gtk2/gtk/gtkcssparser.c

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/* GTK - The GIMP Toolkit
* Copyright (C) 2011 Benjamin Otte <otte@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkcssparserprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkwin32themeprivate.h"
#include <errno.h>
#include <string.h>
/* just for the errors, yay! */
#include "gtkcssprovider.h"
#define NEWLINE_CHARS "\r\n"
#define WHITESPACE_CHARS "\f \t"
#define NMSTART "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
#define NMCHAR NMSTART "01234567890-_"
#define URLCHAR NMCHAR "!#$%&*~"
#define GTK_IS_CSS_PARSER(parser) ((parser) != NULL)
struct _GtkCssParser
{
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const char *data;
GFile *file;
GtkCssParserErrorFunc error_func;
gpointer user_data;
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const char *line_start;
guint line;
};
GtkCssParser *
_gtk_css_parser_new (const char *data,
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GFile *file,
GtkCssParserErrorFunc error_func,
gpointer user_data)
{
GtkCssParser *parser;
g_return_val_if_fail (data != NULL, NULL);
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g_return_val_if_fail (file == NULL || G_IS_FILE (file), NULL);
parser = g_slice_new0 (GtkCssParser);
parser->data = data;
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if (file)
parser->file = g_object_ref (file);
parser->error_func = error_func;
parser->user_data = user_data;
parser->line_start = data;
parser->line = 0;
return parser;
}
void
_gtk_css_parser_free (GtkCssParser *parser)
{
g_return_if_fail (GTK_IS_CSS_PARSER (parser));
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if (parser->file)
g_object_unref (parser->file);
g_slice_free (GtkCssParser, parser);
}
gboolean
_gtk_css_parser_is_eof (GtkCssParser *parser)
{
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), TRUE);
return *parser->data == 0;
}
gboolean
_gtk_css_parser_begins_with (GtkCssParser *parser,
char c)
{
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), TRUE);
return *parser->data == c;
}
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gboolean
_gtk_css_parser_has_prefix (GtkCssParser *parser,
const char *prefix)
{
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
return g_ascii_strncasecmp (parser->data, prefix, strlen (prefix)) == 0;
}
guint
_gtk_css_parser_get_line (GtkCssParser *parser)
{
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), 1);
return parser->line;
}
guint
_gtk_css_parser_get_position (GtkCssParser *parser)
{
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), 1);
return parser->data - parser->line_start;
}
static GFile *
gtk_css_parser_get_base_file (GtkCssParser *parser)
{
GFile *base;
if (parser->file)
{
base = g_file_get_parent (parser->file);
}
else
{
char *dir = g_get_current_dir ();
base = g_file_new_for_path (dir);
g_free (dir);
}
return base;
}
GFile *
_gtk_css_parser_get_file_for_path (GtkCssParser *parser,
const char *path)
{
GFile *base, *file;
g_return_val_if_fail (parser != NULL, NULL);
g_return_val_if_fail (path != NULL, NULL);
base = gtk_css_parser_get_base_file (parser);
file = g_file_resolve_relative_path (base, path);
g_object_unref (base);
return file;
}
GFile *
_gtk_css_parser_get_file (GtkCssParser *parser)
{
g_return_val_if_fail (parser != NULL, NULL);
return parser->file;
}
void
_gtk_css_parser_take_error (GtkCssParser *parser,
GError *error)
{
parser->error_func (parser, error, parser->user_data);
g_error_free (error);
}
void
_gtk_css_parser_error (GtkCssParser *parser,
const char *format,
...)
{
GError *error;
va_list args;
va_start (args, format);
error = g_error_new_valist (GTK_CSS_PROVIDER_ERROR,
GTK_CSS_PROVIDER_ERROR_SYNTAX,
format, args);
va_end (args);
_gtk_css_parser_take_error (parser, error);
}
void
_gtk_css_parser_error_full (GtkCssParser *parser,
GtkCssProviderError code,
const char *format,
...)
{
GError *error;
va_list args;
va_start (args, format);
error = g_error_new_valist (GTK_CSS_PROVIDER_ERROR,
code, format, args);
va_end (args);
_gtk_css_parser_take_error (parser, error);
}
static gboolean
gtk_css_parser_new_line (GtkCssParser *parser)
{
gboolean result = FALSE;
if (*parser->data == '\r')
{
result = TRUE;
parser->data++;
}
if (*parser->data == '\n')
{
result = TRUE;
parser->data++;
}
if (result)
{
parser->line++;
parser->line_start = parser->data;
}
return result;
}
static gboolean
gtk_css_parser_skip_comment (GtkCssParser *parser)
{
if (parser->data[0] != '/' ||
parser->data[1] != '*')
return FALSE;
parser->data += 2;
while (*parser->data)
{
gsize len = strcspn (parser->data, NEWLINE_CHARS "/");
parser->data += len;
if (gtk_css_parser_new_line (parser))
continue;
parser->data++;
if (parser->data[-2] == '*')
return TRUE;
if (parser->data[0] == '*')
_gtk_css_parser_error (parser, "'/*' in comment block");
}
/* FIXME: position */
_gtk_css_parser_error (parser, "Unterminated comment");
return TRUE;
}
void
_gtk_css_parser_skip_whitespace (GtkCssParser *parser)
{
size_t len;
while (*parser->data)
{
if (gtk_css_parser_new_line (parser))
continue;
len = strspn (parser->data, WHITESPACE_CHARS);
if (len)
{
parser->data += len;
continue;
}
if (!gtk_css_parser_skip_comment (parser))
break;
}
}
gboolean
_gtk_css_parser_try (GtkCssParser *parser,
const char *string,
gboolean skip_whitespace)
{
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
g_return_val_if_fail (string != NULL, FALSE);
if (g_ascii_strncasecmp (parser->data, string, strlen (string)) != 0)
return FALSE;
parser->data += strlen (string);
if (skip_whitespace)
_gtk_css_parser_skip_whitespace (parser);
return TRUE;
}
static guint
get_xdigit (char c)
{
if (c >= 'a')
return c - 'a' + 10;
else if (c >= 'A')
return c - 'A' + 10;
else
return c - '0';
}
static void
_gtk_css_parser_unescape (GtkCssParser *parser,
GString *str)
{
guint i;
gunichar result = 0;
g_assert (*parser->data == '\\');
parser->data++;
for (i = 0; i < 6; i++)
{
if (!g_ascii_isxdigit (parser->data[i]))
break;
result = (result << 4) + get_xdigit (parser->data[i]);
}
if (i != 0)
{
g_string_append_unichar (str, result);
parser->data += i;
/* NB: gtk_css_parser_new_line() forward data pointer itself */
if (!gtk_css_parser_new_line (parser) &&
*parser->data &&
strchr (WHITESPACE_CHARS, *parser->data))
parser->data++;
return;
}
if (gtk_css_parser_new_line (parser))
return;
g_string_append_c (str, *parser->data);
parser->data++;
return;
}
static gboolean
_gtk_css_parser_read_char (GtkCssParser *parser,
GString * str,
const char * allowed)
{
if (*parser->data == 0)
return FALSE;
if (strchr (allowed, *parser->data))
{
g_string_append_c (str, *parser->data);
parser->data++;
return TRUE;
}
if (*parser->data >= 127)
{
gsize len = g_utf8_skip[(guint) *(guchar *) parser->data];
g_string_append_len (str, parser->data, len);
parser->data += len;
return TRUE;
}
if (*parser->data == '\\')
{
_gtk_css_parser_unescape (parser, str);
return TRUE;
}
return FALSE;
}
char *
_gtk_css_parser_try_name (GtkCssParser *parser,
gboolean skip_whitespace)
{
GString *name;
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), NULL);
name = g_string_new (NULL);
while (_gtk_css_parser_read_char (parser, name, NMCHAR))
;
if (skip_whitespace)
_gtk_css_parser_skip_whitespace (parser);
return g_string_free (name, FALSE);
}
char *
_gtk_css_parser_try_ident (GtkCssParser *parser,
gboolean skip_whitespace)
{
const char *start;
GString *ident;
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), NULL);
start = parser->data;
ident = g_string_new (NULL);
if (*parser->data == '-')
{
g_string_append_c (ident, '-');
parser->data++;
}
if (!_gtk_css_parser_read_char (parser, ident, NMSTART))
{
parser->data = start;
g_string_free (ident, TRUE);
return NULL;
}
while (_gtk_css_parser_read_char (parser, ident, NMCHAR))
;
if (skip_whitespace)
_gtk_css_parser_skip_whitespace (parser);
return g_string_free (ident, FALSE);
}
gboolean
_gtk_css_parser_is_string (GtkCssParser *parser)
{
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
return *parser->data == '"' || *parser->data == '\'';
}
char *
_gtk_css_parser_read_string (GtkCssParser *parser)
{
GString *str;
char quote;
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), NULL);
quote = *parser->data;
if (quote != '"' && quote != '\'')
{
_gtk_css_parser_error (parser, "Expected a string.");
return NULL;
}
parser->data++;
str = g_string_new (NULL);
while (TRUE)
{
gsize len = strcspn (parser->data, "\\'\"\n\r\f");
g_string_append_len (str, parser->data, len);
parser->data += len;
switch (*parser->data)
{
case '\\':
_gtk_css_parser_unescape (parser, str);
break;
case '"':
case '\'':
if (*parser->data == quote)
{
parser->data++;
_gtk_css_parser_skip_whitespace (parser);
return g_string_free (str, FALSE);
}
g_string_append_c (str, *parser->data);
parser->data++;
break;
case '\0':
/* FIXME: position */
_gtk_css_parser_error (parser, "Missing end quote in string.");
g_string_free (str, TRUE);
return NULL;
default:
_gtk_css_parser_error (parser,
"Invalid character in string. Must be escaped.");
g_string_free (str, TRUE);
return NULL;
}
}
g_assert_not_reached ();
return NULL;
}
gboolean
_gtk_css_parser_try_int (GtkCssParser *parser,
int *value)
{
gint64 result;
char *end;
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
g_return_val_if_fail (value != NULL, FALSE);
/* strtoll parses a plus, but we are not allowed to */
if (*parser->data == '+')
return FALSE;
errno = 0;
result = g_ascii_strtoll (parser->data, &end, 10);
if (errno)
return FALSE;
if (result > G_MAXINT || result < G_MININT)
return FALSE;
if (parser->data == end)
return FALSE;
parser->data = end;
*value = result;
_gtk_css_parser_skip_whitespace (parser);
return TRUE;
}
gboolean
_gtk_css_parser_try_uint (GtkCssParser *parser,
guint *value)
{
guint64 result;
char *end;
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
g_return_val_if_fail (value != NULL, FALSE);
errno = 0;
result = g_ascii_strtoull (parser->data, &end, 10);
if (errno)
return FALSE;
if (result > G_MAXUINT)
return FALSE;
if (parser->data == end)
return FALSE;
parser->data = end;
*value = result;
_gtk_css_parser_skip_whitespace (parser);
return TRUE;
}
gboolean
_gtk_css_parser_try_double (GtkCssParser *parser,
gdouble *value)
{
gdouble result;
char *end;
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
g_return_val_if_fail (value != NULL, FALSE);
errno = 0;
result = g_ascii_strtod (parser->data, &end);
if (errno)
return FALSE;
if (parser->data == end)
return FALSE;
parser->data = end;
*value = result;
_gtk_css_parser_skip_whitespace (parser);
return TRUE;
}
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gboolean
_gtk_css_parser_has_number (GtkCssParser *parser)
{
/* ahem */
return strchr ("+-0123456789.", parser->data[0]) != NULL;
}
GtkCssValue *
_gtk_css_number_value_parse (GtkCssParser *parser,
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GtkCssNumberParseFlags flags)
{
static const struct {
const char *name;
GtkCssUnit unit;
GtkCssNumberParseFlags required_flags;
} units[] = {
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{ "px", GTK_CSS_PX, GTK_CSS_PARSE_LENGTH },
{ "pt", GTK_CSS_PT, GTK_CSS_PARSE_LENGTH },
{ "em", GTK_CSS_EM, GTK_CSS_PARSE_LENGTH },
{ "ex", GTK_CSS_EX, GTK_CSS_PARSE_LENGTH },
{ "pc", GTK_CSS_PC, GTK_CSS_PARSE_LENGTH },
{ "in", GTK_CSS_IN, GTK_CSS_PARSE_LENGTH },
{ "cm", GTK_CSS_CM, GTK_CSS_PARSE_LENGTH },
{ "mm", GTK_CSS_MM, GTK_CSS_PARSE_LENGTH },
{ "rad", GTK_CSS_RAD, GTK_CSS_PARSE_ANGLE },
{ "deg", GTK_CSS_DEG, GTK_CSS_PARSE_ANGLE },
{ "grad", GTK_CSS_GRAD, GTK_CSS_PARSE_ANGLE },
{ "turn", GTK_CSS_TURN, GTK_CSS_PARSE_ANGLE },
{ "s", GTK_CSS_S, GTK_CSS_PARSE_TIME },
{ "ms", GTK_CSS_MS, GTK_CSS_PARSE_TIME }
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};
char *end, *unit_name;
double value;
GtkCssUnit unit;
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g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), NULL);
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errno = 0;
value = g_ascii_strtod (parser->data, &end);
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if (errno)
{
_gtk_css_parser_error (parser, "not a number: %s", g_strerror (errno));
return NULL;
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}
if (parser->data == end)
{
_gtk_css_parser_error (parser, "not a number");
return NULL;
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}
parser->data = end;
if (flags & GTK_CSS_POSITIVE_ONLY &&
value < 0)
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{
_gtk_css_parser_error (parser, "negative values are not allowed.");
return NULL;
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}
unit_name = _gtk_css_parser_try_ident (parser, FALSE);
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if (unit_name)
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{
guint i;
for (i = 0; i < G_N_ELEMENTS (units); i++)
{
if (flags & units[i].required_flags &&
g_ascii_strcasecmp (unit_name, units[i].name) == 0)
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break;
}
if (i >= G_N_ELEMENTS (units))
{
_gtk_css_parser_error (parser, "`%s' is not a valid unit.", unit_name);
g_free (unit_name);
return NULL;
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}
unit = units[i].unit;
g_free (unit_name);
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}
else
{
if ((flags & GTK_CSS_PARSE_PERCENT) &&
_gtk_css_parser_try (parser, "%", FALSE))
{
unit = GTK_CSS_PERCENT;
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}
else if (value == 0.0)
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{
if (flags & GTK_CSS_PARSE_NUMBER)
unit = GTK_CSS_NUMBER;
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else if (flags & GTK_CSS_PARSE_LENGTH)
unit = GTK_CSS_PX;
else if (flags & GTK_CSS_PARSE_ANGLE)
unit = GTK_CSS_DEG;
else if (flags & GTK_CSS_PARSE_TIME)
unit = GTK_CSS_S;
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else
unit = GTK_CSS_PERCENT;
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}
else if (flags & GTK_CSS_NUMBER_AS_PIXELS)
{
_gtk_css_parser_error_full (parser,
GTK_CSS_PROVIDER_ERROR_DEPRECATED,
"Not using units is deprecated. Assuming 'px'.");
unit = GTK_CSS_PX;
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}
else if (flags & GTK_CSS_PARSE_NUMBER)
{
unit = GTK_CSS_NUMBER;
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}
else
{
_gtk_css_parser_error (parser, "Unit is missing.");
return NULL;
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}
}
_gtk_css_parser_skip_whitespace (parser);
return _gtk_css_number_value_new (value, unit);
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}
/* XXX: we should introduce GtkCssLenght that deals with
* different kind of units */
gboolean
_gtk_css_parser_try_length (GtkCssParser *parser,
int *value)
{
if (!_gtk_css_parser_try_int (parser, value))
return FALSE;
/* FIXME: _try_uint skips spaces while the
* spec forbids them
*/
_gtk_css_parser_try (parser, "px", TRUE);
return TRUE;
}
gboolean
_gtk_css_parser_try_enum (GtkCssParser *parser,
GType enum_type,
int *value)
{
GEnumClass *enum_class;
gboolean result;
const char *start;
char *str;
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
g_return_val_if_fail (value != NULL, FALSE);
result = FALSE;
enum_class = g_type_class_ref (enum_type);
start = parser->data;
str = _gtk_css_parser_try_ident (parser, TRUE);
if (str == NULL)
return FALSE;
if (enum_class->n_values)
{
GEnumValue *enum_value;
for (enum_value = enum_class->values; enum_value->value_name; enum_value++)
{
if (enum_value->value_nick &&
g_ascii_strcasecmp (str, enum_value->value_nick) == 0)
{
*value = enum_value->value;
result = TRUE;
break;
}
}
}
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g_free (str);
g_type_class_unref (enum_class);
if (!result)
parser->data = start;
return result;
}
gboolean
_gtk_css_parser_try_hash_color (GtkCssParser *parser,
GdkRGBA *rgba)
{
if (parser->data[0] == '#' &&
g_ascii_isxdigit (parser->data[1]) &&
g_ascii_isxdigit (parser->data[2]) &&
g_ascii_isxdigit (parser->data[3]))
{
if (g_ascii_isxdigit (parser->data[4]) &&
g_ascii_isxdigit (parser->data[5]) &&
g_ascii_isxdigit (parser->data[6]))
{
rgba->red = ((get_xdigit (parser->data[1]) << 4) + get_xdigit (parser->data[2])) / 255.0;
rgba->green = ((get_xdigit (parser->data[3]) << 4) + get_xdigit (parser->data[4])) / 255.0;
rgba->blue = ((get_xdigit (parser->data[5]) << 4) + get_xdigit (parser->data[6])) / 255.0;
rgba->alpha = 1.0;
parser->data += 7;
}
else
{
rgba->red = get_xdigit (parser->data[1]) / 15.0;
rgba->green = get_xdigit (parser->data[2]) / 15.0;
rgba->blue = get_xdigit (parser->data[3]) / 15.0;
rgba->alpha = 1.0;
parser->data += 4;
}
_gtk_css_parser_skip_whitespace (parser);
return TRUE;
}
return FALSE;
}
GFile *
_gtk_css_parser_read_url (GtkCssParser *parser)
{
gchar *path;
char *scheme;
GFile *file;
if (_gtk_css_parser_try (parser, "url", FALSE))
{
if (!_gtk_css_parser_try (parser, "(", TRUE))
{
_gtk_css_parser_skip_whitespace (parser);
if (_gtk_css_parser_try (parser, "(", TRUE))
{
_gtk_css_parser_error_full (parser,
GTK_CSS_PROVIDER_ERROR_DEPRECATED,
"Whitespace between 'url' and '(' is deprecated");
}
else
{
_gtk_css_parser_error (parser, "Expected '(' after 'url'");
return NULL;
}
}
path = _gtk_css_parser_read_string (parser);
if (path == NULL)
return NULL;
if (!_gtk_css_parser_try (parser, ")", TRUE))
{
_gtk_css_parser_error (parser, "No closing ')' found for 'url'");
g_free (path);
return NULL;
}
scheme = g_uri_parse_scheme (path);
if (scheme != NULL)
{
file = g_file_new_for_uri (path);
g_free (path);
g_free (scheme);
return file;
}
}
else
{
path = _gtk_css_parser_try_name (parser, TRUE);
if (path == NULL)
{
_gtk_css_parser_error (parser, "Not a valid url");
return NULL;
}
}
file = _gtk_css_parser_get_file_for_path (parser, path);
g_free (path);
return file;
}
static void
gtk_css_parser_resync_internal (GtkCssParser *parser,
gboolean sync_at_semicolon,
gboolean read_sync_token,
char terminator)
{
gsize len;
do {
len = strcspn (parser->data, "\\\"'/()[]{};" NEWLINE_CHARS);
parser->data += len;
if (gtk_css_parser_new_line (parser))
continue;
if (_gtk_css_parser_is_string (parser))
{
/* Hrm, this emits errors, and i suspect it shouldn't... */
char *free_me = _gtk_css_parser_read_string (parser);
g_free (free_me);
continue;
}
if (gtk_css_parser_skip_comment (parser))
continue;
switch (*parser->data)
{
case '\\':
{
GString *ignore = g_string_new (NULL);
_gtk_css_parser_unescape (parser, ignore);
g_string_free (ignore, TRUE);
}
break;
case ';':
if (sync_at_semicolon && !read_sync_token)
return;
parser->data++;
if (sync_at_semicolon)
{
_gtk_css_parser_skip_whitespace (parser);
return;
}
break;
case '(':
parser->data++;
_gtk_css_parser_resync (parser, FALSE, ')');
if (*parser->data)
parser->data++;
break;
case '[':
parser->data++;
_gtk_css_parser_resync (parser, FALSE, ']');
if (*parser->data)
parser->data++;
break;
case '{':
parser->data++;
_gtk_css_parser_resync (parser, FALSE, '}');
if (*parser->data)
parser->data++;
if (sync_at_semicolon || !terminator)
{
_gtk_css_parser_skip_whitespace (parser);
return;
}
break;
case '}':
case ')':
case ']':
if (terminator == *parser->data)
{
_gtk_css_parser_skip_whitespace (parser);
return;
}
parser->data++;
continue;
case '\0':
break;
case '/':
default:
parser->data++;
break;
}
} while (*parser->data);
}
char *
_gtk_css_parser_read_value (GtkCssParser *parser)
{
const char *start;
char *result;
g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), NULL);
start = parser->data;
/* This needs to be done better */
gtk_css_parser_resync_internal (parser, TRUE, FALSE, '}');
result = g_strndup (start, parser->data - start);
if (result)
{
g_strchomp (result);
if (result[0] == 0)
{
g_free (result);
result = NULL;
}
}
if (result == NULL)
_gtk_css_parser_error (parser, "Expected a property value");
return result;
}
void
_gtk_css_parser_resync (GtkCssParser *parser,
gboolean sync_at_semicolon,
char terminator)
{
g_return_if_fail (GTK_IS_CSS_PARSER (parser));
gtk_css_parser_resync_internal (parser, sync_at_semicolon, TRUE, terminator);
}