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Filename : m_list.py
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# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

DEF_MERGE_TYPE = "replace"
MERGE_TYPES = ("append", "prepend", DEF_MERGE_TYPE, "no_replace")


def _has_any(what, *keys):
    for k in keys:
        if k in what:
            return True
    return False


class Merger:
    def __init__(self, merger, opts):
        self._merger = merger
        # Affects merging behavior...
        self._method = DEF_MERGE_TYPE
        for m in MERGE_TYPES:
            if m in opts:
                self._method = m
                break
        # Affect how recursive merging is done on other primitives
        self._recurse_str = _has_any(opts, "recurse_str")
        self._recurse_dict = _has_any(opts, "recurse_dict")
        self._recurse_array = _has_any(opts, "recurse_array", "recurse_list")

    def __str__(self):
        return (
            "ListMerger: (method=%s,recurse_str=%s,"
            "recurse_dict=%s,recurse_array=%s)"
            % (
                self._method,
                self._recurse_str,
                self._recurse_dict,
                self._recurse_array,
            )
        )

    def _on_tuple(self, value, merge_with):
        return tuple(self._on_list(list(value), merge_with))

    def _on_list(self, value, merge_with):
        if self._method == "replace" and not isinstance(
            merge_with, (tuple, list)
        ):
            return merge_with

        # Ok we now know that what we are merging with is a list or tuple.
        merged_list = []
        if self._method == "prepend":
            merged_list.extend(merge_with)
            merged_list.extend(value)
            return merged_list
        elif self._method == "append":
            merged_list.extend(value)
            merged_list.extend(merge_with)
            return merged_list

        def merge_same_index(old_v, new_v):
            if self._method == "no_replace":
                # Leave it be...
                return old_v
            if isinstance(new_v, (list, tuple)) and self._recurse_array:
                return self._merger.merge(old_v, new_v)
            if isinstance(new_v, str) and self._recurse_str:
                return self._merger.merge(old_v, new_v)
            if isinstance(new_v, (dict)) and self._recurse_dict:
                return self._merger.merge(old_v, new_v)
            return new_v

        # Ok now we are replacing same indexes
        merged_list.extend(value)
        common_len = min(len(merged_list), len(merge_with))
        for i in range(common_len):
            merged_list[i] = merge_same_index(merged_list[i], merge_with[i])
        return merged_list