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/* Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "contrib/json.h"
#include "contrib/string.h"
#define MAX_DEPTH 8
enum {
BLOCK_INVALID = 0,
BLOCK_OBJECT,
BLOCK_LIST,
};
/*! One indented block of JSON. */
struct block {
/*! Block type. */
int type;
/*! Number of elements written. */
int count;
};
struct jsonw {
/*! Output file stream. */
FILE *out;
/*! Indentaiton string. */
const char *indent;
/*! List to be used as a stack of blocks in progress. */
struct block stack[MAX_DEPTH];
/*! Index pointing to the top of the stack. */
int top;
/*! Newline needed indication. */
bool wrap;
};
static const char *DEFAULT_INDENT = "\t";
static void start_block(jsonw_t *w, int type)
{
assert(w->top > 0);
struct block b = {
.type = type,
.count = 0,
};
w->top -= 1;
w->stack[w->top] = b;
}
static struct block *cur_block(jsonw_t *w)
{
if (w && w->top < MAX_DEPTH) {
return &w->stack[w->top];
}
return NULL;
}
/*! Insert new line and indent for the next write. */
static void wrap(jsonw_t *w)
{
if (!w->wrap) {
w->wrap = true;
return;
}
fputc('\n', w->out);
int level = MAX_DEPTH - w->top;
for (int i = 0; i < level; i++) {
fprintf(w->out, "%s", w->indent);
}
}
static void end_block(jsonw_t *w)
{
assert(w->top < MAX_DEPTH);
w->top += 1;
}
static void escaped_print(jsonw_t *w, const char *str)
{
fputc('"', w->out);
for (const char *pos = str; *pos != '\0'; pos++) {
char c = *pos;
if (c == '\\' || c == '\"') {
fputc('\\', w->out);
}
fputc(c, w->out);
}
fputc('"', w->out);
}
static void align_key(jsonw_t *w, const char *key)
{
struct block *top = cur_block(w);
if (top && top->count++) {
fputc(',', w->out);
}
wrap(w);
if (key && key[0]) {
escaped_print(w, key);
fprintf(w->out, ": ");
}
}
jsonw_t *jsonw_new(FILE *out, const char *indent)
{
assert(out);
jsonw_t *w = calloc(1, sizeof(*w));
if (w == NULL) {
return w;
}
w->out = out;
w->indent = indent ? indent : DEFAULT_INDENT;
w->top = MAX_DEPTH;
return w;
}
void jsonw_free(jsonw_t **w)
{
if (w == NULL) {
return;
}
wrap(*w);
free(*w);
*w = NULL;
}
void jsonw_object(jsonw_t *w, const char *key)
{
assert(w);
align_key(w, key);
fprintf(w->out, "{");
start_block(w, BLOCK_OBJECT);
}
void jsonw_list(jsonw_t *w, const char *key)
{
assert(w);
align_key(w, key);
fprintf(w->out, "[");
start_block(w, BLOCK_LIST);
}
void jsonw_str(jsonw_t *w, const char *key, const char *value)
{
assert(w);
align_key(w, key);
escaped_print(w, value);
}
void jsonw_ulong(jsonw_t *w, const char *key, unsigned long value)
{
assert(w);
align_key(w, key);
fprintf(w->out, "%lu", value);
}
void jsonw_int(jsonw_t *w, const char *key, int value)
{
assert(w);
align_key(w, key);
fprintf(w->out, "%d", value);
}
void jsonw_bool(jsonw_t *w, const char *key, bool value)
{
assert(w);
align_key(w, key);
fprintf(w->out, "%s", value ? "true" : "false");
}
void jsonw_hex(jsonw_t *w, const char *key, const uint8_t *data, size_t len)
{
assert(w);
char *hex = bin_to_hex(data, len, true);
if (hex != NULL) {
jsonw_str(w, key, hex);
}
free(hex);
}
void jsonw_end(jsonw_t *w)
{
assert(w);
struct block *top = cur_block(w);
if (top == NULL) {
return;
}
end_block(w);
wrap(w);
switch (top->type) {
case BLOCK_OBJECT:
fprintf(w->out, "}");
break;
case BLOCK_LIST:
fprintf(w->out, "]");
break;
}
}
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