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/*
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* JSON Parser
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*
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* Copyright IBM, Corp. 2009
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include <stdarg.h> |
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#include "qemu-common.h" |
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#include "qstring.h" |
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#include "qint.h" |
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#include "qdict.h" |
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#include "qlist.h" |
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#include "qfloat.h" |
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#include "qbool.h" |
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#include "json-parser.h" |
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#include "json-lexer.h" |
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#include "qerror.h" |
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|
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typedef struct JSONParserContext |
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{
|
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Error *err; |
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struct {
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QObject **buf; |
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size_t pos; |
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size_t count; |
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} tokens; |
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} JSONParserContext; |
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#define BUG_ON(cond) assert(!(cond))
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|
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/**
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* TODO
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*
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* 0) make errors meaningful again
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* 1) add geometry information to tokens
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* 3) should we return a parsed size?
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* 4) deal with premature EOI
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*/
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static QObject *parse_value(JSONParserContext *ctxt, va_list *ap);
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|
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/**
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* Token manipulators
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*
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* tokens are dictionaries that contain a type, a string value, and geometry information
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* about a token identified by the lexer. These are routines that make working with
|
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* these objects a bit easier.
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*/
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static const char *token_get_value(QObject *obj) |
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{
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return qdict_get_str(qobject_to_qdict(obj), "token"); |
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} |
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|
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static JSONTokenType token_get_type(QObject *obj)
|
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{
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return qdict_get_int(qobject_to_qdict(obj), "type"); |
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} |
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|
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static int token_is_operator(QObject *obj, char op) |
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{
|
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const char *val; |
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|
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if (token_get_type(obj) != JSON_OPERATOR) {
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return 0; |
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} |
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val = token_get_value(obj); |
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|
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return (val[0] == op) && (val[1] == 0); |
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} |
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|
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static int token_is_keyword(QObject *obj, const char *value) |
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{
|
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if (token_get_type(obj) != JSON_KEYWORD) {
|
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return 0; |
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} |
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|
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return strcmp(token_get_value(obj), value) == 0; |
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} |
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|
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static int token_is_escape(QObject *obj, const char *value) |
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{
|
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if (token_get_type(obj) != JSON_ESCAPE) {
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return 0; |
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} |
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|
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return (strcmp(token_get_value(obj), value) == 0); |
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} |
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|
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/**
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* Error handler
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*/
|
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static void GCC_FMT_ATTR(3, 4) parse_error(JSONParserContext *ctxt, |
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QObject *token, const char *msg, ...) |
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{
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va_list ap; |
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char message[1024]; |
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va_start(ap, msg); |
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vsnprintf(message, sizeof(message), msg, ap);
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va_end(ap); |
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if (ctxt->err) {
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error_free(ctxt->err); |
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ctxt->err = NULL;
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} |
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error_set(&ctxt->err, QERR_JSON_PARSE_ERROR, message); |
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} |
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|
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/**
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* String helpers
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*
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* These helpers are used to unescape strings.
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*/
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static void wchar_to_utf8(uint16_t wchar, char *buffer, size_t buffer_length) |
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{
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if (wchar <= 0x007F) { |
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BUG_ON(buffer_length < 2);
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buffer[0] = wchar & 0x7F; |
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buffer[1] = 0; |
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} else if (wchar <= 0x07FF) { |
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BUG_ON(buffer_length < 3);
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|
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buffer[0] = 0xC0 | ((wchar >> 6) & 0x1F); |
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buffer[1] = 0x80 | (wchar & 0x3F); |
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buffer[2] = 0; |
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} else {
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BUG_ON(buffer_length < 4);
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|
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buffer[0] = 0xE0 | ((wchar >> 12) & 0x0F); |
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buffer[1] = 0x80 | ((wchar >> 6) & 0x3F); |
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buffer[2] = 0x80 | (wchar & 0x3F); |
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buffer[3] = 0; |
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} |
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} |
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|
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static int hex2decimal(char ch) |
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{
|
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if (ch >= '0' && ch <= '9') { |
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return (ch - '0'); |
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} else if (ch >= 'a' && ch <= 'f') { |
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return 10 + (ch - 'a'); |
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} else if (ch >= 'A' && ch <= 'F') { |
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return 10 + (ch - 'A'); |
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} |
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|
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return -1; |
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} |
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|
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/**
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* parse_string(): Parse a json string and return a QObject
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*
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* string
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* ""
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* " chars "
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* chars
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* char
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* char chars
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* char
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* any-Unicode-character-
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* except-"-or-\-or-
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* control-character
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* \"
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* \\
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* \/
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* \b
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* \f
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* \n
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* \r
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* \t
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* \u four-hex-digits
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*/
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static QString *qstring_from_escaped_str(JSONParserContext *ctxt, QObject *token)
|
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{
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const char *ptr = token_get_value(token); |
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QString *str; |
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int double_quote = 1; |
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|
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if (*ptr == '"') { |
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double_quote = 1;
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} else {
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double_quote = 0;
|
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} |
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ptr++; |
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|
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str = qstring_new(); |
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while (*ptr &&
|
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((double_quote && *ptr != '"') || (!double_quote && *ptr != '\''))) { |
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if (*ptr == '\\') { |
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ptr++; |
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|
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switch (*ptr) {
|
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case '"': |
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qstring_append(str, "\"");
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ptr++; |
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break;
|
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case '\'': |
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qstring_append(str, "'");
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ptr++; |
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break;
|
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case '\\': |
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qstring_append(str, "\\");
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ptr++; |
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break;
|
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case '/': |
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qstring_append(str, "/");
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ptr++; |
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break;
|
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case 'b': |
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qstring_append(str, "\b");
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ptr++; |
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break;
|
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case 'f': |
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qstring_append(str, "\f");
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ptr++; |
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break;
|
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case 'n': |
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qstring_append(str, "\n");
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ptr++; |
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break;
|
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case 'r': |
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qstring_append(str, "\r");
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ptr++; |
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break;
|
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case 't': |
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qstring_append(str, "\t");
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ptr++; |
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break;
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case 'u': { |
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uint16_t unicode_char = 0;
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char utf8_char[4]; |
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int i = 0; |
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ptr++; |
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|
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for (i = 0; i < 4; i++) { |
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if (qemu_isxdigit(*ptr)) {
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unicode_char |= hex2decimal(*ptr) << ((3 - i) * 4); |
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} else {
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parse_error(ctxt, token, |
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"invalid hex escape sequence in string");
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goto out;
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} |
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ptr++; |
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} |
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wchar_to_utf8(unicode_char, utf8_char, sizeof(utf8_char));
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qstring_append(str, utf8_char); |
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} break;
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default:
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parse_error(ctxt, token, "invalid escape sequence in string");
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goto out;
|
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} |
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} else {
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char dummy[2]; |
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|
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dummy[0] = *ptr++;
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dummy[1] = 0; |
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|
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qstring_append(str, dummy); |
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} |
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} |
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|
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return str;
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|
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out:
|
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QDECREF(str); |
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return NULL; |
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} |
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|
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static QObject *parser_context_pop_token(JSONParserContext *ctxt)
|
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{
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QObject *token; |
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g_assert(ctxt->tokens.pos < ctxt->tokens.count); |
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token = ctxt->tokens.buf[ctxt->tokens.pos]; |
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ctxt->tokens.pos++; |
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return token;
|
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} |
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|
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/* Note: parser_context_{peek|pop}_token do not increment the
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* token object's refcount. In both cases the references will continue
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* to be tracked and cleaned up in parser_context_free(), so do not
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* attempt to free the token object.
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*/
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static QObject *parser_context_peek_token(JSONParserContext *ctxt)
|
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{
|
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QObject *token; |
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g_assert(ctxt->tokens.pos < ctxt->tokens.count); |
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token = ctxt->tokens.buf[ctxt->tokens.pos]; |
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return token;
|
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} |
| 299 |
|
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static JSONParserContext parser_context_save(JSONParserContext *ctxt)
|
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{
|
| 302 |
JSONParserContext saved_ctxt = {0};
|
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saved_ctxt.tokens.pos = ctxt->tokens.pos; |
| 304 |
saved_ctxt.tokens.count = ctxt->tokens.count; |
| 305 |
saved_ctxt.tokens.buf = ctxt->tokens.buf; |
| 306 |
return saved_ctxt;
|
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} |
| 308 |
|
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static void parser_context_restore(JSONParserContext *ctxt, |
| 310 |
JSONParserContext saved_ctxt) |
| 311 |
{
|
| 312 |
ctxt->tokens.pos = saved_ctxt.tokens.pos; |
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ctxt->tokens.count = saved_ctxt.tokens.count; |
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ctxt->tokens.buf = saved_ctxt.tokens.buf; |
| 315 |
} |
| 316 |
|
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static void tokens_append_from_iter(QObject *obj, void *opaque) |
| 318 |
{
|
| 319 |
JSONParserContext *ctxt = opaque; |
| 320 |
g_assert(ctxt->tokens.pos < ctxt->tokens.count); |
| 321 |
ctxt->tokens.buf[ctxt->tokens.pos++] = obj; |
| 322 |
qobject_incref(obj); |
| 323 |
} |
| 324 |
|
| 325 |
static JSONParserContext *parser_context_new(QList *tokens)
|
| 326 |
{
|
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JSONParserContext *ctxt; |
| 328 |
size_t count; |
| 329 |
|
| 330 |
if (!tokens) {
|
| 331 |
return NULL; |
| 332 |
} |
| 333 |
|
| 334 |
count = qlist_size(tokens); |
| 335 |
if (count == 0) { |
| 336 |
return NULL; |
| 337 |
} |
| 338 |
|
| 339 |
ctxt = g_malloc0(sizeof(JSONParserContext));
|
| 340 |
ctxt->tokens.pos = 0;
|
| 341 |
ctxt->tokens.count = count; |
| 342 |
ctxt->tokens.buf = g_malloc(count * sizeof(QObject *));
|
| 343 |
qlist_iter(tokens, tokens_append_from_iter, ctxt); |
| 344 |
ctxt->tokens.pos = 0;
|
| 345 |
|
| 346 |
return ctxt;
|
| 347 |
} |
| 348 |
|
| 349 |
/* to support error propagation, ctxt->err must be freed separately */
|
| 350 |
static void parser_context_free(JSONParserContext *ctxt) |
| 351 |
{
|
| 352 |
int i;
|
| 353 |
if (ctxt) {
|
| 354 |
for (i = 0; i < ctxt->tokens.count; i++) { |
| 355 |
qobject_decref(ctxt->tokens.buf[i]); |
| 356 |
} |
| 357 |
g_free(ctxt->tokens.buf); |
| 358 |
g_free(ctxt); |
| 359 |
} |
| 360 |
} |
| 361 |
|
| 362 |
/**
|
| 363 |
* Parsing rules
|
| 364 |
*/
|
| 365 |
static int parse_pair(JSONParserContext *ctxt, QDict *dict, va_list *ap) |
| 366 |
{
|
| 367 |
QObject *key = NULL, *token = NULL, *value, *peek; |
| 368 |
JSONParserContext saved_ctxt = parser_context_save(ctxt); |
| 369 |
|
| 370 |
peek = parser_context_peek_token(ctxt); |
| 371 |
if (peek == NULL) { |
| 372 |
parse_error(ctxt, NULL, "premature EOI"); |
| 373 |
goto out;
|
| 374 |
} |
| 375 |
|
| 376 |
key = parse_value(ctxt, ap); |
| 377 |
if (!key || qobject_type(key) != QTYPE_QSTRING) {
|
| 378 |
parse_error(ctxt, peek, "key is not a string in object");
|
| 379 |
goto out;
|
| 380 |
} |
| 381 |
|
| 382 |
token = parser_context_pop_token(ctxt); |
| 383 |
if (token == NULL) { |
| 384 |
parse_error(ctxt, NULL, "premature EOI"); |
| 385 |
goto out;
|
| 386 |
} |
| 387 |
|
| 388 |
if (!token_is_operator(token, ':')) { |
| 389 |
parse_error(ctxt, token, "missing : in object pair");
|
| 390 |
goto out;
|
| 391 |
} |
| 392 |
|
| 393 |
value = parse_value(ctxt, ap); |
| 394 |
if (value == NULL) { |
| 395 |
parse_error(ctxt, token, "Missing value in dict");
|
| 396 |
goto out;
|
| 397 |
} |
| 398 |
|
| 399 |
qdict_put_obj(dict, qstring_get_str(qobject_to_qstring(key)), value); |
| 400 |
|
| 401 |
qobject_decref(key); |
| 402 |
|
| 403 |
return 0; |
| 404 |
|
| 405 |
out:
|
| 406 |
parser_context_restore(ctxt, saved_ctxt); |
| 407 |
qobject_decref(key); |
| 408 |
|
| 409 |
return -1; |
| 410 |
} |
| 411 |
|
| 412 |
static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
|
| 413 |
{
|
| 414 |
QDict *dict = NULL;
|
| 415 |
QObject *token, *peek; |
| 416 |
JSONParserContext saved_ctxt = parser_context_save(ctxt); |
| 417 |
|
| 418 |
token = parser_context_pop_token(ctxt); |
| 419 |
if (token == NULL) { |
| 420 |
goto out;
|
| 421 |
} |
| 422 |
|
| 423 |
if (!token_is_operator(token, '{')) { |
| 424 |
goto out;
|
| 425 |
} |
| 426 |
token = NULL;
|
| 427 |
|
| 428 |
dict = qdict_new(); |
| 429 |
|
| 430 |
peek = parser_context_peek_token(ctxt); |
| 431 |
if (peek == NULL) { |
| 432 |
parse_error(ctxt, NULL, "premature EOI"); |
| 433 |
goto out;
|
| 434 |
} |
| 435 |
|
| 436 |
if (!token_is_operator(peek, '}')) { |
| 437 |
if (parse_pair(ctxt, dict, ap) == -1) { |
| 438 |
goto out;
|
| 439 |
} |
| 440 |
|
| 441 |
token = parser_context_pop_token(ctxt); |
| 442 |
if (token == NULL) { |
| 443 |
parse_error(ctxt, NULL, "premature EOI"); |
| 444 |
goto out;
|
| 445 |
} |
| 446 |
|
| 447 |
while (!token_is_operator(token, '}')) { |
| 448 |
if (!token_is_operator(token, ',')) { |
| 449 |
parse_error(ctxt, token, "expected separator in dict");
|
| 450 |
goto out;
|
| 451 |
} |
| 452 |
token = NULL;
|
| 453 |
|
| 454 |
if (parse_pair(ctxt, dict, ap) == -1) { |
| 455 |
goto out;
|
| 456 |
} |
| 457 |
|
| 458 |
token = parser_context_pop_token(ctxt); |
| 459 |
if (token == NULL) { |
| 460 |
parse_error(ctxt, NULL, "premature EOI"); |
| 461 |
goto out;
|
| 462 |
} |
| 463 |
} |
| 464 |
token = NULL;
|
| 465 |
} else {
|
| 466 |
token = parser_context_pop_token(ctxt); |
| 467 |
token = NULL;
|
| 468 |
} |
| 469 |
|
| 470 |
return QOBJECT(dict);
|
| 471 |
|
| 472 |
out:
|
| 473 |
parser_context_restore(ctxt, saved_ctxt); |
| 474 |
QDECREF(dict); |
| 475 |
return NULL; |
| 476 |
} |
| 477 |
|
| 478 |
static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
|
| 479 |
{
|
| 480 |
QList *list = NULL;
|
| 481 |
QObject *token, *peek; |
| 482 |
JSONParserContext saved_ctxt = parser_context_save(ctxt); |
| 483 |
|
| 484 |
token = parser_context_pop_token(ctxt); |
| 485 |
if (token == NULL) { |
| 486 |
goto out;
|
| 487 |
} |
| 488 |
|
| 489 |
if (!token_is_operator(token, '[')) { |
| 490 |
token = NULL;
|
| 491 |
goto out;
|
| 492 |
} |
| 493 |
token = NULL;
|
| 494 |
|
| 495 |
list = qlist_new(); |
| 496 |
|
| 497 |
peek = parser_context_peek_token(ctxt); |
| 498 |
if (peek == NULL) { |
| 499 |
parse_error(ctxt, NULL, "premature EOI"); |
| 500 |
goto out;
|
| 501 |
} |
| 502 |
|
| 503 |
if (!token_is_operator(peek, ']')) { |
| 504 |
QObject *obj; |
| 505 |
|
| 506 |
obj = parse_value(ctxt, ap); |
| 507 |
if (obj == NULL) { |
| 508 |
parse_error(ctxt, token, "expecting value");
|
| 509 |
goto out;
|
| 510 |
} |
| 511 |
|
| 512 |
qlist_append_obj(list, obj); |
| 513 |
|
| 514 |
token = parser_context_pop_token(ctxt); |
| 515 |
if (token == NULL) { |
| 516 |
parse_error(ctxt, NULL, "premature EOI"); |
| 517 |
goto out;
|
| 518 |
} |
| 519 |
|
| 520 |
while (!token_is_operator(token, ']')) { |
| 521 |
if (!token_is_operator(token, ',')) { |
| 522 |
parse_error(ctxt, token, "expected separator in list");
|
| 523 |
goto out;
|
| 524 |
} |
| 525 |
|
| 526 |
token = NULL;
|
| 527 |
|
| 528 |
obj = parse_value(ctxt, ap); |
| 529 |
if (obj == NULL) { |
| 530 |
parse_error(ctxt, token, "expecting value");
|
| 531 |
goto out;
|
| 532 |
} |
| 533 |
|
| 534 |
qlist_append_obj(list, obj); |
| 535 |
|
| 536 |
token = parser_context_pop_token(ctxt); |
| 537 |
if (token == NULL) { |
| 538 |
parse_error(ctxt, NULL, "premature EOI"); |
| 539 |
goto out;
|
| 540 |
} |
| 541 |
} |
| 542 |
|
| 543 |
token = NULL;
|
| 544 |
} else {
|
| 545 |
token = parser_context_pop_token(ctxt); |
| 546 |
token = NULL;
|
| 547 |
} |
| 548 |
|
| 549 |
return QOBJECT(list);
|
| 550 |
|
| 551 |
out:
|
| 552 |
parser_context_restore(ctxt, saved_ctxt); |
| 553 |
QDECREF(list); |
| 554 |
return NULL; |
| 555 |
} |
| 556 |
|
| 557 |
static QObject *parse_keyword(JSONParserContext *ctxt)
|
| 558 |
{
|
| 559 |
QObject *token, *ret; |
| 560 |
JSONParserContext saved_ctxt = parser_context_save(ctxt); |
| 561 |
|
| 562 |
token = parser_context_pop_token(ctxt); |
| 563 |
if (token == NULL) { |
| 564 |
goto out;
|
| 565 |
} |
| 566 |
|
| 567 |
if (token_get_type(token) != JSON_KEYWORD) {
|
| 568 |
goto out;
|
| 569 |
} |
| 570 |
|
| 571 |
if (token_is_keyword(token, "true")) { |
| 572 |
ret = QOBJECT(qbool_from_int(true));
|
| 573 |
} else if (token_is_keyword(token, "false")) { |
| 574 |
ret = QOBJECT(qbool_from_int(false));
|
| 575 |
} else {
|
| 576 |
parse_error(ctxt, token, "invalid keyword `%s'", token_get_value(token));
|
| 577 |
goto out;
|
| 578 |
} |
| 579 |
|
| 580 |
return ret;
|
| 581 |
|
| 582 |
out:
|
| 583 |
parser_context_restore(ctxt, saved_ctxt); |
| 584 |
|
| 585 |
return NULL; |
| 586 |
} |
| 587 |
|
| 588 |
static QObject *parse_escape(JSONParserContext *ctxt, va_list *ap)
|
| 589 |
{
|
| 590 |
QObject *token = NULL, *obj;
|
| 591 |
JSONParserContext saved_ctxt = parser_context_save(ctxt); |
| 592 |
|
| 593 |
if (ap == NULL) { |
| 594 |
goto out;
|
| 595 |
} |
| 596 |
|
| 597 |
token = parser_context_pop_token(ctxt); |
| 598 |
if (token == NULL) { |
| 599 |
goto out;
|
| 600 |
} |
| 601 |
|
| 602 |
if (token_is_escape(token, "%p")) { |
| 603 |
obj = va_arg(*ap, QObject *); |
| 604 |
} else if (token_is_escape(token, "%i")) { |
| 605 |
obj = QOBJECT(qbool_from_int(va_arg(*ap, int)));
|
| 606 |
} else if (token_is_escape(token, "%d")) { |
| 607 |
obj = QOBJECT(qint_from_int(va_arg(*ap, int)));
|
| 608 |
} else if (token_is_escape(token, "%ld")) { |
| 609 |
obj = QOBJECT(qint_from_int(va_arg(*ap, long)));
|
| 610 |
} else if (token_is_escape(token, "%lld") || |
| 611 |
token_is_escape(token, "%I64d")) {
|
| 612 |
obj = QOBJECT(qint_from_int(va_arg(*ap, long long))); |
| 613 |
} else if (token_is_escape(token, "%s")) { |
| 614 |
obj = QOBJECT(qstring_from_str(va_arg(*ap, const char *))); |
| 615 |
} else if (token_is_escape(token, "%f")) { |
| 616 |
obj = QOBJECT(qfloat_from_double(va_arg(*ap, double)));
|
| 617 |
} else {
|
| 618 |
goto out;
|
| 619 |
} |
| 620 |
|
| 621 |
return obj;
|
| 622 |
|
| 623 |
out:
|
| 624 |
parser_context_restore(ctxt, saved_ctxt); |
| 625 |
|
| 626 |
return NULL; |
| 627 |
} |
| 628 |
|
| 629 |
static QObject *parse_literal(JSONParserContext *ctxt)
|
| 630 |
{
|
| 631 |
QObject *token, *obj; |
| 632 |
JSONParserContext saved_ctxt = parser_context_save(ctxt); |
| 633 |
|
| 634 |
token = parser_context_pop_token(ctxt); |
| 635 |
if (token == NULL) { |
| 636 |
goto out;
|
| 637 |
} |
| 638 |
|
| 639 |
switch (token_get_type(token)) {
|
| 640 |
case JSON_STRING:
|
| 641 |
obj = QOBJECT(qstring_from_escaped_str(ctxt, token)); |
| 642 |
break;
|
| 643 |
case JSON_INTEGER:
|
| 644 |
obj = QOBJECT(qint_from_int(strtoll(token_get_value(token), NULL, 10))); |
| 645 |
break;
|
| 646 |
case JSON_FLOAT:
|
| 647 |
/* FIXME dependent on locale */
|
| 648 |
obj = QOBJECT(qfloat_from_double(strtod(token_get_value(token), NULL)));
|
| 649 |
break;
|
| 650 |
default:
|
| 651 |
goto out;
|
| 652 |
} |
| 653 |
|
| 654 |
return obj;
|
| 655 |
|
| 656 |
out:
|
| 657 |
parser_context_restore(ctxt, saved_ctxt); |
| 658 |
|
| 659 |
return NULL; |
| 660 |
} |
| 661 |
|
| 662 |
static QObject *parse_value(JSONParserContext *ctxt, va_list *ap)
|
| 663 |
{
|
| 664 |
QObject *obj; |
| 665 |
|
| 666 |
obj = parse_object(ctxt, ap); |
| 667 |
if (obj == NULL) { |
| 668 |
obj = parse_array(ctxt, ap); |
| 669 |
} |
| 670 |
if (obj == NULL) { |
| 671 |
obj = parse_escape(ctxt, ap); |
| 672 |
} |
| 673 |
if (obj == NULL) { |
| 674 |
obj = parse_keyword(ctxt); |
| 675 |
} |
| 676 |
if (obj == NULL) { |
| 677 |
obj = parse_literal(ctxt); |
| 678 |
} |
| 679 |
|
| 680 |
return obj;
|
| 681 |
} |
| 682 |
|
| 683 |
QObject *json_parser_parse(QList *tokens, va_list *ap) |
| 684 |
{
|
| 685 |
return json_parser_parse_err(tokens, ap, NULL); |
| 686 |
} |
| 687 |
|
| 688 |
QObject *json_parser_parse_err(QList *tokens, va_list *ap, Error **errp) |
| 689 |
{
|
| 690 |
JSONParserContext *ctxt = parser_context_new(tokens); |
| 691 |
QObject *result; |
| 692 |
|
| 693 |
if (!ctxt) {
|
| 694 |
return NULL; |
| 695 |
} |
| 696 |
|
| 697 |
result = parse_value(ctxt, ap); |
| 698 |
|
| 699 |
error_propagate(errp, ctxt->err); |
| 700 |
|
| 701 |
parser_context_free(ctxt); |
| 702 |
|
| 703 |
return result;
|
| 704 |
} |