abCalc/abCalcExpr.c
2013-07-24 09:30:44 -05:00

62 lines
1.2 KiB
C

/*
abCalcExpr.c
By: Jeremy Rand
*/
#include <stdlib.h>
#include "abCalcExpr.h"
static abCalcExprCallbacks *gCallbacks[abCalcExprTypeMax];
#define AB_CALC_EXPR_TYPE_INVALID(type) (((type) < abCalcExprTypeMin) || ((type) >= abCalcExprTypeMax))
void abCalcExprInit(void)
{
abCalcExprType type;
for (type = abCalcExprTypeMin; type < abCalcExprTypeMax; type++) {
gCallbacks[type] = NULL;
}
}
void abCalcRegisterExprType(abCalcExprType type, abCalcExprCallbacks *callbacks)
{
if (AB_CALC_EXPR_TYPE_INVALID(type))
return;
gCallbacks[type] = callbacks;
}
abCalcExpr *abCalcParseExpr(abCalcExpr *expr, char *buffer)
{
abCalcExpr *result = NULL;
abCalcExprType type;
for (type = abCalcExprTypeMin; type < abCalcExprTypeMax; type++) {
if (gCallbacks[type] != NULL) {
result = (gCallbacks[type]->parseExpr)(expr, buffer);
if (result != NULL)
return result;
}
}
return result;
}
char *abCalcFormatExpr(abCalcExpr *expr, char *buffer)
{
if (AB_CALC_EXPR_TYPE_INVALID(expr->type))
return NULL;
if (gCallbacks[expr->type] == NULL)
return NULL;
return (gCallbacks[expr->type]->formatExpr(expr, buffer));
}