mwparserfromhell/mwparserfromhell/utils.py

# -*- coding: utf-8  -*-
#
# Copyright (C) 2012-2013 Ben Kurtovic <ben.kurtovic@verizon.net>
#
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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"""
This module contains accessory functions that wrap around existing ones to
provide additional functionality.
"""

from __future__ import unicode_literals

from .compat import bytes, str
from .nodes import Node
from .smart_list import SmartList

__all__ = ["parse_anything"]

def parse_anything(value, context=0):
    """Return a :py:class:`~.Wikicode` for *value*, allowing multiple types.

    This differs from :py:meth:`.Parser.parse` in that we accept more than just
    a string to be parsed. Unicode objects (strings in py3k), strings (bytes in
    py3k), integers (converted to strings), ``None``, existing
    :py:class:`~.Node` or :py:class:`~.Wikicode` objects, as well as an
    iterable of these types, are supported. This is used to parse input
    on-the-fly by various methods of :py:class:`~.Wikicode` and others like
    :py:class:`~.Template`, such as :py:meth:`wikicode.insert()
    <.Wikicode.insert>` or setting :py:meth:`template.name <.Template.name>`.

    If given, *context* will be passed as a starting context to the parser.
    This is helpful when this function is used inside node attribute setters.
    For example, :py:class:`~.ExternalLink`\ 's :py:attr:`~.ExternalLink.url`
    setter sets *context* to :py:mod:`contexts.EXT_LINK_URI <.contexts>` to
    prevent the URL itself from becoming an :py:class:`~.ExternalLink`.
    """
    from .parser import Parser
    from .wikicode import Wikicode

    if isinstance(value, Wikicode):
        return value
    elif isinstance(value, Node):
        return Wikicode(SmartList([value]))
    elif isinstance(value, str):
        return Parser().parse(value, context)
    elif isinstance(value, bytes):
        return Parser().parse(value.decode("utf8"), context)
    elif isinstance(value, int):
        return Parser().parse(str(value), context)
    elif value is None:
        return Wikicode(SmartList())
    try:
        nodelist = SmartList()
        for item in value:
            nodelist += parse_anything(item, context).nodes
    except TypeError:
        error = "Needs string, Node, Wikicode, int, None, or iterable of these, but got {0}: {1}"
        raise ValueError(error.format(type(value).__name__, value))
    return Wikicode(nodelist)