text: from flask_wtf import FlaskForm
  from wtforms import StringField, TextAreaField, BooleanField, SelectField,\
      SubmitField
  from wtforms.validators import DataRequired, Length, Email, Regexp
  from wtforms import ValidationError
  from flask_pagedown.fields import PageDownField
  from ..models import Role, User
  
  
  class NameForm(FlaskForm):
      name = StringField('What is your name?', validators=[DataRequired()])
      submit = SubmitField('Submit')
  
  
  class EditProfileForm(FlaskForm):
      name = StringField('Real name', validators=[Length(0, 64)])
      location = StringField('Location', validators=[Length(0, 64)])
      about_me = TextAreaField('About me')
      submit = SubmitField('Submit')
  
  
  class EditProfileAdminForm(FlaskForm):
      email = StringField('Email', validators=[DataRequired(), Length(1, 64),
                                               Email()])
      username = StringField('Username', validators=[
          DataRequired(), Length(1, 64),
          Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0,
                 'Usernames must have only letters, numbers, dots or '
                 'underscores')])
      confirmed = BooleanField('Confirmed')
      role = SelectField('Role', coerce=int)
      name = StringField('Real name', validators=[Length(0, 64)])
      location = StringField('Location', validators=[Length(0, 64)])
      about_me = TextAreaField('About me')
      submit = SubmitField('Submit')
  
      def __init__(self, user, *args, **kwargs):
          super(EditProfileAdminForm, self).__init__(*args, **kwargs)
          self.role.choices = [(role.id, role.name)
                               for role in Role.query.order_by(Role.name).all()]
          self.user = user
  
      def validate_email(self, field):
          if field.data != self.user.email and \
                  User.query.filter_by(email=field.data).first():
              raise ValidationError('Email already registered.')
  
      def validate_username(self, field):
          if field.data != self.user.username and \
                  User.query.filter_by(username=field.data).first():
              raise ValidationError('Username already in use.')
  
  
  class PostForm(FlaskForm):
      body = PageDownField("What's on your mind?", validators=[DataRequired()])
      submit = SubmitField('Submit')
  