ó î%![c@sxdZddlZddlmZdZyejejfZWnek r]ejfZnXde fd„ƒYZ dS(sSmall AST optimizations.iĸĸĸĸN(tnodestASTPeepholeOptimizercBseZdZdd„ZRS(s;Class for applying small optimizations to generate new AST.cs{g}|}xôt|tjƒrt|jtjƒs:dSt|jjtjƒ sit|jtjƒ rmdSt|jtƒsƒdS|j |jj ƒ|j}t|tjƒrt|jtƒrt|jtƒr|j |jj ƒ|j |jj ƒPqqW|s dSt |dƒ‰t ‡fd†|dDƒƒrAdSˆƒj t|ƒƒ}tj||j|j|ƒ}|S(sŲOptimize BinOps with string Const nodes on the lhs. This fixes an infinite recursion crash, where multiple strings are joined using the addition operator. With a sufficient number of such strings, astroid will fail with a maximum recursion limit exceeded. The function will return a Const node with all the strings already joined. Return ``None`` if no AST node can be obtained through optimization. ic3s|]}t|ˆƒ VqdS(N(t isinstance(t.0telement(tknown(s2lib/python2.7/site-packages/astroid/astpeephole.pys DsiN(Rt_asttBinOptlefttNonetoptAddtrightt_TYPEStappendtsttypetanytjointreversedRtConsttlinenot col_offset(tselftnodetparentt ast_nodestcurrenttvaluetnewnode((Rs2lib/python2.7/site-packages/astroid/astpeephole.pytoptimize_binops6  N(t__name__t __module__t__doc__R R(((s2lib/python2.7/site-packages/astroid/astpeephole.pyRs(R( R!RtastroidRt__all__tStrtBytesR tAttributeErrortobjectR(((s2lib/python2.7/site-packages/astroid/astpeephole.pyts