Merge pull request #133 from dennisjenkins75/master

Small demo program to generate HTML5 via sub-classed tinyxml2::XMLPrinter
2013-10-16 13:59:10 -07:00 · 2013-10-16 13:59:10 -07:00 · 927fe73c5b
parent 44ba601c5f d31021392a
commit 927fe73c5b
1 changed files with 108 additions and 0 deletions
--- a/contrib/html5-printer.cpp
+++ b/contrib/html5-printer.cpp
@ -0,0 +1,108 @@
+//  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, see below)
+//  This example is a small contribution to the world!  Enjoy it!
+
+/*
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any
+damages arising from the use of this software.
+
+Permission is granted to anyone to use this software for any
+purpose, including commercial applications, and to alter it and
+redistribute it freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must
+not claim that you wrote the original software. If you use this
+software in a product, an acknowledgment in the product documentation
+would be appreciated but is not required.
+
+2. Altered source versions must be plainly marked as such, and
+must not be misrepresented as being the original software.
+
+3. This notice may not be removed or altered from any source
+distribution.
+*/
+
+
+#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;
+}