2 files changed, 97 insertions, 9 deletions
diff --git a/include/expressions.hpp b/include/expressions.hpp
new file mode 100644
index 0000000..5d8ed03
--- /dev/null
+++ b/include/expressions.hpp
@@ -0,0 +1,97 @@
+/* PIA - Lenguajes Modernos de Programación
+ * FACULTAD DE CIENCIAS FÍSICO MATEMÁTICAS
+ * Luis Sebastián Martínez Vega - LCC */
+
+#include <string>
+#ifndef EXPRESSIONS_H
+#define EXPRESSIONS_H
+
+enum trig_functions {
+  sin,
+  cos,
+  tan,
+  csc,
+  sec,
+  ctg
+};
+
+class Expression {
+private:
+  Expression *left;
+  Expression *right;
+  std::string repr;
+  void setRepr();
+  void delTree();
+public:
+  Expression(Expression *left, Expression *right);
+  virtual ~Expression() = 0;
+  std::string getRepr();
+  Expression *getLeft();
+  Expression *getRight();
+};
+
+class Literal : public Expression {
+private:
+  int value;
+public:
+  Literal();
+  ~Literal();
+  int getValue();
+};
+
+class Function : public Expression {
+private:
+  trig_functions function_name;
+public:
+  Function();
+  ~Function();
+  trig_functions getFunctionName();
+};
+
+class Variable : public Expression {
+private:
+  char name;
+public:
+  Variable();
+  ~Variable();
+  char getName();
+};
+
+class AddExpression : public Expression {
+public:
+  AddExpression();
+  ~AddExpression();
+};
+
+class SubExpression : public Expression {
+public:
+  SubExpression();
+  ~SubExpression();
+};
+
+class NegationExpression : public Expression {
+public:
+  NegationExpression();
+  ~NegationExpression();
+};
+
+class DivisionExpression : public Expression {
+public:
+  DivisionExpression();
+  ~DivisionExpression();
+};
+
+class MultiplicationExpression : public Expression {
+public:
+  MultiplicationExpression();
+  ~MultiplicationExpression();
+};
+
+class PowerExpression : public Expression {
+public:
+  PowerExpression();
+  ~PowerExpression();
+};
+
+
+#endif /* EXPRESSIONS_H */
diff --git a/include/lexer.hpp b/include/lexer.hpp
index 27779ea..39d8411 100644
--- a/include/lexer.hpp
+++ b/include/lexer.hpp
@@ -7,15 +7,6 @@
 #ifndef LEXER_H
 #define LEXER_H
 
-enum function_name{
-  sin,
-  cos,
-  tan,
-  csc,
-  sec,
-  ctg
-};
-
 enum token_type{
   sum,
   substraction,