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/*
Author: José Bollo <jobol@nonadev.net>
https://gitlab.com/jobol/mustach
SPDX-License-Identifier: ISC
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "mustach.h"
#include "mustach-wrap.h"
#include "mustach-cjson.h"
struct expl {
cJSON null;
cJSON *root;
cJSON *selection;
int depth;
struct {
cJSON *cont;
cJSON *obj;
cJSON *next;
int is_objiter;
} stack[MUSTACH_MAX_DEPTH];
};
static int start(void *closure)
{
struct expl *e = closure;
e->depth = 0;
memset(&e->null, 0, sizeof e->null);
e->null.type = cJSON_NULL;
e->selection = &e->null;
e->stack[0].cont = NULL;
e->stack[0].obj = e->root;
return MUSTACH_OK;
}
static int compare(void *closure, const char *value)
{
struct expl *e = closure;
cJSON *o = e->selection;
double d;
if (cJSON_IsNumber(o)) {
d = o->valuedouble - atof(value);
return d < 0 ? -1 : d > 0 ? 1 : 0;
} else if (cJSON_IsString(o)) {
return strcmp(o->valuestring, value);
} else if (cJSON_IsTrue(o)) {
return strcmp("true", value);
} else if (cJSON_IsFalse(o)) {
return strcmp("false", value);
} else if (cJSON_IsNull(o)) {
return strcmp("null", value);
} else {
return 1;
}
}
static int sel(void *closure, const char *name)
{
struct expl *e = closure;
cJSON *o;
int i, r;
if (name == NULL) {
o = e->stack[e->depth].obj;
r = 1;
} else {
i = e->depth;
while (i >= 0 && !(o = cJSON_GetObjectItemCaseSensitive(e->stack[i].obj, name)))
i--;
if (i >= 0)
r = 1;
else {
o = &e->null;
r = 0;
}
}
e->selection = o;
return r;
}
static int subsel(void *closure, const char *name)
{
struct expl *e = closure;
cJSON *o;
int r;
o = cJSON_GetObjectItemCaseSensitive(e->selection, name);
r = o != NULL;
if (r)
e->selection = o;
return r;
}
static int enter(void *closure, int objiter)
{
struct expl *e = closure;
cJSON *o;
if (++e->depth >= MUSTACH_MAX_DEPTH)
return MUSTACH_ERROR_TOO_DEEP;
o = e->selection;
e->stack[e->depth].is_objiter = 0;
if (objiter) {
if (! cJSON_IsObject(o))
goto not_entering;
if (o->child == NULL)
goto not_entering;
e->stack[e->depth].obj = o->child;
e->stack[e->depth].next = o->child->next;
e->stack[e->depth].cont = o;
e->stack[e->depth].is_objiter = 1;
} else if (cJSON_IsArray(o)) {
if (o->child == NULL)
goto not_entering;
e->stack[e->depth].obj = o->child;
e->stack[e->depth].next = o->child->next;
e->stack[e->depth].cont = o;
} else if ((cJSON_IsObject(o) && o->child == NULL) || (! cJSON_IsFalse(o) && ! cJSON_IsNull(o))) {
e->stack[e->depth].obj = o;
e->stack[e->depth].cont = NULL;
e->stack[e->depth].next = NULL;
} else
goto not_entering;
return 1;
not_entering:
e->depth--;
return 0;
}
static int next(void *closure)
{
struct expl *e = closure;
cJSON *o;
if (e->depth <= 0)
return MUSTACH_ERROR_CLOSING;
o = e->stack[e->depth].next;
if (o == NULL)
return 0;
e->stack[e->depth].obj = o;
e->stack[e->depth].next = o->next;
return 1;
}
static int leave(void *closure)
{
struct expl *e = closure;
if (e->depth <= 0)
return MUSTACH_ERROR_CLOSING;
e->depth--;
return 0;
}
static int get(void *closure, struct mustach_sbuf *sbuf, int key)
{
struct expl *e = closure;
const char *s;
if (key) {
s = e->stack[e->depth].is_objiter
? e->stack[e->depth].obj->string
: "";
}
else if (cJSON_IsString(e->selection))
s = e->selection->valuestring;
else if (cJSON_IsNull(e->selection))
s = "";
else {
s = cJSON_PrintUnformatted(e->selection);
if (s == NULL)
return MUSTACH_ERROR_SYSTEM;
sbuf->freecb = cJSON_free;
}
sbuf->value = s;
return 1;
}
const struct mustach_wrap_itf mustach_cJSON_wrap_itf = {
.start = start,
.stop = NULL,
.compare = compare,
.sel = sel,
.subsel = subsel,
.enter = enter,
.next = next,
.leave = leave,
.get = get
};
int mustach_cJSON_file(const char *template, size_t length, cJSON *root, int flags, FILE *file)
{
struct expl e;
e.root = root;
return mustach_wrap_file(template, length, &mustach_cJSON_wrap_itf, &e, flags, file);
}
int mustach_cJSON_fd(const char *template, size_t length, cJSON *root, int flags, int fd)
{
struct expl e;
e.root = root;
return mustach_wrap_fd(template, length, &mustach_cJSON_wrap_itf, &e, flags, fd);
}
int mustach_cJSON_mem(const char *template, size_t length, cJSON *root, int flags, char **result, size_t *size)
{
struct expl e;
e.root = root;
return mustach_wrap_mem(template, length, &mustach_cJSON_wrap_itf, &e, flags, result, size);
}
int mustach_cJSON_write(const char *template, size_t length, cJSON *root, int flags, mustach_write_cb_t *writecb, void *closure)
{
struct expl e;
e.root = root;
return mustach_wrap_write(template, length, &mustach_cJSON_wrap_itf, &e, flags, writecb, closure);
}
int mustach_cJSON_emit(const char *template, size_t length, cJSON *root, int flags, mustach_emit_cb_t *emitcb, void *closure)
{
struct expl e;
e.root = root;
return mustach_wrap_emit(template, length, &mustach_cJSON_wrap_itf, &e, flags, emitcb, closure);
}
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