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/*

 * 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 "json-lexer.h"

#include "json-parser.h"

#include "json-streamer.h"

#include "qjson.h"

#include "qint.h"

#include "qlist.h"

#include "qbool.h"

#include "qfloat.h"

#include "qdict.h"

typedef struct JSONParsingState

{

    JSONMessageParser parser;

    va_list *ap;

    QObject *result;

} JSONParsingState;

static void parse_json(JSONMessageParser *parser, QList *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 count;

    QString *str;

} ToJsonIterState;

static void to_json(const QObject *obj, QString *str);

static void to_json_dict_iter(const char *key, QObject *obj, void *opaque)

{

    ToJsonIterState *s = opaque;

    QString *qkey;

    if (s->count) {

        qstring_append(s->str, ", ");

    }

    qkey = qstring_from_str(key);

    to_json(QOBJECT(qkey), s->str);

    QDECREF(qkey);

    qstring_append(s->str, ": ");

    to_json(obj, s->str);

    s->count++;

}

static void to_json_list_iter(QObject *obj, void *opaque)

{

    ToJsonIterState *s = opaque;

    if (s->count) {

        qstring_append(s->str, ", ");

    }

    to_json(obj, s->str);

    s->count++;

}

static void to_json(const QObject *obj, QString *str)

{

    switch (qobject_type(obj)) {

    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;

        ptr = qstring_get_str(val);

        qstring_append(str, "\"");

        while (*ptr) {

            if ((ptr[0] & 0xE0) == 0xE0 &&

                (ptr[1] & 0x80) && (ptr[2] & 0x80)) {

                uint16_t wchar;

                char escape[7];

                wchar  = (ptr[0] & 0x0F) << 12;

                wchar |= (ptr[1] & 0x3F) << 6;

                wchar |= (ptr[2] & 0x3F);

                ptr += 2;

                snprintf(escape, sizeof(escape), "\\u%04X", wchar);

                qstring_append(str, escape);

            } else if ((ptr[0] & 0xE0) == 0xC0 && (ptr[1] & 0x80)) {

                uint16_t wchar;

                char escape[7];

                wchar  = (ptr[0] & 0x1F) << 6;

                wchar |= (ptr[1] & 0x3F);

                ptr++;

                snprintf(escape, sizeof(escape), "\\u%04X", wchar);

                qstring_append(str, escape);

            } else switch (ptr[0]) {

                case '\"':

                    qstring_append(str, "\\\"");

                    break;

                case '\\':

                    qstring_append(str, "\\\\");

                    break;

                case '\b':

                    qstring_append(str, "\\b");

                    break;

                case '\n':

                    qstring_append(str, "\\n");

                    break;

                case '\r':

                    qstring_append(str, "\\r");

                    break;

                case '\t':

                    qstring_append(str, "\\t");

                    break;

                default: {

                    if (ptr[0] <= 0x1F) {

                        char escape[7];

                        snprintf(escape, sizeof(escape), "\\u%04X", ptr[0]);

                        qstring_append(str, escape);

                    } else {

                        char buf[2] = { ptr[0], 0 };

                        qstring_append(str, buf);

                    }

                    break;

                }

                }

            ptr++;

        }

        qstring_append(str, "\"");

        break;

    }

    case QTYPE_QDICT: {

        ToJsonIterState s;

        QDict *val = qobject_to_qdict(obj);

        s.count = 0;

        s.str = str;

        qstring_append(str, "{");

        qdict_iter(val, to_json_dict_iter, &s);

        qstring_append(str, "}");

        break;

    }

    case QTYPE_QLIST: {

        ToJsonIterState s;

        QList *val = qobject_to_qlist(obj);

        s.count = 0;

        s.str = str;

        qstring_append(str, "[");

        qlist_iter(val, (void *)to_json_list_iter, &s);

        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_int(val)) {

            qstring_append(str, "true");

        } else {

            qstring_append(str, "false");

        }

        break;

    }

    case QTYPE_QERROR:

        /* XXX: should QError be emitted? */

    case QTYPE_NONE:

        break;

    }

}

QString *qobject_to_json(const QObject *obj)

{

    QString *str = qstring_new();

    to_json(obj, str);

    return str;

}