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/*
* Copyright (c) 2019, Juniper Networks, Inc.
* All rights reserved.
* This SOFTWARE is licensed under the LICENSE provided in the
* ../Copyright file. By downloading, installing, copying, or otherwise
* using the SOFTWARE, you agree to be bound by the terms of that
* LICENSE.
*
* Phil Shafer, March 2019
*/
#ifndef XO_EXPLICIT_H
#define XO_EXPLICIT_H
/*
* NOTE WELL: This file is needed to software that implements an
* explicit transition between libxo states on its internal stack.
* General libxo code should _never_ include this header file.
*/
/*
* A word about states: We use a finite state machine (FMS) approach
* to help remove fragility from the caller's code. Instead of
* requiring a specific order of calls, we'll allow the caller more
* flexibility and make the library responsible for recovering from
* missed steps. The goal is that the library should not be capable
* of emitting invalid xml or json, but the developer shouldn't need
* to know or understand all the details about these encodings.
*
* You can think of states as either states or events, since they
* function rather like both. None of the XO_CLOSE_* events will
* persist as states, since the matching stack frame will be popped.
* Same is true of XSS_EMIT, which is an event that asks us to
* prep for emitting output fields.
*/
/* Stack frame states */
typedef unsigned xo_state_t; /* XSS_* values */
#define XSS_INIT 0 /* Initial stack state */
#define XSS_OPEN_CONTAINER 1
#define XSS_CLOSE_CONTAINER 2
#define XSS_OPEN_LIST 3
#define XSS_CLOSE_LIST 4
#define XSS_OPEN_INSTANCE 5
#define XSS_CLOSE_INSTANCE 6
#define XSS_OPEN_LEAF_LIST 7
#define XSS_CLOSE_LEAF_LIST 8
#define XSS_DISCARDING 9 /* Discarding data until recovered */
#define XSS_MARKER 10 /* xo_open_marker's marker */
#define XSS_EMIT 11 /* xo_emit has a leaf field */
#define XSS_EMIT_LEAF_LIST 12 /* xo_emit has a leaf-list ({l:}) */
#define XSS_FINISH 13 /* xo_finish was called */
#define XSS_MAX 13
void
xo_explicit_transition (xo_handle_t *xop, xo_state_t new_state,
const char *tag, xo_xof_flags_t flags);
#endif /* XO_EXPLICIT_H */
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