From 8e650e3e39771431267aa6275d596516d1e34abb Mon Sep 17 00:00:00 2001
From: John Mark Bell <jmb@netsurf-browser.org>
Date: Fri, 30 Jul 2004 23:40:01 +0000
Subject: [project @ 2004-07-30 23:40:00 by jmb] Rework stylesheet fetching
 code to remove dependence on magic numbers (now uses values defined in
 html.h) Make ad blocking optional.

svn path=/import/netsurf/; revision=1168
---
 !NetSurf/Resources/CSS,f79 |  4 +--
 desktop/browser.c          |  3 ++-
 desktop/options.c          |  3 +++
 desktop/options.h          |  1 +
 render/html.c              | 67 +++++++++++++++++++++++++++++++---------------
 render/html.h              |  9 +++++--
 riscos/save_complete.c     |  6 ++---
 7 files changed, 62 insertions(+), 31 deletions(-)

diff --git a/!NetSurf/Resources/CSS,f79 b/!NetSurf/Resources/CSS,f79
index 6f89ea5c1..2b0575d3d 100644
--- a/!NetSurf/Resources/CSS,f79
+++ b/!NetSurf/Resources/CSS,f79
@@ -1,9 +1,7 @@
 /*
  * This file is part of NetSurf, http://netsurf.sourceforge.net/
  */
-
-@import url('AdBlock');
-
+ 
 /* Elements ordered as in the HTML 4.01 specification. */
 
 html { display: block; }
diff --git a/desktop/browser.c b/desktop/browser.c
index fabd7ab4e..c4dcc5c54 100644
--- a/desktop/browser.c
+++ b/desktop/browser.c
@@ -432,7 +432,8 @@ void browser_window_reload(struct browser_window *bw, bool all)
 				c->data.html.object[i].content->fresh = false;
 		}
 		/* invalidate stylesheets */
-		for (i=2; i!=c->data.html.stylesheet_count; i++) {
+		for (i=STYLESHEET_START;
+			i!=c->data.html.stylesheet_count; i++) {
 			if (c->data.html.stylesheet_content[i] != 0)
 				c->data.html.stylesheet_content[i]->fresh = false;
 		}
diff --git a/desktop/options.c b/desktop/options.c
index c999e0ea6..ab3653e1e 100644
--- a/desktop/options.c
+++ b/desktop/options.c
@@ -51,6 +51,8 @@ char *option_accept_language = 0;
 bool option_ssl_verify_certificates = true;
 /** Preferred maximum size of memory cache / bytes. */
 int option_memory_cache_size = 2 * 1024 * 1024;
+/** Whether to block advertisements */
+bool option_block_ads = false;
 
 EXTRA_OPTION_DEFINE
 
@@ -71,6 +73,7 @@ struct {
 	{ "accept_language", OPTION_STRING,  &option_accept_language },
 	{ "ssl_verify_certificates", OPTION_BOOL, &option_ssl_verify_certificates },
 	{ "memory_cache_size", OPTION_INTEGER, &option_memory_cache_size },
+	{ "block_advertisements", OPTION_BOOL, &option_block_ads },
 	EXTRA_OPTION_TABLE
 };
 
diff --git a/desktop/options.h b/desktop/options.h
index 65fa59fc2..ae35cda94 100644
--- a/desktop/options.h
+++ b/desktop/options.h
@@ -38,6 +38,7 @@ extern int option_font_min_size;
 extern char *option_accept_language;
 extern bool option_ssl_verify_certificates;
 extern int option_memory_cache_size;
+extern bool option_block_ads;
 
 void options_read(const char *path);
 void options_write(const char *path);
diff --git a/render/html.c b/render/html.c
index 5fce63c26..7bda3b02a 100644
--- a/render/html.c
+++ b/render/html.c
@@ -23,6 +23,7 @@
 #ifdef riscos
 #include "netsurf/desktop/gui.h"
 #endif
+#include "netsurf/desktop/options.h"
 #include "netsurf/render/html.h"
 #include "netsurf/render/layout.h"
 #include "netsurf/utils/log.h"
@@ -326,30 +327,52 @@ void html_find_stylesheets(struct content *c, xmlNode *head)
 {
 	xmlNode *node, *node2;
 	char *rel, *type, *media, *href, *data, *url;
-	unsigned int i = 2;
+	unsigned int i = STYLESHEET_START;
 	unsigned int last_active = 0;
 	union content_msg_data msg_data;
 
-	/* stylesheet 0 is the base style sheet, stylesheet 1 is any <style> elements */
-	c->data.html.stylesheet_content = xcalloc(2, sizeof(*c->data.html.stylesheet_content));
-	c->data.html.stylesheet_content[1] = 0;
-	c->data.html.stylesheet_count = 2;
+	/* stylesheet 0 is the base style sheet,
+	 * stylesheet 1 is the adblocking stylesheet,
+	 * stylesheet 2 is any <style> elements */
+	c->data.html.stylesheet_content = xcalloc(STYLESHEET_START, sizeof(*c->data.html.stylesheet_content));
+	c->data.html.stylesheet_content[STYLESHEET_ADBLOCK] = 0;
+	c->data.html.stylesheet_content[STYLESHEET_STYLE] = 0;
+	c->data.html.stylesheet_count = STYLESHEET_START;
 
 	c->active = 0;
 
-	c->data.html.stylesheet_content[0] = fetchcache(
+	c->data.html.stylesheet_content[STYLESHEET_BASE] = fetchcache(
 #ifdef riscos
 			"file:/<NetSurf$Dir>/Resources/CSS",
 #else
 			"file:///home/james/Projects/netsurf/CSS",
 #endif
-			html_convert_css_callback, c, 0,
-			c->width, c->height, true, 0, 0, false);
-	assert(c->data.html.stylesheet_content[0]);
+			html_convert_css_callback, c,
+			(void *) STYLESHEET_BASE, c->width, c->height,
+			true, 0, 0, false);
+	assert(c->data.html.stylesheet_content[STYLESHEET_BASE]);
 	c->active++;
-	fetchcache_go(c->data.html.stylesheet_content[0], 0,
-			html_convert_css_callback, c, 0,
-			0, 0, false);
+	fetchcache_go(c->data.html.stylesheet_content[STYLESHEET_BASE], 0,
+			html_convert_css_callback, c,
+			(void *) STYLESHEET_BASE, 0, 0, false);
+
+	if (option_block_ads) {
+		c->data.html.stylesheet_content[STYLESHEET_ADBLOCK] = fetchcache(
+#ifdef riscos
+			"file:/<NetSurf$Dir>/Resources/AdBlock",
+#else
+			"file:///home/james/Projects/netsurf/AdBlock",
+#endif
+			html_convert_css_callback, c,
+			(void *) STYLESHEET_ADBLOCK, c->width,
+			c->height, true, 0, 0, false);
+		if (c->data.html.stylesheet_content[STYLESHEET_ADBLOCK]) {
+			c->active++;
+			fetchcache_go(c->data.html.stylesheet_content[STYLESHEET_ADBLOCK],
+				0, html_convert_css_callback, c,
+				(void *) STYLESHEET_ADBLOCK, 0, 0, false);
+		}
+	}
 
 	for (node = head == 0 ? 0 : head->children; node != 0; node = node->next) {
 		if (node->type != XML_ELEMENT_NODE)
@@ -438,15 +461,15 @@ void html_find_stylesheets(struct content *c, xmlNode *head)
 
 			/* create stylesheet */
 			LOG(("style element"));
-			if (c->data.html.stylesheet_content[1] == 0) {
+			if (c->data.html.stylesheet_content[STYLESHEET_STYLE] == 0) {
 				const char *params[] = { 0 };
-				c->data.html.stylesheet_content[1] =
+				c->data.html.stylesheet_content[STYLESHEET_STYLE] =
 						content_create(c->data.html.
 						base_url);
-				if (!c->data.html.stylesheet_content[1])
+				if (!c->data.html.stylesheet_content[STYLESHEET_STYLE])
 					return;
 				if (!content_set_type(c->data.html.
-						stylesheet_content[1],
+						stylesheet_content[STYLESHEET_STYLE],
 						CONTENT_CSS, "text/css",
 						params))
 					return;
@@ -457,7 +480,7 @@ void html_find_stylesheets(struct content *c, xmlNode *head)
 			for (node2 = node->children; node2 != 0; node2 = node2->next) {
 				data = xmlNodeGetContent(node2);
 				if (!content_process_data(c->data.html.
-						stylesheet_content[1],
+						stylesheet_content[STYLESHEET_STYLE],
 						data, strlen(data))) {
 					xmlFree(data);
 					return;
@@ -469,15 +492,15 @@ void html_find_stylesheets(struct content *c, xmlNode *head)
 
 	c->data.html.stylesheet_count = i;
 
-	if (c->data.html.stylesheet_content[1] != 0) {
-		if (css_convert(c->data.html.stylesheet_content[1], c->width,
+	if (c->data.html.stylesheet_content[STYLESHEET_STYLE] != 0) {
+		if (css_convert(c->data.html.stylesheet_content[STYLESHEET_STYLE], c->width,
 				c->height)) {
-			content_add_user(c->data.html.stylesheet_content[1],
+			content_add_user(c->data.html.stylesheet_content[STYLESHEET_STYLE],
 					html_convert_css_callback,
-					c, (void *) 1);
+					c, (void *) STYLESHEET_STYLE);
 		} else {
 			/* conversion failed */
-			c->data.html.stylesheet_content[1] = 0;
+			c->data.html.stylesheet_content[STYLESHEET_STYLE] = 0;
 		}
 	}
 
diff --git a/render/html.h b/render/html.h
index 4dc1ca2a4..bd876a902 100644
--- a/render/html.h
+++ b/render/html.h
@@ -26,6 +26,12 @@ struct content;
 struct object_params;
 struct imagemap;
 
+/* entries in stylesheet_content */
+#define STYLESHEET_BASE		0	/* base style sheet */
+#define STYLESHEET_ADBLOCK	1	/* adblocking stylesheet */
+#define STYLESHEET_STYLE	2	/* <style> elements (not cached) */
+#define STYLESHEET_START	3	/* start of document stylesheets */
+
 /** Data specific to CONTENT_HTML. */
 struct content_html_data {
 	htmlParserCtxt *parser;  /**< HTML parser context. */
@@ -41,8 +47,7 @@ struct content_html_data {
 
 	/** Number of entries in stylesheet_content. */
 	unsigned int stylesheet_count;
-	/** Stylesheets. Each may be 0. Stylesheet 0 is the base style sheet,
-	 * stylesheet 1 is any <style> elements (not cached). */
+	/** Stylesheets. Each may be 0. */
 	struct content **stylesheet_content;
 	struct css_style *style;  /**< Base style. */
 
diff --git a/riscos/save_complete.c b/riscos/save_complete.c
index 074a44fc2..fad990c20 100644
--- a/riscos/save_complete.c
+++ b/riscos/save_complete.c
@@ -101,8 +101,8 @@ bool save_complete_html(struct content *c, const char *path, bool index)
 	if (save_complete_list_check(c))
 		return true;
 
-	/* save stylesheets, ignoring the base sheet */
-	for (i = 1; i != c->data.html.stylesheet_count; i++) {
+	/* save stylesheets, ignoring the base and adblocking sheets */
+	for (i = STYLESHEET_STYLE; i != c->data.html.stylesheet_count; i++) {
 		struct content *css = c->data.html.stylesheet_content[i];
 		char *source;
 		int source_len;
@@ -120,7 +120,7 @@ bool save_complete_html(struct content *c, const char *path, bool index)
 		if (!save_imported_sheets(css, path))
 			return false;
 
-		if (i == 1)
+		if (i == STYLESHEET_STYLE)
 			continue; /* don't save <style> elements */
 
 		snprintf(spath, sizeof spath, "%s.%x", path,
-- 
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