Chevron custom data example

output

  type: dog
  mythical: false
    "An ordinary animal"
  type: kerberos
  mythical: true
    "A truly mythical creature!"

test.py

#!/usr/bin/env python
import chevron

class CustomData(dict):
    class LowercaseBool:
        _CHEVRON_return_scope_when_falsy = True

        def __init__(self, value):
            self.value = value

        def __bool__(self):
            return self.value
        __nonzero__ = __bool__

        def __str__(self):
            if self.value:
                return 'true'
            return 'false'

    def __into_custom(self,item):
        if isinstance(item, dict):
            return CustomData(item)
        if isinstance(item, bool):
            return self.LowercaseBool(item)
        if isinstance(item, list):
            return [self.__into_custom(i) for i in item]
        return item

    def __getitem__(self, key):
        item = dict.__getitem__(self, key)

        return self.__into_custom(item)


data = {
    "entities": [
        {
            "type": "dog",
            "mythical": False
        },{
            "type": "kerberos",
            "mythical": True
        }
    ],
    "this_is_null": None
}

template = '''\
{{#entities}}
  type: {{type}}
  mythical: {{mythical}}
  {{#mythical}}
    "A truly mythical creature!"
    {{/mythical}}
    {{^mythical}}
    "An ordinary animal"
  {{/mythical}}
{{/entities}}
'''


data = CustomData(data)
print(chevron.render(template, data))