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annotate ZTUtils/Tree.py @ 1029:c3e391d9c4e9

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author Richard Jones <richard@users.sourceforge.net>
date Tue, 03 Sep 2002 07:42:38 +0000
parents 7fe79c67aaa9
children
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1 ##############################################################################
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2 #
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3 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
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4 #
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5 # This software is subject to the provisions of the Zope Public License,
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6 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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10 # FOR A PARTICULAR PURPOSE
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11 #
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12 ##############################################################################
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13 __doc__='''Tree manipulation classes
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14
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15 $Id: Tree.py,v 1.1 2002-08-30 08:25:34 richard Exp $'''
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16 __version__='$Revision: 1.1 $'[11:-2]
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17
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18 from Acquisition import Explicit
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19 from ComputedAttribute import ComputedAttribute
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20
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21 class TreeNode(Explicit):
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22 __allow_access_to_unprotected_subobjects__ = 1
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23 state = 0 # leaf
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24 height = 1
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25 size = 1
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26 def __init__(self):
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27 self._child_list = []
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28 def _add_child(self, child):
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29 'Add a child which already has all of its children.'
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30 self._child_list.append(child)
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31 self.height = max(self.height, child.height + 1)
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32 self.size = self.size + child.size
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33 def flat(self):
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34 'Return a flattened preorder list of tree nodes'
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35 items = []
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36 self.walk(items.append)
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37 return items
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38 def walk(self, f, data=None):
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39 'Preorder walk this tree, passing each node to a function'
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40 if data is None:
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41 f(self)
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42 else:
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43 f(self, data)
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44 for child in self._child_list:
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45 child.__of__(self).walk(f, data)
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46 def _depth(self):
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47 return self.aq_parent.depth + 1
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48 depth = ComputedAttribute(_depth, 1)
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49 def __getitem__(self, index):
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50 return self._child_list[index].__of__(self)
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51 def __len__(self):
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52 return len(self._child_list)
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53
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54 _marker = []
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55
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56 class TreeMaker:
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57 '''Class for mapping a hierachy of objects into a tree of nodes.'''
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58
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59 __allow_access_to_unprotected_subobjects__ = 1
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60
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61 _id = 'tpId'
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62 _values = 'tpValues'
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63 _assume_children = 0
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64 _values_filter = None
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65 _values_function = None
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66 _expand_root = 1
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67
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68 def setChildAccess(self, attrname=_marker, filter=_marker,
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69 function=_marker):
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70 '''Set the criteria for fetching child nodes.
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71
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72 Child nodes can be accessed through either an attribute name
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73 or callback function. Children fetched by attribute name can
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74 be filtered through a callback function.
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75 '''
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76 if function is _marker:
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77 self._values_function = None
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78 if attrname is not _marker:
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79 self._values = str(attrname)
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80 if filter is not _marker:
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81 self._values_filter = filter
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82 else:
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83 self._values_function = function
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84
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85 def tree(self, root, expanded=None, subtree=0):
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86 '''Create a tree from root, with specified nodes expanded.
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87
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88 "expanded" must be false, true, or a mapping.
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89 Each key of the mapping is the id of a top-level expanded
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90 node, and each value is the "expanded" value for the
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91 children of that node.
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92 '''
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93 node = self.node(root)
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94 child_exp = expanded
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95 if not simple_type(expanded):
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96 # Assume a mapping
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97 expanded = expanded.has_key(node.id)
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98 child_exp = child_exp.get(node.id)
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99 if expanded or (not subtree and self._expand_root):
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100 children = self.getChildren(root)
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101 if children:
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102 node.state = 1 # expanded
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103 for child in children:
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104 node._add_child(self.tree(child, child_exp, 1))
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105 elif self.hasChildren(root):
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106 node.state = -1 # collapsed
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107 if not subtree:
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108 node.depth = 0
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109 if hasattr(self, 'markRoot'):
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110 self.markRoot(node)
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111 return node
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112
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113 def node(self, object):
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114 node = TreeNode()
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115 node.object = object
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116 node.id = b2a(self.getId(object))
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117 return node
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118
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119 def getId(self, object):
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120 id_attr = self._id
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121 if hasattr(object, id_attr):
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122 obid = getattr(object, id_attr)
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123 if not simple_type(obid): obid = obid()
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124 return obid
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125 if hasattr(object, '_p_oid'): return str(object._p_oid)
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126 return id(object)
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127
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128 def hasChildren(self, object):
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129 if self._assume_children:
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130 return 1
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131 return self.getChildren(object)
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132
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133 def getChildren(self, object):
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134 if self._values_function is not None:
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135 return self._values_function(object)
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136 if self._values_filter and hasattr(object, 'aq_acquire'):
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137 return object.aq_acquire(self._values, aqcallback,
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138 self._values_filter)()
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139 return getattr(object, self._values)()
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140
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141 def simple_type(ob,
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142 is_simple={type(''):1, type(0):1, type(0.0):1,
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143 type(0L):1, type(None):1 }.has_key):
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144 return is_simple(type(ob))
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145
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146 def aqcallback(self, inst, parent, name, value, filter):
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147 return filter(self, inst, parent, name, value)
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148
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149 from binascii import b2a_base64, a2b_base64
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150 import string
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151 from string import split, join, translate
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152
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153 a2u_map = string.maketrans('+/=', '-._')
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154 u2a_map = string.maketrans('-._', '+/=')
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155
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156 def b2a(s):
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157 '''Encode a value as a cookie- and url-safe string.
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158
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159 Encoded string use only alpahnumeric characters, and "._-".
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160 '''
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161 s = str(s)
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162 if len(s) <= 57:
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163 return translate(b2a_base64(s)[:-1], a2u_map)
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164 frags = []
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165 for i in range(0, len(s), 57):
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166 frags.append(b2a_base64(s[i:i + 57])[:-1])
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167 return translate(join(frags, ''), a2u_map)
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168
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169 def a2b(s):
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170 '''Decode a b2a-encoded string.'''
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171 s = translate(s, u2a_map)
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172 if len(s) <= 76:
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173 return a2b_base64(s)
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174 frags = []
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175 for i in range(0, len(s), 76):
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176 frags.append(a2b_base64(s[i:i + 76]))
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177 return join(frags, '')
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178
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179 def encodeExpansion(nodes):
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180 '''Encode the expanded node ids of a tree into a string.
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181
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182 Accepts a list of nodes, such as that produced by root.flat().
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183 Marks each expanded node with an expansion_number attribute.
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184 Since node ids are encoded, the resulting string is safe for
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185 use in cookies and URLs.
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186 '''
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187 steps = []
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188 last_depth = -1
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189 n = 0
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190 for node in nodes:
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191 if node.state <=0: continue
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192 dd = last_depth - node.depth + 1
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193 last_depth = node.depth
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194 if dd > 0:
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195 steps.append('.' * dd)
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196 steps.append(node.id)
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197 node.expansion_number = n
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198 n = n + 1
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199 return join(steps, ':')
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200
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201 def decodeExpansion(s, nth=None):
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202 '''Decode an expanded node map from a string.
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203
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204 If nth is an integer, also return the (map, key) pair for the nth entry.
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205 '''
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206 map = m = {}
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207 mstack = []
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208 pop = 0
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209 nth_pair = None
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210 if nth is not None:
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211 nth_pair = (None, None)
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212 for step in split(s, ':'):
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213 if step[:1] == '.':
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214 pop = len(step) - 1
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215 continue
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216 if pop < 0:
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217 mstack.append(m)
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218 m[obid] = {}
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219 m = m[obid]
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220 elif map:
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221 m[obid] = None
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222 if len(step) == 0:
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223 return map
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224 obid = step
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225 if pop > 0:
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226 m = mstack[-pop]
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227 del mstack[-pop:]
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228 pop = -1
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229 if nth == 0:
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230 nth_pair = (m, obid)
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231 nth = None
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232 elif nth is not None:
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233 nth = nth - 1
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234 m[obid] = None
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235 if nth == 0:
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236 return map, (m, obid)
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237 if nth_pair is not None:
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238 return map, nth_pair
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239 return map
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240
Roundup Issue Tracker: http://roundup-tracker.org/