Implementation of conversion from DOM tree to box tree. More...

#include <string.h>
#include <dom/dom.h>
#include "utils/errors.h"
#include "utils/nsoption.h"
#include "utils/corestrings.h"
#include "utils/talloc.h"
#include "utils/ascii.h"
#include "utils/nsurl.h"
#include "utils/utils.h"
#include "netsurf/misc.h"
#include "css/select.h"
#include "desktop/gui_internal.h"
#include "html/private.h"
#include "html/object.h"
#include "html/box.h"
#include "html/box_manipulate.h"
#include "html/box_construct.h"
#include "html/box_special.h"
#include "html/box_normalise.h"
#include "html/form_internal.h"

Include dependency graph for box_construct.c:

Data Structures
struct	box_construct_ctx
	Context for box tree construction. More...

struct	box_construct_props
	Transient properties for construction of current node. More...

Functions
static bool	box_is_root (dom_node *n)
	determine if a box is the root node More...

static void	box_extract_properties (dom_node n, struct box_construct_props props)
	Extract transient construction properties. More...

static css_select_results *	box_get_style (html_content c, const css_computed_style parent_style, const css_computed_style root_style, dom_node n)
	Get the style for an element. More...

static void	box_construct_generate (dom_node n, html_content content, struct box box, const css_computed_style style)
	Construct the box required for a generated element. More...

static bool	box_construct_marker (struct box box, const char title, struct box_construct_ctx ctx, struct box parent)
	Construct a list marker box. More...

static bool	box__style_is_float (const struct box *box)

static bool	box__is_flex (const struct box *box)

static bool	box__containing_block_is_flex (const struct box_construct_props *props)

static bool	box_construct_element (struct box_construct_ctx ctx, bool convert_children)
	Construct the box tree for an XML element. More...

static void	box_construct_element_after (dom_node n, html_content content)
	Complete construction of the box tree for an element. More...

static dom_node *	next_node (dom_node n, html_content content, bool convert_children)
	Find the next node in the DOM tree, completing element construction where appropriate. More...

static void	box_text_transform (char *s, unsigned int len, enum css_text_transform_e tt)
	Apply the CSS text-transform property to given text for its ASCII chars. More...

static bool	box_construct_text (struct box_construct_ctx *ctx)
	Construct the box tree for an XML text node. More...

static void	convert_xml_to_box (struct box_construct_ctx *ctx)
	Convert an ELEMENT node to a box tree fragment, then schedule conversion of the next ELEMENT node. More...

nserror	dom_to_box (dom_node n, html_content c, box_construct_complete_cb cb, void **box_conversion_context)
	Construct a box tree from a dom and html content. More...

nserror	cancel_dom_to_box (void *box_conversion_context)
	aborts any ongoing box construction More...

struct box *	box_for_node (dom_node *n)
	Retrieve the box for a dom node, if there is one. More...

bool	box_extract_link (const html_content content, const dom_string dsrel, nsurl base, nsurl *result)

Variables
static const content_type	image_types = CONTENT_IMAGE

static const box_type	box_map []

Detailed Description

Implementation of conversion from DOM tree to box tree.

Definition in file box_construct.c.

Function Documentation

◆ box__containing_block_is_flex()

static bool box__containing_block_is_flex ( const struct box_construct_props * props )

inlinestatic

Definition at line 457 of file box_construct.c.

References box__is_flex(), and box_construct_props::containing_block.

Referenced by box_construct_element().

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◆ box__is_flex()

static bool box__is_flex ( const struct box * box )

inlinestatic

Definition at line 452 of file box_construct.c.

References BOX_FLEX, BOX_INLINE_FLEX, and box::type.

Referenced by box__containing_block_is_flex().

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◆ box__style_is_float()

static bool box__style_is_float ( const struct box * box )

inlinestatic

Definition at line 446 of file box_construct.c.

References box::style.

Referenced by box_construct_element().

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◆ box_construct_element()

static bool box_construct_element	(	struct box_construct_ctx *	ctx,
		bool *	convert_children
	)

static

Construct the box tree for an XML element.

Parameters

ctx	Tree construction context
convert_children	Whether to convert children

Returns: true on success, false on memory exhaustion

Definition at line 472 of file box_construct.c.

References box_construct_ctx::bctx, form_control::box, box__containing_block_is_flex(), box__style_is_float(), box_add_child(), BOX_BLOCK, BOX_BR, box_construct_generate(), box_construct_marker(), box_create(), box_extract_properties(), BOX_FLEX, BOX_FLOAT_LEFT, BOX_FLOAT_RIGHT, box_get_style(), BOX_INLINE, BOX_INLINE_BLOCK, BOX_INLINE_CONTAINER, BOX_INLINE_FLEX, box_map, BOX_NONE, clamp, box::columns, box_construct_props::containing_block, box_construct_ctx::content, CONVERT_CHILDREN, convert_special_elements(), box::flags, box::gadget, box_construct_props::href, html_fetch_object(), image_types, box_construct_props::inline_container, IS_REPLACED, box_construct_ctx::n, box::node, box_construct_props::node_is_root, ns_computed_display(), ns_computed_display_static(), NSERROR_OK, nsoption_bool, nsurl_create(), nsurl_unref(), box_construct_props::parent_style, box_construct_ctx::root_box, box::rows, squash_whitespace(), box::style, box::styles, talloc_strdup(), box_construct_props::target, box_construct_props::title, and box::type.

Referenced by convert_xml_to_box().

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◆ box_construct_element_after()

static void box_construct_element_after	(	dom_node *	n,
		html_content *	content
	)

static

Complete construction of the box tree for an element.

Parameters

n	DOM node to construct for
content	Containing document

This will be called after all children of an element have been processed

Definition at line 773 of file box_construct.c.

References box_add_child(), BOX_BR, box_construct_generate(), box_create(), box_extract_properties(), box_for_node(), BOX_INLINE, BOX_INLINE_CONTAINER, BOX_INLINE_END, box_construct_props::containing_block, CONVERT_CHILDREN, box::flags, box::href, box::id, box_construct_props::inline_container, box::inline_end, IS_REPLACED, box::style, box::styles, box::target, box::title, and box::type.

Referenced by next_node().

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◆ box_construct_generate()

static void box_construct_generate	(	dom_node *	n,
		html_content *	content,
		struct box *	box,
		const css_computed_style *	style
	)

static

Construct the box required for a generated element.

Parameters

n	XML node of type XML_ELEMENT_NODE
content	Content of type CONTENT_HTML that is being processed
box	Box which may have generated content
style	Complete computed style for pseudo element, or NULL

Todo:: This is currently incomplete. It just does enough to support the clearfix hack. (http://www.positioniseverything.net/easyclearing.html )

Todo:: Not wise to drop const from the computed style

Definition at line 313 of file box_construct.c.

References box_add_child(), BOX_BLOCK, box_create(), box_is_root(), box_map, ns_computed_display(), box::style, and box::type.

Referenced by box_construct_element(), and box_construct_element_after().

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◆ box_construct_marker()

static bool box_construct_marker	(	struct box *	box,
		const char *	title,
		struct box_construct_ctx *	ctx,
		struct box *	parent
	)

static

Construct a list marker box.

Parameters

box	Box to attach marker to
title	Current title attribute
ctx	Box construction context
parent	Current block-level container

Returns: true on success, false on memory exhaustion

Todo:: marker content (list-style-type)

Definition at line 368 of file box_construct.c.

References box_construct_ctx::bctx, BOX_BLOCK, box_create(), box_construct_ctx::content, html_fetch_object(), image_types, box::length, box::list_marker, NSERROR_OK, nsoption_bool, nsurl_create(), nsurl_unref(), box::parent, box::style, box::text, box::title, and box::type.

Referenced by box_construct_element().

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◆ box_construct_text()

static bool box_construct_text ( struct box_construct_ctx * ctx )

static

Construct the box tree for an XML text node.

Parameters

ctx	Tree construction context

Returns: true on success, false on memory exhaustion

Todo:: Dropping const here is not clever

Todo:: Dropping const isn't clever

Definition at line 993 of file box_construct.c.

References box_construct_ctx::bctx, box_add_child(), box_create(), box_extract_properties(), BOX_INLINE_CONTAINER, BOX_TEXT, box_text_transform(), box_construct_props::containing_block, box::flags, box_construct_props::href, box_construct_props::inline_container, box::last, box::length, box_construct_ctx::n, box_construct_props::parent_style, PRE_STRIP, box::prev, box::space, squash_whitespace(), talloc_strdup(), box_construct_props::target, box::text, text(), box_construct_props::title, box::type, and UNKNOWN_WIDTH.

Referenced by convert_xml_to_box().

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◆ box_extract_link()

bool box_extract_link	(	const html_content *	content,
		const dom_string *	dsrel,
		nsurl *	base,
		nsurl **	result
	)

Definition at line 1388 of file box_construct.c.

References ascii_is_space(), base, NSERROR_OK, nsurl_join(), and result.

Referenced by box_a(), box_create_frameset(), box_embed(), box_iframe(), box_image(), box_object(), and imagemap_addtolist().

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◆ box_extract_properties()

static void box_extract_properties	(	dom_node *	n,
		struct box_construct_props *	props
	)

static

Extract transient construction properties.

Parameters

n	Current DOM node to convert
props	Property object to populate

Definition at line 155 of file box_construct.c.

References BOX_BR, box_for_node(), BOX_INLINE, BOX_INLINE_CONTAINER, box_is_root(), box_construct_props::containing_block, box::href, box_construct_props::href, box_construct_props::inline_container, box::last, box_construct_props::node_is_root, parent_node(), box_construct_props::parent_style, box::style, box::target, box_construct_props::target, box::title, box_construct_props::title, and box::type.

Referenced by box_construct_element(), box_construct_element_after(), and box_construct_text().

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◆ box_for_node()

struct box * box_for_node ( struct dom_node * node )

Retrieve the box for a dom node, if there is one.

Parameters

node	The DOM node

Returns: The box if there is one

Definition at line 1373 of file box_construct.c.

Referenced by box_construct_element_after(), box_extract_properties(), html_texty_element_update(), and next_node().

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◆ box_get_style()

static css_select_results * box_get_style	(	html_content *	c,
		const css_computed_style *	parent_style,
		const css_computed_style *	root_style,
		dom_node *	n
	)

static

Get the style for an element.

Parameters

c	content of type CONTENT_HTML that is being processed
parent_style	style at this point in xml tree, or NULL for root
root_style	root node's style, or NULL for root
n	node in xml tree

Returns: the new style, or NULL on memory exhaustion

Definition at line 248 of file box_construct.c.

References nscss_select_ctx::base_url, html_content::base_url, nscss_select_ctx::ctx, html_content::encoding, html_content::media, nscss_create_inline_style(), nscss_get_style(), nsoption_bool, nsurl_access(), nscss_select_ctx::parent_style, nscss_select_ctx::quirks, html_content::quirks, nscss_select_ctx::root_style, html_content::select_ctx, box::styles, html_content::unit_len_ctx, nscss_select_ctx::universal, and html_content::universal.

Referenced by box_construct_element().

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◆ box_is_root()

static bool box_is_root ( dom_node * n )

inlinestatic

determine if a box is the root node

Parameters

n	node to check

Returns: true if node is root else false.

Definition at line 123 of file box_construct.c.

References parent, and type.

Referenced by box_construct_generate(), box_extract_properties(), and next_node().

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◆ box_text_transform()

static void box_text_transform	(	char *	s,
		unsigned int	len,
		enum css_text_transform_e	tt
	)

static

Apply the CSS text-transform property to given text for its ASCII chars.

Parameters

s	string to transform
len	length of s
tt	transform type

Definition at line 957 of file box_construct.c.

References ascii_is_space(), ascii_to_lower(), and ascii_to_upper().

Referenced by box_construct_text().

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◆ cancel_dom_to_box()

nserror cancel_dom_to_box ( void * box_conversion_context )

aborts any ongoing box construction

Definition at line 1355 of file box_construct.c.

References convert_xml_to_box(), guit, netsurf_table::misc, box_construct_ctx::n, NSERROR_OK, and gui_misc_table::schedule.

Referenced by html_destroy().

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◆ convert_xml_to_box()

static void convert_xml_to_box ( struct box_construct_ctx * ctx )

static

Convert an ELEMENT node to a box tree fragment, then schedule conversion of the next ELEMENT node.

Todo:: Remove box_normalise_block

Definition at line 1234 of file box_construct.c.

References BOX_BLOCK, box_construct_element(), box_construct_text(), box_normalise_block(), box_construct_ctx::cb, box_construct_ctx::content, convert_xml_to_box(), guit, html_content::layout, netsurf_table::misc, box_construct_ctx::n, box::next, next_node(), box::parent, root, box_construct_ctx::root_box, gui_misc_table::schedule, and type.

Referenced by cancel_dom_to_box(), convert_xml_to_box(), and dom_to_box().

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◆ dom_to_box()

nserror dom_to_box	(	struct dom_node *	n,
		struct html_content *	c,
		box_construct_complete_cb	cb,
		void **	box_conversion_context
	)

Construct a box tree from a dom and html content.

Parameters

n	dom document
c	content of type CONTENT_HTML to construct box tree in
cb	callback to report conversion completion
box_conversion_context	pointer that recives the conversion context

Returns: netsurf error code indicating status of call

Definition at line 1320 of file box_construct.c.

References box_construct_ctx::bctx, html_content::bctx, box_construct_ctx::cb, box_construct_ctx::content, convert_xml_to_box(), guit, netsurf_table::misc, box_construct_ctx::n, NSERROR_NOMEM, box_construct_ctx::root_box, gui_misc_table::schedule, and talloc_zero.

Referenced by html_finish_conversion().

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◆ next_node()

static dom_node * next_node	(	dom_node *	n,
		html_content *	content,
		bool	convert_children
	)

static

Find the next node in the DOM tree, completing element construction where appropriate.

Parameters

n	Current node
content	Containing content
convert_children	Whether to consider children of n

Returns: Next node to process, or NULL if complete

Note: n will be unreferenced

Definition at line 845 of file box_construct.c.

References box_construct_element_after(), box_for_node(), box_is_root(), box::next, and parent.

Referenced by convert_xml_to_box(), and libdom_find_first_element().

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Variable Documentation

◆ box_map

const box_type box_map[]

static

Initial value:

= {
        BOX_BLOCK,           
        BOX_INLINE,          
        BOX_BLOCK,           
        BOX_BLOCK,           
        BOX_INLINE,          
        BOX_INLINE_BLOCK,    
        BOX_TABLE,           
        BOX_TABLE,           
        BOX_TABLE_ROW_GROUP, 
        BOX_TABLE_ROW_GROUP, 
        BOX_TABLE_ROW_GROUP, 
        BOX_TABLE_ROW,       
        BOX_NONE,            
        BOX_NONE,            
        BOX_TABLE_CELL,      
        BOX_INLINE,          
        BOX_NONE,            
        BOX_FLEX,            
        BOX_INLINE_FLEX,     
        BOX_BLOCK,           
        BOX_INLINE_BLOCK,    
}

Definition at line 92 of file box_construct.c.

Referenced by box_construct_element(), and box_construct_generate().

◆ image_types

const content_type image_types = CONTENT_IMAGE

static

Definition at line 88 of file box_construct.c.

Referenced by box_construct_element(), box_construct_marker(), and mimesniff__compute_image().

Data Structures

Functions

Variables

Detailed Description

Function Documentation

◆ box__containing_block_is_flex()

◆ box__is_flex()

◆ box__style_is_float()

◆ box_construct_element()

◆ box_construct_element_after()

◆ box_construct_generate()

◆ box_construct_marker()

◆ box_construct_text()

◆ box_extract_link()

◆ box_extract_properties()

◆ box_for_node()

◆ box_get_style()

◆ box_is_root()

◆ box_text_transform()

◆ cancel_dom_to_box()

◆ convert_xml_to_box()

◆ dom_to_box()

◆ next_node()

Variable Documentation

◆ box_map

◆ image_types