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cssimage: Add _gtk_css_image_can_parse()

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Looks at the first token of the stream to see if this looks like an
image declaration. If it does: return %TRUE.
This commit is contained in:
Benjamin Otte 2012-01-04 18:42:38 +01:00
parent 4b7ca9602d
commit a43553ab86
2 changed files with 52 additions and 23 deletions
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74
gtk/gtkcssimage.c
View File

@ -313,9 +313,8 @@ _gtk_css_image_get_surface (GtkCssImage *image,
return result;
}
GtkCssImage *
_gtk_css_image_new_parse (GtkCssParser *parser,
GFile *base)
GType
gtk_css_image_get_parser_type (GtkCssParser *parser)
{
static const struct {
const char *prefix;
@ -327,30 +326,59 @@ _gtk_css_image_new_parse (GtkCssParser *parser,
};
guint i;
g_return_val_if_fail (parser != NULL, NULL);
g_return_val_if_fail (G_IS_FILE (base), NULL);
for (i = 0; i < G_N_ELEMENTS (image_types); i++)
{
if (_gtk_css_parser_has_prefix (parser, image_types[i].prefix))
{
GtkCssImage *image;
GtkCssImageClass *klass;
image = g_object_new (image_types[i].type_func (), NULL);
klass = GTK_CSS_IMAGE_GET_CLASS (image);
if (!klass->parse (image, parser, base))
{
g_object_unref (image);
return NULL;
}
return image;
}
return image_types[i].type_func ();
}
_gtk_css_parser_error (parser, "Not a valid image");
return NULL;
return G_TYPE_INVALID;
}
/**
* _gtk_css_image_can_parse:
* @parser: a css parser
*
* Checks if the parser can potentially parse the given stream as an
* image from looking at the first token of @parser. This is useful for
* implementing shorthand properties. A successful parse of an image
* can not be guaranteed.
*
* Returns: %TURE if it looks like an image.
**/
gboolean
_gtk_css_image_can_parse (GtkCssParser *parser)
{
return gtk_css_image_get_parser_type (parser) != G_TYPE_INVALID;
}
GtkCssImage *
_gtk_css_image_new_parse (GtkCssParser *parser,
GFile *base)
{
GtkCssImageClass *klass;
GtkCssImage *image;
GType image_type;
g_return_val_if_fail (parser != NULL, NULL);
g_return_val_if_fail (G_IS_FILE (base), NULL);
image_type = gtk_css_image_get_parser_type (parser);
if (image_type == G_TYPE_INVALID)
{
_gtk_css_parser_error (parser, "Not a valid image");
return NULL;
}
image = g_object_new (image_type, NULL);
klass = GTK_CSS_IMAGE_GET_CLASS (image);
if (!klass->parse (image, parser, base))
{
g_object_unref (image);
return NULL;
}
return image;
}

1
gtk/gtkcssimageprivate.h
View File

@ -75,6 +75,7 @@ struct _GtkCssImageClass
GType _gtk_css_image_get_type (void) G_GNUC_CONST;
gboolean _gtk_css_image_can_parse (GtkCssParser *parser);
GtkCssImage * _gtk_css_image_new_parse (GtkCssParser *parser,
GFile *base);