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authorMarkus Armbruster <armbru@redhat.com>2018-08-23 18:40:22 +0200
committerMarkus Armbruster <armbru@redhat.com>2018-08-24 20:26:37 +0200
commitada74c3ba1b4f51e4462e186c251eaa974015bb8 (patch)
tree563fca93cf6087ad396f36051d47aaa5d4036ba1 /qobject/json-parser.c
parent83273e84d9646bb902e1debfdcb68c8afd38614f (diff)
downloadqemu-ada74c3ba1b4f51e4462e186c251eaa974015bb8.zip
json: Keep interpolation state in JSONParserContext
The recursive descent parser passes along a pointer to JSONParserContext. It additionally passes a pointer to interpolation state (a va_alist *) as needed to reach its consumer parse_interpolation(). Stuffing the latter pointer into JSONParserContext saves us the trouble of passing it along, so do that. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180823164025.12553-56-armbru@redhat.com>
Diffstat (limited to 'qobject/json-parser.c')
-rw-r--r--qobject/json-parser.c59
1 files changed, 30 insertions, 29 deletions
diff --git a/qobject/json-parser.c b/qobject/json-parser.c
index 7449684f1c..273f448a52 100644
--- a/qobject/json-parser.c
+++ b/qobject/json-parser.c
@@ -36,6 +36,7 @@ typedef struct JSONParserContext
Error *err;
JSONToken *current;
GQueue *buf;
+ va_list *ap;
} JSONParserContext;
#define BUG_ON(cond) assert(!(cond))
@@ -49,7 +50,7 @@ typedef struct JSONParserContext
* 4) deal with premature EOI
*/
-static QObject *parse_value(JSONParserContext *ctxt, va_list *ap);
+static QObject *parse_value(JSONParserContext *ctxt);
/**
* Error handler
@@ -243,7 +244,7 @@ static JSONToken *parser_context_peek_token(JSONParserContext *ctxt)
/**
* Parsing rules
*/
-static int parse_pair(JSONParserContext *ctxt, QDict *dict, va_list *ap)
+static int parse_pair(JSONParserContext *ctxt, QDict *dict)
{
QObject *value;
QString *key = NULL;
@@ -255,7 +256,7 @@ static int parse_pair(JSONParserContext *ctxt, QDict *dict, va_list *ap)
goto out;
}
- key = qobject_to(QString, parse_value(ctxt, ap));
+ key = qobject_to(QString, parse_value(ctxt));
if (!key) {
parse_error(ctxt, peek, "key is not a string in object");
goto out;
@@ -272,7 +273,7 @@ static int parse_pair(JSONParserContext *ctxt, QDict *dict, va_list *ap)
goto out;
}
- value = parse_value(ctxt, ap);
+ value = parse_value(ctxt);
if (value == NULL) {
parse_error(ctxt, token, "Missing value in dict");
goto out;
@@ -290,7 +291,7 @@ out:
return -1;
}
-static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
+static QObject *parse_object(JSONParserContext *ctxt)
{
QDict *dict = NULL;
JSONToken *token, *peek;
@@ -307,7 +308,7 @@ static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
}
if (peek->type != JSON_RCURLY) {
- if (parse_pair(ctxt, dict, ap) == -1) {
+ if (parse_pair(ctxt, dict) == -1) {
goto out;
}
@@ -323,7 +324,7 @@ static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
goto out;
}
- if (parse_pair(ctxt, dict, ap) == -1) {
+ if (parse_pair(ctxt, dict) == -1) {
goto out;
}
@@ -344,7 +345,7 @@ out:
return NULL;
}
-static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
+static QObject *parse_array(JSONParserContext *ctxt)
{
QList *list = NULL;
JSONToken *token, *peek;
@@ -363,7 +364,7 @@ static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
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;
@@ -383,7 +384,7 @@ static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
goto out;
}
- obj = parse_value(ctxt, ap);
+ obj = parse_value(ctxt);
if (obj == NULL) {
parse_error(ctxt, token, "expecting value");
goto out;
@@ -426,7 +427,7 @@ static QObject *parse_keyword(JSONParserContext *ctxt)
return NULL;
}
-static QObject *parse_interpolation(JSONParserContext *ctxt, va_list *ap)
+static QObject *parse_interpolation(JSONParserContext *ctxt)
{
JSONToken *token;
@@ -434,29 +435,29 @@ static QObject *parse_interpolation(JSONParserContext *ctxt, va_list *ap)
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)));
+ return QOBJECT(qnum_from_int(va_arg(*ctxt->ap, long)));
} else if (!strcmp(token->str, "%lld")) {
- return QOBJECT(qnum_from_int(va_arg(*ap, long long)));
+ return QOBJECT(qnum_from_int(va_arg(*ctxt->ap, long long)));
} else if (!strcmp(token->str, "%" PRId64)) {
- return QOBJECT(qnum_from_int(va_arg(*ap, int64_t)));
+ 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)));
+ return QOBJECT(qnum_from_uint(va_arg(*ctxt->ap, unsigned long)));
} else if (!strcmp(token->str, "%llu")) {
- return QOBJECT(qnum_from_uint(va_arg(*ap, unsigned long long)));
+ 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(*ap, uint64_t)));
+ 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;
@@ -514,7 +515,7 @@ static QObject *parse_literal(JSONParserContext *ctxt)
}
}
-static QObject *parse_value(JSONParserContext *ctxt, va_list *ap)
+static QObject *parse_value(JSONParserContext *ctxt)
{
JSONToken *token;
@@ -526,11 +527,11 @@ static QObject *parse_value(JSONParserContext *ctxt, va_list *ap)
switch (token->type) {
case JSON_LCURLY:
- return parse_object(ctxt, ap);
+ return parse_object(ctxt);
case JSON_LSQUARE:
- return parse_array(ctxt, ap);
+ return parse_array(ctxt);
case JSON_INTERP:
- return parse_interpolation(ctxt, ap);
+ return parse_interpolation(ctxt);
case JSON_INTEGER:
case JSON_FLOAT:
case JSON_STRING:
@@ -557,10 +558,10 @@ JSONToken *json_token(JSONTokenType type, int x, int y, GString *tokstr)
QObject *json_parser_parse(GQueue *tokens, va_list *ap, Error **errp)
{
- JSONParserContext ctxt = { .buf = tokens };
+ JSONParserContext ctxt = { .buf = tokens, .ap = ap };
QObject *result;
- result = parse_value(&ctxt, ap);
+ result = parse_value(&ctxt);
assert(ctxt.err || g_queue_is_empty(ctxt.buf));
error_propagate(errp, ctxt.err);