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 "gtkcssparserprivate.h"
  31 #include "gtkcssselectorprivate.h"
  32 #include "gtksymboliccolor.h"
  33 #include "gtkstyleprovider.h"
  34 #include "gtkstylecontextprivate.h"
  35 #include "gtkstylepropertiesprivate.h"
  36 #include "gtkstylepropertyprivate.h"
  37 #include "gtkbindings.h"
  38 #include "gtkmarshalers.h"
  39 #include "gtkprivate.h"
  40 #include "gtkintl.h"
  41
  42 /**
  43  * SECTION:gtkcssprovider
  44  * @Short_description: CSS-like styling for widgets
  45  * @Title: GtkCssProvider
  46  * @See_also: #GtkStyleContext, #GtkStyleProvider
  47  *
  48  * GtkCssProvider is an object implementing the #GtkStyleProvider interface.
  49  * It is able to parse <ulink url="http://www.w3.org/TR/CSS2">CSS</ulink>-like
  50  * input in order to style widgets.
  51  *
  52  * <refsect2 id="gtkcssprovider-files">
  53  * <title>Default files</title>
  54  * <para>
  55  * An application can cause GTK+ to parse a specific CSS style sheet by
  56  * calling gtk_css_provider_load_from_file() and adding the provider with
  57  * gtk_style_context_add_provider() or gtk_style_context_add_provider_for_screen().
  58  * In addition, certain files will be read when GTK+ is initialized. First,
  59  * the file <filename><envar>$XDG_CONFIG_HOME</envar>/gtk-3.0/gtk.css</filename>
  60  * is loaded if it exists. Then, GTK+ tries to load
  61  * <filename><envar>$HOME</envar>/.themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  62  * falling back to
  63  * <filename><replaceable>datadir</replaceable>/share/themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  64  * where <replaceable>theme-name</replaceable> is the name of the current theme
  65  * (see the #GtkSettings:gtk-theme-name setting) and <replaceable>datadir</replaceable>
  66  * is the prefix configured when GTK+ was compiled, unless overridden by the
  67  * <envar>GTK_DATA_PREFIX</envar> environment variable.
  68  * </para>
  69  * </refsect2>
  70  * <refsect2 id="gtkcssprovider-stylesheets">
  71  * <title>Style sheets</title>
  72  * <para>
  73  * The basic structure of the style sheets understood by this provider is
  74  * a series of statements, which are either rule sets or '@-rules', separated
  75  * by whitespace.
  76  * </para>
  77  * <para>
  78  * A rule set consists of a selector and a declaration block, which is
  79  * a series of declarations enclosed in curly braces ({ and }). The
  80  * declarations are separated by semicolons (;). Multiple selectors can
  81  * share the same declaration block, by putting all the separators in
  82  * front of the block, separated by commas.
  83  * </para>
  84  * <example><title>A rule set with two selectors</title>
  85  * <programlisting language="text">
  86  * GtkButton, GtkEntry {
  87  *     color: &num;ff00ea;
  88  *     font: Comic Sans 12
  89  * }
  90  * </programlisting>
  91  * </example>
  92  * </refsect2>
  93  * <refsect2 id="gtkcssprovider-selectors">
  94  * <title>Selectors</title>
  95  * <para>
  96  * Selectors work very similar to the way they do in CSS, with widget class
  97  * names taking the role of element names, and widget names taking the role
  98  * of IDs. When used in a selector, widget names must be prefixed with a
  99  * '&num;' character. The '*' character represents the so-called universal
 100  * selector, which matches any widget.
 101  * </para>
 102  * <para>
 103  * To express more complicated situations, selectors can be combined in
 104  * various ways:
 105  * <itemizedlist>
 106  * <listitem><para>To require that a widget satisfies several conditions,
 107  *   combine several selectors into one by concatenating them. E.g.
 108  *   <literal>GtkButton&num;button1</literal> matches a GtkButton widget
 109  *   with the name button1.</para></listitem>
 110  * <listitem><para>To only match a widget when it occurs inside some other
 111  *   widget, write the two selectors after each other, separated by whitespace.
 112  *   E.g. <literal>GtkToolBar GtkButton</literal> matches GtkButton widgets
 113  *   that occur inside a GtkToolBar.</para></listitem>
 114  * <listitem><para>In the previous example, the GtkButton is matched even
 115  *   if it occurs deeply nested inside the toolbar. To restrict the match
 116  *   to direct children of the parent widget, insert a '>' character between
 117  *   the two selectors. E.g. <literal>GtkNotebook > GtkLabel</literal> matches
 118  *   GtkLabel widgets that are direct children of a GtkNotebook.</para></listitem>
 119  * </itemizedlist>
 120  * </para>
 121  * <example>
 122  * <title>Widget classes and names in selectors</title>
 123  * <programlisting language="text">
 124  * /&ast; Theme labels that are descendants of a window &ast;/
 125  * GtkWindow GtkLabel {
 126  *     background-color: &num;898989
 127  * }
 128  *
 129  * /&ast; Theme notebooks, and anything that's within these &ast;/
 130  * GtkNotebook {
 131  *     background-color: &num;a939f0
 132  * }
 133  *
 134  * /&ast; Theme combo boxes, and entries that
 135  *  are direct children of a notebook &ast;/
 136  * GtkComboBox,
 137  * GtkNotebook > GtkEntry {
 138  *     color: @fg_color;
 139  *     background-color: &num;1209a2
 140  * }
 141  *
 142  * /&ast; Theme any widget within a GtkBin &ast;/
 143  * GtkBin * {
 144  *     font: Sans 20
 145  * }
 146  *
 147  * /&ast; Theme a label named title-label &ast;/
 148  * GtkLabel&num;title-label {
 149  *     font: Sans 15
 150  * }
 151  *
 152  * /&ast; Theme any widget named main-entry &ast;/
 153  * &num;main-entry {
 154  *     background-color: &num;f0a810
 155  * }
 156  * </programlisting>
 157  * </example>
 158  * <para>
 159  * Widgets may also define style classes, which can be used for matching.
 160  * When used in a selector, style classes must be prefixed with a '.'
 161  * character.
 162  * </para>
 163  * <para>
 164  * Refer to the documentation of individual widgets to learn which
 165  * style classes they define and see <xref linkend="gtkstylecontext-classes"/>
 166  * for a list of all style classes used by GTK+ widgets.
 167  * </para>
 168  * <para>
 169  * Note that there is some ambiguity in the selector syntax when it comes
 170  * to differentiation widget class names from regions. GTK+ currently treats
 171  * a string as a widget class name if it contains any uppercase characters
 172  * (which should work for more widgets with names like GtkLabel).
 173  * </para>
 174  * <example>
 175  * <title>Style classes in selectors</title>
 176  * <programlisting language="text">
 177  * /&ast; Theme all widgets defining the class entry &ast;/
 178  * .entry {
 179  *     color: &num;39f1f9;
 180  * }
 181  *
 182  * /&ast; Theme spinbuttons' entry &ast;/
 183  * GtkSpinButton.entry {
 184  *     color: &num;900185
 185  * }
 186  * </programlisting>
 187  * </example>
 188  * <para>
 189  * In complicated widgets like e.g. a GtkNotebook, it may be desirable
 190  * to style different parts of the widget differently. To make this
 191  * possible, container widgets may define regions, whose names
 192  * may be used for matching in selectors.
 193  * </para>
 194  * <para>
 195  * Some containers allow to further differentiate between regions by
 196  * applying so-called pseudo-classes to the region. For example, the
 197  * tab region in GtkNotebook allows to single out the first or last
 198  * tab by using the :first-child or :last-child pseudo-class.
 199  * When used in selectors, pseudo-classes must be prefixed with a
 200  * ':' character.
 201  * </para>
 202  * <para>
 203  * Refer to the documentation of individual widgets to learn which
 204  * regions and pseudo-classes they define and see
 205  * <xref linkend="gtkstylecontext-classes"/> for a list of all regions
 206  * used by GTK+ widgets.
 207  * </para>
 208  * <example>
 209  * <title>Regions in selectors</title>
 210  * <programlisting language="text">
 211  * /&ast; Theme any label within a notebook &ast;/
 212  * GtkNotebook GtkLabel {
 213  *     color: &num;f90192;
 214  * }
 215  *
 216  * /&ast; Theme labels within notebook tabs &ast;/
 217  * GtkNotebook tab GtkLabel {
 218  *     color: &num;703910;
 219  * }
 220  *
 221  * /&ast; Theme labels in the any first notebook
 222  *  tab, both selectors are equivalent &ast;/
 223  * GtkNotebook tab:nth-child(first) GtkLabel,
 224  * GtkNotebook tab:first-child GtkLabel {
 225  *     color: &num;89d012;
 226  * }
 227  * </programlisting>
 228  * </example>
 229  * <para>
 230  * Another use of pseudo-classes is to match widgets depending on their
 231  * state. This is conceptually similar to the :hover, :active or :focus
 232  * pseudo-classes in CSS. The available pseudo-classes for widget states
 233  * are :active, :prelight (or :hover), :insensitive, :selected, :focused
 234  * and :inconsistent.
 235  * </para>
 236  * <example>
 237  * <title>Styling specific widget states</title>
 238  * <programlisting language="text">
 239  * /&ast; Theme active (pressed) buttons &ast;/
 240  * GtkButton:active {
 241  *     background-color: &num;0274d9;
 242  * }
 243  *
 244  * /&ast; Theme buttons with the mouse pointer on it,
 245  *    both are equivalent &ast;/
 246  * GtkButton:hover,
 247  * GtkButton:prelight {
 248  *     background-color: &num;3085a9;
 249  * }
 250  *
 251  * /&ast; Theme insensitive widgets, both are equivalent &ast;/
 252  * :insensitive,
 253  * *:insensitive {
 254  *     background-color: &num;320a91;
 255  * }
 256  *
 257  * /&ast; Theme selection colors in entries &ast;/
 258  * GtkEntry:selected {
 259  *     background-color: &num;56f9a0;
 260  * }
 261  *
 262  * /&ast; Theme focused labels &ast;/
 263  * GtkLabel:focused {
 264  *     background-color: &num;b4940f;
 265  * }
 266  *
 267  * /&ast; Theme inconsistent checkbuttons &ast;/
 268  * GtkCheckButton:inconsistent {
 269  *     background-color: &num;20395a;
 270  * }
 271  * </programlisting>
 272  * </example>
 273  * <para>
 274  * Widget state pseudoclasses may only apply to the last element
 275  * in a selector.
 276  * </para>
 277  * <para>
 278  * To determine the effective style for a widget, all the matching rule
 279  * sets are merged. As in CSS, rules apply by specificity, so the rules
 280  * whose selectors more closely match a widget path will take precedence
 281  * over the others.
 282  * </para>
 283  * </refsect2>
 284  * <refsect2 id="gtkcssprovider-rules">
 285  * <title>&commat; Rules</title>
 286  * <para>
 287  * GTK+'s CSS supports the &commat;import rule, in order to load another
 288  * CSS style sheet in addition to the currently parsed one.
 289  * </para>
 290  * <example>
 291  * <title>Using the &commat;import rule</title>
 292  * <programlisting language="text">
 293  * &commat;import url ("path/to/common.css");
 294  * </programlisting>
 295  * </example>
 296  * <para id="css-binding-set">
 297  * In order to extend key bindings affecting different widgets, GTK+
 298  * supports the &commat;binding-set rule to parse a set of bind/unbind
 299  * directives, see #GtkBindingSet for the supported syntax. Note that
 300  * the binding sets defined in this way must be associated with rule sets
 301  * by setting the gtk-key-bindings style property.
 302  * </para>
 303  * <para>
 304  * Customized key bindings are typically defined in a separate
 305  * <filename>gtk-keys.css</filename> CSS file and GTK+ loads this file
 306  * according to the current key theme, which is defined by the
 307  * #GtkSettings:gtk-key-theme-name setting.
 308  * </para>
 309  * <example>
 310  * <title>Using the &commat;binding rule</title>
 311  * <programlisting language="text">
 312  * &commat;binding-set binding-set1 {
 313  *   bind "&lt;alt&gt;Left" { "move-cursor" (visual-positions, -3, 0) };
 314  *   unbind "End";
 315  * };
 316  *
 317  * &commat;binding-set binding-set2 {
 318  *   bind "&lt;alt&gt;Right" { "move-cursor" (visual-positions, 3, 0) };
 319  *   bind "&lt;alt&gt;KP_space" { "delete-from-cursor" (whitespace, 1)
 320  *                          "insert-at-cursor" (" ") };
 321  * };
 322  *
 323  * GtkEntry {
 324  *   gtk-key-bindings: binding-set1, binding-set2;
 325  * }
 326  * </programlisting>
 327  * </example>
 328  * <para>
 329  * GTK+ also supports an additional &commat;define-color rule, in order
 330  * to define a color name which may be used instead of color numeric
 331  * representations. Also see the #GtkSettings:gtk-color-scheme setting
 332  * for a way to override the values of these named colors.
 333  * </para>
 334  * <example>
 335  * <title>Defining colors</title>
 336  * <programlisting language="text">
 337  * &commat;define-color bg_color &num;f9a039;
 338  *
 339  * &ast; {
 340  *     background-color: &commat;bg_color;
 341  * }
 342  * </programlisting>
 343  * </example>
 344  * </refsect2>
 345  * <refsect2 id="gtkcssprovider-symbolic-colors">
 346  * <title>Symbolic colors</title>
 347  * <para>
 348  * Besides being able to define color names, the CSS parser is also able
 349  * to read different color expressions, which can also be nested, providing
 350  * a rich language to define colors which are derived from a set of base
 351  * colors.
 352  * </para>
 353  * <example>
 354  * <title>Using symbolic colors</title>
 355  * <programlisting language="text">
 356  * &commat;define-color entry-color shade (&commat;bg_color, 0.7);
 357  *
 358  * GtkEntry {
 359  *     background-color: @entry-color;
 360  * }
 361  *
 362  * GtkEntry:focused {
 363  *     background-color: mix (&commat;entry-color,
 364  *                            shade (&num;fff, 0.5),
 365  *                            0.8);
 366  * }
 367  * </programlisting>
 368  * </example>
 369  * <para>
 370  *   The various ways to express colors in GTK+ CSS are:
 371  * </para>
 372  * <informaltable>
 373  *   <tgroup cols="3">
 374  *     <thead>
 375  *       <row>
 376  *         <entry>Syntax</entry>
 377  *         <entry>Explanation</entry>
 378  *         <entry>Examples</entry>
 379  *       </row>
 380  *     </thead>
 381  *     <tbody>
 382  *       <row>
 383  *         <entry>rgb(@r, @g, @b)</entry>
 384  *         <entry>An opaque color; @r, @g, @b can be either integers between
 385  *                0 and 255 or percentages</entry>
 386  *         <entry><literallayout>rgb(128, 10, 54)
 387  * rgb(20%, 30%, 0%)</literallayout></entry>
 388  *       </row>
 389  *       <row>
 390  *         <entry>rgba(@r, @g, @b, @a)</entry>
 391  *         <entry>A translucent color; @r, @g, @b are as in the previous row,
 392  *                @a is a floating point number between 0 and 1</entry>
 393  *         <entry><literallayout>rgba(255, 255, 0, 0.5)</literallayout></entry>
 394  *       </row>
 395  *       <row>
 396  *         <entry>&num;@xxyyzz</entry>
 397  *         <entry>An opaque color; @xx, @yy, @zz are hexadecimal numbers
 398  *                specifying @r, @g, @b variants with between 1 and 4
 399  *                hexadecimal digits per component are allowed</entry>
 400  *         <entry><literallayout>&num;ff12ab
 401  * &num;f0c</literallayout></entry>
 402  *       </row>
 403  *       <row>
 404  *         <entry>&commat;name</entry>
 405  *         <entry>Reference to a color that has been defined with
 406  *                &commat;define-color
 407  *         </entry>
 408  *         <entry>&commat;bg_color</entry>
 409  *       </row>
 410  *       <row>
 411  *         <entry>mix(@color1, @color2, @f)</entry>
 412  *         <entry>A linear combination of @color1 and @color2. @f is a
 413  *                floating point number between 0 and 1.</entry>
 414  *         <entry><literallayout>mix(&num;ff1e0a, &commat;bg_color, 0.8)</literallayout></entry>
 415  *       </row>
 416  *       <row>
 417  *         <entry>shade(@color, @f)</entry>
 418  *         <entry>A lighter or darker variant of @color. @f is a
 419  *                floating point number.
 420  *         </entry>
 421  *         <entry>shade(&commat;fg_color, 0.5)</entry>
 422  *       </row>
 423  *       <row>
 424  *         <entry>lighter(@color)</entry>
 425  *         <entry>A lighter variant of @color</entry>
 426  *       </row>
 427  *       <row>
 428  *         <entry>darker(@color)</entry>
 429  *         <entry>A darker variant of @color</entry>
 430  *       </row>
 431  *     </tbody>
 432  *   </tgroup>
 433  * </informaltable>
 434  * </refsect2>
 435  * <refsect2 id="gtkcssprovider-gradients">
 436  * <title>Gradients</title>
 437  * <para>
 438  * Linear or radial Gradients can be used as background images.
 439  * </para>
 440  * <para>
 441  * A linear gradient along the line from (@start_x, @start_y) to
 442  * (@end_x, @end_y) is specified using the syntax
 443  * <literallayout>-gtk-gradient (linear,
 444  *               @start_x @start_y, @end_x @end_y,
 445  *               color-stop (@position, @color),
 446  *               ...)</literallayout>
 447  * where @start_x and @end_x can be either a floating point number between
 448  * 0 and 1 or one of the special values 'left', 'right' or 'center', @start_y
 449  * and @end_y can be either a floating point number between 0 and 1 or one
 450  * of the special values 'top', 'bottom' or 'center', @position is a floating
 451  * point number between 0 and 1 and @color is a color expression (see above).
 452  * The color-stop can be repeated multiple times to add more than one color
 453  * stop. 'from (@color)' and 'to (@color)' can be used as abbreviations for
 454  * color stops with position 0 and 1, respectively.
 455  * </para>
 456  * <example>
 457  * <title>A linear gradient</title>
 458  * <inlinegraphic fileref="gradient1.png" format="PNG"/>
 459  * <para>This gradient was specified with
 460  * <literallayout>-gtk-gradient (linear,
 461  *                left top, right bottom,
 462  *                from(&commat;yellow), to(&commat;blue))</literallayout></para>
 463  * </example>
 464  * <example>
 465  * <title>Another linear gradient</title>
 466  * <inlinegraphic fileref="gradient2.png" format="PNG"/>
 467  * <para>This gradient was specified with
 468  * <literallayout>-gtk-gradient (linear,
 469  *                0 0, 0 1,
 470  *                color-stop(0, &commat;yellow),
 471  *                color-stop(0.2, &commat;blue),
 472  *                color-stop(1, &num;0f0))</literallayout></para>
 473  * </example>
 474  * <para>
 475  * A radial gradient along the two circles defined by (@start_x, @start_y,
 476  * @start_radius) and (@end_x, @end_y, @end_radius) is specified using the
 477  * syntax
 478  * <literallayout>-gtk-gradient (radial,
 479  *                @start_x @start_y, @start_radius,
 480  *                @end_x @end_y, @end_radius,
 481  *                color-stop (@position, @color),
 482  *                ...)</literallayout>
 483  * where @start_radius and @end_radius are floating point numbers and
 484  * the other parameters are as before.
 485  * </para>
 486  * <example>
 487  * <title>A radial gradient</title>
 488  * <inlinegraphic fileref="gradient3.png" format="PNG"/>
 489  * <para>This gradient was specified with
 490  * <literallayout>-gtk-gradient (radial,
 491  *                center center, 0,
 492  *                center center, 1,
 493  *                from(&commat;yellow), to(&commat;green))</literallayout></para>
 494  * </example>
 495  * <example>
 496  * <title>Another radial gradient</title>
 497  * <inlinegraphic fileref="gradient4.png" format="PNG"/>
 498  * <para>This gradient was specified with
 499  * <literallayout>-gtk-gradient (radial,
 500  *                0.4 0.4, 0.1,
 501  *                0.6 0.6, 0.7,
 502  *                color-stop (0, &num;f00),
 503  *                color-stop (0.1, &num;a0f),
 504  *                color-stop (0.2, &commat;yellow),
 505  *                color-stop (1, &commat;green))</literallayout></para>
 506  * </example>
 507  * </refsect2>
 508  * <refsect2 id="gtkcssprovider-shadows">
 509  * <title>Text shadow</title>
 510  * <para>
 511  * A shadow list can be applied to text or symbolic icons, using the CSS3
 512  * text-shadow syntax, as defined in
 513  * <ulink url="http://www.w3.org/TR/css3-text/#text-shadow">the CSS3 specification</ulink>.
 514  * </para>
 515  * <para>
 516  * A text shadow is specified using the syntax
 517  * <literallayout>text-shadow: @horizontal_offset @vertical_offset [ @blur_radius ] @color</literallayout>
 518  * The offset of the shadow is specified with the @horizontal_offset and @vertical_offset
 519  * parameters. The optional blur radius is parsed, but it is currently not rendered by
 520  * the GTK+ theming engine.
 521  * </para>
 522  * <para>
 523  * To set multiple shadows on an element, you can specify a comma-separated list
 524  * of shadow elements in the text-shadow property. Shadows are always rendered
 525  * front-back, i.e. the first shadow specified is on top of the others. Shadows
 526  * can thus overlay each other, but they can never overlay the text itself,
 527  * which is always rendered on top of the shadow layer.
 528  * </para>
 529  * </refsect2>
 530  * <refsect2 id="gtkcssprovider-slices">
 531  * <title>Border images</title>
 532  * <para>
 533  * Images can be used in 'slices' for the purpose of creating scalable
 534  * borders.
 535  * </para>
 536  * <inlinegraphic fileref="slices.png" format="PNG"/>
 537  * <para>
 538  * The syntax for specifying border images of this kind is:
 539  * <literallayout>url(@path) @top @right @bottom @left [repeat|stretch]? [repeat|stretch]?</literallayout>
 540  * The sizes of the 'cut off' portions are specified
 541  * with the @top, @right, @bottom and @left parameters.
 542  * The 'middle' sections can be repeated or stretched to create
 543  * the desired effect, by adding the 'repeat' or 'stretch' options after
 544  * the dimensions. If two options are specified, the first one affects
 545  * the horizontal behaviour and the second one the vertical behaviour.
 546  * If only one option is specified, it affects both.
 547  * </para>
 548  * <example>
 549  * <title>A border image</title>
 550  * <inlinegraphic fileref="border1.png" format="PNG"/>
 551  * <para>This border image was specified with
 552  * <literallayout>url("gradient1.png") 10 10 10 10</literallayout>
 553  * </para>
 554  * </example>
 555  * <example>
 556  * <title>A repeating border image</title>
 557  * <inlinegraphic fileref="border2.png" format="PNG"/>
 558  * <para>This border image was specified with
 559  * <literallayout>url("gradient1.png") 10 10 10 10 repeat</literallayout>
 560  * </para>
 561  * </example>
 562  * <example>
 563  * <title>A stretched border image</title>
 564  * <inlinegraphic fileref="border3.png" format="PNG"/>
 565  * <para>This border image was specified with
 566  * <literallayout>url("gradient1.png") 10 10 10 10 stretch</literallayout>
 567  * </para>
 568  * </example>
 569  * </refsect2>
 570  * <refsect2 id="gtkcssprovider-transitions">
 571  * <para>Styles can specify transitions that will be used to create a gradual
 572  * change in the appearance when a widget state changes. The following
 573  * syntax is used to specify transitions:
 574  * <literallayout>@duration [s|ms] [linear|ease|ease-in|ease-out|ease-in-out] [loop]?</literallayout>
 575  * The @duration is the amount of time that the animation will take for
 576  * a complete cycle from start to end. If the loop option is given, the
 577  * animation will be repated until the state changes again.
 578  * The option after the duration determines the transition function from a
 579  * small set of predefined functions.
 580  * <figure><title>Linear transition</title>
 581  * <graphic fileref="linear.png" format="PNG"/>
 582  * </figure>
 583  * <figure><title>Ease transition</title>
 584  * <graphic fileref="ease.png" format="PNG"/>
 585  * </figure>
 586  * <figure><title>Ease-in-out transition</title>
 587  * <graphic fileref="ease-in-out.png" format="PNG"/>
 588  * </figure>
 589  * <figure><title>Ease-in transition</title>
 590  * <graphic fileref="ease-in.png" format="PNG"/>
 591  * </figure>
 592  * <figure><title>Ease-out transition</title>
 593  * <graphic fileref="ease-out.png" format="PNG"/>
 594  * </figure>
 595  * </para>
 596  * </refsect2>
 597  * <refsect2 id="gtkcssprovider-properties">
 598  * <title>Supported properties</title>
 599  * <para>
 600  * Properties are the part that differ the most to common CSS,
 601  * not all properties are supported (some are planned to be
 602  * supported eventually, some others are meaningless or don't
 603  * map intuitively in a widget based environment).
 604  * </para>
 605  * <para>
 606  * There is also a difference in shorthand properties, for
 607  * example in common CSS it is fine to define a font through
 608  * the different @font-family, @font-style, @font-size
 609  * properties, meanwhile in GTK+'s CSS only the canonical
 610  * @font property is supported.
 611  * </para>
 612  * <para>
 613  * The currently supported properties are:
 614  * </para>
 615  * <informaltable>
 616  *   <tgroup cols="4">
 617  *     <thead>
 618  *       <row>
 619  *         <entry>Property name</entry>
 620  *         <entry>Syntax</entry>
 621  *         <entry>Maps to</entry>
 622  *         <entry>Examples</entry>
 623  *       </row>
 624  *     </thead>
 625  *     <tbody>
 626  *       <row>
 627  *         <entry>engine</entry>
 628  *         <entry>engine-name</entry>
 629  *         <entry>#GtkThemingEngine</entry>
 630  *         <entry>engine: clearlooks;
 631  *  engine: none; /&ast; use the default (i.e. builtin) engine) &ast;/ </entry>
 632  *       </row>
 633  *       <row>
 634  *         <entry>background-color</entry>
 635  *         <entry morerows="2">color (see above)</entry>
 636  *         <entry morerows="2">#GdkRGBA</entry>
 637  *         <entry morerows="2"><literallayout>background-color: &num;fff;
 638  * color: &amp;color1;
 639  * background-color: shade (&amp;color1, 0.5);
 640  * color: mix (&amp;color1, &num;f0f, 0.8);</literallayout>
 641  *         </entry>
 642  *       </row>
 643  *       <row>
 644  *         <entry>color</entry>
 645  *       </row>
 646  *       <row>
 647  *         <entry>border-color</entry>
 648  *       </row>
 649  *       <row>
 650  *         <entry>font</entry>
 651  *         <entry>@family [@style] [@size]</entry>
 652  *         <entry>#PangoFontDescription</entry>
 653  *         <entry>font: Sans 15;</entry>
 654  *       </row>
 655  *       <row>
 656  *         <entry>margin-top</entry>
 657  *         <entry>integer</entry>
 658  *         <entry>#gint</entry>
 659  *         <entry>margin-top: 0;</entry>
 660  *       </row>
 661  *       <row>
 662  *         <entry>margin-left</entry>
 663  *         <entry>integer</entry>
 664  *         <entry>#gint</entry>
 665  *         <entry>margin-left: 1;</entry>
 666  *       </row>
 667  *       <row>
 668  *         <entry>margin-bottom</entry>
 669  *         <entry>integer</entry>
 670  *         <entry>#gint</entry>
 671  *         <entry>margin-bottom: 2;</entry>
 672  *       </row>
 673  *       <row>
 674  *         <entry>margin-right</entry>
 675  *         <entry>integer</entry>
 676  *         <entry>#gint</entry>
 677  *         <entry>margin-right: 4;</entry>
 678  *       </row>
 679  *       <row>
 680  *         <entry>margin</entry>
 681  *         <entry morerows="1"><literallayout>@width
 682  * @vertical_width @horizontal_width
 683  * @top_width @horizontal_width @bottom_width
 684  * @top_width @right_width @bottom_width @left_width</literallayout>
 685  *         </entry>
 686  *         <entry morerows="1">#GtkBorder</entry>
 687  *         <entry morerows="1"><literallayout>margin: 5;
 688  * margin: 5 10;
 689  * margin: 5 10 3;
 690  * margin: 5 10 3 5;</literallayout>
 691  *         </entry>
 692  *       </row>
 693  *       <row>
 694  *         <entry>padding-top</entry>
 695  *         <entry>integer</entry>
 696  *         <entry>#gint</entry>
 697  *         <entry>padding-top: 5;</entry>
 698  *       </row>
 699  *       <row>
 700  *         <entry>padding-left</entry>
 701  *         <entry>integer</entry>
 702  *         <entry>#gint</entry>
 703  *         <entry>padding-left: 5;</entry>
 704  *       </row>
 705  *       <row>
 706  *         <entry>padding-bottom</entry>
 707  *         <entry>integer</entry>
 708  *         <entry>#gint</entry>
 709  *         <entry>padding-bottom: 5;</entry>
 710  *       </row>
 711  *       <row>
 712  *         <entry>padding-right</entry>
 713  *         <entry>integer</entry>
 714  *         <entry>#gint</entry>
 715  *         <entry>padding-right: 5;</entry>
 716  *       </row>
 717  *       <row>
 718  *         <entry>padding</entry>
 719  *       </row>
 720  *       <row>
 721  *         <entry>background-image</entry>
 722  *         <entry><literallayout>gradient (see above) or
 723  * url(@path)</literallayout></entry>
 724  *         <entry>#cairo_pattern_t</entry>
 725  *         <entry><literallayout>-gtk-gradient (linear,
 726  *                left top, right top,
 727  *                from (&num;fff), to (&num;000));
 728  * -gtk-gradient (linear, 0.0 0.5, 0.5 1.0,
 729  *                from (&num;fff),
 730  *                color-stop (0.5, &num;f00),
 731  *                to (&num;000));
 732  * -gtk-gradient (radial,
 733  *                center center, 0.2,
 734  *                center center, 0.8,
 735  *                color-stop (0.0, &num;fff),
 736  *                color-stop (1.0, &num;000));
 737  * url ('background.png');</literallayout>
 738  *         </entry>
 739  *       </row>
 740  *       <row>
 741  *         <entry>border-top-width</entry>
 742  *         <entry>integer</entry>
 743  *         <entry>#gint</entry>
 744  *         <entry>border-top-width: 5;</entry>
 745  *       </row>
 746  *       <row>
 747  *         <entry>border-left-width</entry>
 748  *         <entry>integer</entry>
 749  *         <entry>#gint</entry>
 750  *         <entry>border-left-width: 5;</entry>
 751  *       </row>
 752  *       <row>
 753  *         <entry>border-bottom-width</entry>
 754  *         <entry>integer</entry>
 755  *         <entry>#gint</entry>
 756  *         <entry>border-bottom-width: 5;</entry>
 757  *       </row>
 758  *       <row>
 759  *         <entry>border-right-width</entry>
 760  *         <entry>integer</entry>
 761  *         <entry>#gint</entry>
 762  *         <entry>border-right-width: 5;</entry>
 763  *       </row>
 764  *       <row>
 765  *         <entry>border-width</entry>
 766  *         <entry morerows="1">#GtkBorder</entry>
 767  *         <entry morerows="1"><literallayout>border-width: 1;
 768  * border-width: 1 2;
 769  * border-width: 1 2 3;
 770  * border-width: 1 2 3 5;</literallayout>
 771  *         </entry>
 772  *       </row>
 773  *       <row>
 774  *         <entry>border-radius</entry>
 775  *         <entry>integer</entry>
 776  *         <entry>#gint</entry>
 777  *         <entry>border-radius: 5;</entry>
 778  *       </row>
 779  *       <row>
 780  *         <entry>border-style</entry>
 781  *         <entry>[none|solid|inset|outset]</entry>
 782  *         <entry>#GtkBorderStyle</entry>
 783  *         <entry>border-style: solid;</entry>
 784  *       </row>
 785  *       <row>
 786  *         <entry>border-image</entry>
 787  *         <entry><literallayout>border image (see above)</literallayout></entry>
 788  *         <entry>internal use only</entry>
 789  *         <entry><literallayout>border-image: url("/path/to/image.png") 3 4 3 4 stretch;
 790  * border-image: url("/path/to/image.png") 3 4 4 3 repeat stretch;</literallayout>
 791  *         </entry>
 792  *       </row>
 793  *       <row>
 794  *         <entry>text-shadow</entry>
 795  *         <entry>shadow list (see above)</entry>
 796  *         <entry>#GtkTextShadow</entry>
 797  *         <entry><literallayout>text-shadow: 1 1 0 blue, -4 -4 red;</literallayout></entry>
 798  *       </row>
 799  *       <row>
 800  *         <entry>transition</entry>
 801  *         <entry>transition (see above)</entry>
 802  *         <entry>internal use only</entry>
 803  *         <entry><literallayout>transition: 150ms ease-in-out;
 804  * transition: 1s linear loop;</literallayout>
 805  *         </entry>
 806  *       </row>
 807  *       <row>
 808  *         <entry>gtk-key-bindings</entry>
 809  *         <entry>binding set name list</entry>
 810  *         <entry>internal use only</entry>
 811  *         <entry><literallayout>gtk-bindings: binding1, binding2, ...;</literallayout>
 812  *         </entry>
 813  *       </row>
 814  *     </tbody>
 815  *   </tgroup>
 816  * </informaltable>
 817  * <para>
 818  * GtkThemingEngines can register their own, engine-specific style properties
 819  * with the function gtk_theming_engine_register_property(). These properties
 820  * can be set in CSS like other properties, using a name of the form
 821  * <literallayout>-<replaceable>namespace</replaceable>-<replaceable>name</replaceable></literallayout>, where <replaceable>namespace</replaceable> is typically
 822  * the name of the theming engine, and <replaceable>name</replaceable> is the
 823  * name of the property. Style properties that have been registered by widgets
 824  * using gtk_widget_class_install_style_property() can also be set in this
 825  * way, using the widget class name for <replaceable>namespace</replaceable>.
 826  * </para>
 827  * <example>
 828  * <title>Using engine-specific style properties</title>
 829  * <programlisting>
 830  * * {
 831  *     engine: clearlooks;
 832  *     border-radius: 4;
 833  *     -GtkPaned-handle-size: 6;
 834  *     -clearlooks-colorize-scrollbar: false;
 835  * }
 836  * </programlisting>
 837  * </example>
 838  * </refsect2>
 839  */
 840
 841 typedef struct GtkCssRuleset GtkCssRuleset;
 842 typedef struct _GtkCssScanner GtkCssScanner;
 843 typedef enum ParserScope ParserScope;
 844 typedef enum ParserSymbol ParserSymbol;
 845
 846 struct GtkCssRuleset
 847 {
 848   GtkCssSelector *selector;
 849   GHashTable *widget_style;
 850   GHashTable *style;
 851
 852   guint has_inherit :1;
 853 };
 854
 855 struct _GtkCssScanner
 856 {
 857   GtkCssProvider *provider;
 858   GtkCssParser *parser;
 859   GtkCssScanner *parent;
 860   GFile *file;
 861   GFile *base;
 862   GSList *state;
 863   GSList *cur_selectors;
 864   GHashTable *cur_properties;
 865 };
 866
 867 struct _GtkCssProviderPrivate
 868 {
 869   GScanner *scanner;
 870
 871   GHashTable *symbolic_colors;
 872
 873   GArray *rulesets;
 874 };
 875
 876 enum ParserScope {
 877   SCOPE_SELECTOR,
 878   SCOPE_PSEUDO_CLASS,
 879   SCOPE_NTH_CHILD,
 880   SCOPE_DECLARATION,
 881   SCOPE_VALUE,
 882   SCOPE_BINDING_SET
 883 };
 884
 885 /* Extend GtkStateType, since these
 886  * values are also used as symbols
 887  */
 888 enum ParserSymbol {
 889   /* Scope: pseudo-class */
 890   SYMBOL_NTH_CHILD = GTK_STATE_FOCUSED + 1,
 891   SYMBOL_FIRST_CHILD,
 892   SYMBOL_LAST_CHILD,
 893   SYMBOL_SORTED_CHILD,
 894
 895   /* Scope: nth-child */
 896   SYMBOL_NTH_CHILD_EVEN,
 897   SYMBOL_NTH_CHILD_ODD,
 898   SYMBOL_NTH_CHILD_FIRST,
 899   SYMBOL_NTH_CHILD_LAST
 900 };
 901
 902 enum {
 903   PARSING_ERROR,
 904   LAST_SIGNAL
 905 };
 906
 907 static guint css_provider_signals[LAST_SIGNAL] = { 0 };
 908
 909 static void gtk_css_provider_finalize (GObject *object);
 910 static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
 911
 912 static gboolean
 913 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
 914                                 GtkCssScanner  *scanner,
 915                                 GFile          *file,
 916                                 const char     *data,
 917                                 gsize           length,
 918                                 GError        **error);
 919
 920 GQuark
 921 gtk_css_provider_error_quark (void)
 922 {
 923   return g_quark_from_static_string ("gtk-css-provider-error-quark");
 924 }
 925
 926 G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
 927                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
 928                                                gtk_css_style_provider_iface_init));
 929
 930 static void
 931 gtk_css_provider_parsing_error (GtkCssProvider  *provider,
 932                                 const gchar     *path,
 933                                 guint            line,
 934                                 guint            position,
 935                                 const GError *   error)
 936 {
 937   /* Only emit a warning when we have no error handlers. This is our
 938    * default handlers. And in this case erroneous CSS files are a bug
 939    * and should be fixed.
 940    * Note that these warnings can also be triggered by a broken theme
 941    * that people installed from some weird location on the internets.
 942    */
 943   if (!g_signal_has_handler_pending (provider,
 944                                      css_provider_signals[PARSING_ERROR],
 945                                      0,
 946                                      TRUE))
 947     {
 948       g_warning ("Theme parsing error: %s:%u:%u: %s", path ? path : "<unknown>", line, position, error->message);
 949     }
 950 }
 951
 952 static void
 953 gtk_css_provider_class_init (GtkCssProviderClass *klass)
 954 {
 955   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 956
 957   /**
 958    * GtkCssProvider::parsing-error:
 959    * @provider: the provider that had a parsing error
 960    * @path: path to the parsed file or %NULL if the file cannot be
 961    *   identified or the data was not loaded from a file
 962    * @line: line in the file or data or 0 if unknown
 963    * @position: offset into the current line or 0 if unknown or the
 964    *   whole line is affected
 965    * @error: The parsing error
 966    *
 967    * Signals that a parsing error occured. the @path, @line and @position
 968    * describe the actual location of the error as accurately as possible.
 969    *
 970    * Parsing errors are never fatal, so the parsing will resume after
 971    * the error. Errors may however cause parts of the given
 972    * data or even all of it to not be parsed at all. So it is a useful idea
 973    * to check that the parsing succeeds by connecting to this signal.
 974    *
 975    * Note that this signal may be emitted at any time as the css provider
 976    * may opt to defer parsing parts or all of the input to a later time
 977    * than when a loading function was called.
 978    */
 979   css_provider_signals[PARSING_ERROR] =
 980     g_signal_new (I_("parsing-error"),
 981                   G_TYPE_FROM_CLASS (object_class),
 982                   G_SIGNAL_RUN_LAST,
 983                   G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
 984                   NULL, NULL,
 985                   _gtk_marshal_VOID__STRING_UINT_UINT_BOXED,
 986                   G_TYPE_NONE, 4,
 987                   G_TYPE_STRING, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_ERROR);
 988
 989   object_class->finalize = gtk_css_provider_finalize;
 990
 991   klass->parsing_error = gtk_css_provider_parsing_error;
 992
 993   g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
 994 }
 995
 996 static void
 997 gtk_css_provider_take_error_full (GtkCssProvider *provider,
 998                                   GFile          *file,
 999                                   guint           line,
1000                                   guint           position,
1001                                   GError         *error)
1002 {
1003   char *filename;
1004
1005   if (file)
1006     filename = g_file_get_path (file);
1007   else
1008     filename = NULL;
1009
1010   g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
1011                  filename, line, position, error);
1012
1013   g_free (filename);
1014   g_error_free (error);
1015 }
1016
1017 static void
1018 gtk_css_ruleset_init_copy (GtkCssRuleset       *new,
1019                            const GtkCssRuleset *ruleset,
1020                            GtkCssSelector      *selector)
1021 {
1022   memcpy (new, ruleset, sizeof (GtkCssRuleset));
1023
1024   new->selector = selector;
1025   if (new->widget_style)
1026     g_hash_table_ref (new->widget_style);
1027   if (new->style)
1028     g_hash_table_ref (new->style);
1029 }
1030
1031 static void
1032 gtk_css_ruleset_clear (GtkCssRuleset *ruleset)
1033 {
1034   if (ruleset->style)
1035     g_hash_table_unref (ruleset->style);
1036   if (ruleset->widget_style)
1037     g_hash_table_unref (ruleset->widget_style);
1038   if (ruleset->selector)
1039     _gtk_css_selector_free (ruleset->selector);
1040
1041   memset (ruleset, 0, sizeof (GtkCssRuleset));
1042 }
1043
1044 static void
1045 property_value_free (GValue *value)
1046 {
1047   if (G_IS_VALUE (value))
1048     g_value_unset (value);
1049
1050   g_slice_free (GValue, value);
1051 }
1052
1053 static void
1054 gtk_css_ruleset_add_style (GtkCssRuleset *ruleset,
1055                            char          *name,
1056                            GValue        *value)
1057 {
1058   if (ruleset->widget_style == NULL)
1059     ruleset->widget_style = g_hash_table_new_full (g_str_hash,
1060                                                    g_str_equal,
1061                                                    (GDestroyNotify) g_free,
1062                                                    (GDestroyNotify) property_value_free);
1063
1064   g_hash_table_insert (ruleset->widget_style, name, value);
1065 }
1066
1067 static void
1068 gtk_css_ruleset_add (GtkCssRuleset          *ruleset,
1069                      const GtkStyleProperty *prop,
1070                      GValue                 *value)
1071 {
1072   if (ruleset->style == NULL)
1073     ruleset->style = g_hash_table_new_full (g_direct_hash,
1074                                             g_direct_equal,
1075                                             NULL,
1076                                             (GDestroyNotify) property_value_free);
1077
1078   if (_gtk_style_property_is_shorthand (prop))
1079     {
1080       GParameter *parameters;
1081       guint i, n_parameters;
1082
1083       parameters = _gtk_style_property_unpack (prop, value, &n_parameters);
1084
1085       for (i = 0; i < n_parameters; i++)
1086         {
1087           const GtkStyleProperty *child;
1088           GValue *value;
1089
1090           child = _gtk_style_property_lookup (parameters[i].name);
1091           value = g_slice_dup (GValue, &parameters[i].value);
1092           gtk_css_ruleset_add (ruleset, child, value);
1093         }
1094       g_free (parameters);
1095       property_value_free (value);
1096       return;
1097     }
1098
1099   ruleset->has_inherit |= _gtk_style_property_is_inherit (prop);
1100   g_hash_table_insert (ruleset->style, (gpointer) prop, value);
1101 }
1102
1103 static gboolean
1104 gtk_css_ruleset_matches (GtkCssRuleset *ruleset,
1105                          GtkWidgetPath *path,
1106                          guint          length)
1107 {
1108   return _gtk_css_selector_matches (ruleset->selector, path, length);
1109 }
1110
1111 static void
1112 gtk_css_scanner_reset (GtkCssScanner *scanner)
1113 {
1114   g_slist_free (scanner->state);
1115   scanner->state = NULL;
1116
1117   g_slist_free_full (scanner->cur_selectors, (GDestroyNotify) _gtk_css_selector_free);
1118   scanner->cur_selectors = NULL;
1119
1120   if (scanner->cur_properties)
1121     g_hash_table_unref (scanner->cur_properties);
1122
1123   scanner ->cur_properties = g_hash_table_new_full (g_str_hash,
1124                                                     g_str_equal,
1125                                                     (GDestroyNotify) g_free,
1126                                                     (GDestroyNotify) property_value_free);
1127 }
1128
1129 static void
1130 gtk_css_scanner_destroy (GtkCssScanner *scanner)
1131 {
1132   gtk_css_scanner_reset (scanner);
1133
1134   g_object_unref (scanner->provider);
1135   if (scanner->file)
1136     g_object_unref (scanner->file);
1137   g_object_unref (scanner->base);
1138   g_hash_table_destroy (scanner->cur_properties);
1139   _gtk_css_parser_free (scanner->parser);
1140
1141   g_slice_free (GtkCssScanner, scanner);
1142 }
1143
1144 static void
1145 gtk_css_scanner_parser_error (GtkCssParser *parser,
1146                               const GError *error,
1147                               gpointer      user_data)
1148 {
1149   GtkCssScanner *scanner = user_data;
1150
1151   gtk_css_provider_take_error_full (scanner->provider,
1152                                     scanner->file,
1153                                     _gtk_css_parser_get_line (scanner->parser),
1154                                     _gtk_css_parser_get_position (scanner->parser),
1155                                     g_error_copy (error));
1156 }
1157
1158 static GtkCssScanner *
1159 gtk_css_scanner_new (GtkCssProvider *provider,
1160                      GtkCssScanner  *parent,
1161                      GFile          *file,
1162                      const gchar    *data,
1163                      gsize           length)
1164 {
1165   GtkCssScanner *scanner;
1166
1167   g_assert (data[length] == 0);
1168
1169   scanner = g_slice_new0 (GtkCssScanner);
1170
1171   g_object_ref (provider);
1172   scanner->provider = provider;
1173   scanner->parent = parent;
1174
1175   if (file)
1176     {
1177       scanner->file = g_object_ref (file);
1178       scanner->base = g_file_get_parent (file);
1179     }
1180   else
1181     {
1182       char *dir = g_get_current_dir ();
1183       scanner->base = g_file_new_for_path (dir);
1184       g_free (dir);
1185     }
1186
1187   scanner->cur_properties = g_hash_table_new_full (g_str_hash,
1188                                                    g_str_equal,
1189                                                    (GDestroyNotify) g_free,
1190                                                    (GDestroyNotify) property_value_free);
1191
1192   scanner->parser = _gtk_css_parser_new (data,
1193                                          gtk_css_scanner_parser_error,
1194                                          scanner);
1195
1196   return scanner;
1197 }
1198
1199 static GFile *
1200 gtk_css_scanner_get_base_url (GtkCssScanner *scanner)
1201 {
1202   return scanner->base;
1203 }
1204
1205 static gboolean
1206 gtk_css_scanner_would_recurse (GtkCssScanner *scanner,
1207                                GFile         *file)
1208 {
1209   while (scanner)
1210     {
1211       if (scanner->file && g_file_equal (scanner->file, file))
1212         return TRUE;
1213
1214       scanner = scanner->parent;
1215     }
1216
1217   return FALSE;
1218 }
1219
1220 static void
1221 gtk_css_provider_init (GtkCssProvider *css_provider)
1222 {
1223   GtkCssProviderPrivate *priv;
1224
1225   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1226                                                            GTK_TYPE_CSS_PROVIDER,
1227                                                            GtkCssProviderPrivate);
1228
1229   priv->rulesets = g_array_new (FALSE, FALSE, sizeof (GtkCssRuleset));
1230
1231   priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
1232                                                  (GDestroyNotify) g_free,
1233                                                  (GDestroyNotify) gtk_symbolic_color_unref);
1234 }
1235
1236 static void
1237 css_provider_dump_symbolic_colors (GtkCssProvider     *css_provider,
1238                                    GtkStyleProperties *props)
1239 {
1240   GtkCssProviderPrivate *priv;
1241   GHashTableIter iter;
1242   gpointer key, value;
1243
1244   priv = css_provider->priv;
1245   g_hash_table_iter_init (&iter, priv->symbolic_colors);
1246
1247   while (g_hash_table_iter_next (&iter, &key, &value))
1248     {
1249       const gchar *name;
1250       GtkSymbolicColor *color;
1251
1252       name = key;
1253       color = value;
1254
1255       gtk_style_properties_map_color (props, name, color);
1256     }
1257 }
1258
1259 static GtkStyleProperties *
1260 gtk_css_provider_get_style (GtkStyleProvider *provider,
1261                             GtkWidgetPath    *path)
1262 {
1263   GtkCssProvider *css_provider;
1264   GtkCssProviderPrivate *priv;
1265   GtkStyleProperties *props;
1266   guint i, l, length;
1267
1268   css_provider = GTK_CSS_PROVIDER (provider);
1269   priv = css_provider->priv;
1270   length = gtk_widget_path_length (path);
1271   props = gtk_style_properties_new ();
1272
1273   css_provider_dump_symbolic_colors (css_provider, props);
1274
1275   for (l = 1; l <= length; l++)
1276     {
1277       for (i = 0; i < priv->rulesets->len; i++)
1278         {
1279           GtkCssRuleset *ruleset;
1280           GHashTableIter iter;
1281           gpointer key, value;
1282
1283           ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1284
1285           if (ruleset->style == NULL)
1286             continue;
1287
1288           if (l < length && (!ruleset->has_inherit || _gtk_css_selector_get_state_flags (ruleset->selector)))
1289             continue;
1290
1291           if (!gtk_css_ruleset_matches (ruleset, path, l))
1292             continue;
1293
1294           g_hash_table_iter_init (&iter, ruleset->style);
1295
1296           while (g_hash_table_iter_next (&iter, &key, &value))
1297             {
1298               GtkStyleProperty *prop = key;
1299
1300               if (l != length && !_gtk_style_property_is_inherit (prop))
1301                 continue;
1302
1303               _gtk_style_properties_set_property_by_property (props,
1304                                                               prop,
1305                                                               _gtk_css_selector_get_state_flags (ruleset->selector),
1306                                                               value);
1307             }
1308         }
1309     }
1310
1311   return props;
1312 }
1313
1314 static void
1315 gtk_css_provider_parser_error (GtkCssParser *parser,
1316                                const GError *error,
1317                                gpointer      user_data)
1318 {
1319   GtkCssProvider *provider = user_data;
1320
1321   gtk_css_provider_take_error_full (provider,
1322                                     NULL,
1323                                     _gtk_css_parser_get_line (parser),
1324                                     _gtk_css_parser_get_position (parser),
1325                                     g_error_copy (error));
1326 }
1327
1328 static gboolean
1329 gtk_css_provider_get_style_property (GtkStyleProvider *provider,
1330                                      GtkWidgetPath    *path,
1331                                      GtkStateFlags     state,
1332                                      GParamSpec       *pspec,
1333                                      GValue           *value)
1334 {
1335   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1336   GtkCssProviderPrivate *priv = css_provider->priv;
1337   const GValue *val;
1338   gboolean found = FALSE;
1339   gchar *prop_name;
1340   gint i;
1341
1342   prop_name = g_strdup_printf ("-%s-%s",
1343                                g_type_name (pspec->owner_type),
1344                                pspec->name);
1345
1346   for (i = priv->rulesets->len - 1; i >= 0; i--)
1347     {
1348       GtkCssRuleset *ruleset;
1349       GtkStateFlags selector_state;
1350
1351       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1352
1353       if (ruleset->widget_style == NULL)
1354         continue;
1355
1356       if (!gtk_css_ruleset_matches (ruleset, path, gtk_widget_path_length (path)))
1357         continue;
1358
1359       selector_state = _gtk_css_selector_get_state_flags (ruleset->selector);
1360       val = g_hash_table_lookup (ruleset->widget_style, prop_name);
1361
1362       if (val &&
1363           (selector_state == 0 ||
1364            selector_state == state ||
1365            ((selector_state & state) != 0 &&
1366             (selector_state & ~(state)) == 0)))
1367         {
1368           GtkCssParser *parser;
1369
1370           parser = _gtk_css_parser_new (g_value_get_string (val),
1371                                         gtk_css_provider_parser_error,
1372                                         provider);
1373
1374           found = _gtk_style_property_parse_value (NULL,
1375                                                    value,
1376                                                    parser,
1377                                                    NULL);
1378
1379           _gtk_css_parser_free (parser);
1380
1381           if (found)
1382             break;
1383         }
1384     }
1385
1386   g_free (prop_name);
1387
1388   return found;
1389 }
1390
1391 static void
1392 gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
1393 {
1394   iface->get_style = gtk_css_provider_get_style;
1395   iface->get_style_property = gtk_css_provider_get_style_property;
1396 }
1397
1398 static void
1399 gtk_css_provider_finalize (GObject *object)
1400 {
1401   GtkCssProvider *css_provider;
1402   GtkCssProviderPrivate *priv;
1403   guint i;
1404
1405   css_provider = GTK_CSS_PROVIDER (object);
1406   priv = css_provider->priv;
1407
1408   for (i = 0; i < priv->rulesets->len; i++)
1409     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1410
1411   g_array_free (priv->rulesets, TRUE);
1412
1413   if (priv->symbolic_colors)
1414     g_hash_table_destroy (priv->symbolic_colors);
1415
1416   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1417 }
1418
1419 /**
1420  * gtk_css_provider_new:
1421  *
1422  * Returns a newly created #GtkCssProvider.
1423  *
1424  * Returns: A new #GtkCssProvider
1425  **/
1426 GtkCssProvider *
1427 gtk_css_provider_new (void)
1428 {
1429   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1430 }
1431
1432 static void
1433 gtk_css_provider_take_error (GtkCssProvider *provider,
1434                              GtkCssScanner  *scanner,
1435                              GError         *error)
1436 {
1437   gtk_css_provider_take_error_full (provider,
1438                                     scanner->file,
1439                                     _gtk_css_parser_get_line (scanner->parser),
1440                                     _gtk_css_parser_get_position (scanner->parser),
1441                                     error);
1442 }
1443
1444 static void
1445 gtk_css_provider_error_literal (GtkCssProvider *provider,
1446                                 GtkCssScanner  *scanner,
1447                                 GQuark          domain,
1448                                 gint            code,
1449                                 const char     *message)
1450 {
1451   gtk_css_provider_take_error (provider,
1452                                scanner,
1453                                g_error_new_literal (domain, code, message));
1454 }
1455
1456 static void
1457 gtk_css_provider_error (GtkCssProvider *provider,
1458                         GtkCssScanner  *scanner,
1459                         GQuark          domain,
1460                         gint            code,
1461                         const char     *format,
1462                         ...)  G_GNUC_PRINTF (5, 6);
1463 static void
1464 gtk_css_provider_error (GtkCssProvider *provider,
1465                         GtkCssScanner  *scanner,
1466                         GQuark          domain,
1467                         gint            code,
1468                         const char     *format,
1469                         ...)
1470 {
1471   GError *error;
1472   va_list args;
1473
1474   va_start (args, format);
1475   error = g_error_new_valist (domain, code, format, args);
1476   va_end (args);
1477
1478   gtk_css_provider_take_error (provider, scanner, error);
1479 }
1480
1481 static void
1482 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1483                                 GtkCssScanner  *scanner,
1484                                 const char     *expected)
1485 {
1486   gtk_css_provider_error (provider,
1487                           scanner,
1488                           GTK_CSS_PROVIDER_ERROR,
1489                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1490                           "expected a valid %s", expected);
1491 }
1492
1493 static void
1494 css_provider_commit (GtkCssProvider *css_provider,
1495                      GSList         *selectors,
1496                      GtkCssRuleset  *ruleset)
1497 {
1498   GtkCssProviderPrivate *priv;
1499   GSList *l;
1500
1501   priv = css_provider->priv;
1502
1503   if (ruleset->style == NULL && ruleset->widget_style == NULL)
1504     {
1505       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
1506       return;
1507     }
1508
1509   for (l = selectors; l; l = l->next)
1510     {
1511       GtkCssRuleset new;
1512
1513       gtk_css_ruleset_init_copy (&new, ruleset, l->data);
1514
1515       g_array_append_val (priv->rulesets, new);
1516     }
1517
1518   g_slist_free (selectors);
1519 }
1520
1521 static void
1522 gtk_css_provider_reset (GtkCssProvider *css_provider)
1523 {
1524   GtkCssProviderPrivate *priv;
1525   guint i;
1526
1527   priv = css_provider->priv;
1528
1529   g_hash_table_remove_all (priv->symbolic_colors);
1530
1531   for (i = 0; i < priv->rulesets->len; i++)
1532     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1533   g_array_set_size (priv->rulesets, 0);
1534 }
1535
1536 static void
1537 gtk_css_provider_propagate_error (GtkCssProvider  *provider,
1538                                   const gchar     *path,
1539                                   guint            line,
1540                                   guint            position,
1541                                   const GError    *error,
1542                                   GError         **propagate_to)
1543 {
1544   /* don't fail for deprecations */
1545   if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
1546     {
1547       g_warning ("Theme parsing error: %s:%u:%u: %s", path ? path : "<unknown>", line, position, error->message);
1548       return;
1549     }
1550
1551   /* we already set an error. And we'd like to keep the first one */
1552   if (*propagate_to)
1553     return;
1554
1555   *propagate_to = g_error_copy (error);
1556   g_prefix_error (propagate_to, "%s:%u:%u: ", path ? path : "<unknown>", line, position);
1557 }
1558
1559 static void
1560 parse_import (GtkCssScanner *scanner)
1561 {
1562   GFile *file;
1563   char *uri;
1564
1565   uri = _gtk_css_parser_read_uri (scanner->parser);
1566   if (uri == NULL)
1567     {
1568       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1569       return;
1570     }
1571
1572   file = g_file_resolve_relative_path (gtk_css_scanner_get_base_url (scanner), uri);
1573   g_free (uri);
1574
1575   if (gtk_css_scanner_would_recurse (scanner, file))
1576     {
1577        char *path = g_file_get_path (file);
1578        gtk_css_provider_error (scanner->provider,
1579                                scanner,
1580                                GTK_CSS_PROVIDER_ERROR,
1581                                GTK_CSS_PROVIDER_ERROR_IMPORT,
1582                                "Loading '%s' would recurse",
1583                                path);
1584        g_free (path);
1585     }
1586   else
1587     {
1588       gtk_css_provider_load_internal (scanner->provider,
1589                                       scanner,
1590                                       file,
1591                                       NULL, 0,
1592                                       NULL);
1593     }
1594
1595   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1596     {
1597       g_object_unref (file);
1598       gtk_css_provider_invalid_token (scanner->provider, scanner, "semicolon");
1599       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1600       return;
1601     }
1602
1603   g_object_unref (file);
1604 }
1605
1606 static void
1607 parse_color_definition (GtkCssScanner *scanner)
1608 {
1609   GtkSymbolicColor *symbolic;
1610   char *name;
1611
1612   name = _gtk_css_parser_try_name (scanner->parser, TRUE);
1613   if (name == NULL)
1614     {
1615       gtk_css_provider_error_literal (scanner->provider,
1616                                       scanner,
1617                                       GTK_CSS_PROVIDER_ERROR,
1618                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1619                                       "Not a valid color name");
1620       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1621       return;
1622     }
1623
1624   symbolic = _gtk_css_parser_read_symbolic_color (scanner->parser);
1625   if (symbolic == NULL)
1626     {
1627       g_free (name);
1628       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1629       return;
1630     }
1631
1632   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1633     {
1634       g_free (name);
1635       gtk_symbolic_color_unref (symbolic);
1636       gtk_css_provider_error_literal (scanner->provider,
1637                                       scanner,
1638                                       GTK_CSS_PROVIDER_ERROR,
1639                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1640                                       "Missing semicolon at end of color definition");
1641       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1642       return;
1643     }
1644
1645   g_hash_table_insert (scanner->provider->priv->symbolic_colors, name, symbolic);
1646 }
1647
1648 static void
1649 parse_binding_set (GtkCssScanner *scanner)
1650 {
1651   GtkBindingSet *binding_set;
1652   char *name;
1653
1654   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1655   if (name == NULL)
1656     {
1657       gtk_css_provider_error_literal (scanner->provider,
1658                                       scanner,
1659                                       GTK_CSS_PROVIDER_ERROR,
1660                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1661                                       "Expected name for binding set");
1662       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1663       goto skip_semicolon;
1664     }
1665
1666   binding_set = gtk_binding_set_find (name);
1667   if (!binding_set)
1668     {
1669       binding_set = gtk_binding_set_new (name);
1670       binding_set->parsed = TRUE;
1671     }
1672   g_free (name);
1673
1674   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
1675     {
1676       gtk_css_provider_error_literal (scanner->provider,
1677                                       scanner,
1678                                       GTK_CSS_PROVIDER_ERROR,
1679                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1680                                       "Expected '{' for binding set");
1681       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1682       goto skip_semicolon;
1683     }
1684
1685   while (!_gtk_css_parser_is_eof (scanner->parser) &&
1686          !_gtk_css_parser_begins_with (scanner->parser, '}'))
1687     {
1688       name = _gtk_css_parser_read_value (scanner->parser);
1689       if (name == NULL)
1690         {
1691           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1692           continue;
1693         }
1694
1695       gtk_binding_entry_add_signal_from_string (binding_set, name);
1696       g_free (name);
1697
1698       if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1699         {
1700           if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
1701               !_gtk_css_parser_is_eof (scanner->parser))
1702             {
1703               gtk_css_provider_error_literal (scanner->provider,
1704                                               scanner,
1705                                               GTK_CSS_PROVIDER_ERROR,
1706                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
1707                                               "Expected semicolon");
1708               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1709             }
1710         }
1711     }
1712
1713   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
1714     {
1715       gtk_css_provider_error_literal (scanner->provider,
1716                                       scanner,
1717                                       GTK_CSS_PROVIDER_ERROR,
1718                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1719                                       "expected '}' after declarations");
1720       if (!_gtk_css_parser_is_eof (scanner->parser))
1721         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
1722     }
1723
1724 skip_semicolon:
1725   if (_gtk_css_parser_try (scanner->parser, ";", TRUE))
1726     gtk_css_provider_error_literal (scanner->provider,
1727                                     scanner,
1728                                     GTK_CSS_PROVIDER_ERROR,
1729                                     GTK_CSS_PROVIDER_ERROR_DEPRECATED,
1730                                     "Nonstandard semicolon at end of binding set");
1731 }
1732
1733 static void
1734 parse_at_keyword (GtkCssScanner *scanner)
1735 {
1736   if (_gtk_css_parser_try (scanner->parser, "@import", TRUE))
1737     parse_import (scanner);
1738   else if (_gtk_css_parser_try (scanner->parser, "@define-color", TRUE))
1739     parse_color_definition (scanner);
1740   else if (_gtk_css_parser_try (scanner->parser, "@binding-set", TRUE))
1741     parse_binding_set (scanner);
1742   else
1743     {
1744       gtk_css_provider_error_literal (scanner->provider,
1745                                       scanner,
1746                                       GTK_CSS_PROVIDER_ERROR,
1747                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1748                                       "unknown @ rule");
1749       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1750     }
1751 }
1752
1753 static gboolean
1754 parse_selector_class (GtkCssScanner *scanner, GArray *classes)
1755 {
1756   GQuark qname;
1757   char *name;
1758
1759   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
1760
1761   if (name == NULL)
1762     {
1763       gtk_css_provider_error_literal (scanner->provider,
1764                                       scanner,
1765                                       GTK_CSS_PROVIDER_ERROR,
1766                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1767                                       "Expected a valid name for class");
1768       return FALSE;
1769     }
1770
1771   qname = g_quark_from_string (name);
1772   g_array_append_val (classes, qname);
1773   g_free (name);
1774   return TRUE;
1775 }
1776
1777 static gboolean
1778 parse_selector_name (GtkCssScanner *scanner, GArray *names)
1779 {
1780   GQuark qname;
1781   char *name;
1782
1783   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
1784
1785   if (name == NULL)
1786     {
1787       gtk_css_provider_error_literal (scanner->provider,
1788                                       scanner,
1789                                       GTK_CSS_PROVIDER_ERROR,
1790                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1791                                       "Expected a valid name for id");
1792       return FALSE;
1793     }
1794
1795   qname = g_quark_from_string (name);
1796   g_array_append_val (names, qname);
1797   g_free (name);
1798   return TRUE;
1799 }
1800
1801 static gboolean
1802 parse_selector_pseudo_class (GtkCssScanner  *scanner,
1803                              GtkRegionFlags *region_to_modify,
1804                              GtkStateFlags  *state_to_modify)
1805 {
1806   struct {
1807     const char *name;
1808     GtkRegionFlags region_flag;
1809     GtkStateFlags state_flag;
1810   } pseudo_classes[] = {
1811     { "first",        GTK_REGION_FIRST, 0 },
1812     { "last",         GTK_REGION_LAST, 0 },
1813     { "sorted",       GTK_REGION_SORTED, 0 },
1814     { "active",       0, GTK_STATE_FLAG_ACTIVE },
1815     { "prelight",     0, GTK_STATE_FLAG_PRELIGHT },
1816     { "hover",        0, GTK_STATE_FLAG_PRELIGHT },
1817     { "selected",     0, GTK_STATE_FLAG_SELECTED },
1818     { "insensitive",  0, GTK_STATE_FLAG_INSENSITIVE },
1819     { "inconsistent", 0, GTK_STATE_FLAG_INCONSISTENT },
1820     { "focused",      0, GTK_STATE_FLAG_FOCUSED },
1821     { "focus",        0, GTK_STATE_FLAG_FOCUSED },
1822     { NULL, }
1823   }, nth_child_classes[] = {
1824     { "first",        GTK_REGION_FIRST, 0 },
1825     { "last",         GTK_REGION_LAST, 0 },
1826     { "even",         GTK_REGION_EVEN, 0 },
1827     { "odd",          GTK_REGION_ODD, 0 },
1828     { NULL, }
1829   }, *classes;
1830   guint i;
1831   char *name;
1832
1833   name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
1834   if (name == NULL)
1835     {
1836       gtk_css_provider_error_literal (scanner->provider,
1837                                       scanner,
1838                                       GTK_CSS_PROVIDER_ERROR,
1839                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1840                                       "Missing name of pseudo-class");
1841       return FALSE;
1842     }
1843
1844   if (_gtk_css_parser_try (scanner->parser, "(", TRUE))
1845     {
1846       char *function = name;
1847
1848       name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1849       if (!_gtk_css_parser_try (scanner->parser, ")", FALSE))
1850         {
1851           gtk_css_provider_error_literal (scanner->provider,
1852                                           scanner,
1853                                           GTK_CSS_PROVIDER_ERROR,
1854                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1855                                           "Missing closing bracket for pseudo-class");
1856           return FALSE;
1857         }
1858
1859       if (g_ascii_strcasecmp (function, "nth-child") != 0)
1860         {
1861           gtk_css_provider_error (scanner->provider,
1862                                   scanner,
1863                                   GTK_CSS_PROVIDER_ERROR,
1864                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
1865                                   "Unknown pseudo-class '%s(%s)'", function, name ? name : "");
1866           g_free (function);
1867           g_free (name);
1868           return FALSE;
1869         }
1870
1871       g_free (function);
1872
1873       if (name == NULL)
1874         {
1875           gtk_css_provider_error (scanner->provider,
1876                                   scanner,
1877                                   GTK_CSS_PROVIDER_ERROR,
1878                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
1879                                   "nth-child() requires an argument");
1880           return FALSE;
1881         }
1882
1883       classes = nth_child_classes;
1884     }
1885   else
1886     classes = pseudo_classes;
1887
1888   for (i = 0; classes[i].name != NULL; i++)
1889     {
1890       if (g_ascii_strcasecmp (name, classes[i].name) == 0)
1891         {
1892           if ((*region_to_modify & classes[i].region_flag) ||
1893               (*state_to_modify & classes[i].state_flag))
1894             {
1895               if (classes == nth_child_classes)
1896                 gtk_css_provider_error (scanner->provider,
1897                                         scanner,
1898                                         GTK_CSS_PROVIDER_ERROR,
1899                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
1900                                         "Duplicate pseudo-class 'nth-child(%s)'", name);
1901               else
1902                 gtk_css_provider_error (scanner->provider,
1903                                         scanner,
1904                                         GTK_CSS_PROVIDER_ERROR,
1905                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
1906                                         "Duplicate pseudo-class '%s'", name);
1907             }
1908           *region_to_modify |= classes[i].region_flag;
1909           *state_to_modify |= classes[i].state_flag;
1910
1911           g_free (name);
1912           return TRUE;
1913         }
1914     }
1915
1916   if (classes == nth_child_classes)
1917     gtk_css_provider_error (scanner->provider,
1918                             scanner,
1919                             GTK_CSS_PROVIDER_ERROR,
1920                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
1921                             "Unknown pseudo-class 'nth-child(%s)'", name);
1922   else
1923     gtk_css_provider_error (scanner->provider,
1924                             scanner,
1925                             GTK_CSS_PROVIDER_ERROR,
1926                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
1927                             "Unknown pseudo-class '%s'", name);
1928   g_free (name);
1929   return FALSE;
1930 }
1931
1932 static gboolean
1933 parse_simple_selector (GtkCssScanner *scanner,
1934                        char **name,
1935                        GArray *ids,
1936                        GArray *classes,
1937                        GtkRegionFlags *pseudo_classes,
1938                        GtkStateFlags *state)
1939 {
1940   gboolean parsed_something;
1941
1942   *name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
1943   if (*name)
1944     parsed_something = TRUE;
1945   else
1946     parsed_something = _gtk_css_parser_try (scanner->parser, "*", FALSE);
1947
1948   do {
1949       if (_gtk_css_parser_try (scanner->parser, "#", FALSE))
1950         {
1951           if (!parse_selector_name (scanner, ids))
1952             return FALSE;
1953         }
1954       else if (_gtk_css_parser_try (scanner->parser, ".", FALSE))
1955         {
1956           if (!parse_selector_class (scanner, classes))
1957             return FALSE;
1958         }
1959       else if (_gtk_css_parser_try (scanner->parser, ":", FALSE))
1960         {
1961           if (!parse_selector_pseudo_class (scanner, pseudo_classes, state))
1962             return FALSE;
1963         }
1964       else if (!parsed_something)
1965         {
1966           gtk_css_provider_error_literal (scanner->provider,
1967                                           scanner,
1968                                           GTK_CSS_PROVIDER_ERROR,
1969                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1970                                           "Expected a valid selector");
1971           return FALSE;
1972         }
1973       else
1974         break;
1975
1976       parsed_something = TRUE;
1977     }
1978   while (!_gtk_css_parser_is_eof (scanner->parser));
1979
1980   _gtk_css_parser_skip_whitespace (scanner->parser);
1981   return TRUE;
1982 }
1983
1984 static GtkCssSelector *
1985 parse_selector (GtkCssScanner *scanner)
1986 {
1987   GtkCssSelector *selector = NULL;
1988
1989   do {
1990       char *name = NULL;
1991       GArray *ids = g_array_new (TRUE, FALSE, sizeof (GQuark));
1992       GArray *classes = g_array_new (TRUE, FALSE, sizeof (GQuark));
1993       GtkRegionFlags pseudo_classes = 0;
1994       GtkStateFlags state = 0;
1995       GtkCssCombinator combine = GTK_CSS_COMBINE_DESCANDANT;
1996
1997       if (selector)
1998         {
1999           if (_gtk_css_parser_try (scanner->parser, ">", TRUE))
2000             combine = GTK_CSS_COMBINE_CHILD;
2001         }
2002
2003       if (!parse_simple_selector (scanner, &name, ids, classes, &pseudo_classes, &state))
2004         {
2005           g_array_free (ids, TRUE);
2006           g_array_free (classes, TRUE);
2007           if (selector)
2008             _gtk_css_selector_free (selector);
2009           return NULL;
2010         }
2011
2012       selector = _gtk_css_selector_new (selector,
2013                                         combine,
2014                                         name,
2015                                         (GQuark *) g_array_free (ids, ids->len == 0),
2016                                         (GQuark *) g_array_free (classes, classes->len == 0),
2017                                         pseudo_classes,
2018                                         state);
2019       g_free (name);
2020     }
2021   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2022          !_gtk_css_parser_begins_with (scanner->parser, ',') &&
2023          !_gtk_css_parser_begins_with (scanner->parser, '{'));
2024
2025   return selector;
2026 }
2027
2028 static GSList *
2029 parse_selector_list (GtkCssScanner *scanner)
2030 {
2031   GSList *selectors = NULL;
2032
2033   do {
2034       GtkCssSelector *select = parse_selector (scanner);
2035
2036       if (select == NULL)
2037         {
2038           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2039           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2040           return NULL;
2041         }
2042
2043       selectors = g_slist_prepend (selectors, select);
2044     }
2045   while (_gtk_css_parser_try (scanner->parser, ",", TRUE));
2046
2047   return selectors;
2048 }
2049
2050 static void
2051 parse_declaration (GtkCssScanner *scanner,
2052                    GtkCssRuleset *ruleset)
2053 {
2054   const GtkStyleProperty *property;
2055   char *name;
2056
2057   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2058   if (name == NULL)
2059     goto check_for_semicolon;
2060
2061   property = _gtk_style_property_lookup (name);
2062   if (property == NULL && name[0] != '-')
2063     {
2064       gtk_css_provider_error (scanner->provider,
2065                               scanner,
2066                               GTK_CSS_PROVIDER_ERROR,
2067                               GTK_CSS_PROVIDER_ERROR_NAME,
2068                               "'%s' is not a valid property name",
2069                               name);
2070       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2071       g_free (name);
2072       return;
2073     }
2074
2075   if (!_gtk_css_parser_try (scanner->parser, ":", TRUE))
2076     {
2077       gtk_css_provider_invalid_token (scanner->provider, scanner, "':'");
2078       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2079       g_free (name);
2080       return;
2081     }
2082
2083   if (property)
2084     {
2085       GValue *val;
2086
2087       g_free (name);
2088
2089       val = g_slice_new0 (GValue);
2090       g_value_init (val, property->pspec->value_type);
2091
2092       if (_gtk_style_property_parse_value (property,
2093                                            val,
2094                                            scanner->parser,
2095                                            gtk_css_scanner_get_base_url (scanner)))
2096         {
2097           if (_gtk_css_parser_begins_with (scanner->parser, ';') ||
2098               _gtk_css_parser_begins_with (scanner->parser, '}') ||
2099               _gtk_css_parser_is_eof (scanner->parser))
2100             {
2101               gtk_css_ruleset_add (ruleset, property, val);
2102             }
2103           else
2104             {
2105               gtk_css_provider_error_literal (scanner->provider,
2106                                               scanner,
2107                                               GTK_CSS_PROVIDER_ERROR,
2108                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
2109                                               "Junk at end of value");
2110               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2111               g_value_unset (val);
2112               g_slice_free (GValue, val);
2113               return;
2114             }
2115         }
2116       else
2117         {
2118           g_value_unset (val);
2119           g_slice_free (GValue, val);
2120           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2121           return;
2122         }
2123     }
2124   else if (name[0] == '-')
2125     {
2126       char *value_str;
2127
2128       value_str = _gtk_css_parser_read_value (scanner->parser);
2129       if (value_str)
2130         {
2131           GValue *val;
2132
2133           val = g_slice_new0 (GValue);
2134           g_value_init (val, G_TYPE_STRING);
2135           g_value_take_string (val, value_str);
2136
2137           gtk_css_ruleset_add_style (ruleset, name, val);
2138         }
2139       else
2140         {
2141           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2142           return;
2143         }
2144     }
2145   else
2146     g_free (name);
2147
2148 check_for_semicolon:
2149   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2150     {
2151       if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2152           !_gtk_css_parser_is_eof (scanner->parser))
2153         {
2154           gtk_css_provider_error_literal (scanner->provider,
2155                                           scanner,
2156                                           GTK_CSS_PROVIDER_ERROR,
2157                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2158                                           "Expected semicolon");
2159           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2160         }
2161     }
2162 }
2163
2164 static void
2165 parse_declarations (GtkCssScanner *scanner,
2166                     GtkCssRuleset *ruleset)
2167 {
2168   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2169          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2170     {
2171       parse_declaration (scanner, ruleset);
2172     }
2173 }
2174
2175 static void
2176 parse_ruleset (GtkCssScanner *scanner)
2177 {
2178   GSList *selectors;
2179   GtkCssRuleset ruleset = { 0, };
2180
2181   selectors = parse_selector_list (scanner);
2182   if (selectors == NULL)
2183     return;
2184
2185   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2186     {
2187       gtk_css_provider_error_literal (scanner->provider,
2188                                       scanner,
2189                                       GTK_CSS_PROVIDER_ERROR,
2190                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2191                                       "expected '{' after selectors");
2192       _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2193       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2194       return;
2195     }
2196
2197   parse_declarations (scanner, &ruleset);
2198
2199   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2200     {
2201       gtk_css_provider_error_literal (scanner->provider,
2202                                       scanner,
2203                                       GTK_CSS_PROVIDER_ERROR,
2204                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2205                                       "expected '}' after declarations");
2206       if (!_gtk_css_parser_is_eof (scanner->parser))
2207         {
2208           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2209           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2210           gtk_css_ruleset_clear (&ruleset);
2211           return;
2212         }
2213     }
2214
2215   css_provider_commit (scanner->provider, selectors, &ruleset);
2216   gtk_css_ruleset_clear (&ruleset);
2217 }
2218
2219 static void
2220 parse_statement (GtkCssScanner *scanner)
2221 {
2222   if (_gtk_css_parser_begins_with (scanner->parser, '@'))
2223     parse_at_keyword (scanner);
2224   else
2225     parse_ruleset (scanner);
2226 }
2227
2228 static void
2229 parse_stylesheet (GtkCssScanner *scanner)
2230 {
2231   _gtk_css_parser_skip_whitespace (scanner->parser);
2232
2233   while (!_gtk_css_parser_is_eof (scanner->parser))
2234     {
2235       if (_gtk_css_parser_try (scanner->parser, "<!--", TRUE) ||
2236           _gtk_css_parser_try (scanner->parser, "-->", TRUE))
2237         continue;
2238
2239       parse_statement (scanner);
2240     }
2241 }
2242
2243 static int
2244 gtk_css_provider_compare_rule (gconstpointer a_,
2245                                gconstpointer b_)
2246 {
2247   const GtkCssRuleset *a = (const GtkCssRuleset *) a_;
2248   const GtkCssRuleset *b = (const GtkCssRuleset *) b_;
2249   int compare;
2250
2251   compare = _gtk_css_selector_compare (a->selector, b->selector);
2252   if (compare != 0)
2253     return compare;
2254
2255   /* compare pointers in array to ensure a stable sort */
2256   if (a_ < b_)
2257     return -1;
2258
2259   if (a_ > b_)
2260     return 1;
2261
2262   return 0;
2263 }
2264
2265 static void
2266 gtk_css_provider_postprocess (GtkCssProvider *css_provider)
2267 {
2268   GtkCssProviderPrivate *priv = css_provider->priv;
2269
2270   g_array_sort (priv->rulesets, gtk_css_provider_compare_rule);
2271 }
2272
2273 static gboolean
2274 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
2275                                 GtkCssScanner  *parent,
2276                                 GFile          *file,
2277                                 const char     *data,
2278                                 gsize           length,
2279                                 GError        **error)
2280 {
2281   GtkCssScanner *scanner;
2282   gulong error_handler;
2283   char *free_data = NULL;
2284
2285   if (error)
2286     error_handler = g_signal_connect (css_provider,
2287                                       "parsing-error",
2288                                       G_CALLBACK (gtk_css_provider_propagate_error),
2289                                       error);
2290   else
2291     error_handler = 0; /* silence gcc */
2292
2293   if (data == NULL)
2294     {
2295       GError *load_error = NULL;
2296
2297       if (g_file_load_contents (file, NULL,
2298                                 &free_data, &length,
2299                                 NULL, &load_error))
2300         {
2301           data = free_data;
2302         }
2303       else
2304         {
2305           if (parent)
2306             {
2307               gtk_css_provider_error (css_provider,
2308                                       parent,
2309                                       GTK_CSS_PROVIDER_ERROR,
2310                                       GTK_CSS_PROVIDER_ERROR_IMPORT,
2311                                       "Failed to import: %s",
2312                                       load_error->message);
2313               g_error_free (load_error);
2314             }
2315           else
2316             {
2317               gtk_css_provider_take_error_full (css_provider,
2318                                                 file,
2319                                                 0, 0,
2320                                                 load_error);
2321             }
2322         }
2323     }
2324
2325   if (data)
2326     {
2327       scanner = gtk_css_scanner_new (css_provider, parent, file, data, length);
2328
2329       parse_stylesheet (scanner);
2330
2331       gtk_css_scanner_destroy (scanner);
2332
2333       if (parent == NULL)
2334         gtk_css_provider_postprocess (css_provider);
2335     }
2336
2337   g_free (free_data);
2338
2339   if (error)
2340     {
2341       g_signal_handler_disconnect (css_provider, error_handler);
2342
2343       if (*error)
2344         {
2345           /* We clear all contents from the provider for backwards compat reasons */
2346           gtk_css_provider_reset (css_provider);
2347           return FALSE;
2348         }
2349     }
2350
2351   return TRUE;
2352 }
2353
2354 /**
2355  * gtk_css_provider_load_from_data:
2356  * @css_provider: a #GtkCssProvider
2357  * @data: (array length=length) (element-type guint8): CSS data loaded in memory
2358  * @length: the length of @data in bytes, or -1 for NUL terminated strings
2359  * @error: (out) (allow-none): return location for a #GError, or %NULL
2360  *
2361  * Loads @data into @css_provider, making it clear any previously loaded
2362  * information.
2363  *
2364  * Returns: %TRUE if the data could be loaded.
2365  **/
2366 gboolean
2367 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2368                                  const gchar     *data,
2369                                  gssize           length,
2370                                  GError         **error)
2371 {
2372   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2373   g_return_val_if_fail (data != NULL, FALSE);
2374
2375   if (length < 0)
2376     length = strlen (data);
2377
2378   gtk_css_provider_reset (css_provider);
2379
2380   return gtk_css_provider_load_internal (css_provider, NULL, NULL, data, length, error);
2381 }
2382
2383 /**
2384  * gtk_css_provider_load_from_file:
2385  * @css_provider: a #GtkCssProvider
2386  * @file: #GFile pointing to a file to load
2387  * @error: (out) (allow-none): return location for a #GError, or %NULL
2388  *
2389  * Loads the data contained in @file into @css_provider, making it
2390  * clear any previously loaded information.
2391  *
2392  * Returns: %TRUE if the data could be loaded.
2393  **/
2394 gboolean
2395 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2396                                  GFile           *file,
2397                                  GError         **error)
2398 {
2399   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2400   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2401
2402   gtk_css_provider_reset (css_provider);
2403
2404   return gtk_css_provider_load_internal (css_provider, NULL, file, NULL, 0, error);
2405 }
2406
2407 /**
2408  * gtk_css_provider_load_from_path:
2409  * @css_provider: a #GtkCssProvider
2410  * @path: the path of a filename to load, in the GLib filename encoding
2411  * @error: (out) (allow-none): return location for a #GError, or %NULL
2412  *
2413  * Loads the data contained in @path into @css_provider, making it clear
2414  * any previously loaded information.
2415  *
2416  * Returns: %TRUE if the data could be loaded.
2417  **/
2418 gboolean
2419 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2420                                  const gchar     *path,
2421                                  GError         **error)
2422 {
2423   GFile *file;
2424   gboolean result;
2425
2426   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2427   g_return_val_if_fail (path != NULL, FALSE);
2428
2429   file = g_file_new_for_path (path);
2430
2431   result = gtk_css_provider_load_from_file (css_provider, file, error);
2432
2433   g_object_unref (file);
2434
2435   return result;
2436 }
2437
2438 /**
2439  * gtk_css_provider_get_default:
2440  *
2441  * Returns the provider containing the style settings used as a
2442  * fallback for all widgets.
2443  *
2444  * Returns: (transfer none): The provider used for fallback styling.
2445  *          This memory is owned by GTK+, and you must not free it.
2446  **/
2447 GtkCssProvider *
2448 gtk_css_provider_get_default (void)
2449 {
2450   static GtkCssProvider *provider;
2451
2452   if (G_UNLIKELY (!provider))
2453     {
2454       const gchar *str =
2455         "@define-color fg_color #000; \n"
2456         "@define-color bg_color #dcdad5; \n"
2457         "@define-color text_color #000; \n"
2458         "@define-color base_color #fff; \n"
2459         "@define-color selected_bg_color #4b6983; \n"
2460         "@define-color selected_fg_color #fff; \n"
2461         "@define-color tooltip_bg_color #eee1b3; \n"
2462         "@define-color tooltip_fg_color #000; \n"
2463         "@define-color placeholder_text_color #808080; \n"
2464         "\n"
2465         "@define-color info_fg_color rgb (181, 171, 156);\n"
2466         "@define-color info_bg_color rgb (252, 252, 189);\n"
2467         "@define-color warning_fg_color rgb (173, 120, 41);\n"
2468         "@define-color warning_bg_color rgb (250, 173, 61);\n"
2469         "@define-color question_fg_color rgb (97, 122, 214);\n"
2470         "@define-color question_bg_color rgb (138, 173, 212);\n"
2471         "@define-color error_fg_color rgb (166, 38, 38);\n"
2472         "@define-color error_bg_color rgb (237, 54, 54);\n"
2473         "\n"
2474         "* {\n"
2475         "  background-color: @bg_color;\n"
2476         "  color: @fg_color;\n"
2477         "  border-color: shade (@bg_color, 0.6);\n"
2478         "  padding: 2;\n"
2479         "  border-width: 0;\n"
2480         "}\n"
2481         "\n"
2482         "*:prelight {\n"
2483         "  background-color: shade (@bg_color, 1.05);\n"
2484         "  color: shade (@fg_color, 1.3);\n"
2485         "}\n"
2486         "\n"
2487         "*:selected {\n"
2488         "  background-color: @selected_bg_color;\n"
2489         "  color: @selected_fg_color;\n"
2490         "}\n"
2491         "\n"
2492         ".expander, GtkTreeView.view.expander {\n"
2493         "  color: #fff;\n"
2494         "}\n"
2495         "\n"
2496         ".expander:prelight,\n"
2497         "GtkTreeView.view.expander:selected:prelight {\n"
2498         "  color: @text_color;\n"
2499         "}\n"
2500         "\n"
2501         ".expander:active {\n"
2502         "  transition: 200ms linear;\n"
2503         "}\n"
2504         "\n"
2505         "*:insensitive {\n"
2506         "  border-color: shade (@bg_color, 0.7);\n"
2507         "  background-color: shade (@bg_color, 0.9);\n"
2508         "  color: shade (@bg_color, 0.7);\n"
2509         "}\n"
2510         "\n"
2511         ".view {\n"
2512         "  border-width: 0;\n"
2513         "  border-radius: 0;\n"
2514         "  background-color: @base_color;\n"
2515         "  color: @text_color;\n"
2516         "}\n"
2517         ".view:selected {\n"
2518         "  background-color: shade (@bg_color, 0.9);\n"
2519         "  color: @fg_color;\n"
2520         "}\n"
2521         "\n"
2522         ".view:selected:focused {\n"
2523         "  background-color: @selected_bg_color;\n"
2524         "  color: @selected_fg_color;\n"
2525         "}\n"
2526         "\n"
2527         ".view column:sorted row,\n"
2528         ".view column:sorted row:prelight {\n"
2529         "  background-color: shade (@bg_color, 0.85);\n"
2530         "}\n"
2531         "\n"
2532         ".view column:sorted row:nth-child(odd),\n"
2533         ".view column:sorted row:nth-child(odd):prelight {\n"
2534         "  background-color: shade (@bg_color, 0.8);\n"
2535         "}\n"
2536         "\n"
2537         ".view row,\n"
2538         ".view row:prelight {\n"
2539         "  background-color: @base_color;\n"
2540         "  color: @text_color;\n"
2541         "}\n"
2542         "\n"
2543         ".view row:nth-child(odd),\n"
2544         ".view row:nth-child(odd):prelight {\n"
2545         "  background-color: shade (@base_color, 0.93); \n"
2546         "}\n"
2547         "\n"
2548         ".view row:selected:focused {\n"
2549         "  background-color: @selected_bg_color;\n"
2550         "}\n"
2551         "\n"
2552         ".view row:selected {\n"
2553         "  background-color: darker (@bg_color);\n"
2554         "  color: @selected_fg_color;\n"
2555         "}\n"
2556         "\n"
2557         ".view.cell.trough,\n"
2558         ".view.cell.trough:hover,\n"
2559         ".view.cell.trough:selected,\n"
2560         ".view.cell.trough:selected:focused {\n"
2561         "  background-color: @bg_color;\n"
2562         "  color: @fg_color;\n"
2563         "}\n"
2564         "\n"
2565         ".view.cell.progressbar,\n"
2566         ".view.cell.progressbar:hover,\n"
2567         ".view.cell.progressbar:selected,\n"
2568         ".view.cell.progressbar:selected:focused {\n"
2569         "  background-color: @selected_bg_color;\n"
2570         "  color: @selected_fg_color;\n"
2571         "}\n"
2572         "\n"
2573         ".rubberband {\n"
2574         "  background-color: alpha (@fg_color, 0.25);\n"
2575         "  border-color: @fg_color;\n"
2576         "  border-style: solid;\n"
2577         "  border-width: 1;\n"
2578         "}\n"
2579         "\n"
2580         ".tooltip {\n"
2581         "  background-color: @tooltip_bg_color; \n"
2582         "  color: @tooltip_fg_color; \n"
2583         "  border-color: @tooltip_fg_color; \n"
2584         "  border-width: 1;\n"
2585         "  border-style: solid;\n"
2586         "}\n"
2587         "\n"
2588         ".button,\n"
2589         ".slider {\n"
2590         "  border-style: outset; \n"
2591         "  border-width: 2; \n"
2592         "}\n"
2593         "\n"
2594         ".button:active {\n"
2595         "  background-color: shade (@bg_color, 0.7);\n"
2596         "  border-style: inset; \n"
2597         "}\n"
2598         "\n"
2599         ".button:prelight,\n"
2600         ".slider:prelight {\n"
2601         "  background-color: @selected_bg_color;\n"
2602         "  color: @selected_fg_color;\n"
2603         "  border-color: shade (@selected_bg_color, 0.7);\n"
2604         "}\n"
2605         "\n"
2606         ".trough {\n"
2607         "  background-color: darker (@bg_color);\n"
2608         "  border-style: inset;\n"
2609         "  border-width: 1;\n"
2610         "  padding: 0;\n"
2611         "}\n"
2612         "\n"
2613         ".entry {\n"
2614         "  border-style: inset;\n"
2615         "  border-width: 2;\n"
2616         "  background-color: @base_color;\n"
2617         "  color: @text_color;\n"
2618         "}\n"
2619         "\n"
2620         ".entry:insensitive {\n"
2621         "  background-color: shade (@base_color, 0.9);\n"
2622         "  color: shade (@base_color, 0.7);\n"
2623         "}\n"
2624         ".entry:active {\n"
2625         "  background-color: #c4c2bd;\n"
2626         "  color: #000;\n"
2627         "}\n"
2628         "\n"
2629         ".progressbar,\n"
2630         ".entry.progressbar, \n"
2631         ".cell.progressbar {\n"
2632         "  background-color: @selected_bg_color;\n"
2633         "  border-color: shade (@selected_bg_color, 0.7);\n"
2634         "  color: @selected_fg_color;\n"
2635         "  border-style: outset;\n"
2636         "  border-width: 1;\n"
2637         "}\n"
2638         "\n"
2639         "GtkCheckButton:hover,\n"
2640         "GtkCheckButton:selected,\n"
2641         "GtkRadioButton:hover,\n"
2642         "GtkRadioButton:selected {\n"
2643         "  background-color: shade (@bg_color, 1.05);\n"
2644         "}\n"
2645         "\n"
2646         ".check, .radio,"
2647         ".cell.check, .cell.radio,\n"
2648         ".cell.check:hover, .cell.radio:hover {\n"
2649         "  border-style: solid;\n"
2650         "  border-width: 1;\n"
2651         "  background-color: @base_color;\n"
2652         "  border-color: @fg_color;\n"
2653         "}\n"
2654         "\n"
2655         ".check:active, .radio:active,\n"
2656         ".check:hover, .radio:hover {\n"
2657         "  background-color: @base_color;\n"
2658         "  border-color: @fg_color;\n"
2659         "  color: @text_color;\n"
2660         "}\n"
2661         "\n"
2662         ".check:selected, .radio:selected {\n"
2663         "  background-color: darker (@bg_color);\n"
2664         "  color: @selected_fg_color;\n"
2665         "  border-color: @selected_fg_color;\n"
2666         "}\n"
2667         "\n"
2668         ".check:selected:focused, .radio:selected:focused {\n"
2669         "  background-color: @selected_bg_color;\n"
2670         "}\n"
2671         "\n"
2672         ".menu.check, .menu.radio {\n"
2673         "  color: @fg_color;\n"
2674         "  border-style: none;\n"
2675         "  border-width: 0;\n"
2676         "}\n"
2677         "\n"
2678         ".popup {\n"
2679         "  border-style: outset;\n"
2680         "  border-width: 1;\n"
2681         "}\n"
2682         "\n"
2683         ".viewport {\n"
2684         "  border-style: inset;\n"
2685         "  border-width: 2;\n"
2686         "}\n"
2687         "\n"
2688         ".notebook {\n"
2689         "  border-style: outset;\n"
2690         "  border-width: 1;\n"
2691         "}\n"
2692         "\n"
2693         ".frame {\n"
2694         "  border-style: inset;\n"
2695         "  border-width: 1;\n"
2696         "}\n"
2697         "\n"
2698         "GtkScrolledWindow.frame {\n"
2699         "  padding: 0;\n"
2700         "}\n"
2701         "\n"
2702         ".menu,\n"
2703         ".menubar,\n"
2704         ".toolbar {\n"
2705         "  border-style: outset;\n"
2706         "  border-width: 1;\n"
2707         "}\n"
2708         "\n"
2709         ".menu:hover,\n"
2710         ".menubar:hover,\n"
2711         ".menu.check:hover,\n"
2712         ".menu.radio:hover {\n"
2713         "  background-color: @selected_bg_color;\n"
2714         "  color: @selected_fg_color;\n"
2715         "}\n"
2716         "\n"
2717         "GtkSpinButton.button {\n"
2718         "  border-width: 1;\n"
2719         "}\n"
2720         "\n"
2721         ".scale.slider:hover,\n"
2722         "GtkSpinButton.button:hover {\n"
2723         "  background-color: shade (@bg_color, 1.05);\n"
2724         "  border-color: shade (@bg_color, 0.8);\n"
2725         "}\n"
2726         "\n"
2727         "GtkSwitch.trough:active {\n"
2728         "  background-color: @selected_bg_color;\n"
2729         "  color: @selected_fg_color;\n"
2730         "}\n"
2731         "\n"
2732         "GtkToggleButton.button:inconsistent {\n"
2733         "  border-style: outset;\n"
2734         "  border-width: 1px;\n"
2735         "  background-color: shade (@bg_color, 0.9);\n"
2736         "  border-color: shade (@bg_color, 0.7);\n"
2737         "}\n"
2738         "\n"
2739         "GtkLabel:selected {\n"
2740         "  background-color: shade (@bg_color, 0.9);\n"
2741         "}\n"
2742         "\n"
2743         "GtkLabel:selected:focused {\n"
2744         "  background-color: @selected_bg_color;\n"
2745         "}\n"
2746         "\n"
2747         ".spinner:active {\n"
2748         "  transition: 750ms linear loop;\n"
2749         "}\n"
2750         "\n"
2751         ".info {\n"
2752         "  background-color: @info_bg_color;\n"
2753         "  color: @info_fg_color;\n"
2754         "}\n"
2755         "\n"
2756         ".warning {\n"
2757         "  background-color: @warning_bg_color;\n"
2758         "  color: @warning_fg_color;\n"
2759         "}\n"
2760         "\n"
2761         ".question {\n"
2762         "  background-color: @question_bg_color;\n"
2763         "  color: @question_fg_color;\n"
2764         "}\n"
2765         "\n"
2766         ".error {\n"
2767         "  background-color: @error_bg_color;\n"
2768         "  color: @error_fg_color;\n"
2769         "}\n"
2770         "\n"
2771         ".highlight {\n"
2772         "  background-color: @selected_bg_color;\n"
2773         "  color: @selected_fg_color;\n"
2774         "}\n"
2775         "\n"
2776         ".light-area-focus {\n"
2777         "  color: #000;\n"
2778         "}\n"
2779         "\n"
2780         ".dark-area-focus {\n"
2781         "  color: #fff;\n"
2782         "}\n"
2783         "GtkCalendar.view {\n"
2784         "  border-width: 1;\n"
2785         "  border-style: inset;\n"
2786         "  padding: 1;\n"
2787         "}\n"
2788         "\n"
2789         "GtkCalendar.view:inconsistent {\n"
2790         "  color: darker (@bg_color);\n"
2791         "}\n"
2792         "\n"
2793         "GtkCalendar.header {\n"
2794         "  background-color: @bg_color;\n"
2795         "  border-style: outset;\n"
2796         "  border-width: 2;\n"
2797         "}\n"
2798         "\n"
2799         "GtkCalendar.highlight {\n"
2800         "  border-width: 0;\n"
2801         "}\n"
2802         "\n"
2803         "GtkCalendar.button {\n"
2804         "  background-color: @bg_color;\n"
2805         "}\n"
2806         "\n"
2807         "GtkCalendar.button:hover {\n"
2808         "  background-color: lighter (@bg_color);\n"
2809         "  color: @fg_color;\n"
2810         "}\n"
2811         "\n"
2812         ".menu * {\n"
2813         "  border-width: 0;\n"
2814         "  padding: 2;\n"
2815         "}\n"
2816         "\n";
2817
2818       provider = gtk_css_provider_new ();
2819       if (!gtk_css_provider_load_from_data (provider, str, -1, NULL))
2820         {
2821           g_error ("Failed to load the internal default CSS.");
2822         }
2823     }
2824
2825   return provider;
2826 }
2827
2828 gchar *
2829 _gtk_css_provider_get_theme_dir (void)
2830 {
2831   const gchar *var;
2832   gchar *path;
2833
2834   var = g_getenv ("GTK_DATA_PREFIX");
2835
2836   if (var)
2837     path = g_build_filename (var, "share", "themes", NULL);
2838   else
2839     path = g_build_filename (GTK_DATA_PREFIX, "share", "themes", NULL);
2840
2841   return path;
2842 }
2843
2844 /**
2845  * gtk_css_provider_get_named:
2846  * @name: A theme name
2847  * @variant: (allow-none): variant to load, for example, "dark", or
2848  *     %NULL for the default
2849  *
2850  * Loads a theme from the usual theme paths
2851  *
2852  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
2853  *     This memory is owned by GTK+, and you must not free it.
2854  */
2855 GtkCssProvider *
2856 gtk_css_provider_get_named (const gchar *name,
2857                             const gchar *variant)
2858 {
2859   static GHashTable *themes = NULL;
2860   GtkCssProvider *provider;
2861   gchar *key;
2862
2863   if (G_UNLIKELY (!themes))
2864     themes = g_hash_table_new (g_str_hash, g_str_equal);
2865
2866   if (variant == NULL)
2867     key = (gchar *)name;
2868   else
2869     key = g_strconcat (name, "-", variant, NULL);
2870
2871   provider = g_hash_table_lookup (themes, key);
2872
2873   if (!provider)
2874     {
2875       const gchar *home_dir;
2876       gchar *subpath, *path = NULL;
2877
2878       if (variant)
2879         subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
2880       else
2881         subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
2882
2883       /* First look in the users home directory
2884        */
2885       home_dir = g_get_home_dir ();
2886       if (home_dir)
2887         {
2888           path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
2889
2890           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2891             {
2892               g_free (path);
2893               path = NULL;
2894             }
2895         }
2896
2897       if (!path)
2898         {
2899           gchar *theme_dir;
2900
2901           theme_dir = _gtk_css_provider_get_theme_dir ();
2902           path = g_build_filename (theme_dir, name, subpath, NULL);
2903           g_free (theme_dir);
2904
2905           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2906             {
2907               g_free (path);
2908               path = NULL;
2909             }
2910         }
2911
2912       g_free (subpath);
2913
2914       if (path)
2915         {
2916           provider = gtk_css_provider_new ();
2917
2918           if (!gtk_css_provider_load_from_path (provider, path, NULL))
2919             {
2920               g_object_unref (provider);
2921               provider = NULL;
2922             }
2923           else
2924             g_hash_table_insert (themes, g_strdup (key), provider);
2925
2926           g_free (path);
2927         }
2928     }
2929
2930   if (key != name)
2931     g_free (key);
2932
2933   return provider;
2934 }
2935
2936 static int
2937 compare_properties (gconstpointer a, gconstpointer b)
2938 {
2939   return strcmp (((const GtkStyleProperty *) a)->pspec->name,
2940                  ((const GtkStyleProperty *) b)->pspec->name);
2941 }
2942
2943 static void
2944 gtk_css_ruleset_print (const GtkCssRuleset *ruleset,
2945                        GString             *str)
2946 {
2947   GList *keys, *walk;
2948
2949   _gtk_css_selector_print (ruleset->selector, str);
2950
2951   g_string_append (str, " {\n");
2952
2953   if (ruleset->style)
2954     {
2955       keys = g_hash_table_get_keys (ruleset->style);
2956       /* so the output is identical for identical selector styles */
2957       keys = g_list_sort (keys, compare_properties);
2958
2959       for (walk = keys; walk; walk = walk->next)
2960         {
2961           GtkStyleProperty *prop = walk->data;
2962           const GValue *value = g_hash_table_lookup (ruleset->style, prop);
2963
2964           g_string_append (str, "  ");
2965           g_string_append (str, prop->pspec->name);
2966           g_string_append (str, ": ");
2967           _gtk_style_property_print_value (prop, value, str);
2968           g_string_append (str, ";\n");
2969         }
2970
2971       g_list_free (keys);
2972     }
2973
2974   if (ruleset->widget_style)
2975     {
2976       keys = g_hash_table_get_keys (ruleset->widget_style);
2977       /* so the output is identical for identical selector styles */
2978       keys = g_list_sort (keys, (GCompareFunc) strcmp);
2979
2980       for (walk = keys; walk; walk = walk->next)
2981         {
2982           const char *name = walk->data;
2983           const GValue *value = g_hash_table_lookup (ruleset->widget_style, (gpointer) name);
2984
2985           g_string_append (str, "  ");
2986           g_string_append (str, name);
2987           g_string_append (str, ": ");
2988           g_string_append (str, g_value_get_string (value));
2989           g_string_append (str, ";\n");
2990         }
2991
2992       g_list_free (keys);
2993     }
2994
2995   g_string_append (str, "}\n");
2996 }
2997
2998 static void
2999 gtk_css_provider_print_colors (GHashTable *colors,
3000                                GString    *str)
3001 {
3002   GList *keys, *walk;
3003   char *s;
3004
3005   keys = g_hash_table_get_keys (colors);
3006   /* so the output is identical for identical styles */
3007   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3008
3009   for (walk = keys; walk; walk = walk->next)
3010     {
3011       const char *name = walk->data;
3012       GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
3013
3014       g_string_append (str, "@define-color ");
3015       g_string_append (str, name);
3016       g_string_append (str, " ");
3017       s = gtk_symbolic_color_to_string (symbolic);
3018       g_string_append (str, s);
3019       g_free (s);
3020       g_string_append (str, ";\n");
3021     }
3022
3023   g_list_free (keys);
3024 }
3025
3026 /**
3027  * gtk_css_provider_to_string:
3028  * @provider: the provider to write to a string
3029  *
3030  * Convertes the @provider into a string representation in CSS
3031  * format.
3032  *
3033  * Using gtk_css_provider_load_from_data() with the return value
3034  * from this function on a new provider created with
3035  * gtk_css_provider_new() will basicallu create a duplicate of
3036  * this @provider.
3037  *
3038  * Returns: a new string representing the @provider.
3039  **/
3040 char *
3041 gtk_css_provider_to_string (GtkCssProvider *provider)
3042 {
3043   GtkCssProviderPrivate *priv;
3044   GString *str;
3045   guint i;
3046
3047   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
3048
3049   priv = provider->priv;
3050
3051   str = g_string_new ("");
3052
3053   gtk_css_provider_print_colors (priv->symbolic_colors, str);
3054
3055   for (i = 0; i < priv->rulesets->len; i++)
3056     {
3057       if (i > 0)
3058         g_string_append (str, "\n");
3059       gtk_css_ruleset_print (&g_array_index (priv->rulesets, GtkCssRuleset, i), str);
3060     }
3061
3062   return g_string_free (str, FALSE);
3063 }
3064