1 files changed, 51 insertions, 0 deletions
diff --git a/gtk2_ardour/automation_time_axis.cc b/gtk2_ardour/automation_time_axis.cc
index def810f74e..7f70d3cd84 100644
--- a/gtk2_ardour/automation_time_axis.cc
+++ b/gtk2_ardour/automation_time_axis.cc
@@ -20,6 +20,8 @@
 #include <utility>
 #include <gtkmm2ext/barcontroller.h>
 #include <gtkmm2ext/utils.h>
+#include <boost/algorithm/string.hpp>
+#include <boost/lexical_cast.hpp>
 
 #include "pbd/memento_command.h"
 #include "pbd/stacktrace.h"
@@ -1024,3 +1026,52 @@ AutomationTimeAxisView::state_id() const
 				       (int) _parameter.channel());
 	}
 }
+
+/** Given a state id string, see if it is one generated by
+ *  this class.  If so, parse it into its components.
+ *  @param state_id State ID string to parse.
+ *  @param route_id Filled in with the route's ID if the state ID string is parsed.
+ *  @param has_parameter Filled in with true if the state ID has a parameter, otherwise false.
+ *  @param parameter Filled in with the state ID's parameter, if it has one.
+ *  @return true if this is a state ID generated by this class, otherwise false.
+ */
+
+bool
+AutomationTimeAxisView::parse_state_id (
+	string const & state_id,
+	PBD::ID & route_id,
+	bool & has_parameter,
+	Evoral::Parameter & parameter)
+{
+	stringstream s;
+	s << state_id;
+
+	string a, b, c;
+	s >> a >> b >> c;
+
+	if (a != X_("automation")) {
+		return false;
+	}
+
+	route_id = PBD::ID (b);
+
+	if (c.empty ()) {
+		has_parameter = false;
+		return true;
+	}
+
+	has_parameter = true;
+
+	vector<string> p;
+	boost::split (p, c, boost::is_any_of ("/"));
+
+	assert (p.size() == 3);
+
+	parameter = Evoral::Parameter (
+		boost::lexical_cast<int> (p[0]),
+		boost::lexical_cast<int> (p[2]),
+		boost::lexical_cast<int> (p[1])
+		);
+
+	return true;
+}