qemu/qobject/qjson.c
Paolo Bonzini 95385fe9ac qjson: store tokens in a GQueue
Even though we still have the "streamer" concept, the tokens can now
be deleted as they are read.  While doing so convert from QList to
GQueue, since the next step will make tokens not a QObject and we
will have to do the conversion anyway.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1448300659-23559-4-git-send-email-pbonzini@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
2015-11-26 10:07:07 +01:00

286 lines
6.9 KiB
C

/*
* QObject JSON integration
*
* Copyright IBM, Corp. 2009
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#include "qapi/qmp/json-lexer.h"
#include "qapi/qmp/json-parser.h"
#include "qapi/qmp/json-streamer.h"
#include "qapi/qmp/qjson.h"
#include "qapi/qmp/qint.h"
#include "qapi/qmp/qlist.h"
#include "qapi/qmp/qbool.h"
#include "qapi/qmp/qfloat.h"
#include "qapi/qmp/qdict.h"
typedef struct JSONParsingState
{
JSONMessageParser parser;
va_list *ap;
QObject *result;
} JSONParsingState;
static void parse_json(JSONMessageParser *parser, GQueue *tokens)
{
JSONParsingState *s = container_of(parser, JSONParsingState, parser);
s->result = json_parser_parse(tokens, s->ap);
}
QObject *qobject_from_jsonv(const char *string, va_list *ap)
{
JSONParsingState state = {};
state.ap = ap;
json_message_parser_init(&state.parser, parse_json);
json_message_parser_feed(&state.parser, string, strlen(string));
json_message_parser_flush(&state.parser);
json_message_parser_destroy(&state.parser);
return state.result;
}
QObject *qobject_from_json(const char *string)
{
return qobject_from_jsonv(string, NULL);
}
/*
* IMPORTANT: This function aborts on error, thus it must not
* be used with untrusted arguments.
*/
QObject *qobject_from_jsonf(const char *string, ...)
{
QObject *obj;
va_list ap;
va_start(ap, string);
obj = qobject_from_jsonv(string, &ap);
va_end(ap);
assert(obj != NULL);
return obj;
}
typedef struct ToJsonIterState
{
int indent;
int pretty;
int count;
QString *str;
} ToJsonIterState;
static void to_json(const QObject *obj, QString *str, int pretty, int indent);
static void to_json_dict_iter(const char *key, QObject *obj, void *opaque)
{
ToJsonIterState *s = opaque;
QString *qkey;
int j;
if (s->count) {
qstring_append(s->str, s->pretty ? "," : ", ");
}
if (s->pretty) {
qstring_append(s->str, "\n");
for (j = 0 ; j < s->indent ; j++)
qstring_append(s->str, " ");
}
qkey = qstring_from_str(key);
to_json(QOBJECT(qkey), s->str, s->pretty, s->indent);
QDECREF(qkey);
qstring_append(s->str, ": ");
to_json(obj, s->str, s->pretty, s->indent);
s->count++;
}
static void to_json_list_iter(QObject *obj, void *opaque)
{
ToJsonIterState *s = opaque;
int j;
if (s->count) {
qstring_append(s->str, s->pretty ? "," : ", ");
}
if (s->pretty) {
qstring_append(s->str, "\n");
for (j = 0 ; j < s->indent ; j++)
qstring_append(s->str, " ");
}
to_json(obj, s->str, s->pretty, s->indent);
s->count++;
}
static void to_json(const QObject *obj, QString *str, int pretty, int indent)
{
switch (qobject_type(obj)) {
case QTYPE_QNULL:
qstring_append(str, "null");
break;
case QTYPE_QINT: {
QInt *val = qobject_to_qint(obj);
char buffer[1024];
snprintf(buffer, sizeof(buffer), "%" PRId64, qint_get_int(val));
qstring_append(str, buffer);
break;
}
case QTYPE_QSTRING: {
QString *val = qobject_to_qstring(obj);
const char *ptr;
int cp;
char buf[16];
char *end;
ptr = qstring_get_str(val);
qstring_append(str, "\"");
for (; *ptr; ptr = end) {
cp = mod_utf8_codepoint(ptr, 6, &end);
switch (cp) {
case '\"':
qstring_append(str, "\\\"");
break;
case '\\':
qstring_append(str, "\\\\");
break;
case '\b':
qstring_append(str, "\\b");
break;
case '\f':
qstring_append(str, "\\f");
break;
case '\n':
qstring_append(str, "\\n");
break;
case '\r':
qstring_append(str, "\\r");
break;
case '\t':
qstring_append(str, "\\t");
break;
default:
if (cp < 0) {
cp = 0xFFFD; /* replacement character */
}
if (cp > 0xFFFF) {
/* beyond BMP; need a surrogate pair */
snprintf(buf, sizeof(buf), "\\u%04X\\u%04X",
0xD800 + ((cp - 0x10000) >> 10),
0xDC00 + ((cp - 0x10000) & 0x3FF));
} else if (cp < 0x20 || cp >= 0x7F) {
snprintf(buf, sizeof(buf), "\\u%04X", cp);
} else {
buf[0] = cp;
buf[1] = 0;
}
qstring_append(str, buf);
}
};
qstring_append(str, "\"");
break;
}
case QTYPE_QDICT: {
ToJsonIterState s;
QDict *val = qobject_to_qdict(obj);
s.count = 0;
s.str = str;
s.indent = indent + 1;
s.pretty = pretty;
qstring_append(str, "{");
qdict_iter(val, to_json_dict_iter, &s);
if (pretty) {
int j;
qstring_append(str, "\n");
for (j = 0 ; j < indent ; j++)
qstring_append(str, " ");
}
qstring_append(str, "}");
break;
}
case QTYPE_QLIST: {
ToJsonIterState s;
QList *val = qobject_to_qlist(obj);
s.count = 0;
s.str = str;
s.indent = indent + 1;
s.pretty = pretty;
qstring_append(str, "[");
qlist_iter(val, (void *)to_json_list_iter, &s);
if (pretty) {
int j;
qstring_append(str, "\n");
for (j = 0 ; j < indent ; j++)
qstring_append(str, " ");
}
qstring_append(str, "]");
break;
}
case QTYPE_QFLOAT: {
QFloat *val = qobject_to_qfloat(obj);
char buffer[1024];
int len;
len = snprintf(buffer, sizeof(buffer), "%f", qfloat_get_double(val));
while (len > 0 && buffer[len - 1] == '0') {
len--;
}
if (len && buffer[len - 1] == '.') {
buffer[len - 1] = 0;
} else {
buffer[len] = 0;
}
qstring_append(str, buffer);
break;
}
case QTYPE_QBOOL: {
QBool *val = qobject_to_qbool(obj);
if (qbool_get_bool(val)) {
qstring_append(str, "true");
} else {
qstring_append(str, "false");
}
break;
}
default:
abort();
}
}
QString *qobject_to_json(const QObject *obj)
{
QString *str = qstring_new();
to_json(obj, str, 0, 0);
return str;
}
QString *qobject_to_json_pretty(const QObject *obj)
{
QString *str = qstring_new();
to_json(obj, str, 1, 0);
return str;
}