#669 New functions: 'is_dir()' and ' is_file()'

[Erik Hänel]

Create new string functions for detecting, whether a path is (or could be) a file or a directory. The signatures are as follows:

is_dir(sPath) -> LOG
is_file(sPath) -> LOG

Analysis:

Distinguishing between files and folders is not a simple task. First thing is to ensure that the string actually follows path syntax conventions. Remember that NumeRe accepts Windows and UNIX path separators. If that is successful, one can check, if the file exists using the fileExists() function. In this case, it is a file. Otherwise, it is either not a file or it does not exist. These two cases might be separated by checking for a file extension within the last part of the string. It might also be reasonable to use another approach using wxWidgets functionalities like the wxFileName class. (see https://docs.wxwidgets.org/3.0/classwx_file_name.html)

Implementation:

• Implementation: Wrote the functions without using the existing wxWidget functions, as these did not have the expected behavior. The strings are parsed manually and different criteria are checked, including the structure set by folder seperators / and \, and the usage of special characters.
• Revision: [r1159]
• Implementation test: Tested various relevant strings including special cases that could be critical for the functions. This includes network paths, foldernames that contain a "." or special path operators within the string.

Documentation:

• [x] ChangesLog updated
• [x] Code changes commented
• Documentation articles:
  • [ ] corresponding documentation articles updated
  • [ ] new documentation articles created
  • [x] not needed
• Language files:
  • [x] corresponding language files updated
  • [ ] not needed

Tests:

Both functions are part of the automatic SW tests. All deviations were resolved.