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split dom event handling into separate module

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This commit is contained in:
Vincent Sanders 2020-05-05 20:05:37 +01:00
parent 1d8542166c
commit d9a593c984
4 changed files with 837 additions and 727 deletions
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1
content/handlers/html/Makefile
View File

@ -8,6 +8,7 @@ S_HTML := box_construct.c \
box_textarea.c \
css.c \
css_fetcher.c \
dom_event.c \
font.c \
form.c \
forms.c \

790
content/handlers/html/dom_event.c Normal file
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@ -0,0 +1,790 @@
/*
* Copyright 2010 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 HTML content DOM event handling.
*/
#include "utils/corestrings.h"
#include "utils/nsoption.h"
#include "utils/log.h"
#include "utils/ascii.h"
#include "utils/string.h"
#include "javascript/js.h"
#include "html/private.h"
#include "html/object.h"
#include "html/css.h"
#include "html/box.h"
#include "html/box_construct.h"
#include "html/form_internal.h"
#include "html/dom_event.h"
/**
* process a base element being inserted into the DOM
*
* \param htmlc The html content containing the DOM
* \param node The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static bool html_process_inserted_base(html_content *htmlc, dom_node *node)
{
dom_exception exc; /* returned by libdom functions */
dom_string *atr_string;
/* get href attribute if present */
exc = dom_element_get_attribute(node, corestring_dom_href, &atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
nsurl *url;
nserror error;
/* get url from string */
error = nsurl_create(dom_string_data(atr_string), &url);
dom_string_unref(atr_string);
if (error == NSERROR_OK) {
if (htmlc->base_url != NULL) {
nsurl_unref(htmlc->base_url);
}
htmlc->base_url = url;
}
}
/* get target attribute if present and not already set */
if (htmlc->base_target != NULL) {
return true;
}
exc = dom_element_get_attribute(node,
corestring_dom_target,
&atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
/* Validation rules from the HTML5 spec for the base element:
* The target must be one of _blank, _self, _parent, or
* _top or any identifier which does not begin with an
* underscore
*/
if (*dom_string_data(atr_string) != '_' ||
dom_string_caseless_lwc_isequal(atr_string,
corestring_lwc__blank) ||
dom_string_caseless_lwc_isequal(atr_string,
corestring_lwc__self) ||
dom_string_caseless_lwc_isequal(atr_string,
corestring_lwc__parent) ||
dom_string_caseless_lwc_isequal(atr_string,
corestring_lwc__top)) {
htmlc->base_target = strdup(dom_string_data(atr_string));
}
dom_string_unref(atr_string);
}
return true;
}
/**
* process a canvas element being inserted into the DOM
*
* \param htmlc The html content containing the DOM
* \param node The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static nserror html_process_inserted_canvas(html_content *htmlc, dom_node *node)
{
return NSERROR_OK;
}
/**
* Process img element being inserted into the DOM.
*
* \param htmlc The html content containing the DOM
* \param node The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static bool html_process_inserted_img(html_content *htmlc, dom_node *node)
{
dom_string *src;
nsurl *url;
nserror err;
dom_exception exc;
bool success;
/* Do nothing if foreground images are disabled */
if (nsoption_bool(foreground_images) == false) {
return true;
}
exc = dom_element_get_attribute(node, corestring_dom_src, &src);
if (exc != DOM_NO_ERR || src == NULL) {
return true;
}
err = nsurl_join(htmlc->base_url, dom_string_data(src), &url);
if (err != NSERROR_OK) {
dom_string_unref(src);
return false;
}
dom_string_unref(src);
/* Speculatively fetch the image */
success = html_fetch_object(htmlc, url, NULL, CONTENT_IMAGE, false);
nsurl_unref(url);
return success;
}
/**
* process a LINK element being inserted into the DOM
*
* \note only the http-equiv attribute for refresh is currently considered
*
* \param htmlc The html content containing the DOM
* \param n The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static bool html_process_inserted_link(html_content *c, dom_node *node)
{
struct content_rfc5988_link link; /* the link added to the content */
dom_exception exc; /* returned by libdom functions */
dom_string *atr_string;
nserror error;
/* Handle stylesheet loading */
html_css_process_link(c, (dom_node *)node);
/* try Generic link handling */
memset(&link, 0, sizeof(struct content_rfc5988_link));
/* check that the relation exists - w3c spec says must be present */
exc = dom_element_get_attribute(node, corestring_dom_rel, &atr_string);
if ((exc != DOM_NO_ERR) || (atr_string == NULL)) {
return false;
}
/* get a lwc string containing the link relation */
exc = dom_string_intern(atr_string, &link.rel);
dom_string_unref(atr_string);
if (exc != DOM_NO_ERR) {
return false;
}
/* check that the href exists - w3c spec says must be present */
exc = dom_element_get_attribute(node, corestring_dom_href, &atr_string);
if ((exc != DOM_NO_ERR) || (atr_string == NULL)) {
lwc_string_unref(link.rel);
return false;
}
/* get nsurl */
error = nsurl_join(c->base_url, dom_string_data(atr_string),
&link.href);
dom_string_unref(atr_string);
if (error != NSERROR_OK) {
lwc_string_unref(link.rel);
return false;
}
/* look for optional properties -- we don't care if internment fails */
exc = dom_element_get_attribute(node,
corestring_dom_hreflang, &atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
/* get a lwc string containing the href lang */
(void)dom_string_intern(atr_string, &link.hreflang);
dom_string_unref(atr_string);
}
exc = dom_element_get_attribute(node,
corestring_dom_type, &atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
/* get a lwc string containing the type */
(void)dom_string_intern(atr_string, &link.type);
dom_string_unref(atr_string);
}
exc = dom_element_get_attribute(node,
corestring_dom_media, &atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
/* get a lwc string containing the media */
(void)dom_string_intern(atr_string, &link.media);
dom_string_unref(atr_string);
}
exc = dom_element_get_attribute(node,
corestring_dom_sizes, &atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
/* get a lwc string containing the sizes */
(void)dom_string_intern(atr_string, &link.sizes);
dom_string_unref(atr_string);
}
/* add to content */
content__add_rfc5988_link(&c->base, &link);
if (link.sizes != NULL)
lwc_string_unref(link.sizes);
if (link.media != NULL)
lwc_string_unref(link.media);
if (link.type != NULL)
lwc_string_unref(link.type);
if (link.hreflang != NULL)
lwc_string_unref(link.hreflang);
nsurl_unref(link.href);
lwc_string_unref(link.rel);
return true;
}
/* handler for a SCRIPT which has been added to a tree */
static void
dom_SCRIPT_showed_up(html_content *htmlc, dom_html_script_element *script)
{
dom_exception exc;
dom_html_script_element_flags flags;
dom_hubbub_error res;
bool within;
if (!htmlc->enable_scripting) {
NSLOG(netsurf, INFO, "Encountered a script, but scripting is off, ignoring");
return;
}
NSLOG(netsurf, DEEPDEBUG, "Encountered a script, node %p showed up", script);
exc = dom_html_script_element_get_flags(script, &flags);
if (exc != DOM_NO_ERR) {
NSLOG(netsurf, DEEPDEBUG, "Unable to retrieve flags, giving up");
return;
}
if (flags & DOM_HTML_SCRIPT_ELEMENT_FLAG_PARSER_INSERTED) {
NSLOG(netsurf, DEBUG, "Script was parser inserted, skipping");
return;
}
exc = dom_node_contains(htmlc->document, script, &within);
if (exc != DOM_NO_ERR) {
NSLOG(netsurf, DEBUG, "Unable to determine if script was within document, ignoring");
return;
}
if (!within) {
NSLOG(netsurf, DEBUG, "Script was not within the document, ignoring for now");
return;
}
res = html_process_script(htmlc, (dom_node *) script);
if (res == DOM_HUBBUB_OK) {
NSLOG(netsurf, DEEPDEBUG, "Inserted script has finished running");
} else {
if (res == (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_PAUSED)) {
NSLOG(netsurf, DEEPDEBUG, "Inserted script has launced asynchronously");
} else {
NSLOG(netsurf, DEEPDEBUG, "Failure starting script");
}
}
}
/**
* process a META element being inserted into the DOM
*
* \note only the http-equiv attribute for refresh is currently considered
*
* \param htmlc The html content containing the DOM
* \param n The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static nserror html_process_inserted_meta(html_content *c, dom_node *n)
{
union content_msg_data msg_data;
const char *url, *end, *refresh = NULL;
char *new_url;
char quote = '\0';
dom_string *equiv, *content;
dom_exception exc;
nsurl *nsurl;
nserror error = NSERROR_OK;
if (c->refresh) {
/* refresh already delt with */
return NSERROR_OK;
}
exc = dom_element_get_attribute(n, corestring_dom_http_equiv, &equiv);
if (exc != DOM_NO_ERR) {
return NSERROR_DOM;
}
if (equiv == NULL) {
return NSERROR_OK;
}
if (!dom_string_caseless_lwc_isequal(equiv, corestring_lwc_refresh)) {
dom_string_unref(equiv);
return NSERROR_OK;
}
dom_string_unref(equiv);
exc = dom_element_get_attribute(n, corestring_dom_content, &content);
if (exc != DOM_NO_ERR) {
return NSERROR_DOM;
}
if (content == NULL) {
return NSERROR_OK;
}
end = dom_string_data(content) + dom_string_byte_length(content);
/* content := *LWS intpart fracpart? *LWS [';' *LWS *1url *LWS]
* intpart := 1*DIGIT
* fracpart := 1*('.' | DIGIT)
* url := "url" *LWS '=' *LWS (url-nq | url-sq | url-dq)
* url-nq := *urlchar
* url-sq := "'" *(urlchar | '"') "'"
* url-dq := '"' *(urlchar | "'") '"'
* urlchar := [#x9#x21#x23-#x26#x28-#x7E] | nonascii
* nonascii := [#x80-#xD7FF#xE000-#xFFFD#x10000-#x10FFFF]
*/
url = dom_string_data(content);
/* *LWS */
while (url < end && ascii_is_space(*url)) {
url++;
}
/* intpart */
if (url == end || (*url < '0' || '9' < *url)) {
/* Empty content, or invalid timeval */
dom_string_unref(content);
return NSERROR_OK;
}
msg_data.delay = (int) strtol(url, &new_url, 10);
/* a very small delay and self-referencing URL can cause a loop
* that grinds machines to a halt. To prevent this we set a
* minimum refresh delay of 1s. */
if (msg_data.delay < 1) {
msg_data.delay = 1;
}
url = new_url;
/* fracpart? (ignored, as delay is integer only) */
while (url < end && (('0' <= *url && *url <= '9') ||
*url == '.')) {
url++;
}
/* *LWS */
while (url < end && ascii_is_space(*url)) {
url++;
}
/* ';' */
if (url < end && *url == ';')
url++;
/* *LWS */
while (url < end && ascii_is_space(*url)) {
url++;
}
if (url == end) {
/* Just delay specified, so refresh current page */
dom_string_unref(content);
c->base.refresh = nsurl_ref(content_get_url(&c->base));
content_broadcast(&c->base, CONTENT_MSG_REFRESH, &msg_data);
return NSERROR_OK;
}
/* "url" */
if (url <= end - 3) {
if (strncasecmp(url, "url", 3) == 0) {
url += 3;
} else {
/* Unexpected input, ignore this header */
dom_string_unref(content);
return NSERROR_OK;
}
} else {
/* Insufficient input, ignore this header */
dom_string_unref(content);
return NSERROR_OK;
}
/* *LWS */
while (url < end && ascii_is_space(*url)) {
url++;
}
/* '=' */
if (url < end) {
if (*url == '=') {
url++;
} else {
/* Unexpected input, ignore this header */
dom_string_unref(content);
return NSERROR_OK;
}
} else {
/* Insufficient input, ignore this header */
dom_string_unref(content);
return NSERROR_OK;
}
/* *LWS */
while (url < end && ascii_is_space(*url)) {
url++;
}
/* '"' or "'" */
if (url < end && (*url == '"' || *url == '\'')) {
quote = *url;
url++;
}
/* Start of URL */
refresh = url;
if (quote != 0) {
/* url-sq | url-dq */
while (url < end && *url != quote)
url++;
} else {
/* url-nq */
while (url < end && !ascii_is_space(*url))
url++;
}
/* '"' or "'" or *LWS (we don't care) */
if (url > refresh) {
/* There's a URL */
new_url = strndup(refresh, url - refresh);
if (new_url == NULL) {
dom_string_unref(content);
return NSERROR_NOMEM;
}
error = nsurl_join(c->base_url, new_url, &nsurl);
if (error == NSERROR_OK) {
/* broadcast valid refresh url */
c->base.refresh = nsurl;
content_broadcast(&c->base,
CONTENT_MSG_REFRESH,
&msg_data);
c->refresh = true;
}
free(new_url);
}
dom_string_unref(content);
return error;
}
/**
* Process title element being inserted into the DOM.
*
* https://html.spec.whatwg.org/multipage/semantics.html#the-title-element
*
* \param htmlc The html content containing the DOM
* \param node The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static nserror html_process_inserted_title(html_content *htmlc, dom_node *node)
{
if (htmlc->title == NULL) {
/* only the first title is considered */
htmlc->title = dom_node_ref(node);
}
return NSERROR_OK;
}
/** process title node */
static bool html_process_title(html_content *c, dom_node *node)
{
dom_exception exc; /* returned by libdom functions */
dom_string *title;
char *title_str;
bool success;
exc = dom_node_get_text_content(node, &title);
if ((exc != DOM_NO_ERR) || (title == NULL)) {
return false;
}
title_str = squash_whitespace(dom_string_data(title));
dom_string_unref(title);
if (title_str == NULL) {
return false;
}
success = content__set_title(&c->base, title_str);
free(title_str);
return success;
}
/**
* Deal with input elements being modified by resyncing their gadget
* if they have one.
*/
static void html_texty_element_update(html_content *htmlc, dom_node *node)
{
struct box *box = box_for_node(node);
if (box == NULL) {
return; /* No Box (yet?) so no gadget to update */
}
if (box->gadget == NULL) {
return; /* No gadget yet (under construction perhaps?) */
}
form_gadget_sync_with_dom(box->gadget);
/* And schedule a redraw for the box */
html__redraw_a_box(htmlc, box);
}
/**
* callback for DOMNodeInserted end type
*/
static void
dom_default_action_DOMNodeInserted_cb(struct dom_event *evt, void *pw)
{
dom_event_target *node;
dom_node_type type;
dom_exception exc;
html_content *htmlc = pw;
exc = dom_event_get_target(evt, &node);
if ((exc != DOM_NO_ERR) || (node == NULL)) {
/* failed to obtain the event target node */
return;
}
exc = dom_node_get_node_type(node, &type);
if ((exc == DOM_NO_ERR) && (type == DOM_ELEMENT_NODE)) {
/* an element node has been inserted */
dom_html_element_type tag_type;
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_BASE:
html_process_inserted_base(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_CANVAS:
html_process_inserted_canvas(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_IMG:
html_process_inserted_img(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_LINK:
html_process_inserted_link(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_META:
html_process_inserted_meta(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_STYLE:
html_css_process_style(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_SCRIPT:
dom_SCRIPT_showed_up(htmlc,
(dom_html_script_element *)node);
break;
case DOM_HTML_ELEMENT_TYPE_TITLE:
html_process_inserted_title(htmlc, (dom_node *)node);
break;
default:
break;
}
if (htmlc->enable_scripting) {
/* ensure javascript context is available */
if (htmlc->jsthread == NULL) {
union content_msg_data msg_data;
msg_data.jsthread = &htmlc->jsthread;
content_broadcast(&htmlc->base,
CONTENT_MSG_GETTHREAD,
&msg_data);
NSLOG(netsurf, INFO,
"javascript context: %p (htmlc: %p)",
htmlc->jsthread,
htmlc);
}
if (htmlc->jsthread != NULL) {
js_handle_new_element(htmlc->jsthread,
(dom_element *) node);
}
}
}
dom_node_unref(node);
}
/**
* callback for DOMNodeInsertedIntoDocument end type
*/
static void
dom_default_action_DOMNodeInsertedIntoDocument_cb(struct dom_event *evt,
void *pw)
{
html_content *htmlc = pw;
dom_event_target *node;
dom_node_type type;
dom_exception exc;
exc = dom_event_get_target(evt, &node);
if ((exc == DOM_NO_ERR) && (node != NULL)) {
exc = dom_node_get_node_type(node, &type);
if ((exc == DOM_NO_ERR) && (type == DOM_ELEMENT_NODE)) {
/* an element node has been modified */
dom_html_element_type tag_type;
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_SCRIPT:
dom_SCRIPT_showed_up(htmlc, (dom_html_script_element *) node);
default:
break;
}
}
dom_node_unref(node);
}
}
/**
* callback for DOMSubtreeModified end type
*/
static void
dom_default_action_DOMSubtreeModified_cb(struct dom_event *evt, void *pw)
{
dom_event_target *node;
dom_node_type type;
dom_exception exc;
html_content *htmlc = pw;
exc = dom_event_get_target(evt, &node);
if ((exc == DOM_NO_ERR) && (node != NULL)) {
if (htmlc->title == (dom_node *)node) {
/* Node is our title node */
html_process_title(htmlc, (dom_node *)node);
dom_node_unref(node);
return;
}
exc = dom_node_get_node_type(node, &type);
if ((exc == DOM_NO_ERR) && (type == DOM_ELEMENT_NODE)) {
/* an element node has been modified */
dom_html_element_type tag_type;
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_STYLE:
html_css_update_style(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_TEXTAREA:
case DOM_HTML_ELEMENT_TYPE_INPUT:
html_texty_element_update(htmlc, (dom_node *)node);
default:
break;
}
}
dom_node_unref(node);
}
}
/**
* callback for default action finished
*/
static void
dom_default_action_finished_cb(struct dom_event *evt, void *pw)
{
html_content *htmlc = pw;
if (htmlc->jsthread != NULL)
js_event_cleanup(htmlc->jsthread, evt);
}
/* exported interface documented in html/dom_event.c */
dom_default_action_callback
html_dom_event_fetcher(dom_string *type,
dom_default_action_phase phase,
void **pw)
{
NSLOG(netsurf, DEEPDEBUG,
"phase:%d type:%s", phase, dom_string_data(type));
if (phase == DOM_DEFAULT_ACTION_END) {
if (dom_string_isequal(type, corestring_dom_DOMNodeInserted)) {
return dom_default_action_DOMNodeInserted_cb;
} else if (dom_string_isequal(type, corestring_dom_DOMNodeInsertedIntoDocument)) {
return dom_default_action_DOMNodeInsertedIntoDocument_cb;
} else if (dom_string_isequal(type, corestring_dom_DOMSubtreeModified)) {
return dom_default_action_DOMSubtreeModified_cb;
}
} else if (phase == DOM_DEFAULT_ACTION_FINISHED) {
return dom_default_action_finished_cb;
}
return NULL;
}

43
content/handlers/html/dom_event.h Normal file
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@ -0,0 +1,43 @@
/*
* 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 content DOM event handling interface
*/
#ifndef NETSURF_HTML_DOM_EVENT_H
#define NETSURF_HTML_DOM_EVENT_H
/**
* html content DOM action callback function selector
*
* selects a callback function for libdom to call based on the type and phase.
* dom_default_action_phase from events/document_event.h
*
* The principle events are:
* DOMSubtreeModified
* DOMAttrModified
* DOMNodeInserted
* DOMNodeInsertedIntoDocument
*
* @return callback function pointer or NULL for none
*/
dom_default_action_callback html_dom_event_fetcher(dom_string *type, dom_default_action_phase phase, void **pw);
#endif

730
content/handlers/html/html.c
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@ -57,6 +57,7 @@
#include "html/html.h"
#include "html/private.h"
#include "html/dom_event.h"
#include "html/css.h"
#include "html/object.h"
#include "html/html_save.h"
@ -300,465 +301,6 @@ html_proceed_to_done(html_content *html)
}
/**
* process a LINK element being inserted into the DOM
*
* \note only the http-equiv attribute for refresh is currently considered
*
* \param htmlc The html content containing the DOM
* \param n The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static bool html_process_inserted_link(html_content *c, dom_node *node)
{
struct content_rfc5988_link link; /* the link added to the content */
dom_exception exc; /* returned by libdom functions */
dom_string *atr_string;
nserror error;
/* Handle stylesheet loading */
html_css_process_link(c, (dom_node *)node);
/* try Generic link handling */
memset(&link, 0, sizeof(struct content_rfc5988_link));
/* check that the relation exists - w3c spec says must be present */
exc = dom_element_get_attribute(node, corestring_dom_rel, &atr_string);
if ((exc != DOM_NO_ERR) || (atr_string == NULL)) {
return false;
}
/* get a lwc string containing the link relation */
exc = dom_string_intern(atr_string, &link.rel);
dom_string_unref(atr_string);
if (exc != DOM_NO_ERR) {
return false;
}
/* check that the href exists - w3c spec says must be present */
exc = dom_element_get_attribute(node, corestring_dom_href, &atr_string);
if ((exc != DOM_NO_ERR) || (atr_string == NULL)) {
lwc_string_unref(link.rel);
return false;
}
/* get nsurl */
error = nsurl_join(c->base_url, dom_string_data(atr_string),
&link.href);
dom_string_unref(atr_string);
if (error != NSERROR_OK) {
lwc_string_unref(link.rel);
return false;
}
/* look for optional properties -- we don't care if internment fails */
exc = dom_element_get_attribute(node,
corestring_dom_hreflang, &atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
/* get a lwc string containing the href lang */
(void)dom_string_intern(atr_string, &link.hreflang);
dom_string_unref(atr_string);
}
exc = dom_element_get_attribute(node,
corestring_dom_type, &atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
/* get a lwc string containing the type */
(void)dom_string_intern(atr_string, &link.type);
dom_string_unref(atr_string);
}
exc = dom_element_get_attribute(node,
corestring_dom_media, &atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
/* get a lwc string containing the media */
(void)dom_string_intern(atr_string, &link.media);
dom_string_unref(atr_string);
}
exc = dom_element_get_attribute(node,
corestring_dom_sizes, &atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
/* get a lwc string containing the sizes */
(void)dom_string_intern(atr_string, &link.sizes);
dom_string_unref(atr_string);
}
/* add to content */
content__add_rfc5988_link(&c->base, &link);
if (link.sizes != NULL)
lwc_string_unref(link.sizes);
if (link.media != NULL)
lwc_string_unref(link.media);
if (link.type != NULL)
lwc_string_unref(link.type);
if (link.hreflang != NULL)
lwc_string_unref(link.hreflang);
nsurl_unref(link.href);
lwc_string_unref(link.rel);
return true;
}
/** process title node */
static bool html_process_title(html_content *c, dom_node *node)
{
dom_exception exc; /* returned by libdom functions */
dom_string *title;
char *title_str;
bool success;
exc = dom_node_get_text_content(node, &title);
if ((exc != DOM_NO_ERR) || (title == NULL)) {
return false;
}
title_str = squash_whitespace(dom_string_data(title));
dom_string_unref(title);
if (title_str == NULL) {
return false;
}
success = content__set_title(&c->base, title_str);
free(title_str);
return success;
}
/**
* process a base element being inserted into the DOM
*
* \param htmlc The html content containing the DOM
* \param node The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static bool html_process_inserted_base(html_content *htmlc, dom_node *node)
{
dom_exception exc; /* returned by libdom functions */
dom_string *atr_string;
/* get href attribute if present */
exc = dom_element_get_attribute(node, corestring_dom_href, &atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
nsurl *url;
nserror error;
/* get url from string */
error = nsurl_create(dom_string_data(atr_string), &url);
dom_string_unref(atr_string);
if (error == NSERROR_OK) {
if (htmlc->base_url != NULL) {
nsurl_unref(htmlc->base_url);
}
htmlc->base_url = url;
}
}
/* get target attribute if present and not already set */
if (htmlc->base_target != NULL) {
return true;
}
exc = dom_element_get_attribute(node,
corestring_dom_target,
&atr_string);
if ((exc == DOM_NO_ERR) && (atr_string != NULL)) {
/* Validation rules from the HTML5 spec for the base element:
* The target must be one of _blank, _self, _parent, or
* _top or any identifier which does not begin with an
* underscore
*/
if (*dom_string_data(atr_string) != '_' ||
dom_string_caseless_lwc_isequal(atr_string,
corestring_lwc__blank) ||
dom_string_caseless_lwc_isequal(atr_string,
corestring_lwc__self) ||
dom_string_caseless_lwc_isequal(atr_string,
corestring_lwc__parent) ||
dom_string_caseless_lwc_isequal(atr_string,
corestring_lwc__top)) {
htmlc->base_target = strdup(dom_string_data(atr_string));
}
dom_string_unref(atr_string);
}
return true;
}
/**
* process a META element being inserted into the DOM
*
* \note only the http-equiv attribute for refresh is currently considered
*
* \param htmlc The html content containing the DOM
* \param n The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static nserror html_process_inserted_meta(html_content *c, dom_node *n)
{
union content_msg_data msg_data;
const char *url, *end, *refresh = NULL;
char *new_url;
char quote = '\0';
dom_string *equiv, *content;
dom_exception exc;
nsurl *nsurl;
nserror error = NSERROR_OK;
if (c->refresh) {
/* refresh already delt with */
return NSERROR_OK;
}
exc = dom_element_get_attribute(n, corestring_dom_http_equiv, &equiv);
if (exc != DOM_NO_ERR) {
return NSERROR_DOM;
}
if (equiv == NULL) {
return NSERROR_OK;
}
if (!dom_string_caseless_lwc_isequal(equiv, corestring_lwc_refresh)) {
dom_string_unref(equiv);
return NSERROR_OK;
}
dom_string_unref(equiv);
exc = dom_element_get_attribute(n, corestring_dom_content, &content);
if (exc != DOM_NO_ERR) {
return NSERROR_DOM;
}
if (content == NULL) {
return NSERROR_OK;
}
end = dom_string_data(content) + dom_string_byte_length(content);
/* content := *LWS intpart fracpart? *LWS [';' *LWS *1url *LWS]
* intpart := 1*DIGIT
* fracpart := 1*('.' | DIGIT)
* url := "url" *LWS '=' *LWS (url-nq | url-sq | url-dq)
* url-nq := *urlchar
* url-sq := "'" *(urlchar | '"') "'"
* url-dq := '"' *(urlchar | "'") '"'
* urlchar := [#x9#x21#x23-#x26#x28-#x7E] | nonascii
* nonascii := [#x80-#xD7FF#xE000-#xFFFD#x10000-#x10FFFF]
*/
url = dom_string_data(content);
/* *LWS */
while (url < end && ascii_is_space(*url)) {
url++;
}
/* intpart */
if (url == end || (*url < '0' || '9' < *url)) {
/* Empty content, or invalid timeval */
dom_string_unref(content);
return NSERROR_OK;
}
msg_data.delay = (int) strtol(url, &new_url, 10);
/* a very small delay and self-referencing URL can cause a loop
* that grinds machines to a halt. To prevent this we set a
* minimum refresh delay of 1s. */
if (msg_data.delay < 1) {
msg_data.delay = 1;
}
url = new_url;
/* fracpart? (ignored, as delay is integer only) */
while (url < end && (('0' <= *url && *url <= '9') ||
*url == '.')) {
url++;
}
/* *LWS */
while (url < end && ascii_is_space(*url)) {
url++;
}
/* ';' */
if (url < end && *url == ';')
url++;
/* *LWS */
while (url < end && ascii_is_space(*url)) {
url++;
}
if (url == end) {
/* Just delay specified, so refresh current page */
dom_string_unref(content);
c->base.refresh = nsurl_ref(content_get_url(&c->base));
content_broadcast(&c->base, CONTENT_MSG_REFRESH, &msg_data);
return NSERROR_OK;
}
/* "url" */
if (url <= end - 3) {
if (strncasecmp(url, "url", 3) == 0) {
url += 3;
} else {
/* Unexpected input, ignore this header */
dom_string_unref(content);
return NSERROR_OK;
}
} else {
/* Insufficient input, ignore this header */
dom_string_unref(content);
return NSERROR_OK;
}
/* *LWS */
while (url < end && ascii_is_space(*url)) {
url++;
}
/* '=' */
if (url < end) {
if (*url == '=') {
url++;
} else {
/* Unexpected input, ignore this header */
dom_string_unref(content);
return NSERROR_OK;
}
} else {
/* Insufficient input, ignore this header */
dom_string_unref(content);
return NSERROR_OK;
}
/* *LWS */
while (url < end && ascii_is_space(*url)) {
url++;
}
/* '"' or "'" */
if (url < end && (*url == '"' || *url == '\'')) {
quote = *url;
url++;
}
/* Start of URL */
refresh = url;
if (quote != 0) {
/* url-sq | url-dq */
while (url < end && *url != quote)
url++;
} else {
/* url-nq */
while (url < end && !ascii_is_space(*url))
url++;
}
/* '"' or "'" or *LWS (we don't care) */
if (url > refresh) {
/* There's a URL */
new_url = strndup(refresh, url - refresh);
if (new_url == NULL) {
dom_string_unref(content);
return NSERROR_NOMEM;
}
error = nsurl_join(c->base_url, new_url, &nsurl);
if (error == NSERROR_OK) {
/* broadcast valid refresh url */
c->base.refresh = nsurl;
content_broadcast(&c->base,
CONTENT_MSG_REFRESH,
&msg_data);
c->refresh = true;
}
free(new_url);
}
dom_string_unref(content);
return error;
}
/**
* Process title element being inserted into the DOM.
*
* https://html.spec.whatwg.org/multipage/semantics.html#the-title-element
*
* \param htmlc The html content containing the DOM
* \param node The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static nserror html_process_inserted_title(html_content *htmlc, dom_node *node)
{
if (htmlc->title == NULL) {
/* only the first title is considered */
htmlc->title = dom_node_ref(node);
}
return NSERROR_OK;
}
/**
* Process img element being inserted into the DOM.
*
* \param htmlc The html content containing the DOM
* \param node The DOM node being inserted
* \return NSERROR_OK on success else appropriate error code
*/
static bool html_process_inserted_img(html_content *htmlc, dom_node *node)
{
dom_string *src;
nsurl *url;
nserror err;
dom_exception exc;
bool success;
/* Do nothing if foreground images are disabled */
if (nsoption_bool(foreground_images) == false) {
return true;
}
exc = dom_element_get_attribute(node, corestring_dom_src, &src);
if (exc != DOM_NO_ERR || src == NULL) {
return true;
}
err = nsurl_join(htmlc->base_url, dom_string_data(src), &url);
if (err != NSERROR_OK) {
dom_string_unref(src);
return false;
}
dom_string_unref(src);
/* Speculatively fetch the image */
success = html_fetch_object(htmlc, url, NULL, CONTENT_IMAGE, false);
nsurl_unref(url);
return success;
}
static void html_get_dimensions(html_content *htmlc)
{
unsigned w;
@ -858,272 +400,6 @@ void html_finish_conversion(html_content *htmlc)
dom_node_unref(html);
}
/* handler for a SCRIPT which has been added to a tree */
static void
dom_SCRIPT_showed_up(html_content *htmlc, dom_html_script_element *script)
{
dom_exception exc;
dom_html_script_element_flags flags;
dom_hubbub_error res;
bool within;
if (!htmlc->enable_scripting) {
NSLOG(netsurf, INFO, "Encountered a script, but scripting is off, ignoring");
return;
}
NSLOG(netsurf, DEEPDEBUG, "Encountered a script, node %p showed up", script);
exc = dom_html_script_element_get_flags(script, &flags);
if (exc != DOM_NO_ERR) {
NSLOG(netsurf, DEEPDEBUG, "Unable to retrieve flags, giving up");
return;
}
if (flags & DOM_HTML_SCRIPT_ELEMENT_FLAG_PARSER_INSERTED) {
NSLOG(netsurf, DEBUG, "Script was parser inserted, skipping");
return;
}
exc = dom_node_contains(htmlc->document, script, &within);
if (exc != DOM_NO_ERR) {
NSLOG(netsurf, DEBUG, "Unable to determine if script was within document, ignoring");
return;
}
if (!within) {
NSLOG(netsurf, DEBUG, "Script was not within the document, ignoring for now");
return;
}
res = html_process_script(htmlc, (dom_node *) script);
if (res == DOM_HUBBUB_OK) {
NSLOG(netsurf, DEEPDEBUG, "Inserted script has finished running");
} else {
if (res == (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_PAUSED)) {
NSLOG(netsurf, DEEPDEBUG, "Inserted script has launced asynchronously");
} else {
NSLOG(netsurf, DEEPDEBUG, "Failure starting script");
}
}
}
/* callback for DOMNodeInserted end type */
static void
dom_default_action_DOMNodeInserted_cb(struct dom_event *evt, void *pw)
{
dom_event_target *node;
dom_node_type type;
dom_exception exc;
html_content *htmlc = pw;
exc = dom_event_get_target(evt, &node);
if ((exc != DOM_NO_ERR) || (node == NULL)) {
/* failed to obtain the event target node */
return;
}
exc = dom_node_get_node_type(node, &type);
if ((exc == DOM_NO_ERR) && (type == DOM_ELEMENT_NODE)) {
/* an element node has been inserted */
dom_html_element_type tag_type;
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_BASE:
html_process_inserted_base(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_IMG:
html_process_inserted_img(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_LINK:
html_process_inserted_link(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_META:
html_process_inserted_meta(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_STYLE:
html_css_process_style(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_SCRIPT:
dom_SCRIPT_showed_up(htmlc,
(dom_html_script_element *)node);
break;
case DOM_HTML_ELEMENT_TYPE_TITLE:
html_process_inserted_title(htmlc, (dom_node *)node);
break;
default:
break;
}
if (htmlc->enable_scripting) {
/* ensure javascript context is available */
if (htmlc->jsthread == NULL) {
union content_msg_data msg_data;
msg_data.jsthread = &htmlc->jsthread;
content_broadcast(&htmlc->base,
CONTENT_MSG_GETTHREAD,
&msg_data);
NSLOG(netsurf, INFO,
"javascript context: %p (htmlc: %p)",
htmlc->jsthread,
htmlc);
}
if (htmlc->jsthread != NULL) {
js_handle_new_element(htmlc->jsthread,
(dom_element *) node);
}
}
}
dom_node_unref(node);
}
/* callback for DOMNodeInsertedIntoDocument end type */
static void
dom_default_action_DOMNodeInsertedIntoDocument_cb(struct dom_event *evt, void *pw)
{
html_content *htmlc = pw;
dom_event_target *node;
dom_node_type type;
dom_exception exc;
exc = dom_event_get_target(evt, &node);
if ((exc == DOM_NO_ERR) && (node != NULL)) {
exc = dom_node_get_node_type(node, &type);
if ((exc == DOM_NO_ERR) && (type == DOM_ELEMENT_NODE)) {
/* an element node has been modified */
dom_html_element_type tag_type;
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_SCRIPT:
dom_SCRIPT_showed_up(htmlc, (dom_html_script_element *) node);
default:
break;
}
}
dom_node_unref(node);
}
}
/* Deal with input elements being modified by resyncing their gadget
* if they have one.
*/
static void html_texty_element_update(html_content *htmlc, dom_node *node)
{
struct box *box = box_for_node(node);
if (box == NULL) {
return; /* No Box (yet?) so no gadget to update */
}
if (box->gadget == NULL) {
return; /* No gadget yet (under construction perhaps?) */
}
form_gadget_sync_with_dom(box->gadget);
/* And schedule a redraw for the box */
html__redraw_a_box(htmlc, box);
}
/* callback for DOMSubtreeModified end type */
static void
dom_default_action_DOMSubtreeModified_cb(struct dom_event *evt, void *pw)
{
dom_event_target *node;
dom_node_type type;
dom_exception exc;
html_content *htmlc = pw;
exc = dom_event_get_target(evt, &node);
if ((exc == DOM_NO_ERR) && (node != NULL)) {
if (htmlc->title == (dom_node *)node) {
/* Node is our title node */
html_process_title(htmlc, (dom_node *)node);
dom_node_unref(node);
return;
}
exc = dom_node_get_node_type(node, &type);
if ((exc == DOM_NO_ERR) && (type == DOM_ELEMENT_NODE)) {
/* an element node has been modified */
dom_html_element_type tag_type;
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_STYLE:
html_css_update_style(htmlc, (dom_node *)node);
break;
case DOM_HTML_ELEMENT_TYPE_TEXTAREA:
case DOM_HTML_ELEMENT_TYPE_INPUT:
html_texty_element_update(htmlc, (dom_node *)node);
default:
break;
}
}
dom_node_unref(node);
}
}
static void
dom_default_action_finished_cb(struct dom_event *evt, void *pw)
{
html_content *htmlc = pw;
if (htmlc->jsthread != NULL)
js_event_cleanup(htmlc->jsthread, evt);
}
/* callback function selector
*
* selects a callback function for libdom to call based on the type and phase.
* dom_default_action_phase from events/document_event.h
*
* The principle events are:
* DOMSubtreeModified
* DOMAttrModified
* DOMNodeInserted
* DOMNodeInsertedIntoDocument
*
* @return callback function pointer or NULL for none
*/
static dom_default_action_callback
dom_event_fetcher(dom_string *type,
dom_default_action_phase phase,
void **pw)
{
NSLOG(netsurf, DEEPDEBUG, "phase:%d type:%s", phase, dom_string_data(type));
if (phase == DOM_DEFAULT_ACTION_END) {
if (dom_string_isequal(type, corestring_dom_DOMNodeInserted)) {
return dom_default_action_DOMNodeInserted_cb;
} else if (dom_string_isequal(type, corestring_dom_DOMNodeInsertedIntoDocument)) {
return dom_default_action_DOMNodeInsertedIntoDocument_cb;
} else if (dom_string_isequal(type, corestring_dom_DOMSubtreeModified)) {
return dom_default_action_DOMSubtreeModified_cb;
}
} else if (phase == DOM_DEFAULT_ACTION_FINISHED) {
return dom_default_action_finished_cb;
}
return NULL;
}
static void
html_document_user_data_handler(dom_node_operation operation,
@ -1241,7 +517,7 @@ html_create_html_data(html_content *c, const http_parameter *params)
parse_params.msg = NULL;
parse_params.script = html_process_script;
parse_params.ctx = c;
parse_params.daf = dom_event_fetcher;
parse_params.daf = html_dom_event_fetcher;
error = dom_hubbub_parser_create(&parse_params,
&c->parser,
@ -1385,7 +661,7 @@ html_process_encoding_change(struct content *c,
parse_params.msg = NULL;
parse_params.script = html_process_script;
parse_params.ctx = html;
parse_params.daf = dom_event_fetcher;
parse_params.daf = html_dom_event_fetcher;
/* Create new binding, using the new encoding */
error = dom_hubbub_parser_create(&parse_params,