Method execFor

src/main/java/net/starlark/java/eval/Eval.java:129–160

(StarlarkThread.Frame fr, ForStatement node)

  }

  private static TokenKind execFor(StarlarkThread.Frame fr, ForStatement node)
      throws EvalException, InterruptedException {
    Iterable<?> seq = evalAsIterable(fr, node.getCollection());
    EvalUtils.addIterator(seq);
    try {
      for (Object it : seq) {
        assign(fr, node.getVars(), it);

        switch (execStatements(fr, node.getBody(), /* indented= */ true)) {
          case PASS:
          case CONTINUE:
            // Stay in loop.
            fr.thread.checkInterrupt();
            continue;
          case BREAK:
            // Finish loop, execute next statement after loop.
            return TokenKind.PASS;
          case RETURN:
            // Finish loop, return from function.
            return TokenKind.RETURN;
          default:
            throw new IllegalStateException("unreachable");
        }
      }
    } catch (EvalException ex) {
      fr.setErrorLocation(node.getStartLocation());
      throw ex;
    } finally {
      EvalUtils.removeIterator(seq);
    }
    return TokenKind.PASS;
  }

  private static StarlarkFunction newFunction(StarlarkThread.Frame fr, Resolver.Function rfn)
      throws EvalException, InterruptedException {