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json: Keep interpolation state in JSONParserContext

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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>
This commit is contained in:
Markus Armbruster 2018-08-23 18:40:22 +02:00
parent 83273e84d9
commit ada74c3ba1
1 changed files with 30 additions and 29 deletions
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59
qobject/json-parser.c
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@ -36,6 +36,7 @@ typedef struct JSONParserContext
Error *err; Error *err;
JSONToken *current; JSONToken *current;
GQueue *buf; GQueue *buf;
va_list *ap;
} JSONParserContext; } JSONParserContext;
#define BUG_ON(cond) assert(!(cond)) #define BUG_ON(cond) assert(!(cond))
@ -49,7 +50,7 @@ typedef struct JSONParserContext
* 4) deal with premature EOI * 4) deal with premature EOI
*/ */
static QObject *parse_value(JSONParserContext *ctxt, va_list *ap); static QObject *parse_value(JSONParserContext *ctxt);
/** /**
* Error handler * Error handler
@ -243,7 +244,7 @@ static JSONToken *parser_context_peek_token(JSONParserContext *ctxt)
/** /**
* Parsing rules * Parsing rules
*/ */
static int parse_pair(JSONParserContext *ctxt, QDict *dict, va_list *ap) static int parse_pair(JSONParserContext *ctxt, QDict *dict)
{ {
QObject *value; QObject *value;
QString *key = NULL; QString *key = NULL;
@ -255,7 +256,7 @@ static int parse_pair(JSONParserContext *ctxt, QDict *dict, va_list *ap)
goto out; goto out;
} }
key = qobject_to(QString, parse_value(ctxt, ap)); key = qobject_to(QString, parse_value(ctxt));
if (!key) { if (!key) {
parse_error(ctxt, peek, "key is not a string in object"); parse_error(ctxt, peek, "key is not a string in object");
goto out; goto out;
@ -272,7 +273,7 @@ static int parse_pair(JSONParserContext *ctxt, QDict *dict, va_list *ap)
goto out; goto out;
} }
value = parse_value(ctxt, ap); value = parse_value(ctxt);
if (value == NULL) { if (value == NULL) {
parse_error(ctxt, token, "Missing value in dict"); parse_error(ctxt, token, "Missing value in dict");
goto out; goto out;
@ -290,7 +291,7 @@ out:
return -1; return -1;
} }
static QObject *parse_object(JSONParserContext *ctxt, va_list *ap) static QObject *parse_object(JSONParserContext *ctxt)
{ {
QDict *dict = NULL; QDict *dict = NULL;
JSONToken *token, *peek; JSONToken *token, *peek;
@ -307,7 +308,7 @@ static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
} }
if (peek->type != JSON_RCURLY) { if (peek->type != JSON_RCURLY) {
if (parse_pair(ctxt, dict, ap) == -1) { if (parse_pair(ctxt, dict) == -1) {
goto out; goto out;
} }
@ -323,7 +324,7 @@ static QObject *parse_object(JSONParserContext *ctxt, va_list *ap)
goto out; goto out;
} }
if (parse_pair(ctxt, dict, ap) == -1) { if (parse_pair(ctxt, dict) == -1) {
goto out; goto out;
} }
@ -344,7 +345,7 @@ out:
return NULL; return NULL;
} }
static QObject *parse_array(JSONParserContext *ctxt, va_list *ap) static QObject *parse_array(JSONParserContext *ctxt)
{ {
QList *list = NULL; QList *list = NULL;
JSONToken *token, *peek; JSONToken *token, *peek;
@ -363,7 +364,7 @@ static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
if (peek->type != JSON_RSQUARE) { if (peek->type != JSON_RSQUARE) {
QObject *obj; QObject *obj;
obj = parse_value(ctxt, ap); obj = parse_value(ctxt);
if (obj == NULL) { if (obj == NULL) {
parse_error(ctxt, token, "expecting value"); parse_error(ctxt, token, "expecting value");
goto out; goto out;
@ -383,7 +384,7 @@ static QObject *parse_array(JSONParserContext *ctxt, va_list *ap)
goto out; goto out;
} }
obj = parse_value(ctxt, ap); obj = parse_value(ctxt);
if (obj == NULL) { if (obj == NULL) {
parse_error(ctxt, token, "expecting value"); parse_error(ctxt, token, "expecting value");
goto out; goto out;
@ -426,7 +427,7 @@ static QObject *parse_keyword(JSONParserContext *ctxt)
return NULL; return NULL;
} }
static QObject *parse_interpolation(JSONParserContext *ctxt, va_list *ap) static QObject *parse_interpolation(JSONParserContext *ctxt)
{ {
JSONToken *token; JSONToken *token;
@ -434,29 +435,29 @@ static QObject *parse_interpolation(JSONParserContext *ctxt, va_list *ap)
assert(token && token->type == JSON_INTERP); assert(token && token->type == JSON_INTERP);
if (!strcmp(token->str, "%p")) { if (!strcmp(token->str, "%p")) {
return va_arg(*ap, QObject *); return va_arg(*ctxt->ap, QObject *);
} else if (!strcmp(token->str, "%i")) { } 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")) { } 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")) { } 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")) { } 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)) { } 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")) { } 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")) { } 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")) { } 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)) { } 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")) { } 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")) { } 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); parse_error(ctxt, token, "invalid interpolation '%s'", token->str);
return NULL; 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; JSONToken *token;
@ -526,11 +527,11 @@ static QObject *parse_value(JSONParserContext *ctxt, va_list *ap)
switch (token->type) { switch (token->type) {
case JSON_LCURLY: case JSON_LCURLY:
return parse_object(ctxt, ap); return parse_object(ctxt);
case JSON_LSQUARE: case JSON_LSQUARE:
return parse_array(ctxt, ap); return parse_array(ctxt);
case JSON_INTERP: case JSON_INTERP:
return parse_interpolation(ctxt, ap); return parse_interpolation(ctxt);
case JSON_INTEGER: case JSON_INTEGER:
case JSON_FLOAT: case JSON_FLOAT:
case JSON_STRING: 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) QObject *json_parser_parse(GQueue *tokens, va_list *ap, Error **errp)
{ {
JSONParserContext ctxt = { .buf = tokens }; JSONParserContext ctxt = { .buf = tokens, .ap = ap };
QObject *result; QObject *result;
result = parse_value(&ctxt, ap); result = parse_value(&ctxt);
assert(ctxt.err || g_queue_is_empty(ctxt.buf)); assert(ctxt.err || g_queue_is_empty(ctxt.buf));
error_propagate(errp, ctxt.err); error_propagate(errp, ctxt.err);