netsurf/content/handlers/html/box_normalise.h

/*
 * Copyright 2020 Vincent Sanders <vince@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * \file
 * HTML Box tree normalise interface.
 *
 * A box tree is "normalized" if the following is satisfied:
 * \code
 * parent               permitted child nodes
 * BLOCK, INLINE_BLOCK  BLOCK, INLINE_CONTAINER, TABLE
 * INLINE_CONTAINER     INLINE, INLINE_BLOCK, FLOAT_LEFT, FLOAT_RIGHT, BR, TEXT,
 *                      INLINE_END
 * INLINE               none
 * TABLE                at least 1 TABLE_ROW_GROUP
 * TABLE_ROW_GROUP      at least 1 TABLE_ROW
 * TABLE_ROW            at least 1 TABLE_CELL
 * TABLE_CELL           BLOCK, INLINE_CONTAINER, TABLE (same as BLOCK)
 * FLOAT_(LEFT|RIGHT)   exactly 1 BLOCK or TABLE
 * \endcode
 *
 */

#ifndef NETSURF_HTML_BOX_NORMALISE_H
#define NETSURF_HTML_BOX_NORMALISE_H

/**
 * Ensure the box tree is correctly nested by adding and removing nodes.
 *
 * \param block  box of type BLOCK, INLINE_BLOCK, or TABLE_CELL
 * \param root   root box of document
 * \param c      content of boxes
 * \return true on success, false on memory exhaustion
 *
 * The tree is modified to satisfy the following:
 * \code
 * parent               permitted child nodes
 * BLOCK, INLINE_BLOCK  BLOCK, INLINE_CONTAINER, TABLE
 * INLINE_CONTAINER     INLINE, INLINE_BLOCK, FLOAT_LEFT, FLOAT_RIGHT, BR, TEXT
 * INLINE, TEXT         none
 * TABLE                at least 1 TABLE_ROW_GROUP
 * TABLE_ROW_GROUP      at least 1 TABLE_ROW
 * TABLE_ROW            at least 1 TABLE_CELL
 * TABLE_CELL           BLOCK, INLINE_CONTAINER, TABLE (same as BLOCK)
 * FLOAT_(LEFT|RIGHT)   exactly 1 BLOCK or TABLE
 * \endcode
 */
bool box_normalise_block(struct box *block, const struct box *root, struct html_content *c);

#endif