Demo/example/contrib of using tinyxml2 to generate confomant HTML5.

2013-10-11 16:48:55 -05:00 · 2013-10-11 16:48:55 -05:00 · 9460e5093c
parent 44ba601c5f
commit 9460e5093c
1 changed files with 87 additions and 0 deletions
--- a/contrib/html5-printer.cpp
+++ b/contrib/html5-printer.cpp
@ -0,0 +1,87 @@
+//	g++ -Wall -O2 contrib/html5-printer.cpp -o html5-printer -ltinyxml2
+
+//	This program demonstrates how to use "tinyxml2" to generate conformant HTML5
+//	by deriving from the "tinyxml2::XMLPrinter" class.
+
+//	http://dev.w3.org/html5/markup/syntax.html
+
+//	In HTML5, there are 16 so-called "void" elements.  "void elements" NEVER have
+//	inner content (but they MAY have attributes), and are assumed to be self-closing.
+//	An example of a self-closig HTML5 element is "<br/>" (line break)
+//	All other elements are called "non-void" and MUST never self-close.
+//	Examples: "<div class='lolcats'></div>".
+
+//	tinyxml2::XMLPrinter will emit _ALL_ XML elements with no inner content as
+//	self-closing.  This behavior produces space-effeceint XML, but incorrect HTML5.
+
+//	Author: Dennis Jenkins,  dennis (dot) jenkins (dot) 75 (at) gmail (dot) com.
+//	License: Same as tinyxml2 (zlib)
+//		This example is a small contribution to the world!  Enjoy it!
+
+
+#include <tinyxml2.h>
+#include <iostream>
+
+#if defined (_MSC_VER)
+#define strcasecmp stricmp
+#endif
+
+using namespace tinyxml2;
+
+// Contrived input containing a mix of void and non-void HTML5 elements.
+// When printed via XMLPrinter, some non-void elements will self-close (not valid HTML5).
+static const char input[] =
+"<html><body><p style='a'></p><br/>&copy;<col a='1' b='2'/><div a='1'></div></body></html>";
+
+// XMLPrinterHTML5 is small enough, just put the entire implementation inline.
+class	XMLPrinterHTML5 : public XMLPrinter
+{
+public:
+	XMLPrinterHTML5 (FILE* file=0, bool compact = false, int depth = 0) :
+		XMLPrinter (file, compact, depth)
+	{}
+
+protected:
+	virtual void CloseElement () {
+		if (_elementJustOpened && !isVoidElement (_stack.PeekTop())) {
+			SealElement();
+		}
+		XMLPrinter::CloseElement();
+	}
+
+	virtual bool isVoidElement (const char *name) {
+// Complete list of all HTML5 "void elements",
+// http://dev.w3.org/html5/markup/syntax.html
+		static const char *list[] = {
+			"area", "base", "br", "col", "command", "embed", "hr", "img",
+			"input", "keygen", "link", "meta", "param", "source", "track", "wbr",
+			NULL
+		};
+
+// I could use 'bsearch', but I don't have MSVC to test on (it would work with gcc/libc).
+		for (const char **p = list; *p; ++p) {
+			if (!strcasecmp (name, *p)) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+};
+
+int	main (void) {
+	XMLDocument doc (false);
+	doc.Parse (input);
+
+	std::cout << "INPUT:\n" << input << "\n\n";
+
+	XMLPrinter prn (NULL, true);
+	doc.Print (&prn);
+	std::cout << "XMLPrinter (not valid HTML5):\n" << prn.CStr() << "\n\n";
+
+	XMLPrinterHTML5 html5 (NULL, true);
+	doc.Print (&html5);
+	std::cout << "XMLPrinterHTML5:\n" << html5.CStr() << "\n";
+
+	return 0;
+}