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base.py
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base.py
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import json
from base64 import b64encode
from datetime import date, time, datetime
from .._compat import PY2, integer_types, to_unicode, to_bytes, basestring
from ..adapters.base import SQLAdapter, NoSQLAdapter
from ..helpers.classes import Reference, SQLCustomType
from ..helpers.methods import bar_encode
from ..helpers.serializers import serializers
from ..objects import Row, Expression, Field
from . import Representer, representers, for_type, before_type, for_instance, pre
long = integer_types[-1]
NoneType = type(None)
class BaseRepresenter(Representer):
@for_type("boolean", adapt=False)
def _boolean(self, value):
if value and not str(value)[:1].upper() in "0F":
return self.adapter.smart_adapt(self.dialect.true)
return self.adapter.smart_adapt(self.dialect.false)
@for_type("id", adapt=False)
def _id(self, value):
return str(long(value))
@for_type("integer", adapt=False)
def _integer(self, value):
return str(long(value))
@for_type("decimal", adapt=False)
def _decimal(self, value):
return str(value)
@for_type("double", adapt=False)
def _double(self, value):
return repr(float(value))
@for_type("date", encode=True)
def _date(self, value):
if isinstance(value, (date, datetime)):
return value.isoformat()[:10]
return str(value)
@for_type("time", encode=True)
def _time(self, value):
if isinstance(value, time):
return value.isoformat()[:10]
return str(value)
@for_type("datetime", encode=True)
def _datetime(self, value):
if isinstance(value, datetime):
value = value.isoformat(self.dialect.dt_sep)[:19]
elif isinstance(value, date):
value = value.isoformat()[:10] + self.dialect.dt_sep + "00:00:00"
else:
value = str(value)
return value
def _ensure_list(self, value):
if not value:
value = []
elif not isinstance(value, (list, tuple)):
value = [value]
return value
def _listify_elements(self, elements):
return bar_encode(elements)
@for_type("list:integer")
def _list_integer(self, value):
values = self._ensure_list(value)
values = [int(val) for val in values if val != ""]
return self._listify_elements(values)
@for_type("list:string")
def _list_string(self, value):
value = self._ensure_list(value)
if PY2:
try:
value = map(str, value)
except:
value = map(lambda x: unicode(x).encode(self.adapter.db_codec), value)
else:
value = list(map(str, value))
return self._listify_elements(value)
@for_type("list:reference", adapt=False)
def _list_reference(self, value):
return self.registered_t["list:integer"](value, "list:reference")
class JSONRepresenter(Representer):
@for_type("json", encode=True)
def _json(self, value):
return serializers.json(value)
@representers.register_for(SQLAdapter)
class SQLRepresenter(BaseRepresenter):
def _custom_type(self, value, field_type):
value = field_type.encoder(value)
if value and field_type.type in ("string", "text", "json"):
return self.adapter.adapt(value)
return value or "NULL"
@pre()
def _before_all(self, obj, field_type):
if isinstance(field_type, SQLCustomType):
return self._custom_type(obj, field_type)
if obj == "" and not field_type[:2] in ("st", "te", "js", "pa", "up"):
return "NULL"
r = self.exceptions(obj, field_type)
return r
def exceptions(self, obj, field_type):
return None
@for_instance(NoneType)
def _none(self, value, field_type):
return "NULL"
@for_instance(Expression)
def _expression(self, value, field_type):
return str(value)
@for_instance(Field)
def _fieldexpr(self, value, field_type):
return str(value)
@before_type("reference")
def reference_extras(self, field_type):
return {"referenced": field_type[9:].strip()}
@for_type("reference", adapt=False)
def _reference(self, value, referenced):
if referenced in self.adapter.db.tables:
return str(long(value))
p = referenced.partition(".")
if p[2] != "":
try:
ftype = self.adapter.db[p[0]][p[2]].type
return self.adapter.represent(value, ftype)
except (ValueError, KeyError):
return repr(value)
elif isinstance(value, (Row, Reference)):
return str(value["id"])
return str(long(value))
@for_type("blob", encode=True)
def _blob(self, value):
return b64encode(to_bytes(value))
@representers.register_for(NoSQLAdapter)
class NoSQLRepresenter(BaseRepresenter):
def adapt(self, value):
return value
@pre(is_breaking=True)
def _before_all(self, obj, field_type):
if isinstance(field_type, SQLCustomType):
return True, field_type.encoder(obj)
return False, obj
@pre(is_breaking=True)
def _nullify_empty_string(self, obj, field_type):
if obj == "" and not (
isinstance(field_type, str) and field_type[:2] in ("st", "te", "pa", "up")
):
return True, None
return False, obj
@for_instance(NoneType)
def _none(self, value, field_type):
return None
@for_instance(list, repr_type=True)
def _repr_list(self, value, field_type):
if isinstance(field_type, str) and not field_type.startswith("list:"):
return [self.adapter.represent(v, field_type) for v in value]
return value
@for_type("id")
def _id(self, value):
return long(value)
@for_type("integer")
def _integer(self, value):
return long(value)
@for_type("bigint")
def _bigint(self, value):
return long(value)
@for_type("double")
def _double(self, value):
return float(value)
@for_type("reference")
def _reference(self, value):
if isinstance(value, (Row, Reference)):
value = value["id"]
return long(value)
@for_type("boolean")
def _boolean(self, value):
if not isinstance(value, bool):
if value and not str(value)[:1].upper() in "0F":
return True
return False
return value
@for_type("string")
def _string(self, value):
return to_unicode(value)
@for_type("password")
def _password(self, value):
return to_unicode(value)
@for_type("text")
def _text(self, value):
return to_unicode(value)
@for_type("blob")
def _blob(self, value):
return value
@for_type("json")
def _json(self, value):
if isinstance(value, basestring):
value = to_unicode(value)
value = json.loads(value)
return value
def _represent_list(self, value):
items = self._ensure_list(value)
return [item for item in items if item is not None]
@for_type("date")
def _date(self, value):
if not isinstance(value, date):
(y, m, d) = map(int, str(value).strip().split("-"))
value = date(y, m, d)
elif isinstance(value, datetime):
(y, m, d) = (value.year, value.month, value.day)
value = date(y, m, d)
return value
@for_type("time")
def _time(self, value):
if not isinstance(value, time):
time_items = list(map(int, str(value).strip().split(":")[:3]))
if len(time_items) == 3:
(h, mi, s) = time_items
else:
(h, mi, s) = time_items + [0]
value = time(h, mi, s)
return value
@for_type("datetime")
def _datetime(self, value):
if not isinstance(value, datetime):
svalue = str(value)[:19]
(y, m, d) = map(int, svalue[:10].strip().split("-"))
tp = svalue[11:].strip().split(":")[:3]
while len(tp) < 3:
tp.append(0)
(h, mi, s) = map(int, tp)
value = datetime(y, m, d, h, mi, s)
return value
@for_type("list:integer")
def _list_integer(self, value):
values = self._represent_list(value)
return list(map(int, values))
@for_type("list:string")
def _list_string(self, value):
values = self._represent_list(value)
return list(map(to_unicode, values))
@for_type("list:reference")
def _list_reference(self, value):
values = self._represent_list(value)
return list(map(long, values))