web2py.gluon.serializers

Package web2py :: Package gluon :: Module serializers |
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# Source Code for Module web2py.gluon.serializers

     1  """
     2  This file is part of the web2py Web Framework
     3  Copyrighted by Massimo Di Pierro <mdipierro@cs.depaul.edu>
     4  License: LGPLv3 (http://www.gnu.org/licenses/lgpl.html)
     5  """
     6  import datetime
     7  from storage import Storage
     8  from html import TAG
     9  from html import xmlescape
    10  from languages import lazyT
    11  import contrib.rss2 as rss2
    12
    13  try:
    14      import json as json_parser                      # try stdlib (Python 2.6)
    15  except ImportError:
    16      try:
    17          import simplejson as json_parser            # try external module
    18      except:
    19          import contrib.simplejson as json_parser    # fallback to pure-Python module
    20
    21 -def custom_json(o):
    22      if hasattr(o,'custom_json') and callable(o.custom_json):
    23          return o.custom_json()
    24      if isinstance(o, (datetime.date,
    25                        datetime.datetime,
    26                        datetime.time)):
    27          return o.isoformat()[:19].replace('T',' ')
    28      elif isinstance(o, (int, long)):
    29          return int(o)
    30      elif isinstance(o, lazyT):
    31          return str(o)
    32      elif hasattr(o,'as_list') and callable(o.as_list):
    33          return o.as_list()
    34      elif hasattr(o,'as_dict') and callable(o.as_dict):
    35          return o.as_dict()
    36      else:
    37          raise TypeError(repr(o) + " is not JSON serializable")
    38
    39
    40 -def xml_rec(value, key, quote=True):
    41      if hasattr(value,'custom_xml') and callable(value.custom_xml):
    42          return value.custom_xml()
    43      elif isinstance(value, (dict, Storage)):
    44          return TAG[key](*[TAG[k](xml_rec(v, '',quote)) \
    45                                for k, v in value.items()])
    46      elif isinstance(value, list):
    47          return TAG[key](*[TAG.item(xml_rec(item, '',quote)) for item in value])
    48      elif hasattr(value,'as_list') and callable(value.as_list):
    49          return str(xml_rec(value.as_list(),'',quote))
    50      elif hasattr(value,'as_dict') and callable(value.as_dict):
    51          return str(xml_rec(value.as_dict(),'',quote))
    52      else:
    53          return xmlescape(value,quote)
    54
    55
    56 -def xml(value, encoding='UTF-8', key='document', quote=True):
    57      return ('<?xml version="1.0" encoding="%s"?>' % encoding) + str(xml_rec(value,key,quote))
    58
    59
    60 -def json(value,default=custom_json):
    61      return json_parser.dumps(value,default=default)
    62
    63
    64 -def csv(value):
    65      return ''
    66
    67
    68 -def rss(feed):
    69      if not 'entries' in feed and 'items' in feed:
    70          feed['entries'] = feed['items']
    71      now=datetime.datetime.now()
    72      rss = rss2.RSS2(title = feed['title'],
    73                      link = str(feed['link']),
    74                      description = feed['description'],
    75                      lastBuildDate = feed.get('created_on', now),
    76                      items = [rss2.RSSItem(\
    77                                          title=entry['title'],
    78                                          link=str(entry['link']),
    79                                          description=entry['description'],
    80                                          pubDate=entry.get('created_on', now)
    81                                          )\
    82                                      for entry in feed['entries']
    83                                      ]
    84                      )
    85      return rss2.dumps(rss)
    86