1 files changed, 55 insertions, 0 deletions

diff --git a/LuaSL/src/LuaSL_LSL_tree.h b/LuaSL/src/LuaSL_LSL_tree.h
new file mode 100644
index 0000000..6d89672
--- /dev/null
+++ b/LuaSL/src/LuaSL_LSL_tree.h
@@ -0,0 +1,55 @@
+/*
+ * Definition of the structure used to build the abstract syntax tree.
+ */
+#ifndef __EXPRESSION_H__
+#define __EXPRESSION_H__
+ 
+/**
+ * @brief The operation type
+ */
+typedef enum tagEOperationType
+{
+    eVALUE,
+    eMULTIPLY,
+    ePLUS
+}EOperationType;
+ 
+/**
+ * @brief The expression structure
+ */
+typedef struct tagSExpression
+{
+        EOperationType type;///< type of operation
+ 
+        int value;///< valid only when type is eVALUE
+        struct tagSExpression* left; ///< left side of the tree
+        struct tagSExpression* right;///< right side of the tree
+}SExpression;
+ 
+/**
+ * @brief It creates an identifier
+ * @param value The number value
+ * @return The expression or NULL in case of no memory
+ */
+SExpression* createNumber(int value);
+ 
+/**
+ * @brief It creates an operation
+ * @param type The operation type
+ * @param left The left operand
+ * @param right The right operand
+ * @return The expression or NULL in case of no memory
+ */
+SExpression* createOperation(
+                        EOperationType type,
+                        SExpression *left,
+                        SExpression *right);
+ 
+/**
+ * @brief Deletes a expression
+ * @param b The expression
+ */
+void deleteExpression(SExpression *b);
+ 
+#endif // __EXPRESSION_H__
+