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/* sax_stack.h
* Copyright (c) 2011, Peter Ohler
* All rights reserved.
*/
#ifndef OX_SAX_STACK_H
#define OX_SAX_STACK_H
#include <stdlib.h>
#include "intern.h"
#include "sax_hint.h"
#define STACK_INC 32
#define NV_BUF_MAX 64
typedef struct _nv {
char name_buf[NV_BUF_MAX];
const char *name;
VALUE val;
int childCnt;
Hint hint;
} *Nv;
typedef struct _nStack {
struct _nv base[STACK_INC];
Nv head; /* current stack */
Nv end; /* stack end */
Nv tail; /* pointer to one past last element name on stack */
} *NStack;
inline static void stack_init(NStack stack) {
stack->head = stack->base;
stack->end = stack->base + sizeof(stack->base) / sizeof(struct _nv);
stack->tail = stack->head;
}
inline static int stack_empty(NStack stack) {
return (stack->head == stack->tail);
}
inline static void stack_cleanup(NStack stack) {
if (stack->base != stack->head) {
xfree(stack->head);
}
}
inline static void stack_push(NStack stack, const char *name, size_t nlen, VALUE val, Hint hint) {
if (stack->end <= stack->tail) {
size_t len = stack->end - stack->head;
size_t toff = stack->tail - stack->head;
if (stack->base == stack->head) {
stack->head = ALLOC_N(struct _nv, len + STACK_INC);
memcpy(stack->head, stack->base, sizeof(struct _nv) * len);
} else {
REALLOC_N(stack->head, struct _nv, len + STACK_INC);
}
stack->tail = stack->head + toff;
stack->end = stack->head + len + STACK_INC;
}
if (NV_BUF_MAX <= nlen) {
stack->tail->name = ox_strndup(name, nlen);
} else {
strncpy(stack->tail->name_buf, name, nlen);
stack->tail->name_buf[nlen] = '\0';
stack->tail->name = NULL;
}
stack->tail->val = val;
stack->tail->hint = hint;
stack->tail->childCnt = 0;
stack->tail++;
}
inline static Nv stack_peek(NStack stack) {
if (stack->head < stack->tail) {
return stack->tail - 1;
}
return NULL;
}
inline static Nv stack_pop(NStack stack) {
if (stack->head < stack->tail) {
stack->tail--;
if (NULL != stack->tail->name) {
xfree((char *)(stack->tail->name));
}
return stack->tail;
}
return NULL;
}
inline static const char *nv_name(Nv nv) {
if (NULL == nv->name) {
return nv->name_buf;
}
return nv->name;
}
inline static int nv_same_name(Nv nv, const char *name, bool smart) {
if (smart) {
if (NULL == nv->name) {
return (0 == strcasecmp(name, nv->name_buf));
}
return (0 == strcasecmp(name, nv->name));
}
if (NULL == nv->name) {
return (0 == strcmp(name, nv->name_buf));
}
return (0 == strcmp(name, nv->name));
}
#endif /* OX_SAX_STACK_H */
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