netsurf: add a parser from string wrapper

src/netsurf.zig

@@ -553,11 +553,17 @@ fn documentHTMLVtable(doc_html: *DocumentHTML) c.dom_html_document_vtable {
     return getVtable(c.dom_html_document_vtable, DocumentHTML, doc_html);
 }
 
-pub fn documentHTMLParse(filename: []const u8) *DocumentHTML {
-    var f: []u8 = @constCast(filename);
-    const doc = c.wr_create_doc_dom_from_file(f.ptr);
+pub fn documentHTMLParse(allocator: std.mem.Allocator, filename: []const u8) !*DocumentHTML {
+    var file = try std.fs.cwd().openFile(filename, .{});
+    defer file.close();
+
+    const file_size = try file.getEndPos();
+    const html = try file.readToEndAlloc(allocator, file_size);
+    defer allocator.free(html);
+
+    const doc = c.wr_create_doc_dom_from_string(html.ptr);
     if (doc == null) {
-        @panic("error parser");
+        return error.ParserError;
     }
     return @as(*DocumentHTML, @ptrCast(doc.?));
 }

vendor/netsurf/wrapper/wrapper.c

@@ -1,8 +1,58 @@
 #include <stdio.h>
+#include <string.h>
 
 #include <dom/dom.h>
 #include <dom/bindings/hubbub/parser.h>
 
+/**
+ * Generate a LibDOM document DOM from an HTML string
+ *
+ * \param string The HTML string
+ * \return  pointer to DOM document, or NULL on error
+ */
+dom_document *wr_create_doc_dom_from_string(char *html)
+{
+	dom_hubbub_parser *parser = NULL;
+	dom_hubbub_error error;
+	dom_hubbub_parser_params params;
+	dom_document *doc;
+
+	params.enc = NULL;
+	params.fix_enc = true;
+	params.enable_script = false;
+	params.msg = NULL;
+	params.script = NULL;
+	params.ctx = NULL;
+	params.daf = NULL;
+
+	/* Create Hubbub parser */
+	error = dom_hubbub_parser_create(&params, &parser, &doc);
+	if (error != DOM_HUBBUB_OK) {
+		printf("Can't create Hubbub Parser\n");
+		return NULL;
+	}
+
+	error = dom_hubbub_parser_parse_chunk(parser, html, strlen(html));
+	if (error != DOM_HUBBUB_OK) {
+		dom_hubbub_parser_destroy(parser);
+		printf("Parsing errors occur\n");
+		return NULL;
+	}
+
+	/* Done parsing file */
+	error = dom_hubbub_parser_completed(parser);
+	if (error != DOM_HUBBUB_OK) {
+		dom_hubbub_parser_destroy(parser);
+		printf("Parsing error when construct DOM\n");
+		return NULL;
+	}
+
+	/* Finished with parser */
+	dom_hubbub_parser_destroy(parser);
+
+	return doc;
+}
+
 /**
  * Generate a LibDOM document DOM from an HTML file
  *

vendor/netsurf/wrapper/wrapper.h

@@ -3,6 +3,7 @@
 
 #include <dom/dom.h>
 
+dom_document *wr_create_doc_dom_from_string(char *html);
 dom_document *wr_create_doc_dom_from_file(char *filename);
 
 #endif	/* wrapper_dom_h_ */