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�ZdS(u�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.u+George Boutsioukis <gboutsioukis@gmail.com>iN(udefaultdicti(upytree(ureduce_treecBs2|EeZdZdZej�Zdd�ZdS(uBMNodeu?Class for a node of the Aho-Corasick automaton used in matchingcCs1i|_g|_ttj�|_d|_dS(Nu(utransition_tableufixersunextuBMNodeucountuiducontent(uself((u8/opt/alt/python33/lib64/python3.3/lib2to3/btm_matcher.pyu__init__s		uBMNode.__init__N(u__name__u
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BottomMatcherugThe main matcher class. After instantiating the patterns should
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	uBottomMatcher.__init__cCsh|jj|�t|j�}|j�}|j|d|j�}x|D]}|jj|�qJWdS(u�Reduces a fixer's pattern tree to a linear path and adds it
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match_node((u8/opt/alt/python33/lib64/python3.3/lib2to3/btm_matcher.pyu	add_fixer%s
uBottomMatcher.add_fixercCs|s
|gSt|dt�r�g}x[|dD]O}|j|d|�}x1|D])}|j|j|dd�|��qSWq1W|S|d|jkr�t�}||j|d<n|j|d}|dd�r�|j|dd�d|�}n	|g}|SdS(u5Recursively adds a linear pattern to the AC automatoniustartiN(u
isinstanceutupleuadduextendutransition_tableuBMNode(uselfupatternustartumatch_nodesualternativeu	end_nodesuendu	next_node((u8/opt/alt/python33/lib64/python3.3/lib2to3/btm_matcher.pyuadd1s"
+	"	uBottomMatcher.addc	Cs�|j}tt�}x�|D]y}|}xj|r�d|_x?|jD]4}t|tj�rD|j	dkrDd|_PqDqDW|jdkr�|j	}n	|j}||jkr�|j|}x�|j
D]0}||kr�g||<n||j|�q�Wn�|j}|jdk	r%|jjr%Pn||jkr�|j|}xD|j
D]6}||j�krpg||<n||j|�qKWn|j}q+WqW|S(uuThe main interface with the bottom matcher. The tree is
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        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:
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isinstanceupytreeuLeafuvalueuFalseutypeutransition_tableufixersuappenduparentuNoneukeys(	uselfuleavesucurrent_ac_nodeuresultsuleafucurrent_ast_nodeuchildu
node_tokenufixer((u8/opt/alt/python33/lib64/python3.3/lib2to3/btm_matcher.pyurunSs>	
		!		

	

uBottomMatcher.runcs7td��fdd���|j�td�dS(u<Prints a graphviz diagram of the BM automaton(for debugging)u
digraph g{cs�xy|jj�D]h}|j|}td|j|jt|�t|j�f�|dkrnt|j�n�|�qWdS(Nu%d -> %d [label=%s] //%si(utransition_tableukeysuprintuidu	type_reprustrufixersucontent(unodeusubnode_keyusubnode(u
print_node(u8/opt/alt/python33/lib64/python3.3/lib2to3/btm_matcher.pyu
print_node�s
)u*BottomMatcher.print_ac.<locals>.print_nodeu}N(uprinturoot(uself((u
print_nodeu8/opt/alt/python33/lib64/python3.3/lib2to3/btm_matcher.pyuprint_ac�s

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BottomMatchercCshtsXddlm}x?|jj�D]+\}}t|�tkr&|t|<q&q&Wntj||�S(Ni(upython_symbols(u_type_reprsupygramupython_symbolsu__dict__uitemsutypeuintu
setdefault(utype_numupython_symbolsunameuval((u8/opt/alt/python33/lib64/python3.3/lib2to3/btm_matcher.pyu	type_repr�su	type_repr(u__doc__u
__author__uloggingu	itertoolsucollectionsudefaultdictuupytreeu	btm_utilsureduce_treeuobjectuBMNodeu
BottomMatcheru_type_reprsu	type_repr(((u8/opt/alt/python33/lib64/python3.3/lib2to3/btm_matcher.pyu<module>s	�