Support for Python 3 about asymptote

[mojca]

The above mentioned problem has been addressed by replacing

controls = [map(eval,a.replace("controls","").split("and")) for a in tokens if a.startswith("controls")]

with

[eval(a.replace("controls", "").split("and")) for a in tokens if a.startswith("controls")]

in GUI/xasyFile.py.

The next problem seems to be fin.readline() from asyfyThread in xasy2asy.py which doesn't seem to be able to read anything. This might be related to some problems in Popen or os.fdopen, but it's not yet clear what exactly is going on.

Below is a standalone example to reproduce the problem:

#!/usr/bin/env python

import sys,os,signal,subprocess,threading,tempfile

AsyTempDir=tempfile.mkdtemp(prefix="asy_")+os.sep
print("AsyTempDir: '{}'".format(AsyTempDir))

(rx,wx) = os.pipe()
(ra,wa) = os.pipe()
cmd = ['asy',"-noV","-multiline","-q", "-o"+AsyTempDir,"-inpipe="+str(rx),"-outpipe="+str(wa)]
print(cmd)

# when close_fds=True, it hangs on 2.7 as well
quickAsy=subprocess.Popen(cmd,close_fds=False)
fout=os.fdopen(wx,'w')
fin=os.fdopen(ra,'r')

#######
fout.write("reset;\n")
fout.write("initXasyMode();\n")
fout.write("atexit(null);\n")
fout.write('xformStack.push((0, 0, 1, 0, 0, 1));\n')
fout.write('label(Label("test",(0, 0),rgb(0,0,0)+0.5,align=SE));\n')
fout.write('deconstruct(1.000000);\n')
fout.flush()

text = fin.readline()
print("    readline:")
print("'{}'".format(text))
fout.write("exit;\n");

fin.close()
fout.close()

The parameter close_fds=False doesn't seem to make any difference in Python 3 (it's set to False in Python 2 and to True in Python 3 by default), but if I set it to True, then Python 2 hangs as well.

[mojca]

I fixed the problem with pipes thanks to some great answers from MacPorters and will describe more details soon.

John, is the second replacement for oneLiner OK?

Old code:

oneLiner = "".join(split(join(pathStrLines)))

New code:

# oneLiner = "".join(" ".join(pathStrLines).split()) # this is literal translation
oneLiner = "".join(pathStrLines).replace(" ", "") # this is probably more straightforward