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#ifndef PARSER_H
#define PARSER_H
#include <lexer.h>
#include "mp-equation.h"
#include "mp.h"
/* Operator Associativity. */
typedef enum
{
LEFT_ASSOCIATIVE,
RIGHT_ASSOCIATIVE
} Associativity;
/* Operator Precedence. */
typedef enum
{
P_Unknown = 0,
P_AddSubtract=1,
P_Multiply=2,
P_Mod=3,
P_Divide=4,
P_Not=5,
P_Root=6,
P_Function=7,
P_Boolean=8,
P_Percentage=9,
/* UnaryMinus and Power must have same precedence. */
P_UnaryMinus=10,
P_Power=10,
P_Factorial=11,
P_NumberVariable=12,
/* P_Depth should be always at the bottom. It stops node jumping off the current depth level. */
P_Depth
} Precedence;
/* ParseNode structure for parse tree. */
typedef struct parse_node
{
struct parse_node *parent;
struct parse_node *left, *right;
LexerToken *token;
guint precedence;
Associativity associativity;
void* value;
struct parser_state* state;
void* (*evaluate) (struct parse_node* self);
} ParseNode;
/* ParserState structure. Stores parser state. */
typedef struct parser_state
{
ParseNode *root;
ParseNode *right_most;
LexerState *lexer;
guint depth_level;
MPEquationOptions *options;
int error;
char *error_token;
MPNumber ret;
int (*variable_is_defined)(struct parser_state *state, const char *name);
int (*get_variable)(struct parser_state *state, const char *name, MPNumber *z);
void (*set_variable)(struct parser_state *state, const char *name, const MPNumber *x);
int (*function_is_defined)(struct parser_state *state, const char *name);
int (*get_function)(struct parser_state *state, const char *name, const MPNumber *x, MPNumber *z);
int (*convert)(struct parser_state *state, const MPNumber *x, const char *x_units, const char *z_units, MPNumber *z);
} ParserState;
/* Create ParserState object. */
ParserState* p_create_parser(const gchar*, MPEquationOptions*);
/* Destroy ParserState object. */
void p_destroy_parser(ParserState*);
/* Parse string from ParserState. */
guint p_parse(ParserState*);
#endif /* PARSER_H */
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