#include "qemu/osdep.h"
#include "qemu/cutils.h"
+#include "qemu/unicode.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "qapi/qmp/qbool.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qlist.h"
+#include "qapi/qmp/qnull.h"
+#include "qapi/qmp/qnum.h"
#include "qapi/qmp/qstring.h"
-#include "qapi/qmp/json-parser.h"
-#include "qapi/qmp/json-lexer.h"
-#include "qapi/qmp/json-streamer.h"
+#include "json-parser-int.h"
+
+struct JSONToken {
+ JSONTokenType type;
+ int x;
+ int y;
+ char str[];
+};
typedef struct JSONParserContext
{
Error *err;
JSONToken *current;
GQueue *buf;
+ va_list *ap;
} JSONParserContext;
#define BUG_ON(cond) assert(!(cond))
* 4) deal with premature EOI
*/
-static QObject *parse_value(JSONParserContext *ctxt, va_list *ap);
+static QObject *parse_value(JSONParserContext *ctxt);
/**
* Error handler
{
va_list ap;
char message[1024];
+
+ if (ctxt->err) {
+ return;
+ }
va_start(ap, msg);
vsnprintf(message, sizeof(message), msg, ap);
va_end(ap);
- if (ctxt->err) {
- error_free(ctxt->err);
- ctxt->err = NULL;
- }
error_setg(&ctxt->err, "JSON parse error, %s", message);
}
-/**
- * String helpers
- *
- * These helpers are used to unescape strings.
- */
-static void wchar_to_utf8(uint16_t wchar, char *buffer, size_t buffer_length)
+static int cvt4hex(const char *s)
{
- 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);
+ int cp, i;
- 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');
+ cp = 0;
+ for (i = 0; i < 4; i++) {
+ if (!qemu_isxdigit(s[i])) {
+ return -1;
+ }
+ cp <<= 4;
+ if (s[i] >= '0' && s[i] <= '9') {
+ cp |= s[i] - '0';
+ } else if (s[i] >= 'a' && s[i] <= 'f') {
+ cp |= 10 + s[i] - 'a';
+ } else if (s[i] >= 'A' && s[i] <= 'F') {
+ cp |= 10 + s[i] - 'A';
+ } else {
+ return -1;
+ }
}
-
- return -1;
+ return cp;
}
/**
- * parse_string(): Parse a json string and return a QObject
+ * parse_string(): Parse a JSON string
+ *
+ * From RFC 8259 "The JavaScript Object Notation (JSON) Data
+ * Interchange Format":
+ *
+ * char = unescaped /
+ * escape (
+ * %x22 / ; " quotation mark U+0022
+ * %x5C / ; \ reverse solidus U+005C
+ * %x2F / ; / solidus U+002F
+ * %x62 / ; b backspace U+0008
+ * %x66 / ; f form feed U+000C
+ * %x6E / ; n line feed U+000A
+ * %x72 / ; r carriage return U+000D
+ * %x74 / ; t tab U+0009
+ * %x75 4HEXDIG ) ; uXXXX U+XXXX
+ * escape = %x5C ; \
+ * quotation-mark = %x22 ; "
+ * unescaped = %x20-21 / %x23-5B / %x5D-10FFFF
+ *
+ * Extensions over RFC 8259:
+ * - Extra escape sequence in strings:
+ * 0x27 (apostrophe) is recognized after escape, too
+ * - Single-quoted strings:
+ * Like double-quoted strings, except they're delimited by %x27
+ * (apostrophe) instead of %x22 (quotation mark), and can't contain
+ * unescaped apostrophe, but can contain unescaped quotation mark.
*
- * string
- * ""
- * " chars "
- * chars
- * char
- * char chars
- * char
- * any-Unicode-character-
- * except-"-or-\-or-
- * control-character
- * \"
- * \\
- * \/
- * \b
- * \f
- * \n
- * \r
- * \t
- * \u four-hex-digits
+ * Note:
+ * - Encoding is modified UTF-8.
+ * - Invalid Unicode characters are rejected.
+ * - Control characters \x00..\x1F are rejected by the lexer.
*/
-static QString *qstring_from_escaped_str(JSONParserContext *ctxt,
- JSONToken *token)
+static QString *parse_string(JSONParserContext *ctxt, JSONToken *token)
{
const char *ptr = token->str;
QString *str;
- int double_quote = 1;
-
- if (*ptr == '"') {
- double_quote = 1;
- } else {
- double_quote = 0;
- }
- ptr++;
-
+ char quote;
+ const char *beg;
+ int cp, trailing;
+ char *end;
+ ssize_t len;
+ char utf8_buf[5];
+
+ assert(*ptr == '"' || *ptr == '\'');
+ quote = *ptr++;
str = qstring_new();
- while (*ptr &&
- ((double_quote && *ptr != '"') || (!double_quote && *ptr != '\''))) {
- if (*ptr == '\\') {
- ptr++;
- switch (*ptr) {
+ while (*ptr != quote) {
+ assert(*ptr);
+ switch (*ptr) {
+ case '\\':
+ beg = ptr++;
+ switch (*ptr++) {
case '"':
- qstring_append(str, "\"");
- ptr++;
+ qstring_append_chr(str, '"');
break;
case '\'':
- qstring_append(str, "'");
- ptr++;
+ qstring_append_chr(str, '\'');
break;
case '\\':
- qstring_append(str, "\\");
- ptr++;
+ qstring_append_chr(str, '\\');
break;
case '/':
- qstring_append(str, "/");
- ptr++;
+ qstring_append_chr(str, '/');
break;
case 'b':
- qstring_append(str, "\b");
- ptr++;
+ qstring_append_chr(str, '\b');
break;
case 'f':
- qstring_append(str, "\f");
- ptr++;
+ qstring_append_chr(str, '\f');
break;
case 'n':
- qstring_append(str, "\n");
- ptr++;
+ qstring_append_chr(str, '\n');
break;
case 'r':
- qstring_append(str, "\r");
- ptr++;
+ qstring_append_chr(str, '\r');
break;
case 't':
- qstring_append(str, "\t");
- ptr++;
+ qstring_append_chr(str, '\t');
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);
+ case 'u':
+ cp = cvt4hex(ptr);
+ ptr += 4;
+
+ /* handle surrogate pairs */
+ if (cp >= 0xD800 && cp <= 0xDBFF
+ && ptr[0] == '\\' && ptr[1] == 'u') {
+ /* leading surrogate followed by \u */
+ cp = 0x10000 + ((cp & 0x3FF) << 10);
+ trailing = cvt4hex(ptr + 2);
+ if (trailing >= 0xDC00 && trailing <= 0xDFFF) {
+ /* followed by trailing surrogate */
+ cp |= trailing & 0x3FF;
+ ptr += 6;
} else {
- parse_error(ctxt, token,
- "invalid hex escape sequence in string");
- goto out;
+ cp = -1; /* invalid */
}
- ptr++;
}
- wchar_to_utf8(unicode_char, utf8_char, sizeof(utf8_char));
- qstring_append(str, utf8_char);
- } break;
+ if (mod_utf8_encode(utf8_buf, sizeof(utf8_buf), cp) < 0) {
+ parse_error(ctxt, token,
+ "%.*s is not a valid Unicode character",
+ (int)(ptr - beg), beg);
+ goto out;
+ }
+ qstring_append(str, utf8_buf);
+ 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);
+ break;
+ case '%':
+ if (ctxt->ap && ptr[1] != '%') {
+ parse_error(ctxt, token, "can't interpolate into string");
+ goto out;
+ }
+ ptr++;
+ /* fall through */
+ default:
+ cp = mod_utf8_codepoint(ptr, 6, &end);
+ if (cp < 0) {
+ parse_error(ctxt, token, "invalid UTF-8 sequence in string");
+ goto out;
+ }
+ ptr = end;
+ len = mod_utf8_encode(utf8_buf, sizeof(utf8_buf), cp);
+ assert(len >= 0);
+ qstring_append(str, utf8_buf);
}
}
return str;
out:
- QDECREF(str);
+ qobject_unref(str);
return NULL;
}
static JSONToken *parser_context_pop_token(JSONParserContext *ctxt)
{
g_free(ctxt->current);
- assert(!g_queue_is_empty(ctxt->buf));
ctxt->current = g_queue_pop_head(ctxt->buf);
return ctxt->current;
}
static JSONToken *parser_context_peek_token(JSONParserContext *ctxt)
{
- assert(!g_queue_is_empty(ctxt->buf));
return g_queue_peek_head(ctxt->buf);
}
-static JSONParserContext *parser_context_new(GQueue *tokens)
-{
- JSONParserContext *ctxt;
-
- if (!tokens) {
- return NULL;
- }
-
- ctxt = g_malloc0(sizeof(JSONParserContext));
- ctxt->buf = tokens;
-
- return ctxt;
-}
-
-/* to support error propagation, ctxt->err must be freed separately */
-static void parser_context_free(JSONParserContext *ctxt)
-{
- if (ctxt) {
- while (!g_queue_is_empty(ctxt->buf)) {
- parser_context_pop_token(ctxt);
- }
- g_free(ctxt->current);
- g_queue_free(ctxt->buf);
- g_free(ctxt);
- }
-}
-
/**
* Parsing rules
*/
-static int parse_pair(JSONParserContext *ctxt, QDict *dict, va_list *ap)
+static int parse_pair(JSONParserContext *ctxt, QDict *dict)
{
- QObject *key = NULL, *value;
+ QObject *value;
+ QString *key = NULL;
JSONToken *peek, *token;
peek = parser_context_peek_token(ctxt);
goto out;
}
- key = parse_value(ctxt, ap);
- if (!key || qobject_type(key) != QTYPE_QSTRING) {
+ key = qobject_to(QString, parse_value(ctxt));
+ if (!key) {
parse_error(ctxt, peek, "key is not a string in object");
goto out;
}
goto out;
}
- value = parse_value(ctxt, ap);
+ value = parse_value(ctxt);
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);
+ qdict_put_obj(dict, qstring_get_str(key), value);
- qobject_decref(key);
+ qobject_unref(key);
return 0;
out:
- qobject_decref(key);
+ qobject_unref(key);
return -1;
}
-static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
+static QObject *parse_object(JSONParserContext *ctxt)
{
QDict *dict = NULL;
JSONToken *token, *peek;
}
if (peek->type != JSON_RCURLY) {
- if (parse_pair(ctxt, dict, ap) == -1) {
+ if (parse_pair(ctxt, dict) == -1) {
goto out;
}
goto out;
}
- if (parse_pair(ctxt, dict, ap) == -1) {
+ if (parse_pair(ctxt, dict) == -1) {
goto out;
}
return QOBJECT(dict);
out:
- QDECREF(dict);
+ qobject_unref(dict);
return NULL;
}
-static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
+static QObject *parse_array(JSONParserContext *ctxt)
{
QList *list = NULL;
JSONToken *token, *peek;
if (peek->type != JSON_RSQUARE) {
QObject *obj;
- obj = parse_value(ctxt, ap);
+ obj = parse_value(ctxt);
if (obj == NULL) {
parse_error(ctxt, token, "expecting value");
goto out;
goto out;
}
- obj = parse_value(ctxt, ap);
+ obj = parse_value(ctxt);
if (obj == NULL) {
parse_error(ctxt, token, "expecting value");
goto out;
return QOBJECT(list);
out:
- QDECREF(list);
+ qobject_unref(list);
return NULL;
}
return NULL;
}
-static QObject *parse_escape(JSONParserContext *ctxt, va_list *ap)
+static QObject *parse_interpolation(JSONParserContext *ctxt)
{
JSONToken *token;
- if (ap == NULL) {
- return NULL;
- }
-
token = parser_context_pop_token(ctxt);
- assert(token && token->type == JSON_ESCAPE);
+ assert(token && token->type == JSON_INTERP);
if (!strcmp(token->str, "%p")) {
- return va_arg(*ap, QObject *);
+ return va_arg(*ctxt->ap, QObject *);
} else if (!strcmp(token->str, "%i")) {
- return QOBJECT(qbool_from_bool(va_arg(*ap, int)));
+ return QOBJECT(qbool_from_bool(va_arg(*ctxt->ap, int)));
} else if (!strcmp(token->str, "%d")) {
- return QOBJECT(qnum_from_int(va_arg(*ap, int)));
+ return QOBJECT(qnum_from_int(va_arg(*ctxt->ap, int)));
} else if (!strcmp(token->str, "%ld")) {
- return QOBJECT(qnum_from_int(va_arg(*ap, long)));
- } else if (!strcmp(token->str, "%lld") ||
- !strcmp(token->str, "%I64d")) {
- return QOBJECT(qnum_from_int(va_arg(*ap, long long)));
+ return QOBJECT(qnum_from_int(va_arg(*ctxt->ap, long)));
+ } else if (!strcmp(token->str, "%lld")) {
+ return QOBJECT(qnum_from_int(va_arg(*ctxt->ap, long long)));
+ } else if (!strcmp(token->str, "%" PRId64)) {
+ return QOBJECT(qnum_from_int(va_arg(*ctxt->ap, int64_t)));
} else if (!strcmp(token->str, "%u")) {
- return QOBJECT(qnum_from_uint(va_arg(*ap, unsigned int)));
+ return QOBJECT(qnum_from_uint(va_arg(*ctxt->ap, unsigned int)));
} else if (!strcmp(token->str, "%lu")) {
- return QOBJECT(qnum_from_uint(va_arg(*ap, unsigned long)));
- } else if (!strcmp(token->str, "%llu") ||
- !strcmp(token->str, "%I64u")) {
- return QOBJECT(qnum_from_uint(va_arg(*ap, unsigned long long)));
+ return QOBJECT(qnum_from_uint(va_arg(*ctxt->ap, unsigned long)));
+ } else if (!strcmp(token->str, "%llu")) {
+ return QOBJECT(qnum_from_uint(va_arg(*ctxt->ap, unsigned long long)));
+ } else if (!strcmp(token->str, "%" PRIu64)) {
+ return QOBJECT(qnum_from_uint(va_arg(*ctxt->ap, uint64_t)));
} else if (!strcmp(token->str, "%s")) {
- return QOBJECT(qstring_from_str(va_arg(*ap, const char *)));
+ return QOBJECT(qstring_from_str(va_arg(*ctxt->ap, const char *)));
} else if (!strcmp(token->str, "%f")) {
- return QOBJECT(qnum_from_double(va_arg(*ap, double)));
+ return QOBJECT(qnum_from_double(va_arg(*ctxt->ap, double)));
}
+ parse_error(ctxt, token, "invalid interpolation '%s'", token->str);
return NULL;
}
switch (token->type) {
case JSON_STRING:
- return QOBJECT(qstring_from_escaped_str(ctxt, token));
+ return QOBJECT(parse_string(ctxt, token));
case JSON_INTEGER: {
/*
* Represent JSON_INTEGER as QNUM_I64 if possible, else as
}
case JSON_FLOAT:
/* FIXME dependent on locale; a pervasive issue in QEMU */
- /* FIXME our lexer matches RFC 7159 in forbidding Inf or NaN,
+ /* FIXME our lexer matches RFC 8259 in forbidding Inf or NaN,
* but those might be useful extensions beyond JSON */
return QOBJECT(qnum_from_double(strtod(token->str, NULL)));
default:
}
}
-static QObject *parse_value(JSONParserContext *ctxt, va_list *ap)
+static QObject *parse_value(JSONParserContext *ctxt)
{
JSONToken *token;
switch (token->type) {
case JSON_LCURLY:
- return parse_object(ctxt, ap);
+ return parse_object(ctxt);
case JSON_LSQUARE:
- return parse_array(ctxt, ap);
- case JSON_ESCAPE:
- return parse_escape(ctxt, ap);
+ return parse_array(ctxt);
+ case JSON_INTERP:
+ return parse_interpolation(ctxt);
case JSON_INTEGER:
case JSON_FLOAT:
case JSON_STRING:
}
}
-QObject *json_parser_parse(GQueue *tokens, va_list *ap)
+JSONToken *json_token(JSONTokenType type, int x, int y, GString *tokstr)
{
- return json_parser_parse_err(tokens, ap, NULL);
+ JSONToken *token = g_malloc(sizeof(JSONToken) + tokstr->len + 1);
+
+ token->type = type;
+ memcpy(token->str, tokstr->str, tokstr->len);
+ token->str[tokstr->len] = 0;
+ token->x = x;
+ token->y = y;
+ return token;
}
-QObject *json_parser_parse_err(GQueue *tokens, va_list *ap, Error **errp)
+QObject *json_parser_parse(GQueue *tokens, va_list *ap, Error **errp)
{
- JSONParserContext *ctxt = parser_context_new(tokens);
+ JSONParserContext ctxt = { .buf = tokens, .ap = ap };
QObject *result;
- if (!ctxt) {
- return NULL;
- }
-
- result = parse_value(ctxt, ap);
+ result = parse_value(&ctxt);
+ assert(ctxt.err || g_queue_is_empty(ctxt.buf));
- error_propagate(errp, ctxt->err);
+ error_propagate(errp, ctxt.err);
- parser_context_free(ctxt);
+ while (!g_queue_is_empty(ctxt.buf)) {
+ parser_context_pop_token(&ctxt);
+ }
+ g_free(ctxt.current);
return result;
}
projects / qemu.git / blobdiff