java - JTextPane Syntax Highlighting Offsets Are Incorrect -


i creating text editor syntax highlighting in java using jtextpane. when run program, output: https://www.dropbox.com/s/kkce9xvtriujizy/output.jpg?dl=0

i want every html tag highlighted pink, after few tags begins highlight wrong areas.

here highlighting code:

    private void htmlhighlight() {     string texttoscan;         texttoscan = txtredit.gettext();         styleddocument doc = txtredit.getstyleddocument();          simpleattributeset sas = new simpleattributeset();         while(texttoscan.contains(">")) {             styleconstants.setforeground(sas, new color(0xeb13b1));             styleconstants.setbold(sas, true);             doc.setcharacterattributes(texttoscan.indexof('<'), texttoscan.indexof('>'), sas, false);             styleconstants.setforeground(sas, color.black);             styleconstants.setbold(sas, false);             texttoscan = texttoscan.substring(texttoscan.indexof('>') + 1, texttoscan.length());         }  }

thanks in advance!

the second argument of setcharacterattributes length, not end index.

this gives us:

    private void htmlhighlight() {     string texttoscan;         texttoscan = txtredit.gettext();         styleddocument doc = txtredit.getstyleddocument();          simpleattributeset sas = new simpleattributeset();         while(texttoscan.contains(">")) {             styleconstants.setforeground(sas, new color(0xeb13b1));             styleconstants.setbold(sas, true);             int start = texttoscan.indexof('<');             int end = texttoscan.indexof('>')+1;             doc.setcharacterattributes(start, end-start, sas, false);             texttoscan = texttoscan.substring(texttoscan.indexof('>') + 1, texttoscan.length());         }  }

update:

the substring problem, without it, there still offset, perhaps due end of lines. solution have found recreate new document:

try {     string texttoscan;     texttoscan = txtredit.gettext();     styleddocument doc = new defaultstyleddocument();     simpleattributeset sas = new simpleattributeset();     styleconstants.setforeground(sas, new color(0xeb13b1));     styleconstants.setbold(sas, true);     int end = 0;     while (true) {         int start = texttoscan.indexof('<', end);         if (start < 0) {             doc.insertstring(end, texttoscan.substring(end), null);             break;         }         doc.insertstring(end, texttoscan.substring(end, start), null);         end = texttoscan.indexof('>', start+1);         if (end < 0) {             doc.insertstring(start, texttoscan.substring(start), sas);             break;         }         ++end;         doc.insertstring(start, texttoscan.substring(start, end), sas);     }     txtredit.setstyleddocument(doc); } catch (badlocationexception ex) {     logger.getlogger(mydialog.class.getname()).log(level.severe, null, ex); }

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