60 lines
1.8 KiB
Python
60 lines
1.8 KiB
Python
"""YAML fields"""
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import yaml
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from django import forms
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from django.utils.translation import gettext_lazy as _
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class InvalidYAMLInput(str):
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"""Invalid YAML String type"""
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class YAMLString(str):
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"""YAML String type"""
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class YAMLField(forms.CharField):
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"""Django's JSON Field converted to YAML"""
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default_error_messages = {
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"invalid": _("'%(value)s' value must be valid YAML."),
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}
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widget = forms.Textarea
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def to_python(self, value):
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if self.disabled:
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return value
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if value in self.empty_values:
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return None
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if isinstance(value, (list, dict, int, float, YAMLString)):
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return value
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try:
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converted = yaml.safe_load(value)
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except yaml.YAMLError:
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raise forms.ValidationError(
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self.error_messages["invalid"], code="invalid", params={"value": value},
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)
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if isinstance(converted, str):
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return YAMLString(converted)
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return converted
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def bound_data(self, data, initial):
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if self.disabled:
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return initial
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try:
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return yaml.safe_load(data)
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except yaml.YAMLError:
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return InvalidYAMLInput(data)
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def prepare_value(self, value):
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if isinstance(value, InvalidYAMLInput):
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return value
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return yaml.dump(value, explicit_start=True, default_flow_style=False)
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def has_changed(self, initial, data):
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if super().has_changed(initial, data):
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return True
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# For purposes of seeing whether something has changed, True isn't the
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# same as 1 and the order of keys doesn't matter.
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data = self.to_python(data)
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return yaml.dump(initial, sort_keys=True) != yaml.dump(data, sort_keys=True)
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