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Python parse tree definitions.
This is a very concrete parse tree; we need to keep every token and
even the comments and whitespace between tokens.
There's also a pattern matching implementation here.
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setdefault)�type_numr �name�val� r �%/usr/lib/python3.10/lib2to3/pytree.py� type_repr s � r c @ s� e Zd ZdZdZdZdZdZdZdd� Z dd� Z
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Abstract base class for Node and Leaf.
This provides some default functionality and boilerplate using the
template pattern.
A node may be a subnode of at most one parent.
Nr Fc O � | t usJ d��t�| �S )z7Constructor that prevents Base from being instantiated.zCannot instantiate Base)r �object�__new__��cls�args�kwdsr r r r 1 �
z Base.__new__c C s | j |j urtS | �|�S )zW
Compare two nodes for equality.
This calls the method _eq().
)� __class__�NotImplemented�_eq��self�otherr r r �__eq__6 s
z Base.__eq__c C � t �)a_
Compare two nodes for equality.
This is called by __eq__ and __ne__. It is only called if the two nodes
have the same type. This must be implemented by the concrete subclass.
Nodes should be considered equal if they have the same structure,
ignoring the prefix string and other context information.
��NotImplementedErrorr r r r r B s zBase._eqc C r" )zr
Return a cloned (deep) copy of self.
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Return a post-order iterator for the tree.
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Return a pre-order iterator for the tree.
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r# r% r r r � pre_order] r' zBase.pre_orderc C s� | j dus J t| ���|dusJ �t|t�s|g}g }d}| j jD ]"}|| u r>|r2J | j j| |f��|dur;|�|� d}q!|�|� q!|sNJ | j| |f��| j �� || j _|D ]}| j |_ qYd| _ dS )z/Replace this node with a new one in the parent.NFT)�parent�str�
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z Base.replacec C s2 | }t |t�s|js dS |jd }t |t�r|jS )z9Return the line number which generated the invocant node.Nr )r, �Leafr. �lineno�r �noder r r �
get_lineno| s
�zBase.get_linenoc C s | j r| j �� d| _d S )NT)r* r1 � was_changedr% r r r r1 � s
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Remove the node from the tree. Returns the position of the node in its
parent's children before it was removed.
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The node immediately following the invocant in their parent's children
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The node immediately preceding the invocant in their parent's children
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��zBase.prev_siblingc c s � | j D ] }|�� E d H qd S �N)r. �leaves�r rC r r r rG � s �
�z Base.leavesc C s | j d u rdS d| j �� S )Nr r )r* �depthr% r r r rI � s
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<listcomp> s z Node.clone.<locals>.<listcomp>�r_ )r\ r r. r_ r% r r r r& s �z
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zNode.post_orderc c s& � | V | j D ] }|�� E dH qdS �z)Return a pre-order iterator for the tree.N)r. r) rH r r r r) s
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The whitespace and comments preceding this node in the input.
rJ r �r. rK r% r r r rK s z Node.prefixc C s | j r || j d _d S d S �Nr rq �r rK r r r rK s �c C s( | |_ d| j| _ || j|< | �� dS )z�
Equivalent to 'node.children[i] = child'. This method also sets the
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Equivalent to 'node.children.insert(i, child)'. This method also sets
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Equivalent to 'node.children.append(child)'. This method also sets the
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Initializer.
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)rz r% r r r rK s z Leaf.prefixc C s | � � || _d S rF )r1 rz rs r r r rK � s
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Convert raw node information to a Node or Leaf instance.
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grammar rule produces a new complete node, so that the tree is build
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A pattern is a tree matching pattern.
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- NodePattern matches a single node (usually non-leaf);
- WildcardPattern matches a sequence of nodes of variable length.
Nc O r )z>Constructor that prevents BasePattern from being instantiated.z Cannot instantiate BasePattern)r� r r r r r r r � r zBasePattern.__new__c C sV t | j�| j| jg}|r |d d u r |d= |r |d d u sd| jjd�tt|��f S )N���z%s(%s)z, ) r r �contentr
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A subclass can define this as a hook for optimizations.
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Does this pattern exactly match a node?
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r Fr )r� r� )r �nodesr� r r r � match_seq� s zBasePattern.match_seqc c s0 � i }|r| � |d |�rd|fV dS dS dS )z}
Generator yielding all matches for this pattern.
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� LeafPatternNc C s` |durd| krdk sJ |�� J |��|dur%t |t�s%J t|���|| _|| _|| _dS )ap
Initializer. Takes optional type, content, and name.
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this matches any *leaf* node; the content may still be required.
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dict under that key.
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Match the pattern's content to the node's children.
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r� c @ s$ e Zd ZdZddd�Zddd�ZdS ) � NodePatternFNc C s� |dur |dks J |��|dur;t |t�rJ t|���t|�}t|�D ]\}}t |t�s2J ||f��t |t�r:d| _q#|| _|| _ || _
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Initializer. Takes optional type, content, and name.
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type is None this matches *any* single node (leaf or not),
except if content is not None, in which it only matches
non-leaf nodes that also match the content pattern.
The content, if not None, must be a sequence of Patterns that
must match the node's children exactly. If the content is
given, the type must not be None.
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A wildcard pattern can match zero or more nodes.
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.* .+ .? .{m,n}
(a b c | d e | f)
(...)* (...)+ (...)? (...){m,n}
except it always uses non-greedy matching.
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Initializer.
Args:
content: optional sequence of subsequences of patterns;
if absent, matches one node;
if present, each subsequence is an alternative [*]
min: optional minimum number of times to match, default 0
max: optional maximum number of times to match, default HUGE
name: optional name assigned to this match
[*] Thus, if content is [[a, b, c], [d, e], [f, g, h]] this is
equivalent to (a b c | d e | f g h); if content is None,
this is equivalent to '.' in regular expression terms.
The min and max parameters work as follows:
min=0, max=maxint: .*
min=1, max=maxint: .+
min=0, max=1: .?
min=1, max=1: .
If content is not None, replace the dot with the parenthesized
list of alternatives, e.g. (a b c | d e | f g h)*
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pattern doesn't have any matches.
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zNegatedPattern.__init__c C s dS )NFr r: r r r r� ( s zNegatedPattern.matchc C s t |�dkS rr )r� )r r� r r r r� , s zNegatedPattern.match_seqc c sR � | j d u rt|�dkrdi fV d S d S | j �|�D ]\}} d S di fV d S rr )r� r� r� )r r� r� r� r r r r� 0 s �
�z NegatedPattern.generate_matchesrF )rS rT rU ra r� r� r� r r r r r� s
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Generator yielding matches for a sequence of patterns and nodes.
Args:
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nodes: a sequence of nodes
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results: dict containing named submatches.
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