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+// file : web/xhtml -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef WEB_XHTML
+#define WEB_XHTML
+
+#include <xml/serializer>
+
+namespace web
+{
+ // "Canonical" XHTML5 vocabulary.
+ //
+ // One-letter tag names and local variable clash problem:
+ //
+ // a at|an|an anc anch
+ // b bt|bo|bl bld bold
+ // i it|it|it itl ital
+ // p pt|pr|pr par para
+ // q qt|qu|qt quo quot
+ // s st|st|st stk strk
+ // u ut|un|un unl undr
+ //
+ // Other options:
+ // - _a, a_, xa
+ // - A, I
+ // - x::i
+ //
+ // Things can actually get much worse, consider:
+ //
+ // int i;
+ // s << i << "text" << ~i;
+ //
+ // So perhaps this is the situation where the explicit namespace
+ // qualification (e.g., x::p) is the only robust option?
+ //
+ namespace xhtml
+ {
+ const char* xmlns = "http://www.w3.org/1999/xhtml";
+
+ using serializer_func = void (*) (xml::serializer&);
+
+ struct attr_value_base
+ {
+ const char* name;
+ mutable const attr_value_base* next;
+
+ virtual void
+ operator() (xml::serializer& s) const = 0;
+
+ protected:
+ explicit
+ attr_value_base (const char* n): name (n), next (nullptr) {}
+ };
+
+ template <typename T>
+ struct attr_value: attr_value_base
+ {
+ const T* val;
+
+ attr_value (const char* n, const T& v): attr_value_base (n), val (&v) {}
+
+ virtual void
+ operator() (xml::serializer& s) const
+ {
+ s.attribute (name, *val);
+ if (next != nullptr)
+ s << *next;
+ }
+ };
+
+ struct element_base;
+
+ // Element without any content, e.g., *BR.
+ //
+ struct empty_element
+ {
+ const element_base* e;
+
+ void
+ operator() (xml::serializer& s) const;
+ };
+
+ struct element_base
+ {
+ virtual void
+ operator() (xml::serializer& s) const = 0;
+
+ virtual serializer_func
+ operator~ () const = 0;
+
+ empty_element
+ operator* () const {return empty_element {this};}
+ };
+
+ inline void empty_element::
+ operator() (xml::serializer& s) const {s << *e << ~*e;}
+
+ // Element with an attribute chain, e.g., P(ID = 123, CLASS = "abc").
+ //
+ struct attr_element: element_base
+ {
+ const element_base* e;
+ const attr_value_base* a;
+
+ attr_element (const element_base& e, const attr_value_base& a)
+ : e (&e), a (&a) {}
+
+ virtual void
+ operator() (xml::serializer& s) const {s << *e << *a;}
+
+ virtual serializer_func
+ operator~ () const {return ~*e;}
+ };
+
+ struct element: element_base
+ {
+ const char* name;
+
+ explicit
+ element (const char* n): name (n) {}
+
+ virtual void
+ operator() (xml::serializer& s) const {s.start_element (xmlns, name);}
+
+ virtual serializer_func
+ operator~ () const {return [](xml::serializer& s) {s.end_element ();};}
+
+ // s << elem(attr1 = 123, attr2 = "abc");
+ //
+ template <typename T1>
+ attr_element
+ operator () (const attr_value<T1>& a1) const
+ {
+ return attr_element (*this, a1);
+ }
+
+ template <typename T1, typename... TN>
+ attr_element
+ operator () (const attr_value<T1>& a1, const attr_value<TN>&... an) const
+ {
+ a1.next = operator() (an...).a;
+ return attr_element (*this, a1);
+ }
+
+ protected:
+ element () = default;
+ };
+
+ struct inline_element: element
+ {
+ using element::element;
+ using element::operator();
+
+ virtual void
+ operator() (xml::serializer& s) const
+ {
+ s.suspend_indentation ();
+ element::operator() (s);
+ }
+
+ virtual serializer_func
+ operator~ () const
+ {
+ return [](xml::serializer& s)
+ {
+ s.end_element (); s.resume_indentation ();
+ };
+ }
+ };
+
+ struct attribute
+ {
+ const char* name;
+
+ explicit
+ attribute (const char* n): name (n) {}
+
+ // s << (attr1 = 123) << (attr2 = "abc");
+ //
+ template <typename T>
+ attr_value<T>
+ operator= (const T& v) const {return attr_value<T> (name, v);}
+
+ // s << attr1 (123) << attr2 ("abc");
+ //
+ template <typename T>
+ attr_value<T>
+ operator() (const T& v) const {return attr_value<T> (name, v);}
+
+ // s << attr1 << 123 << ~attr1 << attr2 << "abc" << ~attr2;
+ //
+ void
+ operator() (xml::serializer& s) const {s.start_attribute (name);}
+
+ virtual serializer_func
+ operator~ () const {return [](xml::serializer& s) {s.end_attribute ();};}
+ };
+
+ // Elements.
+ //
+ // Note that they are all declared static which means we may end
+ // up with multiple identical copies if this header get included
+ // into multiple translation units. The hope here is that the
+ // compiler will "see-through" and eliminate all of them.
+ //
+ struct html_element: element
+ {
+ html_element () {} // Uninitialized const static.
+
+ virtual void
+ operator() (xml::serializer& s) const
+ {
+ s.doctype_decl ("html");
+ s.start_element (xmlns, "html");
+ s.namespace_decl (xmlns, "");
+ }
+ };
+ static const html_element HTML;
+
+ struct head_element: element
+ {
+ head_element () {} // Uninitialized const static.
+
+ virtual void
+ operator() (xml::serializer& s) const
+ {
+ s.start_element (xmlns, "head");
+ s.start_element (xmlns, "meta");
+ s.attribute ("charset", "UTF-8");
+ s.end_element ();
+ }
+ };
+ static const head_element HEAD;
+
+ static const element TITLE ("title");
+ static const element BODY ("body");
+ static const element P ("p");
+
+ static const inline_element B ("b");
+ static const inline_element I ("i");
+ static const inline_element U ("u");
+
+ static const inline_element EM ("em");
+ static const inline_element BR ("br");
+
+ // Attributes.
+ //
+ static const attribute ID ("id");
+ static const attribute CLASS ("class");
+ static const attribute STYLE ("style");
+ }
+}
+
+#endif // WEB_XHTML