603476c25c
The qdict_flatten() method will take a dict whose elements are
further nested dicts/lists and flatten them by concatenating
keys.
The qdict_crumple() method aims to do the reverse, taking a flat
qdict, and turning it into a set of nested dicts/lists. It will
apply nesting based on the key name, with a '.' indicating a
new level in the hierarchy. If the keys in the nested structure
are all numeric, it will create a list, otherwise it will create
a dict.
If the keys are a mixture of numeric and non-numeric, or the
numeric keys are not in strictly ascending order, an error will
be reported.
As an example, a flat dict containing
{
'foo.0.bar': 'one',
'foo.0.wizz': '1',
'foo.1.bar': 'two',
'foo.1.wizz': '2'
}
will get turned into a dict with one element 'foo' whose
value is a list. The list elements will each in turn be
dicts.
{
'foo': [
{ 'bar': 'one', 'wizz': '1' },
{ 'bar': 'two', 'wizz': '2' }
],
}
If the key is intended to contain a literal '.', then it must
be escaped as '..'. ie a flat dict
{
'foo..bar': 'wizz',
'bar.foo..bar': 'eek',
'bar.hello': 'world'
}
Will end up as
{
'foo.bar': 'wizz',
'bar': {
'foo.bar': 'eek',
'hello': 'world'
}
}
The intent of this function is that it allows a set of QemuOpts
to be turned into a nested data structure that mirrors the nesting
used when the same object is defined over QMP.
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1475246744-29302-3-git-send-email-berrange@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Parameter recursive dropped along with its tests; whitespace style
touched up]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
/*
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* QDict Module
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* Authors:
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* Luiz Capitulino <lcapitulino@redhat.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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#ifndef QDICT_H
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#define QDICT_H
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#include "qapi/qmp/qobject.h"
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#include "qapi/qmp/qlist.h"
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#include "qemu/queue.h"
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#define QDICT_BUCKET_MAX 512
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typedef struct QDictEntry {
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char *key;
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QObject *value;
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QLIST_ENTRY(QDictEntry) next;
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} QDictEntry;
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typedef struct QDict {
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QObject base;
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size_t size;
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QLIST_HEAD(,QDictEntry) table[QDICT_BUCKET_MAX];
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} QDict;
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/* Object API */
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QDict *qdict_new(void);
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const char *qdict_entry_key(const QDictEntry *entry);
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QObject *qdict_entry_value(const QDictEntry *entry);
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size_t qdict_size(const QDict *qdict);
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void qdict_put_obj(QDict *qdict, const char *key, QObject *value);
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void qdict_del(QDict *qdict, const char *key);
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int qdict_haskey(const QDict *qdict, const char *key);
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QObject *qdict_get(const QDict *qdict, const char *key);
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QDict *qobject_to_qdict(const QObject *obj);
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void qdict_iter(const QDict *qdict,
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void (*iter)(const char *key, QObject *obj, void *opaque),
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void *opaque);
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const QDictEntry *qdict_first(const QDict *qdict);
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const QDictEntry *qdict_next(const QDict *qdict, const QDictEntry *entry);
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void qdict_destroy_obj(QObject *obj);
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/* Helper to qdict_put_obj(), accepts any object */
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#define qdict_put(qdict, key, obj) \
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qdict_put_obj(qdict, key, QOBJECT(obj))
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/* High level helpers */
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double qdict_get_double(const QDict *qdict, const char *key);
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int64_t qdict_get_int(const QDict *qdict, const char *key);
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bool qdict_get_bool(const QDict *qdict, const char *key);
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QList *qdict_get_qlist(const QDict *qdict, const char *key);
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QDict *qdict_get_qdict(const QDict *qdict, const char *key);
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const char *qdict_get_str(const QDict *qdict, const char *key);
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int64_t qdict_get_try_int(const QDict *qdict, const char *key,
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int64_t def_value);
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bool qdict_get_try_bool(const QDict *qdict, const char *key, bool def_value);
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const char *qdict_get_try_str(const QDict *qdict, const char *key);
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void qdict_copy_default(QDict *dst, QDict *src, const char *key);
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void qdict_set_default_str(QDict *dst, const char *key, const char *val);
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QDict *qdict_clone_shallow(const QDict *src);
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void qdict_flatten(QDict *qdict);
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void qdict_extract_subqdict(QDict *src, QDict **dst, const char *start);
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void qdict_array_split(QDict *src, QList **dst);
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int qdict_array_entries(QDict *src, const char *subqdict);
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QObject *qdict_crumple(const QDict *src, Error **errp);
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void qdict_join(QDict *dest, QDict *src, bool overwrite);
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#endif /* QDICT_H */
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