Function isBoundary

src/codemirror.js:12760–12763

(i, dir, any)

      var start, end, i = line;
      function isEmpty(i) { return !cm.getLine(i); }
      function isBoundary(i, dir, any) {
        if (any) { return isEmpty(i) != isEmpty(i + dir); }
        return !isEmpty(i) && isEmpty(i + dir);
      }
      if (dir) {
        while (min <= i && i <= max && repeat > 0) {
          if (isBoundary(i, dir)) { repeat--; }