[qemu.git] / json-parser.c

/*
 * JSON Parser 
 *
 * Copyright IBM, Corp. 2009
 *
 * Authors:
 *  Anthony Liguori   <[email protected]>
 *
 * 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 <stdbool.h>

#include "qemu-common.h"
#include "qstring.h"
#include "qint.h"
#include "qdict.h"
#include "qlist.h"
#include "qfloat.h"
#include "qbool.h"
#include "json-parser.h"
#include "json-lexer.h"

typedef struct JSONParserContext
{
} JSONParserContext;

#define BUG_ON(cond) assert(!(cond))

/**
 * TODO
 *
 * 0) make errors meaningful again
 * 1) add geometry information to tokens
 * 3) should we return a parsed size?
 * 4) deal with premature EOI
 */

static QObject *parse_value(JSONParserContext *ctxt, QList **tokens, va_list *ap);

/**
 * Token manipulators
 *
 * tokens are dictionaries that contain a type, a string value, and geometry information
 * about a token identified by the lexer.  These are routines that make working with
 * these objects a bit easier.
 */
static const char *token_get_value(QObject *obj)
{
    return qdict_get_str(qobject_to_qdict(obj), "token");
}

static JSONTokenType token_get_type(QObject *obj)
{
    return qdict_get_int(qobject_to_qdict(obj), "type");
}

static int token_is_operator(QObject *obj, char op)
{
    const char *val;

    if (token_get_type(obj) != JSON_OPERATOR) {
        return 0;
    }

    val = token_get_value(obj);

    return (val[0] == op) && (val[1] == 0);
}

static int token_is_keyword(QObject *obj, const char *value)
{
    if (token_get_type(obj) != JSON_KEYWORD) {
        return 0;
    }

    return strcmp(token_get_value(obj), value) == 0;
}

static int token_is_escape(QObject *obj, const char *value)
{
    if (token_get_type(obj) != JSON_ESCAPE) {
        return 0;
    }

    return (strcmp(token_get_value(obj), value) == 0);
}

/**
 * Error handler
 */
static void parse_error(JSONParserContext *ctxt, QObject *token, const char *msg, ...)
{
    fprintf(stderr, "parse error: %s\n", msg);
}

/**
 * String helpers
 *
 * These helpers are used to unescape strings.
 */
static void wchar_to_utf8(uint16_t wchar, char *buffer, size_t buffer_length)
{
    if (wchar <= 0x007F) {
        BUG_ON(buffer_length < 2);

        buffer[0] = wchar & 0x7F;
        buffer[1] = 0;
    } else if (wchar <= 0x07FF) {
        BUG_ON(buffer_length < 3);

        buffer[0] = 0xC0 | ((wchar >> 6) & 0x1F);
        buffer[1] = 0x80 | (wchar & 0x3F);
        buffer[2] = 0;
    } else {
        BUG_ON(buffer_length < 4);

        buffer[0] = 0xE0 | ((wchar >> 12) & 0x0F);
        buffer[1] = 0x80 | ((wchar >> 6) & 0x3F);
        buffer[2] = 0x80 | (wchar & 0x3F);
        buffer[3] = 0;
    }
}

static int hex2decimal(char ch)
{
    if (ch >= '0' && ch <= '9') {
        return (ch - '0');
    } else if (ch >= 'a' && ch <= 'f') {
        return 10 + (ch - 'a');
    } else if (ch >= 'A' && ch <= 'F') {
        return 10 + (ch - 'A');
    }

    return -1;
}

/**
 * parse_string(): Parse a json string and return a QObject
 *
 *  string
 *      ""
 *      " chars "
 *  chars
 *      char
 *      char chars
 *  char
 *      any-Unicode-character-
 *          except-"-or-\-or-
 *          control-character
 *      \"
 *      \\
 *      \/
 *      \b
 *      \f
 *      \n
 *      \r
 *      \t
 *      \u four-hex-digits 
 */
static QString *qstring_from_escaped_str(JSONParserContext *ctxt, QObject *token)
{
    const char *ptr = token_get_value(token);
    QString *str;
    int double_quote = 1;

    if (*ptr == '"') {
        double_quote = 1;
    } else {
        double_quote = 0;
    }
    ptr++;

    str = qstring_new();
    while (*ptr && 
           ((double_quote && *ptr != '"') || (!double_quote && *ptr != '\''))) {
        if (*ptr == '\\') {
            ptr++;

            switch (*ptr) {
            case '"':
                qstring_append(str, "\"");
                ptr++;
                break;
            case '\'':
                qstring_append(str, "'");
                ptr++;
                break;
            case '\\':
                qstring_append(str, "\\");
                ptr++;
                break;
            case '/':
                qstring_append(str, "/");
                ptr++;
                break;
            case 'b':
                qstring_append(str, "\b");
                ptr++;
                break;
            case 'n':
                qstring_append(str, "\n");
                ptr++;
                break;
            case 'r':
                qstring_append(str, "\r");
                ptr++;
                break;
            case 't':
                qstring_append(str, "\t");
                ptr++;
                break;
            case 'u': {
                uint16_t unicode_char = 0;
                char utf8_char[4];
                int i = 0;

                ptr++;

                for (i = 0; i < 4; i++) {
                    if (qemu_isxdigit(*ptr)) {
                        unicode_char |= hex2decimal(*ptr) << ((3 - i) * 4);
                    } else {
                        parse_error(ctxt, token,
                                    "invalid hex escape sequence in string");
                        goto out;
                    }
                    ptr++;
                }

                wchar_to_utf8(unicode_char, utf8_char, sizeof(utf8_char));
                qstring_append(str, utf8_char);
            }   break;
            default:
                parse_error(ctxt, token, "invalid escape sequence in string");
                goto out;
            }
        } else {
            char dummy[2];

            dummy[0] = *ptr++;
            dummy[1] = 0;

            qstring_append(str, dummy);
        }
    }

    ptr++;

    return str;

out:
    QDECREF(str);
    return NULL;
}

/**
 * Parsing rules
 */
static int parse_pair(JSONParserContext *ctxt, QDict *dict, QList **tokens, va_list *ap)
{
    QObject *key, *token = NULL, *value, *peek;
    QList *working = qlist_copy(*tokens);

    peek = qlist_peek(working);
    key = parse_value(ctxt, &working, ap);
    if (qobject_type(key) != QTYPE_QSTRING) {
        parse_error(ctxt, peek, "key is not a string in object");
        goto out;
    }

    token = qlist_pop(working);
    if (!token_is_operator(token, ':')) {
        parse_error(ctxt, token, "missing : in object pair");
        goto out;
    }

    value = parse_value(ctxt, &working, ap);
    if (value == NULL) {
        parse_error(ctxt, token, "Missing value in dict");
        goto out;
    }

    qdict_put_obj(dict, qstring_get_str(qobject_to_qstring(key)), value);

    qobject_decref(token);
    qobject_decref(key);
    QDECREF(*tokens);
    *tokens = working;

    return 0;

out:
    qobject_decref(token);
    qobject_decref(key);
    QDECREF(working);

    return -1;
}

static QObject *parse_object(JSONParserContext *ctxt, QList **tokens, va_list *ap)
{
    QDict *dict = NULL;
    QObject *token, *peek;
    QList *working = qlist_copy(*tokens);

    token = qlist_pop(working);
    if (!token_is_operator(token, '{')) {
        goto out;
    }
    qobject_decref(token);
    token = NULL;

    dict = qdict_new();

    peek = qlist_peek(working);
    if (!token_is_operator(peek, '}')) {
        if (parse_pair(ctxt, dict, &working, ap) == -1) {
            goto out;
        }

        token = qlist_pop(working);
        while (!token_is_operator(token, '}')) {
            if (!token_is_operator(token, ',')) {
                parse_error(ctxt, token, "expected separator in dict");
                goto out;
            }
            qobject_decref(token);
            token = NULL;

            if (parse_pair(ctxt, dict, &working, ap) == -1) {
                goto out;
            }

            token = qlist_pop(working);
        }
        qobject_decref(token);
        token = NULL;
    } else {
        token = qlist_pop(working);
        qobject_decref(token);
        token = NULL;
    }

    QDECREF(*tokens);
    *tokens = working;

    return QOBJECT(dict);

out:
    qobject_decref(token);
    QDECREF(working);
    QDECREF(dict);
    return NULL;
}

static QObject *parse_array(JSONParserContext *ctxt, QList **tokens, va_list *ap)
{
    QList *list = NULL;
    QObject *token, *peek;
    QList *working = qlist_copy(*tokens);

    token = qlist_pop(working);
    if (!token_is_operator(token, '[')) {
        goto out;
    }
    qobject_decref(token);
    token = NULL;

    list = qlist_new();

    peek = qlist_peek(working);
    if (!token_is_operator(peek, ']')) {
        QObject *obj;

        obj = parse_value(ctxt, &working, ap);
        if (obj == NULL) {
            parse_error(ctxt, token, "expecting value");
            goto out;
        }

        qlist_append_obj(list, obj);

        token = qlist_pop(working);
        while (!token_is_operator(token, ']')) {
            if (!token_is_operator(token, ',')) {
                parse_error(ctxt, token, "expected separator in list");
                goto out;
            }

            qobject_decref(token);
            token = NULL;

            obj = parse_value(ctxt, &working, ap);
            if (obj == NULL) {
                parse_error(ctxt, token, "expecting value");
                goto out;
            }

            qlist_append_obj(list, obj);

            token = qlist_pop(working);
        }

        qobject_decref(token);
        token = NULL;
    } else {
        token = qlist_pop(working);
        qobject_decref(token);
        token = NULL;
    }

    QDECREF(*tokens);
    *tokens = working;

    return QOBJECT(list);

out:
    qobject_decref(token);
    QDECREF(working);
    QDECREF(list);
    return NULL;
}

static QObject *parse_keyword(JSONParserContext *ctxt, QList **tokens)
{
    QObject *token, *ret;
    QList *working = qlist_copy(*tokens);

    token = qlist_pop(working);

    if (token_get_type(token) != JSON_KEYWORD) {
        goto out;
    }

    if (token_is_keyword(token, "true")) {
        ret = QOBJECT(qbool_from_int(true));
    } else if (token_is_keyword(token, "false")) {
        ret = QOBJECT(qbool_from_int(false));
    } else {
        parse_error(ctxt, token, "invalid keyword `%s'", token_get_value(token));
        goto out;
    }

    qobject_decref(token);
    QDECREF(*tokens);
    *tokens = working;

    return ret;

out: 
    qobject_decref(token);
    QDECREF(working);

    return NULL;
}

static QObject *parse_escape(JSONParserContext *ctxt, QList **tokens, va_list *ap)
{
    QObject *token = NULL, *obj;
    QList *working = qlist_copy(*tokens);

    if (ap == NULL) {
        goto out;
    }

    token = qlist_pop(working);

    if (token_is_escape(token, "%p")) {
        obj = va_arg(*ap, QObject *);
    } else if (token_is_escape(token, "%i")) {
        obj = QOBJECT(qbool_from_int(va_arg(*ap, int)));
    } else if (token_is_escape(token, "%d")) {
        obj = QOBJECT(qint_from_int(va_arg(*ap, int)));
    } else if (token_is_escape(token, "%ld")) {
        obj = QOBJECT(qint_from_int(va_arg(*ap, long)));
    } else if (token_is_escape(token, "%lld")) {
        obj = QOBJECT(qint_from_int(va_arg(*ap, long long)));
    } else if (token_is_escape(token, "%s")) {
        obj = QOBJECT(qstring_from_str(va_arg(*ap, const char *)));
    } else if (token_is_escape(token, "%f")) {
        obj = QOBJECT(qfloat_from_double(va_arg(*ap, double)));
    } else {
        goto out;
    }

    qobject_decref(token);
    QDECREF(*tokens);
    *tokens = working;

    return obj;

out:
    qobject_decref(token);
    QDECREF(working);

    return NULL;
}

static QObject *parse_literal(JSONParserContext *ctxt, QList **tokens)
{
    QObject *token, *obj;
    QList *working = qlist_copy(*tokens);

    token = qlist_pop(working);
    switch (token_get_type(token)) {
    case JSON_STRING:
        obj = QOBJECT(qstring_from_escaped_str(ctxt, token));
        break;
    case JSON_INTEGER:
        obj = QOBJECT(qint_from_int(strtoll(token_get_value(token), NULL, 10)));
        break;
    case JSON_FLOAT:
        /* FIXME dependent on locale */
        obj = QOBJECT(qfloat_from_double(strtod(token_get_value(token), NULL)));
        break;
    default:
        goto out;
    }

    qobject_decref(token);
    QDECREF(*tokens);
    *tokens = working;

    return obj;

out:
    qobject_decref(token);
    QDECREF(working);

    return NULL;
}

static QObject *parse_value(JSONParserContext *ctxt, QList **tokens, va_list *ap)
{
    QObject *obj;

    obj = parse_object(ctxt, tokens, ap);
    if (obj == NULL) {
        obj = parse_array(ctxt, tokens, ap);
    }
    if (obj == NULL) {
        obj = parse_escape(ctxt, tokens, ap);
    }
    if (obj == NULL) {
        obj = parse_keyword(ctxt, tokens);
    } 
    if (obj == NULL) {
        obj = parse_literal(ctxt, tokens);
    }

    return obj;
}

QObject *json_parser_parse(QList *tokens, va_list *ap)
{
    JSONParserContext ctxt = {};
    QList *working = qlist_copy(tokens);
    QObject *result;

    result = parse_value(&ctxt, &working, ap);

    QDECREF(working);

    return result;
}
Commit	Line	Data
4a5fcab7 AL	1	/*
	2	* JSON Parser
	3	*
	4	* Copyright IBM, Corp. 2009
	5	*
	6	* Authors:
	7	* Anthony Liguori <[email protected]>
	8	*
	9	* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
	10	* See the COPYING.LIB file in the top-level directory.
	11	*
	12	*/
	13
	14	#include <stdbool.h>
	15
	16	#include "qemu-common.h"
	17	#include "qstring.h"
	18	#include "qint.h"
	19	#include "qdict.h"
	20	#include "qlist.h"
	21	#include "qfloat.h"
	22	#include "qbool.h"
	23	#include "json-parser.h"
	24	#include "json-lexer.h"
	25
	26	typedef struct JSONParserContext
	27	{
	28	} JSONParserContext;
	29
	30	#define BUG_ON(cond) assert(!(cond))
	31
	32	/**
	33	* TODO
	34	*
	35	* 0) make errors meaningful again
	36	* 1) add geometry information to tokens
	37	* 3) should we return a parsed size?
	38	* 4) deal with premature EOI
	39	*/
	40
	41	static QObject parse_value(JSONParserContext ctxt, QList *tokens, va_list ap);
	42
	43	/**
	44	* Token manipulators
	45	*
	46	* tokens are dictionaries that contain a type, a string value, and geometry information
	47	* about a token identified by the lexer. These are routines that make working with
	48	* these objects a bit easier.
	49	*/
	50	static const char token_get_value(QObject obj)
	51	{
	52	return qdict_get_str(qobject_to_qdict(obj), "token");
	53	}
	54
	55	static JSONTokenType token_get_type(QObject *obj)
	56	{
	57	return qdict_get_int(qobject_to_qdict(obj), "type");
	58	}
	59
	60	static int token_is_operator(QObject *obj, char op)
	61	{
	62	const char *val;
	63
	64	if (token_get_type(obj) != JSON_OPERATOR) {
65	return 0;
66	}
67
68	val = token_get_value(obj);
69
70	return (val[0] == op) && (val[1] == 0);
71	}
72
73	static int token_is_keyword(QObject obj, const char value)
74	{
75	if (token_get_type(obj) != JSON_KEYWORD) {
76	return 0;
77	}
78
79	return strcmp(token_get_value(obj), value) == 0;
80	}
81
82	static int token_is_escape(QObject obj, const char value)
83	{
84	if (token_get_type(obj) != JSON_ESCAPE) {
85	return 0;
86	}
87
88	return (strcmp(token_get_value(obj), value) == 0);
89	}
90
91	/**
92	* Error handler
93	*/
94	static void parse_error(JSONParserContext ctxt, QObject token, const char *msg, ...)
95	{
96	fprintf(stderr, "parse error: %s\n", msg);
97	}
98
99	/**
100	* String helpers
101	*
102	* These helpers are used to unescape strings.
103	*/
104	static void wchar_to_utf8(uint16_t wchar, char *buffer, size_t buffer_length)
105	{
106	if (wchar <= 0x007F) {
107	BUG_ON(buffer_length < 2);
108
109	buffer[0] = wchar & 0x7F;
110	buffer[1] = 0;
111	} else if (wchar <= 0x07FF) {
112	BUG_ON(buffer_length < 3);
113
114	buffer[0] = 0xC0 \| ((wchar >> 6) & 0x1F);
115	buffer[1] = 0x80 \| (wchar & 0x3F);
116	buffer[2] = 0;
117	} else {
118	BUG_ON(buffer_length < 4);
119
120	buffer[0] = 0xE0 \| ((wchar >> 12) & 0x0F);
121	buffer[1] = 0x80 \| ((wchar >> 6) & 0x3F);
122	buffer[2] = 0x80 \| (wchar & 0x3F);
123	buffer[3] = 0;
124	}
125	}
126
127	static int hex2decimal(char ch)
128	{
129	if (ch >= '0' && ch <= '9') {
130	return (ch - '0');
131	} else if (ch >= 'a' && ch <= 'f') {
132	return 10 + (ch - 'a');
133	} else if (ch >= 'A' && ch <= 'F') {
134	return 10 + (ch - 'A');
135	}
136
137	return -1;
138	}
139
140	/**
141	* parse_string(): Parse a json string and return a QObject
142	*
143	* string
144	* ""
145	* " chars "
146	* chars
147	* char
148	* char chars
149	* char
150	* any-Unicode-character-
151	* except-"-or-\-or-
152	* control-character
153	* \"
154	* \\
155	* \/
156	* \b
157	* \f
158	* \n
159	* \r
160	* \t
161	* \u four-hex-digits
162	*/
163	static QString qstring_from_escaped_str(JSONParserContext ctxt, QObject *token)
164	{
165	const char *ptr = token_get_value(token);
166	QString *str;
167	int double_quote = 1;
168
169	if (*ptr == '"') {
170	double_quote = 1;
171	} else {
172	double_quote = 0;
173	}
174	ptr++;
175
176	str = qstring_new();
177	while (*ptr &&
178	((double_quote && ptr != '"') \|\| (!double_quote && ptr != '\''))) {
179	if (*ptr == '\\') {
180	ptr++;
181
182	switch (*ptr) {
183	case '"':
184	qstring_append(str, "\"");
185	ptr++;
186	break;
187	case '\'':
188	qstring_append(str, "'");
189	ptr++;
190	break;
191	case '\\':
192	qstring_append(str, "\\");
193	ptr++;
194	break;
195	case '/':
196	qstring_append(str, "/");
197	ptr++;
198	break;
199	case 'b':
200	qstring_append(str, "\b");
201	ptr++;
202	break;
203	case 'n':
204	qstring_append(str, "\n");
205	ptr++;
206	break;
207	case 'r':
208	qstring_append(str, "\r");
209	ptr++;
210	break;
211	case 't':
212	qstring_append(str, "\t");
213	ptr++;
214	break;
215	case 'u': {
216	uint16_t unicode_char = 0;
217	char utf8_char[4];
218	int i = 0;
219
220	ptr++;
221
222	for (i = 0; i < 4; i++) {
223	if (qemu_isxdigit(*ptr)) {
224	unicode_char \|= hex2decimal(ptr) << ((3 - i) 4);
225	} else {
226	parse_error(ctxt, token,
227	"invalid hex escape sequence in string");
228	goto out;
229	}
230	ptr++;
231	}
232
233	wchar_to_utf8(unicode_char, utf8_char, sizeof(utf8_char));
234	qstring_append(str, utf8_char);
235	} break;
236	default:
237	parse_error(ctxt, token, "invalid escape sequence in string");
238	goto out;
239	}
240	} else {
241	char dummy[2];
242
243	dummy[0] = *ptr++;
244	dummy[1] = 0;
245
246	qstring_append(str, dummy);
247	}
248	}
249
250	ptr++;
251
252	return str;
253
254	out:
255	QDECREF(str);
256	return NULL;
257	}
258
259	/**
260	* Parsing rules
261	*/
262	static int parse_pair(JSONParserContext ctxt, QDict dict, QList *tokens, va_list ap)
263	{
264	QObject key, token = NULL, value, peek;
265	QList working = qlist_copy(tokens);
266
267	peek = qlist_peek(working);
268	key = parse_value(ctxt, &working, ap);
269	if (qobject_type(key) != QTYPE_QSTRING) {
270	parse_error(ctxt, peek, "key is not a string in object");
271	goto out;
272	}
273
274	token = qlist_pop(working);
275	if (!token_is_operator(token, ':')) {
276	parse_error(ctxt, token, "missing : in object pair");
277	goto out;
278	}
279
280	value = parse_value(ctxt, &working, ap);
281	if (value == NULL) {
282	parse_error(ctxt, token, "Missing value in dict");
283	goto out;
284	}
285
286	qdict_put_obj(dict, qstring_get_str(qobject_to_qstring(key)), value);
287
288	qobject_decref(token);
289	qobject_decref(key);
290	QDECREF(*tokens);
291	*tokens = working;
292
293	return 0;
294
295	out:
296	qobject_decref(token);
297	qobject_decref(key);
298	QDECREF(working);
299
300	return -1;
301	}
302
303	static QObject parse_object(JSONParserContext ctxt, QList *tokens, va_list ap)
304	{
305	QDict *dict = NULL;
306	QObject token, peek;
307	QList working = qlist_copy(tokens);
308
309	token = qlist_pop(working);
310	if (!token_is_operator(token, '{')) {
311	goto out;
312	}
313	qobject_decref(token);
314	token = NULL;
315
316	dict = qdict_new();
317
318	peek = qlist_peek(working);
319	if (!token_is_operator(peek, '}')) {
320	if (parse_pair(ctxt, dict, &working, ap) == -1) {
321	goto out;
322	}
323
324	token = qlist_pop(working);
325	while (!token_is_operator(token, '}')) {
326	if (!token_is_operator(token, ',')) {
327	parse_error(ctxt, token, "expected separator in dict");
328	goto out;
329	}
330	qobject_decref(token);
331	token = NULL;
332
333	if (parse_pair(ctxt, dict, &working, ap) == -1) {
334	goto out;
335	}
336
337	token = qlist_pop(working);
338	}
339	qobject_decref(token);
340	token = NULL;
341	} else {
342	token = qlist_pop(working);
343	qobject_decref(token);
344	token = NULL;
345	}
346
347	QDECREF(*tokens);
348	*tokens = working;
349
350	return QOBJECT(dict);
351
352	out:
353	qobject_decref(token);
354	QDECREF(working);
355	QDECREF(dict);
356	return NULL;
357	}
358
359	static QObject parse_array(JSONParserContext ctxt, QList *tokens, va_list ap)
360	{
361	QList *list = NULL;
362	QObject token, peek;
363	QList working = qlist_copy(tokens);
364
365	token = qlist_pop(working);
366	if (!token_is_operator(token, '[')) {
367	goto out;
368	}
369	qobject_decref(token);
370	token = NULL;
371
372	list = qlist_new();
373
374	peek = qlist_peek(working);
375	if (!token_is_operator(peek, ']')) {
376	QObject *obj;
377
378	obj = parse_value(ctxt, &working, ap);
379	if (obj == NULL) {
380	parse_error(ctxt, token, "expecting value");
381	goto out;
382	}
383
384	qlist_append_obj(list, obj);
385
386	token = qlist_pop(working);
387	while (!token_is_operator(token, ']')) {
388	if (!token_is_operator(token, ',')) {
389	parse_error(ctxt, token, "expected separator in list");
390	goto out;
391	}
392
393	qobject_decref(token);
394	token = NULL;
395
396	obj = parse_value(ctxt, &working, ap);
397	if (obj == NULL) {
398	parse_error(ctxt, token, "expecting value");
399	goto out;
400	}
401
402	qlist_append_obj(list, obj);
403
404	token = qlist_pop(working);
405	}
406
407	qobject_decref(token);
408	token = NULL;
409	} else {
410	token = qlist_pop(working);
411	qobject_decref(token);
412	token = NULL;
413	}
414
415	QDECREF(*tokens);
416	*tokens = working;
417
418	return QOBJECT(list);
419
420	out:
421	qobject_decref(token);
422	QDECREF(working);
423	QDECREF(list);
424	return NULL;
425	}
426
427	static QObject parse_keyword(JSONParserContext ctxt, QList **tokens)
428	{
429	QObject token, ret;
430	QList working = qlist_copy(tokens);
431
432	token = qlist_pop(working);
433
434	if (token_get_type(token) != JSON_KEYWORD) {
435	goto out;
436	}
437
438	if (token_is_keyword(token, "true")) {
439	ret = QOBJECT(qbool_from_int(true));
440	} else if (token_is_keyword(token, "false")) {
441	ret = QOBJECT(qbool_from_int(false));
442	} else {
443	parse_error(ctxt, token, "invalid keyword `%s'", token_get_value(token));
444	goto out;
445	}
446
447	qobject_decref(token);
448	QDECREF(*tokens);
449	*tokens = working;
450
451	return ret;
452
453	out:
454	qobject_decref(token);
455	QDECREF(working);
456
457	return NULL;
458	}
459
460	static QObject parse_escape(JSONParserContext ctxt, QList *tokens, va_list ap)
461	{
462	QObject token = NULL, obj;
463	QList working = qlist_copy(tokens);
464
465	if (ap == NULL) {
466	goto out;
467	}
468
469	token = qlist_pop(working);
470
471	if (token_is_escape(token, "%p")) {
472	obj = va_arg(ap, QObject );
473	} else if (token_is_escape(token, "%i")) {
474	obj = QOBJECT(qbool_from_int(va_arg(*ap, int)));
475	} else if (token_is_escape(token, "%d")) {
476	obj = QOBJECT(qint_from_int(va_arg(*ap, int)));
477	} else if (token_is_escape(token, "%ld")) {
478	obj = QOBJECT(qint_from_int(va_arg(*ap, long)));
479	} else if (token_is_escape(token, "%lld")) {
480	obj = QOBJECT(qint_from_int(va_arg(*ap, long long)));
481	} else if (token_is_escape(token, "%s")) {
482	obj = QOBJECT(qstring_from_str(va_arg(ap, const char )));
483	} else if (token_is_escape(token, "%f")) {
484	obj = QOBJECT(qfloat_from_double(va_arg(*ap, double)));
485	} else {
486	goto out;
487	}
488
489	qobject_decref(token);
490	QDECREF(*tokens);
491	*tokens = working;
492
493	return obj;
494
495	out:
496	qobject_decref(token);
497	QDECREF(working);
498
499	return NULL;
500	}
501
502	static QObject parse_literal(JSONParserContext ctxt, QList **tokens)
503	{
504	QObject token, obj;
505	QList working = qlist_copy(tokens);
506
507	token = qlist_pop(working);
508	switch (token_get_type(token)) {
509	case JSON_STRING:
510	obj = QOBJECT(qstring_from_escaped_str(ctxt, token));
511	break;
512	case JSON_INTEGER:
513	obj = QOBJECT(qint_from_int(strtoll(token_get_value(token), NULL, 10)));
514	break;
515	case JSON_FLOAT:
516	/* FIXME dependent on locale */
517	obj = QOBJECT(qfloat_from_double(strtod(token_get_value(token), NULL)));
518	break;
519	default:
520	goto out;
521	}
522
523	qobject_decref(token);
524	QDECREF(*tokens);
525	*tokens = working;
526
527	return obj;
528
529	out:
530	qobject_decref(token);
531	QDECREF(working);
532
533	return NULL;
534	}
535
536	static QObject parse_value(JSONParserContext ctxt, QList *tokens, va_list ap)
537	{
538	QObject *obj;
539
540	obj = parse_object(ctxt, tokens, ap);
541	if (obj == NULL) {
542	obj = parse_array(ctxt, tokens, ap);
543	}
544	if (obj == NULL) {
545	obj = parse_escape(ctxt, tokens, ap);
546	}
547	if (obj == NULL) {
548	obj = parse_keyword(ctxt, tokens);
549	}
550	if (obj == NULL) {
551	obj = parse_literal(ctxt, tokens);
552	}
553
554	return obj;
555	}
556
557	QObject json_parser_parse(QList tokens, va_list *ap)
558	{
559	JSONParserContext ctxt = {};
560	QList *working = qlist_copy(tokens);
561	QObject *result;
562
563	result = parse_value(&ctxt, &working, ap);
564
565	QDECREF(working);
566
567	return result;
568	}