth:`render_tag` method of this class.

.. attribute:: template

    The template to use if :meth:`get_template` is not overridden.

.. attribute:: push_context

    .. versionadded:: 0.5.2

    By default, this is ``False``. If it's set to ``True`` the context will
    be pushed before rendering the included template, preventing context

.. method:: get_template(context, **kwargs)

    This method should return a template (path) for this context and
    arguments. By default returns the value of :attr:`template`.

.. method:: get_context(context, **kwargs)

    Should return the context (as a dictionary or an instance of
    :class:`django.template.Context` or a subclass of it) to use to render
    the template. By default returns an empty dictionary.


.. module:: classytags.parser

The default argument parser lies here.

The default argument parser class. It get's initialized with an instance of :class:`classytags.utils.StructuredOptions`.

.. attribute:: options

    The :class:`classytags.utils.StructuredOptions` instance given when the
    parser was instantiated.

.. attribute:: parser

    The (template) parser used to parse this tag.

.. attribute:: bits

    The split tokens.

.. attribute:: tagname

    Name of this tag.

.. attribute:: kwargs

    The data extracted from the bits.

.. attribute:: blocks

    A dictionary holding the block nodelists.

.. attribute:: arguments

    The arguments in the current breakpoint scope.

.. attribute:: current_argument

    The current argument if any.

.. attribute:: todo

    Remaining bits. Used for more helpful exception messages.

.. method:: parse(parser, token)

    Parses a token stream. This is called when your template tag is parsed.

.. method:: handle_bit(bit)

    Handle the current bit (token).

.. method:: handle_next_breakpoint(bit)

    The current bit is the next breakpoint. Make sure the current scope can be
    finished successfully and shift to the next one.

.. method:: handle_breakpoints(bit)

    The current bit is a future breakpoint, try to close all breakpoint scopes
    before that breakpoint and shift to it.

.. method:: handle_argument(bit)

    The current bit is an argument. Handle it and contribute to

.. method:: parse_blocks()

    Parses the blocks this tag wants to parse until if any are provided.

.. method:: finish()

    After all bits have been parsed, finish all remaining breakpoint scopes.

.. method:: check_required()

    A helper method to check if there's any required arguments left in the
    current breakpoint scope. Raises a
    :exc:`classytags.exceptions.ArgumentRequiredError` if one is found and
    contributes all optional arguments to :attr:`kwargs`.


.. module:: classytags.utils

Utility classes and methods for django-classy-tags.

A pseudo type.

A constant pseudo template variable which always returns it's initial value when resolved.

.. attribute:: literal

    Used by the :class:`classytags.blocks.VariableBlockName` to generate
    it's final name.

A helper class to organize options.

.. attribute:: options

    The arguments in this options.

.. attribute:: breakpoints

    A *copy* of the breakpoints in this options

.. attribute:: blocks

    A *copy* of the list of tuples (blockname, alias) of blocks of this tag.

.. attribute:: current_breakpoint

    The current breakpoint.

.. attribute:: next_breakpoint

    The next breakpoint (if there is any).

.. method:: shift_breakpoint()

    Shift to the next breakpoint and update :attr:`current_breakpoint` and

.. method:: get_arguments()

    Returns a copy of the arguments in the current breakpoint scope.

A subclass of list which resolves all it's items against a context when it's resolve method gets called.

.. function:: get_default_name(name)

    Turns 'CamelCase' into 'camel_case'.


.. module:: classytags.values

.. attribute:: errors

    A dictionary holding error messages which can be caused by this value
    class. Defaults to an empty dictionary.

.. attribute:: value_on_error

    The value to use when the validation of a input value fails in non-debug
    mode. Defaults to an empty string.

.. attribute:: var

    The variable wrapped by this value instance.

.. method:: resolve(context)

    Resolve :attr:`var` against *context* and validate it by calling the
    :meth:`clean` method with the resolved value.

.. method:: clean(value)

    Validates and/or cleans a resolved value. This method should always
    return something. If validation fails, the :meth:`error` helper method
    should be used to properly handle debug modes.

.. method:: error(value, category)

    Handles an error in *category* caused by *value*. In debug mode this
    will cause a :exc:`django.template.TemplateSyntaxError` to be raised,
    otherwise a `TemplateSyntaxWarning` is called and
    :attr:`value_on_error` is returned.
    The message to be used for both the exception and the warning will be
    constructed by the message in :attr:`errors` if *category* is in it. The
    value can be used as a named string formatting parameter.

Same as :class:`StringValue` but enforces that the value passed to it is a string (instance of basestring).

Subclass of :class:`StringValue`.

.. method:: clean(value)

    Tries to convert the value to an integer.

Subclass of :class:`StringValue` and :class:`list`.

Appends the initial value to itself in initialization.

.. method:: resolve(context)

    Resolves all items in itself against *context* and calls :meth:`clean`
    with the list of resolved values.

Subclass of :class:`StringValue` and :class:`dict`.

.. method:: resolve(context)

    Resolves all *values* against *context* and calls :meth:`clean` with the
    resolved dictionary.
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