mwparserfromhell/tests/test_wikicode.py

# Copyright (C) 2012-2025 Ben Kurtovic <ben.kurtovic@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

"""
Tests for the Wikicode class, which manages a list of nodes.
"""

from __future__ import annotations

import pickle
import re
from functools import partial
from types import GeneratorType
from typing import cast

import pytest

from mwparserfromhell import parse
from mwparserfromhell.nodes import Argument, Heading, Template, Text
from mwparserfromhell.smart_list import SmartList
from mwparserfromhell.wikicode import Wikicode

from .conftest import wrap, wraptext


def test_str():
    """test Wikicode.__str__()"""
    code1 = parse("foobar")
    code2 = parse("Have a {{template}} and a [[page|link]]")
    assert "foobar" == str(code1)
    assert "Have a {{template}} and a [[page|link]]" == str(code2)


def test_nodes():
    """test getter/setter for the nodes attribute"""
    code = parse("Have a {{template}}")
    assert ["Have a ", "{{template}}"] == code.nodes
    L1 = SmartList([Text("foobar"), Template(wraptext("abc"))])
    L2 = [Text("barfoo"), Template(wraptext("cba"))]
    L3 = "abc{{def}}"
    code.nodes = L1
    assert L1 is code.nodes
    code.nodes = L2
    assert L2 is code.nodes
    code.nodes = L3
    assert ["abc", "{{def}}"] == code.nodes
    with pytest.raises(ValueError):
        code.__setattr__("nodes", object)


@pytest.mark.parametrize("protocol", range(pickle.HIGHEST_PROTOCOL + 1))
def test_pickling(protocol: int):
    """test Wikicode objects can be pickled"""
    code = parse("Have a {{template}} and a [[page|link]]")
    enc = pickle.dumps(code, protocol=protocol)
    assert pickle.loads(enc) == code


def test_get():
    """test Wikicode.get()"""
    code = parse("Have a {{template}} and a [[page|link]]")
    assert code.nodes[0] is code.get(0)
    assert code.nodes[2] is code.get(2)
    with pytest.raises(IndexError):
        code.get(4)


def test_set():
    """test Wikicode.set()"""
    code = parse("Have a {{template}} and a [[page|link]]")
    code.set(1, "{{{argument}}}")
    assert "Have a {{{argument}}} and a [[page|link]]" == code
    assert isinstance(code.get(1), Argument)
    code.set(2, None)
    assert "Have a {{{argument}}}[[page|link]]" == code
    code.set(-3, "This is an ")
    assert "This is an {{{argument}}}[[page|link]]" == code
    with pytest.raises(ValueError):
        code.set(1, "foo {{bar}}")
    with pytest.raises(IndexError):
        code.set(3, "{{baz}}")
    with pytest.raises(IndexError):
        code.set(-4, "{{baz}}")


def test_contains():
    """test Wikicode.contains()"""
    code = parse("Here is {{aaa|{{bbb|xyz{{ccc}}}}}} and a [[page|link]]")
    tmpl1, tmpl2, tmpl3 = code.filter_templates()
    tmpl4 = parse("{{ccc}}").filter_templates()[0]
    assert code.contains(tmpl1) is True
    assert code.contains(tmpl3) is True
    assert code.contains(tmpl4) is False
    assert code.contains(str(tmpl4)) is True
    assert code.contains(tmpl2.params[0].value) is True


def test_index():
    """test Wikicode.index()"""
    code = parse("Have a {{template}} and a [[page|link]]")
    assert 0 == code.index("Have a ")
    assert 3 == code.index("[[page|link]]")
    assert 1 == code.index(code.get(1))
    with pytest.raises(ValueError):
        code.index("foo")

    code = parse("{{foo}}{{bar|{{baz}}}}")
    assert 1 == code.index("{{bar|{{baz}}}}")
    assert 1 == code.index("{{baz}}", recursive=True)
    assert 1 == code.index(cast(Template, code.get(1)).get(1).value, recursive=True)
    with pytest.raises(ValueError):
        code.index("{{baz}}", recursive=False)
    with pytest.raises(ValueError):
        code.index(cast(Template, code.get(1)).get(1).value, recursive=False)


def test_get_ancestors_parent():
    """test Wikicode.get_ancestors() and Wikicode.get_parent()"""
    code = parse("{{a|{{b|{{d|{{e}}{{f}}}}{{g}}}}}}{{c}}")
    tmpl = code.filter_templates(matches=lambda n: n.name == "f")[0]
    parent1 = code.filter_templates(matches=lambda n: n.name == "d")[0]
    parent2 = code.filter_templates(matches=lambda n: n.name == "b")[0]
    parent3 = code.filter_templates(matches=lambda n: n.name == "a")[0]
    fake = parse("{{f}}").get(0)

    assert [parent3, parent2, parent1] == code.get_ancestors(tmpl)
    assert parent1 is code.get_parent(tmpl)
    assert [] == code.get_ancestors(parent3)
    assert None is code.get_parent(parent3)
    with pytest.raises(ValueError):
        code.get_ancestors(fake)
    with pytest.raises(ValueError):
        code.get_parent(fake)


def test_insert():
    """test Wikicode.insert()"""
    code = parse("Have a {{template}} and a [[page|link]]")
    code.insert(1, "{{{argument}}}")
    assert "Have a {{{argument}}}{{template}} and a [[page|link]]" == code
    assert isinstance(code.get(1), Argument)
    code.insert(2, None)
    assert "Have a {{{argument}}}{{template}} and a [[page|link]]" == code
    code.insert(-3, Text("foo"))
    assert "Have a {{{argument}}}foo{{template}} and a [[page|link]]" == code

    code2 = parse("{{foo}}{{bar}}{{baz}}")
    code2.insert(1, "abc{{def}}ghi[[jk]]")
    assert "{{foo}}abc{{def}}ghi[[jk]]{{bar}}{{baz}}" == code2
    assert [
        "{{foo}}",
        "abc",
        "{{def}}",
        "ghi",
        "[[jk]]",
        "{{bar}}",
        "{{baz}}",
    ] == code2.nodes

    code3 = parse("{{foo}}bar")
    code3.insert(1000, "[[baz]]")
    code3.insert(-1000, "derp")
    assert "derp{{foo}}bar[[baz]]" == code3


def _test_search(meth, expected):
    """Base test for insert_before(), insert_after(), and replace()."""
    code = parse("{{a}}{{b}}{{c}}{{d}}{{e}}")
    func = partial(meth, code)
    func("{{b}}", "x", recursive=True)
    func("{{d}}", "[[y]]", recursive=False)
    func(code.get(2), "z")
    assert expected[0] == code
    with pytest.raises(ValueError):
        func("{{r}}", "n", recursive=True)
    with pytest.raises(ValueError):
        func("{{r}}", "n", recursive=False)
    fake = parse("{{a}}").get(0)
    with pytest.raises(ValueError):
        func(fake, "n", recursive=True)
    with pytest.raises(ValueError):
        func(fake, "n", recursive=False)

    code2 = parse("{{a}}{{a}}{{a}}{{b}}{{b}}{{b}}")
    func = partial(meth, code2)
    func(code2.get(1), "c", recursive=False)
    func("{{a}}", "d", recursive=False)
    func(code2.get(-1), "e", recursive=True)
    func("{{b}}", "f", recursive=True)
    assert expected[1] == code2

    code3 = parse("{{a|{{b}}|{{c|d={{f}}}}}}")
    func = partial(meth, code3)
    obj = cast(Template, code3.get(0)).params[0].value.get(0)
    with pytest.raises(ValueError):
        func(obj, "x", recursive=False)
    func(obj, "x", recursive=True)
    with pytest.raises(ValueError):
        func("{{f}}", "y", recursive=False)
    func("{{f}}", "y", recursive=True)
    assert expected[2] == code3

    code4 = parse("{{a}}{{b}}{{c}}{{d}}{{e}}{{f}}{{g}}{{h}}{{i}}{{j}}")
    func = partial(meth, code4)
    fake = parse("{{b}}{{c}}")
    with pytest.raises(ValueError):
        func(fake, "q", recursive=False)
    with pytest.raises(ValueError):
        func(fake, "q", recursive=True)
    func("{{b}}{{c}}", "w", recursive=False)
    func("{{d}}{{e}}", "x", recursive=True)
    func(Wikicode(code4.nodes[-2:]), "y", recursive=False)
    func(Wikicode(code4.nodes[-2:]), "z", recursive=True)
    assert expected[3] == code4
    with pytest.raises(ValueError):
        func("{{c}}{{d}}", "q", recursive=False)
    with pytest.raises(ValueError):
        func("{{c}}{{d}}", "q", recursive=True)

    code5 = parse("{{a|{{b}}{{c}}|{{f|{{g}}={{h}}{{i}}}}}}")
    func = partial(meth, code5)
    with pytest.raises(ValueError):
        func("{{b}}{{c}}", "x", recursive=False)
    func("{{b}}{{c}}", "x", recursive=True)
    obj = (
        cast(Template, cast(Template, code5.get(0)).params[1].value.get(0))
        .params[0]
        .value
    )
    with pytest.raises(ValueError):
        func(obj, "y", recursive=False)
    func(obj, "y", recursive=True)
    assert expected[4] == code5

    code6 = parse("here is {{some text and a {{template}}}}")
    func = partial(meth, code6)
    with pytest.raises(ValueError):
        func("text and", "ab", recursive=False)
    func("text and", "ab", recursive=True)
    with pytest.raises(ValueError):
        func("is {{some", "cd", recursive=False)
    func("is {{some", "cd", recursive=True)
    assert expected[5] == code6

    code7 = parse("{{foo}}{{bar}}{{baz}}{{foo}}{{baz}}")
    func = partial(meth, code7)
    obj = wrap([code7.get(0), code7.get(2)])
    with pytest.raises(ValueError):
        func(obj, "{{lol}}")
    func("{{foo}}{{baz}}", "{{lol}}")
    assert expected[6] == code7

    code8 = parse("== header ==")
    func = partial(meth, code8)
    sec1, sec2 = code8.get_sections(include_headings=False)
    func(sec1, "lead\n")
    func(sec2, "\nbody")
    assert expected[7] == code8

    code9 = parse("{{foo}}")
    meth(code9.get_sections()[0], code9.get_sections()[0], "{{bar}}")
    meth(code9.get_sections()[0], code9, "{{baz}}")
    meth(code9, code9, "{{qux}}")
    meth(code9, code9.get_sections()[0], "{{quz}}")
    assert expected[8] == code9


def test_insert_before():
    """test Wikicode.insert_before()"""

    def meth(code, *args, **kw):
        return code.insert_before(*args, **kw)

    expected = [
        "{{a}}xz{{b}}{{c}}[[y]]{{d}}{{e}}",
        "d{{a}}cd{{a}}d{{a}}f{{b}}f{{b}}ef{{b}}",
        "{{a|x{{b}}|{{c|d=y{{f}}}}}}",
        "{{a}}w{{b}}{{c}}x{{d}}{{e}}{{f}}{{g}}{{h}}yz{{i}}{{j}}",
        "{{a|x{{b}}{{c}}|{{f|{{g}}=y{{h}}{{i}}}}}}",
        "here cdis {{some abtext and a {{template}}}}",
        "{{foo}}{{bar}}{{baz}}{{lol}}{{foo}}{{baz}}",
        "lead\n== header ==\nbody",
        "{{quz}}{{qux}}{{baz}}{{bar}}{{foo}}",
    ]
    _test_search(meth, expected)


def test_insert_after():
    """test Wikicode.insert_after()"""

    def meth(code, *args, **kw):
        return code.insert_after(*args, **kw)

    expected = [
        "{{a}}{{b}}xz{{c}}{{d}}[[y]]{{e}}",
        "{{a}}d{{a}}dc{{a}}d{{b}}f{{b}}f{{b}}fe",
        "{{a|{{b}}x|{{c|d={{f}}y}}}}",
        "{{a}}{{b}}{{c}}w{{d}}{{e}}x{{f}}{{g}}{{h}}{{i}}{{j}}yz",
        "{{a|{{b}}{{c}}x|{{f|{{g}}={{h}}{{i}}y}}}}",
        "here is {{somecd text andab a {{template}}}}",
        "{{foo}}{{bar}}{{baz}}{{foo}}{{baz}}{{lol}}",
        "lead\n== header ==\nbody",
        "{{foo}}{{bar}}{{baz}}{{qux}}{{quz}}",
    ]
    _test_search(meth, expected)


def test_replace():
    """test Wikicode.replace()"""

    def meth(code, *args, **kw):
        return code.replace(*args, **kw)

    expected = [
        "{{a}}xz[[y]]{{e}}",
        "dcdffe",
        "{{a|x|{{c|d=y}}}}",
        "{{a}}wx{{f}}{{g}}z",
        "{{a|x|{{f|{{g}}=y}}}}",
        "here cd ab a {{template}}}}",
        "{{foo}}{{bar}}{{baz}}{{lol}}",
        "lead\n== header ==\nbody",
        "{{quz}}",
    ]
    _test_search(meth, expected)


def test_append():
    """test Wikicode.append()"""
    code = parse("Have a {{template}}")
    code.append("{{{argument}}}")
    assert "Have a {{template}}{{{argument}}}" == code
    assert isinstance(code.get(2), Argument)
    code.append(None)
    assert "Have a {{template}}{{{argument}}}" == code
    code.append(Text(" foo"))
    assert "Have a {{template}}{{{argument}}} foo" == code
    with pytest.raises(ValueError):
        code.append(slice(0, 1))


def test_remove():
    """test Wikicode.remove()"""

    def meth(code, obj, value, **kw):
        return code.remove(obj, **kw)

    expected = [
        "{{a}}{{c}}",
        "",
        "{{a||{{c|d=}}}}",
        "{{a}}{{f}}",
        "{{a||{{f|{{g}}=}}}}",
        "here   a {{template}}}}",
        "{{foo}}{{bar}}{{baz}}",
        "== header ==",
        "",
    ]
    _test_search(meth, expected)


def test_matches():
    """test Wikicode.matches()"""
    code1 = parse("Cleanup")
    code2 = parse("\nstub<!-- TODO: make more specific -->")
    code3 = parse("Hello world!")
    code4 = parse("World,_hello?")
    code5 = parse("")
    assert code1.matches("Cleanup") is True
    assert code1.matches("cleanup") is True
    assert code1.matches("  cleanup\n") is True
    assert code1.matches("CLEANup") is False
    assert code1.matches("Blah") is False
    assert code2.matches("stub") is True
    assert code2.matches("Stub<!-- no, it's fine! -->") is True
    assert code2.matches("StuB") is False
    assert code1.matches(("cleanup", "stub")) is True
    assert code2.matches(("cleanup", "stub")) is True
    assert code2.matches(("StuB", "sTUb", "foobar")) is False
    assert code2.matches(["StuB", "sTUb", "foobar"]) is False
    assert code2.matches(("StuB", "sTUb", "foo", "bar", "Stub")) is True
    assert code2.matches(["StuB", "sTUb", "foo", "bar", "Stub"]) is True
    assert code3.matches("hello world!") is True
    assert code3.matches("hello_world!") is True
    assert code3.matches("hello__world!") is False
    assert code4.matches("World,_hello?") is True
    assert code4.matches("World, hello?") is True
    assert code4.matches("World,  hello?") is False
    assert code5.matches("") is True
    assert code5.matches("<!-- nothing -->") is True
    assert code5.matches(("a", "b", "")) is True


def test_filter_family():
    """test the Wikicode.i?filter() family of functions"""

    def genlist(gen):
        assert isinstance(gen, GeneratorType)
        return list(gen)

    def ifilter(code):
        return lambda *a, **k: genlist(code.ifilter(*a, **k))

    code = parse("a{{b}}c[[d]]{{{e}}}{{f}}[[g]]")
    for func in (code.filter, ifilter(code)):
        assert [
            "a",
            "{{b}}",
            "b",
            "c",
            "[[d]]",
            "d",
            "{{{e}}}",
            "e",
            "{{f}}",
            "f",
            "[[g]]",
            "g",
        ] == func()
        assert ["{{{e}}}"] == func(forcetype=Argument)
        assert code.get(4) is func(forcetype=Argument)[0]
        assert list("abcdefg") == func(forcetype=Text)
        assert [] == func(forcetype=Heading)
        with pytest.raises(TypeError):
            func(forcetype=True)  # type: ignore

    funcs = [
        lambda name, **kw: getattr(code, "filter_" + name)(**kw),
        lambda name, **kw: genlist(getattr(code, "ifilter_" + name)(**kw)),
    ]
    for get_filter in funcs:
        assert ["{{{e}}}"] == get_filter("arguments")
        assert code.get(4) is get_filter("arguments")[0]
        assert [] == get_filter("comments")
        assert [] == get_filter("external_links")
        assert [] == get_filter("headings")
        assert [] == get_filter("html_entities")
        assert [] == get_filter("tags")
        assert ["{{b}}", "{{f}}"] == get_filter("templates")
        assert list("abcdefg") == get_filter("text")
        assert ["[[d]]", "[[g]]"] == get_filter("wikilinks")

    code2 = parse("{{a|{{b}}|{{c|d={{f}}{{h}}}}}}")
    for func in (code2.filter, ifilter(code2)):
        assert ["{{a|{{b}}|{{c|d={{f}}{{h}}}}}}"] == func(
            recursive=False, forcetype=Template
        )
        assert [
            "{{a|{{b}}|{{c|d={{f}}{{h}}}}}}",
            "{{b}}",
            "{{c|d={{f}}{{h}}}}",
            "{{f}}",
            "{{h}}",
        ] == func(recursive=True, forcetype=Template)

    code3 = parse("{{foobar}}{{FOO}}{{baz}}{{bz}}{{barfoo}}")
    for func in (code3.filter, ifilter(code3)):
        assert ["{{foobar}}", "{{barfoo}}"] == func(
            False, matches=lambda node: "foo" in node
        )
        assert ["{{foobar}}", "{{FOO}}", "{{barfoo}}"] == func(False, matches=r"foo")
        assert ["{{foobar}}", "{{FOO}}"] == func(matches=r"^{{foo.*?}}")
        assert ["{{foobar}}"] == func(matches=r"^{{foo.*?}}", flags=re.UNICODE)
        assert ["{{baz}}", "{{bz}}"] == func(matches=r"^{{b.*?z")
        assert ["{{baz}}"] == func(matches=r"^{{b.+?z}}")

    exp_rec = [
        "{{a|{{b}}|{{c|d={{f}}{{h}}}}}}",
        "{{b}}",
        "{{c|d={{f}}{{h}}}}",
        "{{f}}",
        "{{h}}",
    ]
    exp_unrec = ["{{a|{{b}}|{{c|d={{f}}{{h}}}}}}"]
    assert exp_rec == code2.filter_templates()
    assert exp_unrec == code2.filter_templates(recursive=False)
    assert exp_rec == code2.filter_templates(recursive=True)
    assert exp_rec == code2.filter_templates(True)
    assert exp_unrec == code2.filter_templates(False)

    assert ["{{foobar}}"] == code3.filter_templates(
        matches=lambda node: node.name.matches("Foobar")
    )
    assert ["{{baz}}", "{{bz}}"] == code3.filter_templates(matches=r"^{{b.*?z")
    assert [] == code3.filter_tags(matches=r"^{{b.*?z")
    assert [] == code3.filter_tags(matches=r"^{{b.*?z", flags=0)
    with pytest.raises(TypeError):
        code.filter_templates(a=42)  # type: ignore
    with pytest.raises(TypeError):
        code.filter_templates(forcetype=Template)  # type: ignore
    with pytest.raises(TypeError):
        code.filter_templates(1, 0, 0, Template)  # type: ignore

    code4 = parse("{{foo}}<b>{{foo|{{bar}}}}</b>")
    actual1 = code4.filter_templates(recursive=code4.RECURSE_OTHERS)
    actual2 = code4.filter_templates(code4.RECURSE_OTHERS)
    assert ["{{foo}}", "{{foo|{{bar}}}}"] == actual1
    assert ["{{foo}}", "{{foo|{{bar}}}}"] == actual2


def test_get_sections():
    """test Wikicode.get_sections()"""
    page1 = parse("")
    page2 = parse("==Heading==")
    page3 = parse("===Heading===\nFoo bar baz\n====Gnidaeh====\n")

    p4_lead = "This is a lead.\n"
    p4_IA = "=== Section I.A ===\nSection I.A [[body]].\n"
    p4_IB1 = "==== Section I.B.1 ====\nSection I.B.1 body.\n\n&bull;Some content.\n\n"
    p4_IB = "=== Section I.B ===\n" + p4_IB1
    p4_I = "== Section I ==\nSection I body. {{and a|template}}\n" + p4_IA + p4_IB
    p4_II = "== Section II ==\nSection II body.\n\n"
    p4_IIIA1a = "===== Section III.A.1.a =====\nMore text.\n"
    p4_IIIA2ai1 = "======= Section III.A.2.a.i.1 =======\nAn invalid section!"
    p4_IIIA2 = "==== Section III.A.2 ====\nEven more text.\n" + p4_IIIA2ai1
    p4_IIIA = "=== Section III.A ===\nText.\n" + p4_IIIA1a + p4_IIIA2
    p4_III = "== Section III ==\n" + p4_IIIA
    page4 = parse(p4_lead + p4_I + p4_II + p4_III)

    assert [""] == page1.get_sections()
    assert ["", "==Heading=="] == page2.get_sections()
    assert [
        "",
        "===Heading===\nFoo bar baz\n====Gnidaeh====\n",
        "====Gnidaeh====\n",
    ] == page3.get_sections()
    assert [
        p4_lead,
        p4_I,
        p4_IA,
        p4_IB,
        p4_IB1,
        p4_II,
        p4_III,
        p4_IIIA,
        p4_IIIA1a,
        p4_IIIA2,
        p4_IIIA2ai1,
    ] == page4.get_sections()

    assert ["====Gnidaeh====\n"] == page3.get_sections(levels=[4])
    assert ["===Heading===\nFoo bar baz\n====Gnidaeh====\n"] == page3.get_sections(
        levels=(2, 3)
    )
    assert ["===Heading===\nFoo bar baz\n"] == page3.get_sections(
        levels=(2, 3), flat=True
    )
    assert [] == page3.get_sections(levels=[0])
    assert ["", "====Gnidaeh====\n"] == page3.get_sections(
        levels=[4], include_lead=True
    )
    assert [
        "===Heading===\nFoo bar baz\n====Gnidaeh====\n",
        "====Gnidaeh====\n",
    ] == page3.get_sections(include_lead=False)
    assert ["===Heading===\nFoo bar baz\n", "====Gnidaeh====\n"] == page3.get_sections(
        flat=True, include_lead=False
    )

    assert [p4_IB1, p4_IIIA2] == page4.get_sections(levels=[4])
    assert [p4_IA, p4_IB, p4_IIIA] == page4.get_sections(levels=[3])
    assert [
        p4_IA,
        "=== Section I.B ===\n",
        "=== Section III.A ===\nText.\n",
    ] == page4.get_sections(levels=[3], flat=True)
    assert ["", ""] == page2.get_sections(include_headings=False)
    assert [
        "\nSection I.B.1 body.\n\n&bull;Some content.\n\n",
        "\nEven more text.\n" + p4_IIIA2ai1,
    ] == page4.get_sections(levels=[4], include_headings=False)

    assert [] == page4.get_sections(matches=r"body")
    assert [p4_I, p4_IA, p4_IB, p4_IB1] == page4.get_sections(
        matches=r"Section\sI[.\s].*?"
    )
    assert [p4_IA, p4_IIIA, p4_IIIA1a, p4_IIIA2, p4_IIIA2ai1] == page4.get_sections(
        matches=r".*?a.*?"
    )
    assert [p4_IIIA1a, p4_IIIA2ai1] == page4.get_sections(
        matches=r".*?a.*?", flags=re.U
    )
    assert ["\nMore text.\n", "\nAn invalid section!"] == page4.get_sections(
        matches=r".*?a.*?", flags=re.U, include_headings=False
    )

    sections = page2.get_sections(include_headings=False)
    sections[0].append("Lead!\n")
    sections[1].append("\nFirst section!")
    assert "Lead!\n==Heading==\nFirst section!" == page2

    page5 = parse("X\n== Foo ==\nBar\n== Baz ==\nBuzz")
    section = page5.get_sections(matches="Foo")[0]
    section.replace("\nBar\n", "\nBarf ")
    section.append("{{Haha}}\n")
    assert "== Foo ==\nBarf {{Haha}}\n" == section
    assert "X\n== Foo ==\nBarf {{Haha}}\n== Baz ==\nBuzz" == page5


def test_strip_code():
    """test Wikicode.strip_code()"""
    # Since individual nodes have test cases for their __strip__ methods,
    # we're only going to do an integration test:
    code = parse("Foo [[bar]]\n\n{{baz|hello}}\n\n[[a|b]] &Sigma;")
    assert "Foo bar\n\nb Σ" == code.strip_code(normalize=True, collapse=True)
    assert "Foo bar\n\n\n\nb Σ" == code.strip_code(normalize=True, collapse=False)
    assert "Foo bar\n\nb &Sigma;" == code.strip_code(normalize=False, collapse=True)
    assert "Foo bar\n\n\n\nb &Sigma;" == code.strip_code(
        normalize=False, collapse=False
    )
    assert "Foo bar\n\nhello\n\nb Σ" == code.strip_code(
        normalize=True, collapse=True, keep_template_params=True
    )


def test_get_tree():
    """test Wikicode.get_tree()"""
    # Since individual nodes have test cases for their __showtree___
    # methods, and the docstring covers all possibilities for the output of
    # __showtree__, we'll test it only:
    code = parse("Lorem ipsum {{foo|bar|{{baz}}|spam=eggs}}")
    expected = (
        "Lorem ipsum \n{{\n\t  foo\n\t| 1\n\t= bar\n\t| 2\n\t= "
        + "{{\n\t\t\tbaz\n\t  }}\n\t| spam\n\t= eggs\n}}"
    )
    assert expected.expandtabs(4) == code.get_tree()