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       GArray *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           const GValue *sub = &g_array_index (array, GValue, i);
1204           PropertyValue *val;
1205
1206           val = property_value_new (value->section);
1207           g_value_init (&val->value, G_VALUE_TYPE (sub));
1208           g_value_copy (sub, &val->value);
1209           gtk_css_ruleset_add (ruleset, GTK_STYLE_PROPERTY (child), val);
1210         }
1211       property_value_free (value);
1212     }
1213   else if (GTK_IS_CSS_STYLE_PROPERTY (prop))
1214     {
1215       g_return_if_fail (_gtk_css_style_property_is_specified_type (GTK_CSS_STYLE_PROPERTY (prop),
1216                                                                    G_VALUE_TYPE (&value->value)));
1217
1218       _gtk_bitmask_set (ruleset->set_styles,
1219                         _gtk_css_style_property_get_id (GTK_CSS_STYLE_PROPERTY (prop)),
1220                         TRUE);
1221       g_hash_table_insert (ruleset->style, prop, value);
1222     }
1223   else
1224     {
1225       g_assert_not_reached ();
1226     }
1227 }
1228
1229 static gboolean
1230 gtk_css_ruleset_matches (GtkCssRuleset *ruleset,
1231                          GtkWidgetPath *path,
1232                          GtkStateFlags  state)
1233 {
1234   return _gtk_css_selector_matches (ruleset->selector, path, state);
1235 }
1236
1237 static void
1238 gtk_css_scanner_destroy (GtkCssScanner *scanner)
1239 {
1240   if (scanner->section)
1241     gtk_css_section_unref (scanner->section);
1242   g_object_unref (scanner->provider);
1243   if (scanner->file)
1244     g_object_unref (scanner->file);
1245   g_object_unref (scanner->base);
1246   _gtk_css_parser_free (scanner->parser);
1247
1248   g_slice_free (GtkCssScanner, scanner);
1249 }
1250
1251 static void
1252 gtk_css_provider_emit_error (GtkCssProvider *provider,
1253                              GtkCssScanner  *scanner,
1254                              const GError   *error)
1255 {
1256   g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
1257                  scanner != NULL ? scanner->section : NULL, error);
1258 }
1259
1260 static void
1261 gtk_css_scanner_parser_error (GtkCssParser *parser,
1262                               const GError *error,
1263                               gpointer      user_data)
1264 {
1265   GtkCssScanner *scanner = user_data;
1266
1267   gtk_css_provider_emit_error (scanner->provider,
1268                                scanner,
1269                                error);
1270 }
1271
1272 static GtkCssScanner *
1273 gtk_css_scanner_new (GtkCssProvider *provider,
1274                      GtkCssScanner  *parent,
1275                      GtkCssSection  *section,
1276                      GFile          *file,
1277                      const gchar    *text)
1278 {
1279   GtkCssScanner *scanner;
1280
1281   scanner = g_slice_new0 (GtkCssScanner);
1282
1283   g_object_ref (provider);
1284   scanner->provider = provider;
1285   scanner->parent = parent;
1286   if (section)
1287     scanner->section = gtk_css_section_ref (section);
1288
1289   if (file)
1290     {
1291       scanner->file = g_object_ref (file);
1292       scanner->base = g_file_get_parent (file);
1293     }
1294   else
1295     {
1296       char *dir = g_get_current_dir ();
1297       scanner->base = g_file_new_for_path (dir);
1298       g_free (dir);
1299     }
1300
1301   scanner->parser = _gtk_css_parser_new (text,
1302                                          gtk_css_scanner_parser_error,
1303                                          scanner);
1304
1305   return scanner;
1306 }
1307
1308 static GFile *
1309 gtk_css_scanner_get_base_url (GtkCssScanner *scanner)
1310 {
1311   return scanner->base;
1312 }
1313
1314 static gboolean
1315 gtk_css_scanner_would_recurse (GtkCssScanner *scanner,
1316                                GFile         *file)
1317 {
1318   while (scanner)
1319     {
1320       if (scanner->file && g_file_equal (scanner->file, file))
1321         return TRUE;
1322
1323       scanner = scanner->parent;
1324     }
1325
1326   return FALSE;
1327 }
1328
1329 static void
1330 gtk_css_scanner_push_section (GtkCssScanner     *scanner,
1331                               GtkCssSectionType  section_type)
1332 {
1333   GtkCssSection *section;
1334
1335   section = _gtk_css_section_new (scanner->section,
1336                                   section_type,
1337                                   scanner->parser,
1338                                   scanner->file);
1339
1340   if (scanner->section)
1341     gtk_css_section_unref (scanner->section);
1342   scanner->section = section;
1343 }
1344
1345 static void
1346 gtk_css_scanner_pop_section (GtkCssScanner *scanner,
1347                              GtkCssSectionType check_type)
1348 {
1349   GtkCssSection *parent;
1350
1351   g_assert (gtk_css_section_get_section_type (scanner->section) == check_type);
1352
1353   parent = gtk_css_section_get_parent (scanner->section);
1354   if (parent)
1355     gtk_css_section_ref (parent);
1356
1357   _gtk_css_section_end (scanner->section);
1358   gtk_css_section_unref (scanner->section);
1359
1360   scanner->section = parent;
1361 }
1362
1363 static void
1364 gtk_css_provider_init (GtkCssProvider *css_provider)
1365 {
1366   GtkCssProviderPrivate *priv;
1367
1368   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1369                                                            GTK_TYPE_CSS_PROVIDER,
1370                                                            GtkCssProviderPrivate);
1371
1372   priv->rulesets = g_array_new (FALSE, FALSE, sizeof (GtkCssRuleset));
1373
1374   priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
1375                                                  (GDestroyNotify) g_free,
1376                                                  (GDestroyNotify) gtk_symbolic_color_unref);
1377 }
1378
1379 static void
1380 css_provider_dump_symbolic_colors (GtkCssProvider     *css_provider,
1381                                    GtkStyleProperties *props)
1382 {
1383   GtkCssProviderPrivate *priv;
1384   GHashTableIter iter;
1385   gpointer key, value;
1386
1387   priv = css_provider->priv;
1388   g_hash_table_iter_init (&iter, priv->symbolic_colors);
1389
1390   while (g_hash_table_iter_next (&iter, &key, &value))
1391     {
1392       const gchar *name;
1393       GtkSymbolicColor *color;
1394
1395       name = key;
1396       color = value;
1397
1398       gtk_style_properties_map_color (props, name, color);
1399     }
1400 }
1401
1402 static GtkStyleProperties *
1403 gtk_css_provider_get_style (GtkStyleProvider *provider,
1404                             GtkWidgetPath    *path)
1405 {
1406   GtkCssProvider *css_provider;
1407   GtkCssProviderPrivate *priv;
1408   GtkStyleProperties *props;
1409   guint i;
1410
1411   css_provider = GTK_CSS_PROVIDER (provider);
1412   priv = css_provider->priv;
1413   props = gtk_style_properties_new ();
1414
1415   css_provider_dump_symbolic_colors (css_provider, props);
1416
1417   for (i = 0; i < priv->rulesets->len; i++)
1418     {
1419       GtkCssRuleset *ruleset;
1420       GHashTableIter iter;
1421       gpointer key, val;
1422
1423       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1424
1425       if (ruleset->style == NULL)
1426         continue;
1427
1428       if (!gtk_css_ruleset_matches (ruleset, path, 0))
1429         continue;
1430
1431       g_hash_table_iter_init (&iter, ruleset->style);
1432
1433       while (g_hash_table_iter_next (&iter, &key, &val))
1434         {
1435           GtkCssStyleProperty *prop = key;
1436           PropertyValue *value = val;
1437
1438           _gtk_style_properties_set_property_by_property (props,
1439                                                           prop,
1440                                                           _gtk_css_selector_get_state_flags (ruleset->selector),
1441                                                           &value->value);
1442         }
1443     }
1444
1445   return props;
1446 }
1447
1448 static gboolean
1449 gtk_css_provider_get_style_property (GtkStyleProvider *provider,
1450                                      GtkWidgetPath    *path,
1451                                      GtkStateFlags     state,
1452                                      GParamSpec       *pspec,
1453                                      GValue           *value)
1454 {
1455   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1456   GtkCssProviderPrivate *priv = css_provider->priv;
1457   PropertyValue *val;
1458   gboolean found = FALSE;
1459   gchar *prop_name;
1460   gint i;
1461
1462   prop_name = g_strdup_printf ("-%s-%s",
1463                                g_type_name (pspec->owner_type),
1464                                pspec->name);
1465
1466   for (i = priv->rulesets->len - 1; i >= 0; i--)
1467     {
1468       GtkCssRuleset *ruleset;
1469
1470       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1471
1472       if (ruleset->widget_style == NULL)
1473         continue;
1474
1475       if (!gtk_css_ruleset_matches (ruleset, path, state))
1476         continue;
1477
1478       val = g_hash_table_lookup (ruleset->widget_style, prop_name);
1479
1480       if (val)
1481         {
1482           GtkCssScanner *scanner;
1483
1484           scanner = gtk_css_scanner_new (css_provider,
1485                                          NULL,
1486                                          val->section,
1487                                          gtk_css_section_get_file (val->section),
1488                                          g_value_get_string (&val->value));
1489
1490           found = _gtk_css_style_parse_value (value,
1491                                               scanner->parser,
1492                                               NULL);
1493
1494           gtk_css_scanner_destroy (scanner);
1495
1496           if (found)
1497             break;
1498         }
1499     }
1500
1501   g_free (prop_name);
1502
1503   return found;
1504 }
1505
1506 static void
1507 gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
1508 {
1509   iface->get_style = gtk_css_provider_get_style;
1510   iface->get_style_property = gtk_css_provider_get_style_property;
1511 }
1512
1513 static GtkSymbolicColor *
1514 gtk_css_style_provider_get_color (GtkStyleProviderPrivate *provider,
1515                                   const char              *name)
1516 {
1517   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1518
1519   return g_hash_table_lookup (css_provider->priv->symbolic_colors, name);
1520 }
1521
1522 static void
1523 gtk_css_style_provider_lookup (GtkStyleProviderPrivate *provider,
1524                                GtkWidgetPath           *path,
1525                                GtkStateFlags            state,
1526                                GtkCssLookup            *lookup)
1527 {
1528   GtkCssProvider *css_provider;
1529   GtkCssProviderPrivate *priv;
1530   int i;
1531
1532   css_provider = GTK_CSS_PROVIDER (provider);
1533   priv = css_provider->priv;
1534
1535   for (i = priv->rulesets->len - 1; i >= 0; i--)
1536     {
1537       GtkCssRuleset *ruleset;
1538       GHashTableIter iter;
1539       gpointer key, val;
1540
1541       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1542
1543       if (ruleset->style == NULL)
1544         continue;
1545
1546       if (!_gtk_bitmask_intersects (_gtk_css_lookup_get_missing (lookup),
1547                                     ruleset->set_styles))
1548         continue;
1549
1550       if (!gtk_css_ruleset_matches (ruleset, path, state))
1551         continue;
1552
1553       g_hash_table_iter_init (&iter, ruleset->style);
1554
1555       while (g_hash_table_iter_next (&iter, &key, &val))
1556         {
1557           GtkCssStyleProperty *prop = key;
1558           PropertyValue *value = val;
1559           guint id = _gtk_css_style_property_get_id (prop);
1560
1561           if (!_gtk_css_lookup_is_missing (lookup, id))
1562             continue;
1563
1564           _gtk_css_lookup_set (lookup, id, value->section, &value->value);
1565         }
1566     }
1567 }
1568
1569 static void
1570 gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface)
1571 {
1572   iface->get_color = gtk_css_style_provider_get_color;
1573   iface->lookup = gtk_css_style_provider_lookup;
1574 }
1575
1576 static void
1577 gtk_css_provider_finalize (GObject *object)
1578 {
1579   GtkCssProvider *css_provider;
1580   GtkCssProviderPrivate *priv;
1581   guint i;
1582
1583   css_provider = GTK_CSS_PROVIDER (object);
1584   priv = css_provider->priv;
1585
1586   for (i = 0; i < priv->rulesets->len; i++)
1587     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1588
1589   g_array_free (priv->rulesets, TRUE);
1590
1591   if (priv->symbolic_colors)
1592     g_hash_table_destroy (priv->symbolic_colors);
1593
1594   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1595 }
1596
1597 /**
1598  * gtk_css_provider_new:
1599  *
1600  * Returns a newly created #GtkCssProvider.
1601  *
1602  * Returns: A new #GtkCssProvider
1603  **/
1604 GtkCssProvider *
1605 gtk_css_provider_new (void)
1606 {
1607   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1608 }
1609
1610 static void
1611 gtk_css_provider_take_error (GtkCssProvider *provider,
1612                              GtkCssScanner  *scanner,
1613                              GError         *error)
1614 {
1615   gtk_css_provider_emit_error (provider,
1616                                scanner,
1617                                error);
1618
1619   g_error_free (error);
1620 }
1621
1622 static void
1623 gtk_css_provider_error_literal (GtkCssProvider *provider,
1624                                 GtkCssScanner  *scanner,
1625                                 GQuark          domain,
1626                                 gint            code,
1627                                 const char     *message)
1628 {
1629   gtk_css_provider_take_error (provider,
1630                                scanner,
1631                                g_error_new_literal (domain, code, message));
1632 }
1633
1634 static void
1635 gtk_css_provider_error (GtkCssProvider *provider,
1636                         GtkCssScanner  *scanner,
1637                         GQuark          domain,
1638                         gint            code,
1639                         const char     *format,
1640                         ...)  G_GNUC_PRINTF (5, 6);
1641 static void
1642 gtk_css_provider_error (GtkCssProvider *provider,
1643                         GtkCssScanner  *scanner,
1644                         GQuark          domain,
1645                         gint            code,
1646                         const char     *format,
1647                         ...)
1648 {
1649   GError *error;
1650   va_list args;
1651
1652   va_start (args, format);
1653   error = g_error_new_valist (domain, code, format, args);
1654   va_end (args);
1655
1656   gtk_css_provider_take_error (provider, scanner, error);
1657 }
1658
1659 static void
1660 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1661                                 GtkCssScanner  *scanner,
1662                                 const char     *expected)
1663 {
1664   gtk_css_provider_error (provider,
1665                           scanner,
1666                           GTK_CSS_PROVIDER_ERROR,
1667                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1668                           "expected a valid %s", expected);
1669 }
1670
1671 static void
1672 css_provider_commit (GtkCssProvider *css_provider,
1673                      GSList         *selectors,
1674                      GtkCssRuleset  *ruleset)
1675 {
1676   GtkCssProviderPrivate *priv;
1677   GSList *l;
1678
1679   priv = css_provider->priv;
1680
1681   if (ruleset->style == NULL && ruleset->widget_style == NULL)
1682     {
1683       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
1684       return;
1685     }
1686
1687   for (l = selectors; l; l = l->next)
1688     {
1689       GtkCssRuleset new;
1690
1691       gtk_css_ruleset_init_copy (&new, ruleset, l->data);
1692
1693       g_array_append_val (priv->rulesets, new);
1694     }
1695
1696   g_slist_free (selectors);
1697 }
1698
1699 static void
1700 gtk_css_provider_reset (GtkCssProvider *css_provider)
1701 {
1702   GtkCssProviderPrivate *priv;
1703   guint i;
1704
1705   priv = css_provider->priv;
1706
1707   g_hash_table_remove_all (priv->symbolic_colors);
1708
1709   for (i = 0; i < priv->rulesets->len; i++)
1710     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1711   g_array_set_size (priv->rulesets, 0);
1712 }
1713
1714 static void
1715 gtk_css_provider_propagate_error (GtkCssProvider  *provider,
1716                                   GtkCssSection   *section,
1717                                   const GError    *error,
1718                                   GError         **propagate_to)
1719 {
1720
1721   GFileInfo *info;
1722   GFile *file;
1723   const char *path;
1724
1725   file = gtk_css_section_get_file (section);
1726   if (file)
1727     {
1728       info = g_file_query_info (file,G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1729
1730       if (info)
1731         path = g_file_info_get_display_name (info);
1732       else
1733         path = "<broken file>";
1734     }
1735   else
1736     {
1737       info = NULL;
1738       path = "<unknown>";
1739     }
1740
1741   /* don't fail for deprecations */
1742   if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
1743     {
1744       g_warning ("Theme parsing error: %s:%u:%u: %s", path,
1745                  gtk_css_section_get_end_line (section) + 1,
1746                  gtk_css_section_get_end_position (section), error->message);
1747       return;
1748     }
1749
1750   /* we already set an error. And we'd like to keep the first one */
1751   if (*propagate_to)
1752     return;
1753
1754   *propagate_to = g_error_copy (error);
1755   g_prefix_error (propagate_to, "%s:%u:%u: ", path,
1756                   gtk_css_section_get_end_line (section) + 1,
1757                   gtk_css_section_get_end_position (section));
1758
1759   if (info)
1760     g_object_unref (info);
1761 }
1762
1763 static gboolean
1764 parse_import (GtkCssScanner *scanner)
1765 {
1766   GFile *file;
1767
1768   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_IMPORT);
1769
1770   if (!_gtk_css_parser_try (scanner->parser, "@import", TRUE))
1771     {
1772       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1773       return FALSE;
1774     }
1775
1776   if (_gtk_css_parser_is_string (scanner->parser))
1777     {
1778       char *uri;
1779
1780       uri = _gtk_css_parser_read_string (scanner->parser);
1781       file = g_file_resolve_relative_path (gtk_css_scanner_get_base_url (scanner), uri);
1782       g_free (uri);
1783     }
1784   else
1785     {
1786       file = _gtk_css_parser_read_url (scanner->parser,
1787                                        gtk_css_scanner_get_base_url (scanner));
1788     }
1789
1790   if (file == NULL)
1791     {
1792       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1793       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1794       return TRUE;
1795     }
1796
1797   if (!_gtk_css_parser_try (scanner->parser, ";", FALSE))
1798     {
1799       gtk_css_provider_invalid_token (scanner->provider, scanner, "semicolon");
1800       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1801     }
1802   else if (gtk_css_scanner_would_recurse (scanner, file))
1803     {
1804        char *path = g_file_get_path (file);
1805        gtk_css_provider_error (scanner->provider,
1806                                scanner,
1807                                GTK_CSS_PROVIDER_ERROR,
1808                                GTK_CSS_PROVIDER_ERROR_IMPORT,
1809                                "Loading '%s' would recurse",
1810                                path);
1811        g_free (path);
1812     }
1813   else
1814     {
1815       gtk_css_provider_load_internal (scanner->provider,
1816                                       scanner,
1817                                       file,
1818                                       NULL,
1819                                       NULL);
1820     }
1821
1822   g_object_unref (file);
1823
1824   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1825   _gtk_css_parser_skip_whitespace (scanner->parser);
1826
1827   return TRUE;
1828 }
1829
1830 static gboolean
1831 parse_color_definition (GtkCssScanner *scanner)
1832 {
1833   GtkSymbolicColor *symbolic;
1834   char *name;
1835
1836   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1837
1838   if (!_gtk_css_parser_try (scanner->parser, "@define-color", TRUE))
1839     {
1840       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1841       return FALSE;
1842     }
1843
1844   name = _gtk_css_parser_try_name (scanner->parser, TRUE);
1845   if (name == NULL)
1846     {
1847       gtk_css_provider_error_literal (scanner->provider,
1848                                       scanner,
1849                                       GTK_CSS_PROVIDER_ERROR,
1850                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1851                                       "Not a valid color name");
1852       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1853       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1854       return TRUE;
1855     }
1856
1857   symbolic = _gtk_css_parser_read_symbolic_color (scanner->parser);
1858   if (symbolic == NULL)
1859     {
1860       g_free (name);
1861       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1862       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1863       return TRUE;
1864     }
1865
1866   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1867     {
1868       g_free (name);
1869       gtk_symbolic_color_unref (symbolic);
1870       gtk_css_provider_error_literal (scanner->provider,
1871                                       scanner,
1872                                       GTK_CSS_PROVIDER_ERROR,
1873                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1874                                       "Missing semicolon at end of color definition");
1875       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1876
1877       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1878       return TRUE;
1879     }
1880
1881   g_hash_table_insert (scanner->provider->priv->symbolic_colors, name, symbolic);
1882
1883   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1884   return TRUE;
1885 }
1886
1887 static gboolean
1888 parse_binding_set (GtkCssScanner *scanner)
1889 {
1890   GtkBindingSet *binding_set;
1891   char *name;
1892
1893   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1894
1895   if (!_gtk_css_parser_try (scanner->parser, "@binding-set", TRUE))
1896     {
1897       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1898       return FALSE;
1899     }
1900
1901   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1902   if (name == NULL)
1903     {
1904       gtk_css_provider_error_literal (scanner->provider,
1905                                       scanner,
1906                                       GTK_CSS_PROVIDER_ERROR,
1907                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1908                                       "Expected name for binding set");
1909       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1910       goto skip_semicolon;
1911     }
1912
1913   binding_set = gtk_binding_set_find (name);
1914   if (!binding_set)
1915     {
1916       binding_set = gtk_binding_set_new (name);
1917       binding_set->parsed = TRUE;
1918     }
1919   g_free (name);
1920
1921   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
1922     {
1923       gtk_css_provider_error_literal (scanner->provider,
1924                                       scanner,
1925                                       GTK_CSS_PROVIDER_ERROR,
1926                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1927                                       "Expected '{' for binding set");
1928       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1929       goto skip_semicolon;
1930     }
1931
1932   while (!_gtk_css_parser_is_eof (scanner->parser) &&
1933          !_gtk_css_parser_begins_with (scanner->parser, '}'))
1934     {
1935       name = _gtk_css_parser_read_value (scanner->parser);
1936       if (name == NULL)
1937         {
1938           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1939           continue;
1940         }
1941
1942       if (gtk_binding_entry_add_signal_from_string (binding_set, name) != G_TOKEN_NONE)
1943         {
1944           gtk_css_provider_error_literal (scanner->provider,
1945                                           scanner,
1946                                           GTK_CSS_PROVIDER_ERROR,
1947                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1948                                           "Failed to parse binding set.");
1949         }
1950
1951       g_free (name);
1952
1953       if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1954         {
1955           if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
1956               !_gtk_css_parser_is_eof (scanner->parser))
1957             {
1958               gtk_css_provider_error_literal (scanner->provider,
1959                                               scanner,
1960                                               GTK_CSS_PROVIDER_ERROR,
1961                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
1962                                               "Expected semicolon");
1963               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1964             }
1965         }
1966     }
1967
1968   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
1969     {
1970       gtk_css_provider_error_literal (scanner->provider,
1971                                       scanner,
1972                                       GTK_CSS_PROVIDER_ERROR,
1973                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1974                                       "expected '}' after declarations");
1975       if (!_gtk_css_parser_is_eof (scanner->parser))
1976         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
1977     }
1978
1979 skip_semicolon:
1980   if (_gtk_css_parser_begins_with (scanner->parser, ';'))
1981     {
1982       gtk_css_provider_error_literal (scanner->provider,
1983                                       scanner,
1984                                       GTK_CSS_PROVIDER_ERROR,
1985                                       GTK_CSS_PROVIDER_ERROR_DEPRECATED,
1986                                       "Nonstandard semicolon at end of binding set");
1987       _gtk_css_parser_try (scanner->parser, ";", TRUE);
1988     }
1989
1990   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1991
1992   return TRUE;
1993 }
1994
1995 static void
1996 parse_at_keyword (GtkCssScanner *scanner)
1997 {
1998   if (parse_import (scanner))
1999     return;
2000   if (parse_color_definition (scanner))
2001     return;
2002   if (parse_binding_set (scanner))
2003     return;
2004
2005   else
2006     {
2007       gtk_css_provider_error_literal (scanner->provider,
2008                                       scanner,
2009                                       GTK_CSS_PROVIDER_ERROR,
2010                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2011                                       "unknown @ rule");
2012       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2013     }
2014 }
2015
2016 static gboolean
2017 parse_selector_class (GtkCssScanner *scanner, GArray *classes)
2018 {
2019   GQuark qname;
2020   char *name;
2021
2022   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
2023
2024   if (name == NULL)
2025     {
2026       gtk_css_provider_error_literal (scanner->provider,
2027                                       scanner,
2028                                       GTK_CSS_PROVIDER_ERROR,
2029                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2030                                       "Expected a valid name for class");
2031       return FALSE;
2032     }
2033
2034   qname = g_quark_from_string (name);
2035   g_array_append_val (classes, qname);
2036   g_free (name);
2037   return TRUE;
2038 }
2039
2040 static gboolean
2041 parse_selector_name (GtkCssScanner *scanner, GArray *names)
2042 {
2043   GQuark qname;
2044   char *name;
2045
2046   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
2047
2048   if (name == NULL)
2049     {
2050       gtk_css_provider_error_literal (scanner->provider,
2051                                       scanner,
2052                                       GTK_CSS_PROVIDER_ERROR,
2053                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2054                                       "Expected a valid name for id");
2055       return FALSE;
2056     }
2057
2058   qname = g_quark_from_string (name);
2059   g_array_append_val (names, qname);
2060   g_free (name);
2061   return TRUE;
2062 }
2063
2064 static gboolean
2065 parse_selector_pseudo_class (GtkCssScanner  *scanner,
2066                              GtkRegionFlags *region_to_modify,
2067                              GtkStateFlags  *state_to_modify)
2068 {
2069   struct {
2070     const char *name;
2071     GtkRegionFlags region_flag;
2072     GtkStateFlags state_flag;
2073   } pseudo_classes[] = {
2074     { "first-child",  GTK_REGION_FIRST, 0 },
2075     { "last-child",   GTK_REGION_LAST, 0 },
2076     { "only-child",   GTK_REGION_ONLY, 0 },
2077     { "sorted",       GTK_REGION_SORTED, 0 },
2078     { "active",       0, GTK_STATE_FLAG_ACTIVE },
2079     { "prelight",     0, GTK_STATE_FLAG_PRELIGHT },
2080     { "hover",        0, GTK_STATE_FLAG_PRELIGHT },
2081     { "selected",     0, GTK_STATE_FLAG_SELECTED },
2082     { "insensitive",  0, GTK_STATE_FLAG_INSENSITIVE },
2083     { "inconsistent", 0, GTK_STATE_FLAG_INCONSISTENT },
2084     { "focused",      0, GTK_STATE_FLAG_FOCUSED },
2085     { "focus",        0, GTK_STATE_FLAG_FOCUSED },
2086     { "backdrop",     0, GTK_STATE_FLAG_BACKDROP },
2087     { NULL, }
2088   }, nth_child_classes[] = {
2089     { "first",        GTK_REGION_FIRST, 0 },
2090     { "last",         GTK_REGION_LAST, 0 },
2091     { "even",         GTK_REGION_EVEN, 0 },
2092     { "odd",          GTK_REGION_ODD, 0 },
2093     { NULL, }
2094   }, *classes;
2095   guint i;
2096   char *name;
2097
2098   name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
2099   if (name == NULL)
2100     {
2101       gtk_css_provider_error_literal (scanner->provider,
2102                                       scanner,
2103                                       GTK_CSS_PROVIDER_ERROR,
2104                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2105                                       "Missing name of pseudo-class");
2106       return FALSE;
2107     }
2108
2109   if (_gtk_css_parser_try (scanner->parser, "(", TRUE))
2110     {
2111       char *function = name;
2112
2113       name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2114       if (!_gtk_css_parser_try (scanner->parser, ")", FALSE))
2115         {
2116           gtk_css_provider_error_literal (scanner->provider,
2117                                           scanner,
2118                                           GTK_CSS_PROVIDER_ERROR,
2119                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2120                                           "Missing closing bracket for pseudo-class");
2121           return FALSE;
2122         }
2123
2124       if (g_ascii_strcasecmp (function, "nth-child") != 0)
2125         {
2126           gtk_css_provider_error (scanner->provider,
2127                                   scanner,
2128                                   GTK_CSS_PROVIDER_ERROR,
2129                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2130                                   "Unknown pseudo-class '%s(%s)'", function, name ? name : "");
2131           g_free (function);
2132           g_free (name);
2133           return FALSE;
2134         }
2135
2136       g_free (function);
2137
2138       if (name == NULL)
2139         {
2140           gtk_css_provider_error (scanner->provider,
2141                                   scanner,
2142                                   GTK_CSS_PROVIDER_ERROR,
2143                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2144                                   "nth-child() requires an argument");
2145           return FALSE;
2146         }
2147
2148       classes = nth_child_classes;
2149     }
2150   else
2151     classes = pseudo_classes;
2152
2153   for (i = 0; classes[i].name != NULL; i++)
2154     {
2155       if (g_ascii_strcasecmp (name, classes[i].name) == 0)
2156         {
2157           if ((*region_to_modify & classes[i].region_flag) ||
2158               (*state_to_modify & classes[i].state_flag))
2159             {
2160               if (classes == nth_child_classes)
2161                 gtk_css_provider_error (scanner->provider,
2162                                         scanner,
2163                                         GTK_CSS_PROVIDER_ERROR,
2164                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
2165                                         "Duplicate pseudo-class 'nth-child(%s)'", name);
2166               else
2167                 gtk_css_provider_error (scanner->provider,
2168                                         scanner,
2169                                         GTK_CSS_PROVIDER_ERROR,
2170                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
2171                                         "Duplicate pseudo-class '%s'", name);
2172             }
2173           *region_to_modify |= classes[i].region_flag;
2174           *state_to_modify |= classes[i].state_flag;
2175
2176           g_free (name);
2177           return TRUE;
2178         }
2179     }
2180
2181   if (classes == nth_child_classes)
2182     gtk_css_provider_error (scanner->provider,
2183                             scanner,
2184                             GTK_CSS_PROVIDER_ERROR,
2185                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2186                             "Unknown pseudo-class 'nth-child(%s)'", name);
2187   else
2188     gtk_css_provider_error (scanner->provider,
2189                             scanner,
2190                             GTK_CSS_PROVIDER_ERROR,
2191                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2192                             "Unknown pseudo-class '%s'", name);
2193   g_free (name);
2194   return FALSE;
2195 }
2196
2197 static gboolean
2198 parse_simple_selector (GtkCssScanner *scanner,
2199                        char **name,
2200                        GArray *ids,
2201                        GArray *classes,
2202                        GtkRegionFlags *pseudo_classes,
2203                        GtkStateFlags *state)
2204 {
2205   gboolean parsed_something;
2206
2207   *name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
2208   if (*name)
2209     parsed_something = TRUE;
2210   else
2211     parsed_something = _gtk_css_parser_try (scanner->parser, "*", FALSE);
2212
2213   do {
2214       if (_gtk_css_parser_try (scanner->parser, "#", FALSE))
2215         {
2216           if (!parse_selector_name (scanner, ids))
2217             return FALSE;
2218         }
2219       else if (_gtk_css_parser_try (scanner->parser, ".", FALSE))
2220         {
2221           if (!parse_selector_class (scanner, classes))
2222             return FALSE;
2223         }
2224       else if (_gtk_css_parser_try (scanner->parser, ":", FALSE))
2225         {
2226           if (!parse_selector_pseudo_class (scanner, pseudo_classes, state))
2227             return FALSE;
2228         }
2229       else if (!parsed_something)
2230         {
2231           gtk_css_provider_error_literal (scanner->provider,
2232                                           scanner,
2233                                           GTK_CSS_PROVIDER_ERROR,
2234                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2235                                           "Expected a valid selector");
2236           return FALSE;
2237         }
2238       else
2239         break;
2240
2241       parsed_something = TRUE;
2242     }
2243   while (!_gtk_css_parser_is_eof (scanner->parser));
2244
2245   _gtk_css_parser_skip_whitespace (scanner->parser);
2246   return TRUE;
2247 }
2248
2249 static GtkCssSelector *
2250 parse_selector (GtkCssScanner *scanner)
2251 {
2252   GtkCssSelector *selector = NULL;
2253
2254   do {
2255       char *name = NULL;
2256       GArray *ids = g_array_new (TRUE, FALSE, sizeof (GQuark));
2257       GArray *classes = g_array_new (TRUE, FALSE, sizeof (GQuark));
2258       GtkRegionFlags pseudo_classes = 0;
2259       GtkStateFlags state = 0;
2260       GtkCssCombinator combine = GTK_CSS_COMBINE_DESCANDANT;
2261
2262       if (selector)
2263         {
2264           if (_gtk_css_parser_try (scanner->parser, ">", TRUE))
2265             combine = GTK_CSS_COMBINE_CHILD;
2266         }
2267
2268       if (!parse_simple_selector (scanner, &name, ids, classes, &pseudo_classes, &state))
2269         {
2270           g_array_free (ids, TRUE);
2271           g_array_free (classes, TRUE);
2272           if (selector)
2273             _gtk_css_selector_free (selector);
2274           return NULL;
2275         }
2276
2277       selector = _gtk_css_selector_new (selector,
2278                                         combine,
2279                                         name,
2280                                         (GQuark *) g_array_free (ids, ids->len == 0),
2281                                         (GQuark *) g_array_free (classes, classes->len == 0),
2282                                         pseudo_classes,
2283                                         state);
2284       g_free (name);
2285     }
2286   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2287          !_gtk_css_parser_begins_with (scanner->parser, ',') &&
2288          !_gtk_css_parser_begins_with (scanner->parser, '{'));
2289
2290   return selector;
2291 }
2292
2293 static GSList *
2294 parse_selector_list (GtkCssScanner *scanner)
2295 {
2296   GSList *selectors = NULL;
2297
2298   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_SELECTOR);
2299
2300   do {
2301       GtkCssSelector *select = parse_selector (scanner);
2302
2303       if (select == NULL)
2304         {
2305           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2306           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2307           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2308           return NULL;
2309         }
2310
2311       selectors = g_slist_prepend (selectors, select);
2312     }
2313   while (_gtk_css_parser_try (scanner->parser, ",", TRUE));
2314
2315   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2316
2317   return selectors;
2318 }
2319
2320 static void
2321 parse_declaration (GtkCssScanner *scanner,
2322                    GtkCssRuleset *ruleset)
2323 {
2324   GtkStyleProperty *property;
2325   char *name;
2326
2327   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DECLARATION);
2328
2329   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2330   if (name == NULL)
2331     goto check_for_semicolon;
2332
2333   property = _gtk_style_property_lookup (name);
2334   if (property == NULL && name[0] != '-')
2335     {
2336       gtk_css_provider_error (scanner->provider,
2337                               scanner,
2338                               GTK_CSS_PROVIDER_ERROR,
2339                               GTK_CSS_PROVIDER_ERROR_NAME,
2340                               "'%s' is not a valid property name",
2341                               name);
2342       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2343       g_free (name);
2344       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2345       return;
2346     }
2347
2348   if (!_gtk_css_parser_try (scanner->parser, ":", TRUE))
2349     {
2350       gtk_css_provider_invalid_token (scanner->provider, scanner, "':'");
2351       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2352       g_free (name);
2353       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2354       return;
2355     }
2356
2357   if (property)
2358     {
2359       PropertyValue *val;
2360
2361       g_free (name);
2362
2363       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2364
2365       val = property_value_new (scanner->section);
2366
2367       if (_gtk_style_property_parse_value (property,
2368                                            &val->value,
2369                                            scanner->parser,
2370                                            gtk_css_scanner_get_base_url (scanner)))
2371         {
2372           if (_gtk_css_parser_begins_with (scanner->parser, ';') ||
2373               _gtk_css_parser_begins_with (scanner->parser, '}') ||
2374               _gtk_css_parser_is_eof (scanner->parser))
2375             {
2376               gtk_css_ruleset_add (ruleset, property, val);
2377             }
2378           else
2379             {
2380               gtk_css_provider_error_literal (scanner->provider,
2381                                               scanner,
2382                                               GTK_CSS_PROVIDER_ERROR,
2383                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
2384                                               "Junk at end of value");
2385               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2386               property_value_free (val);
2387               gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2388               gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2389               return;
2390             }
2391         }
2392       else
2393         {
2394           property_value_free (val);
2395           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2396           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2397           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2398           return;
2399         }
2400       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2401     }
2402   else if (name[0] == '-')
2403     {
2404       char *value_str;
2405
2406       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2407
2408       value_str = _gtk_css_parser_read_value (scanner->parser);
2409       if (value_str)
2410         {
2411           PropertyValue *val;
2412
2413           val = property_value_new (scanner->section);
2414           g_value_init (&val->value, G_TYPE_STRING);
2415           g_value_take_string (&val->value, value_str);
2416
2417           gtk_css_ruleset_add_style (ruleset, name, val);
2418         }
2419       else
2420         {
2421           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2422           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2423           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2424           return;
2425         }
2426
2427       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2428     }
2429   else
2430     g_free (name);
2431
2432 check_for_semicolon:
2433   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2434
2435   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2436     {
2437       if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2438           !_gtk_css_parser_is_eof (scanner->parser))
2439         {
2440           gtk_css_provider_error_literal (scanner->provider,
2441                                           scanner,
2442                                           GTK_CSS_PROVIDER_ERROR,
2443                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2444                                           "Expected semicolon");
2445           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2446         }
2447     }
2448 }
2449
2450 static void
2451 parse_declarations (GtkCssScanner *scanner,
2452                     GtkCssRuleset *ruleset)
2453 {
2454   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2455          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2456     {
2457       parse_declaration (scanner, ruleset);
2458     }
2459 }
2460
2461 static void
2462 parse_ruleset (GtkCssScanner *scanner)
2463 {
2464   GSList *selectors;
2465   GtkCssRuleset ruleset = { 0, };
2466
2467   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_RULESET);
2468
2469   selectors = parse_selector_list (scanner);
2470   if (selectors == NULL)
2471     {
2472       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2473       return;
2474     }
2475
2476   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2477     {
2478       gtk_css_provider_error_literal (scanner->provider,
2479                                       scanner,
2480                                       GTK_CSS_PROVIDER_ERROR,
2481                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2482                                       "expected '{' after selectors");
2483       _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2484       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2485       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2486       return;
2487     }
2488
2489   parse_declarations (scanner, &ruleset);
2490
2491   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2492     {
2493       gtk_css_provider_error_literal (scanner->provider,
2494                                       scanner,
2495                                       GTK_CSS_PROVIDER_ERROR,
2496                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2497                                       "expected '}' after declarations");
2498       if (!_gtk_css_parser_is_eof (scanner->parser))
2499         {
2500           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2501           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2502           gtk_css_ruleset_clear (&ruleset);
2503           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2504         }
2505     }
2506
2507   css_provider_commit (scanner->provider, selectors, &ruleset);
2508   gtk_css_ruleset_clear (&ruleset);
2509   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2510 }
2511
2512 static void
2513 parse_statement (GtkCssScanner *scanner)
2514 {
2515   if (_gtk_css_parser_begins_with (scanner->parser, '@'))
2516     parse_at_keyword (scanner);
2517   else
2518     parse_ruleset (scanner);
2519 }
2520
2521 static void
2522 parse_stylesheet (GtkCssScanner *scanner)
2523 {
2524   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2525
2526   _gtk_css_parser_skip_whitespace (scanner->parser);
2527
2528   while (!_gtk_css_parser_is_eof (scanner->parser))
2529     {
2530       if (_gtk_css_parser_try (scanner->parser, "<!--", TRUE) ||
2531           _gtk_css_parser_try (scanner->parser, "-->", TRUE))
2532         continue;
2533
2534       parse_statement (scanner);
2535     }
2536
2537   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2538 }
2539
2540 static int
2541 gtk_css_provider_compare_rule (gconstpointer a_,
2542                                gconstpointer b_)
2543 {
2544   const GtkCssRuleset *a = (const GtkCssRuleset *) a_;
2545   const GtkCssRuleset *b = (const GtkCssRuleset *) b_;
2546   int compare;
2547
2548   compare = _gtk_css_selector_compare (a->selector, b->selector);
2549   if (compare != 0)
2550     return compare;
2551
2552   /* compare pointers in array to ensure a stable sort */
2553   if (a_ < b_)
2554     return -1;
2555
2556   if (a_ > b_)
2557     return 1;
2558
2559   return 0;
2560 }
2561
2562 static void
2563 gtk_css_provider_postprocess (GtkCssProvider *css_provider)
2564 {
2565   GtkCssProviderPrivate *priv = css_provider->priv;
2566
2567   g_array_sort (priv->rulesets, gtk_css_provider_compare_rule);
2568 }
2569
2570 static gboolean
2571 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
2572                                 GtkCssScanner  *parent,
2573                                 GFile          *file,
2574                                 const char     *text,
2575                                 GError        **error)
2576 {
2577   GtkCssScanner *scanner;
2578   gulong error_handler;
2579   char *free_data = NULL;
2580
2581   if (error)
2582     error_handler = g_signal_connect (css_provider,
2583                                       "parsing-error",
2584                                       G_CALLBACK (gtk_css_provider_propagate_error),
2585                                       error);
2586   else
2587     error_handler = 0; /* silence gcc */
2588
2589   if (text == NULL)
2590     {
2591       GError *load_error = NULL;
2592
2593       if (g_file_load_contents (file, NULL,
2594                                 &free_data, NULL,
2595                                 NULL, &load_error))
2596         {
2597           text = free_data;
2598         }
2599       else
2600         {
2601           GtkCssSection *section;
2602
2603           if (parent)
2604             section = gtk_css_section_ref (parent->section);
2605           else
2606             section = _gtk_css_section_new_for_file (GTK_CSS_SECTION_DOCUMENT, file);
2607
2608           gtk_css_provider_error (css_provider,
2609                                   parent,
2610                                   GTK_CSS_PROVIDER_ERROR,
2611                                   GTK_CSS_PROVIDER_ERROR_IMPORT,
2612                                   "Failed to import: %s",
2613                                   load_error->message);
2614
2615           gtk_css_section_unref (section);
2616         }
2617     }
2618
2619   if (text)
2620     {
2621       scanner = gtk_css_scanner_new (css_provider,
2622                                      parent,
2623                                      parent ? parent->section : NULL,
2624                                      file,
2625                                      text);
2626
2627       parse_stylesheet (scanner);
2628
2629       gtk_css_scanner_destroy (scanner);
2630
2631       if (parent == NULL)
2632         gtk_css_provider_postprocess (css_provider);
2633     }
2634
2635   g_free (free_data);
2636
2637   if (error)
2638     {
2639       g_signal_handler_disconnect (css_provider, error_handler);
2640
2641       if (*error)
2642         {
2643           /* We clear all contents from the provider for backwards compat reasons */
2644           gtk_css_provider_reset (css_provider);
2645           return FALSE;
2646         }
2647     }
2648
2649   return TRUE;
2650 }
2651
2652 /**
2653  * gtk_css_provider_load_from_data:
2654  * @css_provider: a #GtkCssProvider
2655  * @data: (array length=length) (element-type guint8): CSS data loaded in memory
2656  * @length: the length of @data in bytes, or -1 for NUL terminated strings. If
2657  *   @length is not -1, the code will assume it is not NUL terminated and will
2658  *   potentially do a copy.
2659  * @error: (out) (allow-none): return location for a #GError, or %NULL
2660  *
2661  * Loads @data into @css_provider, making it clear any previously loaded
2662  * information.
2663  *
2664  * Returns: %TRUE if the data could be loaded.
2665  **/
2666 gboolean
2667 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2668                                  const gchar     *data,
2669                                  gssize           length,
2670                                  GError         **error)
2671 {
2672   char *free_data;
2673   gboolean ret;
2674
2675   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2676   g_return_val_if_fail (data != NULL, FALSE);
2677
2678   if (length < 0)
2679     {
2680       length = strlen (data);
2681       free_data = NULL;
2682     }
2683   else
2684     {
2685       free_data = g_strndup (data, length);
2686       data = free_data;
2687     }
2688
2689   gtk_css_provider_reset (css_provider);
2690
2691   ret = gtk_css_provider_load_internal (css_provider, NULL, NULL, data, error);
2692
2693   g_free (free_data);
2694
2695   return ret;
2696 }
2697
2698 /**
2699  * gtk_css_provider_load_from_file:
2700  * @css_provider: a #GtkCssProvider
2701  * @file: #GFile pointing to a file to load
2702  * @error: (out) (allow-none): return location for a #GError, or %NULL
2703  *
2704  * Loads the data contained in @file into @css_provider, making it
2705  * clear any previously loaded information.
2706  *
2707  * Returns: %TRUE if the data could be loaded.
2708  **/
2709 gboolean
2710 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2711                                  GFile           *file,
2712                                  GError         **error)
2713 {
2714   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2715   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2716
2717   gtk_css_provider_reset (css_provider);
2718
2719   return gtk_css_provider_load_internal (css_provider, NULL, file, NULL, error);
2720 }
2721
2722 /**
2723  * gtk_css_provider_load_from_path:
2724  * @css_provider: a #GtkCssProvider
2725  * @path: the path of a filename to load, in the GLib filename encoding
2726  * @error: (out) (allow-none): return location for a #GError, or %NULL
2727  *
2728  * Loads the data contained in @path into @css_provider, making it clear
2729  * any previously loaded information.
2730  *
2731  * Returns: %TRUE if the data could be loaded.
2732  **/
2733 gboolean
2734 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2735                                  const gchar     *path,
2736                                  GError         **error)
2737 {
2738   GFile *file;
2739   gboolean result;
2740
2741   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2742   g_return_val_if_fail (path != NULL, FALSE);
2743
2744   file = g_file_new_for_path (path);
2745
2746   result = gtk_css_provider_load_from_file (css_provider, file, error);
2747
2748   g_object_unref (file);
2749
2750   return result;
2751 }
2752
2753 static gboolean
2754 _gtk_css_provider_load_from_resource (GtkCssProvider  *css_provider,
2755                                       const gchar     *resource_path)
2756 {
2757   GFile *file;
2758   char *uri, *escaped;
2759   gboolean result;
2760
2761   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2762   g_return_val_if_fail (resource_path != NULL, FALSE);
2763
2764   escaped = g_uri_escape_string (resource_path,
2765                                  G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, FALSE);
2766   uri = g_strconcat ("resource://", escaped, NULL);
2767   g_free (escaped);
2768
2769   file = g_file_new_for_uri (uri);
2770   g_free (uri);
2771
2772   result = gtk_css_provider_load_from_file (css_provider, file, NULL);
2773
2774   g_object_unref (file);
2775
2776   return result;
2777 }
2778
2779 /**
2780  * gtk_css_provider_get_default:
2781  *
2782  * Returns the provider containing the style settings used as a
2783  * fallback for all widgets.
2784  *
2785  * Returns: (transfer none): The provider used for fallback styling.
2786  *          This memory is owned by GTK+, and you must not free it.
2787  **/
2788 GtkCssProvider *
2789 gtk_css_provider_get_default (void)
2790 {
2791   static GtkCssProvider *provider;
2792
2793   if (G_UNLIKELY (!provider))
2794     {
2795       provider = gtk_css_provider_new ();
2796       if (!_gtk_css_provider_load_from_resource (provider, "/org/gtk/libgtk/gtk-default.css"))
2797         {
2798           g_error ("Failed to load the internal default CSS.");
2799         }
2800     }
2801
2802   return provider;
2803 }
2804
2805 gchar *
2806 _gtk_css_provider_get_theme_dir (void)
2807 {
2808   const gchar *var;
2809   gchar *path;
2810
2811   var = g_getenv ("GTK_DATA_PREFIX");
2812
2813   if (var)
2814     path = g_build_filename (var, "share", "themes", NULL);
2815   else
2816     path = g_build_filename (_gtk_get_data_prefix (), "share", "themes", NULL);
2817
2818   return path;
2819 }
2820
2821 /**
2822  * gtk_css_provider_get_named:
2823  * @name: A theme name
2824  * @variant: (allow-none): variant to load, for example, "dark", or
2825  *     %NULL for the default
2826  *
2827  * Loads a theme from the usual theme paths
2828  *
2829  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
2830  *     This memory is owned by GTK+, and you must not free it.
2831  */
2832 GtkCssProvider *
2833 gtk_css_provider_get_named (const gchar *name,
2834                             const gchar *variant)
2835 {
2836   static GHashTable *themes = NULL;
2837   GtkCssProvider *provider;
2838   gchar *key;
2839
2840   if (G_UNLIKELY (!themes))
2841     {
2842       themes = g_hash_table_new (g_str_hash, g_str_equal);
2843
2844       provider = gtk_css_provider_new ();
2845       if (!_gtk_css_provider_load_from_resource (provider, "/org/gtk/libgtk/gtk-win32.css"))
2846         {
2847           g_warning ("Failed to load the internal win32 default CSS.");
2848           g_object_unref (provider);
2849         }
2850       else
2851         g_hash_table_insert (themes, "gtk-win32", provider);
2852     }
2853
2854   if (variant == NULL)
2855     key = (gchar *)name;
2856   else
2857     key = g_strconcat (name, "-", variant, NULL);
2858
2859   provider = g_hash_table_lookup (themes, key);
2860
2861   if (!provider)
2862     {
2863       const gchar *home_dir;
2864       gchar *subpath, *path = NULL;
2865
2866       if (variant)
2867         subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
2868       else
2869         subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
2870
2871       /* First look in the users home directory
2872        */
2873       home_dir = g_get_home_dir ();
2874       if (home_dir)
2875         {
2876           path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
2877
2878           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2879             {
2880               g_free (path);
2881               path = NULL;
2882             }
2883         }
2884
2885       if (!path)
2886         {
2887           gchar *theme_dir;
2888
2889           theme_dir = _gtk_css_provider_get_theme_dir ();
2890           path = g_build_filename (theme_dir, name, subpath, NULL);
2891           g_free (theme_dir);
2892
2893           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2894             {
2895               g_free (path);
2896               path = NULL;
2897             }
2898         }
2899
2900       g_free (subpath);
2901
2902       if (path)
2903         {
2904           provider = gtk_css_provider_new ();
2905
2906           if (!gtk_css_provider_load_from_path (provider, path, NULL))
2907             {
2908               g_object_unref (provider);
2909               provider = NULL;
2910             }
2911           else
2912             g_hash_table_insert (themes, g_strdup (key), provider);
2913
2914           g_free (path);
2915         }
2916     }
2917
2918   if (key != name)
2919     g_free (key);
2920
2921   return provider;
2922 }
2923
2924 static int
2925 compare_properties (gconstpointer a, gconstpointer b)
2926 {
2927   return strcmp (_gtk_style_property_get_name ((GtkStyleProperty *) a),
2928                  _gtk_style_property_get_name ((GtkStyleProperty *) b));
2929 }
2930
2931 static void
2932 gtk_css_ruleset_print (const GtkCssRuleset *ruleset,
2933                        GString             *str)
2934 {
2935   GList *keys, *walk;
2936
2937   _gtk_css_selector_print (ruleset->selector, str);
2938
2939   g_string_append (str, " {\n");
2940
2941   if (ruleset->style)
2942     {
2943       keys = g_hash_table_get_keys (ruleset->style);
2944       /* so the output is identical for identical selector styles */
2945       keys = g_list_sort (keys, compare_properties);
2946
2947       for (walk = keys; walk; walk = walk->next)
2948         {
2949           GtkCssStyleProperty *prop = walk->data;
2950           const PropertyValue *value = g_hash_table_lookup (ruleset->style, prop);
2951
2952           g_string_append (str, "  ");
2953           g_string_append (str, _gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop)));
2954           g_string_append (str, ": ");
2955           _gtk_css_style_property_print_value (prop, &value->value, str);
2956           g_string_append (str, ";\n");
2957         }
2958
2959       g_list_free (keys);
2960     }
2961
2962   if (ruleset->widget_style)
2963     {
2964       keys = g_hash_table_get_keys (ruleset->widget_style);
2965       /* so the output is identical for identical selector styles */
2966       keys = g_list_sort (keys, (GCompareFunc) strcmp);
2967
2968       for (walk = keys; walk; walk = walk->next)
2969         {
2970           const char *name = walk->data;
2971           const PropertyValue *value = g_hash_table_lookup (ruleset->widget_style, (gpointer) name);
2972
2973           g_string_append (str, "  ");
2974           g_string_append (str, name);
2975           g_string_append (str, ": ");
2976           g_string_append (str, g_value_get_string (&value->value));
2977           g_string_append (str, ";\n");
2978         }
2979
2980       g_list_free (keys);
2981     }
2982
2983   g_string_append (str, "}\n");
2984 }
2985
2986 static void
2987 gtk_css_provider_print_colors (GHashTable *colors,
2988                                GString    *str)
2989 {
2990   GList *keys, *walk;
2991   char *s;
2992
2993   keys = g_hash_table_get_keys (colors);
2994   /* so the output is identical for identical styles */
2995   keys = g_list_sort (keys, (GCompareFunc) strcmp);
2996
2997   for (walk = keys; walk; walk = walk->next)
2998     {
2999       const char *name = walk->data;
3000       GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
3001
3002       g_string_append (str, "@define-color ");
3003       g_string_append (str, name);
3004       g_string_append (str, " ");
3005       s = gtk_symbolic_color_to_string (symbolic);
3006       g_string_append (str, s);
3007       g_free (s);
3008       g_string_append (str, ";\n");
3009     }
3010
3011   g_list_free (keys);
3012 }
3013
3014 /**
3015  * gtk_css_provider_to_string:
3016  * @provider: the provider to write to a string
3017  *
3018  * Convertes the @provider into a string representation in CSS
3019  * format.
3020  *
3021  * Using gtk_css_provider_load_from_data() with the return value
3022  * from this function on a new provider created with
3023  * gtk_css_provider_new() will basicallu create a duplicate of
3024  * this @provider.
3025  *
3026  * Returns: a new string representing the @provider.
3027  *
3028  * Since: 3.2
3029  **/
3030 char *
3031 gtk_css_provider_to_string (GtkCssProvider *provider)
3032 {
3033   GtkCssProviderPrivate *priv;
3034   GString *str;
3035   guint i;
3036
3037   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
3038
3039   priv = provider->priv;
3040
3041   str = g_string_new ("");
3042
3043   gtk_css_provider_print_colors (priv->symbolic_colors, str);
3044
3045   for (i = 0; i < priv->rulesets->len; i++)
3046     {
3047       if (i > 0)
3048         g_string_append (str, "\n");
3049       gtk_css_ruleset_print (&g_array_index (priv->rulesets, GtkCssRuleset, i), str);
3050     }
3051
3052   return g_string_free (str, FALSE);
3053 }
3054