"""
Form-based method objects.
This module contains support for descriptive method signatures that can be used
to format methods. Currently this is only used by woven.
"""
import calendar
class FormException(Exception):
"""An error occurred calling the form method.
"""
def __init__(self, *args, **kwargs):
Exception.__init__(self, *args)
self.descriptions = kwargs
class InputError(FormException):
"""
An error occurred with some input.
"""
class Argument:
"""Base class for form arguments."""
defaultDefault = None
def __init__(self, name, default=None, shortDesc=None,
longDesc=None, hints=None, allowNone=1):
self.name = name
self.allowNone = allowNone
if default is None:
default = self.defaultDefault
self.default = default
self.shortDesc = shortDesc
self.longDesc = longDesc
if not hints:
hints = {}
self.hints = hints
def addHints(self, **kwargs):
self.hints.update(kwargs)
def getHint(self, name, default=None):
return self.hints.get(name, default)
def getShortDescription(self):
return self.shortDesc or self.name.capitalize()
def getLongDescription(self):
return self.longDesc or ''
def coerce(self, val):
"""Convert the value to the correct format."""
raise NotImplementedError, "implement in subclass"
class String(Argument):
"""A single string.
"""
defaultDefault = ''
min = 0
max = None
def __init__(self, name, default=None, shortDesc=None,
longDesc=None, hints=None, allowNone=1, min=0, max=None):
Argument.__init__(self, name, default=default, shortDesc=shortDesc,
longDesc=longDesc, hints=hints, allowNone=allowNone)
self.min = min
self.max = max
def coerce(self, val):
s = str(val)
if len(s) < self.min:
raise InputError, "Value must be at least %s characters long" % self.min
if self.max != None and len(s) > self.max:
raise InputError, "Value must be at most %s characters long" % self.max
return str(val)
class Text(String):
"""A long string.
"""
class Password(String):
"""A string which should be obscured when input.
"""
class VerifiedPassword(String):
"""A string that should be obscured when input and needs verification."""
def coerce(self, vals):
if len(vals) != 2 or vals[0] != vals[1]:
raise InputError, "Please enter the same password twice."
s = str(vals[0])
if len(s) < self.min:
raise InputError, "Value must be at least %s characters long" % self.min
if self.max != None and len(s) > self.max:
raise InputError, "Value must be at most %s characters long" % self.max
return s
class Hidden(String):
"""A string which is not displayed.
The passed default is used as the value.
"""
class Integer(Argument):
"""A single integer.
"""
defaultDefault = None
def __init__(self, name, allowNone=1, default=None, shortDesc=None,
longDesc=None, hints=None):
Argument.__init__(self, name, default, shortDesc, longDesc, hints,
allowNone)
def coerce(self, val):
if not val.strip() and self.allowNone:
return None
try:
return int(val)
except ValueError:
raise InputError, "%s is not valid, please enter a whole number, e.g. 10" % val
class IntegerRange(Integer):
def __init__(self, name, min, max, allowNone=1, default=None, shortDesc=None,
longDesc=None, hints=None):
self.min = min
self.max = max
Integer.__init__(self, name, allowNone=allowNone, default=default, shortDesc=shortDesc,
longDesc=longDesc, hints=hints)
def coerce(self, val):
result = Integer.coerce(self, val)
if self.allowNone and result == None:
return result
if result < self.min:
raise InputError, "Value %s is too small, is should be at least %s" % (result, self.min)
if result > self.max:
raise InputError, "Value %s is too large, it should be at most %s" % (result, self.max)
return result
class Float(Argument):
defaultDefault = None
def __init__(self, name, allowNone=1, default=None, shortDesc=None,
longDesc=None, hints=None):
Argument.__init__(self, name, default, shortDesc, longDesc, hints,
allowNone)
def coerce(self, val):
if not val.strip() and self.allowNone:
return None
try:
return float(val)
except ValueError:
raise InputError, "Invalid float: %s" % val
class Choice(Argument):
"""
The result of a choice between enumerated types. The choices should
be a list of tuples of tag, value, and description. The tag will be
the value returned if the user hits "Submit", and the description
is the bale for the enumerated type. default is a list of all the
values (seconds element in choices). If no defaults are specified,
initially the first item will be selected. Only one item can (should)
be selected at once.
"""
def __init__(self, name, choices=[], default=[], shortDesc=None,
longDesc=None, hints=None, allowNone=1):
self.choices = choices
if choices and not default:
default.append(choices[0][1])
Argument.__init__(self, name, default, shortDesc, longDesc, hints, allowNone=allowNone)
def coerce(self, inIdent):
for ident, val, desc in self.choices:
if ident == inIdent:
return val
else:
raise InputError("Invalid Choice: %s" % inIdent)
class Flags(Argument):
"""
The result of a checkbox group or multi-menu. The flags should be a
list of tuples of tag, value, and description. The tag will be
the value returned if the user hits "Submit", and the description
is the bale for the enumerated type. default is a list of all the
values (second elements in flags). If no defaults are specified,
initially nothing will be selected. Several items may be selected at
once.
"""
def __init__(self, name, flags=(), default=(), shortDesc=None,
longDesc=None, hints=None, allowNone=1):
self.flags = flags
Argument.__init__(self, name, default, shortDesc, longDesc, hints, allowNone=allowNone)
def coerce(self, inFlagKeys):
if not inFlagKeys:
return []
outFlags = []
for inFlagKey in inFlagKeys:
for flagKey, flagVal, flagDesc in self.flags:
if inFlagKey == flagKey:
outFlags.append(flagVal)
break
else:
raise InputError("Invalid Flag: %s" % inFlagKey)
return outFlags
class CheckGroup(Flags):
pass
class RadioGroup(Choice):
pass
class Boolean(Argument):
def coerce(self, inVal):
if not inVal:
return 0
lInVal = str(inVal).lower()
if lInVal in ('no', 'n', 'f', 'false', '0'):
return 0
return 1
class File(Argument):
def __init__(self, name, allowNone=1, shortDesc=None, longDesc=None,
hints=None):
self.allowNone = allowNone
Argument.__init__(self, name, None, shortDesc, longDesc, hints)
def coerce(self, file):
if not file and self.allowNone:
return None
elif file:
return file
else:
raise InputError, "Invalid File"
def positiveInt(x):
x = int(x)
if x <= 0: raise ValueError
return x
class Date(Argument):
"""A date -- (year, month, day) tuple."""
defaultDefault = None
def __init__(self, name, allowNone=1, default=None, shortDesc=None,
longDesc=None, hints=None):
Argument.__init__(self, name, default, shortDesc, longDesc, hints)
self.allowNone = allowNone
if not allowNone:
self.defaultDefault = (1970, 1, 1)
def coerce(self, args):
"""Return tuple of ints (year, month, day)."""
if tuple(args) == ("", "", "") and self.allowNone:
return None
try:
year, month, day = map(positiveInt, args)
except ValueError:
raise InputError, "Invalid date"
if (month, day) == (2, 29):
if not calendar.isleap(year):
raise InputError, "%d was not a leap year" % year
else:
return year, month, day
try:
mdays = calendar.mdays[month]
except IndexError:
raise InputError, "Invalid date"
if day > mdays:
raise InputError, "Invalid date"
return year, month, day
class Submit(Choice):
"""Submit button or a reasonable facsimile thereof."""
def __init__(self, name, choices=[("Submit", "submit", "Submit form")],
reset=0, shortDesc=None, longDesc=None, allowNone=0, hints=None):
Choice.__init__(self, name, choices=choices, shortDesc=shortDesc,
longDesc=longDesc, hints=hints)
self.allowNone = allowNone
self.reset = reset
def coerce(self, value):
if self.allowNone and not value:
return None
else:
return Choice.coerce(self, value)
class PresentationHint:
"""
A hint to a particular system.
"""
class MethodSignature:
def __init__(self, *sigList):
"""
"""
self.methodSignature = sigList
def getArgument(self, name):
for a in self.methodSignature:
if a.name == name:
return a
def method(self, callable, takesRequest=False):
return FormMethod(self, callable, takesRequest)
class FormMethod:
"""A callable object with a signature."""
def __init__(self, signature, callable, takesRequest=False):
self.signature = signature
self.callable = callable
self.takesRequest = takesRequest
def getArgs(self):
return tuple(self.signature.methodSignature)
def call(self,*args,**kw):
return self.callable(*args,**kw)