netsurf/content/handlers/html/box_construct.h
Vincent Sanders e8d0ba15ad split html box processing code
reduce the module size of the html box handling code by
 splitting into smaller sections.

No functional code change.
2020-04-29 20:37:42 +01:00

114 lines
3.8 KiB
C

/*
* 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 construction interface.
*
* This stage of rendering converts a tree of dom_nodes (produced by libdom)
* to a tree of struct box. The box tree represents the structure of the
* document as given by the CSS display and float properties.
*
* For example, consider the following HTML:
* \code
* <h1>Example Heading</h1>
* <p>Example paragraph <em>with emphasised text</em> etc.</p> \endcode
*
* This would produce approximately the following box tree with default CSS
* rules:
* \code
* BOX_BLOCK (corresponds to h1)
* BOX_INLINE_CONTAINER
* BOX_INLINE "Example Heading"
* BOX_BLOCK (p)
* BOX_INLINE_CONTAINER
* BOX_INLINE "Example paragraph "
* BOX_INLINE "with emphasised text" (em)
* BOX_INLINE "etc." \endcode
*
* Note that the em has been collapsed into the INLINE_CONTAINER.
*
* If these CSS rules were applied:
* \code
* h1 { display: table-cell }
* p { display: table-cell }
* em { float: left; width: 5em } \endcode
*
* then the box tree would instead look like this:
* \code
* BOX_TABLE
* BOX_TABLE_ROW_GROUP
* BOX_TABLE_ROW
* BOX_TABLE_CELL (h1)
* BOX_INLINE_CONTAINER
* BOX_INLINE "Example Heading"
* BOX_TABLE_CELL (p)
* BOX_INLINE_CONTAINER
* BOX_INLINE "Example paragraph "
* BOX_FLOAT_LEFT (em)
* BOX_BLOCK
* BOX_INLINE_CONTAINER
* BOX_INLINE "with emphasised text"
* BOX_INLINE "etc." \endcode
*
* Here implied boxes have been added and a float is present.
*/
#ifndef NETSURF_HTML_BOX_CONSTRUCT_H
#define NETSURF_HTML_BOX_CONSTRUCT_H
/**
* Construct a box tree from a dom and html content
*
* \param n dom document
* \param c content of type CONTENT_HTML to construct box tree in
* \param cb callback to report conversion completion
* \param box_conversion_context pointer that recives the conversion context
* \return netsurf error code indicating status of call
*/
nserror dom_to_box(struct dom_node *n, struct html_content *c, box_construct_complete_cb cb, void **box_conversion_context);
/**
* aborts any ongoing box construction
*/
nserror cancel_dom_to_box(void *box_conversion_context);
/**
* Retrieve the box for a dom node, if there is one
*
* \param node The DOM node
* \return The box if there is one
*/
struct box *box_for_node(struct dom_node *node);
/**
* Extract a URL from a relative link, handling junk like whitespace and
* attempting to read a real URL from "javascript:" links.
*
* \param content html content
* \param dsrel relative URL text taken from page
* \param base base for relative URLs
* \param result updated to target URL on heap, unchanged if extract failed
* \return true on success, false on memory exhaustion
*/
bool box_extract_link(const struct html_content *content, const struct dom_string *dsrel, struct nsurl *base, struct nsurl **result);
#endif