Source Code for Module SCons.Scanner.Dir

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  2  # Copyright (c) 2001 - 2015 The SCons Foundation 
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 22   
 23  __revision__ = "src/engine/SCons/Scanner/Dir.py rel_2.4.1:3453:73fefd3ea0b0 2015/11/09 03:25:05 bdbaddog" 
 24   
 25  import SCons.Node.FS 
 26  import SCons.Scanner 
 27   
 28 -def only_dirs(nodes): 
 29      is_Dir = lambda n: isinstance(n.disambiguate(), SCons.Node.FS.Dir) 
 30      return list(filter(is_Dir, nodes)) 
 31   
 32 -def DirScanner(**kw): 
 33      """Return a prototype Scanner instance for scanning 
 34      directories for on-disk files""" 
 35      kw['node_factory'] = SCons.Node.FS.Entry 
 36      kw['recursive'] = only_dirs 
 37      return SCons.Scanner.Base(scan_on_disk, "DirScanner", **kw) 
 38   
 39 -def DirEntryScanner(**kw): 
 40      """Return a prototype Scanner instance for "scanning" 
 41      directory Nodes for their in-memory entries""" 
 42      kw['node_factory'] = SCons.Node.FS.Entry 
 43      kw['recursive'] = None 
 44      return SCons.Scanner.Base(scan_in_memory, "DirEntryScanner", **kw) 
 45   
 46  skip_entry = {} 
 47   
 48  skip_entry_list = [ 
 49     '.', 
 50     '..', 
 51     '.sconsign', 
 52     # Used by the native dblite.py module. 
 53     '.sconsign.dblite', 
 54     # Used by dbm and dumbdbm. 
 55     '.sconsign.dir', 
 56     # Used by dbm. 
 57     '.sconsign.pag', 
 58     # Used by dumbdbm. 
 59     '.sconsign.dat', 
 60     '.sconsign.bak', 
 61     # Used by some dbm emulations using Berkeley DB. 
 62     '.sconsign.db', 
 63  ] 
 64   
 65  for skip in skip_entry_list: 
 66      skip_entry[skip] = 1 
 67      skip_entry[SCons.Node.FS._my_normcase(skip)] = 1 
 68   
 69  do_not_scan = lambda k: k not in skip_entry 
 70   
 71 -def scan_on_disk(node, env, path=()): 
 72      """ 
 73      Scans a directory for on-disk files and directories therein. 
 74   
 75      Looking up the entries will add these to the in-memory Node tree 
 76      representation of the file system, so all we have to do is just 
 77      that and then call the in-memory scanning function. 
 78      """ 
 79      try: 
 80          flist = node.fs.listdir(node.get_abspath()) 
 81      except (IOError, OSError): 
 82          return [] 
 83      e = node.Entry 
 84      for f in  filter(do_not_scan, flist): 
 85          # Add ./ to the beginning of the file name so if it begins with a 
 86          # '#' we don't look it up relative to the top-level directory. 
 87          e('./' + f) 
 88      return scan_in_memory(node, env, path) 
 89   
 90 -def scan_in_memory(node, env, path=()): 
 91      """ 
 92      "Scans" a Node.FS.Dir for its in-memory entries. 
 93      """ 
 94      try: 
 95          entries = node.entries 
 96      except AttributeError: 
 97          # It's not a Node.FS.Dir (or doesn't look enough like one for 
 98          # our purposes), which can happen if a target list containing 
 99          # mixed Node types (Dirs and Files, for example) has a Dir as 
100          # the first entry. 
101          return [] 
102      entry_list = sorted(filter(do_not_scan, list(entries.keys()))) 
103      return [entries[n] for n in entry_list] 
104   
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