From 8f3d3956b1e837c726859eb8bbe19dad79c54a42 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Sat, 29 Apr 2017 23:55:46 +0300
Subject: Add hxx extension for headers and lib prefix for library dirs

---
 web/xhtml.hxx | 351 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 351 insertions(+)
 create mode 100644 web/xhtml.hxx

(limited to 'web/xhtml.hxx')

diff --git a/web/xhtml.hxx b/web/xhtml.hxx
new file mode 100644
index 0000000..0809860
--- /dev/null
+++ b/web/xhtml.hxx
@@ -0,0 +1,351 @@
+// file      : web/xhtml.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef WEB_XHTML_HXX
+#define WEB_XHTML_HXX
+
+#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
+  //   - user-defined literals: "a"_e, "/a"_e, "id"_a
+  //
+  // 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?
+  //
+  //
+  // * Element/attribute name clash problem (e.g., STYLE)
+  //
+  //   - some attribute/element name decorator (STYLEA, STYLE_A, STYLE_)
+  //   - rename attribute/element (e.g., STYLEDEF or CSSSTYLE[adds TYPE]);
+  //     in case of STYLE we should probably rename the element since
+  //     attribute will be much more frequently used.
+  //   - "scope" attributes inside elements (P::STYLE); somewhat
+  //     burdensome: P(P::STYLE); could then use low-case names
+  //     for attributes
+  //   - "scope" elements inside other elements (HEAD::STYLE); also
+  //     burdensome.
+  //
+  //
+  // * Text wrapping/indentation
+  //
+  // For some (inline) elements we want additional indentation:
+  //
+  // 1. Indent content on newline (e.g., for <style>).
+  // 2. Automatically wrap and indent lines at (or before) certain
+  //    length, say, 80 characters (e.g., for <p>).
+  //
+  // Would be nice to be able to implement this at the XHTML level,
+  // not XML.
+  //
+  namespace xhtml
+  {
+    const char* const xmlns = "http://www.w3.org/1999/xhtml";
+
+    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;
+
+    // End tag of an element (~P).
+    //
+    struct end_element
+    {
+      const element_base* e;
+
+      void
+      operator() (xml::serializer& s) const;
+    };
+
+    // Element without any conten (*BR).
+    //
+    struct empty_element
+    {
+      const element_base* e;
+
+      void
+      operator() (xml::serializer& s) const;
+    };
+
+    struct element_base
+    {
+      virtual void
+      start (xml::serializer& s) const = 0;
+
+      virtual void
+      end (xml::serializer& s) const = 0;
+
+      void          operator() (xml::serializer& s) const {start (s);}
+      end_element   operator~  () const {return end_element {this};}
+      empty_element operator*  () const {return empty_element {this};}
+    };
+
+    inline void end_element::
+    operator() (xml::serializer& s) const {e->end (s);}
+
+    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
+      start (xml::serializer& s) const {e->start (s); s << *a;}
+
+      virtual void
+      end (xml::serializer& s) const {e->end (s);}
+    };
+
+    struct element: element_base
+    {
+      const char* name;
+
+      explicit
+      element (const char* n): name (n) {}
+
+      virtual void
+      start (xml::serializer& s) const {s.start_element (xmlns, name);}
+
+      virtual void
+      end (xml::serializer& s) const {s.end_element (xmlns, name);}
+
+      // 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);
+      }
+
+      using element_base::operator();
+    };
+
+    struct inline_element: element
+    {
+      using element::element;
+
+      virtual void
+      start (xml::serializer& s) const
+      {
+        s.suspend_indentation ();
+        element::start (s);
+      }
+
+      virtual void
+      end (xml::serializer& s) const
+      {
+        element::end (s);
+        s.resume_indentation ();
+      }
+    };
+
+    struct attribute;
+    struct end_attribute
+    {
+      const attribute* a;
+
+      void
+      operator() (xml::serializer& s) const;
+    };
+
+    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;
+      //
+      virtual void
+      start (xml::serializer& s) const {s.start_attribute (name);};
+
+      virtual void
+      end (xml::serializer& s) const {s.end_attribute (name);}
+
+      void          operator() (xml::serializer& s) const {start (s);}
+      end_attribute operator~  () const {return end_attribute {this};}
+    };
+
+    inline void end_attribute::
+    operator() (xml::serializer& s) const {a->end (s);}
+
+    // 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 (): element ("html") {}
+
+      virtual void
+      start (xml::serializer& s) const
+      {
+        s.doctype_decl ("html");
+        s.start_element (xmlns, name);
+        s.namespace_decl (xmlns, "");
+      }
+    };
+    static const html_element HTML;
+
+    struct head_element: element
+    {
+      head_element (): element ("head") {}
+
+      virtual void
+      start (xml::serializer& s) const
+      {
+        s.start_element (xmlns, name);
+        s.start_element (xmlns, "meta");
+        s.attribute ("charset", "UTF-8");
+        s.end_element ();
+        s.start_element (xmlns, "meta");
+        s.attribute ("name", "viewport");
+        s.attribute ("content", "device-width, initial-scale=1");
+        s.end_element ();
+      }
+    };
+    static const head_element HEAD;
+
+    struct css_style_element: element
+    {
+      css_style_element (): element ("style") {}
+
+      virtual void
+      start (xml::serializer& s) const
+      {
+        s.start_element (xmlns, name);
+        s.attribute ("type", "text/css");
+      }
+    };
+    static const css_style_element CSS_STYLE;
+
+    static const element BODY   ("body");
+    static const element DIV    ("div");
+    static const element FORM   ("form");
+    static const element H1     ("h1");
+    static const element H2     ("h2");
+    static const element H3     ("h3");
+    static const element H4     ("h4");
+    static const element H5     ("h5");
+    static const element H6     ("h6");
+    static const element LI     ("li");
+    static const element LINK   ("link");
+    static const element META   ("meta");
+    static const element P      ("p");
+    static const element PRE    ("pre");
+    static const element SCRIPT ("script");
+    static const element TABLE  ("table");
+    static const element TBODY  ("tbody");
+    static const element TD     ("td");
+    static const element TH     ("th");
+    static const element TITLE  ("title");
+    static const element TR     ("tr");
+    static const element UL     ("ul");
+
+    static const inline_element A     ("a");
+    static const inline_element B     ("b");
+    static const inline_element BR    ("br");
+    static const inline_element CODE  ("code");
+    static const inline_element EM    ("em");
+    static const inline_element I     ("i");
+    static const inline_element INPUT ("input");
+    static const inline_element SPAN  ("span");
+    static const inline_element U     ("u");
+
+    // Attributes.
+    //
+
+    static const attribute AUTOFOCUS ("autofocus");
+    static const attribute CLASS     ("class");
+    static const attribute CONTENT   ("content");
+    static const attribute HREF      ("href");
+    static const attribute ID        ("id");
+    static const attribute NAME      ("name");
+    static const attribute REL       ("rel");
+    static const attribute STYLE     ("style");
+    static const attribute TYPE      ("type");
+    static const attribute VALUE     ("value");
+  }
+}
+
+#endif // WEB_XHTML_HXX
-- 
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