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Data structures for the CSS abstract syntax tree.
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S )Nodea Every node type inherits from this class,
which is never instantiated directly.
.. attribute:: type
Each child class has a :attr:`type` class attribute
with a unique string value.
This allows checking for the node type with code like:
.. code-block:: python
if node.type == 'whitespace':
instead of the more verbose:
.. code-block:: python
from tinycss2.ast import WhitespaceToken
if isinstance(node, WhitespaceToken):
Every node also has these attributes and methods,
which are not repeated for brevity:
.. attribute:: source_line
The line number of the start of the node in the CSS source.
Starts at 1.
.. attribute:: source_column
The column number within :attr:`source_line` of the start of the node
in the CSS source.
Starts at 1.
.. automethod:: serialize
source_line
source_columnc C s || _ || _d S )N)r r )selfr r r 0/tmp/pip-build-_d5lkt3n/tinycss2/tinycss2/ast.py__init__5 s z
Node.__init__c C s | j j| djdS )N)r
utf8) repr_formatformatencode)r
r r r __repr__: s z
Node.__repr__c C s | j j| dS )N)r
)r r )r
r r r r = s c C s g }| j |j dj|S )z>Serialize this node to CSS syntax and return a Unicode string. )r appendjoin)r
chunksr r r serialize@ s zNode.serializec C s t dS )zSerialize this node to CSS syntax, writing chunks as Unicode string
by calling the provided :obj:`write` callback.
N)NotImplementedError)r
writer r r r F s zNode._serialize_toN) __name__
__module__ __qualname____doc__ __slots__r
strbytesr r r r r r r r
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S )
ParseErrora A syntax error of some sort. May occur anywhere in the tree.
Syntax errors are not fatal in the parser
to allow for different error handling behaviors.
For example, an error in a Selector list makes the whole rule invalid,
but an error in a Media Query list only replaces one comma-separated query
with ``not all``.
.. autoattribute:: type
.. attribute:: kind
Machine-readable string indicating the type of error.
Example: ``'bad-url'``.
.. attribute:: message
Human-readable explanation of the error, as a string.
Could be translated, expanded to include details, etc.
kindmessageerrorz'<{self.__class__.__name__} {self.kind}>c C s t j| || || _|| _d S )N)r r
r" r# )r
linecolumnr" r# r r r r
h s zParseError.__init__c C sZ | j dkr|d nB| j dkr(|d n.| j dkr>|| j n| j d krJn td| d S )
Nz
bad-stringz"[bad string]
zbad-urlzurl([bad url])z)]}
eof-in-string
eof-in-urlzCan not serialize %r)r' r( )r" TypeError)r
r r r r r m s
zParseError._serialize_toN) r r r r r typer r
r r r r r r! N s r! c @ s. e Zd ZdZdgZdZdZdd Zdd Zd S )
Commenta A CSS comment.
Comments can be ignored by passing ``skip_comments=True``
to functions such as :func:`~tinycss2.parse_component_value_list`.
.. autoattribute:: type
.. attribute:: value
The content of the comment, between ``/*`` and ``*/``, as a string.
valuecommentz(<{self.__class__.__name__} {self.value}>c C s t j| || || _d S )N)r r
r, )r
r% r& r, r r r r
s zComment.__init__c C s |d || j |d d S )Nz/*z*/)r, )r
r r r r r s
zComment._serialize_toN) r r r r r r* r r
r r r r r r+ z s r+ c @ s. e Zd ZdZdgZdZdZdd Zdd Zd S )
WhitespaceTokenzA :diagram:`whitespace-token`.
.. autoattribute:: type
.. attribute:: value
The whitespace sequence, as a string, as in the original CSS source.
r,
whitespacez<{self.__class__.__name__}>c C s t j| || || _d S )N)r r
r, )r
r% r& r, r r r r
s zWhitespaceToken.__init__c C s || j d S )N)r, )r
r r r r r s z WhitespaceToken._serialize_toN) r r r r r r* r r
r r r r r r. s
r. c @ s> e Zd ZdZdgZdZdZdd Zdd Zd d
Z d d Z
d
S ) LiteralTokena Token that represents one or more characters as in the CSS source.
.. autoattribute:: type
.. attribute:: value
A string of one to four characters.
Instances compare equal to their :attr:`value`,
so that these are equivalent:
.. code-block:: python
if node == ';':
if node.type == 'literal' and node.value == ';':
This regroups what `the specification`_ defines as separate token types:
.. _the specification: https://drafts.csswg.org/css-syntax-3/
* ** ``:``
* ** ``;``
* ** ``,``
* ** ``-->``
* ** ``