brand new round trip tool

git-svn-id: svn://svn.code.sf.net/p/fonttools/code/trunk@347 4cde692c-a291-49d1-8350-778aa11640f8

MetaTools/roundTrip.py

@@ -0,0 +1,98 @@
+#! /usr/bin/env python
+
+"""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 ttdump's command line options (-i, -t
+    and -x) and they will in fact be passed to ttdump. Specifying -t
+    or -x implies ttcompile -i <originalfile> on the way back.
+
+    Normally all output from ttdump and ttcompile is suppressed,
+    -v (verbose) causes it to be shown.
+"""
+
+
+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.mktemp(".%s.ttx1" % fn)
+	ttFile2 = tempfile.mktemp(".%s" % fn)
+	xmlFile2 = tempfile.mktemp(".%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 -c2 -I ".*modified value\|checkSumAdjustment.*" "%s" "%s"' % (xmlFile1, xmlFile2)
+		output = os.popen(diffcmd, "r", 1)
+		lines = []
+		while 1:
+			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:v")
+	except getopt.GetoptError:
+		usage()
+	
+	if not files:
+		usage()
+	
+	report = open("report.txt", "a+")
+	options = ttx.Options(rawOptions, len(files))
+	for ttFile in files:
+		try:
+			roundTrip(ttFile, options, report)
+		except KeyboardInterrupt:
+			print "(Cancelled)"
+		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")
+	report.close()
+
+	
+main(sys.argv[1:])