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#! /usr/bin/env python3
"""usage: ttroundtrip [options] font1 ... fontN
Dump each TT/OT font as a TTX file, compile again to TTF or OTF
and dump again. Then do a diff on the two TTX files. Append problems
and diffs to a file called "report.txt" in the current directory.
This is only for testing FontTools/TTX, the resulting files are
deleted afterwards.
This tool supports some of ttx's command line options (-i, -t
and -x). Specifying -t or -x implies ttx -m <originalfile> on
the way back.
"""
import sys
import os
import tempfile
import getopt
import traceback
from fontTools import ttx
class Error(Exception):
pass
def usage():
print(__doc__)
sys.exit(2)
def roundTrip(ttFile1, options, report):
fn = os.path.basename(ttFile1)
xmlFile1 = tempfile.mkstemp(".%s.ttx1" % fn)
ttFile2 = tempfile.mkstemp(".%s" % fn)
xmlFile2 = tempfile.mkstemp(".%s.ttx2" % fn)
try:
ttx.ttDump(ttFile1, xmlFile1, options)
if options.onlyTables or options.skipTables:
options.mergeFile = ttFile1
ttx.ttCompile(xmlFile1, ttFile2, options)
options.mergeFile = None
ttx.ttDump(ttFile2, xmlFile2, options)
diffcmd = 'diff -U2 -I ".*modified value\|checkSumAdjustment.*" "%s" "%s"' % (
xmlFile1,
xmlFile2,
)
output = os.popen(diffcmd, "r", 1)
lines = []
while True:
line = output.readline()
if not line:
break
sys.stdout.write(line)
lines.append(line)
if lines:
report.write(
"=============================================================\n"
)
report.write(' "%s" differs after round tripping\n' % ttFile1)
report.write(
"-------------------------------------------------------------\n"
)
report.writelines(lines)
else:
print("(TTX files are the same)")
finally:
for tmpFile in (xmlFile1, ttFile2, xmlFile2):
if os.path.exists(tmpFile):
os.remove(tmpFile)
def main(args):
try:
rawOptions, files = getopt.getopt(args, "it:x:")
except getopt.GetoptError:
usage()
if not files:
usage()
with open("report.txt", "a+") as report:
options = ttx.Options(rawOptions, len(files))
for ttFile in files:
try:
roundTrip(ttFile, options, report)
except KeyboardInterrupt:
print("(Cancelled)")
break
except:
print("*** round tripping aborted ***")
traceback.print_exc()
report.write(
"=============================================================\n"
)
report.write(" An exception occurred while round tripping")
report.write(' "%s"\n' % ttFile)
traceback.print_exc(file=report)
report.write(
"-------------------------------------------------------------\n"
)
main(sys.argv[1:])
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