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/*
* This file is part of libdom.
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2021 Michael Drake <tlsa@netsurf-browser.org>
*/
/** \file
* This is an API for walking a loaded DOM.
*/
#ifndef dom_walk_h_
#define dom_walk_h_
enum dom_walk_stage {
DOM_WALK_STAGE_ENTER,
DOM_WALK_STAGE_LEAVE,
};
enum dom_walk_enable {
DOM_WALK_ENABLE_ENTER = (1 << DOM_WALK_STAGE_ENTER),
DOM_WALK_ENABLE_LEAVE = (1 << DOM_WALK_STAGE_LEAVE),
DOM_WALK_ENABLE_ALL = DOM_WALK_ENABLE_ENTER | DOM_WALK_ENABLE_LEAVE,
};
enum dom_walk_cmd {
DOM_WALK_CMD_CONTINUE, /**< Continue the tree walk. */
DOM_WALK_CMD_ABORT, /**< Early termination of the tree walk. */
DOM_WALK_CMD_SKIP, /**< Skip children (only for \ref DOM_WALK_ENABLE_ENTER). */
};
/**
* DOM walking callback.
*
* Client callback for DOM walk.
*
* \param[in] stage Whether the \ref node is being entered or left.
* \param[in] node The node being walked. Client must take ref itself.
* \param[in] type The node type.
* \param[in] pw Client private data.
* \return Tree walking client command.
*/
typedef enum dom_walk_cmd (*dom_walk_cb)(
enum dom_walk_stage stage,
dom_node_type type,
dom_node *node,
void *pw);
/**
* Walk a DOM subtree.
*
* \param[in] mask Mask of stages to enable callback for.
* \param[in] cb The client callback function.
* \param[in] root Node to start walk from.
* \param[in] pw The client's private data.
* \return false for early termination of walk, true otherwise.
*/
dom_exception libdom_treewalk(
enum dom_walk_enable mask,
dom_walk_cb cb,
dom_node *root,
void *pw);
#endif
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