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This page shows some generated pseudo-code from rule constructs.

Rule modifiers and grammar attributes (like pin, recoverWhile) will add some lines.

List

Sequence

rule ::= part1 part2 part3

public boolean rule() {
  <header>
  boolean result = false;
  result = part1();
  result = result && part2();
  result = result && part3();
  if (!result) <rollback any state changes>
  <footer>
  return result;
}

Ordered choice

rule ::= part1 | part2 | part3

public boolean rule() {
  <header>
  boolean result = false;
  result = part1();
  if (!result) result = part2();
  if (!result) result = part3();
  if (!result) <rollback any state changes>
  <footer>
  return result;
}

Zero-or-more

rule ::= part *

public boolean rule() {
  <header>
  while (true) {
    if (!part()) break;
  }
  <footer>
  return true;
}