gparam.c

嵌入式下基于MiniGUI的Web Browser

      else if (!g_value_type_compatible (G_PARAM_SPEC_TYPE (param), G_VALUE_TYPE (value)))
	return g_strconcat ("invalid param spec type `",
			    G_PARAM_SPEC_TYPE_NAME (param),
			    "' for value type `",
			    G_VALUE_TYPE_NAME (value),
			    "'",
			    NULL);
      value->data[0].v_pointer = g_param_spec_ref (param);
    }
  else
    value->data[0].v_pointer = NULL;

  return NULL;
}

static gchar*
value_param_lcopy_value (const GValue *value,
			 guint         n_collect_values,
			 GTypeCValue  *collect_values,
			 guint         collect_flags)
{
  GParamSpec **param_p = collect_values[0].v_pointer;

  if (!param_p)
    return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value));

  if (!value->data[0].v_pointer)
    *param_p = NULL;
  else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
    *param_p = value->data[0].v_pointer;
  else
    *param_p = g_param_spec_ref (value->data[0].v_pointer);

  return NULL;
}


/* --- param spec pool --- */
struct _GParamSpecPool
{
  GStaticMutex smutex;
  gboolean     type_prefixing;
  GHashTable  *hash_table;
};

static guint
param_spec_pool_hash (gconstpointer key_spec)
{
  const GParamSpec *key = key_spec;
  const gchar *p;
  guint h = key->owner_type;

  for (p = key->name; *p; p++)
    h = (h << 5) - h + *p;

  return h;
}

static gboolean
param_spec_pool_equals (gconstpointer key_spec_1,
			gconstpointer key_spec_2)
{
  const GParamSpec *key1 = key_spec_1;
  const GParamSpec *key2 = key_spec_2;

  return (key1->owner_type == key2->owner_type &&
	  strcmp (key1->name, key2->name) == 0);
}

GParamSpecPool*
g_param_spec_pool_new (gboolean type_prefixing)
{
  static GStaticMutex init_smutex = G_STATIC_MUTEX_INIT;
  GParamSpecPool *pool = g_new (GParamSpecPool, 1);

  memcpy (&pool->smutex, &init_smutex, sizeof (init_smutex));
  pool->type_prefixing = type_prefixing != FALSE;
  pool->hash_table = g_hash_table_new (param_spec_pool_hash, param_spec_pool_equals);

  return pool;
}

void
g_param_spec_pool_insert (GParamSpecPool *pool,
			  GParamSpec     *pspec,
			  GType           owner_type)
{
  gchar *p;
  
  if (pool && pspec && owner_type > 0 && pspec->owner_type == 0)
    {
      G_SLOCK (&pool->smutex);
      for (p = pspec->name; *p; p++)
	{
	  if (!strchr (G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-_", *p))
	    {
	      g_warning (G_STRLOC ": pspec name \"%s\" contains invalid characters", pspec->name);
	      G_SUNLOCK (&pool->smutex);
	      return;
	    }
	}
      
      pspec->owner_type = owner_type;
      g_param_spec_ref (pspec);
      g_hash_table_insert (pool->hash_table, pspec, pspec);
      G_SUNLOCK (&pool->smutex);
    }
  else
    {
      g_return_if_fail (pool != NULL);
      g_return_if_fail (pspec);
      g_return_if_fail (owner_type > 0);
      g_return_if_fail (pspec->owner_type == 0);
    }
}

void
g_param_spec_pool_remove (GParamSpecPool *pool,
			  GParamSpec     *pspec)
{
  if (pool && pspec)
    {
      G_SLOCK (&pool->smutex);
      if (g_hash_table_remove (pool->hash_table, pspec))
	g_param_spec_unref (pspec);
      else
	g_warning (G_STRLOC ": attempt to remove unknown pspec `%s' from pool", pspec->name);
      G_SUNLOCK (&pool->smutex);
    }
  else
    {
      g_return_if_fail (pool != NULL);
      g_return_if_fail (pspec);
    }
}

static inline GParamSpec*
param_spec_ht_lookup (GHashTable  *hash_table,
		      const gchar *param_name,
		      GType        owner_type,
		      gboolean     walk_ancestors)
{
  GParamSpec key, *pspec;

  key.owner_type = owner_type;
  key.name = (gchar*) param_name;
  if (walk_ancestors)
    do
      {
	pspec = g_hash_table_lookup (hash_table, &key);
	if (pspec)
	  return pspec;
	key.owner_type = g_type_parent (key.owner_type);
      }
    while (key.owner_type);
  else
    pspec = g_hash_table_lookup (hash_table, &key);

  if (!pspec)
    {
      /* try canonicalized form */
      key.name = g_strdup (param_name);
      key.owner_type = owner_type;
      
      canonalize_key (key.name);
      if (walk_ancestors)
	do
	  {
	    pspec = g_hash_table_lookup (hash_table, &key);
	    if (pspec)
	      {
		g_free (key.name);
		return pspec;
	      }
	    key.owner_type = g_type_parent (key.owner_type);
	  }
	while (key.owner_type);
      else
	pspec = g_hash_table_lookup (hash_table, &key);
      g_free (key.name);
    }

  return pspec;
}

GParamSpec*
g_param_spec_pool_lookup (GParamSpecPool *pool,
			  const gchar    *param_name,
			  GType           owner_type,
			  gboolean        walk_ancestors)
{
  GParamSpec *pspec;
  gchar *delim;

  if (!pool || !param_name)
    {
      g_return_val_if_fail (pool != NULL, NULL);
      g_return_val_if_fail (param_name != NULL, NULL);
    }

  G_SLOCK (&pool->smutex);

  delim = pool->type_prefixing ? strchr (param_name, ':') : NULL;

  /* try quick and away, i.e. without prefix */
  if (!delim)
    {
      pspec = param_spec_ht_lookup (pool->hash_table, param_name, owner_type, walk_ancestors);
      G_SUNLOCK (&pool->smutex);

      return pspec;
    }

  /* strip type prefix */
  if (pool->type_prefixing && delim[1] == ':')
    {
      guint l = delim - param_name;
      gchar stack_buffer[32], *buffer = l < 32 ? stack_buffer : g_new (gchar, l + 1);
      GType type;
      
      strncpy (buffer, param_name, delim - param_name);
      buffer[l] = 0;
      type = g_type_from_name (buffer);
      if (l >= 32)
	g_free (buffer);
      if (type)		/* type==0 isn't a valid type pefix */
	{
	  /* sanity check, these cases don't make a whole lot of sense */
	  if ((!walk_ancestors && type != owner_type) || !g_type_is_a (owner_type, type))
	    {
	      G_SUNLOCK (&pool->smutex);

	      return NULL;
	    }
	  owner_type = type;
	  param_name += l + 2;
	  pspec = param_spec_ht_lookup (pool->hash_table, param_name, owner_type, walk_ancestors);
	  G_SUNLOCK (&pool->smutex);

	  return pspec;
	}
    }
  /* malformed param_name */

  G_SUNLOCK (&pool->smutex);

  return NULL;
}

static void
pool_list (gpointer key,
	   gpointer value,
	   gpointer user_data)
{
  GParamSpec *pspec = value;
  gpointer *data = user_data;
  GType owner_type = (GType) data[1];

  if (owner_type == pspec->owner_type)
    data[0] = g_list_prepend (data[0], pspec);
}

GList*
g_param_spec_pool_list_owned (GParamSpecPool *pool,
			      GType           owner_type)
{
  gpointer data[2];

  g_return_val_if_fail (pool != NULL, NULL);
  g_return_val_if_fail (owner_type > 0, NULL);
  
  G_SLOCK (&pool->smutex);
  data[0] = NULL;
  data[1] = (gpointer) owner_type;
  g_hash_table_foreach (pool->hash_table, pool_list, &data);
  G_SUNLOCK (&pool->smutex);

  return data[0];
}

static gint
pspec_compare_id (gconstpointer a,
		  gconstpointer b)
{
  const GParamSpec *pspec1 = a, *pspec2 = b;

  return pspec1->param_id < pspec2->param_id ? -1 : pspec1->param_id > pspec2->param_id;
}

static inline GSList*
pspec_list_remove_overridden (GSList     *plist,
			      GHashTable *ht,
			      GType       owner_type,
			      guint      *n_p)
{
  GSList *rlist = NULL;

  while (plist)
    {
      GSList *tmp = plist->next;
      GParamSpec *pspec = plist->data;

      if (param_spec_ht_lookup (ht, pspec->name, owner_type, TRUE) != pspec)
	g_slist_free_1 (plist);
      else
	{
	  plist->next = rlist;
	  rlist = plist;
	  *n_p += 1;
	}
      plist = tmp;
    }
  return rlist;
}

static void
pool_depth_list (gpointer key,
		 gpointer value,
		 gpointer user_data)
{
  GParamSpec *pspec = value;
  gpointer *data = user_data;
  GSList **slists = data[0];
  GType owner_type = (GType) data[1];

  if (g_type_is_a (owner_type, pspec->owner_type))
    {
      guint d = g_type_depth (pspec->owner_type);

      slists[d - 1] = g_slist_prepend (slists[d - 1], pspec);
    }
}

GParamSpec** /* free result */
g_param_spec_pool_list (GParamSpecPool *pool,
			GType           owner_type,
			guint          *n_pspecs_p)
{
  GParamSpec **pspecs, **p;
  GSList **slists, *node;
  gpointer data[2];
  guint d, i;

  g_return_val_if_fail (pool != NULL, NULL);
  g_return_val_if_fail (owner_type > 0, NULL);
  g_return_val_if_fail (n_pspecs_p != NULL, NULL);
  
  G_SLOCK (&pool->smutex);
  *n_pspecs_p = 0;
  d = g_type_depth (owner_type);
  slists = g_new0 (GSList*, d);
  data[0] = slists;
  data[1] = (gpointer) owner_type;
  g_hash_table_foreach (pool->hash_table, pool_depth_list, &data);
  for (i = 0; i < d - 1; i++)
    slists[i] = pspec_list_remove_overridden (slists[i], pool->hash_table, owner_type, n_pspecs_p);
  *n_pspecs_p += g_slist_length (slists[i]);
  pspecs = g_new (GParamSpec*, *n_pspecs_p + 1);
  p = pspecs;
  for (i = 0; i < d; i++)
    {
      slists[i] = g_slist_sort (slists[i], pspec_compare_id);
      for (node = slists[i]; node; node = node->next)
	*p++ = node->data;
      g_slist_free (slists[i]);
    }
  *p++ = NULL;
  g_free (slists);
  G_SUNLOCK (&pool->smutex);

  return pspecs;
}


/* --- auxillary functions --- */
typedef struct
{
  /* class portion */
  GType           value_type;
  void          (*finalize)             (GParamSpec   *pspec);
  void          (*value_set_default)    (GParamSpec   *pspec,
					 GValue       *value);
  gboolean      (*value_validate)       (GParamSpec   *pspec,
					 GValue       *value);
  gint          (*values_cmp)           (GParamSpec   *pspec,
					 const GValue *value1,
					 const GValue *value2);
} ParamSpecClassInfo;

static void
param_spec_generic_class_init (gpointer g_class,
			       gpointer class_data)
{
  GParamSpecClass *class = g_class;
  ParamSpecClassInfo *info = class_data;

  class->value_type = info->value_type;
  if (info->finalize)
    class->finalize = info->finalize;			/* optional */
  class->value_set_default = info->value_set_default;
  if (info->value_validate)
    class->value_validate = info->value_validate;	/* optional */
  class->values_cmp = info->values_cmp;
  g_free (class_data);
}

static void
default_value_set_default (GParamSpec *pspec,
			   GValue     *value)
{
  /* value is already zero initialized */
}

static gint
default_values_cmp (GParamSpec   *pspec,
		    const GValue *value1,
		    const GValue *value2)
{
  return memcmp (&value1->data, &value2->data, sizeof (value1->data));
}

GType
g_param_type_register_static (const gchar              *name,
			      const GParamSpecTypeInfo *pspec_info)
{
  GTypeInfo info = {
    sizeof (GParamSpecClass),      /* class_size */
    NULL,                          /* base_init */
    NULL,                          /* base_destroy */
    param_spec_generic_class_init, /* class_init */
    NULL,                          /* class_destroy */
    NULL,                          /* class_data */
    0,                             /* instance_size */
    16,                            /* n_preallocs */
    NULL,                          /* instance_init */
  };
  ParamSpecClassInfo *cinfo;

  g_return_val_if_fail (name != NULL, 0);
  g_return_val_if_fail (pspec_info != NULL, 0);
  g_return_val_if_fail (g_type_from_name (name) == 0, 0);
  g_return_val_if_fail (pspec_info->instance_size >= sizeof (GParamSpec), 0);
  g_return_val_if_fail (g_type_name (pspec_info->value_type) != NULL, 0);
  /* default: g_return_val_if_fail (pspec_info->value_set_default != NULL, 0); */
  /* optional: g_return_val_if_fail (pspec_info->value_validate != NULL, 0); */
  /* default: g_return_val_if_fail (pspec_info->values_cmp != NULL, 0); */

  info.instance_size = pspec_info->instance_size;
  info.n_preallocs = pspec_info->n_preallocs;
  info.instance_init = (GInstanceInitFunc) pspec_info->instance_init;
  cinfo = g_new (ParamSpecClassInfo, 1);
  cinfo->value_type = pspec_info->value_type;
  cinfo->finalize = pspec_info->finalize;
  cinfo->value_set_default = pspec_info->value_set_default ? pspec_info->value_set_default : default_value_set_default;
  cinfo->value_validate = pspec_info->value_validate;
  cinfo->values_cmp = pspec_info->values_cmp ? pspec_info->values_cmp : default_values_cmp;
  info.class_data = cinfo;

  return g_type_register_static (G_TYPE_PARAM, name, &info, 0);
}

void
g_value_set_param (GValue     *value,
		   GParamSpec *param)
{
  g_return_if_fail (G_VALUE_HOLDS_PARAM (value));
  if (param)
    g_return_if_fail (G_IS_PARAM_SPEC (param));

  if (value->data[0].v_pointer)
    g_param_spec_unref (value->data[0].v_pointer);
  value->data[0].v_pointer = param;
  if (value->data[0].v_pointer)
    g_param_spec_ref (value->data[0].v_pointer);
}

void
g_value_set_param_take_ownership (GValue     *value,
				  GParamSpec *param)
{
  g_return_if_fail (G_VALUE_HOLDS_PARAM (value));
  if (param)
    g_return_if_fail (G_IS_PARAM_SPEC (param));

  if (value->data[0].v_pointer)
    g_param_spec_unref (value->data[0].v_pointer);
  value->data[0].v_pointer = param; /* we take over the reference count */
}

GParamSpec*
g_value_get_param (const GValue *value)
{
  g_return_val_if_fail (G_VALUE_HOLDS_PARAM (value), NULL);

  return value->data[0].v_pointer;
}

GParamSpec*
g_value_dup_param (const GValue *value)
{
  g_return_val_if_fail (G_VALUE_HOLDS_PARAM (value), NULL);

  return value->data[0].v_pointer ? g_param_spec_ref (value->data[0].v_pointer) : NULL;
}