[GRASS-dev] problem with parse_command python

[Luca Delucchi]

2010/12/23 Glynn Clements <glynn at gclements.plus.com>:
>

Hi Glynn, thanks for the answer

> parse_key_val returns a dictionary, so the keys must be unique. If you
> have duplicate keys, only the last value will be returned.
>
> For v.what, you'll need to parse the output yourself.
>

ok, I understood it

> For the future, we should consider fixing v.what to use a sane (i.e.
> non-modal) output format for -g.
>

I try to create a general function for v.what, it return a dictionary
of dictionary

def vector_what(map,x,y):
  """!Return the result of v.what using the map and coordinates passed

  @param map vector map name
  @param x x coordinate
  @param y y coordinate

  @return parsed output in dictionary

  """
  result = {}
  # create string for east_north param
  coor = str(x) + ',' + str(y)

  fields = grass.read_command('v.what',flags = 'a', map = map,
east_north = coor)
  # split the different features
  fields = fields.split('\n\n')
  # value for number of features
  value = 0
  # delete the first block, is only the coordinates to query
  del fields[0]
  # for each block
  for field in fields:
    # create a temporary dictionary
    temp_dic = {}
    # for each block split lines
    lines = field.splitlines()
    # for each line
    for line in lines:
      kv = line.split(':', 1)
      if len(kv) > 1:
	temp_dic[kv[0].strip()] = str(kv[1])
    # this is the firs block it contain general information about map
    if value == 0:
      result['general'] = temp_dic
    # features
    else:
      result['feature'+str(value)] = temp_dic
    value = value + 1
  return result

what do you think? maybe it isn't the best solution but it work fine...
the code is available to be integrated into vector.py

> --
> Glynn Clements <glynn at gclements.plus.com>
>

best regards
Luca