[gtk+/gtk-style-context] GtkCssProvider: Improve error handling and reporting.
- From: Carlos Garnacho <carlosg src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/gtk-style-context] GtkCssProvider: Improve error handling and reporting.
- Date: Fri, 3 Dec 2010 21:05:48 +0000 (UTC)
commit 7f8976cbb06569640d2b33a19faf3d19d088135e
Author: Carlos Garnacho <carlosg gnome org>
Date: Fri Dec 3 21:56:39 2010 +0100
GtkCssProvider: Improve error handling and reporting.
Nicer error reports are provided, and a GError can be spread from
anywhere in parsing, so over time more precise and meaningful
messages can be produced.
gtk/gtkcssprovider.c | 376 ++++++++++++++++++++++++++++----------------------
1 files changed, 212 insertions(+), 164 deletions(-)
---
diff --git a/gtk/gtkcssprovider.c b/gtk/gtkcssprovider.c
index f178905..5ab102a 100644
--- a/gtk/gtkcssprovider.c
+++ b/gtk/gtkcssprovider.c
@@ -739,6 +739,9 @@ struct GtkCssProviderPrivate
GScanner *scanner;
gchar *filename;
+ const gchar *buffer;
+ const gchar *value_pos;
+
GHashTable *symbolic_colors;
GPtrArray *selectors_info;
@@ -779,14 +782,19 @@ static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
static void scanner_apply_scope (GScanner *scanner,
ParserScope scope);
-static gboolean css_provider_parse_value (GtkCssProvider *css_provider,
- const gchar *value_str,
- GValue *value);
+static gboolean css_provider_parse_value (GtkCssProvider *css_provider,
+ const gchar *value_str,
+ GValue *value,
+ GError **error);
static gboolean gtk_css_provider_load_from_path_internal (GtkCssProvider *css_provider,
const gchar *path,
gboolean reset,
GError **error);
+enum {
+ CSS_PROVIDER_PARSE_ERROR
+};
+
GQuark
gtk_css_provider_error_quark (void)
@@ -1374,7 +1382,7 @@ gtk_css_provider_get_style_property (GtkStyleProvider *provider,
val_str = g_value_get_string (val);
found = TRUE;
- css_provider_parse_value (GTK_CSS_PROVIDER (provider), val_str, value);
+ css_provider_parse_value (GTK_CSS_PROVIDER (provider), val_str, value, NULL);
break;
}
}
@@ -1521,6 +1529,8 @@ css_provider_reset_parser (GtkCssProvider *css_provider)
priv->state = NULL;
scanner_apply_scope (priv->scanner, SCOPE_SELECTOR);
+ priv->scanner->user_data = NULL;
+ priv->value_pos = NULL;
g_slist_foreach (priv->cur_selectors, (GFunc) selector_path_unref, NULL);
g_slist_free (priv->cur_selectors);
@@ -2121,7 +2131,8 @@ symbolic_color_parse_str (const gchar *string,
}
static GtkSymbolicColor *
-symbolic_color_parse (const gchar *str)
+symbolic_color_parse (const gchar *str,
+ GError **error)
{
GtkSymbolicColor *color;
gchar *end;
@@ -2130,8 +2141,10 @@ symbolic_color_parse (const gchar *str)
if (*end != '\0')
{
- g_message ("Error parsing symbolic color \"%s\", stopped at char %ld : '%c'",
- str, end - str, *end);
+ g_set_error_literal (error,
+ gtk_css_provider_error_quark (),
+ CSS_PROVIDER_PARSE_ERROR,
+ "Could not parse symbolic color");
if (color)
{
@@ -2217,6 +2230,13 @@ gradient_parse_str (const gchar *str,
else
{
coords[i * 3] = g_ascii_strtod (str, &end);
+
+ if (str == end)
+ {
+ *end_ptr = (gchar *) str;
+ return NULL;
+ }
+
str = end;
}
@@ -2240,6 +2260,13 @@ gradient_parse_str (const gchar *str,
else
{
coords[(i * 3) + 1] = g_ascii_strtod (str, &end);
+
+ if (str == end)
+ {
+ *end_ptr = (gchar *) str;
+ return NULL;
+ }
+
str = end;
}
@@ -2377,33 +2404,11 @@ gradient_parse_str (const gchar *str,
return gradient;
}
-static GtkGradient *
-gradient_parse (const gchar *str)
-{
- GtkGradient *gradient;
- gchar *end;
-
- gradient = gradient_parse_str (str, &end);
-
- if (*end != '\0')
- {
- g_message ("Error parsing pattern \"%s\", stopped at char %ld : '%c'",
- str, end - str, *end);
-
- if (gradient)
- {
- gtk_gradient_unref (gradient);
- gradient = NULL;
- }
- }
-
- return gradient;
-}
-
static gchar *
path_parse_str (GtkCssProvider *css_provider,
const gchar *str,
- gchar **end_ptr)
+ gchar **end_ptr,
+ GError **error)
{
gchar *path, *chr;
const gchar *start, *end;
@@ -2488,7 +2493,8 @@ path_parse_str (GtkCssProvider *css_provider,
if (!g_file_test (path, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
{
- g_warning ("File doesn't exist: %s\n", path);
+ g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_EXIST,
+ "File doesn't exist: %s", path);
g_free (path);
path = NULL;
*end_ptr = (gchar *)start;
@@ -2498,24 +2504,26 @@ path_parse_str (GtkCssProvider *css_provider,
}
static gchar *
-path_parse (GtkCssProvider *css_provider,
- const gchar *str)
+path_parse (GtkCssProvider *css_provider,
+ const gchar *str,
+ GError **error)
{
gchar *path;
gchar *end;
- path = path_parse_str (css_provider, str, &end);
+ path = path_parse_str (css_provider, str, &end, error);
+
+ if (!path)
+ return NULL;
if (*end != '\0')
{
- g_message ("Error parsing file path \"%s\", stopped at char %ld : '%c'",
- str, end - str, *end);
-
- if (path)
- {
- g_free (path);
- path = NULL;
- }
+ g_set_error_literal (error,
+ gtk_css_provider_error_quark (),
+ CSS_PROVIDER_PARSE_ERROR,
+ "Error parsing path");
+ g_free (path);
+ path = NULL;
}
return path;
@@ -2524,12 +2532,12 @@ path_parse (GtkCssProvider *css_provider,
static Gtk9Slice *
slice_parse_str (GtkCssProvider *css_provider,
const gchar *str,
- gchar **end_ptr)
+ gchar **end_ptr,
+ GError **error)
{
gdouble distance_top, distance_bottom;
gdouble distance_left, distance_right;
GtkSliceSideModifier mods[2];
- GError *error = NULL;
GdkPixbuf *pixbuf;
Gtk9Slice *slice;
gchar *path;
@@ -2538,7 +2546,7 @@ slice_parse_str (GtkCssProvider *css_provider,
SKIP_SPACES (str);
/* Parse image url */
- path = path_parse_str (css_provider, str, end_ptr);
+ path = path_parse_str (css_provider, str, end_ptr, error);
if (!path)
return NULL;
@@ -2604,13 +2612,11 @@ slice_parse_str (GtkCssProvider *css_provider,
mods[1] = mods[0];
}
- pixbuf = gdk_pixbuf_new_from_file (path, &error);
+ pixbuf = gdk_pixbuf_new_from_file (path, error);
g_free (path);
- if (error)
+ if (!pixbuf)
{
- g_warning ("Pixbuf could not be loaded: %s\n", error->message);
- g_error_free (error);
*end_ptr = (gchar *) str;
return NULL;
}
@@ -2624,30 +2630,6 @@ slice_parse_str (GtkCssProvider *css_provider,
return slice;
}
-static Gtk9Slice *
-slice_parse (GtkCssProvider *css_provider,
- const gchar *str)
-{
- Gtk9Slice *slice;
- gchar *end;
-
- slice = slice_parse_str (css_provider, str, &end);
-
- if (*end != '\0')
- {
- g_message ("Error parsing sliced image \"%s\", stopped at char %ld : '%c'",
- str, end - str, *end);
-
- if (slice)
- {
- gtk_9slice_unref (slice);
- slice = NULL;
- }
- }
-
- return slice;
-}
-
static gdouble
unit_parse_str (const gchar *str,
gchar **end_str)
@@ -2740,36 +2722,18 @@ border_parse_str (const gchar *str,
return border;
}
-static GtkBorder *
-border_parse (const gchar *str)
-{
- GtkBorder *border;
- gchar *end;
-
- border = border_parse_str (str, &end);
-
- if (*end != '\0')
- {
- g_message ("Error parsing border \"%s\", stopped at char %ld : '%c'",
- str, end - str, *end);
-
- if (border)
- gtk_border_free (border);
-
- return NULL;
- }
-
- return border;
-}
-
static gboolean
-css_provider_parse_value (GtkCssProvider *css_provider,
- const gchar *value_str,
- GValue *value)
+css_provider_parse_value (GtkCssProvider *css_provider,
+ const gchar *value_str,
+ GValue *value,
+ GError **error)
{
+ GtkCssProviderPrivate *priv;
GType type;
gboolean parsed = TRUE;
+ gchar *end = NULL;
+ priv = css_provider->priv;
type = G_VALUE_TYPE (value);
if (type == GDK_TYPE_RGBA ||
@@ -2788,7 +2752,7 @@ css_provider_parse_value (GtkCssProvider *css_provider,
{
GtkSymbolicColor *symbolic_color;
- symbolic_color = symbolic_color_parse (value_str);
+ symbolic_color = symbolic_color_parse_str (value_str, &end);
if (!symbolic_color)
return FALSE;
@@ -2843,14 +2807,14 @@ css_provider_parse_value (GtkCssProvider *css_provider,
{
GtkBorder *border;
- border = border_parse (value_str);
+ border = border_parse_str (value_str, &end);
g_value_take_boxed (value, border);
}
else if (type == CAIRO_GOBJECT_TYPE_PATTERN)
{
GtkGradient *gradient;
- gradient = gradient_parse (value_str);
+ gradient = gradient_parse_str (value_str, &end);
if (gradient)
{
@@ -2863,7 +2827,8 @@ css_provider_parse_value (GtkCssProvider *css_provider,
gchar *path;
GdkPixbuf *pixbuf;
- path = path_parse (css_provider, value_str);
+ g_clear_error (error);
+ path = path_parse_str (css_provider, value_str, &end, error);
if (path)
{
@@ -2979,7 +2944,7 @@ css_provider_parse_value (GtkCssProvider *css_provider,
{
Gtk9Slice *slice;
- slice = slice_parse (css_provider, value_str);
+ slice = slice_parse_str (css_provider, value_str, &end, error);
if (slice)
g_value_take_boxed (value, slice);
@@ -2992,12 +2957,103 @@ css_provider_parse_value (GtkCssProvider *css_provider,
parsed = FALSE;
}
+ if (end && *end)
+ {
+ /* Set error position in the scanner
+ * according to what we've parsed so far
+ */
+ priv->value_pos += (end - value_str);
+
+ if (error && !*error)
+ g_set_error_literal (error,
+ gtk_css_provider_error_quark (),
+ CSS_PROVIDER_PARSE_ERROR,
+ "Failed to parse value");
+ }
+
return parsed;
}
+static void
+scanner_report_warning (GtkCssProvider *css_provider,
+ GTokenType expected_token,
+ GError *error)
+{
+ GtkCssProviderPrivate *priv;
+ const gchar *line_end, *line_start;
+ const gchar *expected_str;
+ gchar buf[2], *line, *str;
+ guint pos;
+
+ priv = css_provider->priv;
+
+ if (error)
+ str = g_strdup (error->message);
+ else
+ {
+ if (priv->scanner->user_data)
+ expected_str = priv->scanner->user_data;
+ else
+ {
+ switch (expected_token)
+ {
+ case G_TOKEN_SYMBOL:
+ expected_str = "Symbol";
+ case G_TOKEN_IDENTIFIER:
+ expected_str = "Identifier";
+ default:
+ buf[0] = expected_token;
+ buf[1] = '\0';
+ expected_str = buf;
+ }
+ }
+
+ str = g_strdup_printf ("Parse error, expecting a %s '%s'",
+ (expected_str != buf) ? "valid" : "",
+ expected_str);
+ }
+
+ if (priv->value_pos)
+ line_start = priv->value_pos - 1;
+ else
+ line_start = priv->scanner->text - 1;
+
+ while (*line_start != '\n' &&
+ line_start != priv->buffer)
+ line_start--;
+
+ if (*line_start == '\n')
+ line_start++;
+
+ if (priv->value_pos)
+ pos = priv->value_pos - line_start + 1;
+ else
+ pos = priv->scanner->text - line_start - 1;
+
+ line_end = strchr (line_start, '\n');
+
+ if (line_end)
+ line = g_strndup (line_start, (line_end - line_start));
+ else
+ line = g_strdup (line_start);
+
+ g_message ("CSS: %s\n"
+ "%s, line %d, char %d:\n"
+ "%*c %s\n"
+ "%*c ^",
+ str, priv->scanner->input_name,
+ priv->scanner->line, priv->scanner->position,
+ 3, ' ', line,
+ 3 + pos, ' ');
+
+ g_free (line);
+ g_free (str);
+}
+
static GTokenType
-parse_rule (GtkCssProvider *css_provider,
- GScanner *scanner)
+parse_rule (GtkCssProvider *css_provider,
+ GScanner *scanner,
+ GError **error)
{
GtkCssProviderPrivate *priv;
GTokenType expected_token;
@@ -3024,20 +3080,29 @@ parse_rule (GtkCssProvider *css_provider,
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_IDENTIFIER)
- return G_TOKEN_IDENTIFIER;
+ {
+ scanner->user_data = "Color name";
+ return G_TOKEN_IDENTIFIER;
+ }
color_name = g_strdup (scanner->value.v_identifier);
css_provider_push_scope (css_provider, SCOPE_VALUE);
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_IDENTIFIER)
- return G_TOKEN_IDENTIFIER;
+ {
+ scanner->user_data = "Color definition";
+ return G_TOKEN_IDENTIFIER;
+ }
color_str = g_strstrip (scanner->value.v_identifier);
- color = symbolic_color_parse (color_str);
+ color = symbolic_color_parse (color_str, error);
if (!color)
- return G_TOKEN_IDENTIFIER;
+ {
+ scanner->user_data = "Color definition";
+ return G_TOKEN_IDENTIFIER;
+ }
g_hash_table_insert (priv->symbolic_colors, color_name, color);
@@ -3053,9 +3118,8 @@ parse_rule (GtkCssProvider *css_provider,
{
GScanner *scanner_backup;
GSList *state_backup;
- GError *error = NULL;
gboolean loaded;
- gchar *path;
+ gchar *path = NULL;
css_provider_push_scope (css_provider, SCOPE_VALUE);
g_scanner_get_next_token (scanner);
@@ -3063,15 +3127,18 @@ parse_rule (GtkCssProvider *css_provider,
if (scanner->token == G_TOKEN_IDENTIFIER &&
g_str_has_prefix (scanner->value.v_identifier, "url"))
path = path_parse (css_provider,
- g_strstrip (scanner->value.v_identifier));
+ g_strstrip (scanner->value.v_identifier),
+ error);
else if (scanner->token == G_TOKEN_STRING)
path = path_parse (css_provider,
- g_strstrip (scanner->value.v_string));
- else
- return G_TOKEN_IDENTIFIER;
+ g_strstrip (scanner->value.v_string),
+ error);
if (path == NULL)
- return G_TOKEN_IDENTIFIER;
+ {
+ scanner->user_data = "File URL";
+ return G_TOKEN_IDENTIFIER;
+ }
css_provider_pop_scope (css_provider);
g_scanner_get_next_token (scanner);
@@ -3091,7 +3158,7 @@ parse_rule (GtkCssProvider *css_provider,
/* FIXME: Avoid recursive importing */
loaded = gtk_css_provider_load_from_path_internal (css_provider, path,
- FALSE, &error);
+ FALSE, error);
/* Restore previous state */
css_provider_reset_parser (css_provider);
@@ -3103,16 +3170,17 @@ parse_rule (GtkCssProvider *css_provider,
if (!loaded)
{
- g_warning ("Error loading imported file \"%s\": %s",
- path, (error) ? error->message : "");
- g_error_free (error);
+ scanner->user_data = "File URL";
return G_TOKEN_IDENTIFIER;
}
else
return G_TOKEN_NONE;
}
else
- return G_TOKEN_IDENTIFIER;
+ {
+ scanner->user_data = "Directive";
+ return G_TOKEN_IDENTIFIER;
+ }
}
expected_token = parse_selector (css_provider, scanner, &selector);
@@ -3120,6 +3188,7 @@ parse_rule (GtkCssProvider *css_provider,
if (expected_token != G_TOKEN_NONE)
{
selector_path_unref (selector);
+ scanner->user_data = "Selector";
return expected_token;
}
@@ -3134,6 +3203,7 @@ parse_rule (GtkCssProvider *css_provider,
if (expected_token != G_TOKEN_NONE)
{
selector_path_unref (selector);
+ scanner->user_data = "Selector";
return expected_token;
}
@@ -3151,10 +3221,9 @@ parse_rule (GtkCssProvider *css_provider,
while (scanner->token == G_TOKEN_IDENTIFIER)
{
- const gchar *value_str = NULL;
+ gchar *value_str = NULL;
GtkStylePropertyParser parse_func = NULL;
GParamSpec *pspec;
- GError *error = NULL;
gchar *prop;
prop = g_strdup (scanner->value.v_identifier);
@@ -3166,16 +3235,21 @@ parse_rule (GtkCssProvider *css_provider,
return ':';
}
+ priv->value_pos = priv->scanner->text;
+
css_provider_push_scope (css_provider, SCOPE_VALUE);
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_IDENTIFIER)
{
g_free (prop);
+ scanner->user_data = "Property value";
return G_TOKEN_IDENTIFIER;
}
- value_str = g_strstrip (scanner->value.v_identifier);
+ value_str = scanner->value.v_identifier;
+ SKIP_SPACES (value_str);
+ g_strchomp (value_str);
if (gtk_style_properties_lookup_property (prop, &parse_func, &pspec))
{
@@ -3197,21 +3271,16 @@ parse_rule (GtkCssProvider *css_provider,
g_value_set_string (val, value_str);
g_hash_table_insert (priv->cur_properties, prop, val);
}
- else if ((parse_func && (parse_func) (value_str, val, &error)) ||
- (!parse_func && css_provider_parse_value (css_provider, value_str, val)))
+ else if ((parse_func && (parse_func) (value_str, val, error)) ||
+ (!parse_func && css_provider_parse_value (css_provider, value_str, val, error)))
g_hash_table_insert (priv->cur_properties, prop, val);
else
{
- if (error)
- {
- g_message ("Error parsing property value: %s\n", error->message);
- g_error_free (error);
- }
-
g_value_unset (val);
g_slice_free (GValue, val);
g_free (prop);
+ scanner->user_data = "Property value";
return G_TOKEN_IDENTIFIER;
}
}
@@ -3246,19 +3315,6 @@ parse_rule (GtkCssProvider *css_provider,
return G_TOKEN_NONE;
}
-static void
-scanner_msg (GScanner *scanner,
- gchar *message,
- gboolean is_error)
-{
- GError **error = scanner->user_data;
-
- g_set_error_literal (error,
- GTK_CSS_PROVIDER_ERROR,
- GTK_CSS_PROVIDER_ERROR_FAILED,
- message);
-}
-
static gboolean
parse_stylesheet (GtkCssProvider *css_provider,
GError **error)
@@ -3271,29 +3327,14 @@ parse_stylesheet (GtkCssProvider *css_provider,
while (!g_scanner_eof (priv->scanner))
{
GTokenType expected_token;
+ GError *err = NULL;
css_provider_reset_parser (css_provider);
- expected_token = parse_rule (css_provider, priv->scanner);
+ expected_token = parse_rule (css_provider, priv->scanner, &err);
if (expected_token != G_TOKEN_NONE)
{
- if (error != NULL)
- {
- priv->scanner->msg_handler = scanner_msg;
- priv->scanner->user_data = error;
- }
-
- g_scanner_unexp_token (priv->scanner, expected_token,
- NULL, NULL, NULL,
- "Error parsing style resource", FALSE);
-
- if (error != NULL)
- {
- priv->scanner->msg_handler = NULL;
- priv->scanner->user_data = NULL;
-
- return FALSE;
- }
+ scanner_report_warning (css_provider, expected_token, err);
while (!g_scanner_eof (priv->scanner) &&
priv->scanner->token != G_TOKEN_RIGHT_CURLY)
@@ -3302,6 +3343,7 @@ parse_stylesheet (GtkCssProvider *css_provider,
else
css_provider_commit (css_provider);
+ g_clear_error (&err);
g_scanner_get_next_token (priv->scanner);
}
@@ -3340,10 +3382,12 @@ gtk_css_provider_load_from_data (GtkCssProvider *css_provider,
g_ptr_array_remove_range (priv->selectors_info, 0, priv->selectors_info->len);
priv->scanner->input_name = "-";
+ priv->buffer = data;
g_scanner_input_text (priv->scanner, data, (guint) length);
g_free (priv->filename);
priv->filename = NULL;
+ priv->buffer = NULL;
return parse_stylesheet (css_provider, error);
}
@@ -3390,10 +3434,12 @@ gtk_css_provider_load_from_file (GtkCssProvider *css_provider,
priv->filename = g_file_get_path (file);
priv->scanner->input_name = priv->filename;
+ priv->buffer = data;
g_scanner_input_text (priv->scanner, data, (guint) length);
ret = parse_stylesheet (css_provider, error);
+ priv->buffer = NULL;
g_free (data);
return ret;
@@ -3438,10 +3484,12 @@ gtk_css_provider_load_from_path_internal (GtkCssProvider *css_provider,
}
priv->scanner->input_name = priv->filename;
+ priv->buffer = data;
g_scanner_input_text (priv->scanner, data, (guint) length);
ret = parse_stylesheet (css_provider, error);
+ priv->buffer = NULL;
g_mapped_file_unref (mapped_file);
return ret;
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