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ast
~~~
The `ast` module helps Python applications to process trees of the Python
abstract syntax grammar. The abstract syntax itself might change with
each Python release; this module helps to find out programmatically what
the current grammar looks like and allows modifications of it.
An abstract syntax tree can be generated by passing `ast.PyCF_ONLY_AST` as
a flag to the `compile()` builtin function or by using the `parse()`
function from this module. The result will be a tree of objects whose
classes all inherit from `ast.AST`.
A modified abstract syntax tree can be compiled into a Python code object
using the built-in `compile()` function.
Additionally various helper functions are provided that make working with
the trees simpler. The main intention of the helper functions and this
module in general is to provide an easy to use interface for libraries
that work tightly with the python syntax (template engines for example).
:copyright: Copyright 2008 by Armin Ronacher.
:license: Python License.
N)*)contextmanager nullcontext)IntEnumauto execF)
type_commentsfeature_versionc C sR t }|r|tO }t|tr4|\}}|dks.J |}n |du r@d}t| ||||dS )z
Parse the source into an AST node.
Equivalent to compile(source, filename, mode, PyCF_ONLY_AST).
Pass type_comments=True to get back type comments where the syntax allows.
N)_feature_version)Z
PyCF_ONLY_ASTZPyCF_TYPE_COMMENTS
isinstancetuplecompile)sourcefilenamemoder r
flagsmajorminor r /usr/lib64/python3.9/ast.pyparse! s
r c s` t | trt| dd} t | tr&| j} dd fddfdd fd d
| S ) aT
Evaluate an expression node or a string containing only a Python
expression. The string or node provided may only consist of the following
Python literal structures: strings, bytes, numbers, tuples, lists, dicts,
sets, booleans, and None.
Caution: A complex expression can overflow the C stack and cause a crash.
evalr c S s t d| d S )Nzmalformed node or string: )
ValueErrornoder r r _raise_malformed_nodeC s z+literal_eval.._raise_malformed_nodec s, t | tr t| jtttfvr& | | jS N)r Constanttypevalueintfloatcomplexr )r r r _convert_numE s z"literal_eval.._convert_numc sD t | tr._convert_signed_numc sZ t | tr| jS t | tr*tt | jS t | trDtt | jS t | t r^t
t | jS t | t rt | j t
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S t | trt| jt| jkrȈ| ttt | jt | jS t | trRt | jttfrR| j}| j }t |t t frRt |t rRt | jtrJ|| S || S | S )Nset) r r! r# Tupler mapeltsListlistSetr- ZCallfuncNameidargskeywordsDictlenkeysvaluesdictzipZBinOpr( AddSubleftrightr$ r% r& )r rA rB _convertr' r, r r r rD Q s<
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rG T)indentc sT d fdd t | ts.td| jj durHt tsHd | d S )a
Return a formatted dump of the tree in node. This is mainly useful for
debugging purposes. If annotate_fields is true (by default),
the returned string will show the names and the values for fields.
If annotate_fields is false, the result string will be more compact by
omitting unambiguous field names. Attributes such as line
numbers and column offsets are not dumped by default. If this is wanted,
include_attributes can be set to true. If indent is a non-negative
integer or string, then the tree will be pretty-printed with that indent
level. None (the default) selects the single line representation.
r c s d ur* d7 d }d }nd}d}t | trt| }g }d}}| jD ]}zt| |} W n ty d}Y qXY n0 | d u rt||dd u rd}qX| \} }
|o|
}|r|d|| f qX|| qXrh| jrh| jD ]t}zt| |} W n ty Y qY n0 | d u r z(dump.._format..)r ASTr" _fieldsgetattrAttributeErrorappend _attributesr: __class____name__joinr2 repr) r rQ prefixsepclsr7 Z allsimpler8 namer# simplerP annotate_fieldsinclude_attributesrH )rQ r rP z sX
&zdump.._formatzexpected AST, got %rN )r )r rT TypeErrorrZ r[ rE )r rd re rH r rc r dumpn s 0
rh c C sV dD ]L}||j v r|| j v rt||d}|dusDt||r|drt| || q| S )z
Copy source location (`lineno`, `col_offset`, `end_lineno`, and `end_col_offset`
attributes) from *old_node* to *new_node* if possible, and return *new_node*.
)lineno
col_offset
end_linenoend_col_offsetNZend_)rY rV hasattr
startswithsetattr)new_nodeZold_nodeattrr# r r r
copy_location s rr c s fdd | dddd | S )a{
When you compile a node tree with compile(), the compiler expects lineno and
col_offset attributes for every node that supports them. This is rather
tedious to fill in for generated nodes, so this helper adds these attributes
recursively where not already set, by setting them to the values of the
parent node. It works recursively starting at *node*.
c s d| j v r"t| ds || _n| j}d| j v rJt| dd d u rD|| _n| j}d| j v rlt| dsf|| _n| j}d| j v rt| dd d u r|| _n| j}t| D ]} ||||| qd S )Nri rk rj rl )rY rm ri rV rk rj rl iter_child_nodes)r ri rj rk rl child_fixr r rv s$
z#fix_missing_locations.._fixrI r r r r ru r fix_missing_locations s rw rI c C sV t | D ]H}d|jv r(t|dd| |_d|jv rt|dd }dur|| |_q| S )z
Increment the line number and end line number of each node in the tree
starting at *node* by *n*. This is useful to "move code" to a different
location in a file.
ri r rk N)walkrY rV ri rk )r nrt rk r r r increment_lineno s
rz c c s8 | j D ],}z|t| |fV W q ty0 Y q0 qdS )zs
Yield a tuple of ``(fieldname, value)`` for each field in ``node._fields``
that is present on *node*.
N)rU rV rW )r fieldr r r iter_fields s
r| c c sL t | D ]>\}}t|tr"|V qt|tr|D ]}t|tr0|V q0qdS )z
Yield all direct child nodes of *node*, that is, all fields that are nodes
and all items of fields that are lists of nodes.
N)r| r rT r2 )r ra r{ itemr r r rs s
rs c C s t | ttttfs"td| jj | jr8t | jd t s|j du s|jdu r W dS |jd }|j d }|j}|j}W n tyR Y dS 0 t| }||kr||| || S |rt|| d| }nd}||| |d } || d| }
||d | }| d| |
|
d |S )aB Get source code segment of the *source* that generated *node*.
If some location information (`lineno`, `end_lineno`, `col_offset`,
or `end_col_offset`) is missing, return None.
If *padded* is `True`, the first line of a multi-line statement will
be padded with spaces to match its original position.
NrI rK r ) rk rl ri rj rW r encodedecoder insertrX r\ ) r r r ri rk rj rl r Zpaddingfirstlastr r r get_source_segmentN s*
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Recursively yield all descendant nodes in the tree starting at *node*
(including *node* itself), in no specified order. This is useful if you
only want to modify nodes in place and don't care about the context.
r )dequeN) collectionsr popleftextendrs )r r Ztodor r r rx s s
rx c @ s( e Zd ZdZdd Zdd Zdd ZdS ) NodeVisitora<
A node visitor base class that walks the abstract syntax tree and calls a
visitor function for every node found. This function may return a value
which is forwarded by the `visit` method.
This class is meant to be subclassed, with the subclass adding visitor
methods.
Per default the visitor functions for the nodes are ``'visit_'`` +
class name of the node. So a `TryFinally` node visit function would
be `visit_TryFinally`. This behavior can be changed by overriding
the `visit` method. If no visitor function exists for a node
(return value `None`) the `generic_visit` visitor is used instead.
Don't use the `NodeVisitor` if you want to apply changes to nodes during
traversing. For this a special visitor exists (`NodeTransformer`) that
allows modifications.
c C s" d|j j }t| || j}||S )z
Visit a node.visit_)rZ r[ rV
generic_visit)selfr methodvisitorr r r visit s zNodeVisitor.visitc C sT t |D ]F\}}t|tr:|D ]}t|tr | | q qt|tr| | qdS )z9Called if no explicit visitor function exists for a node.N)r| r r2 rT r )r r r{ r# r} r r r r s
zNodeVisitor.generic_visitc C s |j }tt|}|d u r@t D ]\}}t||r$|} q@q$|d urd| }zt| |}W n typ Y n&0 dd l}| | dt
d ||S | |S )Nr r z" is deprecated; add visit_Constant ) r# _const_node_type_namesgetr" itemsr rV rW warningswarnDeprecationWarningr ) r r r# type_namer` ra r r r r r r visit_Constant s&
zNodeVisitor.visit_ConstantN)r[
__module__ __qualname____doc__r r r r r r r r s
r c @ s e Zd ZdZdd ZdS )NodeTransformeraC
A :class:`NodeVisitor` subclass that walks the abstract syntax tree and
allows modification of nodes.
The `NodeTransformer` will walk the AST and use the return value of the
visitor methods to replace or remove the old node. If the return value of
the visitor method is ``None``, the node will be removed from its location,
otherwise it is replaced with the return value. The return value may be the
original node in which case no replacement takes place.
Here is an example transformer that rewrites all occurrences of name lookups
(``foo``) to ``data['foo']``::
class RewriteName(NodeTransformer):
def visit_Name(self, node):
return Subscript(
value=Name(id='data', ctx=Load()),
slice=Constant(value=node.id),
ctx=node.ctx
)
Keep in mind that if the node you're operating on has child nodes you must
either transform the child nodes yourself or call the :meth:`generic_visit`
method for the node first.
For nodes that were part of a collection of statements (that applies to all
statement nodes), the visitor may also return a list of nodes rather than
just a single node.
Usually you use the transformer like this::
node = YourTransformer().visit(node)
c C s t |D ]\}}t|trvg }|D ]D}t|tr\| |}|d u rFq"nt|ts\|| q"|| q"||d d < qt|tr| |}|d u rt|| qt||| q|S r ) r| r r2 rT r r rX delattrro )r r r{ old_valueZ
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z NodeTransformer.generic_visitN)r[ r r r r r r r r r s #r ry c C s | j S )z Deprecated. Use value instead.r# r r r r _getter s r c C s
|| _ d S r r r r# r r r _setter s r c @ s e Zd Zdd Zdd ZdS )_ABCc G s
d| _ d S )Nz3Deprecated AST node class. Use ast.Constant instead)r )r` r7 r r r __init__ s z
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z_ABC.__instancecheck__N)r[ r r r r r r r r r s r c O sp |D ]<}|| j vrq| j |}|t|k rt| j d|q| tv rXt|i |S tj| g|R i |S )Nz" got multiple values for argument )rU indexr: rg r[ r r! __new__)r` r7 kwargskeyposr r r _new s
r c @ s e Zd ZdZeZdS )Num)ry Nr[ r r rU r r r r r r r % s r ) metaclassc @ s e Zd ZdZeZdS )r r Nr r r r r r ) s r c @ s e Zd ZdZeZdS )Bytesr Nr r r r r r - s r c @ s e Zd ZeZdS ) NameConstantN)r[ r r r r r r r r r 1 s r c @ s e Zd ZdZdd ZdS )Ellipsisr c O s6 | t u r tdg|R i |S tj| g|R i |S )N.)r r! r )r` r7 r r r r r 7 s zEllipsis.__new__N)r[ r r rU r r r r r r 4 s r .c @ s e Zd ZdZdS )slicezDeprecated AST node class.Nr[ r r r r r r r r R s r c @ s e Zd ZdZdd ZdS )Indexz@Deprecated AST node class. Use the index value directly instead.c K s |S r r )r` r# r r r r r W s z
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|| _ d S r r r r r r _dims_setterh s r c @ s e Zd ZdZdS )Suite/Deprecated AST node class. Unused in Python 3.Nr r r r r r m s r c @ s e Zd ZdZdS )AugLoadr Nr r r r r r p s r c @ s e Zd ZdZdS )AugStorer Nr r r r r r s s r c @ s e Zd ZdZdS )Paramr Nr r r r r r v s r Z1ec @ s e Zd ZdZe Ze Ze Ze Ze Z e Z
e Z e Z e Z
e Ze Ze Ze Ze Ze Ze Ze Ze Zdd ZdS ) _Precedencez5Precedence table that originated from python grammar.c C s, z| | d W S ty& | Y S 0 d S NrI )rZ r r r r r next s z_Precedence.nextN)r[ r r r r TUPLEYIELDTESTORANDNOTCMPEXPRBORBXORBANDSHIFTARITHTERMFACTORPOWERAWAITATOMr r r r r r ~ s( r )'")z"""z'''c s e Zd ZdZddddZdd Zdd Zd
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