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qobject: Factor JSON writer out of qobject_to_json()

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We have two JSON writers written in C: qobject/qjson.c provides
qobject_to_json(), and migration/qjson.c provides a more low level
imperative interface.  They don't share code.  The latter tacitly
limits numbers to int64_t, and strings contents to characters that
don't need escaping.

Factor out qobject_to_json()'s JSON writer as qobject/json-writer.c.
Straightforward, except for numbers: since the writer is to be
independent of QObject, it can't use qnum_to_string().  Open-code it
instead.  This is actually an improvement of sorts, because it
liberates qnum_to_string() from JSON's needs: its JSON-related FIXMEs
move to the JSON writer, where they belong.

The next commit will replace migration/qjson.c.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201211171152.146877-16-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2020-12-11 18:11:47 +01:00
parent 91f54d92c7
commit 998da0b158
5 changed files with 318 additions and 101 deletions
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37
include/qapi/qmp/json-writer.h Normal file
View file

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/*
* JSON Writer
*
* Copyright (c) 2020 Red Hat Inc.
*
* Authors:
* Markus Armbruster <armbru@redhat.com>
*
* 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.
*
*/
#ifndef JSON_WRITER_H
#define JSON_WRITER_H
typedef struct JSONWriter JSONWriter;
JSONWriter *json_writer_new(bool pretty);
const char *json_writer_get(JSONWriter *);
GString *json_writer_get_and_free(JSONWriter *);
void json_writer_free(JSONWriter *);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(JSONWriter, json_writer_free)
void json_writer_start_object(JSONWriter *, const char *name);
void json_writer_end_object(JSONWriter *);
void json_writer_start_array(JSONWriter *, const char *name);
void json_writer_end_array(JSONWriter *);
void json_writer_bool(JSONWriter *, const char *name, bool val);
void json_writer_null(JSONWriter *, const char *name);
void json_writer_int64(JSONWriter *, const char *name, int64_t val);
void json_writer_uint64(JSONWriter *, const char *name, uint64_t val);
void json_writer_double(JSONWriter *, const char *name, double val);
void json_writer_str(JSONWriter *, const char *name, const char *str);
#endif