Float validator fails on more that 3 digits after decimal separator

[hvelarde]

I have a couple of fields defined this way:

class IPin(model.Schema):
    """A Pin."""
    ...
    latitude = schema.Float(
        title=_(u'label_latitude', default=u'Latitude'),
        required=True,
        default=0.0,
    )

    longitude = schema.Float(
        title=_(u'label_longitude', default=u'Longitude'),
        required=True,
        default=0.0,
    )

the validator accepts a number like -12,345 but fails with something like -12,3456 with:

The entered value is not a valid decimal literal.

[rodfersou]

This is the way the validation works now:

• Plone javascript makes an ajax request to validate the field (Products.CMFPlone).
• This view (plone.app.z3cform) calls form extractData method (plone.app.z3cform).
• What calls widget extract method (z3c.form).
• Widget tries to convert the data into the value (z3c.form).
• In our case the converter is set to float type (z3c.form) and parsed by (z3c.form) the formatter (z3c.form).
• The formatter is defined in zope.i18n and this is the original exception:

ipdb> value
u'400,5540'
ipdb> self.type
<type 'float'>
ipdb> self.formatter.parse(value)
*** NumberParseError: Not a valid number for this pattern u'#,##0.###;-#,##0.###'.

The generated regex is wrong, float type can have 53 bits of precision instead of just 3.