1 files changed, 76 insertions, 0 deletions
diff --git a/expression_base.cpp b/expression_base.cpp
new file mode 100644
index 0000000..534e4f4
--- /dev/null
+++ b/expression_base.cpp
@@ -0,0 +1,76 @@
+/* PIA - Lenguajes Modernos de Programación
+ * FACULTAD DE CIENCIAS FÍSICO MATEMÁTICAS
+ * Luis Sebastián Martínez Vega - LCC */
+
+#include <string>
+#include "include/expressions.hpp"
+#include "include/lexer.hpp"
+
+using std::string;
+
+Expression::Expression(Expression *left, Expression *right, token_type type)
+  : left(left), right(right), type(type) {}
+
+Expression::~Expression() {
+  delTree();
+}
+
+const Expression *Expression::getLeft() {
+  return left;
+}
+
+const Expression *Expression::getRight() {
+  return right;
+}
+
+string Expression::getRepr() {
+  if(repr.empty())
+    setRepr();
+
+  return repr;
+}
+
+void Expression::setRepr() {
+  repr += '(';
+
+  if(getLeft() != NULL)
+    repr += left->getRepr();
+
+  switch(type) {
+  case sum:
+    repr += '+';
+
+    break;
+  case substraction:
+    repr += '-';
+
+    break;
+  case multiplication:
+    repr += '*';
+
+    break;
+  case division:
+    repr += '/';
+    
+    break;
+  case power:
+    repr += '^';
+    
+    break;
+  }
+
+  if(getRight() != NULL)
+    repr += right->getRepr();
+
+  repr += ')';
+}
+
+void Expression::delTree() {
+  if(getLeft() != NULL)
+    delete left;
+
+  if(getRight() != NULL)
+    delete right;
+
+  delete this;
+}