1 files changed, 83 insertions, 0 deletions
diff --git a/fuzzylite/src/rule/Expression.cpp b/fuzzylite/src/rule/Expression.cpp
new file mode 100644
index 0000000..9b0ab81
--- /dev/null
+++ b/fuzzylite/src/rule/Expression.cpp
@@ -0,0 +1,83 @@
+/*
+ fuzzylite (R), a fuzzy logic control library in C++.
+ Copyright (C) 2010-2017 FuzzyLite Limited. All rights reserved.
+ Author: Juan Rada-Vilela, Ph.D. <jcrada@fuzzylite.com>
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the FuzzyLite License included with the software.
+
+ You should have received a copy of the FuzzyLite License along with
+ fuzzylite. If not, see <http://www.fuzzylite.com/license/>.
+
+ fuzzylite is a registered trademark of FuzzyLite Limited.
+ */
+
+#include "fl/rule/Expression.h"
+
+#include "fl/hedge/Hedge.h"
+#include "fl/term/Term.h"
+#include "fl/rule/Rule.h"
+#include "fl/variable/Variable.h"
+
+namespace fl {
+
+    Expression::Expression() { }
+
+    Expression::~Expression() { }
+
+    Proposition::Proposition() : Expression(),
+    variable(fl::null), term(fl::null) { }
+
+    Proposition::~Proposition() {
+        for (std::size_t i = 0; i < hedges.size(); ++i) {
+            delete hedges.at(i);
+        }
+        hedges.clear();
+    }
+
+    Expression::Type Proposition::type() const {
+        return Expression::Proposition;
+    }
+
+    std::string Proposition::toString() const {
+        std::ostringstream ss;
+        if (variable) {
+            ss << variable->getName();
+        } else {
+            ss << "?";
+        }
+        if (not hedges.empty()) {
+            ss << " " << Rule::isKeyword() << " ";
+            for (std::size_t i = 0; i < hedges.size(); ++i) {
+                ss << hedges.at(i)->name() << " ";
+            }
+        }
+
+        if (term) { //term is fl::null if hedge is any
+            if (hedges.empty()) {
+                ss << " " << Rule::isKeyword() << " ";
+            }
+            ss << term->getName();
+        }
+        return ss.str();
+    }
+
+    Operator::Operator() : Expression(),
+    name(""), left(fl::null), right(fl::null) { }
+
+    Operator::~Operator() {
+        if (left) delete left;
+        if (right) delete right;
+    }
+
+    Expression::Type Operator::type() const {
+        return Expression::Operator;
+    }
+
+    std::string Operator::toString() const {
+        return name;
+    }
+
+}