expr.h

#ifndef PCEAS_EXPR_H
#define PCEAS_EXPR_H

/* value types */
#define T_DECIMAL	0
#define T_HEXA		1
#define T_BINARY	2
#define T_CHAR		3
#define T_SYMBOL	4
#define T_PC		5

/* operators */
#define OP_START 0
#define OP_OPEN	 1
#define OP_ADD	 2
#define OP_SUB	 3
#define OP_MUL	 4
#define OP_DIV	 5
#define OP_MOD	 6
#define OP_NEG	 7
#define OP_SHL	 8
#define OP_SHR	 9
#define OP_OR	10
#define OP_XOR	11
#define OP_AND	12
#define OP_COM	13
#define OP_NOT	14
#define OP_EQUAL		15
#define OP_NOT_EQUAL	16
#define OP_LOWER		17
#define OP_LOWER_EQUAL	18
#define OP_HIGHER		19
#define OP_HIGHER_EQUAL	20
#define OP_DEFINED	21
#define OP_HIGH		22
#define OP_LOW		23
#define OP_PAGE		24
#define OP_BANK		25
#define OP_VRAM		26
#define OP_PAL		27
#define OP_SIZEOF	28

unsigned int  op_stack[64] = { OP_START };	/* operator stack */
unsigned int val_stack[64];	/* value stack */
int op_idx, val_idx;	/* index in the operator and value stacks */
int need_operator;		/* when set await an operator, else await a value */
unsigned char *expr;	/* pointer to the expression string */
unsigned char *expr_stack[16];	/* expression stack */
struct t_symbol *expr_lablptr;	/* pointer to the lastest label */
int expr_lablcnt;		/* number of label seen in an expression */

#endif /* PCEAS_EXPR_H */