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/* Type for adding whitespace. */
typedef struct json_s {
SV * sv;
char * s;
STRLEN sl;
}
json_s_t;
typedef struct json_ws {
SV * news;
SV * olds;
/* Length of original string. */
STRLEN olds_l;
/* Length of new string. */
unsigned int news_l;
/* Copy point. */
char * q;
/* Origin */
char * p;
/* Top of token tree. */
json_token_t * t;
/* Token under examination now. */
json_token_t * next;
/* Whitespace to add before and after. */
char * before[n_json_tokens];
char * after[n_json_tokens];
int array_depth;
int object_depth;
char * array_indent;
char * object_indent;
}
json_ws_t;
static void copy_whitespace (json_ws_t * ws, char * w)
{
char * q;
q = ws->q;
while (*w) {
*q++ = *w++;
}
ws->q = q;
}
static INLINE int whitespace_json (json_ws_t * ws)
{
/* Copy place. */
char * c;
/* Value of q at entry to this routine, used to calculate added
length. */
char * qorig;
json_token_t * next;
char * q;
q = ws->q;
qorig = q;
next = ws->next;
while (next) {
/* Copy start of string. */
copy_whitespace (ws, ws->before[next->type]);
switch (next->type) {
case json_token_object:
*q++ = '{';
ws->object_depth++;
ws->q = q;
q += whitespace_json (ws);
ws->object_depth--;
*q++ = '}';
break;
case json_token_array:
*q++ = '[';
ws->array_depth++;
ws->q = q;
q += whitespace_json (ws);
ws->object_depth--;
*q++ = ']';
break;
case json_token_string:
case json_token_key:
case json_token_literal:
case json_token_number:
for (c = ws->p + next->start; c <= ws->p + next->end; c++) {
*q++ = *c;
}
break;
case json_token_comma:
*q++ = ',';
break;
case json_token_colon:
*q++ = ':';
break;
default:
croak ("unhandled token type %d", next->type);
}
/* Copy end of string. */
c = ws->after[next->type];
while (*c) {
*q++ = *c++;
}
next = next->next;
}
return q - qorig;
}
static int copy_json (char * p, char * q, json_token_t * t)
{
/* Loop variable. */
json_token_t * next;
/* Copy place. */
char * c;
/* Value of q at entry to this routine, used to calculate added
length. */
char * qorig;
next = t;
qorig = q;
while (next) {
switch (next->type) {
case json_token_object:
*q++ = '{';
q += copy_json (p, q, next->child);
*q++ = '}';
break;
case json_token_array:
*q++ = '[';
q += copy_json (p, q, next->child);
*q++ = ']';
break;
case json_token_string:
case json_token_key:
case json_token_literal:
case json_token_number:
for (c = p + next->start; c < p + next->end; c++) {
*q++ = *c;
}
break;
case json_token_comma:
*q++ = ',';
break;
case json_token_colon:
*q++ = ':';
break;
default:
croak ("unhandled token type %d", next->type);
}
next = next->next;
}
return q - qorig;
}
/* Remove all the whitespace. */
static SV * strip_whitespace (json_token_t * tokens, SV * json)
{
SV * stripped;
char * p;
char * q;
/* Original length. */
STRLEN l;
/* Length of output. */
unsigned int m;
p = SvPV (json, l);
stripped = newSV (l);
/* Tell Perl it's a string. */
SvPOK_on (stripped);
/* Set UTF-8 if necessary. */
if (SvUTF8 (json)) {
SvUTF8_on (stripped);
}
/* Get a pointer to the string inside "stripped". */
q = SvPVX (stripped);
m = copy_json (p, q, tokens);
/* Set the length. */
SvCUR_set (stripped, m);
return stripped;
}
static SV * indent (json_token_t * tokens, SV * json)
{
int i;
json_ws_t j = {0};
j.olds = json;
j.p = SvPV (j.olds, j.olds_l);
j.t = tokens;
j.next = tokens;
for (i = 0; i < n_json_tokens; i++) {
j.before[i] = "";
j.after[i] = "";
}
j.after[json_token_comma] = "\n";
j.after[json_token_object] = "\n";
j.after[json_token_array] = "\n";
return &PL_sv_undef;
}
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