diff options
Diffstat (limited to 'render/html_script.c')
-rw-r--r-- | render/html_script.c | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/render/html_script.c b/render/html_script.c new file mode 100644 index 000000000..f925cfedf --- /dev/null +++ b/render/html_script.c @@ -0,0 +1,339 @@ +/* + * Copyright 2012 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 + * Content for text/html scripts (implementation). + */ + +#include <assert.h> +#include <ctype.h> +#include <stdint.h> +#include <stdbool.h> +#include <string.h> +#include <strings.h> +#include <stdlib.h> + +#include "utils/config.h" +#include "utils/log.h" +#include "utils/messages.h" +#include "javascript/js.h" +#include "content/content_protected.h" +#include "content/fetch.h" +#include "render/html_internal.h" + +typedef bool (script_handler_t)(struct jscontext *jscontext, const char *data, size_t size) ; + + +static script_handler_t *select_script_handler(content_type ctype) +{ + if (ctype == CONTENT_JS) { + return js_exec; + } + return NULL; +} + + +/* attempt to progress script execution + * + * execute scripts using algorithm found in: + * http://www.whatwg.org/specs/web-apps/current-work/multipage/scripting-1.html#the-script-element + * + */ +static bool html_scripts_exec(html_content *c) +{ + unsigned int i; + struct html_script *s; + script_handler_t *script_handler; + + if (c->jscontext == NULL) + return false; + + for (i = 0, s = c->scripts; i != c->scripts_count; i++, s++) { + if (s->already_started) { + continue; + } + + assert((s->type == HTML_SCRIPT_EXTERNAL) || + (s->type == HTML_SCRIPT_INTERNAL)); + + if (s->type == HTML_SCRIPT_EXTERNAL) { + /* ensure script content is present */ + if (s->data.external == NULL) + continue; + + /* ensure script content fetch status is not an error */ + if (content_get_status(s->data.external) == CONTENT_STATUS_ERROR) + continue; + + /* ensure script handler for content type */ + script_handler = select_script_handler(content_get_type(s->data.external)); + if (script_handler == NULL) + continue; /* unsupported type */ + + if (content_get_status(s->data.external) == CONTENT_STATUS_DONE) { + /* external script is now available */ + const char *data; + unsigned long size; + data = content_get_source_data(s->data.external, &size ); + script_handler(c->jscontext, data, size); + + s->already_started = true; + + } else { + /* script not yet available */ + + /* check if deferable or asynchronous */ + if (!s->defer && !s->async) { + break; + } + } + } + } + + return true; +} + +/* create new html script entry */ +static struct html_script * +html_process_new_script(html_content *c, enum html_script_type type) +{ + struct html_script *nscript; + /* add space for new script entry */ + nscript = realloc(c->scripts, + sizeof(struct html_script) * (c->scripts_count + 1)); + if (nscript == NULL) { + return NULL; + } + + c->scripts = nscript; + + /* increment script entry count */ + nscript = &c->scripts[c->scripts_count]; + c->scripts_count++; + + nscript->already_started = false; + nscript->parser_inserted = false; + nscript->force_async = true; + nscript->ready_exec = false; + nscript->async = false; + nscript->defer = false; + + nscript->type = type; + + return nscript; +} + +/** + * Callback for fetchcache() for linked stylesheets. + */ + +static nserror +html_convert_script_callback(hlcache_handle *script, + const hlcache_event *event, + void *pw) +{ + html_content *parent = pw; + unsigned int i; + struct html_script *s; + + /* Find script */ + for (i = 0, s = parent->scripts; i != parent->scripts_count; i++, s++) { + if (s->type == HTML_SCRIPT_EXTERNAL && + s->data.external == script) + break; + } + + assert(i != parent->scripts_count); + + switch (event->type) { + case CONTENT_MSG_LOADING: + break; + + case CONTENT_MSG_READY: + break; + + case CONTENT_MSG_DONE: + LOG(("script %d done '%s'", i, + nsurl_access(hlcache_handle_get_url(script)))); + parent->base.active--; + LOG(("%d fetches active", parent->base.active)); + + /* script finished loading so try and continue execution */ + html_scripts_exec(parent); + break; + + case CONTENT_MSG_ERROR: + LOG(("script %s failed: %s", + nsurl_access(hlcache_handle_get_url(script)), + event->data.error)); + hlcache_handle_release(script); + s->data.external = NULL; + parent->base.active--; + LOG(("%d fetches active", parent->base.active)); + content_add_error(&parent->base, "?", 0); + + /* script failed loading so try and continue execution */ + html_scripts_exec(parent); + + break; + + case CONTENT_MSG_STATUS: + html_set_status(parent, content_get_status_message(script)); + content_broadcast(&parent->base, CONTENT_MSG_STATUS, + event->data); + break; + + default: + assert(0); + } + + if (parent->base.active == 0) + html_finish_conversion(parent); + + return NSERROR_OK; +} + +/** process script node + * + * + */ +dom_hubbub_error +html_process_script(void *ctx, dom_node *node) +{ + html_content *c = (html_content *)ctx; + dom_exception exc; /* returned by libdom functions */ + dom_string *src, *script, *mimetype; + struct html_script *nscript; + union content_msg_data msg_data; + + /* ensure javascript context is available */ + if (c->jscontext == NULL) { + union content_msg_data msg_data; + + msg_data.jscontext = &c->jscontext; + content_broadcast(&c->base, CONTENT_MSG_GETCTX, msg_data); + LOG(("javascript context %p ", c->jscontext)); + if (c->jscontext == NULL) { + /* no context and it could not be created, abort */ + return DOM_HUBBUB_OK; + } + } + + LOG(("content %p parser %p node %p",c,c->parser_binding, node)); + + exc = dom_element_get_attribute(node, html_dom_string_type, &mimetype); + if (exc != DOM_NO_ERR || mimetype == NULL) { + mimetype = dom_string_ref(html_dom_string_text_javascript); + } + + exc = dom_element_get_attribute(node, html_dom_string_src, &src); + if (exc != DOM_NO_ERR || src == NULL) { + struct lwc_string_s *lwcmimetype; + script_handler_t *script_handler; + + /* does not appear to be a src so script is inline content */ + exc = dom_node_get_text_content(node, &script); + if ((exc != DOM_NO_ERR) || (script == NULL)) { + dom_string_unref(mimetype); + return DOM_HUBBUB_OK; /* no contents, skip */ + } + + nscript = html_process_new_script(c, HTML_STYLESHEET_INTERNAL); + if (nscript == NULL) { + dom_string_unref(mimetype); + dom_string_unref(script); + goto html_process_script_no_memory; + } + + nscript->data.internal = script; + nscript->mimetype = mimetype; + nscript->already_started = true; + + /* charset (encoding) */ + + /* ensure script handler for content type */ + dom_string_intern(mimetype, &lwcmimetype); + script_handler = select_script_handler(content_factory_type_from_mime_type(lwcmimetype)); + lwc_string_unref(lwcmimetype); + + if (script_handler != NULL) { + script_handler(c->jscontext, + dom_string_data(script), + dom_string_byte_length(script)); + } + + + } else { + /* script with a src tag */ + nserror ns_error; + nsurl *joined; + hlcache_child_context child; + + + nscript = html_process_new_script(c, HTML_STYLESHEET_EXTERNAL); + if (nscript == NULL) { + dom_string_unref(src); + dom_string_unref(mimetype); + goto html_process_script_no_memory; + } + + /* charset (encoding) */ + + ns_error = nsurl_join(c->base_url, dom_string_data(src), &joined); + dom_string_unref(src); + if (ns_error != NSERROR_OK) { + dom_string_unref(mimetype); + goto html_process_script_no_memory; + } + + nscript->mimetype = mimetype; /* keep reference to mimetype */ + + LOG(("script %i '%s'", c->scripts_count, nsurl_access(joined))); + + child.charset = c->encoding; + child.quirks = c->base.quirks; + + ns_error = hlcache_handle_retrieve(joined, + 0, + content_get_url(&c->base), + NULL, + html_convert_script_callback, + c, + &child, + CONTENT_SCRIPT, + &nscript->data.external); + + nsurl_unref(joined); + + if (ns_error != NSERROR_OK) { + goto html_process_script_no_memory; + } + + c->base.active++; /* ensure base content knows the fetch is active */ + LOG(("%d fetches active", c->base.active)); + + } + html_scripts_exec(c); + + return DOM_HUBBUB_OK; + +html_process_script_no_memory: + msg_data.error = messages_get("NoMemory"); + content_broadcast(&c->base, CONTENT_MSG_ERROR, msg_data); + return DOM_HUBBUB_NOMEM; +} |