git.gag.com Git - debian/gnuradio/blob - grc/python/Block.py

   1 """
   2 Copyright 2008, 2009 Free Software Foundation, Inc.
   3 This file is part of GNU Radio
   4
   5 GNU Radio Companion is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU General Public License
   7 as published by the Free Software Foundation; either version 2
   8 of the License, or (at your option) any later version.
   9
  10 GNU Radio Companion is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  18 """
  19
  20 from .. base.Block import Block as _Block
  21 from .. gui.Block import Block as _GUIBlock
  22 import extract_docs
  23 import extract_category
  24
  25 class Block(_Block, _GUIBlock):
  26
  27         def is_virtual_sink(self): return self.get_key() == 'virtual_sink'
  28         def is_virtual_source(self): return self.get_key() == 'virtual_source'
  29
  30         ##for make source to keep track of indexes
  31         _source_count = 0
  32         ##for make sink to keep track of indexes
  33         _sink_count = 0
  34
  35         def __init__(self, flow_graph, n):
  36                 """
  37                 Make a new block from nested data.
  38                 @param flow graph the parent element
  39                 @param n the nested odict
  40                 @return block a new block
  41                 """
  42                 #grab the data
  43                 self._doc = n.find('doc') or ''
  44                 self._imports = map(lambda i: i.strip(), n.findall('import'))
  45                 self._make = n.find('make')
  46                 self._var_make = n.find('var_make')
  47                 self._checks = n.findall('check')
  48                 self._callbacks = n.findall('callback')
  49                 #build the block
  50                 _Block.__init__(
  51                         self,
  52                         flow_graph=flow_graph,
  53                         n=n,
  54                 )
  55                 _GUIBlock.__init__(self)
  56
  57         def validate(self):
  58                 """
  59                 Validate this block.
  60                 Call the base class validate.
  61                 Evaluate the checks: each check must evaluate to True.
  62                 """
  63                 _Block.validate(self)
  64                 #evaluate the checks
  65                 for check in self._checks:
  66                         check_res = self.resolve_dependencies(check)
  67                         try:
  68                                 check_eval = self.get_parent().evaluate(check_res)
  69                                 try: assert check_eval
  70                                 except AssertionError: self.add_error_message('Check "%s" failed.'%check)
  71                         except: self.add_error_message('Check "%s" did not evaluate.'%check)
  72
  73         def rewrite(self):
  74                 """
  75                 Add and remove ports to adjust for the nports.
  76                 """
  77                 _Block.rewrite(self)
  78                 #adjust nports
  79                 for get_ports, get_port in (
  80                         (self.get_sources, self.get_source),
  81                         (self.get_sinks, self.get_sink),
  82                 ):
  83                         #how many streaming (non-message) ports?
  84                         num_ports = len(filter(lambda p: p.get_type() != 'msg', get_ports()))
  85                         #do nothing for 0 ports
  86                         if not num_ports: continue
  87                         #get the nports setting
  88                         port0 = get_port(str(0))
  89                         nports = port0.get_nports()
  90                         #do nothing for no nports
  91                         if not nports: continue
  92                         #do nothing if nports is already num ports
  93                         if nports == num_ports: continue
  94                         #remove excess ports and connections
  95                         if nports < num_ports:
  96                                 #remove the connections
  97                                 for key in map(str, range(nports, num_ports)):
  98                                         port = get_port(key)
  99                                         for connection in port.get_connections():
 100                                                 self.get_parent().remove_element(connection)
 101                                 #remove the ports
 102                                 for key in map(str, range(nports, num_ports)):
 103                                         get_ports().remove(get_port(key))
 104                                 continue
 105                         #add more ports
 106                         if nports > num_ports:
 107                                 for key in map(str, range(num_ports, nports)):
 108                                         prev_port = get_port(str(int(key)-1))
 109                                         get_ports().insert(
 110                                                 get_ports().index(prev_port)+1,
 111                                                 prev_port.copy(new_key=key),
 112                                         )
 113                                 continue
 114
 115         def port_controller_modify(self, direction):
 116                 """
 117                 Change the port controller.
 118                 @param direction +1 or -1
 119                 @return true for change
 120                 """
 121                 changed = False
 122                 #concat the nports string from the private nports settings of both port0
 123                 nports_str = \
 124                         (self.get_sinks() and self.get_sinks()[0]._nports or '') + \
 125                         (self.get_sources() and self.get_sources()[0]._nports or '')
 126                 #modify all params whose keys appear in the nports string
 127                 for param in self.get_params():
 128                         if param.is_enum() or param.get_key() not in nports_str: continue
 129                         #try to increment the port controller by direction
 130                         try:
 131                                 value = param.get_evaluated()
 132                                 value = value + direction
 133                                 assert 0 < value
 134                                 param.set_value(value)
 135                                 changed = True
 136                         except: pass
 137                 return changed
 138
 139         def get_doc(self):
 140                 doc = self._doc.strip('\n').replace('\\\n', '')
 141                 #merge custom doc with doxygen docs
 142                 return '\n'.join([doc, extract_docs.extract(self.get_key())]).strip('\n')
 143
 144         def get_category(self):
 145                 category = extract_category.extract(self.get_key())
 146                 #if category: return category
 147                 return _Block.get_category(self)
 148
 149         def get_imports(self):
 150                 """
 151                 Resolve all import statements.
 152                 Split each import statement at newlines.
 153                 Combine all import statments into a list.
 154                 Filter empty imports.
 155                 @return a list of import statements
 156                 """
 157                 return filter(lambda i: i, sum(map(lambda i: self.resolve_dependencies(i).split('\n'), self._imports), []))
 158
 159         def get_make(self): return self.resolve_dependencies(self._make)
 160         def get_var_make(self): return self.resolve_dependencies(self._var_make)
 161
 162         def get_callbacks(self):
 163                 """
 164                 Get a list of function callbacks for this block.
 165                 @return a list of strings
 166                 """
 167                 def make_callback(callback):
 168                         callback = self.resolve_dependencies(callback)
 169                         if 'self.' in callback: return callback
 170                         return 'self.%s.%s'%(self.get_id(), callback)
 171                 return map(make_callback, self._callbacks)