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/*
* 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);
SExpression *getAST(const char *expr);
int evaluate(SExpression *e);
int yyerror(const char *msg);
int yyparse(void *param);
#endif // __EXPRESSION_H__
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