diff options
Diffstat (limited to 'src/ui/theme-parser.c')
| -rw-r--r-- | src/ui/theme-parser.c | 270 |
1 files changed, 243 insertions, 27 deletions
diff --git a/src/ui/theme-parser.c b/src/ui/theme-parser.c index 2a01fd1d..a2225427 100644 --- a/src/ui/theme-parser.c +++ b/src/ui/theme-parser.c @@ -27,6 +27,22 @@ #include <string.h> #include <stdlib.h> +/* We were intending to put the version number + * in the subdirectory name, but we ended up + * using the filename instead. The "-1" survives + * as a fossil. + */ +#define THEME_SUBDIR "metacity-1" + +/* Highest version of the theme format to + * look out for. + */ +#define THEME_MAJOR_VERSION 3 +#define THEME_MINOR_VERSION 0 +#define THEME_VERSION (1000 * THEME_MAJOR_VERSION + THEME_MINOR_VERSION) + +#define MARCO_THEME_FILENAME_FORMAT "metacity-theme-%d.xml" + typedef enum { STATE_START, @@ -81,11 +97,15 @@ typedef enum typedef struct { + /* This two lists contain stacks of state and required version + * (cast to pointers.) There is one list item for each currently + * open element. */ GSList *states; + GSList *required_versions; const char *theme_name; /* name of theme (directory it's in) */ - const char *theme_file; /* theme filename */ - const char *theme_dir; /* dir the theme is inside */ + const char *theme_file; /* theme filename */ + const char *theme_dir; /* dir the theme is inside */ MetaTheme *theme; /* theme being parsed */ guint format_version; /* version of format of theme file */ char *name; /* name of named thing being parsed */ @@ -97,8 +117,22 @@ typedef struct MetaFramePiece piece; /* position of piece being parsed */ MetaButtonType button_type; /* type of button/menuitem being parsed */ MetaButtonState button_state; /* state of button being parsed */ + int skip_level; /* depth of elements that we're ignoring */ } ParseInfo; +typedef enum { + THEME_PARSE_ERROR_TOO_OLD, + THEME_PARSE_ERROR_TOO_FAILED + } ThemeParseError; + +static GQuark +theme_parse_error_quark (void) +{ + return g_quark_from_static_string ("theme-parse-error-quark"); +} + +#define THEME_PARSE_ERROR (theme_parse_error_quark ()) + static void set_error (GError **err, GMarkupParseContext *context, int error_domain, @@ -273,6 +307,7 @@ parse_info_init (ParseInfo *info) { info->theme_file = NULL; info->states = g_slist_prepend (NULL, GINT_TO_POINTER (STATE_START)); + info->required_versions = NULL; info->theme = NULL; info->name = NULL; info->layout = NULL; @@ -283,12 +318,14 @@ parse_info_init (ParseInfo *info) info->piece = META_FRAME_PIECE_LAST; info->button_type = META_BUTTON_TYPE_LAST; info->button_state = META_BUTTON_STATE_LAST; + info->skip_level = 0; } static void parse_info_free (ParseInfo *info) { g_slist_free (info->states); + g_slist_free (info->required_versions); if (info->theme) meta_theme_free (info->theme); @@ -332,6 +369,31 @@ peek_state (ParseInfo *info) return GPOINTER_TO_INT (info->states->data); } +static void +push_required_version (ParseInfo *info, + int version) +{ + info->required_versions = g_slist_prepend (info->required_versions, + GINT_TO_POINTER (version)); +} + +static void +pop_required_version (ParseInfo *info) +{ + g_return_if_fail (info->required_versions != NULL); + + info->required_versions = g_slist_delete_link (info->required_versions, info->required_versions); +} + +static int +peek_required_version (ParseInfo *info) +{ + if (info->required_versions) + return GPOINTER_TO_INT (info->required_versions->data); + else + return info->format_version; +} + #define ELEMENT_IS(name) (strcmp (element_name, (name)) == 0) typedef struct @@ -413,6 +475,13 @@ locate_attributes (GMarkupParseContext *context, int j; gboolean found; + /* Can be present anywhere */ + if (strcmp (attribute_names[i], "version") == 0) + { + ++i; + continue; + } + found = FALSE; j = 0; while (j < n_attrs) @@ -489,7 +558,13 @@ check_no_attributes (GMarkupParseContext *context, const char **attribute_values, GError **error) { - if (attribute_names[0] != NULL) + int i = 0; + + /* Can be present anywhere */ + if (attribute_names[0] && strcmp (attribute_names[i], "version") == 0) + i++; + + if (attribute_names[i] != NULL) { set_error (error, context, G_MARKUP_ERROR, @@ -3354,6 +3429,89 @@ parse_menu_icon_element (GMarkupParseContext *context, } } +static const char * +find_version (const char **attribute_names, + const char **attribute_values) +{ + int i; + + for (i = 0; attribute_names[i]; i++) + { + if (strcmp (attribute_names[i], "version") == 0) + return attribute_values[i]; + } + + return NULL; +} + +/* Returns whether the version element was successfully parsed. + * If successfully parsed, then two additional items are returned: + * + * satisfied: whether this version of Mutter meets the version check + * minimum_required: minimum version of theme format required by version check + */ +static gboolean +check_version (GMarkupParseContext *context, + const char *version_str, + gboolean *satisfied, + guint *minimum_required, + GError **error) +{ + static GRegex *version_regex; + GMatchInfo *info; + char *comparison_str, *major_str, *minor_str; + guint version; + + *minimum_required = 0; + + if (!version_regex) + version_regex = g_regex_new ("^\\s*([<>]=?)\\s*(\\d+)(\\.\\d+)?\\s*$", 0, 0, NULL); + + if (!g_regex_match (version_regex, version_str, 0, &info)) + { + g_match_info_free (info); + set_error (error, context, G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE, + _("Bad version specification '%s'"), version_str); + return FALSE; + } + + comparison_str = g_match_info_fetch (info, 1); + major_str = g_match_info_fetch (info, 2); + minor_str = g_match_info_fetch (info, 3); + + version = 1000 * atoi (major_str); + /* might get NULL, see: https://bugzilla.gnome.org/review?bug=588217 */ + if (minor_str && minor_str[0]) + version += atoi (minor_str + 1); + + if (comparison_str[0] == '<') + { + if (comparison_str[1] == '=') + *satisfied = THEME_VERSION <= version; + else + *satisfied = THEME_VERSION < version; + } + else + { + if (comparison_str[1] == '=') + { + *satisfied = THEME_VERSION >= version; + *minimum_required = version; + } + else + { + *satisfied = THEME_VERSION > version; + *minimum_required = version + 1; + } + } + + g_free (comparison_str); + g_free (major_str); + g_free (minor_str); + g_match_info_free (info); + + return TRUE; +} static void start_element_handler (GMarkupParseContext *context, @@ -3364,6 +3522,65 @@ start_element_handler (GMarkupParseContext *context, GError **error) { ParseInfo *info = user_data; + const char *version; + guint required_version = 0; + + if (info->skip_level > 0) + { + info->skip_level++; + return; + } + + required_version = peek_required_version (info); + + version = find_version (attribute_names, attribute_values); + if (version != NULL) + { + gboolean satisfied; + guint element_required; + + if (required_version < 3000) + { + set_error (error, context, G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE, + _("\"version\" attribute cannot be used in metacity-theme-1.xml or metacity-theme-2.xml")); + return; + } + + if (!check_version (context, version, &satisfied, &element_required, error)) + return; + + /* Two different ways of handling an unsatisfied version check: + * for the toplevel element of a file, we throw an error back so + * that the controlling code can go ahead and look for an + * alternate metacity-theme-1.xml or metacity-theme-2.xml; for + * other elements we just silently skip the element and children. + */ + if (peek_state (info) == STATE_START) + { + if (satisfied) + { + if (element_required > info->format_version) + info->format_version = element_required; + } + else + { + set_error (error, context, THEME_PARSE_ERROR, THEME_PARSE_ERROR_TOO_OLD, + _("Theme requires version %s but latest supported theme version is %d.%d"), + version, THEME_VERSION, THEME_MINOR_VERSION); + return; + } + } + else if (!satisfied) + { + info->skip_level = 1; + return; + } + + if (element_required > required_version) + required_version = element_required; + } + + push_required_version (info, required_version); switch (peek_state (info)) { @@ -3513,6 +3730,12 @@ end_element_handler (GMarkupParseContext *context, { ParseInfo *info = user_data; + if (info->skip_level > 0) + { + info->skip_level--; + return; + } + switch (peek_state (info)) { case STATE_START: @@ -3794,6 +4017,8 @@ end_element_handler (GMarkupParseContext *context, g_assert (peek_state (info) == STATE_THEME); break; } + + pop_required_version (info); } #define NO_TEXT(element_name) set_error (error, context, G_MARKUP_ERROR, G_MARKUP_ERROR_PARSE, _("No text is allowed inside element <%s>"), element_name) @@ -3828,6 +4053,9 @@ text_handler (GMarkupParseContext *context, { ParseInfo *info = user_data; + if (info->skip_level > 0) + return; + if (all_whitespace (text, text_len)) return; @@ -4002,27 +4230,15 @@ text_handler (GMarkupParseContext *context, } } -/* We were intending to put the version number - * in the subdirectory name, but we ended up - * using the filename instead. The "-1" survives - * as a fossil. - */ -#define THEME_SUBDIR "metacity-1" - -/* Highest version of the theme format to - * look out for. - */ -#define THEME_VERSION 2 - -#define MARCO_THEME_FILENAME_FORMAT "metacity-theme-%d.xml" - /* If the theme is not-corrupt, keep looking for alternate versions * in other locations we might be compatible with */ static gboolean theme_error_is_fatal (GError *error) { - return error->domain != G_FILE_ERROR; + return !(error->domain == G_FILE_ERROR || + (error->domain == THEME_PARSE_ERROR && + error->code == THEME_PARSE_ERROR_TOO_OLD)); } static MetaTheme* @@ -4059,7 +4275,7 @@ load_theme (const char *theme_dir, info.theme_file = theme_file; info.theme_dir = theme_dir; - info.format_version = major_version; + info.format_version = 1000 * major_version; context = g_markup_parse_context_new (&marco_theme_parser, 0, &info, NULL); @@ -4110,7 +4326,7 @@ meta_theme_load (const char *theme_name, char *theme_dir; MetaTheme *retval; const gchar* const* xdg_data_dirs; - int version; + int major_version; int i; retval = NULL; @@ -4118,10 +4334,10 @@ meta_theme_load (const char *theme_name, if (meta_is_debugging ()) { /* We try all supported major versions from current to oldest */ - for (version = THEME_VERSION; (version > 0); version--) + for (major_version = THEME_MAJOR_VERSION; (major_version > 0); major_version--) { theme_dir = g_build_filename ("./themes", theme_name, NULL); - retval = load_theme (theme_dir, theme_name, version, &error); + retval = load_theme (theme_dir, theme_name, major_version, &error); if (!keep_trying (&error)) goto out; @@ -4129,7 +4345,7 @@ meta_theme_load (const char *theme_name, } /* We try all supported major versions from current to oldest */ - for (version = THEME_VERSION; (version > 0); version--) + for (major_version = THEME_MAJOR_VERSION; (major_version > 0); major_version--) { /* We try first in home dir, XDG_USER_DATA_DIR, XDG_DATA_DIRS, * then system dir for themes */ @@ -4141,7 +4357,7 @@ meta_theme_load (const char *theme_name, THEME_SUBDIR, NULL); - retval = load_theme (theme_dir, theme_name, version, &error); + retval = load_theme (theme_dir, theme_name, major_version, &error); g_free (theme_dir); if (!keep_trying (&error)) goto out; @@ -4153,7 +4369,7 @@ meta_theme_load (const char *theme_name, THEME_SUBDIR, NULL); - retval = load_theme (theme_dir, theme_name, version, &error); + retval = load_theme (theme_dir, theme_name, major_version, &error); g_free (theme_dir); if (!keep_trying (&error)) @@ -4169,7 +4385,7 @@ meta_theme_load (const char *theme_name, THEME_SUBDIR, NULL); - retval = load_theme (theme_dir, theme_name, version, &error); + retval = load_theme (theme_dir, theme_name, major_version, &error); g_free (theme_dir); if (!keep_trying (&error)) goto out; @@ -4180,7 +4396,7 @@ meta_theme_load (const char *theme_name, theme_name, THEME_SUBDIR, NULL); - retval = load_theme (theme_dir, theme_name, version, &error); + retval = load_theme (theme_dir, theme_name, major_version, &error); g_free (theme_dir); if (!keep_trying (&error)) goto out; |