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// file : web/xhtml-fragment.cxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#include <web/xhtml-fragment.hxx>
#include <string>
#include <cassert>
#include <libstudxml/parser.hxx>
#include <libstudxml/serializer.hxx>
#include <web/xhtml.hxx>
using namespace std;
using namespace xml;
namespace web
{
namespace xhtml
{
fragment::
fragment (const string& text, const string& name, size_t length)
{
// To parse the fragment make it a valid xml document, wrapping with the
// root element. If requested, truncate the fragment before the
// first-level element when the content length limit is exceeded.
//
string doc ("<d>" + text + "</d>");
parser p (doc.c_str (),
doc.size (),
name,
parser::receive_elements |
parser::receive_characters |
parser::receive_attributes_event);
size_t len (0);
size_t level (0);
for (parser::event_type e: p)
{
switch (e)
{
case parser::start_element:
{
truncated = length != 0 && level == 1 && len >= length;
if (truncated)
break;
++level;
}
// Fall through.
case parser::start_attribute:
{
const auto& n (p.qname ());
if (!n.namespace_ ().empty ())
throw parsing (
name, p.line (), p.column (), "namespace is not allowed");
events_.emplace_back (e, n.name ());
break;
}
case parser::end_element:
{
--level;
}
// Fall through.
case parser::end_attribute:
{
events_.emplace_back (e, "");
break;
}
case parser::characters:
{
string& s (p.value ());
assert (!events_.empty ()); // Contains root element start.
if (events_.back ().first != parser::start_attribute)
len += s.size ();
events_.emplace_back (e, move (s));
break;
}
default:
assert (false);
}
if (truncated)
{
events_.emplace_back (parser::end_element, ""); // Close root.
break;
}
}
// Unwrap the fragment removing the root element events.
//
assert (events_.size () >= 2);
events_.erase (events_.begin ());
events_.pop_back ();
}
void fragment::
operator() (serializer& s) const
{
for (const auto& e: events_)
{
switch (e.first)
{
case parser::start_element:
{
s.start_element (xmlns, e.second);
break;
}
case parser::start_attribute:
{
s.start_attribute (e.second);
break;
}
case parser::end_element:
{
s.end_element ();
break;
}
case parser::end_attribute:
{
s.end_attribute ();
break;
}
case parser::characters:
{
s.characters (e.second);
break;
}
default:
assert (false);
}
}
}
}
}
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