| 1 | # This program is public domain |
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| 2 | """ |
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| 3 | File extension registry. |
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| 4 | |
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| 5 | This provides routines for opening files based on extension, |
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| 6 | and registers the built-in file extensions. |
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| 7 | """ |
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| 8 | import imp,os,sys |
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| 9 | import logging |
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| 10 | import os.path |
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| 11 | def _findReaders(dir): |
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| 12 | # List of plugin objects |
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| 13 | plugins = [] |
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| 14 | # Go through files in plug-in directory |
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| 15 | try: |
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| 16 | |
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| 17 | list = os.listdir(dir) |
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| 18 | for item in list: |
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| 19 | |
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| 20 | toks = os.path.splitext(os.path.basename(item)) |
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| 21 | if toks[1]=='.py' and not toks[0]=='__init__': |
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| 22 | name = toks[0] |
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| 23 | path = [os.path.abspath(dir)] |
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| 24 | file = None |
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| 25 | #print "in findplugings",path |
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| 26 | try: |
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| 27 | (file, path, info) = imp.find_module(name, path) |
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| 28 | module = imp.load_module( name, file, item, info ) |
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| 29 | if hasattr(module, "Reader"): |
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| 30 | try: |
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| 31 | plugins.append(module.Reader()) |
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| 32 | except: |
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| 33 | log("Error accessing Reader in %s\n %s" % (name, sys.exc_value)) |
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| 34 | except : |
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| 35 | log("Error importing %s\n %s" % (name, sys.exc_value)) |
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| 36 | finally: |
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| 37 | if not file==None: |
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| 38 | file.close() |
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| 39 | except: |
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| 40 | # Should raise and catch at a higher level and display error on status bar |
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| 41 | pass |
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| 42 | return plugins |
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| 43 | class Loader(object): |
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| 44 | |
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| 45 | __load = None |
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| 46 | class Load(object): |
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| 47 | |
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| 48 | def __init__(self): |
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| 49 | self.readers = {} |
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| 50 | self.reading=None |
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| 51 | self.__setitem__() |
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| 52 | #print "in loader",self.readers |
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| 53 | |
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| 54 | def __setitem__(self, ext=None, reader=None): |
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| 55 | import os |
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| 56 | if reader==None and ext==None:#1st load |
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| 57 | plugReader=None |
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| 58 | if os.path.isdir('plugins'): |
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| 59 | #print "plugreader in pluging",plugReader |
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| 60 | plugReader=_findReaders('plugins')# import all module in plugins |
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| 61 | if os.path.isdir('../plugins'): |
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| 62 | #print "plugreader in Dataloader pluging",plugReader |
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| 63 | plugReader=_findReaders('../plugins') |
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| 64 | else: |
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| 65 | if os.path.isdir('..\DataLoader\plugins'): |
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| 66 | os.chdir(os.path.abspath('..\DataLoader\plugins'))# change the current |
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| 67 | #directory to dataLoader\plugins |
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| 68 | plugReader=_findReaders('plugins') |
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| 69 | |
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| 70 | if plugReader !=None: |
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| 71 | for preader in plugReader:# for each modules takes list of extensions |
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| 72 | print preader,preader.ext |
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| 73 | for item in preader.ext: |
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| 74 | ext=item |
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| 75 | if ext not in self.readers:#assign extension with its reader |
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| 76 | self.readers[ext] = [] |
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| 77 | self.readers[ext].insert(0,preader) |
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| 78 | |
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| 79 | #print "plugreader",plugReader |
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| 80 | #print "In setitem",self.readers |
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| 81 | elif reader !=None and ext !=None: |
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| 82 | if ext not in self.readers: |
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| 83 | self.readers[ext] = [] |
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| 84 | self.readers[ext].insert(0,reader) |
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| 85 | elif reader!=None: |
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| 86 | for item in reader.ext: |
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| 87 | ext=item |
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| 88 | if ext not in self.readers:#assign extension with its reader |
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| 89 | self.readers[ext] = [] |
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| 90 | self.readers[ext].insert(0,reader) |
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| 91 | else: |
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| 92 | raise ValueError,"missing reader" |
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| 93 | |
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| 94 | |
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| 95 | def __getitem__(self, ext): |
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| 96 | return self.readers[ext] |
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| 97 | |
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| 98 | def __contains__(self, ext): |
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| 99 | return ext in self.readers |
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| 100 | |
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| 101 | |
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| 102 | def formats(self, name=True, ext=False): |
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| 103 | """ |
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| 104 | Return a list of the registered formats. If name=True then |
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| 105 | named formats are returned. If ext=True then extensions |
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| 106 | are returned. |
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| 107 | """ |
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| 108 | names = [a for a in self.readers.keys() if not a.startswith('.')] |
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| 109 | exts = [a for a in self.readers.keys() if a.startswith('.')] |
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| 110 | names.sort() |
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| 111 | exts.sort() |
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| 112 | ret = [] |
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| 113 | if name: ret += names |
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| 114 | if ext: ret += exts |
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| 115 | return ret |
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| 116 | |
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| 117 | def lookup(self, path): |
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| 118 | """ |
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| 119 | Return the loader associated with the file type of path. |
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| 120 | """ |
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| 121 | file = os.path.basename(path) |
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| 122 | idx = file.find('.') |
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| 123 | ext = file[idx:] if idx >= 0 else '' |
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| 124 | #print "exten",ext |
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| 125 | #print self.readers |
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| 126 | try: |
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| 127 | return self.readers[ext] |
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| 128 | except: |
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| 129 | #raise ValueError, "Unknown file type '%s'"%ext |
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| 130 | print "Unknown file type '%s'"%ext |
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| 131 | |
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| 132 | |
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| 133 | def getAcTReader(self,path): |
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| 134 | return self.reading |
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| 135 | |
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| 136 | def load(self, path, format=None): |
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| 137 | """ |
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| 138 | Call the loader for the file type of path. |
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| 139 | |
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| 140 | Raises ValueError if no loader is available. |
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| 141 | May raise a loader-defined exception if loader fails. |
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| 142 | """ |
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| 143 | try: |
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| 144 | #print "in load",os.path.abspath(path) |
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| 145 | os.path.isfile( os.path.abspath(path)) |
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| 146 | #print "went here in load check path" |
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| 147 | except: |
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| 148 | raise ValueError," file doesn't exist" |
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| 149 | if format is None: |
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| 150 | readers = self.lookup(path) |
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| 151 | else: |
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| 152 | readers = self.readers[format] |
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| 153 | if readers!=None: |
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| 154 | |
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| 155 | for fn in readers: |
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| 156 | try: |
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| 157 | #print "path",os.getcwd( ) |
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| 158 | value=fn.read(path) |
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| 159 | self.reading= fn.__class__ |
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| 160 | return value |
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| 161 | except ValueError,msg: |
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| 162 | print str(msg) |
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| 163 | def __init__(self): |
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| 164 | """ Create singleton instance """ |
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| 165 | # Check whether we already have an instance |
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| 166 | if Loader.__load is None: |
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| 167 | # Create and remember instance |
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| 168 | Loader.__load = Loader.Load() |
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| 169 | Loader.__load.__setitem__() |
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| 170 | # Store instance reference as the only member in the handle |
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| 171 | self.__dict__['_Loader__load'] = Loader.__load |
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| 172 | |
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| 173 | def __getattr__(self, attr): |
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| 174 | """ Delegate access to implementation """ |
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| 175 | return getattr(self.__load, attr) |
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| 176 | |
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| 177 | def __setattr__(self, attr, value): |
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| 178 | """ Delegate access to implementation """ |
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| 179 | return setattr(self.__load, attr, value) |
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