/*
 * 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__