Re: [Boa Users] Difference and match(string, string) and string == string

[Hoan Nguyen]

== checks if 2 strings are identical

match search for a match of the regular expression in the first argument within the second argument.

http://boa.cs.iastate.edu/docs/functions.php#match

If you want to check if a file name is AndroidManifest.xml or not, I would say go with ==.

On Tue, Mar 21, 2017 at 2:01 PM, Marcus Adriano <marcusadri...@gmail.com> wrote:

Hi guys,

I'm newer here and I'm research around Android Projects, so what is the difference between these code:

the first:

p: Project = input;

isAndroidProject := false;

count: output sum of int;

visit(p, visitor{

     

        before rev: Revision -> {

              exists(i:int; "AndroidManifest.xml" == rev.files[i].name) {

                    test[p.name] << rev.files[i].name + " | " + rev.log;

                   isAndroidProject = true;

                       stop;

          }

              stop;

  }

     

        before cr: CodeRepository -> {

         foreach (i:int; def(cr.revisions[i]))

                  visit(cr.revisions[i]);

               

                if (!isAndroidProject)

                 stop;

                 

                count << 1;

            snapshot := getsnapshot(cr, "SOURCE_JAVA_JLS");

        foreach (i:int; def(snapshot[i]))

                      visit(snapshot[i]);

            stop;

  }

});

the second:

p: Project = input;

isAndroidProject := false;

count: output sum of int;

visit(p, visitor{

     

        before rev: Revision -> {

              exists(i:int; match("AndroidManifest.xml", rev.files[i].name)) {

                    test[p.name] << rev.files[i].name + " | " + rev.log;

                   isAndroidProject = true;

                       stop;

          }

              stop;

  }

     

        before cr: CodeRepository -> {

         foreach (i:int; def(cr.revisions[i]))

                  visit(cr.revisions[i]);

               

                if (!isAndroidProject)

                 stop;

                 

                count << 1;

            snapshot := getsnapshot(cr, "SOURCE_JAVA_JLS");

        foreach (i:int; def(snapshot[i]))

                      visit(snapshot[i]);

            stop;

  }

});

NOTE: the difference is the "match" and "==" to compare the file in the revision is a AndroidManifest.xml file. 

Which of these codes is the best for the answer "Number of Android Projects on GitHub?"?

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[Robert E Dyer]

Hoan is exactly right.  If the filename is actually ‘SomeAndroidManifest.xml’ then match() would return true, while the == would return false.

So if you want exact match, use == always.

- Robert

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________________________________________________

Robert Dyer | Assistant Professor | Department of Computer Science
BGSU | rd...@bgsu.edu | 419.372.3469 | 244 Hayes | Bowling Green, OH

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