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