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"""Test CSS font-related properties."""
from math import isclose
import pytest
from weasyprint import CSS
from weasyprint.css import get_all_computed_styles
from weasyprint.text.line_break import strut
from ..testing_utils import FakeHTML, assert_no_logs, render_pages
@assert_no_logs
@pytest.mark.parametrize(('parent_css', 'parent_size', 'child_css', 'child_size'), [
('10px', 10, '10px', 10),
('x-small', 12, 'xx-large', 32),
('x-large', 24, '2em', 48),
('1em', 16, '1em', 16),
('1em', 16, 'larger', 6 / 5 * 16),
('medium', 16, 'larger', 6 / 5 * 16),
('x-large', 24, 'larger', 32),
('xx-large', 32, 'larger', 1.2 * 32),
('1px', 1, 'larger', 3 / 5 * 16),
('28px', 28, 'larger', 32),
('100px', 100, 'larger', 120),
('xx-small', 3 / 5 * 16, 'larger', 12),
('1em', 16, 'smaller', 8 / 9 * 16),
('medium', 16, 'smaller', 8 / 9 * 16),
('x-large', 24, 'smaller', 6 / 5 * 16),
('xx-large', 32, 'smaller', 24),
('xx-small', 3 / 5 * 16, 'smaller', 0.8 * 3 / 5 * 16),
('1px', 1, 'smaller', 0.8),
('28px', 28, 'smaller', 24),
('100px', 100, 'smaller', 32),
])
def test_font_size(parent_css, parent_size, child_css, child_size):
document = FakeHTML(string='<p>a<span>b')
style_for = get_all_computed_styles(document, user_stylesheets=[CSS(
string='p{font-size:%s}span{font-size:%s}' % (parent_css, child_css))])
_head, body = document.etree_element
p, = body
span, = p
assert isclose(style_for(p)['font_size'], parent_size)
assert isclose(style_for(span)['font_size'], child_size)
@assert_no_logs
def test_line_height_inheritance():
page, = render_pages('''
<style>
html { font-size: 10px; line-height: 140% }
section { font-size: 10px; line-height: 1.4 }
div, p { font-size: 20px; vertical-align: 50% }
</style>
<body><div><section><p></p></section></div></body>
''')
html, = page.children
body, = html.children
div, = body.children
section, = div.children
paragraph, = section.children
assert html.style['font_size'] == 10
assert div.style['font_size'] == 20
# 140% of 10px = 14px is inherited from html
assert strut(div.style)[0] == 14
assert div.style['vertical_align'] == 7 # 50 % of 14px
assert paragraph.style['font_size'] == 20
# 1.4 is inherited from p, 1.4 * 20px on em = 28px
assert strut(paragraph.style)[0] == 28
assert paragraph.style['vertical_align'] == 14 # 50% of 28px
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