Function TrimRunsInString

be/src/gutil/strings/strip.cc:355–376

---------------------------------------------------------------------- TrimRunsInString Removes leading and trailing runs, and collapses middle runs of a set of characters into a single character (the first one specified in 'remove'). Useful for collapsing runs of repeated delimiters, whitespace, etc. E.g., TrimRunsInString(&s, " :,()") removes leading and trailing delimiter chars and collapses

//    "first,last::(area)phone, ::zip" -> "first last area phone zip"
// ----------------------------------------------------------------------
void TrimRunsInString(string* s, StringPiece remove) {
  string::iterator dest = s->begin();
  string::iterator src_end = s->end();
  for (string::iterator src = s->begin(); src != src_end; ) {
    if (remove.find(*src) == StringPiece::npos) {
      *(dest++) = *(src++);
    } else {
      // Skip to the end of this run of chars that are in 'remove'.
      for (++src; src != src_end; ++src) {
        if (remove.find(*src) == StringPiece::npos) {
          if (dest != s->begin()) {
            // This is an internal run; collapse it.
            *(dest++) = remove[0];
          }
          *(dest++) = *(src++);
          break;
        }
      }
    }
  }
  s->erase(dest, src_end);
}

// ----------------------------------------------------------------------
// RemoveNullsInString