Method onPatternInternal

guava/src/com/google/common/base/Splitter.java:211–232

Internal utility; see {@link #on(Pattern)} instead.

(CommonPattern separatorPattern)

  /** Internal utility; see {@link #on(Pattern)} instead. */
  static Splitter onPatternInternal(CommonPattern separatorPattern) {
    checkArgument(
        !separatorPattern.matcher("").matches(),
        "The pattern may not match the empty string: %s",
        separatorPattern);

    return new Splitter(
        (splitter, toSplit) -> {
          CommonMatcher matcher = separatorPattern.matcher(toSplit);
          return new SplittingIterator(splitter, toSplit) {
            @Override
            public int separatorStart(int start) {
              return matcher.find(start) ? matcher.start() : -1;
            }

            @Override
            public int separatorEnd(int separatorPosition) {
              return matcher.end();
            }
          };
        });
  }

  /**
   * Returns a splitter that considers any subsequence matching a given pattern (regular expression)