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"""
This file runs imager tests by compiling TeX files and comparing
with reference output images.
The "benchmarks" folder containing the expected outputs.
Each time such a test fails, the output is placed into a "new" folder.
This allows both easy comparison and replacement of the benchmark in
case the change is desired.
"""
import os, shutil, difflib
from pathlib import Path
import pytest
from plasTeX.Renderers import Renderer
from plasTeX.TeX import TeX
from helpers.utils import cmp_img
@pytest.mark.parametrize('imager_tuple',
[('dvipng', '.png', None),
('dvisvgm', '.svg', None),
('gsdvipng', '.png', None),
('gspdfpng', '.png', None),
('pdf2svg', '.svg', None),
('pdf2svg', '.svg', 'xelatex'),
('pdf2svg', '.svg', 'lualatex'),
('pdftoppm', '.png', None)],
ids=lambda p: p[0] + "-" + str(p[2]))
def test_imager(imager_tuple, tmpdir):
imager, ext, compiler = imager_tuple
if ext == ".svg":
kind = "vector-imager"
else:
kind = "imager"
tmpdir = Path(str(tmpdir)) # for old pythons
tex = TeX()
tex.ownerDocument.config['images'][kind] = imager
if compiler is not None:
tex.ownerDocument.config['images'][kind.replace("imager", "compiler")] = compiler
tex.input(r'''
\documentclass{article}
\AtBeginDocument{You should not be seeing this in the imager output. This
is injected into the document with \textbackslash AtBeginDocument. The actual
image is on the second page and the imager should get the images from
there.}
\begin{document}
$a + b = x$
\end{document}
''')
renderer = Renderer()
if kind == "imager":
renderer['math'] = lambda node: node.image.url
else:
renderer['math'] = lambda node: node.vectorImage.url
directory = os.getcwd()
os.chdir(str(tmpdir))
renderer.render(tex.parse())
os.chdir(directory)
outfile = tmpdir/'images'/('img-0001' + ext)
root = Path(__file__).parent
benchfile = root/'benchmarks'/"{}-{}{}".format(imager, compiler, ext)
if not benchfile.exists():
(root/'new').mkdir(parents=True, exist_ok=True)
shutil.copyfile(str(outfile), str(root/'new'/benchfile.name))
raise OSError('No benchmark file: %s' % benchfile)
diff = cmp_img(str(benchfile.absolute()), str(outfile.absolute()))
if (ext == '.svg' and diff > 0.008) or diff > 0.01:
(root/'new').mkdir(parents=True, exist_ok=True)
shutil.copyfile(str(outfile), str(root/'new'/benchfile.name))
if ext == '.svg':
bench = benchfile.read_text().split('\n')
output = outfile.read_text()
print('SVG differences:\n','\n'.join(difflib.unified_diff(
bench, output.split('\n'), fromfile='benchmark', tofile='output')).strip())
print('Full svg:\n\n', output)
assert False, 'Differences were found:\n' + str(diff)
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