form的valid驗證的原理

import re

import copy
class
validateerror(exception):
def __init__(self,detail):
self.detail =detail
# ###################### 外掛程式
class textinput(object
):    def __str__(self):
return""
class emailinput(object
):    def __str__(self):
return""
# ###################### 內部包含正則，用於驗證
class field(object
):    def __init__(self,required=true,error_messages=none,widget=none):
self.required =required
self.error_messages =error_messages
ifnot widget:
self.widget =textinput()
else
:            self.widget =widget
def __str__(self):
return
str(self.widget)
class
charfield(field):
def valid(self,val):
ifself.required:
ifnot val:
msg = self.error_messages['
required']
raise validateerror(msg)
return
valclass
emailfield(field):
reg = "
^\w+@\w+$
"def valid(self,val):
ifself.required:
ifnot val:
msg = self.error_messages['
required']
raise validateerror(msg)
result =re.match(self.reg,val)
ifnot result:
msg = self.error_messages.get('
invalid
','格式錯誤')
raise validateerror(msg)
return
val# ###################### form，獲取使用者提交內容+獲取定義的字段物件
class form(object
):    def __init__(self,data=none):
# 獲取派生類中的所有靜態字段
# print(self.__class__.__dict__)
self.data =data
self.fields =copy.deepcopy(self.__class__.declare_field)
self.cleaned_data ={}
self.errors ={}
def __new__(cls, *args, **kwargs):
declare_field ={}
for field_name, field in
cls.__dict__.items():
ifisinstance(field,field):
declare_field[field_name] =field
cls.declare_field =declare_field
return
object
.__new__(cls)
def is_valid(self):
# 使用者提交的資料
# self.data # 
# self.fields # 
for field_name,filed in
self.fields.items():
try:
input_val = self.data.get
(field_name)
val =filed.valid(input_val)
method = getattr(self,"
cleaned_%s
" %field_name,none)
ifmethod:
val =method(val)
self.cleaned_data[field_name] =val
except validateerror 
ase:
self.errors[field_name] =e.detail
return len(self.errors) == 0
def __iter__(self):
return
iter(self.fields.values())
class
userform(form):
username = charfield(error_messages=,widget=textinput())
pwd = emailfield(error_messages=,widget=emailinput())
# ############### 應用
obj = userform(data=)
ifobj.is_valid():
print(
'驗證成功
',obj.cleaned_data)
else
:    print(
"驗證失敗
",obj.errors)
# ##################### html #####################
for x in
obj:
print(x)

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