#! /usr/bin/env python3

# $Id$
# Author: David Goodger <goodger@python.org>
# Copyright: This module has been placed in the public domain.

"""
Test module for misc.Transitions transform.
"""

from pathlib import Path
import sys
import unittest

if __name__ == '__main__':
    # prepend the "docutils root" to the Python library path
    # so we import the local `docutils` package.
    sys.path.insert(0, str(Path(__file__).resolve().parents[2]))

from docutils.frontend import get_default_settings
from docutils.parsers.rst import Parser
from docutils.transforms.misc import Transitions
from docutils.transforms.universal import TestMessages
from docutils.utils import new_document


class TransformTestCase(unittest.TestCase):
    def test_transforms(self):
        parser = Parser()
        settings = get_default_settings(Parser)
        settings.warning_stream = ''
        for name, (transforms, cases) in totest.items():
            for casenum, (case_input, case_expected) in enumerate(cases):
                with self.subTest(id=f'totest[{name!r}][{casenum}]'):
                    document = new_document('test data', settings.copy())
                    parser.parse(case_input, document)
                    # Don't do a ``populate_from_components()`` because that
                    # would enable the Transformer's default transforms.
                    document.transformer.add_transforms(transforms)
                    document.transformer.add_transform(TestMessages)
                    document.transformer.apply_transforms()
                    output = document.pformat()
                    self.assertEqual(output, case_expected)


totest = {}

totest['transitions'] = ((Transitions,), [
["""\
Section 1
=========

Subsection 1
------------

Some text.

----------

Section 2
=========

Some text.
""",
"""\
<document source="test data">
    <section ids="section-1" names="section\\ 1">
        <title>
            Section 1
        <section ids="subsection-1" names="subsection\\ 1">
            <title>
                Subsection 1
            <paragraph>
                Some text.
    <transition>
    <section ids="section-2" names="section\\ 2">
        <title>
            Section 2
        <paragraph>
            Some text.
"""],
["""\
A paragraph.

----------

Section 1
=========

Paragraph.
""",
"""\
<document source="test data">
    <paragraph>
        A paragraph.
    <transition>
    <section ids="section-1" names="section\\ 1">
        <title>
            Section 1
        <paragraph>
            Paragraph.
"""],
["""\
--------

A section or document may not begin with a transition.

The DTD specifies that two transitions may not
be adjacent:

--------

--------

--------

The DTD also specifies that a section or document
may not end with a transition.

--------
""",
"""\
<document source="test data">
    <system_message level="3" line="1" source="test data" type="ERROR">
        <paragraph>
            Document or section may not begin with a transition.
    <transition>
    <paragraph>
        A section or document may not begin with a transition.
    <paragraph>
        The DTD specifies that two transitions may not
        be adjacent:
    <transition>
    <system_message level="3" line="10" source="test data" type="ERROR">
        <paragraph>
            At least one body element must separate transitions; adjacent transitions are not allowed.
    <transition>
    <system_message level="3" line="12" source="test data" type="ERROR">
        <paragraph>
            At least one body element must separate transitions; adjacent transitions are not allowed.
    <transition>
    <paragraph>
        The DTD also specifies that a section or document
        may not end with a transition.
    <transition>
    <system_message level="3" line="17" source="test data" type="ERROR">
        <paragraph>
            Document may not end with a transition.
"""],
["""\
Sections with transitions at beginning and end.

Section 1
=========

----------

The next transition is legal:

----------

Section 2
=========

----------
""",
"""\
<document source="test data">
    <paragraph>
        Sections with transitions at beginning and end.
    <section ids="section-1" names="section\\ 1">
        <title>
            Section 1
        <system_message level="3" line="6" source="test data" type="ERROR">
            <paragraph>
                Document or section may not begin with a transition.
        <transition>
        <paragraph>
            The next transition is legal:
    <transition>
    <section ids="section-2" names="section\\ 2">
        <title>
            Section 2
        <system_message level="3" line="15" source="test data" type="ERROR">
            <paragraph>
                Document or section may not begin with a transition.
        <transition>
        <system_message level="3" line="15" source="test data" type="ERROR">
            <paragraph>
                Document may not end with a transition.
"""],
["""\
A paragraph and two transitions.

----------

----------
""",
"""\
<document source="test data">
    <paragraph>
        A paragraph and two transitions.
    <transition>
    <system_message level="3" line="5" source="test data" type="ERROR">
        <paragraph>
            At least one body element must separate transitions; adjacent transitions are not allowed.
    <transition>
    <system_message level="3" line="5" source="test data" type="ERROR">
        <paragraph>
            Document may not end with a transition.
"""],
["""\
A paragraph, two transitions, and a blank line.

----------

----------

""",
"""\
<document source="test data">
    <paragraph>
        A paragraph, two transitions, and a blank line.
    <transition>
    <system_message level="3" line="5" source="test data" type="ERROR">
        <paragraph>
            At least one body element must separate transitions; adjacent transitions are not allowed.
    <transition>
    <system_message level="3" line="5" source="test data" type="ERROR">
        <paragraph>
            Document may not end with a transition.
"""],
["""\
----------

Document beginning with a transition.
""",
"""\
<document source="test data">
    <system_message level="3" line="1" source="test data" type="ERROR">
        <paragraph>
            Document or section may not begin with a transition.
    <transition>
    <paragraph>
        Document beginning with a transition.
"""],
["""\
Section 1
=========

----------

----------

----------

Section 2
=========

Some text.
""",
"""\
<document source="test data">
    <section ids="section-1" names="section\\ 1">
        <title>
            Section 1
        <system_message level="3" line="4" source="test data" type="ERROR">
            <paragraph>
                Document or section may not begin with a transition.
        <transition>
        <system_message level="3" line="6" source="test data" type="ERROR">
            <paragraph>
                At least one body element must separate transitions; adjacent transitions are not allowed.
        <transition>
        <system_message level="3" line="8" source="test data" type="ERROR">
            <paragraph>
                At least one body element must separate transitions; adjacent transitions are not allowed.
    <transition>
    <section ids="section-2" names="section\\ 2">
        <title>
            Section 2
        <paragraph>
            Some text.
"""],
["""\
----------

----------

----------
""",
"""\
<document source="test data">
    <system_message level="3" line="1" source="test data" type="ERROR">
        <paragraph>
            Document or section may not begin with a transition.
    <transition>
    <system_message level="3" line="3" source="test data" type="ERROR">
        <paragraph>
            At least one body element must separate transitions; adjacent transitions are not allowed.
    <transition>
    <system_message level="3" line="5" source="test data" type="ERROR">
        <paragraph>
            At least one body element must separate transitions; adjacent transitions are not allowed.
    <transition>
    <system_message level="3" line="5" source="test data" type="ERROR">
        <paragraph>
            Document may not end with a transition.
"""],
["""\
A paragraph.

----------

""",
"""\
<document source="test data">
    <paragraph>
        A paragraph.
    <transition>
    <system_message level="3" line="3" source="test data" type="ERROR">
        <paragraph>
            Document may not end with a transition.
"""],
])


if __name__ == '__main__':
    unittest.main()