ULP backslash at end of string issue, bug or not?

On 16/04/2016 3:55 a.m., Morten Leikvoll wrote:

This piece of code fails. Is it a bug in strjoin or some general

backslash+chr(0) issue?

 

i=strsplit(lines,t.value,'\n');    //Split a multiline string

for(;i;i--) lines[i-1]+"
";    //Add backslash at the ends

tmpstr=strjoin(lines,'n');    //Merge back with 'n'

 

This should end up with "\n" (two chars) instead of '\n' (linefeed), but

the backslashes simply dissapear.

Hi Morten

Not enough backslashes.

Working backwards

You need an escaped backslash in 'lines[]' so that is 2.

To get those 2 you need to escape them, so that's 4

The following works

int i;

string lines[];

string tmpstr, value = "123 345 678 999";

i=strsplit(lines,value,' ');    //Split a multiline string

for(i;i>0;i--) { lines[i-1]+= "

";    //Add backslash at the end

dlgMessageBox(lines[i-1]);

}

tmpstr=strjoin(lines,'n');    //Merge back with 'n'

dlgMessageBox(tmpstr);

Regards

Warren

On 16/04/2016 5:59 p.m., warrenbrayshaw wrote:

On 16/04/2016 3:55 a.m., Morten Leikvoll wrote:

This piece of code fails. Is it a bug in strjoin or some general

backslash+chr(0) issue?

 

i=strsplit(lines,t.value,'\n');    //Split a multiline string

for(;i;i--) lines[i-1]+"
";    //Add backslash at the ends

tmpstr=strjoin(lines,'n');    //Merge back with 'n'

 

This should end up with "\n" (two chars) instead of '\n' (linefeed), but

the backslashes simply dissapear.

 

Hi Morten

 

Not enough backslashes.

 

Working backwards

You need an escaped backslash in 'lines[]' so that is 2.

To get those 2 you need to escape them, so that's 4

 

The following works

 

 

 

int i;

string lines[];

string tmpstr, value = "123 345 678 999";

i=strsplit(lines,value,' ');    //Split a multiline string

for(i;i>0;i--) { lines[i-1]+= "

";    //Add backslash at the end

dlgMessageBox(lines[i-1]);

}

tmpstr=strjoin(lines,'n');    //Merge back with 'n'

dlgMessageBox(tmpstr);

 

 

 

Regards

Warren

 

 

The issue with my previous example is that it used four backslashes to

provided for the final dlgMessageBox.

If one uses a dlgTextView to display the result,it presents the text

verbatim, as we know, so you can revert to two backslashes thus;

  int i;

string lines[];

string tmpstr, value = "123 345 678 999";

i=strsplit(lines,value,' '); //Split a multiline string

for(i;i>0;i--) { lines[i-1]+= "
"; //Add backslash at the end

//dlgMessageBox(lines[i-1]);

}

tmpstr=strjoin(lines,'n'); //Merge back with 'n'

tmpstr +='n';

//dlgMessageBox(tmpstr);

dlgDialog(""){

dlgTextView(tmpstr);

};

While not the exercise quoted, you could reconstruct using

tmpstr=strjoin(lines,'\n');

thus

  int i;

string lines[];

string tmpstr, value = "123\n345\n678\n999\n";

i=strsplit(lines,value,'\n'); //Split a multiline string

tmpstr=strjoin(lines,'\n'); //Merge back with 'n'

//dlgMessageBox(tmpstr);

dlgDialog(""){

dlgTextView(tmpstr);

};

note that both dlgMessageBox and dlgTextView display this differently so

they are similar but not equivalent.

HTH

Warren

On 16/04/2016 5:59 p.m., warrenbrayshaw wrote:

On 16/04/2016 3:55 a.m., Morten Leikvoll wrote:

This piece of code fails. Is it a bug in strjoin or some general

backslash+chr(0) issue?

 

i=strsplit(lines,t.value,'\n');    //Split a multiline string

for(;i;i--) lines[i-1]+"
";    //Add backslash at the ends

tmpstr=strjoin(lines,'n');    //Merge back with 'n'

 

This should end up with "\n" (two chars) instead of '\n' (linefeed), but

the backslashes simply dissapear.

 

Hi Morten

 

Not enough backslashes.

 

Working backwards

You need an escaped backslash in 'lines[]' so that is 2.

To get those 2 you need to escape them, so that's 4

 

The following works

 

 

 

int i;

string lines[];

string tmpstr, value = "123 345 678 999";

i=strsplit(lines,value,' ');    //Split a multiline string

for(i;i>0;i--) { lines[i-1]+= "

";    //Add backslash at the end

dlgMessageBox(lines[i-1]);

}

tmpstr=strjoin(lines,'n');    //Merge back with 'n'

dlgMessageBox(tmpstr);

 

 

 

Regards

Warren

 

 

The issue with my previous example is that it used four backslashes to

provided for the final dlgMessageBox.

If one uses a dlgTextView to display the result,it presents the text

verbatim, as we know, so you can revert to two backslashes thus;

  int i;

string lines[];

string tmpstr, value = "123 345 678 999";

i=strsplit(lines,value,' '); //Split a multiline string

for(i;i>0;i--) { lines[i-1]+= "
"; //Add backslash at the end

//dlgMessageBox(lines[i-1]);

}

tmpstr=strjoin(lines,'n'); //Merge back with 'n'

tmpstr +='n';

//dlgMessageBox(tmpstr);

dlgDialog(""){

dlgTextView(tmpstr);

};

While not the exercise quoted, you could reconstruct using

tmpstr=strjoin(lines,'\n');

thus

  int i;

string lines[];

string tmpstr, value = "123\n345\n678\n999\n";

i=strsplit(lines,value,'\n'); //Split a multiline string

tmpstr=strjoin(lines,'\n'); //Merge back with 'n'

//dlgMessageBox(tmpstr);

dlgDialog(""){

dlgTextView(tmpstr);

};

note that both dlgMessageBox and dlgTextView display this differently so

they are similar but not equivalent.

HTH

Warren