Hash :
2cfb1381
Author :
Thomas de Grivel
Date :
2021-12-30T11:58:28
WIP parser
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/*
* kv - key value text file format
*
* Copyright 2022 Thomas de Grivel
*/
#include <assert.h>
#include <stdlib.h>
#include "kv.h"
int kv_is_space (int c)
{
switch (c) {
case ' ':
case '\n':
case '\r':
case '\t':
case '\v':
return 1;
default:
return 0;
}
return 0;
}
void kv_sp (s_buffer *b)
{
int c = buffer_peek(b);
while (kv_is_space(c)) {
buffer_read(b);
c = buffer_peek(b);
}
}
int kv_k (s_buffer *b, char **k, size_t *ksz)
{
(void) b;
(void) k;
(void) ksz;
return 0;
}
int kv_v (s_buffer *b, char **v, size_t *vsz, f_kv *f)
{
(void) b;
(void) v;
(void) vsz;
(void) f;
return 0;
}
int kv_m1 (s_buffer *b, f_kv *f)
{
char *k = NULL;
size_t ksz = 0;
size_t pos;
int r;
char *v = NULL;
size_t vsz = 0;
assert(b);
pos = b->pos;
kv_sp(b);
r = kv_k(b, &k, &ksz);
if (r < 0)
return r;
if (r) {
kv_sp(b);
r = buffer_eat(b, ":");
if (r < 0)
goto error;
kv_sp(b);
r = kv_v(b, &v, &vsz, f);
if (r < 0)
goto error;
if (r) {
if (f) {
b->k = kv_path_new(k, ksz, b->k);
if (!b->k)
exit(1);
r = f(b, v, vsz);
if (r < 0) {
buffer_err(b, "event callback returned %d", r);
r = -5;
goto error_kv;
}
}
kv_sp(b);
if (buffer_peek(b) == ',') {
buffer_read(b);
kv_sp(b);
}
free(k);
k = NULL;
free(v);
v = NULL;
return 1;
}
free(k);
k = NULL;
}
b->pos = pos;
return 0;
error_kv:
free(v);
error:
free(k);
return r;
}
int kv_m2 (s_buffer *b, f_kv *f)
{
size_t pos;
int r;
assert(b);
pos = b->pos;
kv_sp(b);
if (buffer_peek(b) == '{') {
buffer_read(b);
kv_m1(b, f);
r = buffer_eat(b, "}");
if (r < 0)
return r;
return 1;
}
b->pos = pos;
return 0;
}
int kv_parse (s_buffer *b, f_kv *f)
{
int c;
int r;
assert(b);
kv_sp(b);
c = buffer_peek(b);
if (c < 0) {
if (c == -1)
return 0;
return c;
}
r = kv_m2(b, f);
if (r < 0)
return r;
if (r) {
c = buffer_read(b);
if (c == -1)
return 0;
buffer_err(b, "expected EOF");
return -2;
}
r = kv_m1(b, f);
if (r < 0)
return r;
if (r) {
c = buffer_read(b);
if (c == -1)
return 0;
buffer_err(b, "expected EOF");
return -2;
}
return -2;
}