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authorKaren Arutyunov <karen@codesynthesis.com>2020-03-18 22:17:49 +0300
committerKaren Arutyunov <karen@codesynthesis.com>2020-03-27 17:28:44 +0300
commit35359f038f571dc46de3d14af72a2bc911fb0a24 (patch)
treede3e89d678e78b9efc4d395274fd7ccc68f4a213 /web/xhtml/fragment.cxx
parent8ad672cc7211952716ffe1fbf76c179b4f1149e3 (diff)
Implement brep-monitor
Diffstat (limited to 'web/xhtml/fragment.cxx')
-rw-r--r--web/xhtml/fragment.cxx143
1 files changed, 143 insertions, 0 deletions
diff --git a/web/xhtml/fragment.cxx b/web/xhtml/fragment.cxx
new file mode 100644
index 0000000..843db82
--- /dev/null
+++ b/web/xhtml/fragment.cxx
@@ -0,0 +1,143 @@
+// 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/serialization.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);
+ }
+ }
+ }
+ }
+}