Function printStatementSequence

lib/printer.ts:2597–2705

(path: any, options: any, print: any)

}

function printStatementSequence(path: any, options: any, print: any) {
  const filtered: any[] = [];
  let sawComment = false;
  let sawStatement = false;

  path.each(function (stmtPath: any) {
    const stmt = stmtPath.getValue();

    // Just in case the AST has been modified to contain falsy
    // "statements," it's safer simply to skip them.
    if (!stmt) {
      return;
    }

    // Skip printing EmptyStatement nodes to avoid leaving stray
    // semicolons lying around.
    if (
      stmt.type === "EmptyStatement" &&
      !(stmt.comments && stmt.comments.length > 0)
    ) {
      return;
    }

    if (namedTypes.Comment.check(stmt)) {
      // The pretty printer allows a dangling Comment node to act as
      // a Statement when the Comment can't be attached to any other
      // non-Comment node in the tree.
      sawComment = true;
    } else if (namedTypes.Statement.check(stmt)) {
      sawStatement = true;
    } else {
      // When the pretty printer encounters a string instead of an
      // AST node, it just prints the string. This behavior can be
      // useful for fine-grained formatting decisions like inserting
      // blank lines.
      isString.assert(stmt);
    }

    // We can't hang onto stmtPath outside of this function, because
    // it's just a reference to a mutable FastPath object, so we have
    // to go ahead and print it here.
    filtered.push({
      node: stmt,
      printed: print(stmtPath),
    });
  });

  if (sawComment) {
    assert.strictEqual(
      sawStatement,
      false,
      "Comments may appear as statements in otherwise empty statement " +
        "lists, but may not coexist with non-Comment nodes.",
    );
  }

  let prevTrailingSpace: any = null;
  const len = filtered.length;