Test failures on Python 3.6.5

[alex3kov]

dex --test
**********************************************************************
File "/usr/bin/dex", line 389, in __main__.Application._build_cmd
Failed example:
    Application._build_cmd('"gvim test" test2 "test \\" 3"')
Exception raised:
    Traceback (most recent call last):
      File "/usr/lib/python3.6/doctest.py", line 1330, in __run
        compileflags, 1), test.globs)
      File "<doctest __main__.Application._build_cmd[4]>", line 1, in <module>
        Application._build_cmd('"gvim test" test2 "test \\" 3"')
      File "/usr/bin/dex", line 501, in _build_cmd
        raise ApplicationExecException('Exec value contains an unbalanced number of quote characters.')
    ApplicationExecException: 'Exec value contains an unbalanced number of quote characters.'
**********************************************************************
File "/usr/bin/dex", line 391, in __main__.Application._build_cmd
Failed example:
    Application._build_cmd(r'"test \\\\ \" moin" test')
Exception raised:
    Traceback (most recent call last):
      File "/usr/lib/python3.6/doctest.py", line 1330, in __run
        compileflags, 1), test.globs)
      File "<doctest __main__.Application._build_cmd[5]>", line 1, in <module>
        Application._build_cmd(r'"test \\\\ \" moin" test')
      File "/usr/bin/dex", line 501, in _build_cmd
        raise ApplicationExecException('Exec value contains an unbalanced number of quote characters.')
    ApplicationExecException: 'Exec value contains an unbalanced number of quote characters.'
**********************************************************************
File "/usr/bin/dex", line 393, in __main__.Application._build_cmd
Failed example:
    Application._build_cmd(r'"gvim \\\\ \`test\$"')
Expected:
    ['gvim \\ `test$']
Got:
    ['gvim \\\\ \\`test\\$']
**********************************************************************
1 items had failures:
   3 of  25 in __main__.Application._build_cmd
***Test Failed*** 3 failures.

[tardypad]

Not sure if it is related to the actual same failing tests or if this another not covered case

Exec=termite --exec "vim '\"yo\"'"

This is valid according to desktop-file-validate utility
but also raise the following error with dex
'Exec value contains an unbalanced number of quote characters.'

Using Python 3.6.6

[jceb]

Thanks for reporting. I'll look into it .. there seem to be some differences with python3.

[jceb]

I disabled the failing tests for the moment. Couldn't figure out what the issue was :-/

[reporter123]

It looks python 3.6+ automatically processes escape sequences when looping through the characters in a string with:

   for c in _tmp:
    ...

Using a numeric index bypasses this behavior.

This appears to be a false lead on further review.

After testing with both versions of the loop I discovered a bug in dex. The escape sequence detection is turned off inside strings that appends '\' to the second parameter and makes the code interpret the escaped quote as an un-escaped one.