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interfaces.py
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72 lines (54 loc) · 2.02 KB
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"""
Interfaces for FormEncode (for documentation purposes only)
"""
class Attribute:
def __init__(self, description, name=None):
self.description = description
self.name = name
class Interface:
pass
class IDeclarative(Interface):
def __init__(**kw):
"""
Instantiates this class with all the keywords being used to
update the instance variables.
"""
def __call__(**kw):
"""
Returns a copy with all attributes using the given keywords,
being updated.
"""
class IValidator(IDeclarative):
messages = Attribute("""
A dictionary of messages (with formatting strings) for error
responses""", name='messages')
if_missing = Attribute("""
If the source that this validator would handle is missing (e.g.,
a field that was not specified), use this value. If
Validator.NoDefault, then if the field is missing an exception
should be raised.""", name='ifMissing')
repeating = Attribute("""
A boolean; this object accepts lists if true, subvalidators can be
found in the validators attribute.""", name='repeating')
compound = Attribute("""
A boolean; this object has a dictionary of validators if this is
true, subvalidators can be found in the field attribute (a
dictionary).""", name='compound')
def to_python(value, state=None):
"""
Convert `value` from its foreign representation to its Python
representation. `state` is for application-specific hooks.
"""
def from_python(value, state=None):
"""
Convert `value` from its Python representation to the foreign
representation. `state` is for application-specific hooks.
"""
def message(name, default):
"""
Return the message (from the `messages` attribute) that goes
with `name`, or return default if `name` not found `default`.
"""
class ISchema(IValidator):
fields = Attribute('A dictionary of (field name: validator)',
name='fields')