bkmk_objects.py

   1 """Objects to represent bookmarks.html structure
   2
   3 This file is a part of Bookmarks database and Internet robot.
   4
   5 """
   6
   7 __author__ = "Oleg Broytman <phd@phdru.name>"
   8 __copyright__ = "Copyright (C) 2000-2014 PhiloSoft Design"
   9 __license__ = "GNU GPL"
  10
  11 __all__ = ['Folder', 'Bookmark', 'Ruler', 'Walker', 'Writer', 'Robot',
  12     'InverseLinker', 'Linear', 'make_linear', 'make_tree', 'break_tree',
  13     'quote_title', 'unquote_title', 'parse_params', 'set_params',
  14 ]
  15
  16
  17 import os, urllib
  18
  19 BKMK_FORMAT = os.environ.get("BKMK_FORMAT", "MOZILLA")
  20
  21 class Folder(list):
  22    isFolder = 1
  23    isBookmark = 0
  24
  25    def __init__(self, add_date=None, comment='', last_modified=None):
  26       super(Folder, self).__init__()
  27       self.comment = comment
  28       self.add_date = add_date
  29       self.last_modified = last_modified
  30
  31    def walk_depth(self, walker, level=0):
  32       if hasattr(self, "header"): # root folder
  33          prune = 0
  34          walker.root_folder(self)
  35       else:
  36          prune = walker.prune_folder(self)
  37          if not prune:
  38             walker.start_folder(self, level)
  39
  40       if not prune:
  41          for object in self:
  42             if object.isFolder:
  43                object.walk_depth(walker, level+1)
  44             elif object.isBookmark:
  45                walker.bookmark(object, level)
  46             else:
  47                walker.ruler(object, level)
  48
  49          walker.end_folder(self, level)
  50
  51
  52 class Bookmark(object):
  53    isFolder = 0
  54    isBookmark = 1
  55
  56    def __init__(self, href, add_date, last_visit=None, last_modified=None,
  57          keyword=None, comment='', icon_href=None, icon=None,
  58          charset=None, parser_charset=None):
  59       protocol, request = urllib.splittype(href)
  60       user, password, port = None, None, None
  61       host, path = urllib.splithost(request)
  62       if host:
  63          user, host = urllib.splituser(host)
  64          if user:
  65             user, password = urllib.splitpasswd(user)
  66          host, port = urllib.splitport(host)
  67          if port: port = int(port)
  68
  69       if protocol == 'place':
  70          href = protocol + ":"
  71       else:
  72          href = protocol + "://"
  73       if user:
  74          href += urllib.quote(user)
  75          if password:
  76             href += ':' + urllib.quote(password)
  77          href += '@'
  78       if host:
  79          href += host.decode(parser_charset or 'utf-8').encode('idna')
  80          if port:
  81             href += ':%d' % port
  82       if path:
  83          href += path
  84
  85       self.href = href
  86       self.add_date = add_date
  87       self.last_visit = last_visit
  88       self.last_modified = last_modified
  89       self.keyword = keyword
  90       self.comment = comment
  91       self.icon_href = icon_href
  92       self.icon = icon
  93       self.charset = charset
  94
  95
  96 class Ruler(object):
  97    isFolder = 0
  98    isBookmark = 0
  99
 100
 101 class Walker(object):
 102    """
 103       Interface class. Any instance that will be passed to Folder.walk_depth
 104       may be derived from this class. It is not mandatory - unlike Java
 105       Python does not require interface classes; but it is convenient to have
 106       some methods predefined to no-op, in case you do not want to
 107       provide end_folder etc.
 108    """
 109
 110    def root_folder(self, r):
 111       pass
 112
 113    def start_folder(self, f, level):
 114       pass
 115
 116    def end_folder(self, f, level):
 117       pass
 118
 119    def bookmark(self, b, level):
 120       pass
 121
 122    def ruler(self, r, level):
 123       pass
 124
 125    def prune_folder(self, folder):
 126       return 0
 127
 128
 129 class Writer(Walker):
 130    def __init__(self, outfile, prune=None):
 131       self.outfile = outfile
 132       self.prune = prune
 133
 134    def prune_folder(self, folder):
 135       return self.prune == folder.name
 136
 137
 138 class Robot(object):
 139    def __init__(self, log):
 140       self.log = log
 141
 142    def stop(self):
 143       pass # Nothing to do on cleanup
 144
 145
 146 # Helper class to make inverese links (nodes linked to their parent)
 147 class InverseLinker(Walker):
 148    def root_folder(self, r):
 149       self.parent_stack = [r]
 150
 151    def start_folder(self, f, level):
 152       f.parent = self.parent_stack[-1]
 153       self.parent_stack.append(f) # Push the folder onto the stack of parents
 154
 155    def end_folder(self, f, level):
 156       del self.parent_stack[-1]   # Pop off the stack
 157
 158    def bookmark(self, b, level):
 159       b.parent = self.parent_stack[-1]
 160
 161    def ruler(self, r, level):
 162       r.parent = self.parent_stack[-1]
 163
 164
 165 # Helper class to make linear represenatation of the tree
 166 class Linear(Walker):
 167    def root_folder(self, r):
 168       r.linear = [r]
 169       self.linear = r.linear
 170
 171    def add_object(self, object):
 172       self.linear.append(object)
 173
 174    def start_folder(self, f, level):
 175       self.add_object(f)
 176
 177    def bookmark(self, b, level):
 178       self.add_object(b)
 179
 180    def ruler(self, r, level):
 181       self.add_object(r)
 182
 183
 184 # Helper - make linked linear represenatation of the tree, suitable to be stored in sequential storage
 185 def make_linear(root_folder):
 186    linker = InverseLinker()
 187    root_folder.walk_depth(linker)
 188
 189    linear = Linear()
 190    root_folder.walk_depth(linear)
 191
 192
 193 # Helper, opposite of make_linear - make a tree from the linked linear representation
 194 def make_tree(linear):
 195    root_folder = linear[0]
 196    del linear[0]
 197
 198    for object in linear:
 199       object.parent.append(object)
 200
 201    return root_folder
 202
 203 def break_tree(linear):
 204    del linear[0]
 205
 206    for object in linear:
 207       del object.parent
 208
 209
 210 def quote_title(title):
 211    if BKMK_FORMAT == "MOZILLA":
 212       title = title.replace("'", "&#39;")
 213    return title
 214
 215 def unquote_title(title):
 216    if BKMK_FORMAT == "MOZILLA":
 217       from HTMLParser import HTMLParser
 218       title = HTMLParser().unescape(title.replace("&amp;", '&').decode('utf-8'))
 219       title = title.encode('utf-8').replace("&#39;", "'")
 220    return title
 221
 222
 223 def parse_params(param_str):
 224     params = param_str.split(':')
 225     main_param = params.pop(0)
 226     param_list = {}
 227     for param in params:
 228         key, value = param.split('=', 1)
 229         param_list[key] = value
 230     return main_param, param_list
 231
 232 def set_params(obj, params):
 233     if hasattr(params, "items"):
 234         params = params.items()
 235     for key, value in params:
 236         setattr(obj, key, value)