6.19.10.2.21. Tangler Constructors

   897: #line 1193 "input_frame.ipk"
   898:   def data_output(self,f): return self.tangler(f,'data')
   899:   def c_output(self,f): return self.tangler(f,'c')
   900:   def cpp_output(self,f): return self.tangler(f,'cpp')
   901:   def python_output(self,f): return self.tangler(f,'python')
   902:   def perl_output(self,f): return self.tangler(f,'perl')
   903: 
   904:   # temporarily, we'll use a data tangler
   905:   def interscript_output(self,f):
   906:     filename = self.master.tangler_directory+f
   907:     sink = named_file_sink(self.pass_frame,filename,self.master.tangler_prefix)
   908:     return self.tangler(sink,'data')
   909: 
   910:   def tangler(self,device, language=deduce, *args, **kwds):
   911:     "Create a tangle object from a dvice specification (either a filename or sink object"
   912:     if has_protocol(device, 'filename'):
   913:       filename = self.master.tangler_directory+str(device)
   914:       sink = named_file_sink(
   915:         self.pass_frame,
   916:         filename,
   917:         self.master.tangler_prefix)
   918:     elif has_protocol(device, 'sink'):
   919:       sink = device
   920:     else: raise TypeError,'tangler device argument must be string or sink'
   921: 
   922:     if language is None: language = 'data'
   923:     if language is deduce:
   924:       try:
   925:         splitup = string.split(sink.name,'.')
   926:         if len(splitup)>1:
   927:           extension = splitup[-1]
   928:           language = extension_table [extension]
   929:         else: language = 'data'
   930:       except KeyError: language = 'data'
   931:       except IndexError: language = 'data'
   932:     language = string.lower(language)
   933:     language = string.replace(language,'++','pp') # C++ hack
   934:     language = string.replace(language,'-','_') # obj-C etc
   935: 
   936:     try:
   937:       import imp
   938:       import interscript.tanglers
   939:       file,filename,path = imp.find_module(language,interscript.tanglers.__path__)
   940:       tmod = imp.load_module(language,file,filename,path)
   941:       tglr = eval("tmod."+language+"_tangler")
   942:       t = tglr(sink,self.current_weaver)
   943:     except:
   944:       print 'Unable to load',language,'tangler: using data'
   945:       t=data_tangler(sink,self.current_weaver)
   946:     return t
   947: