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#include <stdlib.h>
#include <string.h>
#include "xml.h"
static char *gettag(char *xml, int *pos);
static char *getvalue(char *xml, int *pos);
static attr_t *getattrs(char *parsed, char **tag, int *n_attrs);
// TODO: make this smaller
// TODO: add attribute parsing
map_t *decode(char *xml, int *pos, int *len)
{
if (*len)
++(*len);
else
*len = 1;
map_t *decoded = calloc(1, sizeof(map_t));
int err = 0, closed = 1;
for (int i = *pos; i < strlen(xml); ++i) {
if (!strncmp(xml + i, "</", 2)) {
i += 2;
char *tmp = gettag(xml, &i);
if (!strcmp(decoded->tag, tmp))
*pos = i;
else
err = 1;
free(tmp);
goto end;
} else if (xml[i] == '<' && closed) {
++i;
decoded->attrs =
getattrs(gettag(xml, &i),
&(decoded->tag), &(decoded->n_attrs));
closed = 0;
} else if (xml[i] == '<' && !closed) {
map_t *ndec = decode(xml, &i, &(decoded->n));
decoded->size = sizeof(map_t);
if (decoded->n > 1)
decoded->payload = realloc(decoded->payload, decoded->n * sizeof(map_t));
else
decoded->payload = calloc(1, sizeof(map_t));
((map_t *) decoded->payload)[decoded->n - 1] = *ndec;
free(ndec);
} else {
decoded->payload = getvalue(xml, &i);
decoded->size = sizeof(char);
decoded->n = strlen(decoded->payload);
}
}
end:
if (err) {
free(decoded);
decoded = NULL;
}
return decoded;
}
static char *gettag(char *xml, int *pos)
{
int len, i;
for (i = *pos, len = 0; xml[i] != '>' && i < strlen(xml); ++i, ++len)
;
if (i >= strlen(xml))
return NULL;
char *title = calloc(len + 1, sizeof(char));
strncpy(title, xml + *pos, len);
*pos += len;
return title;
}
static char *getvalue(char *xml, int *pos)
{
int len, i;
for (i = *pos, len = 0; xml[i] != '<' && i < strlen(xml); ++i, ++len)
;
if (i >= strlen(xml))
return NULL;
char *value = calloc(len + 1, sizeof(char));
strncpy(value, xml + *pos, len);
*pos += len - 1;
return value;
}
static attr_t *getattrs(char *parsed, char **tag, int *n_attrs)
{
attr_t *attrs;
char *iter = strtok(parsed, " ");
*tag = calloc(strlen(iter) + 1, sizeof(char));
strcpy(*tag, iter);
if ((iter = strtok(NULL, " ")))
attrs = calloc((*n_attrs = 1), sizeof(attr_t));
else {
free(parsed);
return NULL;
}
int pos = 0;
do {
if (!iter)
break;
int i, len = strlen(iter);
for (i = 0; i < len && iter[i] != '='; ++i)
;
if (i >= len ||
(iter[i] == '=' && i >= len - 1) ||
(iter[i + 1] != '\'' && iter[i + 1] != '"')) {
free(parsed);
free(attrs);
return NULL;
}
char *name = calloc(i + 1, sizeof(char));
char *value = calloc(len - i, sizeof(char));
strncpy(name, iter, i);
strcpy(value, iter + i + 1);
memmove(value, value + 1, strlen(value) - 1);
value[strlen(value) - 2] = '\0';
if (pos >= *n_attrs)
attrs = realloc(attrs, (*n_attrs *= 2) * sizeof(attr_t));
attrs[pos].id = name;
attrs[pos++].value = value;
} while((iter = strtok(NULL, " ")));
*n_attrs = pos;
free(parsed);
return attrs;
}
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