def walk_resource()

in Explode/lambda/explode.py [0:0]

• 28 lines of code
• 9 McCabe index (conditional complexity)

def walk_resource(resource, map_data):
    """Recursively process a resource."""
    new_resource = {}
    for key, value in resource.items():
        if isinstance(value, dict):
            new_resource[key] = walk_resource(value, map_data)
        elif isinstance(value, list):
            new_resource[key] = [walk_resource(x, map_data) for x in value]
        elif isinstance(value, str):
            match = EXPLODE_RE.search(value)
            while match:
                explode_key = match.group('explode_key')
                try:
                    replace_value = map_data[explode_key]
                except KeyError:
                    print("Missing item {} in mapping while processing {}: {}".format(
                        explode_key,
                        key,
                        value))
                if isinstance(replace_value, int):
                    value = replace_value
                    # No further explosion is possible on an int
                    match = None
                else:
                    value = value.replace(match.group(0), replace_value)
                    match = EXPLODE_RE.search(value)
            new_resource[key] = value
        else:
            new_resource[key] = value
    return new_resource