U A`&@s|dZddlmZddlmZmZddlmZmZeZ eZ ej Z eZ dZdZdZGdd d eZdd d Zd dZddZd S)z0Utility functions used by the btm_matcher module)pytree)grammartoken)pattern_symbolspython_symbolsc@s:eZdZdZd ddZddZddZd d Zd d ZdS)MinNodezThis class serves as an intermediate representation of the pattern tree during the conversion to sets of leaf-to-root subpatternsNcCs.||_||_g|_d|_d|_g|_g|_dS)NF)typenamechildrenleafparent alternativesgroup)selfr r r'/usr/lib/python3.8/lib2to3/btm_utils.py__init__szMinNode.__init__cCst|jdt|jS)N )strr r )rrrr__repr__szMinNode.__repr__cCs|}g}|r|jtkr^|j|t|jt|jkrRt|jg}g|_|j}qn |j}d}q|jtkr|j |t|j t|jkrt |j }g|_ |j}qn |j}d}q|jt j kr|j r||j n ||j|j}q|S)zInternal method. Returns a characteristic path of the pattern tree. This method must be run for all leaves until the linear subpatterns are merged into a singleN)r TYPE_ALTERNATIVESrappendlenr tupler TYPE_GROUPrget_characteristic_subpattern token_labelsNAMEr )rnodesubprrr leaf_to_root!s8       zMinNode.leaf_to_rootcCs&|D]}|}|r|SqdS)aDrives the leaf_to_root method. The reason that leaf_to_root must be run multiple times is because we need to reject 'group' matches; for example the alternative form (a | b c) creates a group [b c] that needs to be matched. Since matching multiple linear patterns overcomes the automaton's capabilities, leaf_to_root merges each group into a single choice based on 'characteristic'ity, i.e. (a|b c) -> (a|b) if b more characteristic than c Returns: The most 'characteristic'(as defined by get_characteristic_subpattern) path for the compiled pattern tree. N)leavesr#)rlr"rrrget_linear_subpatternKs zMinNode.get_linear_subpatternccs*|jD]}|EdHq|js&|VdS)z-Generator that returns the leaves of the treeN)r r$)rchildrrrr$`s zMinNode.leaves)NN) __name__ __module__ __qualname____doc__rrr#r&r$rrrrr s  *r Nc Csd}|jtjkr|jd}|jtjkrt|jdkrFt|jd|}nFttd}|jD]4}|j |drlqVt||}|dk rV|j |qVn|jtj krt|jdkrtt d}|jD]}t||}|r|j |q|jsd}nt|jd|}n|jtj krt|jdtjr>|jdjdkr>t|jd|St|jdtjrd|jdjdkst|jdkrt|jddr|jdjdkrdSd }d}d}d }d} d } |jD]d}|jtjkrd }|}n*|jtjkrd }|} n|jtjkr|}t|dr|jd krd } q| rT|jd} t| dr^| jdkr^|jd } n |jd} | jtjkr| jd krttd}n4tt| jrttt| jd}nttt| jd}n\| jtjkr| jd} | tkrtt| d}nttj| d}n| jtjkrt||}|rL| jdjdkr4d}n| jdjdkrHnt|r|dk r|jddD]&}t||}|dk rj|j |qj|r||_|S)z Internal function. Reduces a compiled pattern tree to an intermediate representation suitable for feeding the automaton. This also trims off any optional pattern elements(like [a], a*). N)r r([valueTF=any')r r *+r)r symsZMatcherr Z Alternativesr reduce_treer rindexrZ AlternativerZUnit isinstancerZLeafr0hasattrZDetailsZRepeaterrr TYPE_ANYgetattrpysymsSTRINGstriptokensNotImplementedErrorr) r!rZnew_noder'ZreducedrZ details_nodeZalternatives_nodeZ has_repeaterZ repeater_nodeZhas_variable_nameZ name_leafr rrrr8gs                      r8cst|ts|St|dkr"|dSg}g}dddddgg}d|D]d}tt|d d rDtt|fd d r|||qDtt|fd d r||qD||qD|r|}n|r|}n|r|}t|td S)zPicks the most characteristic from a list of linear patterns Current order used is: names > common_names > common_chars rr,inforifnotNonez[]().,:cSs t|tkSN)r rxrrrz/get_characteristic_subpattern..cst|to|kSrHr:rrI) common_charsrrrKrLcst|to|kSrHrMrI) common_namesrrrKrL)key)r:listrr3rec_testrmax)Z subpatternsZsubpatterns_with_namesZsubpatterns_with_common_namesZsubpatterns_with_common_chars subpatternr)rNrOrrs6       rccs8|D].}t|ttfr(t||EdHq||VqdS)zPTests test_func on all items of sequence and items of included sub-iterablesN)r:rQrrR)ZsequenceZ test_funcrJrrrrRsrR)N)r+rZpgen2rrZpygramrrr7r>ZopmaprArr<rrobjectr r8rrRrrrrs W %