1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 2011 Benjamin Otte <otte@gnome.org>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
20 #include "gtkcssparserprivate.h"
21 #include "gtkwin32themeprivate.h"
26 /* just for the errors, yay! */
27 #include "gtkcssprovider.h"
29 #define NEWLINE_CHARS "\r\n"
30 #define WHITESPACE_CHARS "\f \t"
31 #define NMSTART "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
32 #define NMCHAR NMSTART "01234567890-_"
33 #define URLCHAR NMCHAR "!#$%&*~"
35 #define GTK_IS_CSS_PARSER(parser) ((parser) != NULL)
40 GtkCssParserErrorFunc error_func;
43 const char *line_start;
48 _gtk_css_parser_new (const char *data,
49 GtkCssParserErrorFunc error_func,
54 g_return_val_if_fail (data != NULL, NULL);
56 parser = g_slice_new0 (GtkCssParser);
59 parser->error_func = error_func;
60 parser->user_data = user_data;
62 parser->line_start = data;
69 _gtk_css_parser_free (GtkCssParser *parser)
71 g_return_if_fail (GTK_IS_CSS_PARSER (parser));
73 g_slice_free (GtkCssParser, parser);
77 _gtk_css_parser_is_eof (GtkCssParser *parser)
79 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), TRUE);
81 return *parser->data == 0;
85 _gtk_css_parser_begins_with (GtkCssParser *parser,
88 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), TRUE);
90 return *parser->data == c;
94 _gtk_css_parser_has_prefix (GtkCssParser *parser,
97 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
99 return g_ascii_strncasecmp (parser->data, prefix, strlen (prefix)) == 0;
103 _gtk_css_parser_get_line (GtkCssParser *parser)
105 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), 1);
111 _gtk_css_parser_get_position (GtkCssParser *parser)
113 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), 1);
115 return parser->data - parser->line_start;
119 _gtk_css_parser_take_error (GtkCssParser *parser,
122 parser->error_func (parser, error, parser->user_data);
124 g_error_free (error);
128 _gtk_css_parser_error (GtkCssParser *parser,
136 va_start (args, format);
137 error = g_error_new_valist (GTK_CSS_PROVIDER_ERROR,
138 GTK_CSS_PROVIDER_ERROR_SYNTAX,
142 _gtk_css_parser_take_error (parser, error);
146 gtk_css_parser_new_line (GtkCssParser *parser)
148 gboolean result = FALSE;
150 if (*parser->data == '\r')
155 if (*parser->data == '\n')
164 parser->line_start = parser->data;
171 gtk_css_parser_skip_comment (GtkCssParser *parser)
173 if (parser->data[0] != '/' ||
174 parser->data[1] != '*')
179 while (*parser->data)
181 gsize len = strcspn (parser->data, NEWLINE_CHARS "/");
185 if (gtk_css_parser_new_line (parser))
190 if (parser->data[-2] == '*')
192 if (parser->data[0] == '*')
193 _gtk_css_parser_error (parser, "'/*' in comment block");
196 /* FIXME: position */
197 _gtk_css_parser_error (parser, "Unterminated comment");
202 _gtk_css_parser_skip_whitespace (GtkCssParser *parser)
206 while (*parser->data)
208 if (gtk_css_parser_new_line (parser))
211 len = strspn (parser->data, WHITESPACE_CHARS);
218 if (!gtk_css_parser_skip_comment (parser))
224 _gtk_css_parser_try (GtkCssParser *parser,
226 gboolean skip_whitespace)
228 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
229 g_return_val_if_fail (string != NULL, FALSE);
231 if (g_ascii_strncasecmp (parser->data, string, strlen (string)) != 0)
234 parser->data += strlen (string);
237 _gtk_css_parser_skip_whitespace (parser);
253 _gtk_css_parser_unescape (GtkCssParser *parser,
259 g_assert (*parser->data == '\\');
263 for (i = 0; i < 6; i++)
265 if (!g_ascii_isxdigit (parser->data[i]))
268 result = (result << 4) + get_xdigit (parser->data[i]);
273 g_string_append_unichar (str, result);
276 /* NB: gtk_css_parser_new_line() forward data pointer itself */
277 if (!gtk_css_parser_new_line (parser) &&
279 strchr (WHITESPACE_CHARS, *parser->data))
284 if (gtk_css_parser_new_line (parser))
287 g_string_append_c (str, *parser->data);
294 _gtk_css_parser_read_char (GtkCssParser *parser,
296 const char * allowed)
298 if (*parser->data == 0)
301 if (strchr (allowed, *parser->data))
303 g_string_append_c (str, *parser->data);
307 if (*parser->data >= 127)
309 gsize len = g_utf8_skip[(guint) *(guchar *) parser->data];
311 g_string_append_len (str, parser->data, len);
315 if (*parser->data == '\\')
317 _gtk_css_parser_unescape (parser, str);
325 _gtk_css_parser_try_name (GtkCssParser *parser,
326 gboolean skip_whitespace)
330 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), NULL);
332 name = g_string_new (NULL);
334 while (_gtk_css_parser_read_char (parser, name, NMCHAR))
338 _gtk_css_parser_skip_whitespace (parser);
340 return g_string_free (name, FALSE);
344 _gtk_css_parser_try_ident (GtkCssParser *parser,
345 gboolean skip_whitespace)
350 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), NULL);
352 start = parser->data;
354 ident = g_string_new (NULL);
356 if (*parser->data == '-')
358 g_string_append_c (ident, '-');
362 if (!_gtk_css_parser_read_char (parser, ident, NMSTART))
364 parser->data = start;
365 g_string_free (ident, TRUE);
369 while (_gtk_css_parser_read_char (parser, ident, NMCHAR))
373 _gtk_css_parser_skip_whitespace (parser);
375 return g_string_free (ident, FALSE);
379 _gtk_css_parser_is_string (GtkCssParser *parser)
381 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
383 return *parser->data == '"' || *parser->data == '\'';
387 _gtk_css_parser_read_string (GtkCssParser *parser)
392 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), NULL);
394 quote = *parser->data;
396 if (quote != '"' && quote != '\'')
398 _gtk_css_parser_error (parser, "Expected a string.");
403 str = g_string_new (NULL);
407 gsize len = strcspn (parser->data, "\\'\"\n\r\f");
409 g_string_append_len (str, parser->data, len);
413 switch (*parser->data)
416 _gtk_css_parser_unescape (parser, str);
420 if (*parser->data == quote)
423 _gtk_css_parser_skip_whitespace (parser);
424 return g_string_free (str, FALSE);
427 g_string_append_c (str, *parser->data);
431 /* FIXME: position */
432 _gtk_css_parser_error (parser, "Missing end quote in string.");
433 g_string_free (str, TRUE);
436 _gtk_css_parser_error (parser,
437 "Invalid character in string. Must be escaped.");
438 g_string_free (str, TRUE);
443 g_assert_not_reached ();
448 _gtk_css_parser_try_int (GtkCssParser *parser,
454 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
455 g_return_val_if_fail (value != NULL, FALSE);
457 /* strtoll parses a plus, but we are not allowed to */
458 if (*parser->data == '+')
462 result = g_ascii_strtoll (parser->data, &end, 10);
465 if (result > G_MAXINT || result < G_MININT)
467 if (parser->data == end)
473 _gtk_css_parser_skip_whitespace (parser);
479 _gtk_css_parser_try_uint (GtkCssParser *parser,
485 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
486 g_return_val_if_fail (value != NULL, FALSE);
489 result = g_ascii_strtoull (parser->data, &end, 10);
492 if (result > G_MAXUINT)
494 if (parser->data == end)
500 _gtk_css_parser_skip_whitespace (parser);
506 _gtk_css_parser_try_double (GtkCssParser *parser,
512 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
513 g_return_val_if_fail (value != NULL, FALSE);
516 result = g_ascii_strtod (parser->data, &end);
519 if (parser->data == end)
525 _gtk_css_parser_skip_whitespace (parser);
531 _gtk_css_parser_has_number (GtkCssParser *parser)
534 return strchr ("+-0123456789.", parser->data[0]) != NULL;
538 _gtk_css_parser_read_number (GtkCssParser *parser,
539 GtkCssNumber *number,
540 GtkCssNumberParseFlags flags)
542 static const struct {
545 GtkCssNumberParseFlags required_flags;
547 { "px", GTK_CSS_PX, GTK_CSS_PARSE_LENGTH },
548 { "pt", GTK_CSS_PT, GTK_CSS_PARSE_LENGTH },
549 { "em", GTK_CSS_EM, GTK_CSS_PARSE_LENGTH },
550 { "ex", GTK_CSS_EX, GTK_CSS_PARSE_LENGTH },
551 { "pc", GTK_CSS_PC, GTK_CSS_PARSE_LENGTH },
552 { "in", GTK_CSS_IN, GTK_CSS_PARSE_LENGTH },
553 { "cm", GTK_CSS_CM, GTK_CSS_PARSE_LENGTH },
554 { "mm", GTK_CSS_MM, GTK_CSS_PARSE_LENGTH },
555 { "rad", GTK_CSS_RAD, GTK_CSS_PARSE_ANGLE },
556 { "deg", GTK_CSS_DEG, GTK_CSS_PARSE_ANGLE },
557 { "grad", GTK_CSS_GRAD, GTK_CSS_PARSE_ANGLE },
558 { "turn", GTK_CSS_TURN, GTK_CSS_PARSE_ANGLE }
562 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
563 g_return_val_if_fail (number != NULL, FALSE);
566 number->unit = GTK_CSS_NUMBER;
567 number->value = g_ascii_strtod (parser->data, &end);
570 _gtk_css_parser_error (parser, "not a number: %s", g_strerror (errno));
573 if (parser->data == end)
575 _gtk_css_parser_error (parser, "not a number");
581 if (flags & GTK_CSS_POSITIVE_ONLY &&
584 _gtk_css_parser_error (parser, "negative values are not allowed.");
588 unit = _gtk_css_parser_try_ident (parser, FALSE);
594 for (i = 0; i < G_N_ELEMENTS (units); i++)
596 if (flags & units[i].required_flags &&
597 g_ascii_strcasecmp (unit, units[i].name) == 0)
601 if (i >= G_N_ELEMENTS (units))
603 _gtk_css_parser_error (parser, "`%s' is not a valid unit.", unit);
608 number->unit = units[i].unit;
613 if ((flags & GTK_CSS_PARSE_PERCENT) &&
614 _gtk_css_parser_try (parser, "%", FALSE))
616 number->unit = GTK_CSS_PERCENT;
618 else if (number->value == 0.0)
620 if (flags & GTK_CSS_PARSE_NUMBER)
621 number->unit = GTK_CSS_NUMBER;
622 else if (flags & GTK_CSS_PARSE_LENGTH)
623 number->unit = GTK_CSS_PX;
625 number->unit = GTK_CSS_PERCENT;
627 else if (flags & GTK_CSS_NUMBER_AS_PIXELS)
629 GError *error = g_error_new_literal (GTK_CSS_PROVIDER_ERROR,
630 GTK_CSS_PROVIDER_ERROR_DEPRECATED,
631 "Not using units is deprecated. Assuming 'px'.");
632 _gtk_css_parser_take_error (parser, error);
633 number->unit = GTK_CSS_PX;
635 else if (flags & GTK_CSS_PARSE_NUMBER)
637 number->unit = GTK_CSS_NUMBER;
641 _gtk_css_parser_error (parser, "Unit is missing.");
646 _gtk_css_parser_skip_whitespace (parser);
651 /* XXX: we should introduce GtkCssLenght that deals with
652 * different kind of units */
654 _gtk_css_parser_try_length (GtkCssParser *parser,
657 if (!_gtk_css_parser_try_int (parser, value))
660 /* FIXME: _try_uint skips spaces while the
663 _gtk_css_parser_try (parser, "px", TRUE);
669 _gtk_css_parser_try_enum (GtkCssParser *parser,
673 GEnumClass *enum_class;
678 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), FALSE);
679 g_return_val_if_fail (value != NULL, FALSE);
683 enum_class = g_type_class_ref (enum_type);
685 start = parser->data;
687 str = _gtk_css_parser_try_ident (parser, TRUE);
691 if (enum_class->n_values)
693 GEnumValue *enum_value;
695 for (enum_value = enum_class->values; enum_value->value_name; enum_value++)
697 if (enum_value->value_nick &&
698 g_ascii_strcasecmp (str, enum_value->value_nick) == 0)
700 *value = enum_value->value;
708 g_type_class_unref (enum_class);
711 parser->data = start;
727 static GtkSymbolicColor *
728 gtk_css_parser_read_symbolic_color_function (GtkCssParser *parser,
731 GtkSymbolicColor *symbolic;
732 GtkSymbolicColor *child1, *child2;
735 if (!_gtk_css_parser_try (parser, "(", TRUE))
737 _gtk_css_parser_error (parser, "Missing opening bracket in color definition");
741 if (color == COLOR_RGB || color == COLOR_RGBA)
747 for (i = 0; i < 3; i++)
749 if (i > 0 && !_gtk_css_parser_try (parser, ",", TRUE))
751 _gtk_css_parser_error (parser, "Expected ',' in color definition");
755 if (!_gtk_css_parser_try_double (parser, &tmp))
757 _gtk_css_parser_error (parser, "Invalid number for color value");
760 if (_gtk_css_parser_try (parser, "%", TRUE))
771 g_assert_not_reached ();
774 if (color == COLOR_RGBA)
776 if (i > 0 && !_gtk_css_parser_try (parser, ",", TRUE))
778 _gtk_css_parser_error (parser, "Expected ',' in color definition");
782 if (!_gtk_css_parser_try_double (parser, &rgba.alpha))
784 _gtk_css_parser_error (parser, "Invalid number for alpha value");
791 symbolic = gtk_symbolic_color_new_literal (&rgba);
793 else if (color == COLOR_WIN32)
795 symbolic = _gtk_win32_theme_color_parse (parser);
796 if (symbolic == NULL)
801 child1 = _gtk_css_parser_read_symbolic_color (parser);
805 if (color == COLOR_MIX)
807 if (!_gtk_css_parser_try (parser, ",", TRUE))
809 _gtk_css_parser_error (parser, "Expected ',' in color definition");
810 gtk_symbolic_color_unref (child1);
814 child2 = _gtk_css_parser_read_symbolic_color (parser);
817 gtk_symbolic_color_unref (child1);
824 if (color == COLOR_LIGHTER)
826 else if (color == COLOR_DARKER)
830 if (!_gtk_css_parser_try (parser, ",", TRUE))
832 _gtk_css_parser_error (parser, "Expected ',' in color definition");
833 gtk_symbolic_color_unref (child1);
835 gtk_symbolic_color_unref (child2);
839 if (!_gtk_css_parser_try_double (parser, &value))
841 _gtk_css_parser_error (parser, "Expected number in color definition");
842 gtk_symbolic_color_unref (child1);
844 gtk_symbolic_color_unref (child2);
854 symbolic = gtk_symbolic_color_new_shade (child1, value);
857 symbolic = gtk_symbolic_color_new_alpha (child1, value);
860 symbolic = gtk_symbolic_color_new_mix (child1, child2, value);
863 g_assert_not_reached ();
867 gtk_symbolic_color_unref (child1);
869 gtk_symbolic_color_unref (child2);
872 if (!_gtk_css_parser_try (parser, ")", TRUE))
874 _gtk_css_parser_error (parser, "Expected ')' in color definition");
875 gtk_symbolic_color_unref (symbolic);
882 static GtkSymbolicColor *
883 gtk_css_parser_try_hash_color (GtkCssParser *parser)
885 if (parser->data[0] == '#' &&
886 g_ascii_isxdigit (parser->data[1]) &&
887 g_ascii_isxdigit (parser->data[2]) &&
888 g_ascii_isxdigit (parser->data[3]))
892 if (g_ascii_isxdigit (parser->data[4]) &&
893 g_ascii_isxdigit (parser->data[5]) &&
894 g_ascii_isxdigit (parser->data[6]))
896 rgba.red = ((get_xdigit (parser->data[1]) << 4) + get_xdigit (parser->data[2])) / 255.0;
897 rgba.green = ((get_xdigit (parser->data[3]) << 4) + get_xdigit (parser->data[4])) / 255.0;
898 rgba.blue = ((get_xdigit (parser->data[5]) << 4) + get_xdigit (parser->data[6])) / 255.0;
904 rgba.red = get_xdigit (parser->data[1]) / 15.0;
905 rgba.green = get_xdigit (parser->data[2]) / 15.0;
906 rgba.blue = get_xdigit (parser->data[3]) / 15.0;
911 _gtk_css_parser_skip_whitespace (parser);
913 return gtk_symbolic_color_new_literal (&rgba);
920 _gtk_css_parser_read_symbolic_color (GtkCssParser *parser)
922 GtkSymbolicColor *symbolic;
924 const char *names[] = {"rgba", "rgb", "lighter", "darker", "shade", "alpha", "mix",
925 GTK_WIN32_THEME_SYMBOLIC_COLOR_NAME};
928 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), NULL);
930 if (_gtk_css_parser_try (parser, "transparent", TRUE))
932 GdkRGBA transparent = { 0, 0, 0, 0 };
934 return gtk_symbolic_color_new_literal (&transparent);
937 if (_gtk_css_parser_try (parser, "@", FALSE))
939 name = _gtk_css_parser_try_name (parser, TRUE);
943 symbolic = gtk_symbolic_color_new_name (name);
947 _gtk_css_parser_error (parser, "'%s' is not a valid symbolic color name", name);
955 for (color = 0; color < G_N_ELEMENTS (names); color++)
957 if (_gtk_css_parser_try (parser, names[color], TRUE))
961 if (color < G_N_ELEMENTS (names))
962 return gtk_css_parser_read_symbolic_color_function (parser, color);
964 symbolic = gtk_css_parser_try_hash_color (parser);
968 name = _gtk_css_parser_try_name (parser, TRUE);
973 if (gdk_rgba_parse (&rgba, name))
975 symbolic = gtk_symbolic_color_new_literal (&rgba);
979 _gtk_css_parser_error (parser, "'%s' is not a valid color name", name);
986 _gtk_css_parser_error (parser, "Not a color definition");
991 _gtk_css_parser_read_url (GtkCssParser *parser,
998 if (_gtk_css_parser_try (parser, "url", FALSE))
1000 if (!_gtk_css_parser_try (parser, "(", TRUE))
1002 _gtk_css_parser_skip_whitespace (parser);
1003 if (_gtk_css_parser_try (parser, "(", TRUE))
1007 error = g_error_new_literal (GTK_CSS_PROVIDER_ERROR,
1008 GTK_CSS_PROVIDER_ERROR_DEPRECATED,
1009 "Whitespace between 'url' and '(' is deprecated");
1011 _gtk_css_parser_take_error (parser, error);
1015 _gtk_css_parser_error (parser, "Expected '(' after 'url'");
1020 path = _gtk_css_parser_read_string (parser);
1024 if (!_gtk_css_parser_try (parser, ")", TRUE))
1026 _gtk_css_parser_error (parser, "No closing ')' found for 'url'");
1031 scheme = g_uri_parse_scheme (path);
1034 file = g_file_new_for_uri (path);
1042 path = _gtk_css_parser_try_name (parser, TRUE);
1045 _gtk_css_parser_error (parser, "Not a valid url");
1050 file = g_file_resolve_relative_path (base, path);
1057 _gtk_css_parser_resync_internal (GtkCssParser *parser,
1058 gboolean sync_at_semicolon,
1059 gboolean read_sync_token,
1065 len = strcspn (parser->data, "\\\"'/()[]{};" NEWLINE_CHARS);
1066 parser->data += len;
1068 if (gtk_css_parser_new_line (parser))
1071 if (_gtk_css_parser_is_string (parser))
1073 /* Hrm, this emits errors, and i suspect it shouldn't... */
1074 char *free_me = _gtk_css_parser_read_string (parser);
1079 if (gtk_css_parser_skip_comment (parser))
1082 switch (*parser->data)
1086 GString *ignore = g_string_new (NULL);
1087 _gtk_css_parser_unescape (parser, ignore);
1088 g_string_free (ignore, TRUE);
1092 if (sync_at_semicolon && !read_sync_token)
1095 if (sync_at_semicolon)
1097 _gtk_css_parser_skip_whitespace (parser);
1103 _gtk_css_parser_resync (parser, FALSE, ')');
1109 _gtk_css_parser_resync (parser, FALSE, ']');
1115 _gtk_css_parser_resync (parser, FALSE, '}');
1118 if (sync_at_semicolon || !terminator)
1120 _gtk_css_parser_skip_whitespace (parser);
1127 if (terminator == *parser->data)
1129 _gtk_css_parser_skip_whitespace (parser);
1141 } while (*parser->data);
1145 _gtk_css_parser_read_value (GtkCssParser *parser)
1150 g_return_val_if_fail (GTK_IS_CSS_PARSER (parser), NULL);
1152 start = parser->data;
1154 /* This needs to be done better */
1155 _gtk_css_parser_resync_internal (parser, TRUE, FALSE, '}');
1157 result = g_strndup (start, parser->data - start);
1160 g_strchomp (result);
1169 _gtk_css_parser_error (parser, "Expected a property value");
1175 _gtk_css_parser_resync (GtkCssParser *parser,
1176 gboolean sync_at_semicolon,
1179 g_return_if_fail (GTK_IS_CSS_PARSER (parser));
1181 _gtk_css_parser_resync_internal (parser, sync_at_semicolon, TRUE, terminator);