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1#!/usr/bin/env python3
2
3# Pre-generates the expected output subset files (via fonttools) for
4# specified subset test suite(s).
5
6import os
7import sys
8import shutil
9import io
10import re
11import tempfile
12
13from difflib import unified_diff
14from fontTools.ttLib import TTFont
15
16from subprocess import check_call
17from subset_test_suite import SubsetTestSuite
18
19
20def usage():
21	print("Usage: generate-expected-outputs.py hb-subset <test suite file> ...")
22
23
24def strip_check_sum (ttx_string):
25	return re.sub ('checkSumAdjustment value=["]0x([0-9a-fA-F])+["]',
26		       'checkSumAdjustment value="0x00000000"',
27		       ttx_string, count=1)
28
29
30def generate_expected_output(input_file, unicodes, profile_flags, instance_flags, output_directory, font_name, no_fonttools):
31	input_path = input_file
32	if not no_fonttools and instance_flags:
33		instance_path = os.path.join(tempfile.mkdtemp (), font_name)
34		args = ["fonttools", "varLib.instancer",
35			"--no-overlap-flag",
36			"--no-recalc-timestamp",
37			"--no-optimize",
38			"--output=%s" % instance_path,
39			input_file]
40		args.extend(instance_flags)
41		check_call(args)
42		input_path = instance_path
43
44	fonttools_path = os.path.join(tempfile.mkdtemp (), font_name)
45	args = ["fonttools", "subset", input_path]
46	if instance_flags:
47		args.extend(["--recalc-bounds"])
48	args.extend(["--drop-tables+=DSIG",
49		     "--drop-tables-=sbix",
50		     "--no-harfbuzz-repacker", # disable harfbuzz repacker so we aren't comparing to ourself.
51		     "--output-file=%s" % fonttools_path])
52	if unicodes != "":
53		args.extend(["--unicodes=%s" % unicodes,])
54
55	# --gid-map is unsupported in fonttools so don't send it. Tests using
56	# it are crafted to work without fonttools knowing about the flag.
57	args.extend([f for f in profile_flags if not f.startswith("--gid-map")])
58	if not no_fonttools:
59		check_call(args)
60
61		with io.StringIO () as fp:
62			with TTFont (fonttools_path) as font:
63				font.saveXML (fp)
64				fonttools_ttx = strip_check_sum (fp.getvalue ())
65
66	harfbuzz_path = os.path.join(tempfile.mkdtemp (), font_name)
67	args = [
68		hb_subset,
69		"--font-file=" + input_file,
70		"--output-file=" + harfbuzz_path,
71		"--drop-tables+=DSIG",
72		"--drop-tables-=sbix"]
73	if unicodes != "":
74		args.extend(["--unicodes=%s" % unicodes,])
75	args.extend(profile_flags)
76	if instance_flags:
77		args.extend(["--instance=%s" % ','.join(instance_flags)])
78	check_call(args)
79
80	with io.StringIO () as fp:
81		with TTFont (harfbuzz_path) as font:
82			font.saveXML (fp)
83		harfbuzz_ttx = strip_check_sum (fp.getvalue ())
84
85	if not no_fonttools and harfbuzz_ttx != fonttools_ttx:
86		for line in unified_diff (fonttools_ttx.splitlines (1), harfbuzz_ttx.splitlines (1), fonttools_path, harfbuzz_path):
87			sys.stdout.write (line)
88		sys.stdout.flush ()
89		raise Exception ('ttx for fonttools and harfbuzz does not match.')
90
91	output_path = os.path.join(output_directory, font_name)
92	shutil.copy(harfbuzz_path, output_path)
93
94
95args = sys.argv[1:]
96if not args:
97	usage()
98hb_subset, args = args[0], args[1:]
99if not args:
100	usage()
101
102for path in args:
103	with open(path, mode="r", encoding="utf-8") as f:
104		test_suite = SubsetTestSuite(path, f.read())
105		output_directory = test_suite.get_output_directory()
106
107		print("Generating output files for %s" % output_directory)
108		for test in test_suite.tests():
109			unicodes = test.unicodes()
110			font_name = test.get_font_name()
111			no_fonttools = ("no_fonttools" in test.options)
112			print("Creating subset %s/%s" % (output_directory, font_name))
113			generate_expected_output(test.font_path, unicodes, test.get_profile_flags(),
114						 test.get_instance_flags(), output_directory, font_name, no_fonttools=no_fonttools)
115