³ņ ^e1?c@s6ddkZddd„ƒYZddd„ƒYZdS(i’’’’NtTreecBs>eZdZdd„Zd„Zd„Zd„Zd„ZRS(s Generic n-ary tree node object Children are additive; no provision for deleting them. The birth order of children is recorded: 0 for the first child added, 1 for the second, and so on. Exports: Tree(parent, value=None) Constructor .parent If this is the root node, None, otherwise the parent's Tree object. .childList List of children, zero or more Tree objects. .value Value passed to constructor; can be any type. .birthOrder If this is the root node, 0, otherwise the index of this child in the parent's .childList .nChildren() Returns the number of self's children. .nthChild(n) Returns the nth child; raises IndexError if n is not a valid child number. .fullPath(): Returns path to self as a list of child numbers. .nodeId(): Returns path to self as a NodeId. cCs[||_||_g|_|djo d|_n#t|iƒ|_|ii|ƒdS(s§ Constructor for a Tree object. [ if (parent is None or a Tree object) -> if (parent is None) -> return a new Tree object with no parent, no children, and value (value) else -> return a new Tree object added as the next new child of parent (parent) and no children, and value (value) ] iN(tparenttvaluet childListtNonet birthOrdertlentappend(tselfRR((s!/u/john/projects/pystyler/tree.pyt__init__)s    cCs t|iƒS(s? [ return the number of children of self ] (RR(R((s!/u/john/projects/pystyler/tree.pyt nChildrenJscCs |i|S(så [ if (n is an integer) -> if (0 <= n < (number of self's children) -> return self's (n)th child, counting from 0 else -> raise IndexError ] (R(Rtn((s!/u/john/projects/pystyler/tree.pytnthChildSscCsKg}|i}|}x/|o'|id|iƒ|i|}}qW|S(sšReturns a list of child numbers from root to self. [ return a sequence [c0, c1, ..., ci] such that self is root.nthChild(c0).nthChild(c1). ... .nthChild(ci), or an empty list if self is the root ] i(RtinsertR(RtresultRtkid((s!/u/john/projects/pystyler/tree.pytfullPath`s   cCs|iƒ}t|ƒS(s:Returns the path to self in the tree as a NodeId. (RtNodeId(RR((s!/u/john/projects/pystyler/tree.pytnodeIdzs N( t__name__t __module__t__doc__RR R R RR(((s!/u/john/projects/pystyler/tree.pyRs  ! RcBs;eZdZd„Zd„Zd„Zd„Zd„ZRS(s<Represents the location of a node in a tree as a path from the root. Exports: NodeId(path): [ if path is a list of zero or more nonnegative integers -> return a new NodeId object representing that node-id ] .path: [ as passed to constructor ] .__str__(): [ return self as a string ] .find(root): [ if root is a Tree object -> if self describes a path to a node that exists in the tree rooted at (root) -> return the .value of that node else -> return None ] .isOnPath(node): [ if node is a Tree object -> if the path from the root to node is a prefix of self -> return 1 else -> return 0 ] cCs ||_dS(s*Constructor for the NodeId object N(tpath(RR((s!/u/john/projects/pystyler/tree.pyR £scCs"tt|iƒ}ti|dƒS(s(Return self in displayable form t/(tmaptstrRtstringtjoin(RtL((s!/u/john/projects/pystyler/tree.pyt__str__«scCs|i|dƒS(sDLocate the tree node described by self and return its value i(t_NodeId__reFind(Rtnode((s!/u/john/projects/pystyler/tree.pytfindŗscCso|t|iƒjo |iSn|i|}y|i|ƒ}Wntj o dSnX|i||dƒS(s›Recursive node finding routine. Starts at self.path[i:]. [ if (node is a Tree object) and (0 <= i <= len(self.path)) -> if i == len(self.path) -> return node's value else if self.path[i:] describes a path from node to some tree object T -> return T else -> return None ] iN(RRRR t IndexErrorRR(RRtitchildNotchild((s!/u/john/projects/pystyler/tree.pyt__reFindĀs   cCsq|iƒ}t|ƒt|iƒjodSnx:tt|ƒƒD]&}|||i|jodSqCqCWdS(s5Is self's path to or through the given node? ii(RRRtrange(RRtnodePathR"((s!/u/john/projects/pystyler/tree.pytisOnPathķs  (RRRR RR RR((((s!/u/john/projects/pystyler/tree.pyR‰s     +(((RRR(((s!/u/john/projects/pystyler/tree.pyss y