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btm_matcher.cpython-310.pyc
o bc @ sl d Z dZddlZddlZddlmZ ddlmZ ddlm Z G dd d e Z G d d d e Z i a d d ZdS )a A bottom-up tree matching algorithm implementation meant to speed up 2to3's matching process. After the tree patterns are reduced to their rarest linear path, a linear Aho-Corasick automaton is created. The linear automaton traverses the linear paths from the leaves to the root of the AST and returns a set of nodes for further matching. This reduces significantly the number of candidate nodes.z+George Boutsioukis <gboutsioukis@gmail.com> N) defaultdict )pytree) reduce_treec @ s e Zd ZdZe Zdd ZdS )BMNodez?Class for a node of the Aho-Corasick automaton used in matchingc C s" i | _ g | _ttj| _d| _d S )N )transition_tablefixersnextr countidcontentself r */usr/lib/python3.10/lib2to3/btm_matcher.py__init__ s zBMNode.__init__N)__name__ __module__ __qualname____doc__ itertoolsr r r r r r r s r c @ s8 e Zd ZdZdd Zdd Zdd Zdd Zd d Zd S ) BottomMatcherzgThe main matcher class. After instantiating the patterns should be added using the add_fixer methodc C s0 t | _t | _| jg| _g | _td| _d S )NRefactoringTool) setmatchr rootnodesr logging getLoggerloggerr r r r r s zBottomMatcher.__init__c C sH | j | t|j}| }| j|| jd}|D ]}|j | qdS )zReduces a fixer's pattern tree to a linear path and adds it to the matcher(a common Aho-Corasick automaton). The fixer is appended on the matching states and called when they are reachedstartN)r appendr pattern_treeget_linear_subpatternaddr )r fixertreelinear match_nodes match_noder r r add_fixer% s zBottomMatcher.add_fixerc C s |s|gS t |d tr0g }|d D ]}| j||d}|D ]}|| |dd | q q|S |d |jvrBt }||j|d < n|j|d }|dd r\| j|dd |d}|S |g}|S )z5Recursively adds a linear pattern to the AC automatonr r! r N) isinstancetupler& extendr r )r patternr" r* alternative end_nodesend next_noder r r r& 1 s& zBottomMatcher.addc C s | j }tt}|D ]l}|}|rud|_|jD ]}t|tjr'|jdkr'd|_ nq|j dkr1|j}n|j }||j v rL|j | }|j D ] }|| | qAn$| j }|j durY|j jrYn ||j v rp|j | }|j D ] }|| | qf|j }|sq |S )au The main interface with the bottom matcher. The tree is traversed from the bottom using the constructed automaton. Nodes are only checked once as the tree is retraversed. When the automaton fails, we give it one more shot(in case the above tree matches as a whole with the rejected leaf), then we break for the next leaf. There is the special case of multiple arguments(see code comments) where we recheck the nodes Args: The leaves of the AST tree to be matched Returns: A dictionary of node matches with fixers as the keys T;Fr N)r r list was_checkedchildrenr- r Leafvaluetyper r r# parent) r leavescurrent_ac_noderesultsleafcurrent_ast_nodechild node_tokenr' r r r runS s@ "zBottomMatcher.runc s* t d fdd | j t d dS )z<Prints a graphviz diagram of the BM automaton(for debugging)z digraph g{c sZ | j D ]%}| j | }td| j|jt|t|jf |dkr&t|j | qd S )Nz%d -> %d [label=%s] //%sr )r keysprintr type_reprstrr r )node subnode_keysubnode print_noder r rM s z*BottomMatcher.print_ac.<locals>.print_node}N)rF r r r rL r print_ac s zBottomMatcher.print_acN) r r r r r r, r& rD rO r r r r r s " 8r c C sD t s ddlm} |j D ]\}}t|tkr|t |< q t | | S )Nr )python_symbols) _type_reprspygramrP __dict__itemsr; int setdefault)type_numrP namevalr r r rG s rG )r __author__r r collectionsr r r btm_utilsr objectr r rQ rG r r r r <module> s