Added support for Imply expression.

src/plasp/pddl/Expression.cpp

@@ -3,6 +3,7 @@
 #include <plasp/pddl/Context.h>
 #include <plasp/pddl/Identifier.h>
 #include <plasp/pddl/expressions/And.h>
+#include <plasp/pddl/expressions/Imply.h>
 #include <plasp/pddl/expressions/Not.h>
 #include <plasp/pddl/expressions/Or.h>
 #include <plasp/pddl/expressions/Predicate.h>
@@ -93,8 +94,9 @@ ExpressionPointer parseExpressionContent(const std::string &expressionIdentifier
 		expression = expressions::Or::parse(context, parameters, parseExpression);
 	else if (expressionIdentifier == "not")
 		expression = expressions::Not::parse(context, parameters, parseExpression);
-	else if (expressionIdentifier == "imply"
-		|| expressionIdentifier == "exists"
+	else if (expressionIdentifier == "imply")
+		expression = expressions::Imply::parse(context, parameters, parseExpression);
+	else if (expressionIdentifier == "exists"
 		|| expressionIdentifier == "forall"
 		|| expressionIdentifier == "-"
 		|| expressionIdentifier == "="

src/plasp/pddl/expressions/Binary.cpp

@@ -0,0 +1,38 @@
+#include <plasp/pddl/expressions/Binary.h>
+
+#include <algorithm>
+
+#include <plasp/pddl/Context.h>
+#include <plasp/pddl/ExpressionVisitor.h>
+#include <plasp/pddl/Identifier.h>
+
+namespace plasp
+{
+namespace pddl
+{
+namespace expressions
+{
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// Binary
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+const Expression *Binary::leftArgument() const
+{
+	return m_leftArgument.get();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+const Expression *Binary::rightArgument() const
+{
+	return m_rightArgument.get();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}
+}
+}

src/plasp/pddl/expressions/Imply.cpp

@@ -0,0 +1,27 @@
+#include <plasp/pddl/expressions/Imply.h>
+
+#include <plasp/pddl/ExpressionVisitor.h>
+
+namespace plasp
+{
+namespace pddl
+{
+namespace expressions
+{
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// Imply
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void Imply::accept(plasp::pddl::ExpressionVisitor &expressionVisitor) const
+{
+	expressionVisitor.visit(*this);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}
+}
+}