#     Copyright 2024, Kay Hayen, mailto:kay.hayen@gmail.com find license text at end of file


""" XML node tree handling

Means to create XML elements from Nuitka tree nodes and to convert the
XML tree to ASCII or output it.
"""

from nuitka.__past__ import StringIO


def _indent(elem, level=0, more_sibs=False):
    i = "\n"
    if level:
        i += (level - 1) * "  "
    num_kids = len(elem)
    if num_kids:
        if not elem.text or not elem.text.strip():
            elem.text = i + "  "
            if level:
                elem.text += "  "
        count = 0
        for kid in elem:
            _indent(kid, level + 1, count < num_kids - 1)
            count += 1
        if not elem.tail or not elem.tail.strip():
            elem.tail = i
            if more_sibs:
                elem.tail += "  "
    else:
        if level and (not elem.tail or not elem.tail.strip()):
            elem.tail = i
            if more_sibs:
                elem.tail += "  "

    return elem


def _dedent(elem, level=0):
    if not elem.text or not elem.text.strip():
        elem.text = ""

    for child in elem:
        _dedent(child, level + 1)

    if not elem.tail or not elem.tail.strip():
        elem.tail = ""

    return elem


try:
    import xml.etree.ElementTree

    xml_module = xml.etree.ElementTree

    Element = xml.etree.ElementTree.Element

    def xml_tostring(tree, indent=True, encoding=None):
        if indent:
            _indent(tree)
        elif not indent:
            _dedent(tree)

        return xml_module.tostring(tree, encoding=encoding)

except ImportError:
    xml_module = None
    Element = None
    xml_tostring = None

# TODO: Use the writer to create the XML we output. That should be more
# scalable and/or faster.
# try:
#     from lxml import (
#         xmlfile as xml_writer,  # pylint: disable=I0021,import-error,unused-import
#     )
# except ImportError:
#     xml_writer = None


def toBytes(tree, indent=True, encoding=None):
    return xml_tostring(tree, indent=indent, encoding=encoding)


def toString(tree):
    result = toBytes(tree, encoding="utf8")

    if str is not bytes:
        result = result.decode("utf8")

    return result


def fromString(text):
    return fromFile(StringIO(text))


def fromFile(file_handle, use_lxml=False):
    if use_lxml:
        from lxml import etree  # pylint: disable=I0021,import-error

        return etree.parse(file_handle).getroot()
    else:
        return xml_module.parse(file_handle).getroot()


def appendTreeElement(parent, *args, **kwargs):
    element = Element(*args, **kwargs)

    parent.append(element)

    return element


def dumpTreeXMLToFile(tree, output_file):
    """Write an XML node tree to a file."""

    value = toBytes(tree).rstrip()
    output_file.write(value)


#     Part of "Nuitka", an optimizing Python compiler that is compatible and
#     integrates with CPython, but also works on its own.
#
#     Licensed under the Apache License, Version 2.0 (the "License");
#     you may not use this file except in compliance with the License.
#     You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#     Unless required by applicable law or agreed to in writing, software
#     distributed under the License is distributed on an "AS IS" BASIS,
#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#     See the License for the specific language governing permissions and
#     limitations under the License.
