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netsurf/content/handlers/html/box_special.c

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/*
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
* Copyright 2005 John M Bell <jmb202@ecs.soton.ac.uk>
* Copyright 2006 Richard Wilson <info@tinct.net>
* Copyright 2008 Michael Drake <tlsa@netsurf-browser.org>
* 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
* Implementation of special element handling conversion.
*/
#include <string.h>
#include <stdbool.h>
#include <dom/dom.h>
#include "utils/nsoption.h"
#include "utils/corestrings.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/talloc.h"
#include "utils/string.h"
#include "utils/ascii.h"
#include "utils/nsurl.h"
#include "netsurf/plot_style.h"
#include "css/hints.h"
#include "desktop/frame_types.h"
#include "content/content_factory.h"
#include "html/html.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_textarea.h"
#include "html/form_internal.h"
static const content_type image_types = CONTENT_IMAGE;
/**
* determine if a box is the root node
*
* \param n node to check
* \return true if node is root else false.
*/
static inline bool box_is_root(dom_node *n)
{
dom_node *parent;
dom_node_type type;
dom_exception err;
err = dom_node_get_parent_node(n, &parent);
if (err != DOM_NO_ERR)
return false;
if (parent != NULL) {
err = dom_node_get_node_type(parent, &type);
dom_node_unref(parent);
if (err != DOM_NO_ERR)
return false;
if (type != DOM_DOCUMENT_NODE)
return false;
}
return true;
}
/**
* Destructor for object_params, for &lt;object&gt; elements
*
* \param o The object params being destroyed.
* \return 0 to allow talloc to continue destroying the tree.
*/
static int box_object_talloc_destructor(struct object_params *o)
{
if (o->codebase != NULL)
nsurl_unref(o->codebase);
if (o->classid != NULL)
nsurl_unref(o->classid);
if (o->data != NULL)
nsurl_unref(o->data);
return 0;
}
/**
* Parse a multi-length-list, as defined by HTML 4.01.
*
* \param ds dom string to parse
* \param count updated to number of entries
* \return array of struct box_multi_length, or 0 on memory exhaustion
*/
static struct frame_dimension *
box_parse_multi_lengths(const dom_string *ds, unsigned int *count)
{
char *end;
unsigned int i, n;
struct frame_dimension *length;
const char *s;
s = dom_string_data(ds);
for (i = 0, n = 1; s[i]; i++)
if (s[i] == ',')
n++;
length = calloc(n, sizeof(struct frame_dimension));
if (!length)
return NULL;
for (i = 0; i != n; i++) {
while (ascii_is_space(*s)) {
s++;
}
length[i].value = strtof(s, &end);
if (length[i].value <= 0) {
length[i].value = 1;
}
s = end;
switch (*s) {
case '%':
length[i].unit = FRAME_DIMENSION_PERCENT;
break;
case '*':
length[i].unit = FRAME_DIMENSION_RELATIVE;
break;
default:
length[i].unit = FRAME_DIMENSION_PIXELS;
break;
}
while (*s && *s != ',') {
s++;
}
if (*s == ',') {
s++;
}
}
*count = n;
return length;
}
/**
* Destructor for content_html_frames, for frame elements
*
* \param f The frame params being destroyed.
* \return 0 to allow talloc to continue destroying the tree.
*/
static int box_frames_talloc_destructor(struct content_html_frames *f)
{
if (f->url != NULL) {
nsurl_unref(f->url);
f->url = NULL;
}
return 0;
}
/**
* create a frameset box tree
*/
static bool
box_create_frameset(struct content_html_frames *f,
dom_node *n,
html_content *content)
{
unsigned int row, col, index, i;
unsigned int rows = 1, cols = 1;
dom_string *s;
dom_exception err;
nsurl *url;
struct frame_dimension *row_height = 0, *col_width = 0;
dom_node *c, *next;
struct content_html_frames *frame;
bool default_border = true;
colour default_border_colour = 0x000000;
/* parse rows and columns */
err = dom_element_get_attribute(n, corestring_dom_rows, &s);
if (err == DOM_NO_ERR && s != NULL) {
row_height = box_parse_multi_lengths(s, &rows);
dom_string_unref(s);
if (row_height == NULL)
return false;
} else {
row_height = calloc(1, sizeof(struct frame_dimension));
if (row_height == NULL)
return false;
row_height->value = 100;
row_height->unit = FRAME_DIMENSION_PERCENT;
}
err = dom_element_get_attribute(n, corestring_dom_cols, &s);
if (err == DOM_NO_ERR && s != NULL) {
col_width = box_parse_multi_lengths(s, &cols);
dom_string_unref(s);
if (col_width == NULL) {
free(row_height);
return false;
}
} else {
col_width = calloc(1, sizeof(struct frame_dimension));
if (col_width == NULL) {
free(row_height);
return false;
}
col_width->value = 100;
col_width->unit = FRAME_DIMENSION_PERCENT;
}
/* common extension: border="0|1" to control all children */
err = dom_element_get_attribute(n, corestring_dom_border, &s);
if (err == DOM_NO_ERR && s != NULL) {
if ((dom_string_data(s)[0] == '0') &&
(dom_string_data(s)[1] == '\0'))
default_border = false;
dom_string_unref(s);
}
/* common extension: frameborder="yes|no" to control all children */
err = dom_element_get_attribute(n, corestring_dom_frameborder, &s);
if (err == DOM_NO_ERR && s != NULL) {
if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_no) == 0)
default_border = false;
dom_string_unref(s);
}
/* common extension: bordercolor="#RRGGBB|<named colour>" to control
*all children */
err = dom_element_get_attribute(n, corestring_dom_bordercolor, &s);
if (err == DOM_NO_ERR && s != NULL) {
css_color color;
if (nscss_parse_colour(dom_string_data(s), &color))
default_border_colour = nscss_color_to_ns(color);
dom_string_unref(s);
}
/* update frameset and create default children */
f->cols = cols;
f->rows = rows;
f->scrolling = BW_SCROLLING_NO;
f->children = talloc_array(content->bctx, struct content_html_frames,
(rows * cols));
talloc_set_destructor(f->children, box_frames_talloc_destructor);
for (row = 0; row < rows; row++) {
for (col = 0; col < cols; col++) {
index = (row * cols) + col;
frame = &f->children[index];
frame->cols = 0;
frame->rows = 0;
frame->width = col_width[col];
frame->height = row_height[row];
frame->margin_width = 0;
frame->margin_height = 0;
frame->name = NULL;
frame->url = NULL;
frame->no_resize = false;
frame->scrolling = BW_SCROLLING_AUTO;
frame->border = default_border;
frame->border_colour = default_border_colour;
frame->children = NULL;
}
}
free(col_width);
free(row_height);
/* create the frameset windows */
err = dom_node_get_first_child(n, &c);
if (err != DOM_NO_ERR)
return false;
for (row = 0; c != NULL && row < rows; row++) {
for (col = 0; c != NULL && col < cols; col++) {
while (c != NULL) {
dom_node_type type;
dom_string *name;
err = dom_node_get_node_type(c, &type);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
err = dom_node_get_node_name(c, &name);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
if (type != DOM_ELEMENT_NODE ||
(!dom_string_caseless_lwc_isequal(
name,
corestring_lwc_frame) &&
!dom_string_caseless_lwc_isequal(
name,
corestring_lwc_frameset
))) {
err = dom_node_get_next_sibling(c,
&next);
if (err != DOM_NO_ERR) {
dom_string_unref(name);
dom_node_unref(c);
return false;
}
dom_string_unref(name);
dom_node_unref(c);
c = next;
} else {
/* Got a FRAME or FRAMESET element */
dom_string_unref(name);
break;
}
}
if (c == NULL)
break;
/* get current frame */
index = (row * cols) + col;
frame = &f->children[index];
/* nest framesets */
err = dom_node_get_node_name(c, &s);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_frameset)) {
dom_string_unref(s);
frame->border = 0;
if (box_create_frameset(frame, c,
content) == false) {
dom_node_unref(c);
return false;
}
err = dom_node_get_next_sibling(c, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
dom_node_unref(c);
c = next;
continue;
}
dom_string_unref(s);
/* get frame URL (not required) */
url = NULL;
err = dom_element_get_attribute(c, corestring_dom_src, &s);
if (err == DOM_NO_ERR && s != NULL) {
box_extract_link(content, s, content->base_url,
&url);
dom_string_unref(s);
}
/* copy url */
if (url != NULL) {
/* no self-references */
if (nsurl_compare(content->base_url, url,
NSURL_COMPLETE) == false)
frame->url = url;
url = NULL;
}
/* fill in specified values */
err = dom_element_get_attribute(c, corestring_dom_name, &s);
if (err == DOM_NO_ERR && s != NULL) {
frame->name = talloc_strdup(content->bctx,
dom_string_data(s));
dom_string_unref(s);
}
if (dom_element_has_attribute(c, corestring_dom_noresize,
&frame->no_resize) != DOM_NO_ERR) {
/* If we can't read the attribute for some reason,
* assume we didn't have it.
*/
frame->no_resize = false;
}
err = dom_element_get_attribute(c, corestring_dom_frameborder,
&s);
if (err == DOM_NO_ERR && s != NULL) {
i = atoi(dom_string_data(s));
frame->border = (i != 0);
dom_string_unref(s);
}
err = dom_element_get_attribute(c, corestring_dom_scrolling, &s);
if (err == DOM_NO_ERR && s != NULL) {
if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_yes))
frame->scrolling = BW_SCROLLING_YES;
else if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_no))
frame->scrolling = BW_SCROLLING_NO;
dom_string_unref(s);
}
err = dom_element_get_attribute(c, corestring_dom_marginwidth,
&s);
if (err == DOM_NO_ERR && s != NULL) {
frame->margin_width = atoi(dom_string_data(s));
dom_string_unref(s);
}
err = dom_element_get_attribute(c, corestring_dom_marginheight,
&s);
if (err == DOM_NO_ERR && s != NULL) {
frame->margin_height = atoi(dom_string_data(s));
dom_string_unref(s);
}
err = dom_element_get_attribute(c, corestring_dom_bordercolor,
&s);
if (err == DOM_NO_ERR && s != NULL) {
css_color color;
if (nscss_parse_colour(dom_string_data(s),
&color))
frame->border_colour =
nscss_color_to_ns(color);
dom_string_unref(s);
}
/* advance */
err = dom_node_get_next_sibling(c, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
dom_node_unref(c);
c = next;
}
}
/* If the last child wasn't a frame, we still need to unref it */
if (c != NULL) {
dom_node_unref(c);
}
return true;
}
/**
* Destructor for content_html_iframe, for &lt;iframe&gt; elements
*
* \param f The iframe params being destroyed.
* \return 0 to allow talloc to continue destroying the tree.
*/
static int box_iframes_talloc_destructor(struct content_html_iframe *f)
{
if (f->url != NULL) {
nsurl_unref(f->url);
f->url = NULL;
}
return 0;
}
/**
* Get the value of a dom node element's attribute.
*
* \param n dom element node
* \param attribute name of attribute
* \param context talloc context for result buffer
* \param value updated to value, if the attribute is present
* \return true on success, false if attribute present but memory exhausted
*
* \note returning true does not imply that the attribute was found. If the
* attribute was not found, *value will be unchanged.
*/
static bool
box_get_attribute(dom_node *n,
const char *attribute,
void *context,
char **value)
{
char *result;
dom_string *attr, *attr_name;
dom_exception err;
err = dom_string_create_interned((const uint8_t *) attribute,
strlen(attribute), &attr_name);
if (err != DOM_NO_ERR)
return false;
err = dom_element_get_attribute(n, attr_name, &attr);
if (err != DOM_NO_ERR) {
dom_string_unref(attr_name);
return false;
}
dom_string_unref(attr_name);
if (attr != NULL) {
result = talloc_strdup(context, dom_string_data(attr));
dom_string_unref(attr);
if (result == NULL)
return false;
*value = result;
}
return true;
}
/**
* Helper function for adding textarea widget to box.
*
* This is a load of hacks to ensure boxes replaced with textareas
* can be handled by the layout code.
*/
static bool
box_input_text(html_content *html, struct box *box, struct dom_node *node)
{
struct box *inline_container, *inline_box;
uint8_t display = css_computed_display_static(box->style);
switch (display) {
case CSS_DISPLAY_GRID:
case CSS_DISPLAY_FLEX:
case CSS_DISPLAY_BLOCK:
box->type = BOX_BLOCK;
break;
default:
box->type = BOX_INLINE_BLOCK;
break;
}
inline_container = box_create(NULL, 0, false, 0, 0, 0, 0, html->bctx);
if (!inline_container)
return false;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(NULL, box->style, false, 0, 0, box->title, 0,
html->bctx);
if (!inline_box)
return false;
inline_box->type = BOX_TEXT;
inline_box->text = talloc_strdup(html->bctx, "");
box_add_child(inline_container, inline_box);
box_add_child(box, inline_container);
return box_textarea_create_textarea(html, box, node);
}
/**
* Add an option to a form select control (helper function for box_select()).
*
* \param control select containing the &lt;option&gt;
* \param n xml element node for &lt;option&gt;
* \return true on success, false on memory exhaustion
*/
static bool box_select_add_option(struct form_control *control, dom_node *n)
{
char *value = NULL;
char *text = NULL;
char *text_nowrap = NULL;
bool selected;
dom_string *content, *s;
dom_exception err;
err = dom_node_get_text_content(n, &content);
if (err != DOM_NO_ERR)
return false;
if (content != NULL) {
text = squash_whitespace(dom_string_data(content));
dom_string_unref(content);
} else {
text = strdup("");
}
if (text == NULL)
goto no_memory;
err = dom_element_get_attribute(n, corestring_dom_value, &s);
if (err == DOM_NO_ERR && s != NULL) {
value = strdup(dom_string_data(s));
dom_string_unref(s);
} else {
value = strdup(text);
}
if (value == NULL)
goto no_memory;
if (dom_element_has_attribute(n, corestring_dom_selected, &selected) != DOM_NO_ERR) {
/* Assume not selected if we can't read the attribute presence */
selected = false;
}
/* replace spaces/TABs with hard spaces to prevent line wrapping */
text_nowrap = cnv_space2nbsp(text);
if (text_nowrap == NULL)
goto no_memory;
if (form_add_option(control, value, text_nowrap, selected, n) == false)
goto no_memory;
free(text);
return true;
no_memory:
free(value);
free(text);
free(text_nowrap);
return false;
}
/**
* \name Special case element handlers
*
* These functions are called by box_construct_element() when an element is
* being converted, according to the entries in element_table.
*
* The parameters are the xmlNode, the content for the document, and a partly
* filled in box structure for the element.
*
* Return true on success, false on memory exhaustion. Set *convert_children
* to false if children of this element in the XML tree should be skipped (for
* example, if they have been processed in some special way already).
*
* Elements ordered as in the HTML 4.01 specification. Section numbers in
* brackets [] refer to the spec.
*
* \{
*/
/**
* special element handler for Anchor [12.2].
*/
static bool
box_a(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
bool ok;
nsurl *url;
dom_string *s;
dom_exception err;
err = dom_element_get_attribute(n, corestring_dom_href, &s);
if (err == DOM_NO_ERR && s != NULL) {
ok = box_extract_link(content, s, content->base_url, &url);
dom_string_unref(s);
if (!ok)
return false;
if (url) {
if (box->href != NULL)
nsurl_unref(box->href);
box->href = url;
}
}
/* name and id share the same namespace */
err = dom_element_get_attribute(n, corestring_dom_name, &s);
if (err == DOM_NO_ERR && s != NULL) {
lwc_string *lwc_name;
err = dom_string_intern(s, &lwc_name);
dom_string_unref(s);
if (err == DOM_NO_ERR) {
/* name replaces existing id
* TODO: really? */
if (box->id != NULL)
lwc_string_unref(box->id);
box->id = lwc_name;
}
}
/* target frame [16.3] */
err = dom_element_get_attribute(n, corestring_dom_target, &s);
if (err == DOM_NO_ERR && s != NULL) {
if (dom_string_caseless_lwc_isequal(s,
corestring_lwc__blank))
box->target = "_blank";
else if (dom_string_caseless_lwc_isequal(s,
corestring_lwc__top))
box->target = "_top";
else if (dom_string_caseless_lwc_isequal(s,
corestring_lwc__parent))
box->target = "_parent";
else if (dom_string_caseless_lwc_isequal(s,
corestring_lwc__self))
/* the default may have been overridden by a
* <base target=...>, so this is different to 0 */
box->target = "_self";
else {
/* 6.16 says that frame names must begin with [a-zA-Z]
* This doesn't match reality, so just take anything */
box->target = talloc_strdup(content->bctx,
dom_string_data(s));
if (!box->target) {
dom_string_unref(s);
return false;
}
}
dom_string_unref(s);
}
return true;
}
/**
* Document body special element handler [7.5.1].
*/
static bool
box_body(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
css_color color;
css_computed_background_color(box->style, &color);
if (nscss_color_is_transparent(color)) {
content->background_colour = NS_TRANSPARENT;
} else {
content->background_colour = nscss_color_to_ns(color);
}
return true;
}
/**
* special element handler for forced line break [9.3.2].
*/
static bool
box_br(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
box->type = BOX_BR;
return true;
}
/**
* special element handler for Push button [17.5].
*/
static bool
box_button(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
struct form_control *gadget;
gadget = html_forms_get_control_for_node(content->forms, n);
if (!gadget)
return false;
gadget->html = content;
box->gadget = gadget;
box->flags |= IS_REPLACED;
gadget->box = box;
box->type = BOX_INLINE_BLOCK;
/* Just render the contents */
return true;
}
/**
* Canvas element
*/
static bool
box_canvas(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
/* If scripting is not enabled display the contents of canvas */
if (!content->enable_scripting) {
return true;
}
*convert_children = false;
if (box->style && ns_computed_display(box->style,
box_is_root(n)) == CSS_DISPLAY_NONE)
return true;
/* This is replaced content */
box->flags |= IS_REPLACED | REPLACE_DIM;
return true;
}
/**
* Embedded object (not in any HTML specification:
* see http://wp.netscape.com/assist/net_sites/new_html3_prop.html )
*/
static bool
box_embed(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
struct object_params *params;
struct object_param *param;
dom_namednodemap *attrs;
unsigned long idx;
uint32_t num_attrs;
dom_string *src;
dom_exception err;
if (box->style && ns_computed_display(box->style,
box_is_root(n)) == CSS_DISPLAY_NONE)
return true;
params = talloc(content->bctx, struct object_params);
if (params == NULL)
return false;
talloc_set_destructor(params, box_object_talloc_destructor);
params->data = NULL;
params->type = NULL;
params->codetype = NULL;
params->codebase = NULL;
params->classid = NULL;
params->params = NULL;
/* src is a URL */
err = dom_element_get_attribute(n, corestring_dom_src, &src);
if (err != DOM_NO_ERR || src == NULL)
return true;
if (box_extract_link(content, src, content->base_url,
&params->data) == false) {
dom_string_unref(src);
return false;
}
dom_string_unref(src);
if (params->data == NULL)
return true;
/* Don't include ourself */
if (nsurl_compare(content->base_url, params->data, NSURL_COMPLETE))
return true;
/* add attributes as parameters to linked list */
err = dom_node_get_attributes(n, &attrs);
if (err != DOM_NO_ERR)
return false;
err = dom_namednodemap_get_length(attrs, &num_attrs);
if (err != DOM_NO_ERR) {
dom_namednodemap_unref(attrs);
return false;
}
for (idx = 0; idx < num_attrs; idx++) {
dom_attr *attr;
dom_string *name, *value;
err = dom_namednodemap_item(attrs, idx, (void *) &attr);
if (err != DOM_NO_ERR) {
dom_namednodemap_unref(attrs);
return false;
}
err = dom_attr_get_name(attr, &name);
if (err != DOM_NO_ERR) {
dom_node_unref(attr);
dom_namednodemap_unref(attrs);
return false;
}
if (dom_string_caseless_lwc_isequal(name, corestring_lwc_src)) {
dom_node_unref(attr);
dom_string_unref(name);
continue;
}
err = dom_attr_get_value(attr, &value);
if (err != DOM_NO_ERR) {
dom_node_unref(attr);
dom_string_unref(name);
dom_namednodemap_unref(attrs);
return false;
}
param = talloc(content->bctx, struct object_param);
if (param == NULL) {
dom_node_unref(attr);
dom_string_unref(value);
dom_string_unref(name);
dom_namednodemap_unref(attrs);
return false;
}
param->name = talloc_strdup(content->bctx, dom_string_data(name));
param->value = talloc_strdup(content->bctx, dom_string_data(value));
param->type = NULL;
param->valuetype = talloc_strdup(content->bctx, "data");
param->next = NULL;
dom_string_unref(value);
dom_string_unref(name);
dom_node_unref(attr);
if (param->name == NULL || param->value == NULL ||
param->valuetype == NULL) {
dom_namednodemap_unref(attrs);
return false;
}
param->next = params->params;
params->params = param;
}
dom_namednodemap_unref(attrs);
box->object_params = params;
/* start fetch */
box->flags |= IS_REPLACED;
return html_fetch_object(content, params->data, box, CONTENT_ANY, false);
}
/**
* Window subdivision [16.2.1].
*/
static bool
box_frameset(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
bool ok;
if (content->frameset) {
NSLOG(netsurf, INFO, "Error: multiple framesets in document.");
/* Don't convert children */
if (convert_children)
*convert_children = false;
/* And ignore this spurious frameset */
box->type = BOX_NONE;
return true;
}
content->frameset = talloc_zero(content->bctx,
struct content_html_frames);
if (!content->frameset) {
return false;
}
ok = box_create_frameset(content->frameset, n, content);
if (ok) {
box->type = BOX_NONE;
}
if (convert_children) {
*convert_children = false;
}
return ok;
}
/**
* Inline subwindow [16.5].
*/
static bool
box_iframe(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
nsurl *url;
dom_string *s;
dom_exception err;
struct content_html_iframe *iframe;
int i;
if (box->style && ns_computed_display(box->style,
box_is_root(n)) == CSS_DISPLAY_NONE)
return true;
if (box->style &&
css_computed_visibility(box->style) == CSS_VISIBILITY_HIDDEN) {
/* Don't create iframe discriptors for invisible iframes
* TODO: handle hidden iframes at browser_window generation
* time instead? */
return true;
}
/* get frame URL */
err = dom_element_get_attribute(n, corestring_dom_src, &s);
if (err != DOM_NO_ERR || s == NULL)
return true;
if (box_extract_link(content, s, content->base_url, &url) == false) {
dom_string_unref(s);
return false;
}
dom_string_unref(s);
if (url == NULL)
return true;
/* don't include ourself */
if (nsurl_compare(content->base_url, url, NSURL_COMPLETE)) {
nsurl_unref(url);
return true;
}
/* create a new iframe */
iframe = talloc(content->bctx, struct content_html_iframe);
if (iframe == NULL) {
nsurl_unref(url);
return false;
}
talloc_set_destructor(iframe, box_iframes_talloc_destructor);
iframe->box = box;
iframe->margin_width = 0;
iframe->margin_height = 0;
iframe->name = NULL;
iframe->url = url;
iframe->scrolling = BW_SCROLLING_AUTO;
iframe->border = true;
/* Add this iframe to the linked list of iframes */
iframe->next = content->iframe;
content->iframe = iframe;
/* fill in specified values */
err = dom_element_get_attribute(n, corestring_dom_name, &s);
if (err == DOM_NO_ERR && s != NULL) {
iframe->name = talloc_strdup(content->bctx, dom_string_data(s));
dom_string_unref(s);
}
err = dom_element_get_attribute(n, corestring_dom_frameborder, &s);
if (err == DOM_NO_ERR && s != NULL) {
i = atoi(dom_string_data(s));
iframe->border = (i != 0);
dom_string_unref(s);
}
err = dom_element_get_attribute(n, corestring_dom_bordercolor, &s);
if (err == DOM_NO_ERR && s != NULL) {
css_color color;
if (nscss_parse_colour(dom_string_data(s), &color))
iframe->border_colour = nscss_color_to_ns(color);
dom_string_unref(s);
}
err = dom_element_get_attribute(n, corestring_dom_scrolling, &s);
if (err == DOM_NO_ERR && s != NULL) {
if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_yes))
iframe->scrolling = BW_SCROLLING_YES;
else if (dom_string_caseless_lwc_isequal(s,
corestring_lwc_no))
iframe->scrolling = BW_SCROLLING_NO;
dom_string_unref(s);
}
err = dom_element_get_attribute(n, corestring_dom_marginwidth, &s);
if (err == DOM_NO_ERR && s != NULL) {
iframe->margin_width = atoi(dom_string_data(s));
dom_string_unref(s);
}
err = dom_element_get_attribute(n, corestring_dom_marginheight, &s);
if (err == DOM_NO_ERR && s != NULL) {
iframe->margin_height = atoi(dom_string_data(s));
dom_string_unref(s);
}
/* box */
assert(box->style);
box->flags |= IFRAME;
box->flags |= IS_REPLACED;
/* Showing iframe, so don't show alternate content */
if (convert_children)
*convert_children = false;
return true;
}
/**
* Embedded image [13.2].
*/
static bool
box_image(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
bool ok;
dom_string *s;
dom_exception err;
nsurl *url;
enum css_width_e wtype;
enum css_height_e htype;
css_fixed value = 0;
css_unit wunit = CSS_UNIT_PX;
css_unit hunit = CSS_UNIT_PX;
if (box->style && ns_computed_display(box->style,
box_is_root(n)) == CSS_DISPLAY_NONE)
return true;
/* handle alt text */
err = dom_element_get_attribute(n, corestring_dom_alt, &s);
if (err == DOM_NO_ERR && s != NULL) {
char *alt = squash_whitespace(dom_string_data(s));
dom_string_unref(s);
if (alt == NULL)
return false;
box->text = talloc_strdup(content->bctx, alt);
free(alt);
if (box->text == NULL)
return false;
box->length = strlen(box->text);
}
if (nsoption_bool(foreground_images) == false) {
return true;
}
/* imagemap associated with this image */
if (!box_get_attribute(n, "usemap", content->bctx, &box->usemap))
return false;
if (box->usemap && box->usemap[0] == '#')
box->usemap++;
/* get image URL */
err = dom_element_get_attribute(n, corestring_dom_src, &s);
if (err != DOM_NO_ERR || s == NULL)
return true;
if (box_extract_link(content, s, content->base_url, &url) == false) {
dom_string_unref(s);
return false;
}
dom_string_unref(s);
if (url == NULL)
return true;
/* start fetch */
box->flags |= IS_REPLACED;
ok = html_fetch_object(content, url, box, image_types, false);
nsurl_unref(url);
wtype = css_computed_width(box->style, &value, &wunit);
htype = css_computed_height(box->style, &value, &hunit);
if (wtype == CSS_WIDTH_SET &&
wunit != CSS_UNIT_PCT &&
htype == CSS_HEIGHT_SET &&
hunit != CSS_UNIT_PCT) {
/* We know the dimensions the image will be shown at
* before it's fetched. */
box->flags |= REPLACE_DIM;
}
return ok;
}
/**
* Form control [17.4].
*/
static bool
box_input(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
struct form_control *gadget;
dom_string *type = NULL;
dom_exception err;
nsurl *url;
nserror error;
gadget = html_forms_get_control_for_node(content->forms, n);
if (gadget == NULL) {
return false;
}
box->gadget = gadget;
box->flags |= IS_REPLACED;
gadget->box = box;
gadget->html = content;
/* get entry type */
err = dom_element_get_attribute(n, corestring_dom_type, &type);
if ((err != DOM_NO_ERR) || (type == NULL)) {
/* no type so "text" is assumed */
if (box_input_text(content, box, n) == false) {
return false;
}
*convert_children = false;
return true;
}
if (dom_string_caseless_lwc_isequal(type, corestring_lwc_password)) {
if (box_input_text(content, box, n) == false)
goto no_memory;
} else if (dom_string_caseless_lwc_isequal(type, corestring_lwc_file)) {
box->type = BOX_INLINE_BLOCK;
} else if (dom_string_caseless_lwc_isequal(type,
corestring_lwc_hidden)) {
/* no box for hidden inputs */
box->type = BOX_NONE;
} else if ((dom_string_caseless_lwc_isequal(type,
corestring_lwc_checkbox) ||
dom_string_caseless_lwc_isequal(type,
corestring_lwc_radio))) {
} else if (dom_string_caseless_lwc_isequal(type,
corestring_lwc_submit) ||
dom_string_caseless_lwc_isequal(type,
corestring_lwc_reset) ||
dom_string_caseless_lwc_isequal(type,
corestring_lwc_button)) {
struct box *inline_container, *inline_box;
if (box_button(n, content, box, 0) == false)
goto no_memory;
inline_container = box_create(NULL, 0, false, 0, 0, 0, 0,
content->bctx);
if (inline_container == NULL)
goto no_memory;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(NULL, box->style, false, 0, 0,
box->title, 0, content->bctx);
if (inline_box == NULL)
goto no_memory;
inline_box->type = BOX_TEXT;
if (box->gadget->value != NULL)
inline_box->text = talloc_strdup(content->bctx,
box->gadget->value);
else if (box->gadget->type == GADGET_SUBMIT)
inline_box->text = talloc_strdup(content->bctx,
messages_get("Form_Submit"));
else if (box->gadget->type == GADGET_RESET)
inline_box->text = talloc_strdup(content->bctx,
messages_get("Form_Reset"));
else
inline_box->text = talloc_strdup(content->bctx,
"Button");
if (inline_box->text == NULL)
goto no_memory;
inline_box->length = strlen(inline_box->text);
box_add_child(inline_container, inline_box);
box_add_child(box, inline_container);
} else if (dom_string_caseless_lwc_isequal(type,
corestring_lwc_image)) {
gadget->type = GADGET_IMAGE;
if (box->style && ns_computed_display(box->style,
box_is_root(n)) != CSS_DISPLAY_NONE &&
nsoption_bool(foreground_images) == true) {
dom_string *s;
err = dom_element_get_attribute(n, corestring_dom_src, &s);
if (err == DOM_NO_ERR && s != NULL) {
error = nsurl_join(content->base_url,
dom_string_data(s), &url);
dom_string_unref(s);
if (error != NSERROR_OK)
goto no_memory;
/* if url is equivalent to the parent's url,
* we've got infinite inclusion. stop it here
*/
if (nsurl_compare(url, content->base_url,
NSURL_COMPLETE) == false) {
if (!html_fetch_object(content,
url,
box,
image_types,
false)) {
nsurl_unref(url);
goto no_memory;
}
}
nsurl_unref(url);
}
}
} else {
/* unhandled type the default is "text" */
if (box_input_text(content, box, n) == false)
goto no_memory;
}
dom_string_unref(type);
*convert_children = false;
return true;
no_memory:
dom_string_unref(type);
return false;
}
/**
* Noscript element
*/
static bool
box_noscript(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
/* If scripting is enabled, do not display the contents of noscript */
if (content->enable_scripting) {
*convert_children = false;
}
return true;
}
/**
* Generic embedded object [13.3].
*/
static bool
box_object(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
struct object_params *params;
struct object_param *param;
dom_string *codebase, *classid, *data;
dom_node *c;
dom_exception err;
if (box->style && ns_computed_display(box->style,
box_is_root(n)) == CSS_DISPLAY_NONE)
return true;
if (box_get_attribute(n, "usemap", content->bctx, &box->usemap) ==
false)
return false;
if (box->usemap && box->usemap[0] == '#')
box->usemap++;
params = talloc(content->bctx, struct object_params);
if (params == NULL)
return false;
talloc_set_destructor(params, box_object_talloc_destructor);
params->data = NULL;
params->type = NULL;
params->codetype = NULL;
params->codebase = NULL;
params->classid = NULL;
params->params = NULL;
/* codebase, classid, and data are URLs
* (codebase is the base for the other two) */
err = dom_element_get_attribute(n, corestring_dom_codebase, &codebase);
if (err == DOM_NO_ERR && codebase != NULL) {
if (box_extract_link(content, codebase, content->base_url,
&params->codebase) == false) {
dom_string_unref(codebase);
return false;
}
dom_string_unref(codebase);
}
if (params->codebase == NULL)
params->codebase = nsurl_ref(content->base_url);
err = dom_element_get_attribute(n, corestring_dom_classid, &classid);
if (err == DOM_NO_ERR && classid != NULL) {
if (box_extract_link(content, classid,
params->codebase, &params->classid) == false) {
dom_string_unref(classid);
return false;
}
dom_string_unref(classid);
}
err = dom_element_get_attribute(n, corestring_dom_data, &data);
if (err == DOM_NO_ERR && data != NULL) {
if (box_extract_link(content, data,
params->codebase, &params->data) == false) {
dom_string_unref(data);
return false;
}
dom_string_unref(data);
}
if (params->classid == NULL && params->data == NULL)
/* nothing to embed; ignore */
return true;
/* Don't include ourself */
if (params->classid != NULL && nsurl_compare(content->base_url,
params->classid, NSURL_COMPLETE))
return true;
if (params->data != NULL && nsurl_compare(content->base_url,
params->data, NSURL_COMPLETE))
return true;
/* codetype and type are MIME types */
if (box_get_attribute(n, "codetype", params,
&params->codetype) == false)
return false;
if (box_get_attribute(n, "type", params, &params->type) == false)
return false;
/* classid && !data => classid is used (consult codetype)
* (classid || !classid) && data => data is used (consult type)
* !classid && !data => invalid; ignored */
if (params->classid != NULL && params->data == NULL &&
params->codetype != NULL) {
lwc_string *icodetype;
lwc_error lerror;
lerror = lwc_intern_string(params->codetype,
strlen(params->codetype), &icodetype);
if (lerror != lwc_error_ok)
return false;
if (content_factory_type_from_mime_type(icodetype) ==
CONTENT_NONE) {
/* can't handle this MIME type */
lwc_string_unref(icodetype);
return true;
}
lwc_string_unref(icodetype);
}
if (params->data != NULL && params->type != NULL) {
lwc_string *itype;
lwc_error lerror;
lerror = lwc_intern_string(params->type, strlen(params->type),
&itype);
if (lerror != lwc_error_ok)
return false;
if (content_factory_type_from_mime_type(itype) ==
CONTENT_NONE) {
/* can't handle this MIME type */
lwc_string_unref(itype);
return true;
}
lwc_string_unref(itype);
}
/* add parameters to linked list */
err = dom_node_get_first_child(n, &c);
if (err != DOM_NO_ERR)
return false;
while (c != NULL) {
dom_node *next;
dom_node_type type;
err = dom_node_get_node_type(c, &type);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
if (type == DOM_ELEMENT_NODE) {
dom_string *name;
err = dom_node_get_node_name(c, &name);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
if (!dom_string_caseless_lwc_isequal(name,
corestring_lwc_param)) {
/* The first non-param child is the start of
* the alt html. Therefore, we should break
* out of this loop. */
dom_string_unref(name);
dom_node_unref(c);
break;
}
dom_string_unref(name);
param = talloc(params, struct object_param);
if (param == NULL) {
dom_node_unref(c);
return false;
}
param->name = NULL;
param->value = NULL;
param->type = NULL;
param->valuetype = NULL;
param->next = NULL;
if (box_get_attribute(c, "name", param,
&param->name) == false) {
dom_node_unref(c);
return false;
}
if (box_get_attribute(c, "value", param,
&param->value) == false) {
dom_node_unref(c);
return false;
}
if (box_get_attribute(c, "type", param,
&param->type) == false) {
dom_node_unref(c);
return false;
}
if (box_get_attribute(c, "valuetype", param,
&param->valuetype) == false) {
dom_node_unref(c);
return false;
}
if (param->valuetype == NULL) {
param->valuetype = talloc_strdup(param, "data");
if (param->valuetype == NULL) {
dom_node_unref(c);
return false;
}
}
param->next = params->params;
params->params = param;
}
err = dom_node_get_next_sibling(c, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
return false;
}
dom_node_unref(c);
c = next;
}
box->object_params = params;
/* start fetch (MIME type is ok or not specified) */
box->flags |= IS_REPLACED;
if (!html_fetch_object(content,
params->data ? params->data : params->classid,
box,
CONTENT_ANY,
false))
return false;
*convert_children = false;
return true;
}
/**
* Preformatted text [9.3.4].
*/
static bool
box_pre(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
box->flags |= PRE_STRIP;
return true;
}
/**
* Option selector [17.6].
*/
static bool
box_select(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
struct box *inline_container;
struct box *inline_box;
struct form_control *gadget;
dom_node *c, *c2;
dom_node *next, *next2;
dom_exception err;
gadget = html_forms_get_control_for_node(content->forms, n);
if (gadget == NULL)
return false;
gadget->html = content;
err = dom_node_get_first_child(n, &c);
if (err != DOM_NO_ERR) {
form_free_control(gadget);
return false;
}
while (c != NULL) {
dom_string *name;
err = dom_node_get_node_name(c, &name);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
form_free_control(gadget);
return false;
}
if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_option)) {
dom_string_unref(name);
if (box_select_add_option(gadget, c) == false) {
dom_node_unref(c);
form_free_control(gadget);
return false;
}
} else if (dom_string_caseless_lwc_isequal(name,
corestring_lwc_optgroup)) {
dom_string_unref(name);
err = dom_node_get_first_child(c, &c2);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
form_free_control(gadget);
return false;
}
while (c2 != NULL) {
dom_string *c2_name;
err = dom_node_get_node_name(c2, &c2_name);
if (err != DOM_NO_ERR) {
dom_node_unref(c2);
dom_node_unref(c);
form_free_control(gadget);
return false;
}
if (dom_string_caseless_lwc_isequal(c2_name,
corestring_lwc_option)) {
dom_string_unref(c2_name);
if (box_select_add_option(gadget,
c2) == false) {
dom_node_unref(c2);
dom_node_unref(c);
form_free_control(gadget);
return false;
}
} else {
dom_string_unref(c2_name);
}
err = dom_node_get_next_sibling(c2, &next2);
if (err != DOM_NO_ERR) {
dom_node_unref(c2);
dom_node_unref(c);
form_free_control(gadget);
return false;
}
dom_node_unref(c2);
c2 = next2;
}
} else {
dom_string_unref(name);
}
err = dom_node_get_next_sibling(c, &next);
if (err != DOM_NO_ERR) {
dom_node_unref(c);
form_free_control(gadget);
return false;
}
dom_node_unref(c);
c = next;
}
if (gadget->data.select.num_items == 0) {
/* no options: ignore entire select */
form_free_control(gadget);
return true;
}
box->type = BOX_INLINE_BLOCK;
box->gadget = gadget;
box->flags |= IS_REPLACED;
gadget->box = box;
inline_container = box_create(NULL, 0, false, 0, 0, 0, 0, content->bctx);
if (inline_container == NULL)
goto no_memory;
inline_container->type = BOX_INLINE_CONTAINER;
inline_box = box_create(NULL, box->style, false, 0, 0, box->title, 0,
content->bctx);
if (inline_box == NULL)
goto no_memory;
inline_box->type = BOX_TEXT;
box_add_child(inline_container, inline_box);
box_add_child(box, inline_container);
if (gadget->data.select.multiple == false &&
gadget->data.select.num_selected == 0) {
gadget->data.select.current = gadget->data.select.items;
gadget->data.select.current->initial_selected =
gadget->data.select.current->selected = true;
gadget->data.select.num_selected = 1;
dom_html_option_element_set_selected(
gadget->data.select.current->node, true);
}
if (gadget->data.select.num_selected == 0)
inline_box->text = talloc_strdup(content->bctx,
messages_get("Form_None"));
else if (gadget->data.select.num_selected == 1)
inline_box->text = talloc_strdup(content->bctx,
gadget->data.select.current->text);
else
inline_box->text = talloc_strdup(content->bctx,
messages_get("Form_Many"));
if (inline_box->text == NULL)
goto no_memory;
inline_box->length = strlen(inline_box->text);
*convert_children = false;
return true;
no_memory:
return false;
}
/**
* Multi-line text field [17.7].
*/
static bool box_textarea(dom_node *n,
html_content *content,
struct box *box,
bool *convert_children)
{
/* Get the form_control for the DOM node */
box->gadget = html_forms_get_control_for_node(content->forms, n);
if (box->gadget == NULL)
return false;
box->flags |= IS_REPLACED;
box->gadget->html = content;
box->gadget->box = box;
if (!box_input_text(content, box, n))
return false;
*convert_children = false;
return true;
}
/**
* \}
*/
/* exported interface documented in html/box_special.h */
bool
convert_special_elements(dom_node *node,
html_content *content,
struct box *box,
bool *convert_children)
{
dom_exception exc;
dom_html_element_type tag_type;
bool res;
exc = dom_html_element_get_tag_type(node, &tag_type);
if (exc != DOM_NO_ERR) {
tag_type = DOM_HTML_ELEMENT_TYPE__UNKNOWN;
}
switch (tag_type) {
case DOM_HTML_ELEMENT_TYPE_A:
res = box_a(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_BODY:
res = box_body(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_BR:
res = box_br(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_BUTTON:
res = box_button(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_CANVAS:
res = box_canvas(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_EMBED:
res = box_embed(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_FRAMESET:
res = box_frameset(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_IFRAME:
res = box_iframe(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_IMG:
res = box_image(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_INPUT:
res = box_input(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_NOSCRIPT:
res = box_noscript(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_OBJECT:
res = box_object(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_PRE:
res = box_pre(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_SELECT:
res = box_select(node, content, box, convert_children);
break;
case DOM_HTML_ELEMENT_TYPE_TEXTAREA:
res = box_textarea(node, content, box, convert_children);
break;
default:
res = true;
}
return res;
}
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