Pileus Git - ~andy/gtk/blob - gtk/gtkcssprovider.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
   3  *
   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.
   8  *
   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.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <string.h>
  23 #include <stdlib.h>
  24
  25 #include <gdk-pixbuf/gdk-pixbuf.h>
  26 #include <cairo-gobject.h>
  27
  28 #include "gtkcssproviderprivate.h"
  29
  30 #include "gtkbitmaskprivate.h"
  31 #include "gtkcssstylefuncsprivate.h"
  32 #include "gtkcssparserprivate.h"
  33 #include "gtkcsssectionprivate.h"
  34 #include "gtkcssselectorprivate.h"
  35 #include "gtkcssshorthandpropertyprivate.h"
  36 #include "gtksymboliccolor.h"
  37 #include "gtkstyleprovider.h"
  38 #include "gtkstylecontextprivate.h"
  39 #include "gtkstylepropertiesprivate.h"
  40 #include "gtkstylepropertyprivate.h"
  41 #include "gtkstyleproviderprivate.h"
  42 #include "gtkbindings.h"
  43 #include "gtkmarshalers.h"
  44 #include "gtkprivate.h"
  45 #include "gtkintl.h"
  46
  47 /**
  48  * SECTION:gtkcssprovider
  49  * @Short_description: CSS-like styling for widgets
  50  * @Title: GtkCssProvider
  51  * @See_also: #GtkStyleContext, #GtkStyleProvider
  52  *
  53  * GtkCssProvider is an object implementing the #GtkStyleProvider interface.
  54  * It is able to parse <ulink url="http://www.w3.org/TR/CSS2">CSS</ulink>-like
  55  * input in order to style widgets.
  56  *
  57  * <refsect2 id="gtkcssprovider-files">
  58  * <title>Default files</title>
  59  * <para>
  60  * An application can cause GTK+ to parse a specific CSS style sheet by
  61  * calling gtk_css_provider_load_from_file() and adding the provider with
  62  * gtk_style_context_add_provider() or gtk_style_context_add_provider_for_screen().
  63  * In addition, certain files will be read when GTK+ is initialized. First,
  64  * the file <filename><envar>$XDG_CONFIG_HOME</envar>/gtk-3.0/gtk.css</filename>
  65  * is loaded if it exists. Then, GTK+ tries to load
  66  * <filename><envar>$HOME</envar>/.themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  67  * falling back to
  68  * <filename><replaceable>datadir</replaceable>/share/themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  69  * where <replaceable>theme-name</replaceable> is the name of the current theme
  70  * (see the #GtkSettings:gtk-theme-name setting) and <replaceable>datadir</replaceable>
  71  * is the prefix configured when GTK+ was compiled, unless overridden by the
  72  * <envar>GTK_DATA_PREFIX</envar> environment variable.
  73  * </para>
  74  * </refsect2>
  75  * <refsect2 id="gtkcssprovider-stylesheets">
  76  * <title>Style sheets</title>
  77  * <para>
  78  * The basic structure of the style sheets understood by this provider is
  79  * a series of statements, which are either rule sets or '@-rules', separated
  80  * by whitespace.
  81  * </para>
  82  * <para>
  83  * A rule set consists of a selector and a declaration block, which is
  84  * a series of declarations enclosed in curly braces ({ and }). The
  85  * declarations are separated by semicolons (;). Multiple selectors can
  86  * share the same declaration block, by putting all the separators in
  87  * front of the block, separated by commas.
  88  * </para>
  89  * <example><title>A rule set with two selectors</title>
  90  * <programlisting language="text">
  91  * GtkButton, GtkEntry {
  92  *     color: &num;ff00ea;
  93  *     font: Comic Sans 12
  94  * }
  95  * </programlisting>
  96  * </example>
  97  * </refsect2>
  98  * <refsect2 id="gtkcssprovider-selectors">
  99  * <title>Selectors</title>
 100  * <para>
 101  * Selectors work very similar to the way they do in CSS, with widget class
 102  * names taking the role of element names, and widget names taking the role
 103  * of IDs. When used in a selector, widget names must be prefixed with a
 104  * '&num;' character. The '*' character represents the so-called universal
 105  * selector, which matches any widget.
 106  * </para>
 107  * <para>
 108  * To express more complicated situations, selectors can be combined in
 109  * various ways:
 110  * <itemizedlist>
 111  * <listitem><para>To require that a widget satisfies several conditions,
 112  *   combine several selectors into one by concatenating them. E.g.
 113  *   <literal>GtkButton&num;button1</literal> matches a GtkButton widget
 114  *   with the name button1.</para></listitem>
 115  * <listitem><para>To only match a widget when it occurs inside some other
 116  *   widget, write the two selectors after each other, separated by whitespace.
 117  *   E.g. <literal>GtkToolBar GtkButton</literal> matches GtkButton widgets
 118  *   that occur inside a GtkToolBar.</para></listitem>
 119  * <listitem><para>In the previous example, the GtkButton is matched even
 120  *   if it occurs deeply nested inside the toolbar. To restrict the match
 121  *   to direct children of the parent widget, insert a '>' character between
 122  *   the two selectors. E.g. <literal>GtkNotebook > GtkLabel</literal> matches
 123  *   GtkLabel widgets that are direct children of a GtkNotebook.</para></listitem>
 124  * </itemizedlist>
 125  * </para>
 126  * <example>
 127  * <title>Widget classes and names in selectors</title>
 128  * <programlisting language="text">
 129  * /&ast; Theme labels that are descendants of a window &ast;/
 130  * GtkWindow GtkLabel {
 131  *     background-color: &num;898989
 132  * }
 133  *
 134  * /&ast; Theme notebooks, and anything that's within these &ast;/
 135  * GtkNotebook {
 136  *     background-color: &num;a939f0
 137  * }
 138  *
 139  * /&ast; Theme combo boxes, and entries that
 140  *  are direct children of a notebook &ast;/
 141  * GtkComboBox,
 142  * GtkNotebook > GtkEntry {
 143  *     color: @fg_color;
 144  *     background-color: &num;1209a2
 145  * }
 146  *
 147  * /&ast; Theme any widget within a GtkBin &ast;/
 148  * GtkBin * {
 149  *     font: Sans 20
 150  * }
 151  *
 152  * /&ast; Theme a label named title-label &ast;/
 153  * GtkLabel&num;title-label {
 154  *     font: Sans 15
 155  * }
 156  *
 157  * /&ast; Theme any widget named main-entry &ast;/
 158  * &num;main-entry {
 159  *     background-color: &num;f0a810
 160  * }
 161  * </programlisting>
 162  * </example>
 163  * <para>
 164  * Widgets may also define style classes, which can be used for matching.
 165  * When used in a selector, style classes must be prefixed with a '.'
 166  * character.
 167  * </para>
 168  * <para>
 169  * Refer to the documentation of individual widgets to learn which
 170  * style classes they define and see <xref linkend="gtkstylecontext-classes"/>
 171  * for a list of all style classes used by GTK+ widgets.
 172  * </para>
 173  * <para>
 174  * Note that there is some ambiguity in the selector syntax when it comes
 175  * to differentiation widget class names from regions. GTK+ currently treats
 176  * a string as a widget class name if it contains any uppercase characters
 177  * (which should work for more widgets with names like GtkLabel).
 178  * </para>
 179  * <example>
 180  * <title>Style classes in selectors</title>
 181  * <programlisting language="text">
 182  * /&ast; Theme all widgets defining the class entry &ast;/
 183  * .entry {
 184  *     color: &num;39f1f9;
 185  * }
 186  *
 187  * /&ast; Theme spinbuttons' entry &ast;/
 188  * GtkSpinButton.entry {
 189  *     color: &num;900185
 190  * }
 191  * </programlisting>
 192  * </example>
 193  * <para>
 194  * In complicated widgets like e.g. a GtkNotebook, it may be desirable
 195  * to style different parts of the widget differently. To make this
 196  * possible, container widgets may define regions, whose names
 197  * may be used for matching in selectors.
 198  * </para>
 199  * <para>
 200  * Some containers allow to further differentiate between regions by
 201  * applying so-called pseudo-classes to the region. For example, the
 202  * tab region in GtkNotebook allows to single out the first or last
 203  * tab by using the :first-child or :last-child pseudo-class.
 204  * When used in selectors, pseudo-classes must be prefixed with a
 205  * ':' character.
 206  * </para>
 207  * <para>
 208  * Refer to the documentation of individual widgets to learn which
 209  * regions and pseudo-classes they define and see
 210  * <xref linkend="gtkstylecontext-classes"/> for a list of all regions
 211  * used by GTK+ widgets.
 212  * </para>
 213  * <example>
 214  * <title>Regions in selectors</title>
 215  * <programlisting language="text">
 216  * /&ast; Theme any label within a notebook &ast;/
 217  * GtkNotebook GtkLabel {
 218  *     color: &num;f90192;
 219  * }
 220  *
 221  * /&ast; Theme labels within notebook tabs &ast;/
 222  * GtkNotebook tab GtkLabel {
 223  *     color: &num;703910;
 224  * }
 225  *
 226  * /&ast; Theme labels in the any first notebook
 227  *  tab, both selectors are equivalent &ast;/
 228  * GtkNotebook tab:nth-child(first) GtkLabel,
 229  * GtkNotebook tab:first-child GtkLabel {
 230  *     color: &num;89d012;
 231  * }
 232  * </programlisting>
 233  * </example>
 234  * <para>
 235  * Another use of pseudo-classes is to match widgets depending on their
 236  * state. This is conceptually similar to the :hover, :active or :focus
 237  * pseudo-classes in CSS. The available pseudo-classes for widget states
 238  * are :active, :prelight (or :hover), :insensitive, :selected, :focused
 239  * and :inconsistent.
 240  * </para>
 241  * <example>
 242  * <title>Styling specific widget states</title>
 243  * <programlisting language="text">
 244  * /&ast; Theme active (pressed) buttons &ast;/
 245  * GtkButton:active {
 246  *     background-color: &num;0274d9;
 247  * }
 248  *
 249  * /&ast; Theme buttons with the mouse pointer on it,
 250  *    both are equivalent &ast;/
 251  * GtkButton:hover,
 252  * GtkButton:prelight {
 253  *     background-color: &num;3085a9;
 254  * }
 255  *
 256  * /&ast; Theme insensitive widgets, both are equivalent &ast;/
 257  * :insensitive,
 258  * *:insensitive {
 259  *     background-color: &num;320a91;
 260  * }
 261  *
 262  * /&ast; Theme selection colors in entries &ast;/
 263  * GtkEntry:selected {
 264  *     background-color: &num;56f9a0;
 265  * }
 266  *
 267  * /&ast; Theme focused labels &ast;/
 268  * GtkLabel:focused {
 269  *     background-color: &num;b4940f;
 270  * }
 271  *
 272  * /&ast; Theme inconsistent checkbuttons &ast;/
 273  * GtkCheckButton:inconsistent {
 274  *     background-color: &num;20395a;
 275  * }
 276  * </programlisting>
 277  * </example>
 278  * <para>
 279  * Widget state pseudoclasses may only apply to the last element
 280  * in a selector.
 281  * </para>
 282  * <para>
 283  * To determine the effective style for a widget, all the matching rule
 284  * sets are merged. As in CSS, rules apply by specificity, so the rules
 285  * whose selectors more closely match a widget path will take precedence
 286  * over the others.
 287  * </para>
 288  * </refsect2>
 289  * <refsect2 id="gtkcssprovider-rules">
 290  * <title>&commat; Rules</title>
 291  * <para>
 292  * GTK+'s CSS supports the &commat;import rule, in order to load another
 293  * CSS style sheet in addition to the currently parsed one.
 294  * </para>
 295  * <example>
 296  * <title>Using the &commat;import rule</title>
 297  * <programlisting language="text">
 298  * &commat;import url ("path/to/common.css");
 299  * </programlisting>
 300  * </example>
 301  * <para id="css-binding-set">
 302  * In order to extend key bindings affecting different widgets, GTK+
 303  * supports the &commat;binding-set rule to parse a set of bind/unbind
 304  * directives, see #GtkBindingSet for the supported syntax. Note that
 305  * the binding sets defined in this way must be associated with rule sets
 306  * by setting the gtk-key-bindings style property.
 307  * </para>
 308  * <para>
 309  * Customized key bindings are typically defined in a separate
 310  * <filename>gtk-keys.css</filename> CSS file and GTK+ loads this file
 311  * according to the current key theme, which is defined by the
 312  * #GtkSettings:gtk-key-theme-name setting.
 313  * </para>
 314  * <example>
 315  * <title>Using the &commat;binding rule</title>
 316  * <programlisting language="text">
 317  * &commat;binding-set binding-set1 {
 318  *   bind "&lt;alt&gt;Left" { "move-cursor" (visual-positions, -3, 0) };
 319  *   unbind "End";
 320  * };
 321  *
 322  * &commat;binding-set binding-set2 {
 323  *   bind "&lt;alt&gt;Right" { "move-cursor" (visual-positions, 3, 0) };
 324  *   bind "&lt;alt&gt;KP_space" { "delete-from-cursor" (whitespace, 1)
 325  *                          "insert-at-cursor" (" ") };
 326  * };
 327  *
 328  * GtkEntry {
 329  *   gtk-key-bindings: binding-set1, binding-set2;
 330  * }
 331  * </programlisting>
 332  * </example>
 333  * <para>
 334  * GTK+ also supports an additional &commat;define-color rule, in order
 335  * to define a color name which may be used instead of color numeric
 336  * representations. Also see the #GtkSettings:gtk-color-scheme setting
 337  * for a way to override the values of these named colors.
 338  * </para>
 339  * <example>
 340  * <title>Defining colors</title>
 341  * <programlisting language="text">
 342  * &commat;define-color bg_color &num;f9a039;
 343  *
 344  * &ast; {
 345  *     background-color: &commat;bg_color;
 346  * }
 347  * </programlisting>
 348  * </example>
 349  * </refsect2>
 350  * <refsect2 id="gtkcssprovider-symbolic-colors">
 351  * <title>Symbolic colors</title>
 352  * <para>
 353  * Besides being able to define color names, the CSS parser is also able
 354  * to read different color expressions, which can also be nested, providing
 355  * a rich language to define colors which are derived from a set of base
 356  * colors.
 357  * </para>
 358  * <example>
 359  * <title>Using symbolic colors</title>
 360  * <programlisting language="text">
 361  * &commat;define-color entry-color shade (&commat;bg_color, 0.7);
 362  *
 363  * GtkEntry {
 364  *     background-color: @entry-color;
 365  * }
 366  *
 367  * GtkEntry:focused {
 368  *     background-color: mix (&commat;entry-color,
 369  *                            shade (&num;fff, 0.5),
 370  *                            0.8);
 371  * }
 372  * </programlisting>
 373  * </example>
 374  * <para>
 375  *   The various ways to express colors in GTK+ CSS are:
 376  * </para>
 377  * <informaltable>
 378  *   <tgroup cols="3">
 379  *     <thead>
 380  *       <row>
 381  *         <entry>Syntax</entry>
 382  *         <entry>Explanation</entry>
 383  *         <entry>Examples</entry>
 384  *       </row>
 385  *     </thead>
 386  *     <tbody>
 387  *       <row>
 388  *         <entry>rgb(@r, @g, @b)</entry>
 389  *         <entry>An opaque color; @r, @g, @b can be either integers between
 390  *                0 and 255 or percentages</entry>
 391  *         <entry><literallayout>rgb(128, 10, 54)
 392  * rgb(20%, 30%, 0%)</literallayout></entry>
 393  *       </row>
 394  *       <row>
 395  *         <entry>rgba(@r, @g, @b, @a)</entry>
 396  *         <entry>A translucent color; @r, @g, @b are as in the previous row,
 397  *                @a is a floating point number between 0 and 1</entry>
 398  *         <entry><literallayout>rgba(255, 255, 0, 0.5)</literallayout></entry>
 399  *       </row>
 400  *       <row>
 401  *         <entry>&num;@xxyyzz</entry>
 402  *         <entry>An opaque color; @xx, @yy, @zz are hexadecimal numbers
 403  *                specifying @r, @g, @b variants with between 1 and 4
 404  *                hexadecimal digits per component are allowed</entry>
 405  *         <entry><literallayout>&num;ff12ab
 406  * &num;f0c</literallayout></entry>
 407  *       </row>
 408  *       <row>
 409  *         <entry>&commat;name</entry>
 410  *         <entry>Reference to a color that has been defined with
 411  *                &commat;define-color
 412  *         </entry>
 413  *         <entry>&commat;bg_color</entry>
 414  *       </row>
 415  *       <row>
 416  *         <entry>mix(@color1, @color2, @f)</entry>
 417  *         <entry>A linear combination of @color1 and @color2. @f is a
 418  *                floating point number between 0 and 1.</entry>
 419  *         <entry><literallayout>mix(&num;ff1e0a, &commat;bg_color, 0.8)</literallayout></entry>
 420  *       </row>
 421  *       <row>
 422  *         <entry>shade(@color, @f)</entry>
 423  *         <entry>A lighter or darker variant of @color. @f is a
 424  *                floating point number.
 425  *         </entry>
 426  *         <entry>shade(&commat;fg_color, 0.5)</entry>
 427  *       </row>
 428  *       <row>
 429  *         <entry>lighter(@color)</entry>
 430  *         <entry>A lighter variant of @color</entry>
 431  *       </row>
 432  *       <row>
 433  *         <entry>darker(@color)</entry>
 434  *         <entry>A darker variant of @color</entry>
 435  *       </row>
 436  *     </tbody>
 437  *   </tgroup>
 438  * </informaltable>
 439  * </refsect2>
 440  * <refsect2 id="gtkcssprovider-gradients">
 441  * <title>Gradients</title>
 442  * <para>
 443  * Linear or radial Gradients can be used as background images.
 444  * </para>
 445  * <para>
 446  * A linear gradient along the line from (@start_x, @start_y) to
 447  * (@end_x, @end_y) is specified using the syntax
 448  * <literallayout>-gtk-gradient (linear,
 449  *               @start_x @start_y, @end_x @end_y,
 450  *               color-stop (@position, @color),
 451  *               ...)</literallayout>
 452  * where @start_x and @end_x can be either a floating point number between
 453  * 0 and 1 or one of the special values 'left', 'right' or 'center', @start_y
 454  * and @end_y can be either a floating point number between 0 and 1 or one
 455  * of the special values 'top', 'bottom' or 'center', @position is a floating
 456  * point number between 0 and 1 and @color is a color expression (see above).
 457  * The color-stop can be repeated multiple times to add more than one color
 458  * stop. 'from (@color)' and 'to (@color)' can be used as abbreviations for
 459  * color stops with position 0 and 1, respectively.
 460  * </para>
 461  * <example>
 462  * <title>A linear gradient</title>
 463  * <inlinegraphic fileref="gradient1.png" format="PNG"/>
 464  * <para>This gradient was specified with
 465  * <literallayout>-gtk-gradient (linear,
 466  *                left top, right bottom,
 467  *                from(&commat;yellow), to(&commat;blue))</literallayout></para>
 468  * </example>
 469  * <example>
 470  * <title>Another linear gradient</title>
 471  * <inlinegraphic fileref="gradient2.png" format="PNG"/>
 472  * <para>This gradient was specified with
 473  * <literallayout>-gtk-gradient (linear,
 474  *                0 0, 0 1,
 475  *                color-stop(0, &commat;yellow),
 476  *                color-stop(0.2, &commat;blue),
 477  *                color-stop(1, &num;0f0))</literallayout></para>
 478  * </example>
 479  * <para>
 480  * A radial gradient along the two circles defined by (@start_x, @start_y,
 481  * @start_radius) and (@end_x, @end_y, @end_radius) is specified using the
 482  * syntax
 483  * <literallayout>-gtk-gradient (radial,
 484  *                @start_x @start_y, @start_radius,
 485  *                @end_x @end_y, @end_radius,
 486  *                color-stop (@position, @color),
 487  *                ...)</literallayout>
 488  * where @start_radius and @end_radius are floating point numbers and
 489  * the other parameters are as before.
 490  * </para>
 491  * <example>
 492  * <title>A radial gradient</title>
 493  * <inlinegraphic fileref="gradient3.png" format="PNG"/>
 494  * <para>This gradient was specified with
 495  * <literallayout>-gtk-gradient (radial,
 496  *                center center, 0,
 497  *                center center, 1,
 498  *                from(&commat;yellow), to(&commat;green))</literallayout></para>
 499  * </example>
 500  * <example>
 501  * <title>Another radial gradient</title>
 502  * <inlinegraphic fileref="gradient4.png" format="PNG"/>
 503  * <para>This gradient was specified with
 504  * <literallayout>-gtk-gradient (radial,
 505  *                0.4 0.4, 0.1,
 506  *                0.6 0.6, 0.7,
 507  *                color-stop (0, &num;f00),
 508  *                color-stop (0.1, &num;a0f),
 509  *                color-stop (0.2, &commat;yellow),
 510  *                color-stop (1, &commat;green))</literallayout></para>
 511  * </example>
 512  * </refsect2>
 513  * <refsect2 id="gtkcssprovider-shadows">
 514  * <title>Text shadow</title>
 515  * <para>
 516  * A shadow list can be applied to text or symbolic icons, using the CSS3
 517  * text-shadow syntax, as defined in
 518  * <ulink url="http://www.w3.org/TR/css3-text/#text-shadow">the CSS3 specification</ulink>.
 519  * </para>
 520  * <para>
 521  * A text shadow is specified using the syntax
 522  * <literallayout>text-shadow: @horizontal_offset @vertical_offset [ @blur_radius ] @color</literallayout>
 523  * The offset of the shadow is specified with the @horizontal_offset and @vertical_offset
 524  * parameters. The optional blur radius is parsed, but it is currently not rendered by
 525  * the GTK+ theming engine.
 526  * </para>
 527  * <para>
 528  * To set multiple shadows on an element, you can specify a comma-separated list
 529  * of shadow elements in the text-shadow property. Shadows are always rendered
 530  * front-back, i.e. the first shadow specified is on top of the others. Shadows
 531  * can thus overlay each other, but they can never overlay the text itself,
 532  * which is always rendered on top of the shadow layer.
 533  * </para>
 534  * </refsect2>
 535  * <refsect2>
 536  * <title>Box shadow</title>
 537  * <para>
 538  * Themes can apply shadows on framed elements using the CSS3 box-shadow syntax,
 539  * as defined in
 540  * <ulink url="http://www.w3.org/TR/css3-background/#the-box-shadow">the CSS3 specification</ulink>.
 541  * </para>
 542  * <para>
 543  * A box shadow is specified using the syntax
 544  * <literallayout>box-shadow: [ @inset ] @horizontal_offset @vertical_offset [ @blur_radius ] [ @spread ] @color</literallayout>
 545  * A positive offset will draw a shadow that is offset to the right (down) of the box,
 546  * a negative offset to the left (top). The optional spread parameter defines an additional
 547  * distance to expand the shadow shape in all directions, by the specified radius.
 548  * The optional blur radius parameter is parsed, but it is currently not rendered by
 549  * the GTK+ theming engine.
 550  * The inset parameter defines whether the drop shadow should be rendered inside or outside
 551  * the box canvas. Only inset box-shadows are currently supported by the GTK+ theming engine,
 552  * non-inset elements are currently ignored.
 553  * </para>
 554  * <para>
 555  * To set multiple box-shadows on an element, you can specify a comma-separated list
 556  * of shadow elements in the box-shadow property. Shadows are always rendered
 557  * front-back, i.e. the first shadow specified is on top of the others, so they may
 558  * overlap other boxes or other shadows.
 559  * </para>
 560  * </refsect2>
 561  * <refsect2 id="gtkcssprovider-border-image">
 562  * <title>Border images</title>
 563  * <para>
 564  * Images and gradients can also be used in slices for the purpose of creating
 565  * scalable borders.
 566  * For more information, see the CSS3 documentation for the border-image property,
 567  * which can be found <ulink url="http://www.w3.org/TR/css3-background/#border-images">here</ulink>.
 568  * </para>
 569  * <inlinegraphic fileref="slices.png" format="PNG"/>
 570  * <para>
 571  * The parameters of the slicing process are controlled by
 572  * four separate properties. Note that you can use the
 573  * <literallayout>border-image</literallayout> shorthand property
 574  * to set values for the three properties at the same time.
 575  * </para>
 576  * <para>
 577  * <literallayout>border-image-source: url(@path)
 578  * (or border-image-source: -gtk-gradient(...))</literallayout>:
 579  * Specifies the source of the border image, and it can either
 580  * be an URL or a gradient (see above).
 581  * </para>
 582  * <para>
 583  * <literallayout>border-image-slice: @top @right @bottom @left</literallayout>
 584  * The sizes specified by the @top, @right, @bottom and @left parameters
 585  * are the offsets, in pixels, from the relevant edge where the image
 586  * should be "cut off" to build the slices used for the rendering
 587  * of the border.
 588  * </para>
 589  * <para>
 590  * <literallayout>border-image-width: @top @right @bottom @left</literallayout>
 591  * The sizes specified by the @top, @right, @bottom and @left parameters
 592  * are inward distances from the border box edge, used to specify the
 593  * rendered size of each slice determined by border-image-slice.
 594  * If this property is not specified, the values of border-width will
 595  * be used as a fallback.
 596  * </para>
 597  * <para>
 598  * <literallayout>border-image-repeat: [stretch|repeat|round|space] ?
 599  * [stretch|repeat|round|space]</literallayout>
 600  * Specifies how the image slices should be rendered in the area
 601  * outlined by border-width.
 602  * The default (stretch) is to resize the slice to fill in the whole
 603  * allocated area.
 604  * If the value of this property is 'repeat', the image slice
 605  * will be tiled to fill the area.
 606  * If the value of this property is 'round', the image slice will
 607  * be tiled to fill the area, and scaled to fit it exactly
 608  * a whole number of times.
 609  * If the value of this property is 'space', the image slice will
 610  * be tiled to fill the area, and if it doesn't fit it exactly a whole
 611  * number of times, the extra space is distributed as padding around
 612  * the slices.
 613  * If two options are specified, the first one affects
 614  * the horizontal behaviour and the second one the vertical behaviour.
 615  * If only one option is specified, it affects both.
 616  * </para>
 617  * <example>
 618  * <title>A border image</title>
 619  * <inlinegraphic fileref="border1.png" format="PNG"/>
 620  * <para>This border image was specified with
 621  * <literallayout>url("gradient1.png") 10 10 10 10</literallayout>
 622  * </para>
 623  * </example>
 624  * <example>
 625  * <title>A repeating border image</title>
 626  * <inlinegraphic fileref="border2.png" format="PNG"/>
 627  * <para>This border image was specified with
 628  * <literallayout>url("gradient1.png") 10 10 10 10 repeat</literallayout>
 629  * </para>
 630  * </example>
 631  * <example>
 632  * <title>A stretched border image</title>
 633  * <inlinegraphic fileref="border3.png" format="PNG"/>
 634  * <para>This border image was specified with
 635  * <literallayout>url("gradient1.png") 10 10 10 10 stretch</literallayout>
 636  * </para>
 637  * </example>
 638  * </refsect2>
 639  * <refsect2 id="gtkcssprovider-transitions">
 640  * <para>Styles can specify transitions that will be used to create a gradual
 641  * change in the appearance when a widget state changes. The following
 642  * syntax is used to specify transitions:
 643  * <literallayout>@duration [s|ms] [linear|ease|ease-in|ease-out|ease-in-out] [loop]?</literallayout>
 644  * The @duration is the amount of time that the animation will take for
 645  * a complete cycle from start to end. If the loop option is given, the
 646  * animation will be repated until the state changes again.
 647  * The option after the duration determines the transition function from a
 648  * small set of predefined functions.
 649  * <figure><title>Linear transition</title>
 650  * <graphic fileref="linear.png" format="PNG"/>
 651  * </figure>
 652  * <figure><title>Ease transition</title>
 653  * <graphic fileref="ease.png" format="PNG"/>
 654  * </figure>
 655  * <figure><title>Ease-in-out transition</title>
 656  * <graphic fileref="ease-in-out.png" format="PNG"/>
 657  * </figure>
 658  * <figure><title>Ease-in transition</title>
 659  * <graphic fileref="ease-in.png" format="PNG"/>
 660  * </figure>
 661  * <figure><title>Ease-out transition</title>
 662  * <graphic fileref="ease-out.png" format="PNG"/>
 663  * </figure>
 664  * </para>
 665  * </refsect2>
 666  * <refsect2 id="gtkcssprovider-properties">
 667  * <title>Supported properties</title>
 668  * <para>
 669  * Properties are the part that differ the most to common CSS,
 670  * not all properties are supported (some are planned to be
 671  * supported eventually, some others are meaningless or don't
 672  * map intuitively in a widget based environment).
 673  * </para>
 674  * <para>
 675  * The currently supported properties are:
 676  * </para>
 677  * <informaltable>
 678  *   <tgroup cols="4">
 679  *     <thead>
 680  *       <row>
 681  *         <entry>Property name</entry>
 682  *         <entry>Syntax</entry>
 683  *         <entry>Maps to</entry>
 684  *         <entry>Examples</entry>
 685  *       </row>
 686  *     </thead>
 687  *     <tbody>
 688  *       <row>
 689  *         <entry>engine</entry>
 690  *         <entry>engine-name</entry>
 691  *         <entry>#GtkThemingEngine</entry>
 692  *         <entry>engine: clearlooks;
 693  *  engine: none; /&ast; use the default (i.e. builtin) engine) &ast;/ </entry>
 694  *       </row>
 695  *       <row>
 696  *         <entry>background-color</entry>
 697  *         <entry morerows="2">color (see above)</entry>
 698  *         <entry morerows="7">#GdkRGBA</entry>
 699  *         <entry morerows="7"><literallayout>background-color: &num;fff;
 700  * color: &amp;color1;
 701  * background-color: shade (&amp;color1, 0.5);
 702  * color: mix (&amp;color1, &num;f0f, 0.8);</literallayout>
 703  *         </entry>
 704  *       </row>
 705  *       <row>
 706  *         <entry>color</entry>
 707  *       </row>
 708  *       <row>
 709  *         <entry>border-top-color</entry>
 710  *         <entry morerows="4">transparent|color (see above)</entry>
 711  *       </row>
 712  *       <row>
 713  *         <entry>border-right-color</entry>
 714  *       </row>
 715  *       <row>
 716  *         <entry>border-bottom-color</entry>
 717  *       </row>
 718  *       <row>
 719  *         <entry>border-left-color</entry>
 720  *       </row>
 721  *       <row>
 722  *         <entry>border-color</entry>
 723  *         <entry>[transparent|color]{1,4}</entry>
 724  *       </row>
 725  *       <row>
 726  *         <entry>font-family</entry>
 727  *         <entry>@family [, @family]*</entry>
 728  *         <entry>#gchararray</entry>
 729  *         <entry>font-family: Sans, Arial;</entry>
 730  *       </row>
 731  *       <row>
 732  *         <entry>font-style</entry>
 733  *         <entry>[normal|oblique|italic]</entry>
 734  *         <entry>#PANGO_TYPE_STYLE</entry>
 735  *         <entry>font-style: italic;</entry>
 736  *       </row>
 737  *       <row>
 738  *         <entry>font-variant</entry>
 739  *         <entry>[normal|small-caps]</entry>
 740  *         <entry>#PANGO_TYPE_VARIANT</entry>
 741  *         <entry>font-variant: normal;</entry>
 742  *       </row>
 743  *       <row>
 744  *         <entry>font-weight</entry>
 745  *         <entry>[normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900]</entry>
 746  *         <entry>#PANGO_TYPE_WEIGHT</entry>
 747  *         <entry>font-weight: bold;</entry>
 748  *       </row>
 749  *       <row>
 750  *         <entry>font-size</entry>
 751  *         <entry>Font size in point</entry>
 752  *         <entry>#gint</entry>
 753  *         <entry>font-size: 13;</entry>
 754  *       </row>
 755  *       <row>
 756  *         <entry>font</entry>
 757  *         <entry>@family [@style] [@size]</entry>
 758  *         <entry>#PangoFontDescription</entry>
 759  *         <entry>font: Sans 15;</entry>
 760  *       </row>
 761  *       <row>
 762  *         <entry>margin-top</entry>
 763  *         <entry>integer</entry>
 764  *         <entry>#gint</entry>
 765  *         <entry>margin-top: 0;</entry>
 766  *       </row>
 767  *       <row>
 768  *         <entry>margin-left</entry>
 769  *         <entry>integer</entry>
 770  *         <entry>#gint</entry>
 771  *         <entry>margin-left: 1;</entry>
 772  *       </row>
 773  *       <row>
 774  *         <entry>margin-bottom</entry>
 775  *         <entry>integer</entry>
 776  *         <entry>#gint</entry>
 777  *         <entry>margin-bottom: 2;</entry>
 778  *       </row>
 779  *       <row>
 780  *         <entry>margin-right</entry>
 781  *         <entry>integer</entry>
 782  *         <entry>#gint</entry>
 783  *         <entry>margin-right: 4;</entry>
 784  *       </row>
 785  *       <row>
 786  *         <entry>margin</entry>
 787  *         <entry morerows="1"><literallayout>@width
 788  * @vertical_width @horizontal_width
 789  * @top_width @horizontal_width @bottom_width
 790  * @top_width @right_width @bottom_width @left_width</literallayout>
 791  *         </entry>
 792  *         <entry morerows="1">#GtkBorder</entry>
 793  *         <entry morerows="1"><literallayout>margin: 5;
 794  * margin: 5 10;
 795  * margin: 5 10 3;
 796  * margin: 5 10 3 5;</literallayout>
 797  *         </entry>
 798  *       </row>
 799  *       <row>
 800  *         <entry>padding-top</entry>
 801  *         <entry>integer</entry>
 802  *         <entry>#gint</entry>
 803  *         <entry>padding-top: 5;</entry>
 804  *       </row>
 805  *       <row>
 806  *         <entry>padding-left</entry>
 807  *         <entry>integer</entry>
 808  *         <entry>#gint</entry>
 809  *         <entry>padding-left: 5;</entry>
 810  *       </row>
 811  *       <row>
 812  *         <entry>padding-bottom</entry>
 813  *         <entry>integer</entry>
 814  *         <entry>#gint</entry>
 815  *         <entry>padding-bottom: 5;</entry>
 816  *       </row>
 817  *       <row>
 818  *         <entry>padding-right</entry>
 819  *         <entry>integer</entry>
 820  *         <entry>#gint</entry>
 821  *         <entry>padding-right: 5;</entry>
 822  *       </row>
 823  *       <row>
 824  *         <entry>padding</entry>
 825  *       </row>
 826  *       <row>
 827  *         <entry>background-image</entry>
 828  *         <entry><literallayout>gradient (see above) or
 829  * url(@path)</literallayout></entry>
 830  *         <entry>#cairo_pattern_t</entry>
 831  *         <entry><literallayout>-gtk-gradient (linear,
 832  *                left top, right top,
 833  *                from (&num;fff), to (&num;000));
 834  * -gtk-gradient (linear, 0.0 0.5, 0.5 1.0,
 835  *                from (&num;fff),
 836  *                color-stop (0.5, &num;f00),
 837  *                to (&num;000));
 838  * -gtk-gradient (radial,
 839  *                center center, 0.2,
 840  *                center center, 0.8,
 841  *                color-stop (0.0, &num;fff),
 842  *                color-stop (1.0, &num;000));
 843  * url ('background.png');</literallayout>
 844  *         </entry>
 845  *       </row>
 846  *       <row>
 847  *         <entry>background-repeat</entry>
 848  *         <entry>[repeat|no-repeat]</entry>
 849  *         <entry>internal</entry>
 850  *         <entry><literallayout>background-repeat: no-repeat;</literallayout>
 851  *                If not specified, the style doesn't respect the CSS3
 852  *                specification, since the background will be
 853  *                stretched to fill the area.
 854  *         </entry>
 855  *       </row>
 856  *       <row>
 857  *         <entry>border-top-width</entry>
 858  *         <entry>integer</entry>
 859  *         <entry>#gint</entry>
 860  *         <entry>border-top-width: 5;</entry>
 861  *       </row>
 862  *       <row>
 863  *         <entry>border-left-width</entry>
 864  *         <entry>integer</entry>
 865  *         <entry>#gint</entry>
 866  *         <entry>border-left-width: 5;</entry>
 867  *       </row>
 868  *       <row>
 869  *         <entry>border-bottom-width</entry>
 870  *         <entry>integer</entry>
 871  *         <entry>#gint</entry>
 872  *         <entry>border-bottom-width: 5;</entry>
 873  *       </row>
 874  *       <row>
 875  *         <entry>border-right-width</entry>
 876  *         <entry>integer</entry>
 877  *         <entry>#gint</entry>
 878  *         <entry>border-right-width: 5;</entry>
 879  *       </row>
 880  *       <row>
 881  *         <entry>border-width</entry>
 882  *         <entry morerows="1">#GtkBorder</entry>
 883  *         <entry morerows="1"><literallayout>border-width: 1;
 884  * border-width: 1 2;
 885  * border-width: 1 2 3;
 886  * border-width: 1 2 3 5;</literallayout>
 887  *         </entry>
 888  *       </row>
 889  *       <row>
 890  *         <entry>border-radius</entry>
 891  *         <entry>integer</entry>
 892  *         <entry>#gint</entry>
 893  *         <entry>border-radius: 5;</entry>
 894  *       </row>
 895  *       <row>
 896  *         <entry>border-style</entry>
 897  *         <entry>[none|solid|inset|outset]</entry>
 898  *         <entry>#GtkBorderStyle</entry>
 899  *         <entry>border-style: solid;</entry>
 900  *       </row>
 901  *       <row>
 902  *         <entry>border-image</entry>
 903  *         <entry><literallayout>border image (see above)</literallayout></entry>
 904  *         <entry>internal use only</entry>
 905  *         <entry><literallayout>border-image: url("/path/to/image.png") 3 4 3 4 stretch;
 906  * border-image: url("/path/to/image.png") 3 4 4 3 repeat stretch;</literallayout>
 907  *         </entry>
 908  *       </row>
 909  *       <row>
 910  *         <entry>text-shadow</entry>
 911  *         <entry>shadow list (see above)</entry>
 912  *         <entry>#GtkTextShadow</entry>
 913  *         <entry><literallayout>text-shadow: 1 1 0 blue, -4 -4 red;</literallayout></entry>
 914  *       </row>
 915  *       <row>
 916  *         <entry>transition</entry>
 917  *         <entry>transition (see above)</entry>
 918  *         <entry>internal use only</entry>
 919  *         <entry><literallayout>transition: 150ms ease-in-out;
 920  * transition: 1s linear loop;</literallayout>
 921  *         </entry>
 922  *       </row>
 923  *       <row>
 924  *         <entry>gtk-key-bindings</entry>
 925  *         <entry>binding set name list</entry>
 926  *         <entry>internal use only</entry>
 927  *         <entry><literallayout>gtk-bindings: binding1, binding2, ...;</literallayout>
 928  *         </entry>
 929  *       </row>
 930  *     </tbody>
 931  *   </tgroup>
 932  * </informaltable>
 933  * <para>
 934  * GtkThemingEngines can register their own, engine-specific style properties
 935  * with the function gtk_theming_engine_register_property(). These properties
 936  * can be set in CSS like other properties, using a name of the form
 937  * <literallayout>-<replaceable>namespace</replaceable>-<replaceable>name</replaceable></literallayout>, where <replaceable>namespace</replaceable> is typically
 938  * the name of the theming engine, and <replaceable>name</replaceable> is the
 939  * name of the property. Style properties that have been registered by widgets
 940  * using gtk_widget_class_install_style_property() can also be set in this
 941  * way, using the widget class name for <replaceable>namespace</replaceable>.
 942  * </para>
 943  * <example>
 944  * <title>Using engine-specific style properties</title>
 945  * <programlisting>
 946  * * {
 947  *     engine: clearlooks;
 948  *     border-radius: 4;
 949  *     -GtkPaned-handle-size: 6;
 950  *     -clearlooks-colorize-scrollbar: false;
 951  * }
 952  * </programlisting>
 953  * </example>
 954  * </refsect2>
 955  */
 956
 957 typedef struct GtkCssRuleset GtkCssRuleset;
 958 typedef struct _GtkCssScanner GtkCssScanner;
 959 typedef enum ParserScope ParserScope;
 960 typedef enum ParserSymbol ParserSymbol;
 961
 962 struct GtkCssRuleset
 963 {
 964   GtkCssSelector *selector;
 965   GHashTable *widget_style;
 966   GHashTable *style;
 967   GtkBitmask *set_styles;
 968 };
 969
 970 struct _GtkCssScanner
 971 {
 972   GtkCssProvider *provider;
 973   GtkCssParser *parser;
 974   GtkCssSection *section;
 975   GtkCssScanner *parent;
 976   GFile *file;
 977   GFile *base;
 978   GSList *state;
 979 };
 980
 981 struct _GtkCssProviderPrivate
 982 {
 983   GScanner *scanner;
 984
 985   GHashTable *symbolic_colors;
 986
 987   GArray *rulesets;
 988 };
 989
 990 enum {
 991   PARSING_ERROR,
 992   LAST_SIGNAL
 993 };
 994
 995 static guint css_provider_signals[LAST_SIGNAL] = { 0 };
 996
 997 static void gtk_css_provider_finalize (GObject *object);
 998 static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
 999 static void gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface);
1000
1001 static gboolean
1002 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
1003                                 GtkCssScanner  *scanner,
1004                                 GFile          *file,
1005                                 const char     *data,
1006                                 GError        **error);
1007
1008 GQuark
1009 gtk_css_provider_error_quark (void)
1010 {
1011   return g_quark_from_static_string ("gtk-css-provider-error-quark");
1012 }
1013
1014 G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
1015                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
1016                                                gtk_css_style_provider_iface_init)
1017                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER_PRIVATE,
1018                                                gtk_css_style_provider_private_iface_init));
1019
1020 static void
1021 gtk_css_provider_parsing_error (GtkCssProvider  *provider,
1022                                 GtkCssSection   *section,
1023                                 const GError    *error)
1024 {
1025   /* Only emit a warning when we have no error handlers. This is our
1026    * default handlers. And in this case erroneous CSS files are a bug
1027    * and should be fixed.
1028    * Note that these warnings can also be triggered by a broken theme
1029    * that people installed from some weird location on the internets.
1030    */
1031   if (!g_signal_has_handler_pending (provider,
1032                                      css_provider_signals[PARSING_ERROR],
1033                                      0,
1034                                      TRUE))
1035     {
1036       GFileInfo *info;
1037       GFile *file;
1038       const char *path;
1039
1040       file = gtk_css_section_get_file (section);
1041       if (file)
1042         {
1043           info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1044
1045           if (info)
1046             path = g_file_info_get_display_name (info);
1047           else
1048             path = "<broken file>";
1049         }
1050       else
1051         {
1052           info = NULL;
1053           path = "<data>";
1054         }
1055
1056       g_warning ("Theme parsing error: %s:%u:%u: %s",
1057                  path,
1058                  gtk_css_section_get_end_line (section) + 1,
1059                  gtk_css_section_get_end_position (section),
1060                  error->message);
1061
1062       if (info)
1063         g_object_unref (info);
1064     }
1065 }
1066
1067 static void
1068 gtk_css_provider_class_init (GtkCssProviderClass *klass)
1069 {
1070   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1071
1072   /**
1073    * GtkCssProvider::parsing-error:
1074    * @provider: the provider that had a parsing error
1075    * @section: section the error happened in
1076    * @error: The parsing error
1077    *
1078    * Signals that a parsing error occured. the @path, @line and @position
1079    * describe the actual location of the error as accurately as possible.
1080    *
1081    * Parsing errors are never fatal, so the parsing will resume after
1082    * the error. Errors may however cause parts of the given
1083    * data or even all of it to not be parsed at all. So it is a useful idea
1084    * to check that the parsing succeeds by connecting to this signal.
1085    *
1086    * Note that this signal may be emitted at any time as the css provider
1087    * may opt to defer parsing parts or all of the input to a later time
1088    * than when a loading function was called.
1089    */
1090   css_provider_signals[PARSING_ERROR] =
1091     g_signal_new (I_("parsing-error"),
1092                   G_TYPE_FROM_CLASS (object_class),
1093                   G_SIGNAL_RUN_LAST,
1094                   G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
1095                   NULL, NULL,
1096                   _gtk_marshal_VOID__BOXED_BOXED,
1097                   G_TYPE_NONE, 2, GTK_TYPE_CSS_SECTION, G_TYPE_ERROR);
1098
1099   object_class->finalize = gtk_css_provider_finalize;
1100
1101   klass->parsing_error = gtk_css_provider_parsing_error;
1102
1103   g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
1104 }
1105
1106 static void
1107 gtk_css_ruleset_init_copy (GtkCssRuleset       *new,
1108                            const GtkCssRuleset *ruleset,
1109                            GtkCssSelector      *selector)
1110 {
1111   memcpy (new, ruleset, sizeof (GtkCssRuleset));
1112
1113   new->selector = selector;
1114   if (new->widget_style)
1115     g_hash_table_ref (new->widget_style);
1116   if (new->style)
1117     g_hash_table_ref (new->style);
1118   if (new->set_styles)
1119     new->set_styles = _gtk_bitmask_copy (new->set_styles);
1120 }
1121
1122 static void
1123 gtk_css_ruleset_clear (GtkCssRuleset *ruleset)
1124 {
1125   if (ruleset->style)
1126     g_hash_table_unref (ruleset->style);
1127   if (ruleset->set_styles)
1128     _gtk_bitmask_free (ruleset->set_styles);
1129   if (ruleset->widget_style)
1130     g_hash_table_unref (ruleset->widget_style);
1131   if (ruleset->selector)
1132     _gtk_css_selector_free (ruleset->selector);
1133
1134   memset (ruleset, 0, sizeof (GtkCssRuleset));
1135 }
1136
1137 typedef struct _PropertyValue PropertyValue;
1138 struct _PropertyValue {
1139   GtkCssSection *section;
1140   GValue         value;
1141 };
1142
1143 static PropertyValue *
1144 property_value_new (GtkCssSection *section)
1145 {
1146   PropertyValue *value;
1147
1148   value = g_slice_new0 (PropertyValue);
1149
1150   value->section = gtk_css_section_ref (section);
1151
1152   return value;
1153 }
1154
1155 static void
1156 property_value_free (PropertyValue *value)
1157 {
1158   if (G_IS_VALUE (&value->value))
1159     g_value_unset (&value->value);
1160
1161   gtk_css_section_unref (value->section);
1162
1163   g_slice_free (PropertyValue, value);
1164 }
1165
1166 static void
1167 gtk_css_ruleset_add_style (GtkCssRuleset *ruleset,
1168                            char          *name,
1169                            PropertyValue *value)
1170 {
1171   if (ruleset->widget_style == NULL)
1172     ruleset->widget_style = g_hash_table_new_full (g_str_hash,
1173                                                    g_str_equal,
1174                                                    (GDestroyNotify) g_free,
1175                                                    (GDestroyNotify) property_value_free);
1176
1177   g_hash_table_insert (ruleset->widget_style, name, value);
1178 }
1179
1180 static void
1181 gtk_css_ruleset_add (GtkCssRuleset    *ruleset,
1182                      GtkStyleProperty *prop,
1183                      PropertyValue    *value)
1184 {
1185   if (ruleset->style == NULL)
1186     {
1187       ruleset->style = g_hash_table_new_full (g_direct_hash,
1188                                               g_direct_equal,
1189                                               NULL,
1190                                               (GDestroyNotify) property_value_free);
1191       ruleset->set_styles = _gtk_bitmask_new ();
1192     }
1193
1194   if (GTK_IS_CSS_SHORTHAND_PROPERTY (prop))
1195     {
1196       GtkCssShorthandProperty *shorthand = GTK_CSS_SHORTHAND_PROPERTY (prop);
1197       GValueArray *array = g_value_get_boxed (&value->value);
1198       guint i;
1199
1200       for (i = 0; i < _gtk_css_shorthand_property_get_n_subproperties (shorthand); i++)
1201         {
1202           GtkCssStyleProperty *child = _gtk_css_shorthand_property_get_subproperty (shorthand, i);
1203           PropertyValue *val;
1204
1205           val = property_value_new (value->section);
1206           g_value_init (&val->value, G_VALUE_TYPE (g_value_array_get_nth (array, i)));
1207           g_value_copy (g_value_array_get_nth (array, i), &val->value);
1208           gtk_css_ruleset_add (ruleset, GTK_STYLE_PROPERTY (child), val);
1209         }
1210       property_value_free (value);
1211     }
1212   else if (GTK_IS_CSS_STYLE_PROPERTY (prop))
1213     {
1214       _gtk_bitmask_set (ruleset->set_styles,
1215                         _gtk_css_style_property_get_id (GTK_CSS_STYLE_PROPERTY (prop)),
1216                         TRUE);
1217       g_hash_table_insert (ruleset->style, prop, value);
1218     }
1219   else
1220     {
1221       g_assert_not_reached ();
1222     }
1223 }
1224
1225 static gboolean
1226 gtk_css_ruleset_matches (GtkCssRuleset *ruleset,
1227                          GtkWidgetPath *path,
1228                          GtkStateFlags  state)
1229 {
1230   return _gtk_css_selector_matches (ruleset->selector, path, state);
1231 }
1232
1233 static void
1234 gtk_css_scanner_destroy (GtkCssScanner *scanner)
1235 {
1236   if (scanner->section)
1237     gtk_css_section_unref (scanner->section);
1238   g_object_unref (scanner->provider);
1239   if (scanner->file)
1240     g_object_unref (scanner->file);
1241   g_object_unref (scanner->base);
1242   _gtk_css_parser_free (scanner->parser);
1243
1244   g_slice_free (GtkCssScanner, scanner);
1245 }
1246
1247 static void
1248 gtk_css_provider_emit_error (GtkCssProvider *provider,
1249                              GtkCssScanner  *scanner,
1250                              const GError   *error)
1251 {
1252   g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
1253                  scanner != NULL ? scanner->section : NULL, error);
1254 }
1255
1256 static void
1257 gtk_css_scanner_parser_error (GtkCssParser *parser,
1258                               const GError *error,
1259                               gpointer      user_data)
1260 {
1261   GtkCssScanner *scanner = user_data;
1262
1263   gtk_css_provider_emit_error (scanner->provider,
1264                                scanner,
1265                                error);
1266 }
1267
1268 static GtkCssScanner *
1269 gtk_css_scanner_new (GtkCssProvider *provider,
1270                      GtkCssScanner  *parent,
1271                      GtkCssSection  *section,
1272                      GFile          *file,
1273                      const gchar    *text)
1274 {
1275   GtkCssScanner *scanner;
1276
1277   scanner = g_slice_new0 (GtkCssScanner);
1278
1279   g_object_ref (provider);
1280   scanner->provider = provider;
1281   scanner->parent = parent;
1282   if (section)
1283     scanner->section = gtk_css_section_ref (section);
1284
1285   if (file)
1286     {
1287       scanner->file = g_object_ref (file);
1288       scanner->base = g_file_get_parent (file);
1289     }
1290   else
1291     {
1292       char *dir = g_get_current_dir ();
1293       scanner->base = g_file_new_for_path (dir);
1294       g_free (dir);
1295     }
1296
1297   scanner->parser = _gtk_css_parser_new (text,
1298                                          gtk_css_scanner_parser_error,
1299                                          scanner);
1300
1301   return scanner;
1302 }
1303
1304 static GFile *
1305 gtk_css_scanner_get_base_url (GtkCssScanner *scanner)
1306 {
1307   return scanner->base;
1308 }
1309
1310 static gboolean
1311 gtk_css_scanner_would_recurse (GtkCssScanner *scanner,
1312                                GFile         *file)
1313 {
1314   while (scanner)
1315     {
1316       if (scanner->file && g_file_equal (scanner->file, file))
1317         return TRUE;
1318
1319       scanner = scanner->parent;
1320     }
1321
1322   return FALSE;
1323 }
1324
1325 static void
1326 gtk_css_scanner_push_section (GtkCssScanner     *scanner,
1327                               GtkCssSectionType  section_type)
1328 {
1329   GtkCssSection *section;
1330
1331   section = _gtk_css_section_new (scanner->section,
1332                                   section_type,
1333                                   scanner->parser,
1334                                   scanner->file);
1335
1336   if (scanner->section)
1337     gtk_css_section_unref (scanner->section);
1338   scanner->section = section;
1339 }
1340
1341 static void
1342 gtk_css_scanner_pop_section (GtkCssScanner *scanner,
1343                              GtkCssSectionType check_type)
1344 {
1345   GtkCssSection *parent;
1346
1347   g_assert (gtk_css_section_get_section_type (scanner->section) == check_type);
1348
1349   parent = gtk_css_section_get_parent (scanner->section);
1350   if (parent)
1351     gtk_css_section_ref (parent);
1352
1353   _gtk_css_section_end (scanner->section);
1354   gtk_css_section_unref (scanner->section);
1355
1356   scanner->section = parent;
1357 }
1358
1359 static void
1360 gtk_css_provider_init (GtkCssProvider *css_provider)
1361 {
1362   GtkCssProviderPrivate *priv;
1363
1364   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1365                                                            GTK_TYPE_CSS_PROVIDER,
1366                                                            GtkCssProviderPrivate);
1367
1368   priv->rulesets = g_array_new (FALSE, FALSE, sizeof (GtkCssRuleset));
1369
1370   priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
1371                                                  (GDestroyNotify) g_free,
1372                                                  (GDestroyNotify) gtk_symbolic_color_unref);
1373 }
1374
1375 static void
1376 css_provider_dump_symbolic_colors (GtkCssProvider     *css_provider,
1377                                    GtkStyleProperties *props)
1378 {
1379   GtkCssProviderPrivate *priv;
1380   GHashTableIter iter;
1381   gpointer key, value;
1382
1383   priv = css_provider->priv;
1384   g_hash_table_iter_init (&iter, priv->symbolic_colors);
1385
1386   while (g_hash_table_iter_next (&iter, &key, &value))
1387     {
1388       const gchar *name;
1389       GtkSymbolicColor *color;
1390
1391       name = key;
1392       color = value;
1393
1394       gtk_style_properties_map_color (props, name, color);
1395     }
1396 }
1397
1398 static GtkStyleProperties *
1399 gtk_css_provider_get_style (GtkStyleProvider *provider,
1400                             GtkWidgetPath    *path)
1401 {
1402   GtkCssProvider *css_provider;
1403   GtkCssProviderPrivate *priv;
1404   GtkStyleProperties *props;
1405   guint i;
1406
1407   css_provider = GTK_CSS_PROVIDER (provider);
1408   priv = css_provider->priv;
1409   props = gtk_style_properties_new ();
1410
1411   css_provider_dump_symbolic_colors (css_provider, props);
1412
1413   for (i = 0; i < priv->rulesets->len; i++)
1414     {
1415       GtkCssRuleset *ruleset;
1416       GHashTableIter iter;
1417       gpointer key, val;
1418
1419       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1420
1421       if (ruleset->style == NULL)
1422         continue;
1423
1424       if (!gtk_css_ruleset_matches (ruleset, path, 0))
1425         continue;
1426
1427       g_hash_table_iter_init (&iter, ruleset->style);
1428
1429       while (g_hash_table_iter_next (&iter, &key, &val))
1430         {
1431           GtkCssStyleProperty *prop = key;
1432           PropertyValue *value = val;
1433
1434           _gtk_style_properties_set_property_by_property (props,
1435                                                           prop,
1436                                                           _gtk_css_selector_get_state_flags (ruleset->selector),
1437                                                           &value->value);
1438         }
1439     }
1440
1441   return props;
1442 }
1443
1444 static gboolean
1445 gtk_css_provider_get_style_property (GtkStyleProvider *provider,
1446                                      GtkWidgetPath    *path,
1447                                      GtkStateFlags     state,
1448                                      GParamSpec       *pspec,
1449                                      GValue           *value)
1450 {
1451   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1452   GtkCssProviderPrivate *priv = css_provider->priv;
1453   PropertyValue *val;
1454   gboolean found = FALSE;
1455   gchar *prop_name;
1456   gint i;
1457
1458   prop_name = g_strdup_printf ("-%s-%s",
1459                                g_type_name (pspec->owner_type),
1460                                pspec->name);
1461
1462   for (i = priv->rulesets->len - 1; i >= 0; i--)
1463     {
1464       GtkCssRuleset *ruleset;
1465
1466       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1467
1468       if (ruleset->widget_style == NULL)
1469         continue;
1470
1471       if (!gtk_css_ruleset_matches (ruleset, path, state))
1472         continue;
1473
1474       val = g_hash_table_lookup (ruleset->widget_style, prop_name);
1475
1476       if (val)
1477         {
1478           GtkCssScanner *scanner;
1479
1480           scanner = gtk_css_scanner_new (css_provider,
1481                                          NULL,
1482                                          val->section,
1483                                          gtk_css_section_get_file (val->section),
1484                                          g_value_get_string (&val->value));
1485
1486           found = _gtk_css_style_parse_value (value,
1487                                               scanner->parser,
1488                                               NULL);
1489
1490           gtk_css_scanner_destroy (scanner);
1491
1492           if (found)
1493             break;
1494         }
1495     }
1496
1497   g_free (prop_name);
1498
1499   return found;
1500 }
1501
1502 static void
1503 gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
1504 {
1505   iface->get_style = gtk_css_provider_get_style;
1506   iface->get_style_property = gtk_css_provider_get_style_property;
1507 }
1508
1509 static GtkSymbolicColor *
1510 gtk_css_style_provider_get_color (GtkStyleProviderPrivate *provider,
1511                                   const char              *name)
1512 {
1513   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1514
1515   return g_hash_table_lookup (css_provider->priv->symbolic_colors, name);
1516 }
1517
1518 static void
1519 gtk_css_style_provider_lookup (GtkStyleProviderPrivate *provider,
1520                                GtkWidgetPath           *path,
1521                                GtkStateFlags            state,
1522                                GtkCssLookup            *lookup)
1523 {
1524   GtkCssProvider *css_provider;
1525   GtkCssProviderPrivate *priv;
1526   int i;
1527
1528   css_provider = GTK_CSS_PROVIDER (provider);
1529   priv = css_provider->priv;
1530
1531   for (i = priv->rulesets->len - 1; i >= 0; i--)
1532     {
1533       GtkCssRuleset *ruleset;
1534       GHashTableIter iter;
1535       gpointer key, val;
1536
1537       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1538
1539       if (ruleset->style == NULL)
1540         continue;
1541
1542       if (!_gtk_bitmask_intersects (_gtk_css_lookup_get_missing (lookup),
1543                                     ruleset->set_styles))
1544         continue;
1545
1546       if (!gtk_css_ruleset_matches (ruleset, path, state))
1547         continue;
1548
1549       g_hash_table_iter_init (&iter, ruleset->style);
1550
1551       while (g_hash_table_iter_next (&iter, &key, &val))
1552         {
1553           GtkCssStyleProperty *prop = key;
1554           PropertyValue *value = val;
1555           guint id = _gtk_css_style_property_get_id (prop);
1556
1557           if (!_gtk_css_lookup_is_missing (lookup, id))
1558             continue;
1559
1560           _gtk_css_lookup_set (lookup, id, value->section, &value->value);
1561         }
1562     }
1563 }
1564
1565 static void
1566 gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface)
1567 {
1568   iface->get_color = gtk_css_style_provider_get_color;
1569   iface->lookup = gtk_css_style_provider_lookup;
1570 }
1571
1572 static void
1573 gtk_css_provider_finalize (GObject *object)
1574 {
1575   GtkCssProvider *css_provider;
1576   GtkCssProviderPrivate *priv;
1577   guint i;
1578
1579   css_provider = GTK_CSS_PROVIDER (object);
1580   priv = css_provider->priv;
1581
1582   for (i = 0; i < priv->rulesets->len; i++)
1583     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1584
1585   g_array_free (priv->rulesets, TRUE);
1586
1587   if (priv->symbolic_colors)
1588     g_hash_table_destroy (priv->symbolic_colors);
1589
1590   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1591 }
1592
1593 /**
1594  * gtk_css_provider_new:
1595  *
1596  * Returns a newly created #GtkCssProvider.
1597  *
1598  * Returns: A new #GtkCssProvider
1599  **/
1600 GtkCssProvider *
1601 gtk_css_provider_new (void)
1602 {
1603   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1604 }
1605
1606 static void
1607 gtk_css_provider_take_error (GtkCssProvider *provider,
1608                              GtkCssScanner  *scanner,
1609                              GError         *error)
1610 {
1611   gtk_css_provider_emit_error (provider,
1612                                scanner,
1613                                error);
1614
1615   g_error_free (error);
1616 }
1617
1618 static void
1619 gtk_css_provider_error_literal (GtkCssProvider *provider,
1620                                 GtkCssScanner  *scanner,
1621                                 GQuark          domain,
1622                                 gint            code,
1623                                 const char     *message)
1624 {
1625   gtk_css_provider_take_error (provider,
1626                                scanner,
1627                                g_error_new_literal (domain, code, message));
1628 }
1629
1630 static void
1631 gtk_css_provider_error (GtkCssProvider *provider,
1632                         GtkCssScanner  *scanner,
1633                         GQuark          domain,
1634                         gint            code,
1635                         const char     *format,
1636                         ...)  G_GNUC_PRINTF (5, 6);
1637 static void
1638 gtk_css_provider_error (GtkCssProvider *provider,
1639                         GtkCssScanner  *scanner,
1640                         GQuark          domain,
1641                         gint            code,
1642                         const char     *format,
1643                         ...)
1644 {
1645   GError *error;
1646   va_list args;
1647
1648   va_start (args, format);
1649   error = g_error_new_valist (domain, code, format, args);
1650   va_end (args);
1651
1652   gtk_css_provider_take_error (provider, scanner, error);
1653 }
1654
1655 static void
1656 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1657                                 GtkCssScanner  *scanner,
1658                                 const char     *expected)
1659 {
1660   gtk_css_provider_error (provider,
1661                           scanner,
1662                           GTK_CSS_PROVIDER_ERROR,
1663                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1664                           "expected a valid %s", expected);
1665 }
1666
1667 static void
1668 css_provider_commit (GtkCssProvider *css_provider,
1669                      GSList         *selectors,
1670                      GtkCssRuleset  *ruleset)
1671 {
1672   GtkCssProviderPrivate *priv;
1673   GSList *l;
1674
1675   priv = css_provider->priv;
1676
1677   if (ruleset->style == NULL && ruleset->widget_style == NULL)
1678     {
1679       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
1680       return;
1681     }
1682
1683   for (l = selectors; l; l = l->next)
1684     {
1685       GtkCssRuleset new;
1686
1687       gtk_css_ruleset_init_copy (&new, ruleset, l->data);
1688
1689       g_array_append_val (priv->rulesets, new);
1690     }
1691
1692   g_slist_free (selectors);
1693 }
1694
1695 static void
1696 gtk_css_provider_reset (GtkCssProvider *css_provider)
1697 {
1698   GtkCssProviderPrivate *priv;
1699   guint i;
1700
1701   priv = css_provider->priv;
1702
1703   g_hash_table_remove_all (priv->symbolic_colors);
1704
1705   for (i = 0; i < priv->rulesets->len; i++)
1706     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1707   g_array_set_size (priv->rulesets, 0);
1708 }
1709
1710 static void
1711 gtk_css_provider_propagate_error (GtkCssProvider  *provider,
1712                                   GtkCssSection   *section,
1713                                   const GError    *error,
1714                                   GError         **propagate_to)
1715 {
1716
1717   GFileInfo *info;
1718   GFile *file;
1719   const char *path;
1720
1721   file = gtk_css_section_get_file (section);
1722   if (file)
1723     {
1724       info = g_file_query_info (file,G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1725
1726       if (info)
1727         path = g_file_info_get_display_name (info);
1728       else
1729         path = "<broken file>";
1730     }
1731   else
1732     {
1733       info = NULL;
1734       path = "<unknown>";
1735     }
1736
1737   /* don't fail for deprecations */
1738   if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
1739     {
1740       g_warning ("Theme parsing error: %s:%u:%u: %s", path,
1741                  gtk_css_section_get_end_line (section) + 1,
1742                  gtk_css_section_get_end_position (section), error->message);
1743       return;
1744     }
1745
1746   /* we already set an error. And we'd like to keep the first one */
1747   if (*propagate_to)
1748     return;
1749
1750   *propagate_to = g_error_copy (error);
1751   g_prefix_error (propagate_to, "%s:%u:%u: ", path,
1752                   gtk_css_section_get_end_line (section) + 1,
1753                   gtk_css_section_get_end_position (section));
1754
1755   if (info)
1756     g_object_unref (info);
1757 }
1758
1759 static gboolean
1760 parse_import (GtkCssScanner *scanner)
1761 {
1762   GFile *file;
1763
1764   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_IMPORT);
1765
1766   if (!_gtk_css_parser_try (scanner->parser, "@import", TRUE))
1767     {
1768       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1769       return FALSE;
1770     }
1771
1772   if (_gtk_css_parser_is_string (scanner->parser))
1773     {
1774       char *uri;
1775
1776       uri = _gtk_css_parser_read_string (scanner->parser);
1777       file = g_file_resolve_relative_path (gtk_css_scanner_get_base_url (scanner), uri);
1778       g_free (uri);
1779     }
1780   else
1781     {
1782       file = _gtk_css_parser_read_url (scanner->parser,
1783                                        gtk_css_scanner_get_base_url (scanner));
1784     }
1785
1786   if (file == NULL)
1787     {
1788       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1789       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1790       return TRUE;
1791     }
1792
1793   if (!_gtk_css_parser_try (scanner->parser, ";", FALSE))
1794     {
1795       gtk_css_provider_invalid_token (scanner->provider, scanner, "semicolon");
1796       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1797     }
1798   else if (gtk_css_scanner_would_recurse (scanner, file))
1799     {
1800        char *path = g_file_get_path (file);
1801        gtk_css_provider_error (scanner->provider,
1802                                scanner,
1803                                GTK_CSS_PROVIDER_ERROR,
1804                                GTK_CSS_PROVIDER_ERROR_IMPORT,
1805                                "Loading '%s' would recurse",
1806                                path);
1807        g_free (path);
1808     }
1809   else
1810     {
1811       gtk_css_provider_load_internal (scanner->provider,
1812                                       scanner,
1813                                       file,
1814                                       NULL,
1815                                       NULL);
1816     }
1817
1818   g_object_unref (file);
1819
1820   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1821   _gtk_css_parser_skip_whitespace (scanner->parser);
1822
1823   return TRUE;
1824 }
1825
1826 static gboolean
1827 parse_color_definition (GtkCssScanner *scanner)
1828 {
1829   GtkSymbolicColor *symbolic;
1830   char *name;
1831
1832   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1833
1834   if (!_gtk_css_parser_try (scanner->parser, "@define-color", TRUE))
1835     {
1836       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1837       return FALSE;
1838     }
1839
1840   name = _gtk_css_parser_try_name (scanner->parser, TRUE);
1841   if (name == NULL)
1842     {
1843       gtk_css_provider_error_literal (scanner->provider,
1844                                       scanner,
1845                                       GTK_CSS_PROVIDER_ERROR,
1846                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1847                                       "Not a valid color name");
1848       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1849       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1850       return TRUE;
1851     }
1852
1853   symbolic = _gtk_css_parser_read_symbolic_color (scanner->parser);
1854   if (symbolic == NULL)
1855     {
1856       g_free (name);
1857       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1858       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1859       return TRUE;
1860     }
1861
1862   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1863     {
1864       g_free (name);
1865       gtk_symbolic_color_unref (symbolic);
1866       gtk_css_provider_error_literal (scanner->provider,
1867                                       scanner,
1868                                       GTK_CSS_PROVIDER_ERROR,
1869                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1870                                       "Missing semicolon at end of color definition");
1871       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1872
1873       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1874       return TRUE;
1875     }
1876
1877   g_hash_table_insert (scanner->provider->priv->symbolic_colors, name, symbolic);
1878
1879   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1880   return TRUE;
1881 }
1882
1883 static gboolean
1884 parse_binding_set (GtkCssScanner *scanner)
1885 {
1886   GtkBindingSet *binding_set;
1887   char *name;
1888
1889   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1890
1891   if (!_gtk_css_parser_try (scanner->parser, "@binding-set", TRUE))
1892     {
1893       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1894       return FALSE;
1895     }
1896
1897   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1898   if (name == NULL)
1899     {
1900       gtk_css_provider_error_literal (scanner->provider,
1901                                       scanner,
1902                                       GTK_CSS_PROVIDER_ERROR,
1903                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1904                                       "Expected name for binding set");
1905       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1906       goto skip_semicolon;
1907     }
1908
1909   binding_set = gtk_binding_set_find (name);
1910   if (!binding_set)
1911     {
1912       binding_set = gtk_binding_set_new (name);
1913       binding_set->parsed = TRUE;
1914     }
1915   g_free (name);
1916
1917   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
1918     {
1919       gtk_css_provider_error_literal (scanner->provider,
1920                                       scanner,
1921                                       GTK_CSS_PROVIDER_ERROR,
1922                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1923                                       "Expected '{' for binding set");
1924       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1925       goto skip_semicolon;
1926     }
1927
1928   while (!_gtk_css_parser_is_eof (scanner->parser) &&
1929          !_gtk_css_parser_begins_with (scanner->parser, '}'))
1930     {
1931       name = _gtk_css_parser_read_value (scanner->parser);
1932       if (name == NULL)
1933         {
1934           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1935           continue;
1936         }
1937
1938       if (gtk_binding_entry_add_signal_from_string (binding_set, name) != G_TOKEN_NONE)
1939         {
1940           gtk_css_provider_error_literal (scanner->provider,
1941                                           scanner,
1942                                           GTK_CSS_PROVIDER_ERROR,
1943                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1944                                           "Failed to parse binding set.");
1945         }
1946
1947       g_free (name);
1948
1949       if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1950         {
1951           if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
1952               !_gtk_css_parser_is_eof (scanner->parser))
1953             {
1954               gtk_css_provider_error_literal (scanner->provider,
1955                                               scanner,
1956                                               GTK_CSS_PROVIDER_ERROR,
1957                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
1958                                               "Expected semicolon");
1959               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1960             }
1961         }
1962     }
1963
1964   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
1965     {
1966       gtk_css_provider_error_literal (scanner->provider,
1967                                       scanner,
1968                                       GTK_CSS_PROVIDER_ERROR,
1969                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1970                                       "expected '}' after declarations");
1971       if (!_gtk_css_parser_is_eof (scanner->parser))
1972         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
1973     }
1974
1975 skip_semicolon:
1976   if (_gtk_css_parser_begins_with (scanner->parser, ';'))
1977     {
1978       gtk_css_provider_error_literal (scanner->provider,
1979                                       scanner,
1980                                       GTK_CSS_PROVIDER_ERROR,
1981                                       GTK_CSS_PROVIDER_ERROR_DEPRECATED,
1982                                       "Nonstandard semicolon at end of binding set");
1983       _gtk_css_parser_try (scanner->parser, ";", TRUE);
1984     }
1985
1986   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1987
1988   return TRUE;
1989 }
1990
1991 static void
1992 parse_at_keyword (GtkCssScanner *scanner)
1993 {
1994   if (parse_import (scanner))
1995     return;
1996   if (parse_color_definition (scanner))
1997     return;
1998   if (parse_binding_set (scanner))
1999     return;
2000
2001   else
2002     {
2003       gtk_css_provider_error_literal (scanner->provider,
2004                                       scanner,
2005                                       GTK_CSS_PROVIDER_ERROR,
2006                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2007                                       "unknown @ rule");
2008       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2009     }
2010 }
2011
2012 static gboolean
2013 parse_selector_class (GtkCssScanner *scanner, GArray *classes)
2014 {
2015   GQuark qname;
2016   char *name;
2017
2018   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
2019
2020   if (name == NULL)
2021     {
2022       gtk_css_provider_error_literal (scanner->provider,
2023                                       scanner,
2024                                       GTK_CSS_PROVIDER_ERROR,
2025                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2026                                       "Expected a valid name for class");
2027       return FALSE;
2028     }
2029
2030   qname = g_quark_from_string (name);
2031   g_array_append_val (classes, qname);
2032   g_free (name);
2033   return TRUE;
2034 }
2035
2036 static gboolean
2037 parse_selector_name (GtkCssScanner *scanner, GArray *names)
2038 {
2039   GQuark qname;
2040   char *name;
2041
2042   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
2043
2044   if (name == NULL)
2045     {
2046       gtk_css_provider_error_literal (scanner->provider,
2047                                       scanner,
2048                                       GTK_CSS_PROVIDER_ERROR,
2049                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2050                                       "Expected a valid name for id");
2051       return FALSE;
2052     }
2053
2054   qname = g_quark_from_string (name);
2055   g_array_append_val (names, qname);
2056   g_free (name);
2057   return TRUE;
2058 }
2059
2060 static gboolean
2061 parse_selector_pseudo_class (GtkCssScanner  *scanner,
2062                              GtkRegionFlags *region_to_modify,
2063                              GtkStateFlags  *state_to_modify)
2064 {
2065   struct {
2066     const char *name;
2067     GtkRegionFlags region_flag;
2068     GtkStateFlags state_flag;
2069   } pseudo_classes[] = {
2070     { "first-child",  GTK_REGION_FIRST, 0 },
2071     { "last-child",   GTK_REGION_LAST, 0 },
2072     { "only-child",   GTK_REGION_ONLY, 0 },
2073     { "sorted",       GTK_REGION_SORTED, 0 },
2074     { "active",       0, GTK_STATE_FLAG_ACTIVE },
2075     { "prelight",     0, GTK_STATE_FLAG_PRELIGHT },
2076     { "hover",        0, GTK_STATE_FLAG_PRELIGHT },
2077     { "selected",     0, GTK_STATE_FLAG_SELECTED },
2078     { "insensitive",  0, GTK_STATE_FLAG_INSENSITIVE },
2079     { "inconsistent", 0, GTK_STATE_FLAG_INCONSISTENT },
2080     { "focused",      0, GTK_STATE_FLAG_FOCUSED },
2081     { "focus",        0, GTK_STATE_FLAG_FOCUSED },
2082     { "backdrop",     0, GTK_STATE_FLAG_BACKDROP },
2083     { NULL, }
2084   }, nth_child_classes[] = {
2085     { "first",        GTK_REGION_FIRST, 0 },
2086     { "last",         GTK_REGION_LAST, 0 },
2087     { "even",         GTK_REGION_EVEN, 0 },
2088     { "odd",          GTK_REGION_ODD, 0 },
2089     { NULL, }
2090   }, *classes;
2091   guint i;
2092   char *name;
2093
2094   name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
2095   if (name == NULL)
2096     {
2097       gtk_css_provider_error_literal (scanner->provider,
2098                                       scanner,
2099                                       GTK_CSS_PROVIDER_ERROR,
2100                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2101                                       "Missing name of pseudo-class");
2102       return FALSE;
2103     }
2104
2105   if (_gtk_css_parser_try (scanner->parser, "(", TRUE))
2106     {
2107       char *function = name;
2108
2109       name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2110       if (!_gtk_css_parser_try (scanner->parser, ")", FALSE))
2111         {
2112           gtk_css_provider_error_literal (scanner->provider,
2113                                           scanner,
2114                                           GTK_CSS_PROVIDER_ERROR,
2115                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2116                                           "Missing closing bracket for pseudo-class");
2117           return FALSE;
2118         }
2119
2120       if (g_ascii_strcasecmp (function, "nth-child") != 0)
2121         {
2122           gtk_css_provider_error (scanner->provider,
2123                                   scanner,
2124                                   GTK_CSS_PROVIDER_ERROR,
2125                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2126                                   "Unknown pseudo-class '%s(%s)'", function, name ? name : "");
2127           g_free (function);
2128           g_free (name);
2129           return FALSE;
2130         }
2131
2132       g_free (function);
2133
2134       if (name == NULL)
2135         {
2136           gtk_css_provider_error (scanner->provider,
2137                                   scanner,
2138                                   GTK_CSS_PROVIDER_ERROR,
2139                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2140                                   "nth-child() requires an argument");
2141           return FALSE;
2142         }
2143
2144       classes = nth_child_classes;
2145     }
2146   else
2147     classes = pseudo_classes;
2148
2149   for (i = 0; classes[i].name != NULL; i++)
2150     {
2151       if (g_ascii_strcasecmp (name, classes[i].name) == 0)
2152         {
2153           if ((*region_to_modify & classes[i].region_flag) ||
2154               (*state_to_modify & classes[i].state_flag))
2155             {
2156               if (classes == nth_child_classes)
2157                 gtk_css_provider_error (scanner->provider,
2158                                         scanner,
2159                                         GTK_CSS_PROVIDER_ERROR,
2160                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
2161                                         "Duplicate pseudo-class 'nth-child(%s)'", name);
2162               else
2163                 gtk_css_provider_error (scanner->provider,
2164                                         scanner,
2165                                         GTK_CSS_PROVIDER_ERROR,
2166                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
2167                                         "Duplicate pseudo-class '%s'", name);
2168             }
2169           *region_to_modify |= classes[i].region_flag;
2170           *state_to_modify |= classes[i].state_flag;
2171
2172           g_free (name);
2173           return TRUE;
2174         }
2175     }
2176
2177   if (classes == nth_child_classes)
2178     gtk_css_provider_error (scanner->provider,
2179                             scanner,
2180                             GTK_CSS_PROVIDER_ERROR,
2181                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2182                             "Unknown pseudo-class 'nth-child(%s)'", name);
2183   else
2184     gtk_css_provider_error (scanner->provider,
2185                             scanner,
2186                             GTK_CSS_PROVIDER_ERROR,
2187                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2188                             "Unknown pseudo-class '%s'", name);
2189   g_free (name);
2190   return FALSE;
2191 }
2192
2193 static gboolean
2194 parse_simple_selector (GtkCssScanner *scanner,
2195                        char **name,
2196                        GArray *ids,
2197                        GArray *classes,
2198                        GtkRegionFlags *pseudo_classes,
2199                        GtkStateFlags *state)
2200 {
2201   gboolean parsed_something;
2202
2203   *name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
2204   if (*name)
2205     parsed_something = TRUE;
2206   else
2207     parsed_something = _gtk_css_parser_try (scanner->parser, "*", FALSE);
2208
2209   do {
2210       if (_gtk_css_parser_try (scanner->parser, "#", FALSE))
2211         {
2212           if (!parse_selector_name (scanner, ids))
2213             return FALSE;
2214         }
2215       else if (_gtk_css_parser_try (scanner->parser, ".", FALSE))
2216         {
2217           if (!parse_selector_class (scanner, classes))
2218             return FALSE;
2219         }
2220       else if (_gtk_css_parser_try (scanner->parser, ":", FALSE))
2221         {
2222           if (!parse_selector_pseudo_class (scanner, pseudo_classes, state))
2223             return FALSE;
2224         }
2225       else if (!parsed_something)
2226         {
2227           gtk_css_provider_error_literal (scanner->provider,
2228                                           scanner,
2229                                           GTK_CSS_PROVIDER_ERROR,
2230                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2231                                           "Expected a valid selector");
2232           return FALSE;
2233         }
2234       else
2235         break;
2236
2237       parsed_something = TRUE;
2238     }
2239   while (!_gtk_css_parser_is_eof (scanner->parser));
2240
2241   _gtk_css_parser_skip_whitespace (scanner->parser);
2242   return TRUE;
2243 }
2244
2245 static GtkCssSelector *
2246 parse_selector (GtkCssScanner *scanner)
2247 {
2248   GtkCssSelector *selector = NULL;
2249
2250   do {
2251       char *name = NULL;
2252       GArray *ids = g_array_new (TRUE, FALSE, sizeof (GQuark));
2253       GArray *classes = g_array_new (TRUE, FALSE, sizeof (GQuark));
2254       GtkRegionFlags pseudo_classes = 0;
2255       GtkStateFlags state = 0;
2256       GtkCssCombinator combine = GTK_CSS_COMBINE_DESCANDANT;
2257
2258       if (selector)
2259         {
2260           if (_gtk_css_parser_try (scanner->parser, ">", TRUE))
2261             combine = GTK_CSS_COMBINE_CHILD;
2262         }
2263
2264       if (!parse_simple_selector (scanner, &name, ids, classes, &pseudo_classes, &state))
2265         {
2266           g_array_free (ids, TRUE);
2267           g_array_free (classes, TRUE);
2268           if (selector)
2269             _gtk_css_selector_free (selector);
2270           return NULL;
2271         }
2272
2273       selector = _gtk_css_selector_new (selector,
2274                                         combine,
2275                                         name,
2276                                         (GQuark *) g_array_free (ids, ids->len == 0),
2277                                         (GQuark *) g_array_free (classes, classes->len == 0),
2278                                         pseudo_classes,
2279                                         state);
2280       g_free (name);
2281     }
2282   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2283          !_gtk_css_parser_begins_with (scanner->parser, ',') &&
2284          !_gtk_css_parser_begins_with (scanner->parser, '{'));
2285
2286   return selector;
2287 }
2288
2289 static GSList *
2290 parse_selector_list (GtkCssScanner *scanner)
2291 {
2292   GSList *selectors = NULL;
2293
2294   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_SELECTOR);
2295
2296   do {
2297       GtkCssSelector *select = parse_selector (scanner);
2298
2299       if (select == NULL)
2300         {
2301           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2302           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2303           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2304           return NULL;
2305         }
2306
2307       selectors = g_slist_prepend (selectors, select);
2308     }
2309   while (_gtk_css_parser_try (scanner->parser, ",", TRUE));
2310
2311   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2312
2313   return selectors;
2314 }
2315
2316 static void
2317 parse_declaration (GtkCssScanner *scanner,
2318                    GtkCssRuleset *ruleset)
2319 {
2320   GtkStyleProperty *property;
2321   char *name;
2322
2323   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DECLARATION);
2324
2325   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2326   if (name == NULL)
2327     goto check_for_semicolon;
2328
2329   property = _gtk_style_property_lookup (name);
2330   if (property == NULL && name[0] != '-')
2331     {
2332       gtk_css_provider_error (scanner->provider,
2333                               scanner,
2334                               GTK_CSS_PROVIDER_ERROR,
2335                               GTK_CSS_PROVIDER_ERROR_NAME,
2336                               "'%s' is not a valid property name",
2337                               name);
2338       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2339       g_free (name);
2340       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2341       return;
2342     }
2343
2344   if (!_gtk_css_parser_try (scanner->parser, ":", TRUE))
2345     {
2346       gtk_css_provider_invalid_token (scanner->provider, scanner, "':'");
2347       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2348       g_free (name);
2349       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2350       return;
2351     }
2352
2353   if (property)
2354     {
2355       PropertyValue *val;
2356
2357       g_free (name);
2358
2359       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2360
2361       val = property_value_new (scanner->section);
2362
2363       if (_gtk_style_property_parse_value (property,
2364                                            &val->value,
2365                                            scanner->parser,
2366                                            gtk_css_scanner_get_base_url (scanner)))
2367         {
2368           if (_gtk_css_parser_begins_with (scanner->parser, ';') ||
2369               _gtk_css_parser_begins_with (scanner->parser, '}') ||
2370               _gtk_css_parser_is_eof (scanner->parser))
2371             {
2372               gtk_css_ruleset_add (ruleset, property, val);
2373             }
2374           else
2375             {
2376               gtk_css_provider_error_literal (scanner->provider,
2377                                               scanner,
2378                                               GTK_CSS_PROVIDER_ERROR,
2379                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
2380                                               "Junk at end of value");
2381               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2382               property_value_free (val);
2383               gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2384               gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2385               return;
2386             }
2387         }
2388       else
2389         {
2390           property_value_free (val);
2391           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2392           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2393           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2394           return;
2395         }
2396       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2397     }
2398   else if (name[0] == '-')
2399     {
2400       char *value_str;
2401
2402       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2403
2404       value_str = _gtk_css_parser_read_value (scanner->parser);
2405       if (value_str)
2406         {
2407           PropertyValue *val;
2408
2409           val = property_value_new (scanner->section);
2410           g_value_init (&val->value, G_TYPE_STRING);
2411           g_value_take_string (&val->value, value_str);
2412
2413           gtk_css_ruleset_add_style (ruleset, name, val);
2414         }
2415       else
2416         {
2417           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2418           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2419           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2420           return;
2421         }
2422
2423       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2424     }
2425   else
2426     g_free (name);
2427
2428 check_for_semicolon:
2429   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2430
2431   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2432     {
2433       if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2434           !_gtk_css_parser_is_eof (scanner->parser))
2435         {
2436           gtk_css_provider_error_literal (scanner->provider,
2437                                           scanner,
2438                                           GTK_CSS_PROVIDER_ERROR,
2439                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2440                                           "Expected semicolon");
2441           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2442         }
2443     }
2444 }
2445
2446 static void
2447 parse_declarations (GtkCssScanner *scanner,
2448                     GtkCssRuleset *ruleset)
2449 {
2450   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2451          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2452     {
2453       parse_declaration (scanner, ruleset);
2454     }
2455 }
2456
2457 static void
2458 parse_ruleset (GtkCssScanner *scanner)
2459 {
2460   GSList *selectors;
2461   GtkCssRuleset ruleset = { 0, };
2462
2463   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_RULESET);
2464
2465   selectors = parse_selector_list (scanner);
2466   if (selectors == NULL)
2467     {
2468       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2469       return;
2470     }
2471
2472   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2473     {
2474       gtk_css_provider_error_literal (scanner->provider,
2475                                       scanner,
2476                                       GTK_CSS_PROVIDER_ERROR,
2477                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2478                                       "expected '{' after selectors");
2479       _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2480       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2481       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2482       return;
2483     }
2484
2485   parse_declarations (scanner, &ruleset);
2486
2487   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2488     {
2489       gtk_css_provider_error_literal (scanner->provider,
2490                                       scanner,
2491                                       GTK_CSS_PROVIDER_ERROR,
2492                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2493                                       "expected '}' after declarations");
2494       if (!_gtk_css_parser_is_eof (scanner->parser))
2495         {
2496           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2497           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2498           gtk_css_ruleset_clear (&ruleset);
2499           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2500         }
2501     }
2502
2503   css_provider_commit (scanner->provider, selectors, &ruleset);
2504   gtk_css_ruleset_clear (&ruleset);
2505   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2506 }
2507
2508 static void
2509 parse_statement (GtkCssScanner *scanner)
2510 {
2511   if (_gtk_css_parser_begins_with (scanner->parser, '@'))
2512     parse_at_keyword (scanner);
2513   else
2514     parse_ruleset (scanner);
2515 }
2516
2517 static void
2518 parse_stylesheet (GtkCssScanner *scanner)
2519 {
2520   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2521
2522   _gtk_css_parser_skip_whitespace (scanner->parser);
2523
2524   while (!_gtk_css_parser_is_eof (scanner->parser))
2525     {
2526       if (_gtk_css_parser_try (scanner->parser, "<!--", TRUE) ||
2527           _gtk_css_parser_try (scanner->parser, "-->", TRUE))
2528         continue;
2529
2530       parse_statement (scanner);
2531     }
2532
2533   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2534 }
2535
2536 static int
2537 gtk_css_provider_compare_rule (gconstpointer a_,
2538                                gconstpointer b_)
2539 {
2540   const GtkCssRuleset *a = (const GtkCssRuleset *) a_;
2541   const GtkCssRuleset *b = (const GtkCssRuleset *) b_;
2542   int compare;
2543
2544   compare = _gtk_css_selector_compare (a->selector, b->selector);
2545   if (compare != 0)
2546     return compare;
2547
2548   /* compare pointers in array to ensure a stable sort */
2549   if (a_ < b_)
2550     return -1;
2551
2552   if (a_ > b_)
2553     return 1;
2554
2555   return 0;
2556 }
2557
2558 static void
2559 gtk_css_provider_postprocess (GtkCssProvider *css_provider)
2560 {
2561   GtkCssProviderPrivate *priv = css_provider->priv;
2562
2563   g_array_sort (priv->rulesets, gtk_css_provider_compare_rule);
2564 }
2565
2566 static gboolean
2567 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
2568                                 GtkCssScanner  *parent,
2569                                 GFile          *file,
2570                                 const char     *text,
2571                                 GError        **error)
2572 {
2573   GtkCssScanner *scanner;
2574   gulong error_handler;
2575   char *free_data = NULL;
2576
2577   if (error)
2578     error_handler = g_signal_connect (css_provider,
2579                                       "parsing-error",
2580                                       G_CALLBACK (gtk_css_provider_propagate_error),
2581                                       error);
2582   else
2583     error_handler = 0; /* silence gcc */
2584
2585   if (text == NULL)
2586     {
2587       GError *load_error = NULL;
2588
2589       if (g_file_load_contents (file, NULL,
2590                                 &free_data, NULL,
2591                                 NULL, &load_error))
2592         {
2593           text = free_data;
2594         }
2595       else
2596         {
2597           GtkCssSection *section;
2598
2599           if (parent)
2600             section = gtk_css_section_ref (parent->section);
2601           else
2602             section = _gtk_css_section_new_for_file (GTK_CSS_SECTION_DOCUMENT, file);
2603
2604           gtk_css_provider_error (css_provider,
2605                                   parent,
2606                                   GTK_CSS_PROVIDER_ERROR,
2607                                   GTK_CSS_PROVIDER_ERROR_IMPORT,
2608                                   "Failed to import: %s",
2609                                   load_error->message);
2610
2611           gtk_css_section_unref (section);
2612         }
2613     }
2614
2615   if (text)
2616     {
2617       scanner = gtk_css_scanner_new (css_provider,
2618                                      parent,
2619                                      parent ? parent->section : NULL,
2620                                      file,
2621                                      text);
2622
2623       parse_stylesheet (scanner);
2624
2625       gtk_css_scanner_destroy (scanner);
2626
2627       if (parent == NULL)
2628         gtk_css_provider_postprocess (css_provider);
2629     }
2630
2631   g_free (free_data);
2632
2633   if (error)
2634     {
2635       g_signal_handler_disconnect (css_provider, error_handler);
2636
2637       if (*error)
2638         {
2639           /* We clear all contents from the provider for backwards compat reasons */
2640           gtk_css_provider_reset (css_provider);
2641           return FALSE;
2642         }
2643     }
2644
2645   return TRUE;
2646 }
2647
2648 /**
2649  * gtk_css_provider_load_from_data:
2650  * @css_provider: a #GtkCssProvider
2651  * @data: (array length=length) (element-type guint8): CSS data loaded in memory
2652  * @length: the length of @data in bytes, or -1 for NUL terminated strings. If
2653  *   @length is not -1, the code will assume it is not NUL terminated and will
2654  *   potentially do a copy.
2655  * @error: (out) (allow-none): return location for a #GError, or %NULL
2656  *
2657  * Loads @data into @css_provider, making it clear any previously loaded
2658  * information.
2659  *
2660  * Returns: %TRUE if the data could be loaded.
2661  **/
2662 gboolean
2663 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2664                                  const gchar     *data,
2665                                  gssize           length,
2666                                  GError         **error)
2667 {
2668   char *free_data;
2669   gboolean ret;
2670
2671   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2672   g_return_val_if_fail (data != NULL, FALSE);
2673
2674   if (length < 0)
2675     {
2676       length = strlen (data);
2677       free_data = NULL;
2678     }
2679   else
2680     {
2681       free_data = g_strndup (data, length);
2682       data = free_data;
2683     }
2684
2685   gtk_css_provider_reset (css_provider);
2686
2687   ret = gtk_css_provider_load_internal (css_provider, NULL, NULL, data, error);
2688
2689   g_free (free_data);
2690
2691   return ret;
2692 }
2693
2694 /**
2695  * gtk_css_provider_load_from_file:
2696  * @css_provider: a #GtkCssProvider
2697  * @file: #GFile pointing to a file to load
2698  * @error: (out) (allow-none): return location for a #GError, or %NULL
2699  *
2700  * Loads the data contained in @file into @css_provider, making it
2701  * clear any previously loaded information.
2702  *
2703  * Returns: %TRUE if the data could be loaded.
2704  **/
2705 gboolean
2706 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2707                                  GFile           *file,
2708                                  GError         **error)
2709 {
2710   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2711   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2712
2713   gtk_css_provider_reset (css_provider);
2714
2715   return gtk_css_provider_load_internal (css_provider, NULL, file, NULL, error);
2716 }
2717
2718 /**
2719  * gtk_css_provider_load_from_path:
2720  * @css_provider: a #GtkCssProvider
2721  * @path: the path of a filename to load, in the GLib filename encoding
2722  * @error: (out) (allow-none): return location for a #GError, or %NULL
2723  *
2724  * Loads the data contained in @path into @css_provider, making it clear
2725  * any previously loaded information.
2726  *
2727  * Returns: %TRUE if the data could be loaded.
2728  **/
2729 gboolean
2730 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2731                                  const gchar     *path,
2732                                  GError         **error)
2733 {
2734   GFile *file;
2735   gboolean result;
2736
2737   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2738   g_return_val_if_fail (path != NULL, FALSE);
2739
2740   file = g_file_new_for_path (path);
2741
2742   result = gtk_css_provider_load_from_file (css_provider, file, error);
2743
2744   g_object_unref (file);
2745
2746   return result;
2747 }
2748
2749 static gboolean
2750 _gtk_css_provider_load_from_resource (GtkCssProvider  *css_provider,
2751                                       const gchar     *resource_path)
2752 {
2753   GFile *file;
2754   char *uri, *escaped;
2755   gboolean result;
2756
2757   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2758   g_return_val_if_fail (resource_path != NULL, FALSE);
2759
2760   escaped = g_uri_escape_string (resource_path,
2761                                  G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, FALSE);
2762   uri = g_strconcat ("resource://", escaped, NULL);
2763   g_free (escaped);
2764
2765   file = g_file_new_for_uri (uri);
2766   g_free (uri);
2767
2768   result = gtk_css_provider_load_from_file (css_provider, file, NULL);
2769
2770   g_object_unref (file);
2771
2772   return result;
2773 }
2774
2775 /**
2776  * gtk_css_provider_get_default:
2777  *
2778  * Returns the provider containing the style settings used as a
2779  * fallback for all widgets.
2780  *
2781  * Returns: (transfer none): The provider used for fallback styling.
2782  *          This memory is owned by GTK+, and you must not free it.
2783  **/
2784 GtkCssProvider *
2785 gtk_css_provider_get_default (void)
2786 {
2787   static GtkCssProvider *provider;
2788
2789   if (G_UNLIKELY (!provider))
2790     {
2791
2792       provider = gtk_css_provider_new ();
2793       if (!_gtk_css_provider_load_from_resource (provider, "/org/gtk/libgtk/gtk-default.css"))
2794         {
2795           g_error ("Failed to load the internal default CSS.");
2796         }
2797     }
2798
2799   return provider;
2800 }
2801
2802 gchar *
2803 _gtk_css_provider_get_theme_dir (void)
2804 {
2805   const gchar *var;
2806   gchar *path;
2807
2808   var = g_getenv ("GTK_DATA_PREFIX");
2809
2810   if (var)
2811     path = g_build_filename (var, "share", "themes", NULL);
2812   else
2813     path = g_build_filename (_gtk_get_data_prefix (), "share", "themes", NULL);
2814
2815   return path;
2816 }
2817
2818 /**
2819  * gtk_css_provider_get_named:
2820  * @name: A theme name
2821  * @variant: (allow-none): variant to load, for example, "dark", or
2822  *     %NULL for the default
2823  *
2824  * Loads a theme from the usual theme paths
2825  *
2826  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
2827  *     This memory is owned by GTK+, and you must not free it.
2828  */
2829 GtkCssProvider *
2830 gtk_css_provider_get_named (const gchar *name,
2831                             const gchar *variant)
2832 {
2833   static GHashTable *themes = NULL;
2834   GtkCssProvider *provider;
2835   gchar *key;
2836
2837   if (G_UNLIKELY (!themes))
2838     {
2839       themes = g_hash_table_new (g_str_hash, g_str_equal);
2840
2841       provider = gtk_css_provider_new ();
2842       if (!_gtk_css_provider_load_from_resource (provider, "/org/gtk/libgtk/gtk-win32.css"))
2843         {
2844           g_warning ("Failed to load the internal win32 default CSS.");
2845           g_object_unref (provider);
2846         }
2847       else
2848         g_hash_table_insert (themes, "gtk-win32", provider);
2849     }
2850
2851   if (variant == NULL)
2852     key = (gchar *)name;
2853   else
2854     key = g_strconcat (name, "-", variant, NULL);
2855
2856   provider = g_hash_table_lookup (themes, key);
2857
2858   if (!provider)
2859     {
2860       const gchar *home_dir;
2861       gchar *subpath, *path = NULL;
2862
2863       if (variant)
2864         subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
2865       else
2866         subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
2867
2868       /* First look in the users home directory
2869        */
2870       home_dir = g_get_home_dir ();
2871       if (home_dir)
2872         {
2873           path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
2874
2875           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2876             {
2877               g_free (path);
2878               path = NULL;
2879             }
2880         }
2881
2882       if (!path)
2883         {
2884           gchar *theme_dir;
2885
2886           theme_dir = _gtk_css_provider_get_theme_dir ();
2887           path = g_build_filename (theme_dir, name, subpath, NULL);
2888           g_free (theme_dir);
2889
2890           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2891             {
2892               g_free (path);
2893               path = NULL;
2894             }
2895         }
2896
2897       g_free (subpath);
2898
2899       if (path)
2900         {
2901           provider = gtk_css_provider_new ();
2902
2903           if (!gtk_css_provider_load_from_path (provider, path, NULL))
2904             {
2905               g_object_unref (provider);
2906               provider = NULL;
2907             }
2908           else
2909             g_hash_table_insert (themes, g_strdup (key), provider);
2910
2911           g_free (path);
2912         }
2913     }
2914
2915   if (key != name)
2916     g_free (key);
2917
2918   return provider;
2919 }
2920
2921 static int
2922 compare_properties (gconstpointer a, gconstpointer b)
2923 {
2924   return strcmp (_gtk_style_property_get_name ((GtkStyleProperty *) a),
2925                  _gtk_style_property_get_name ((GtkStyleProperty *) b));
2926 }
2927
2928 static void
2929 gtk_css_ruleset_print (const GtkCssRuleset *ruleset,
2930                        GString             *str)
2931 {
2932   GList *keys, *walk;
2933
2934   _gtk_css_selector_print (ruleset->selector, str);
2935
2936   g_string_append (str, " {\n");
2937
2938   if (ruleset->style)
2939     {
2940       keys = g_hash_table_get_keys (ruleset->style);
2941       /* so the output is identical for identical selector styles */
2942       keys = g_list_sort (keys, compare_properties);
2943
2944       for (walk = keys; walk; walk = walk->next)
2945         {
2946           GtkCssStyleProperty *prop = walk->data;
2947           const PropertyValue *value = g_hash_table_lookup (ruleset->style, prop);
2948
2949           g_string_append (str, "  ");
2950           g_string_append (str, _gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop)));
2951           g_string_append (str, ": ");
2952           _gtk_css_style_property_print_value (prop, &value->value, str);
2953           g_string_append (str, ";\n");
2954         }
2955
2956       g_list_free (keys);
2957     }
2958
2959   if (ruleset->widget_style)
2960     {
2961       keys = g_hash_table_get_keys (ruleset->widget_style);
2962       /* so the output is identical for identical selector styles */
2963       keys = g_list_sort (keys, (GCompareFunc) strcmp);
2964
2965       for (walk = keys; walk; walk = walk->next)
2966         {
2967           const char *name = walk->data;
2968           const PropertyValue *value = g_hash_table_lookup (ruleset->widget_style, (gpointer) name);
2969
2970           g_string_append (str, "  ");
2971           g_string_append (str, name);
2972           g_string_append (str, ": ");
2973           g_string_append (str, g_value_get_string (&value->value));
2974           g_string_append (str, ";\n");
2975         }
2976
2977       g_list_free (keys);
2978     }
2979
2980   g_string_append (str, "}\n");
2981 }
2982
2983 static void
2984 gtk_css_provider_print_colors (GHashTable *colors,
2985                                GString    *str)
2986 {
2987   GList *keys, *walk;
2988   char *s;
2989
2990   keys = g_hash_table_get_keys (colors);
2991   /* so the output is identical for identical styles */
2992   keys = g_list_sort (keys, (GCompareFunc) strcmp);
2993
2994   for (walk = keys; walk; walk = walk->next)
2995     {
2996       const char *name = walk->data;
2997       GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
2998
2999       g_string_append (str, "@define-color ");
3000       g_string_append (str, name);
3001       g_string_append (str, " ");
3002       s = gtk_symbolic_color_to_string (symbolic);
3003       g_string_append (str, s);
3004       g_free (s);
3005       g_string_append (str, ";\n");
3006     }
3007
3008   g_list_free (keys);
3009 }
3010
3011 /**
3012  * gtk_css_provider_to_string:
3013  * @provider: the provider to write to a string
3014  *
3015  * Convertes the @provider into a string representation in CSS
3016  * format.
3017  *
3018  * Using gtk_css_provider_load_from_data() with the return value
3019  * from this function on a new provider created with
3020  * gtk_css_provider_new() will basicallu create a duplicate of
3021  * this @provider.
3022  *
3023  * Returns: a new string representing the @provider.
3024  *
3025  * Since: 3.2
3026  **/
3027 char *
3028 gtk_css_provider_to_string (GtkCssProvider *provider)
3029 {
3030   GtkCssProviderPrivate *priv;
3031   GString *str;
3032   guint i;
3033
3034   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
3035
3036   priv = provider->priv;
3037
3038   str = g_string_new ("");
3039
3040   gtk_css_provider_print_colors (priv->symbolic_colors, str);
3041
3042   for (i = 0; i < priv->rulesets->len; i++)
3043     {
3044       if (i > 0)
3045         g_string_append (str, "\n");
3046       gtk_css_ruleset_print (&g_array_index (priv->rulesets, GtkCssRuleset, i), str);
3047     }
3048
3049   return g_string_free (str, FALSE);
3050 }
3051