Author: ianb
Date: 2007-12-30 11:30:28 -0700 (Sun, 30 Dec 2007)
New Revision: 3185
Modified:
FormEncode/trunk/docs/news.txt
FormEncode/trunk/formencode/schema.py
FormEncode/trunk/tests/test_doctests.py
Log:
Added SimpleFormValidator
Modified: FormEncode/trunk/docs/news.txt
===================================================================
--- FormEncode/trunk/docs/news.txt 2007-12-26 12:31:08 UTC (rev 3184)
+++ FormEncode/trunk/docs/news.txt 2007-12-30 18:30:28 UTC (rev 3185)
@@ -3,6 +3,12 @@
.. contents::
+svn trunk
+---------
+
+* Added ``formencode.schema.SimpleFormValidator``, which wraps a
+ simple function to make it a validator.
+
0.9
---
Modified: FormEncode/trunk/formencode/schema.py
===================================================================
--- FormEncode/trunk/formencode/schema.py 2007-12-26 12:31:08 UTC (rev
3184)
+++ FormEncode/trunk/formencode/schema.py 2007-12-30 18:30:28 UTC (rev
3185)
@@ -382,3 +382,75 @@
item = merge_values(l1item, l2item)
result.append(item)
return result
+
+class SimpleFormValidator(FancyValidator):
+ """
+ This validator wraps a simple function that validates the form.
+
+ The function looks something like this::
+
+ >>> def validate(form_values, state, validator):
+ ... if form_values.get('country', 'US') == 'US':
+ ... if not form_values.get('state'):
+ ... return {'state': 'You must enter a state'}
+ ... if not form_values.get('country'):
+ ... form_values['country'] = 'US'
+
+ This tests that the field 'state' must be filled in if the country
+ is US, and defaults that country value to 'US'. The ``validator``
+ argument is the SimpleFormValidator instance, which you can use to
+ format messages or keep configuration state in if you like (for
+ simple ad hoc validation you are unlikely to need it).
+
+ To create a validator from that function, you would do::
+
+ >>> from formencode.schema import SimpleFormValidator
+ >>> validator = SimpleFormValidator(validate)
+ >>> validator.to_python({'country': 'US', 'state': ''}, None)
+ Traceback (most recent call last):
+ ...
+ Invalid: state: You must enter a state
+ >>> validator.to_python({'state': 'IL'}, None)
+ {'country': 'US', 'state': 'IL'}
+
+ The validate function can either return a single error message
+ (that applies to the whole form), a dictionary that applies to the
+ fields, None which means the form is valid, or it can raise
+ Invalid.
+
+ Note that you may update the value_dict *in place*, but you cannot
+ return a new value.
+
+ Another way to instantiate a validator is like this::
+
+ >>> @SimpleFormValidator.decorate()
+ ... def MyValidator(value_dict, state):
+ ... return None # or some more useful validation
+
+ After this ``MyValidator`` will be a ``SimpleFormValidator``
+ instance (it won't be your function).
+ """
+
+ __unpackargs__ = ('func',)
+
+ def to_python(self, value_dict, state):
+ errors = self.func(value_dict, state, self)
+ if not errors:
+ return value_dict
+ if isinstance(errors, basestring):
+ raise Invalid(errors, value_dict, state)
+ elif isinstance(errors, dict):
+ raise Invalid(format_compound_error(errors),
+ value_dict, state, error_dict=errors)
+ elif isinstance(errors, Invalid):
+ raise errors
+ else:
+ raise TypeError(
+ "Invalid error value: %r" % errors)
+
+ def decorate(cls, **kw):
+ def decorator(func):
+ return cls(func, **kw)
+ return decorator
+
+ decorate = classmethod(decorate)
Modified: FormEncode/trunk/tests/test_doctests.py
===================================================================
--- FormEncode/trunk/tests/test_doctests.py 2007-12-26 12:31:08 UTC (rev
3184)
+++ FormEncode/trunk/tests/test_doctests.py 2007-12-30 18:30:28 UTC (rev
3185)
@@ -21,7 +21,8 @@
]
from formencode import validators
-modules = [validators]
+from formencode import schema
+modules = [validators, schema]
if __name__ == '__main__':
import sys
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