464 lines
12 KiB
C
464 lines
12 KiB
C
/**
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* $Id: html.c,v 1.17 2003/05/10 11:13:34 bursa Exp $
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*/
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#include <assert.h>
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#include <string.h>
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#include <strings.h>
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#include <stdlib.h>
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#include "netsurf/content/fetch.h"
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#include "netsurf/content/fetchcache.h"
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#include "netsurf/desktop/gui.h"
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#include "netsurf/render/html.h"
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#include "netsurf/render/layout.h"
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#include "netsurf/utils/utils.h"
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#include "netsurf/utils/log.h"
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struct fetch_data {
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struct content *c;
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unsigned int i;
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};
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static void html_convert_css_callback(fetchcache_msg msg, struct content *css,
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void *p, const char *error);
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static void html_title(struct content *c, xmlNode *head);
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static void html_find_stylesheets(struct content *c, xmlNode *head);
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static void html_image_callback(fetchcache_msg msg, struct content *image,
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void *p, const char *error);
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void html_create(struct content *c)
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{
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c->data.html.parser = htmlCreatePushParserCtxt(0, 0, "", 0, 0, XML_CHAR_ENCODING_8859_1);
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c->data.html.layout = NULL;
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c->data.html.style = NULL;
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c->data.html.fonts = NULL;
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}
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#define CHUNK 4096
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void html_process_data(struct content *c, char *data, unsigned long size)
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{
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unsigned long x;
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for (x = 0; x + CHUNK <= size; x += CHUNK) {
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htmlParseChunk(c->data.html.parser, data + x, CHUNK, 0);
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gui_multitask();
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}
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htmlParseChunk(c->data.html.parser, data + x, (int) (size - x), 0);
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}
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int html_convert(struct content *c, unsigned int width, unsigned int height)
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{
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unsigned int i;
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xmlDoc *document;
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xmlNode *html, *head;
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/* finish parsing */
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htmlParseChunk(c->data.html.parser, "", 0, 1);
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document = c->data.html.parser->myDoc;
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/*xmlDebugDumpDocument(stderr, c->data.html.parser->myDoc);*/
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htmlFreeParserCtxt(c->data.html.parser);
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if (document == NULL) {
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LOG(("Parsing failed"));
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return 1;
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}
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/* locate html and head elements */
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for (html = document->children;
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html != 0 && html->type != XML_ELEMENT_NODE;
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html = html->next)
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;
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if (html == 0 || strcmp((const char *) html->name, "html") != 0) {
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LOG(("html element not found"));
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xmlFreeDoc(document);
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return 1;
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}
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for (head = html->children;
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head != 0 && head->type != XML_ELEMENT_NODE;
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head = head->next)
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;
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if (strcmp((const char *) head->name, "head") != 0) {
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head = 0;
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LOG(("head element not found"));
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}
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if (head != 0)
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html_title(c, head);
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/* get stylesheets */
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html_find_stylesheets(c, head);
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/* convert xml tree to box tree */
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LOG(("XML to box"));
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xml_to_box(html, c);
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/*box_dump(c->data.html.layout->children, 0);*/
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/* XML tree and stylesheets not required past this point */
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xmlFreeDoc(document);
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cache_free(c->data.html.stylesheet_content[0]);
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if (c->data.html.stylesheet_content[1] != 0)
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content_destroy(c->data.html.stylesheet_content[1]);
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for (i = 2; i != c->data.html.stylesheet_count; i++)
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if (c->data.html.stylesheet_content[i] != 0)
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cache_free(c->data.html.stylesheet_content[i]);
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xfree(c->data.html.stylesheet_content);
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/* layout the box tree */
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c->status_callback(c->status_p, "Formatting document");
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LOG(("Layout document"));
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layout_document(c->data.html.layout->children, width);
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/*box_dump(c->data.html.layout->children, 0);*/
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c->width = c->data.html.layout->children->width;
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c->height = c->data.html.layout->children->height;
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if (c->active != 0)
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c->status = CONTENT_PENDING;
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return 0;
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}
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void html_convert_css_callback(fetchcache_msg msg, struct content *css,
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void *p, const char *error)
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{
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struct fetch_data *data = p;
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struct content *c = data->c;
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unsigned int i = data->i;
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switch (msg) {
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case FETCHCACHE_OK:
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free(data);
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LOG(("got stylesheet '%s'", css->url));
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c->data.html.stylesheet_content[i] = css;
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/*css_dump_stylesheet(css->data.css);*/
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c->active--;
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break;
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case FETCHCACHE_BADTYPE:
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case FETCHCACHE_ERROR:
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free(data);
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c->data.html.stylesheet_content[i] = 0;
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c->active--;
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c->error = 1;
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break;
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case FETCHCACHE_STATUS:
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/* TODO: need to add a way of sending status to the
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* owning window */
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break;
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default:
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assert(0);
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}
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}
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void html_title(struct content *c, xmlNode *head)
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{
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xmlNode *node;
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xmlChar *title;
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c->title = 0;
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for (node = head->children; node != 0; node = node->next) {
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if (strcmp(node->name, "title") == 0) {
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title = xmlNodeGetContent(node);
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c->title = squash_tolat1(title);
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xmlFree(title);
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return;
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}
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}
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}
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void html_find_stylesheets(struct content *c, xmlNode *head)
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{
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xmlNode *node, *node2;
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char *rel, *type, *media, *href, *data, *url;
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char status[80];
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unsigned int i = 2;
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struct fetch_data *fetch_data;
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/* stylesheet 0 is the base style sheet, stylesheet 1 is any <style> elements */
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c->data.html.stylesheet_content = xcalloc(2, sizeof(*c->data.html.stylesheet_content));
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c->data.html.stylesheet_content[1] = 0;
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c->data.html.stylesheet_count = 2;
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c->error = 0;
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c->active = 0;
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fetch_data = xcalloc(1, sizeof(*fetch_data));
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fetch_data->c = c;
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fetch_data->i = 0;
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c->active++;
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fetchcache("file:///%3CNetSurf$Dir%3E/Resources/CSS", c->url,
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html_convert_css_callback,
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fetch_data, c->width, c->height, 1 << CONTENT_CSS);
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for (node = head == 0 ? 0 : head->children; node != 0; node = node->next) {
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if (strcmp(node->name, "link") == 0) {
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/* rel='stylesheet' */
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if (!(rel = (char *) xmlGetProp(node, (const xmlChar *) "rel")))
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continue;
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if (strcasecmp(rel, "stylesheet") != 0) {
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xmlFree(rel);
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continue;
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}
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xmlFree(rel);
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/* type='text/css' or not present */
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if ((type = (char *) xmlGetProp(node, (const xmlChar *) "type"))) {
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if (strcmp(type, "text/css") != 0) {
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xmlFree(type);
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continue;
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}
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xmlFree(type);
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}
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/* media contains 'screen' or 'all' or not present */
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if ((media = (char *) xmlGetProp(node, (const xmlChar *) "media"))) {
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if (strstr(media, "screen") == 0 &&
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strstr(media, "all") == 0) {
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xmlFree(media);
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continue;
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}
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xmlFree(media);
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}
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/* href='...' */
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if (!(href = (char *) xmlGetProp(node, (const xmlChar *) "href")))
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continue;
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url = url_join(href, c->url);
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LOG(("linked stylesheet %i '%s'", i, url));
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xmlFree(href);
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/* start fetch */
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c->data.html.stylesheet_content = xrealloc(c->data.html.stylesheet_content,
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(i + 1) * sizeof(*c->data.html.stylesheet_content));
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fetch_data = xcalloc(1, sizeof(*fetch_data));
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fetch_data->c = c;
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fetch_data->i = i;
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c->active++;
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fetchcache(url, c->url, html_convert_css_callback,
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fetch_data, c->width, c->height, 1 << CONTENT_CSS);
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free(url);
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i++;
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} else if (strcmp(node->name, "style") == 0) {
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/* type='text/css' */
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if (!(type = (char *) xmlGetProp(node, (const xmlChar *) "type")))
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continue;
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if (strcmp(type, "text/css") != 0) {
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xmlFree(type);
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continue;
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}
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xmlFree(type);
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/* media contains 'screen' or 'all' or not present */
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if ((media = (char *) xmlGetProp(node, (const xmlChar *) "media"))) {
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if (strstr(media, "screen") == 0 &&
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strstr(media, "all") == 0) {
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xmlFree(media);
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continue;
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}
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xmlFree(media);
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}
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/* create stylesheet */
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LOG(("style element"));
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if (c->data.html.stylesheet_content[1] == 0)
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c->data.html.stylesheet_content[1] = content_create(CONTENT_CSS, c->url);
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/* can't just use xmlNodeGetContent(node), because that won't give
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* the content of comments which may be used to 'hide' the content */
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for (node2 = node->children; node2 != 0; node2 = node2->next) {
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data = xmlNodeGetContent(node2);
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content_process_data(c->data.html.stylesheet_content[1],
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data, strlen(data));
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xmlFree(data);
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}
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}
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}
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c->data.html.stylesheet_count = i;
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if (c->data.html.stylesheet_content[1] != 0)
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content_convert(c->data.html.stylesheet_content[1], c->width, c->height);
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/* complete the fetches */
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while (c->active != 0) {
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if (c->status_callback != 0) {
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sprintf(status, "Loading %u stylesheets", c->active);
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c->status_callback(c->status_p, status);
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}
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fetch_poll();
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gui_multitask();
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}
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if (c->error) {
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c->status_callback(c->status_p, "Warning: some stylesheets failed to load");
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}
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}
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void html_fetch_image(struct content *c, char *url, struct box *box)
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{
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struct fetch_data *fetch_data;
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/* add to object list */
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c->data.html.object = xrealloc(c->data.html.object,
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(c->data.html.object_count + 1) *
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sizeof(*c->data.html.object));
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c->data.html.object[c->data.html.object_count].url = url;
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c->data.html.object[c->data.html.object_count].content = 0;
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c->data.html.object[c->data.html.object_count].box = box;
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/* start fetch */
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fetch_data = xcalloc(1, sizeof(*fetch_data));
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fetch_data->c = c;
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fetch_data->i = c->data.html.object_count;
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c->data.html.object_count++;
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c->active++;
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fetchcache(url, c->url,
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html_image_callback,
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fetch_data, 0, 0,
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(1 << CONTENT_JPEG) | (1 << CONTENT_PNG));
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}
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void html_image_callback(fetchcache_msg msg, struct content *image,
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void *p, const char *error)
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{
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struct fetch_data *data = p;
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struct content *c = data->c;
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unsigned int i = data->i;
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struct box *box = c->data.html.object[i].box;
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switch (msg) {
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case FETCHCACHE_OK:
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LOG(("got image '%s'", image->url));
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box->object = image;
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c->data.html.object[i].content = image;
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/* set dimensions to object dimensions if auto */
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if (box->style->width.width == CSS_WIDTH_AUTO) {
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box->style->width.width = CSS_WIDTH_LENGTH;
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box->style->width.value.length.unit = CSS_UNIT_PX;
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box->style->width.value.length.value = image->width;
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box->min_width = box->max_width = box->width = image->width;
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/* invalidate parent min, max widths */
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if (box->parent->max_width != UNKNOWN_MAX_WIDTH) {
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struct box *b = box->parent;
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if (b->min_width < image->width)
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b->min_width = image->width;
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if (b->max_width < image->width)
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b->max_width = image->width;
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for (b = b->parent;
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b != 0 && b->max_width != UNKNOWN_MAX_WIDTH;
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b = b->parent)
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b->max_width = UNKNOWN_MAX_WIDTH;
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}
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}
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if (box->style->height.height == CSS_HEIGHT_AUTO) {
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box->style->height.height = CSS_HEIGHT_LENGTH;
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box->style->height.length.unit = CSS_UNIT_PX;
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box->style->height.length.value = image->height;
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}
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/* remove alt text */
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if (box->text != 0) {
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free(box->text);
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box->text = 0;
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box->length = 0;
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}
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/*if (box->children != 0) {
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box_free(box->children);
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box->children = 0;
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}*/
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/* TODO: recalculate min, max width */
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/* drop through */
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case FETCHCACHE_BADTYPE:
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case FETCHCACHE_ERROR:
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if (c->active == 1 && c->status == CONTENT_PENDING) {
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/* all images have arrived */
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content_reformat(c, c->available_width, 0);
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/*box_dump(c->data.html.layout->children, 0);*/
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}
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c->active--;
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if (c->active == 0)
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sprintf(c->status_message, "Document done");
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else
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sprintf(c->status_message, "Loading %i images", c->active);
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free(data);
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break;
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case FETCHCACHE_STATUS:
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/* TODO: need to add a way of sending status to the
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* owning window */
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break;
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default:
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assert(0);
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}
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}
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void html_revive(struct content *c, unsigned int width, unsigned int height)
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{
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unsigned int i;
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struct fetch_data *fetch_data;
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/* reload images and fix pointers */
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for (i = 0; i != c->data.html.object_count; i++) {
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if (c->data.html.object[i].content != 0) {
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fetch_data = xcalloc(1, sizeof(*fetch_data));
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fetch_data->c = c;
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fetch_data->i = i;
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c->active++;
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fetchcache(c->data.html.object[i].url, c->url,
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html_image_callback,
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fetch_data, 0, 0,
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(1 << CONTENT_JPEG) | (1 << CONTENT_PNG));
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}
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}
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layout_document(c->data.html.layout->children, width);
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c->width = c->data.html.layout->children->width;
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c->height = c->data.html.layout->children->height;
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if (c->active != 0)
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c->status = CONTENT_PENDING;
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}
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void html_reformat(struct content *c, unsigned int width, unsigned int height)
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{
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layout_document(c->data.html.layout->children, width);
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c->width = c->data.html.layout->children->width;
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c->height = c->data.html.layout->children->height;
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}
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void html_destroy(struct content *c)
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{
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unsigned int i;
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LOG(("content %p", c));
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LOG(("layout %p", c->data.html.layout));
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if (c->data.html.layout != 0)
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box_free(c->data.html.layout);
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LOG(("fonts %p", c->data.html.fonts));
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if (c->data.html.fonts != 0)
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font_free_set(c->data.html.fonts);
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LOG(("title %p", c->title));
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if (c->title != 0)
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xfree(c->title);
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for (i = 0; i != c->data.html.object_count; i++) {
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LOG(("object %i %p", i, c->data.html.object[i].content));
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if (c->data.html.object[i].content != 0)
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cache_free(c->data.html.object[i].content);
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free(c->data.html.object[i].url);
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}
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free(c->data.html.object);
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}
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