YAML::PP Grammar
- The Tokens are passed to a bottom-up Grammar:
  PLAIN:    match: cb_start_plain    COMMENT:      match: cb_send_scalar      EOL: { return: 1 }    EOL:      match: cb_fetch_tokens_plain      new: RULE_PLAIN_MULTI    WS:      COLON:        match: cb_insert_map        EOL: { node: FULLNODE , return: 1}        WS: { node: FULLMAPVALUE_INLINE, return: 1 }    COLON:      match: cb_insert_map      EOL: { node: FULLNODE , return: 1}      WS: { node: FULLMAPVALUE_INLINE, return: 1 }  COLON: