cpython/Lib/idlelib/idle_test/test_sidebar.py

"""Test sidebar, coverage 93%"""
import idlelib.sidebar
from itertools import chain
import unittest
import unittest.mock
from test.support import requires
import tkinter as tk

from idlelib.delegator import Delegator
from idlelib.percolator import Percolator


class Dummy_editwin:
    def __init__(self, text):
        self.text = text
        self.text_frame = self.text.master
        self.per = Percolator(text)
        self.undo = Delegator()
        self.per.insertfilter(self.undo)

    def setvar(self, name, value):
        pass

    def getlineno(self, index):
        return int(float(self.text.index(index)))


class LineNumbersTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        requires('gui')
        cls.root = tk.Tk()

        cls.text_frame = tk.Frame(cls.root)
        cls.text_frame.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
        cls.text_frame.rowconfigure(1, weight=1)
        cls.text_frame.columnconfigure(1, weight=1)

        cls.text = tk.Text(cls.text_frame, width=80, height=24, wrap=tk.NONE)
        cls.text.grid(row=1, column=1, sticky=tk.NSEW)

        cls.editwin = Dummy_editwin(cls.text)
        cls.editwin.vbar = tk.Scrollbar(cls.text_frame)

    @classmethod
    def tearDownClass(cls):
        cls.editwin.per.close()
        cls.root.update()
        cls.root.destroy()
        del cls.text, cls.text_frame, cls.editwin, cls.root

    def setUp(self):
        self.linenumber = idlelib.sidebar.LineNumbers(self.editwin)

        self.highlight_cfg = {"background": '#abcdef',
                              "foreground": '#123456'}
        orig_idleConf_GetHighlight = idlelib.sidebar.idleConf.GetHighlight
        def mock_idleconf_GetHighlight(theme, element):
            if element == 'linenumber':
                return self.highlight_cfg
            return orig_idleConf_GetHighlight(theme, element)
        GetHighlight_patcher = unittest.mock.patch.object(
            idlelib.sidebar.idleConf, 'GetHighlight', mock_idleconf_GetHighlight)
        GetHighlight_patcher.start()
        self.addCleanup(GetHighlight_patcher.stop)

        self.font_override = 'TkFixedFont'
        def mock_idleconf_GetFont(root, configType, section):
            return self.font_override
        GetFont_patcher = unittest.mock.patch.object(
            idlelib.sidebar.idleConf, 'GetFont', mock_idleconf_GetFont)
        GetFont_patcher.start()
        self.addCleanup(GetFont_patcher.stop)

    def tearDown(self):
        self.text.delete('1.0', 'end')

    def get_selection(self):
        return tuple(map(str, self.text.tag_ranges('sel')))

    def get_line_screen_position(self, line):
        bbox = self.linenumber.sidebar_text.bbox(f'{line}.end -1c')
        x = bbox[0] + 2
        y = bbox[1] + 2
        return x, y

    def assert_state_disabled(self):
        state = self.linenumber.sidebar_text.config()['state']
        self.assertEqual(state[-1], tk.DISABLED)

    def get_sidebar_text_contents(self):
        return self.linenumber.sidebar_text.get('1.0', tk.END)

    def assert_sidebar_n_lines(self, n_lines):
        expected = '\n'.join(chain(map(str, range(1, n_lines + 1)), ['']))
        self.assertEqual(self.get_sidebar_text_contents(), expected)

    def assert_text_equals(self, expected):
        return self.assertEqual(self.text.get('1.0', 'end'), expected)

    def test_init_empty(self):
        self.assert_sidebar_n_lines(1)

    def test_init_not_empty(self):
        self.text.insert('insert', 'foo bar\n'*3)
        self.assert_text_equals('foo bar\n'*3 + '\n')
        self.assert_sidebar_n_lines(4)

    def test_toggle_linenumbering(self):
        self.assertEqual(self.linenumber.is_shown, False)
        self.linenumber.show_sidebar()
        self.assertEqual(self.linenumber.is_shown, True)
        self.linenumber.hide_sidebar()
        self.assertEqual(self.linenumber.is_shown, False)
        self.linenumber.hide_sidebar()
        self.assertEqual(self.linenumber.is_shown, False)
        self.linenumber.show_sidebar()
        self.assertEqual(self.linenumber.is_shown, True)
        self.linenumber.show_sidebar()
        self.assertEqual(self.linenumber.is_shown, True)

    def test_insert(self):
        self.text.insert('insert', 'foobar')
        self.assert_text_equals('foobar\n')
        self.assert_sidebar_n_lines(1)
        self.assert_state_disabled()

        self.text.insert('insert', '\nfoo')
        self.assert_text_equals('foobar\nfoo\n')
        self.assert_sidebar_n_lines(2)
        self.assert_state_disabled()

        self.text.insert('insert', 'hello\n'*2)
        self.assert_text_equals('foobar\nfoohello\nhello\n\n')
        self.assert_sidebar_n_lines(4)
        self.assert_state_disabled()

        self.text.insert('insert', '\nworld')
        self.assert_text_equals('foobar\nfoohello\nhello\n\nworld\n')
        self.assert_sidebar_n_lines(5)
        self.assert_state_disabled()

    def test_delete(self):
        self.text.insert('insert', 'foobar')
        self.assert_text_equals('foobar\n')
        self.text.delete('1.1', '1.3')
        self.assert_text_equals('fbar\n')
        self.assert_sidebar_n_lines(1)
        self.assert_state_disabled()

        self.text.insert('insert', 'foo\n'*2)
        self.assert_text_equals('fbarfoo\nfoo\n\n')
        self.assert_sidebar_n_lines(3)
        self.assert_state_disabled()

        # Note: deleting up to "2.end" doesn't delete the final newline.
        self.text.delete('2.0', '2.end')
        self.assert_text_equals('fbarfoo\n\n\n')
        self.assert_sidebar_n_lines(3)
        self.assert_state_disabled()

        self.text.delete('1.3', 'end')
        self.assert_text_equals('fba\n')
        self.assert_sidebar_n_lines(1)
        self.assert_state_disabled()

        # Note: Text widgets always keep a single '\n' character at the end.
        self.text.delete('1.0', 'end')
        self.assert_text_equals('\n')
        self.assert_sidebar_n_lines(1)
        self.assert_state_disabled()

    def test_sidebar_text_width(self):
        """
        Test that linenumber text widget is always at the minimum
        width
        """
        def get_width():
            return self.linenumber.sidebar_text.config()['width'][-1]

        self.assert_sidebar_n_lines(1)
        self.assertEqual(get_width(), 1)

        self.text.insert('insert', 'foo')
        self.assert_sidebar_n_lines(1)
        self.assertEqual(get_width(), 1)

        self.text.insert('insert', 'foo\n'*8)
        self.assert_sidebar_n_lines(9)
        self.assertEqual(get_width(), 1)

        self.text.insert('insert', 'foo\n')
        self.assert_sidebar_n_lines(10)
        self.assertEqual(get_width(), 2)

        self.text.insert('insert', 'foo\n')
        self.assert_sidebar_n_lines(11)
        self.assertEqual(get_width(), 2)

        self.text.delete('insert -1l linestart', 'insert linestart')
        self.assert_sidebar_n_lines(10)
        self.assertEqual(get_width(), 2)

        self.text.delete('insert -1l linestart', 'insert linestart')
        self.assert_sidebar_n_lines(9)
        self.assertEqual(get_width(), 1)

        self.text.insert('insert', 'foo\n'*90)
        self.assert_sidebar_n_lines(99)
        self.assertEqual(get_width(), 2)

        self.text.insert('insert', 'foo\n')
        self.assert_sidebar_n_lines(100)
        self.assertEqual(get_width(), 3)

        self.text.insert('insert', 'foo\n')
        self.assert_sidebar_n_lines(101)
        self.assertEqual(get_width(), 3)

        self.text.delete('insert -1l linestart', 'insert linestart')
        self.assert_sidebar_n_lines(100)
        self.assertEqual(get_width(), 3)

        self.text.delete('insert -1l linestart', 'insert linestart')
        self.assert_sidebar_n_lines(99)
        self.assertEqual(get_width(), 2)

        self.text.delete('50.0 -1c', 'end -1c')
        self.assert_sidebar_n_lines(49)
        self.assertEqual(get_width(), 2)

        self.text.delete('5.0 -1c', 'end -1c')
        self.assert_sidebar_n_lines(4)
        self.assertEqual(get_width(), 1)

        # Note: Text widgets always keep a single '\n' character at the end.
        self.text.delete('1.0', 'end -1c')
        self.assert_sidebar_n_lines(1)
        self.assertEqual(get_width(), 1)

    def test_click_selection(self):
        self.linenumber.show_sidebar()
        self.text.insert('1.0', 'one\ntwo\nthree\nfour\n')
        self.root.update()

        # Click on the second line.
        x, y = self.get_line_screen_position(2)
        self.linenumber.sidebar_text.event_generate('<Button-1>', x=x, y=y)
        self.linenumber.sidebar_text.update()
        self.root.update()

        self.assertEqual(self.get_selection(), ('2.0', '3.0'))

    def simulate_drag(self, start_line, end_line):
        start_x, start_y = self.get_line_screen_position(start_line)
        end_x, end_y = self.get_line_screen_position(end_line)

        self.linenumber.sidebar_text.event_generate('<Button-1>',
                                                    x=start_x, y=start_y)
        self.root.update()

        def lerp(a, b, steps):
            """linearly interpolate from a to b (inclusive) in equal steps"""
            last_step = steps - 1
            for i in range(steps):
                yield ((last_step - i) / last_step) * a + (i / last_step) * b

        for x, y in zip(
                map(int, lerp(start_x, end_x, steps=11)),
                map(int, lerp(start_y, end_y, steps=11)),
        ):
            self.linenumber.sidebar_text.event_generate('<B1-Motion>', x=x, y=y)
            self.root.update()

        self.linenumber.sidebar_text.event_generate('<ButtonRelease-1>',
                                                    x=end_x, y=end_y)
        self.root.update()

    def test_drag_selection_down(self):
        self.linenumber.show_sidebar()
        self.text.insert('1.0', 'one\ntwo\nthree\nfour\nfive\n')
        self.root.update()

        # Drag from the second line to the fourth line.
        self.simulate_drag(2, 4)
        self.assertEqual(self.get_selection(), ('2.0', '5.0'))

    def test_drag_selection_up(self):
        self.linenumber.show_sidebar()
        self.text.insert('1.0', 'one\ntwo\nthree\nfour\nfive\n')
        self.root.update()

        # Drag from the fourth line to the second line.
        self.simulate_drag(4, 2)
        self.assertEqual(self.get_selection(), ('2.0', '5.0'))

    def test_scroll(self):
        self.linenumber.show_sidebar()
        self.text.insert('1.0', 'line\n' * 100)
        self.root.update()

        # Scroll down 10 lines.
        self.text.yview_scroll(10, 'unit')
        self.root.update()
        self.assertEqual(self.text.index('@0,0'), '11.0')
        self.assertEqual(self.linenumber.sidebar_text.index('@0,0'), '11.0')

        # Generate a mouse-wheel event and make sure it scrolled up or down.
        # The meaning of the "delta" is OS-dependant, so this just checks for
        # any change.
        self.linenumber.sidebar_text.event_generate('<MouseWheel>',
                                                    x=0, y=0,
                                                    delta=10)
        self.root.update()
        self.assertNotEqual(self.text.index('@0,0'), '11.0')
        self.assertNotEqual(self.linenumber.sidebar_text.index('@0,0'), '11.0')

    def test_font(self):
        ln = self.linenumber

        orig_font = ln.sidebar_text['font']
        test_font = 'TkTextFont'
        self.assertNotEqual(orig_font, test_font)

        # Ensure line numbers aren't shown.
        ln.hide_sidebar()

        self.font_override = test_font
        # Nothing breaks when line numbers aren't shown.
        ln.update_font()

        # Activate line numbers, previous font change is immediately effective.
        ln.show_sidebar()
        self.assertEqual(ln.sidebar_text['font'], test_font)

        # Call the font update with line numbers shown, change is picked up.
        self.font_override = orig_font
        ln.update_font()
        self.assertEqual(ln.sidebar_text['font'], orig_font)

    def test_highlight_colors(self):
        ln = self.linenumber

        orig_colors = dict(self.highlight_cfg)
        test_colors = {'background': '#222222', 'foreground': '#ffff00'}

        def assert_colors_are_equal(colors):
            self.assertEqual(ln.sidebar_text['background'], colors['background'])
            self.assertEqual(ln.sidebar_text['foreground'], colors['foreground'])

        # Ensure line numbers aren't shown.
        ln.hide_sidebar()

        self.highlight_cfg = test_colors
        # Nothing breaks with inactive code context.
        ln.update_colors()

        # Show line numbers, previous colors change is immediately effective.
        ln.show_sidebar()
        assert_colors_are_equal(test_colors)

        # Call colors update with no change to the configured colors.
        ln.update_colors()
        assert_colors_are_equal(test_colors)

        # Call the colors update with line numbers shown, change is picked up.
        self.highlight_cfg = orig_colors
        ln.update_colors()
        assert_colors_are_equal(orig_colors)


if __name__ == '__main__':
    unittest.main(verbosity=2)