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>
 531  * <title>Box shadow</title>
 532  * <para>
 533  * Themes can apply shadows on framed elements using the CSS3 box-shadow syntax,
 534  * as defined in
 535  * <ulink url="http://www.w3.org/TR/css3-background/#the-box-shadow">the CSS3 specification</ulink>.
 536  * </para>
 537  * <para>
 538  * A box shadow is specified using the syntax
 539  * <literallayout>box-shadow: [ @inset ] @horizontal_offset @vertical_offset [ @blur_radius ] [ @spread ] @color</literallayout>
 540  * A positive offset will draw a shadow that is offset to the right (down) of the box,
 541  * a negative offset to the left (top). The optional spread parameter defines an additional
 542  * distance to expand the shadow shape in all directions, by the specified radius.
 543  * The optional blur radius parameter is parsed, but it is currently not rendered by
 544  * the GTK+ theming engine.
 545  * The inset parameter defines whether the drop shadow should be rendered inside or outside
 546  * the box canvas. Only inset box-shadows are currently supported by the GTK+ theming engine,
 547  * non-inset elements are currently ignored.
 548  * </para>
 549  * <para>
 550  * To set multiple box-shadows on an element, you can specify a comma-separated list
 551  * of shadow elements in the box-shadow property. Shadows are always rendered
 552  * front-back, i.e. the first shadow specified is on top of the others, so they may
 553  * overlap other boxes or other shadows.
 554  * </para>
 555  * </refsect2>
 556  * <refsect2 id="gtkcssprovider-border-image">
 557  * <title>Border images</title>
 558  * <para>
 559  * Images and gradients can also be used in slices for the purpose of creating
 560  * scalable borders.
 561  * For more information, see the CSS3 documentation for the border-image property,
 562  * which can be found <ulink url="http://www.w3.org/TR/css3-background/#border-images">here</ulink>.
 563  * </para>
 564  * <inlinegraphic fileref="slices.png" format="PNG"/>
 565  * <para>
 566  * The parameters of the slicing process are controlled by
 567  * four separate properties. Note that you can use the
 568  * <literallayout>border-image</literallayout> shorthand property
 569  * to set values for the three properties at the same time.
 570  * </para>
 571  * <para>
 572  * <literallayout>border-image-source: url(@path)
 573  * (or border-image-source: -gtk-gradient(...))</literallayout>:
 574  * Specifies the source of the border image, and it can either
 575  * be an URL or a gradient (see above).
 576  * </para>
 577  * <para>
 578  * <literallayout>border-image-slice: @top @right @bottom @left</literallayout>
 579  * The sizes specified by the @top, @right, @bottom and @left parameters
 580  * are the offsets, in pixels, from the relevant edge where the image
 581  * should be "cut off" to build the slices used for the rendering
 582  * of the border.
 583  * </para>
 584  * <para>
 585  * <literallayout>border-image-width: @top @right @bottom @left</literallayout>
 586  * The sizes specified by the @top, @right, @bottom and @left parameters
 587  * are inward distances from the border box edge, used to specify the
 588  * rendered size of each slice determined by border-image-slice.
 589  * If this property is not specified, the values of border-width will
 590  * be used as a fallback.
 591  * </para>
 592  * <para>
 593  * <literallayout>border-image-repeat: [stretch|repeat|round|space] ?
 594  * [stretch|repeat|round|space]</literallayout>
 595  * Specifies how the image slices should be rendered in the area
 596  * outlined by border-width.
 597  * The default (stretch) is to resize the slice to fill in the whole
 598  * allocated area.
 599  * If the value of this property is 'repeat', the image slice
 600  * will be tiled to fill the area.
 601  * If the value of this property is 'round', the image slice will
 602  * be tiled to fill the area, and scaled to fit it exactly
 603  * a whole number of times.
 604  * If the value of this property is 'space', the image slice will
 605  * be tiled to fill the area, and if it doesn't fit it exactly a whole
 606  * number of times, the extra space is distributed as padding around
 607  * the slices.
 608  * If two options are specified, the first one affects
 609  * the horizontal behaviour and the second one the vertical behaviour.
 610  * If only one option is specified, it affects both.
 611  * </para>
 612  * <example>
 613  * <title>A border image</title>
 614  * <inlinegraphic fileref="border1.png" format="PNG"/>
 615  * <para>This border image was specified with
 616  * <literallayout>url("gradient1.png") 10 10 10 10</literallayout>
 617  * </para>
 618  * </example>
 619  * <example>
 620  * <title>A repeating border image</title>
 621  * <inlinegraphic fileref="border2.png" format="PNG"/>
 622  * <para>This border image was specified with
 623  * <literallayout>url("gradient1.png") 10 10 10 10 repeat</literallayout>
 624  * </para>
 625  * </example>
 626  * <example>
 627  * <title>A stretched border image</title>
 628  * <inlinegraphic fileref="border3.png" format="PNG"/>
 629  * <para>This border image was specified with
 630  * <literallayout>url("gradient1.png") 10 10 10 10 stretch</literallayout>
 631  * </para>
 632  * </example>
 633  * </refsect2>
 634  * <refsect2 id="gtkcssprovider-transitions">
 635  * <para>Styles can specify transitions that will be used to create a gradual
 636  * change in the appearance when a widget state changes. The following
 637  * syntax is used to specify transitions:
 638  * <literallayout>@duration [s|ms] [linear|ease|ease-in|ease-out|ease-in-out] [loop]?</literallayout>
 639  * The @duration is the amount of time that the animation will take for
 640  * a complete cycle from start to end. If the loop option is given, the
 641  * animation will be repated until the state changes again.
 642  * The option after the duration determines the transition function from a
 643  * small set of predefined functions.
 644  * <figure><title>Linear transition</title>
 645  * <graphic fileref="linear.png" format="PNG"/>
 646  * </figure>
 647  * <figure><title>Ease transition</title>
 648  * <graphic fileref="ease.png" format="PNG"/>
 649  * </figure>
 650  * <figure><title>Ease-in-out transition</title>
 651  * <graphic fileref="ease-in-out.png" format="PNG"/>
 652  * </figure>
 653  * <figure><title>Ease-in transition</title>
 654  * <graphic fileref="ease-in.png" format="PNG"/>
 655  * </figure>
 656  * <figure><title>Ease-out transition</title>
 657  * <graphic fileref="ease-out.png" format="PNG"/>
 658  * </figure>
 659  * </para>
 660  * </refsect2>
 661  * <refsect2 id="gtkcssprovider-properties">
 662  * <title>Supported properties</title>
 663  * <para>
 664  * Properties are the part that differ the most to common CSS,
 665  * not all properties are supported (some are planned to be
 666  * supported eventually, some others are meaningless or don't
 667  * map intuitively in a widget based environment).
 668  * </para>
 669  * <para>
 670  * There is also a difference in shorthand properties, for
 671  * example in common CSS it is fine to define a font through
 672  * the different @font-family, @font-style, @font-size
 673  * properties, meanwhile in GTK+'s CSS only the canonical
 674  * @font property is supported.
 675  * </para>
 676  * <para>
 677  * The currently supported properties are:
 678  * </para>
 679  * <informaltable>
 680  *   <tgroup cols="4">
 681  *     <thead>
 682  *       <row>
 683  *         <entry>Property name</entry>
 684  *         <entry>Syntax</entry>
 685  *         <entry>Maps to</entry>
 686  *         <entry>Examples</entry>
 687  *       </row>
 688  *     </thead>
 689  *     <tbody>
 690  *       <row>
 691  *         <entry>engine</entry>
 692  *         <entry>engine-name</entry>
 693  *         <entry>#GtkThemingEngine</entry>
 694  *         <entry>engine: clearlooks;
 695  *  engine: none; /&ast; use the default (i.e. builtin) engine) &ast;/ </entry>
 696  *       </row>
 697  *       <row>
 698  *         <entry>background-color</entry>
 699  *         <entry morerows="2">color (see above)</entry>
 700  *         <entry morerows="2">#GdkRGBA</entry>
 701  *         <entry morerows="2"><literallayout>background-color: &num;fff;
 702  * color: &amp;color1;
 703  * background-color: shade (&amp;color1, 0.5);
 704  * color: mix (&amp;color1, &num;f0f, 0.8);</literallayout>
 705  *         </entry>
 706  *       </row>
 707  *       <row>
 708  *         <entry>color</entry>
 709  *       </row>
 710  *       <row>
 711  *         <entry>border-color</entry>
 712  *       </row>
 713  *       <row>
 714  *         <entry>font</entry>
 715  *         <entry>@family [@style] [@size]</entry>
 716  *         <entry>#PangoFontDescription</entry>
 717  *         <entry>font: Sans 15;</entry>
 718  *       </row>
 719  *       <row>
 720  *         <entry>margin-top</entry>
 721  *         <entry>integer</entry>
 722  *         <entry>#gint</entry>
 723  *         <entry>margin-top: 0;</entry>
 724  *       </row>
 725  *       <row>
 726  *         <entry>margin-left</entry>
 727  *         <entry>integer</entry>
 728  *         <entry>#gint</entry>
 729  *         <entry>margin-left: 1;</entry>
 730  *       </row>
 731  *       <row>
 732  *         <entry>margin-bottom</entry>
 733  *         <entry>integer</entry>
 734  *         <entry>#gint</entry>
 735  *         <entry>margin-bottom: 2;</entry>
 736  *       </row>
 737  *       <row>
 738  *         <entry>margin-right</entry>
 739  *         <entry>integer</entry>
 740  *         <entry>#gint</entry>
 741  *         <entry>margin-right: 4;</entry>
 742  *       </row>
 743  *       <row>
 744  *         <entry>margin</entry>
 745  *         <entry morerows="1"><literallayout>@width
 746  * @vertical_width @horizontal_width
 747  * @top_width @horizontal_width @bottom_width
 748  * @top_width @right_width @bottom_width @left_width</literallayout>
 749  *         </entry>
 750  *         <entry morerows="1">#GtkBorder</entry>
 751  *         <entry morerows="1"><literallayout>margin: 5;
 752  * margin: 5 10;
 753  * margin: 5 10 3;
 754  * margin: 5 10 3 5;</literallayout>
 755  *         </entry>
 756  *       </row>
 757  *       <row>
 758  *         <entry>padding-top</entry>
 759  *         <entry>integer</entry>
 760  *         <entry>#gint</entry>
 761  *         <entry>padding-top: 5;</entry>
 762  *       </row>
 763  *       <row>
 764  *         <entry>padding-left</entry>
 765  *         <entry>integer</entry>
 766  *         <entry>#gint</entry>
 767  *         <entry>padding-left: 5;</entry>
 768  *       </row>
 769  *       <row>
 770  *         <entry>padding-bottom</entry>
 771  *         <entry>integer</entry>
 772  *         <entry>#gint</entry>
 773  *         <entry>padding-bottom: 5;</entry>
 774  *       </row>
 775  *       <row>
 776  *         <entry>padding-right</entry>
 777  *         <entry>integer</entry>
 778  *         <entry>#gint</entry>
 779  *         <entry>padding-right: 5;</entry>
 780  *       </row>
 781  *       <row>
 782  *         <entry>padding</entry>
 783  *       </row>
 784  *       <row>
 785  *         <entry>background-image</entry>
 786  *         <entry><literallayout>gradient (see above) or
 787  * url(@path)</literallayout></entry>
 788  *         <entry>#cairo_pattern_t</entry>
 789  *         <entry><literallayout>-gtk-gradient (linear,
 790  *                left top, right top,
 791  *                from (&num;fff), to (&num;000));
 792  * -gtk-gradient (linear, 0.0 0.5, 0.5 1.0,
 793  *                from (&num;fff),
 794  *                color-stop (0.5, &num;f00),
 795  *                to (&num;000));
 796  * -gtk-gradient (radial,
 797  *                center center, 0.2,
 798  *                center center, 0.8,
 799  *                color-stop (0.0, &num;fff),
 800  *                color-stop (1.0, &num;000));
 801  * url ('background.png');</literallayout>
 802  *         </entry>
 803  *       </row>
 804  *       <row>
 805  *         <entry>border-top-width</entry>
 806  *         <entry>integer</entry>
 807  *         <entry>#gint</entry>
 808  *         <entry>border-top-width: 5;</entry>
 809  *       </row>
 810  *       <row>
 811  *         <entry>border-left-width</entry>
 812  *         <entry>integer</entry>
 813  *         <entry>#gint</entry>
 814  *         <entry>border-left-width: 5;</entry>
 815  *       </row>
 816  *       <row>
 817  *         <entry>border-bottom-width</entry>
 818  *         <entry>integer</entry>
 819  *         <entry>#gint</entry>
 820  *         <entry>border-bottom-width: 5;</entry>
 821  *       </row>
 822  *       <row>
 823  *         <entry>border-right-width</entry>
 824  *         <entry>integer</entry>
 825  *         <entry>#gint</entry>
 826  *         <entry>border-right-width: 5;</entry>
 827  *       </row>
 828  *       <row>
 829  *         <entry>border-width</entry>
 830  *         <entry morerows="1">#GtkBorder</entry>
 831  *         <entry morerows="1"><literallayout>border-width: 1;
 832  * border-width: 1 2;
 833  * border-width: 1 2 3;
 834  * border-width: 1 2 3 5;</literallayout>
 835  *         </entry>
 836  *       </row>
 837  *       <row>
 838  *         <entry>border-radius</entry>
 839  *         <entry>integer</entry>
 840  *         <entry>#gint</entry>
 841  *         <entry>border-radius: 5;</entry>
 842  *       </row>
 843  *       <row>
 844  *         <entry>border-style</entry>
 845  *         <entry>[none|solid|inset|outset]</entry>
 846  *         <entry>#GtkBorderStyle</entry>
 847  *         <entry>border-style: solid;</entry>
 848  *       </row>
 849  *       <row>
 850  *         <entry>border-image</entry>
 851  *         <entry><literallayout>border image (see above)</literallayout></entry>
 852  *         <entry>internal use only</entry>
 853  *         <entry><literallayout>border-image: url("/path/to/image.png") 3 4 3 4 stretch;
 854  * border-image: url("/path/to/image.png") 3 4 4 3 repeat stretch;</literallayout>
 855  *         </entry>
 856  *       </row>
 857  *       <row>
 858  *         <entry>text-shadow</entry>
 859  *         <entry>shadow list (see above)</entry>
 860  *         <entry>#GtkTextShadow</entry>
 861  *         <entry><literallayout>text-shadow: 1 1 0 blue, -4 -4 red;</literallayout></entry>
 862  *       </row>
 863  *       <row>
 864  *         <entry>transition</entry>
 865  *         <entry>transition (see above)</entry>
 866  *         <entry>internal use only</entry>
 867  *         <entry><literallayout>transition: 150ms ease-in-out;
 868  * transition: 1s linear loop;</literallayout>
 869  *         </entry>
 870  *       </row>
 871  *       <row>
 872  *         <entry>gtk-key-bindings</entry>
 873  *         <entry>binding set name list</entry>
 874  *         <entry>internal use only</entry>
 875  *         <entry><literallayout>gtk-bindings: binding1, binding2, ...;</literallayout>
 876  *         </entry>
 877  *       </row>
 878  *     </tbody>
 879  *   </tgroup>
 880  * </informaltable>
 881  * <para>
 882  * GtkThemingEngines can register their own, engine-specific style properties
 883  * with the function gtk_theming_engine_register_property(). These properties
 884  * can be set in CSS like other properties, using a name of the form
 885  * <literallayout>-<replaceable>namespace</replaceable>-<replaceable>name</replaceable></literallayout>, where <replaceable>namespace</replaceable> is typically
 886  * the name of the theming engine, and <replaceable>name</replaceable> is the
 887  * name of the property. Style properties that have been registered by widgets
 888  * using gtk_widget_class_install_style_property() can also be set in this
 889  * way, using the widget class name for <replaceable>namespace</replaceable>.
 890  * </para>
 891  * <example>
 892  * <title>Using engine-specific style properties</title>
 893  * <programlisting>
 894  * * {
 895  *     engine: clearlooks;
 896  *     border-radius: 4;
 897  *     -GtkPaned-handle-size: 6;
 898  *     -clearlooks-colorize-scrollbar: false;
 899  * }
 900  * </programlisting>
 901  * </example>
 902  * </refsect2>
 903  */
 904
 905 typedef struct GtkCssRuleset GtkCssRuleset;
 906 typedef struct _GtkCssScanner GtkCssScanner;
 907 typedef enum ParserScope ParserScope;
 908 typedef enum ParserSymbol ParserSymbol;
 909
 910 struct GtkCssRuleset
 911 {
 912   GtkCssSelector *selector;
 913   GHashTable *widget_style;
 914   GHashTable *style;
 915
 916   guint has_inherit :1;
 917 };
 918
 919 struct _GtkCssScanner
 920 {
 921   GtkCssProvider *provider;
 922   GtkCssParser *parser;
 923   GtkCssScanner *parent;
 924   GFile *file;
 925   GFile *base;
 926   GSList *state;
 927   GSList *cur_selectors;
 928   GHashTable *cur_properties;
 929 };
 930
 931 struct _GtkCssProviderPrivate
 932 {
 933   GScanner *scanner;
 934
 935   GHashTable *symbolic_colors;
 936
 937   GArray *rulesets;
 938 };
 939
 940 enum ParserScope {
 941   SCOPE_SELECTOR,
 942   SCOPE_PSEUDO_CLASS,
 943   SCOPE_NTH_CHILD,
 944   SCOPE_DECLARATION,
 945   SCOPE_VALUE,
 946   SCOPE_BINDING_SET
 947 };
 948
 949 /* Extend GtkStateType, since these
 950  * values are also used as symbols
 951  */
 952 enum ParserSymbol {
 953   /* Scope: pseudo-class */
 954   SYMBOL_NTH_CHILD = GTK_STATE_FOCUSED + 1,
 955   SYMBOL_FIRST_CHILD,
 956   SYMBOL_LAST_CHILD,
 957   SYMBOL_SORTED_CHILD,
 958
 959   /* Scope: nth-child */
 960   SYMBOL_NTH_CHILD_EVEN,
 961   SYMBOL_NTH_CHILD_ODD,
 962   SYMBOL_NTH_CHILD_FIRST,
 963   SYMBOL_NTH_CHILD_LAST
 964 };
 965
 966 enum {
 967   PARSING_ERROR,
 968   LAST_SIGNAL
 969 };
 970
 971 static guint css_provider_signals[LAST_SIGNAL] = { 0 };
 972
 973 static void gtk_css_provider_finalize (GObject *object);
 974 static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
 975
 976 static gboolean
 977 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
 978                                 GtkCssScanner  *scanner,
 979                                 GFile          *file,
 980                                 const char     *data,
 981                                 gsize           length,
 982                                 GError        **error);
 983
 984 GQuark
 985 gtk_css_provider_error_quark (void)
 986 {
 987   return g_quark_from_static_string ("gtk-css-provider-error-quark");
 988 }
 989
 990 G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
 991                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
 992                                                gtk_css_style_provider_iface_init));
 993
 994 static void
 995 gtk_css_provider_parsing_error (GtkCssProvider  *provider,
 996                                 const gchar     *path,
 997                                 guint            line,
 998                                 guint            position,
 999                                 const GError *   error)
1000 {
1001   /* Only emit a warning when we have no error handlers. This is our
1002    * default handlers. And in this case erroneous CSS files are a bug
1003    * and should be fixed.
1004    * Note that these warnings can also be triggered by a broken theme
1005    * that people installed from some weird location on the internets.
1006    */
1007   if (!g_signal_has_handler_pending (provider,
1008                                      css_provider_signals[PARSING_ERROR],
1009                                      0,
1010                                      TRUE))
1011     {
1012       g_warning ("Theme parsing error: %s:%u:%u: %s", path ? path : "<unknown>", line, position, error->message);
1013     }
1014 }
1015
1016 static void
1017 gtk_css_provider_class_init (GtkCssProviderClass *klass)
1018 {
1019   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1020
1021   /**
1022    * GtkCssProvider::parsing-error:
1023    * @provider: the provider that had a parsing error
1024    * @path: path to the parsed file or %NULL if the file cannot be
1025    *   identified or the data was not loaded from a file
1026    * @line: line in the file or data or 0 if unknown
1027    * @position: offset into the current line or 0 if unknown or the
1028    *   whole line is affected
1029    * @error: The parsing error
1030    *
1031    * Signals that a parsing error occured. the @path, @line and @position
1032    * describe the actual location of the error as accurately as possible.
1033    *
1034    * Parsing errors are never fatal, so the parsing will resume after
1035    * the error. Errors may however cause parts of the given
1036    * data or even all of it to not be parsed at all. So it is a useful idea
1037    * to check that the parsing succeeds by connecting to this signal.
1038    *
1039    * Note that this signal may be emitted at any time as the css provider
1040    * may opt to defer parsing parts or all of the input to a later time
1041    * than when a loading function was called.
1042    */
1043   css_provider_signals[PARSING_ERROR] =
1044     g_signal_new (I_("parsing-error"),
1045                   G_TYPE_FROM_CLASS (object_class),
1046                   G_SIGNAL_RUN_LAST,
1047                   G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
1048                   NULL, NULL,
1049                   _gtk_marshal_VOID__STRING_UINT_UINT_BOXED,
1050                   G_TYPE_NONE, 4,
1051                   G_TYPE_STRING, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_ERROR);
1052
1053   object_class->finalize = gtk_css_provider_finalize;
1054
1055   klass->parsing_error = gtk_css_provider_parsing_error;
1056
1057   g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
1058 }
1059
1060 static void
1061 gtk_css_provider_take_error_full (GtkCssProvider *provider,
1062                                   GFile          *file,
1063                                   guint           line,
1064                                   guint           position,
1065                                   GError         *error)
1066 {
1067   char *filename;
1068
1069   if (file)
1070     filename = g_file_get_path (file);
1071   else
1072     filename = NULL;
1073
1074   g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
1075                  filename, line, position, error);
1076
1077   g_free (filename);
1078   g_error_free (error);
1079 }
1080
1081 static void
1082 gtk_css_ruleset_init_copy (GtkCssRuleset       *new,
1083                            const GtkCssRuleset *ruleset,
1084                            GtkCssSelector      *selector)
1085 {
1086   memcpy (new, ruleset, sizeof (GtkCssRuleset));
1087
1088   new->selector = selector;
1089   if (new->widget_style)
1090     g_hash_table_ref (new->widget_style);
1091   if (new->style)
1092     g_hash_table_ref (new->style);
1093 }
1094
1095 static void
1096 gtk_css_ruleset_clear (GtkCssRuleset *ruleset)
1097 {
1098   if (ruleset->style)
1099     g_hash_table_unref (ruleset->style);
1100   if (ruleset->widget_style)
1101     g_hash_table_unref (ruleset->widget_style);
1102   if (ruleset->selector)
1103     _gtk_css_selector_free (ruleset->selector);
1104
1105   memset (ruleset, 0, sizeof (GtkCssRuleset));
1106 }
1107
1108 static void
1109 property_value_free (GValue *value)
1110 {
1111   if (G_IS_VALUE (value))
1112     g_value_unset (value);
1113
1114   g_slice_free (GValue, value);
1115 }
1116
1117 static void
1118 gtk_css_ruleset_add_style (GtkCssRuleset *ruleset,
1119                            char          *name,
1120                            GValue        *value)
1121 {
1122   if (ruleset->widget_style == NULL)
1123     ruleset->widget_style = g_hash_table_new_full (g_str_hash,
1124                                                    g_str_equal,
1125                                                    (GDestroyNotify) g_free,
1126                                                    (GDestroyNotify) property_value_free);
1127
1128   g_hash_table_insert (ruleset->widget_style, name, value);
1129 }
1130
1131 static void
1132 gtk_css_ruleset_add (GtkCssRuleset          *ruleset,
1133                      const GtkStyleProperty *prop,
1134                      GValue                 *value)
1135 {
1136   if (ruleset->style == NULL)
1137     ruleset->style = g_hash_table_new_full (g_direct_hash,
1138                                             g_direct_equal,
1139                                             NULL,
1140                                             (GDestroyNotify) property_value_free);
1141
1142   if (_gtk_style_property_is_shorthand (prop))
1143     {
1144       GParameter *parameters;
1145       guint i, n_parameters;
1146
1147       parameters = _gtk_style_property_unpack (prop, value, &n_parameters);
1148
1149       for (i = 0; i < n_parameters; i++)
1150         {
1151           const GtkStyleProperty *child;
1152           GValue *value;
1153
1154           child = _gtk_style_property_lookup (parameters[i].name);
1155           value = g_slice_dup (GValue, &parameters[i].value);
1156           gtk_css_ruleset_add (ruleset, child, value);
1157         }
1158       g_free (parameters);
1159       property_value_free (value);
1160       return;
1161     }
1162
1163   ruleset->has_inherit |= _gtk_style_property_is_inherit (prop);
1164   g_hash_table_insert (ruleset->style, (gpointer) prop, value);
1165 }
1166
1167 static gboolean
1168 gtk_css_ruleset_matches (GtkCssRuleset *ruleset,
1169                          GtkWidgetPath *path,
1170                          guint          length)
1171 {
1172   return _gtk_css_selector_matches (ruleset->selector, path, length);
1173 }
1174
1175 static void
1176 gtk_css_scanner_reset (GtkCssScanner *scanner)
1177 {
1178   g_slist_free (scanner->state);
1179   scanner->state = NULL;
1180
1181   g_slist_free_full (scanner->cur_selectors, (GDestroyNotify) _gtk_css_selector_free);
1182   scanner->cur_selectors = NULL;
1183
1184   if (scanner->cur_properties)
1185     g_hash_table_unref (scanner->cur_properties);
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
1193 static void
1194 gtk_css_scanner_destroy (GtkCssScanner *scanner)
1195 {
1196   gtk_css_scanner_reset (scanner);
1197
1198   g_object_unref (scanner->provider);
1199   if (scanner->file)
1200     g_object_unref (scanner->file);
1201   g_object_unref (scanner->base);
1202   g_hash_table_destroy (scanner->cur_properties);
1203   _gtk_css_parser_free (scanner->parser);
1204
1205   g_slice_free (GtkCssScanner, scanner);
1206 }
1207
1208 static void
1209 gtk_css_scanner_parser_error (GtkCssParser *parser,
1210                               const GError *error,
1211                               gpointer      user_data)
1212 {
1213   GtkCssScanner *scanner = user_data;
1214
1215   gtk_css_provider_take_error_full (scanner->provider,
1216                                     scanner->file,
1217                                     _gtk_css_parser_get_line (scanner->parser),
1218                                     _gtk_css_parser_get_position (scanner->parser),
1219                                     g_error_copy (error));
1220 }
1221
1222 static GtkCssScanner *
1223 gtk_css_scanner_new (GtkCssProvider *provider,
1224                      GtkCssScanner  *parent,
1225                      GFile          *file,
1226                      const gchar    *data,
1227                      gsize           length)
1228 {
1229   GtkCssScanner *scanner;
1230
1231   g_assert (data[length] == 0);
1232
1233   scanner = g_slice_new0 (GtkCssScanner);
1234
1235   g_object_ref (provider);
1236   scanner->provider = provider;
1237   scanner->parent = parent;
1238
1239   if (file)
1240     {
1241       scanner->file = g_object_ref (file);
1242       scanner->base = g_file_get_parent (file);
1243     }
1244   else
1245     {
1246       char *dir = g_get_current_dir ();
1247       scanner->base = g_file_new_for_path (dir);
1248       g_free (dir);
1249     }
1250
1251   scanner->cur_properties = g_hash_table_new_full (g_str_hash,
1252                                                    g_str_equal,
1253                                                    (GDestroyNotify) g_free,
1254                                                    (GDestroyNotify) property_value_free);
1255
1256   scanner->parser = _gtk_css_parser_new (data,
1257                                          gtk_css_scanner_parser_error,
1258                                          scanner);
1259
1260   return scanner;
1261 }
1262
1263 static GFile *
1264 gtk_css_scanner_get_base_url (GtkCssScanner *scanner)
1265 {
1266   return scanner->base;
1267 }
1268
1269 static gboolean
1270 gtk_css_scanner_would_recurse (GtkCssScanner *scanner,
1271                                GFile         *file)
1272 {
1273   while (scanner)
1274     {
1275       if (scanner->file && g_file_equal (scanner->file, file))
1276         return TRUE;
1277
1278       scanner = scanner->parent;
1279     }
1280
1281   return FALSE;
1282 }
1283
1284 static void
1285 gtk_css_provider_init (GtkCssProvider *css_provider)
1286 {
1287   GtkCssProviderPrivate *priv;
1288
1289   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1290                                                            GTK_TYPE_CSS_PROVIDER,
1291                                                            GtkCssProviderPrivate);
1292
1293   priv->rulesets = g_array_new (FALSE, FALSE, sizeof (GtkCssRuleset));
1294
1295   priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
1296                                                  (GDestroyNotify) g_free,
1297                                                  (GDestroyNotify) gtk_symbolic_color_unref);
1298 }
1299
1300 static void
1301 css_provider_dump_symbolic_colors (GtkCssProvider     *css_provider,
1302                                    GtkStyleProperties *props)
1303 {
1304   GtkCssProviderPrivate *priv;
1305   GHashTableIter iter;
1306   gpointer key, value;
1307
1308   priv = css_provider->priv;
1309   g_hash_table_iter_init (&iter, priv->symbolic_colors);
1310
1311   while (g_hash_table_iter_next (&iter, &key, &value))
1312     {
1313       const gchar *name;
1314       GtkSymbolicColor *color;
1315
1316       name = key;
1317       color = value;
1318
1319       gtk_style_properties_map_color (props, name, color);
1320     }
1321 }
1322
1323 static GtkStyleProperties *
1324 gtk_css_provider_get_style (GtkStyleProvider *provider,
1325                             GtkWidgetPath    *path)
1326 {
1327   GtkCssProvider *css_provider;
1328   GtkCssProviderPrivate *priv;
1329   GtkStyleProperties *props;
1330   guint i, l, length;
1331
1332   css_provider = GTK_CSS_PROVIDER (provider);
1333   priv = css_provider->priv;
1334   length = gtk_widget_path_length (path);
1335   props = gtk_style_properties_new ();
1336
1337   css_provider_dump_symbolic_colors (css_provider, props);
1338
1339   for (l = 1; l <= length; l++)
1340     {
1341       for (i = 0; i < priv->rulesets->len; i++)
1342         {
1343           GtkCssRuleset *ruleset;
1344           GHashTableIter iter;
1345           gpointer key, value;
1346
1347           ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1348
1349           if (ruleset->style == NULL)
1350             continue;
1351
1352           if (l < length && (!ruleset->has_inherit || _gtk_css_selector_get_state_flags (ruleset->selector)))
1353             continue;
1354
1355           if (!gtk_css_ruleset_matches (ruleset, path, l))
1356             continue;
1357
1358           g_hash_table_iter_init (&iter, ruleset->style);
1359
1360           while (g_hash_table_iter_next (&iter, &key, &value))
1361             {
1362               GtkStyleProperty *prop = key;
1363
1364               if (l != length && !_gtk_style_property_is_inherit (prop))
1365                 continue;
1366
1367               _gtk_style_properties_set_property_by_property (props,
1368                                                               prop,
1369                                                               _gtk_css_selector_get_state_flags (ruleset->selector),
1370                                                               value);
1371             }
1372         }
1373     }
1374
1375   return props;
1376 }
1377
1378 static void
1379 gtk_css_provider_parser_error (GtkCssParser *parser,
1380                                const GError *error,
1381                                gpointer      user_data)
1382 {
1383   GtkCssProvider *provider = user_data;
1384
1385   gtk_css_provider_take_error_full (provider,
1386                                     NULL,
1387                                     _gtk_css_parser_get_line (parser),
1388                                     _gtk_css_parser_get_position (parser),
1389                                     g_error_copy (error));
1390 }
1391
1392 static gboolean
1393 gtk_css_provider_get_style_property (GtkStyleProvider *provider,
1394                                      GtkWidgetPath    *path,
1395                                      GtkStateFlags     state,
1396                                      GParamSpec       *pspec,
1397                                      GValue           *value)
1398 {
1399   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1400   GtkCssProviderPrivate *priv = css_provider->priv;
1401   const GValue *val;
1402   gboolean found = FALSE;
1403   gchar *prop_name;
1404   gint i;
1405
1406   prop_name = g_strdup_printf ("-%s-%s",
1407                                g_type_name (pspec->owner_type),
1408                                pspec->name);
1409
1410   for (i = priv->rulesets->len - 1; i >= 0; i--)
1411     {
1412       GtkCssRuleset *ruleset;
1413       GtkStateFlags selector_state;
1414
1415       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1416
1417       if (ruleset->widget_style == NULL)
1418         continue;
1419
1420       if (!gtk_css_ruleset_matches (ruleset, path, gtk_widget_path_length (path)))
1421         continue;
1422
1423       selector_state = _gtk_css_selector_get_state_flags (ruleset->selector);
1424       val = g_hash_table_lookup (ruleset->widget_style, prop_name);
1425
1426       if (val &&
1427           (selector_state == 0 ||
1428            selector_state == state ||
1429            ((selector_state & state) != 0 &&
1430             (selector_state & ~(state)) == 0)))
1431         {
1432           GtkCssParser *parser;
1433
1434           parser = _gtk_css_parser_new (g_value_get_string (val),
1435                                         gtk_css_provider_parser_error,
1436                                         provider);
1437
1438           found = _gtk_style_property_parse_value (NULL,
1439                                                    value,
1440                                                    parser,
1441                                                    NULL);
1442
1443           _gtk_css_parser_free (parser);
1444
1445           if (found)
1446             break;
1447         }
1448     }
1449
1450   g_free (prop_name);
1451
1452   return found;
1453 }
1454
1455 static void
1456 gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
1457 {
1458   iface->get_style = gtk_css_provider_get_style;
1459   iface->get_style_property = gtk_css_provider_get_style_property;
1460 }
1461
1462 static void
1463 gtk_css_provider_finalize (GObject *object)
1464 {
1465   GtkCssProvider *css_provider;
1466   GtkCssProviderPrivate *priv;
1467   guint i;
1468
1469   css_provider = GTK_CSS_PROVIDER (object);
1470   priv = css_provider->priv;
1471
1472   for (i = 0; i < priv->rulesets->len; i++)
1473     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1474
1475   g_array_free (priv->rulesets, TRUE);
1476
1477   if (priv->symbolic_colors)
1478     g_hash_table_destroy (priv->symbolic_colors);
1479
1480   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1481 }
1482
1483 /**
1484  * gtk_css_provider_new:
1485  *
1486  * Returns a newly created #GtkCssProvider.
1487  *
1488  * Returns: A new #GtkCssProvider
1489  **/
1490 GtkCssProvider *
1491 gtk_css_provider_new (void)
1492 {
1493   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1494 }
1495
1496 static void
1497 gtk_css_provider_take_error (GtkCssProvider *provider,
1498                              GtkCssScanner  *scanner,
1499                              GError         *error)
1500 {
1501   gtk_css_provider_take_error_full (provider,
1502                                     scanner->file,
1503                                     _gtk_css_parser_get_line (scanner->parser),
1504                                     _gtk_css_parser_get_position (scanner->parser),
1505                                     error);
1506 }
1507
1508 static void
1509 gtk_css_provider_error_literal (GtkCssProvider *provider,
1510                                 GtkCssScanner  *scanner,
1511                                 GQuark          domain,
1512                                 gint            code,
1513                                 const char     *message)
1514 {
1515   gtk_css_provider_take_error (provider,
1516                                scanner,
1517                                g_error_new_literal (domain, code, message));
1518 }
1519
1520 static void
1521 gtk_css_provider_error (GtkCssProvider *provider,
1522                         GtkCssScanner  *scanner,
1523                         GQuark          domain,
1524                         gint            code,
1525                         const char     *format,
1526                         ...)  G_GNUC_PRINTF (5, 6);
1527 static void
1528 gtk_css_provider_error (GtkCssProvider *provider,
1529                         GtkCssScanner  *scanner,
1530                         GQuark          domain,
1531                         gint            code,
1532                         const char     *format,
1533                         ...)
1534 {
1535   GError *error;
1536   va_list args;
1537
1538   va_start (args, format);
1539   error = g_error_new_valist (domain, code, format, args);
1540   va_end (args);
1541
1542   gtk_css_provider_take_error (provider, scanner, error);
1543 }
1544
1545 static void
1546 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1547                                 GtkCssScanner  *scanner,
1548                                 const char     *expected)
1549 {
1550   gtk_css_provider_error (provider,
1551                           scanner,
1552                           GTK_CSS_PROVIDER_ERROR,
1553                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1554                           "expected a valid %s", expected);
1555 }
1556
1557 static void
1558 css_provider_commit (GtkCssProvider *css_provider,
1559                      GSList         *selectors,
1560                      GtkCssRuleset  *ruleset)
1561 {
1562   GtkCssProviderPrivate *priv;
1563   GSList *l;
1564
1565   priv = css_provider->priv;
1566
1567   if (ruleset->style == NULL && ruleset->widget_style == NULL)
1568     {
1569       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
1570       return;
1571     }
1572
1573   for (l = selectors; l; l = l->next)
1574     {
1575       GtkCssRuleset new;
1576
1577       gtk_css_ruleset_init_copy (&new, ruleset, l->data);
1578
1579       g_array_append_val (priv->rulesets, new);
1580     }
1581
1582   g_slist_free (selectors);
1583 }
1584
1585 static void
1586 gtk_css_provider_reset (GtkCssProvider *css_provider)
1587 {
1588   GtkCssProviderPrivate *priv;
1589   guint i;
1590
1591   priv = css_provider->priv;
1592
1593   g_hash_table_remove_all (priv->symbolic_colors);
1594
1595   for (i = 0; i < priv->rulesets->len; i++)
1596     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1597   g_array_set_size (priv->rulesets, 0);
1598 }
1599
1600 static void
1601 gtk_css_provider_propagate_error (GtkCssProvider  *provider,
1602                                   const gchar     *path,
1603                                   guint            line,
1604                                   guint            position,
1605                                   const GError    *error,
1606                                   GError         **propagate_to)
1607 {
1608   /* don't fail for deprecations */
1609   if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
1610     {
1611       g_warning ("Theme parsing error: %s:%u:%u: %s", path ? path : "<unknown>", line, position, error->message);
1612       return;
1613     }
1614
1615   /* we already set an error. And we'd like to keep the first one */
1616   if (*propagate_to)
1617     return;
1618
1619   *propagate_to = g_error_copy (error);
1620   g_prefix_error (propagate_to, "%s:%u:%u: ", path ? path : "<unknown>", line, position);
1621 }
1622
1623 static void
1624 parse_import (GtkCssScanner *scanner)
1625 {
1626   GFile *file;
1627   char *uri;
1628
1629   uri = _gtk_css_parser_read_uri (scanner->parser);
1630   if (uri == NULL)
1631     {
1632       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1633       return;
1634     }
1635
1636   file = g_file_resolve_relative_path (gtk_css_scanner_get_base_url (scanner), uri);
1637   g_free (uri);
1638
1639   if (gtk_css_scanner_would_recurse (scanner, file))
1640     {
1641        char *path = g_file_get_path (file);
1642        gtk_css_provider_error (scanner->provider,
1643                                scanner,
1644                                GTK_CSS_PROVIDER_ERROR,
1645                                GTK_CSS_PROVIDER_ERROR_IMPORT,
1646                                "Loading '%s' would recurse",
1647                                path);
1648        g_free (path);
1649     }
1650   else
1651     {
1652       gtk_css_provider_load_internal (scanner->provider,
1653                                       scanner,
1654                                       file,
1655                                       NULL, 0,
1656                                       NULL);
1657     }
1658
1659   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1660     {
1661       g_object_unref (file);
1662       gtk_css_provider_invalid_token (scanner->provider, scanner, "semicolon");
1663       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1664       return;
1665     }
1666
1667   g_object_unref (file);
1668 }
1669
1670 static void
1671 parse_color_definition (GtkCssScanner *scanner)
1672 {
1673   GtkSymbolicColor *symbolic;
1674   char *name;
1675
1676   name = _gtk_css_parser_try_name (scanner->parser, TRUE);
1677   if (name == NULL)
1678     {
1679       gtk_css_provider_error_literal (scanner->provider,
1680                                       scanner,
1681                                       GTK_CSS_PROVIDER_ERROR,
1682                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1683                                       "Not a valid color name");
1684       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1685       return;
1686     }
1687
1688   symbolic = _gtk_css_parser_read_symbolic_color (scanner->parser);
1689   if (symbolic == NULL)
1690     {
1691       g_free (name);
1692       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1693       return;
1694     }
1695
1696   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1697     {
1698       g_free (name);
1699       gtk_symbolic_color_unref (symbolic);
1700       gtk_css_provider_error_literal (scanner->provider,
1701                                       scanner,
1702                                       GTK_CSS_PROVIDER_ERROR,
1703                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1704                                       "Missing semicolon at end of color definition");
1705       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1706       return;
1707     }
1708
1709   g_hash_table_insert (scanner->provider->priv->symbolic_colors, name, symbolic);
1710 }
1711
1712 static void
1713 parse_binding_set (GtkCssScanner *scanner)
1714 {
1715   GtkBindingSet *binding_set;
1716   char *name;
1717
1718   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1719   if (name == NULL)
1720     {
1721       gtk_css_provider_error_literal (scanner->provider,
1722                                       scanner,
1723                                       GTK_CSS_PROVIDER_ERROR,
1724                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1725                                       "Expected name for binding set");
1726       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1727       goto skip_semicolon;
1728     }
1729
1730   binding_set = gtk_binding_set_find (name);
1731   if (!binding_set)
1732     {
1733       binding_set = gtk_binding_set_new (name);
1734       binding_set->parsed = TRUE;
1735     }
1736   g_free (name);
1737
1738   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
1739     {
1740       gtk_css_provider_error_literal (scanner->provider,
1741                                       scanner,
1742                                       GTK_CSS_PROVIDER_ERROR,
1743                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1744                                       "Expected '{' for binding set");
1745       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1746       goto skip_semicolon;
1747     }
1748
1749   while (!_gtk_css_parser_is_eof (scanner->parser) &&
1750          !_gtk_css_parser_begins_with (scanner->parser, '}'))
1751     {
1752       name = _gtk_css_parser_read_value (scanner->parser);
1753       if (name == NULL)
1754         {
1755           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1756           continue;
1757         }
1758
1759       gtk_binding_entry_add_signal_from_string (binding_set, name);
1760       g_free (name);
1761
1762       if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1763         {
1764           if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
1765               !_gtk_css_parser_is_eof (scanner->parser))
1766             {
1767               gtk_css_provider_error_literal (scanner->provider,
1768                                               scanner,
1769                                               GTK_CSS_PROVIDER_ERROR,
1770                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
1771                                               "Expected semicolon");
1772               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1773             }
1774         }
1775     }
1776
1777   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
1778     {
1779       gtk_css_provider_error_literal (scanner->provider,
1780                                       scanner,
1781                                       GTK_CSS_PROVIDER_ERROR,
1782                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1783                                       "expected '}' after declarations");
1784       if (!_gtk_css_parser_is_eof (scanner->parser))
1785         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
1786     }
1787
1788 skip_semicolon:
1789   if (_gtk_css_parser_try (scanner->parser, ";", TRUE))
1790     gtk_css_provider_error_literal (scanner->provider,
1791                                     scanner,
1792                                     GTK_CSS_PROVIDER_ERROR,
1793                                     GTK_CSS_PROVIDER_ERROR_DEPRECATED,
1794                                     "Nonstandard semicolon at end of binding set");
1795 }
1796
1797 static void
1798 parse_at_keyword (GtkCssScanner *scanner)
1799 {
1800   if (_gtk_css_parser_try (scanner->parser, "@import", TRUE))
1801     parse_import (scanner);
1802   else if (_gtk_css_parser_try (scanner->parser, "@define-color", TRUE))
1803     parse_color_definition (scanner);
1804   else if (_gtk_css_parser_try (scanner->parser, "@binding-set", TRUE))
1805     parse_binding_set (scanner);
1806   else
1807     {
1808       gtk_css_provider_error_literal (scanner->provider,
1809                                       scanner,
1810                                       GTK_CSS_PROVIDER_ERROR,
1811                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1812                                       "unknown @ rule");
1813       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1814     }
1815 }
1816
1817 static gboolean
1818 parse_selector_class (GtkCssScanner *scanner, GArray *classes)
1819 {
1820   GQuark qname;
1821   char *name;
1822
1823   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
1824
1825   if (name == NULL)
1826     {
1827       gtk_css_provider_error_literal (scanner->provider,
1828                                       scanner,
1829                                       GTK_CSS_PROVIDER_ERROR,
1830                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1831                                       "Expected a valid name for class");
1832       return FALSE;
1833     }
1834
1835   qname = g_quark_from_string (name);
1836   g_array_append_val (classes, qname);
1837   g_free (name);
1838   return TRUE;
1839 }
1840
1841 static gboolean
1842 parse_selector_name (GtkCssScanner *scanner, GArray *names)
1843 {
1844   GQuark qname;
1845   char *name;
1846
1847   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
1848
1849   if (name == NULL)
1850     {
1851       gtk_css_provider_error_literal (scanner->provider,
1852                                       scanner,
1853                                       GTK_CSS_PROVIDER_ERROR,
1854                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1855                                       "Expected a valid name for id");
1856       return FALSE;
1857     }
1858
1859   qname = g_quark_from_string (name);
1860   g_array_append_val (names, qname);
1861   g_free (name);
1862   return TRUE;
1863 }
1864
1865 static gboolean
1866 parse_selector_pseudo_class (GtkCssScanner  *scanner,
1867                              GtkRegionFlags *region_to_modify,
1868                              GtkStateFlags  *state_to_modify)
1869 {
1870   struct {
1871     const char *name;
1872     GtkRegionFlags region_flag;
1873     GtkStateFlags state_flag;
1874   } pseudo_classes[] = {
1875     { "first",        GTK_REGION_FIRST, 0 },
1876     { "last",         GTK_REGION_LAST, 0 },
1877     { "sorted",       GTK_REGION_SORTED, 0 },
1878     { "active",       0, GTK_STATE_FLAG_ACTIVE },
1879     { "prelight",     0, GTK_STATE_FLAG_PRELIGHT },
1880     { "hover",        0, GTK_STATE_FLAG_PRELIGHT },
1881     { "selected",     0, GTK_STATE_FLAG_SELECTED },
1882     { "insensitive",  0, GTK_STATE_FLAG_INSENSITIVE },
1883     { "inconsistent", 0, GTK_STATE_FLAG_INCONSISTENT },
1884     { "focused",      0, GTK_STATE_FLAG_FOCUSED },
1885     { "focus",        0, GTK_STATE_FLAG_FOCUSED },
1886     { NULL, }
1887   }, nth_child_classes[] = {
1888     { "first",        GTK_REGION_FIRST, 0 },
1889     { "last",         GTK_REGION_LAST, 0 },
1890     { "even",         GTK_REGION_EVEN, 0 },
1891     { "odd",          GTK_REGION_ODD, 0 },
1892     { NULL, }
1893   }, *classes;
1894   guint i;
1895   char *name;
1896
1897   name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
1898   if (name == NULL)
1899     {
1900       gtk_css_provider_error_literal (scanner->provider,
1901                                       scanner,
1902                                       GTK_CSS_PROVIDER_ERROR,
1903                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1904                                       "Missing name of pseudo-class");
1905       return FALSE;
1906     }
1907
1908   if (_gtk_css_parser_try (scanner->parser, "(", TRUE))
1909     {
1910       char *function = name;
1911
1912       name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1913       if (!_gtk_css_parser_try (scanner->parser, ")", FALSE))
1914         {
1915           gtk_css_provider_error_literal (scanner->provider,
1916                                           scanner,
1917                                           GTK_CSS_PROVIDER_ERROR,
1918                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1919                                           "Missing closing bracket for pseudo-class");
1920           return FALSE;
1921         }
1922
1923       if (g_ascii_strcasecmp (function, "nth-child") != 0)
1924         {
1925           gtk_css_provider_error (scanner->provider,
1926                                   scanner,
1927                                   GTK_CSS_PROVIDER_ERROR,
1928                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
1929                                   "Unknown pseudo-class '%s(%s)'", function, name ? name : "");
1930           g_free (function);
1931           g_free (name);
1932           return FALSE;
1933         }
1934
1935       g_free (function);
1936
1937       if (name == NULL)
1938         {
1939           gtk_css_provider_error (scanner->provider,
1940                                   scanner,
1941                                   GTK_CSS_PROVIDER_ERROR,
1942                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
1943                                   "nth-child() requires an argument");
1944           return FALSE;
1945         }
1946
1947       classes = nth_child_classes;
1948     }
1949   else
1950     classes = pseudo_classes;
1951
1952   for (i = 0; classes[i].name != NULL; i++)
1953     {
1954       if (g_ascii_strcasecmp (name, classes[i].name) == 0)
1955         {
1956           if ((*region_to_modify & classes[i].region_flag) ||
1957               (*state_to_modify & classes[i].state_flag))
1958             {
1959               if (classes == nth_child_classes)
1960                 gtk_css_provider_error (scanner->provider,
1961                                         scanner,
1962                                         GTK_CSS_PROVIDER_ERROR,
1963                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
1964                                         "Duplicate pseudo-class 'nth-child(%s)'", name);
1965               else
1966                 gtk_css_provider_error (scanner->provider,
1967                                         scanner,
1968                                         GTK_CSS_PROVIDER_ERROR,
1969                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
1970                                         "Duplicate pseudo-class '%s'", name);
1971             }
1972           *region_to_modify |= classes[i].region_flag;
1973           *state_to_modify |= classes[i].state_flag;
1974
1975           g_free (name);
1976           return TRUE;
1977         }
1978     }
1979
1980   if (classes == nth_child_classes)
1981     gtk_css_provider_error (scanner->provider,
1982                             scanner,
1983                             GTK_CSS_PROVIDER_ERROR,
1984                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
1985                             "Unknown pseudo-class 'nth-child(%s)'", name);
1986   else
1987     gtk_css_provider_error (scanner->provider,
1988                             scanner,
1989                             GTK_CSS_PROVIDER_ERROR,
1990                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
1991                             "Unknown pseudo-class '%s'", name);
1992   g_free (name);
1993   return FALSE;
1994 }
1995
1996 static gboolean
1997 parse_simple_selector (GtkCssScanner *scanner,
1998                        char **name,
1999                        GArray *ids,
2000                        GArray *classes,
2001                        GtkRegionFlags *pseudo_classes,
2002                        GtkStateFlags *state)
2003 {
2004   gboolean parsed_something;
2005
2006   *name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
2007   if (*name)
2008     parsed_something = TRUE;
2009   else
2010     parsed_something = _gtk_css_parser_try (scanner->parser, "*", FALSE);
2011
2012   do {
2013       if (_gtk_css_parser_try (scanner->parser, "#", FALSE))
2014         {
2015           if (!parse_selector_name (scanner, ids))
2016             return FALSE;
2017         }
2018       else if (_gtk_css_parser_try (scanner->parser, ".", FALSE))
2019         {
2020           if (!parse_selector_class (scanner, classes))
2021             return FALSE;
2022         }
2023       else if (_gtk_css_parser_try (scanner->parser, ":", FALSE))
2024         {
2025           if (!parse_selector_pseudo_class (scanner, pseudo_classes, state))
2026             return FALSE;
2027         }
2028       else if (!parsed_something)
2029         {
2030           gtk_css_provider_error_literal (scanner->provider,
2031                                           scanner,
2032                                           GTK_CSS_PROVIDER_ERROR,
2033                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2034                                           "Expected a valid selector");
2035           return FALSE;
2036         }
2037       else
2038         break;
2039
2040       parsed_something = TRUE;
2041     }
2042   while (!_gtk_css_parser_is_eof (scanner->parser));
2043
2044   _gtk_css_parser_skip_whitespace (scanner->parser);
2045   return TRUE;
2046 }
2047
2048 static GtkCssSelector *
2049 parse_selector (GtkCssScanner *scanner)
2050 {
2051   GtkCssSelector *selector = NULL;
2052
2053   do {
2054       char *name = NULL;
2055       GArray *ids = g_array_new (TRUE, FALSE, sizeof (GQuark));
2056       GArray *classes = g_array_new (TRUE, FALSE, sizeof (GQuark));
2057       GtkRegionFlags pseudo_classes = 0;
2058       GtkStateFlags state = 0;
2059       GtkCssCombinator combine = GTK_CSS_COMBINE_DESCANDANT;
2060
2061       if (selector)
2062         {
2063           if (_gtk_css_parser_try (scanner->parser, ">", TRUE))
2064             combine = GTK_CSS_COMBINE_CHILD;
2065         }
2066
2067       if (!parse_simple_selector (scanner, &name, ids, classes, &pseudo_classes, &state))
2068         {
2069           g_array_free (ids, TRUE);
2070           g_array_free (classes, TRUE);
2071           if (selector)
2072             _gtk_css_selector_free (selector);
2073           return NULL;
2074         }
2075
2076       selector = _gtk_css_selector_new (selector,
2077                                         combine,
2078                                         name,
2079                                         (GQuark *) g_array_free (ids, ids->len == 0),
2080                                         (GQuark *) g_array_free (classes, classes->len == 0),
2081                                         pseudo_classes,
2082                                         state);
2083       g_free (name);
2084     }
2085   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2086          !_gtk_css_parser_begins_with (scanner->parser, ',') &&
2087          !_gtk_css_parser_begins_with (scanner->parser, '{'));
2088
2089   return selector;
2090 }
2091
2092 static GSList *
2093 parse_selector_list (GtkCssScanner *scanner)
2094 {
2095   GSList *selectors = NULL;
2096
2097   do {
2098       GtkCssSelector *select = parse_selector (scanner);
2099
2100       if (select == NULL)
2101         {
2102           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2103           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2104           return NULL;
2105         }
2106
2107       selectors = g_slist_prepend (selectors, select);
2108     }
2109   while (_gtk_css_parser_try (scanner->parser, ",", TRUE));
2110
2111   return selectors;
2112 }
2113
2114 static void
2115 parse_declaration (GtkCssScanner *scanner,
2116                    GtkCssRuleset *ruleset)
2117 {
2118   const GtkStyleProperty *property;
2119   char *name;
2120
2121   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2122   if (name == NULL)
2123     goto check_for_semicolon;
2124
2125   property = _gtk_style_property_lookup (name);
2126   if (property == NULL && name[0] != '-')
2127     {
2128       gtk_css_provider_error (scanner->provider,
2129                               scanner,
2130                               GTK_CSS_PROVIDER_ERROR,
2131                               GTK_CSS_PROVIDER_ERROR_NAME,
2132                               "'%s' is not a valid property name",
2133                               name);
2134       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2135       g_free (name);
2136       return;
2137     }
2138
2139   if (!_gtk_css_parser_try (scanner->parser, ":", TRUE))
2140     {
2141       gtk_css_provider_invalid_token (scanner->provider, scanner, "':'");
2142       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2143       g_free (name);
2144       return;
2145     }
2146
2147   if (property)
2148     {
2149       GValue *val;
2150
2151       g_free (name);
2152
2153       val = g_slice_new0 (GValue);
2154       g_value_init (val, property->pspec->value_type);
2155
2156       if (_gtk_style_property_parse_value (property,
2157                                            val,
2158                                            scanner->parser,
2159                                            gtk_css_scanner_get_base_url (scanner)))
2160         {
2161           if (_gtk_css_parser_begins_with (scanner->parser, ';') ||
2162               _gtk_css_parser_begins_with (scanner->parser, '}') ||
2163               _gtk_css_parser_is_eof (scanner->parser))
2164             {
2165               gtk_css_ruleset_add (ruleset, property, val);
2166             }
2167           else
2168             {
2169               gtk_css_provider_error_literal (scanner->provider,
2170                                               scanner,
2171                                               GTK_CSS_PROVIDER_ERROR,
2172                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
2173                                               "Junk at end of value");
2174               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2175               g_value_unset (val);
2176               g_slice_free (GValue, val);
2177               return;
2178             }
2179         }
2180       else
2181         {
2182           g_value_unset (val);
2183           g_slice_free (GValue, val);
2184           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2185           return;
2186         }
2187     }
2188   else if (name[0] == '-')
2189     {
2190       char *value_str;
2191
2192       value_str = _gtk_css_parser_read_value (scanner->parser);
2193       if (value_str)
2194         {
2195           GValue *val;
2196
2197           val = g_slice_new0 (GValue);
2198           g_value_init (val, G_TYPE_STRING);
2199           g_value_take_string (val, value_str);
2200
2201           gtk_css_ruleset_add_style (ruleset, name, val);
2202         }
2203       else
2204         {
2205           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2206           return;
2207         }
2208     }
2209   else
2210     g_free (name);
2211
2212 check_for_semicolon:
2213   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2214     {
2215       if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2216           !_gtk_css_parser_is_eof (scanner->parser))
2217         {
2218           gtk_css_provider_error_literal (scanner->provider,
2219                                           scanner,
2220                                           GTK_CSS_PROVIDER_ERROR,
2221                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2222                                           "Expected semicolon");
2223           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2224         }
2225     }
2226 }
2227
2228 static void
2229 parse_declarations (GtkCssScanner *scanner,
2230                     GtkCssRuleset *ruleset)
2231 {
2232   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2233          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2234     {
2235       parse_declaration (scanner, ruleset);
2236     }
2237 }
2238
2239 static void
2240 parse_ruleset (GtkCssScanner *scanner)
2241 {
2242   GSList *selectors;
2243   GtkCssRuleset ruleset = { 0, };
2244
2245   selectors = parse_selector_list (scanner);
2246   if (selectors == NULL)
2247     return;
2248
2249   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2250     {
2251       gtk_css_provider_error_literal (scanner->provider,
2252                                       scanner,
2253                                       GTK_CSS_PROVIDER_ERROR,
2254                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2255                                       "expected '{' after selectors");
2256       _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2257       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2258       return;
2259     }
2260
2261   parse_declarations (scanner, &ruleset);
2262
2263   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2264     {
2265       gtk_css_provider_error_literal (scanner->provider,
2266                                       scanner,
2267                                       GTK_CSS_PROVIDER_ERROR,
2268                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2269                                       "expected '}' after declarations");
2270       if (!_gtk_css_parser_is_eof (scanner->parser))
2271         {
2272           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2273           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2274           gtk_css_ruleset_clear (&ruleset);
2275           return;
2276         }
2277     }
2278
2279   css_provider_commit (scanner->provider, selectors, &ruleset);
2280   gtk_css_ruleset_clear (&ruleset);
2281 }
2282
2283 static void
2284 parse_statement (GtkCssScanner *scanner)
2285 {
2286   if (_gtk_css_parser_begins_with (scanner->parser, '@'))
2287     parse_at_keyword (scanner);
2288   else
2289     parse_ruleset (scanner);
2290 }
2291
2292 static void
2293 parse_stylesheet (GtkCssScanner *scanner)
2294 {
2295   _gtk_css_parser_skip_whitespace (scanner->parser);
2296
2297   while (!_gtk_css_parser_is_eof (scanner->parser))
2298     {
2299       if (_gtk_css_parser_try (scanner->parser, "<!--", TRUE) ||
2300           _gtk_css_parser_try (scanner->parser, "-->", TRUE))
2301         continue;
2302
2303       parse_statement (scanner);
2304     }
2305 }
2306
2307 static int
2308 gtk_css_provider_compare_rule (gconstpointer a_,
2309                                gconstpointer b_)
2310 {
2311   const GtkCssRuleset *a = (const GtkCssRuleset *) a_;
2312   const GtkCssRuleset *b = (const GtkCssRuleset *) b_;
2313   int compare;
2314
2315   compare = _gtk_css_selector_compare (a->selector, b->selector);
2316   if (compare != 0)
2317     return compare;
2318
2319   /* compare pointers in array to ensure a stable sort */
2320   if (a_ < b_)
2321     return -1;
2322
2323   if (a_ > b_)
2324     return 1;
2325
2326   return 0;
2327 }
2328
2329 static void
2330 gtk_css_provider_postprocess (GtkCssProvider *css_provider)
2331 {
2332   GtkCssProviderPrivate *priv = css_provider->priv;
2333
2334   g_array_sort (priv->rulesets, gtk_css_provider_compare_rule);
2335 }
2336
2337 static gboolean
2338 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
2339                                 GtkCssScanner  *parent,
2340                                 GFile          *file,
2341                                 const char     *data,
2342                                 gsize           length,
2343                                 GError        **error)
2344 {
2345   GtkCssScanner *scanner;
2346   gulong error_handler;
2347   char *free_data = NULL;
2348
2349   if (error)
2350     error_handler = g_signal_connect (css_provider,
2351                                       "parsing-error",
2352                                       G_CALLBACK (gtk_css_provider_propagate_error),
2353                                       error);
2354   else
2355     error_handler = 0; /* silence gcc */
2356
2357   if (data == NULL)
2358     {
2359       GError *load_error = NULL;
2360
2361       if (g_file_load_contents (file, NULL,
2362                                 &free_data, &length,
2363                                 NULL, &load_error))
2364         {
2365           data = free_data;
2366         }
2367       else
2368         {
2369           if (parent)
2370             {
2371               gtk_css_provider_error (css_provider,
2372                                       parent,
2373                                       GTK_CSS_PROVIDER_ERROR,
2374                                       GTK_CSS_PROVIDER_ERROR_IMPORT,
2375                                       "Failed to import: %s",
2376                                       load_error->message);
2377               g_error_free (load_error);
2378             }
2379           else
2380             {
2381               gtk_css_provider_take_error_full (css_provider,
2382                                                 file,
2383                                                 0, 0,
2384                                                 load_error);
2385             }
2386         }
2387     }
2388
2389   if (data)
2390     {
2391       scanner = gtk_css_scanner_new (css_provider, parent, file, data, length);
2392
2393       parse_stylesheet (scanner);
2394
2395       gtk_css_scanner_destroy (scanner);
2396
2397       if (parent == NULL)
2398         gtk_css_provider_postprocess (css_provider);
2399     }
2400
2401   g_free (free_data);
2402
2403   if (error)
2404     {
2405       g_signal_handler_disconnect (css_provider, error_handler);
2406
2407       if (*error)
2408         {
2409           /* We clear all contents from the provider for backwards compat reasons */
2410           gtk_css_provider_reset (css_provider);
2411           return FALSE;
2412         }
2413     }
2414
2415   return TRUE;
2416 }
2417
2418 /**
2419  * gtk_css_provider_load_from_data:
2420  * @css_provider: a #GtkCssProvider
2421  * @data: (array length=length) (element-type guint8): CSS data loaded in memory
2422  * @length: the length of @data in bytes, or -1 for NUL terminated strings
2423  * @error: (out) (allow-none): return location for a #GError, or %NULL
2424  *
2425  * Loads @data into @css_provider, making it clear any previously loaded
2426  * information.
2427  *
2428  * Returns: %TRUE if the data could be loaded.
2429  **/
2430 gboolean
2431 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2432                                  const gchar     *data,
2433                                  gssize           length,
2434                                  GError         **error)
2435 {
2436   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2437   g_return_val_if_fail (data != NULL, FALSE);
2438
2439   if (length < 0)
2440     length = strlen (data);
2441
2442   gtk_css_provider_reset (css_provider);
2443
2444   return gtk_css_provider_load_internal (css_provider, NULL, NULL, data, length, error);
2445 }
2446
2447 /**
2448  * gtk_css_provider_load_from_file:
2449  * @css_provider: a #GtkCssProvider
2450  * @file: #GFile pointing to a file to load
2451  * @error: (out) (allow-none): return location for a #GError, or %NULL
2452  *
2453  * Loads the data contained in @file into @css_provider, making it
2454  * clear any previously loaded information.
2455  *
2456  * Returns: %TRUE if the data could be loaded.
2457  **/
2458 gboolean
2459 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2460                                  GFile           *file,
2461                                  GError         **error)
2462 {
2463   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2464   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2465
2466   gtk_css_provider_reset (css_provider);
2467
2468   return gtk_css_provider_load_internal (css_provider, NULL, file, NULL, 0, error);
2469 }
2470
2471 /**
2472  * gtk_css_provider_load_from_path:
2473  * @css_provider: a #GtkCssProvider
2474  * @path: the path of a filename to load, in the GLib filename encoding
2475  * @error: (out) (allow-none): return location for a #GError, or %NULL
2476  *
2477  * Loads the data contained in @path into @css_provider, making it clear
2478  * any previously loaded information.
2479  *
2480  * Returns: %TRUE if the data could be loaded.
2481  **/
2482 gboolean
2483 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2484                                  const gchar     *path,
2485                                  GError         **error)
2486 {
2487   GFile *file;
2488   gboolean result;
2489
2490   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2491   g_return_val_if_fail (path != NULL, FALSE);
2492
2493   file = g_file_new_for_path (path);
2494
2495   result = gtk_css_provider_load_from_file (css_provider, file, error);
2496
2497   g_object_unref (file);
2498
2499   return result;
2500 }
2501
2502 /**
2503  * gtk_css_provider_get_default:
2504  *
2505  * Returns the provider containing the style settings used as a
2506  * fallback for all widgets.
2507  *
2508  * Returns: (transfer none): The provider used for fallback styling.
2509  *          This memory is owned by GTK+, and you must not free it.
2510  **/
2511 GtkCssProvider *
2512 gtk_css_provider_get_default (void)
2513 {
2514   static GtkCssProvider *provider;
2515
2516   if (G_UNLIKELY (!provider))
2517     {
2518       const gchar *str =
2519         "@define-color fg_color #000; \n"
2520         "@define-color bg_color #dcdad5; \n"
2521         "@define-color text_color #000; \n"
2522         "@define-color base_color #fff; \n"
2523         "@define-color selected_bg_color #4b6983; \n"
2524         "@define-color selected_fg_color #fff; \n"
2525         "@define-color tooltip_bg_color #eee1b3; \n"
2526         "@define-color tooltip_fg_color #000; \n"
2527         "@define-color placeholder_text_color #808080; \n"
2528         "\n"
2529         "@define-color info_fg_color rgb (181, 171, 156);\n"
2530         "@define-color info_bg_color rgb (252, 252, 189);\n"
2531         "@define-color warning_fg_color rgb (173, 120, 41);\n"
2532         "@define-color warning_bg_color rgb (250, 173, 61);\n"
2533         "@define-color question_fg_color rgb (97, 122, 214);\n"
2534         "@define-color question_bg_color rgb (138, 173, 212);\n"
2535         "@define-color error_fg_color rgb (166, 38, 38);\n"
2536         "@define-color error_bg_color rgb (237, 54, 54);\n"
2537         "\n"
2538         "* {\n"
2539         "  background-color: @bg_color;\n"
2540         "  color: @fg_color;\n"
2541         "  border-color: shade (@bg_color, 0.6);\n"
2542         "  padding: 2;\n"
2543         "  border-width: 0;\n"
2544         "}\n"
2545         "\n"
2546         "*:prelight {\n"
2547         "  background-color: shade (@bg_color, 1.05);\n"
2548         "  color: shade (@fg_color, 1.3);\n"
2549         "}\n"
2550         "\n"
2551         "*:selected {\n"
2552         "  background-color: @selected_bg_color;\n"
2553         "  color: @selected_fg_color;\n"
2554         "}\n"
2555         "\n"
2556         ".expander, GtkTreeView.view.expander {\n"
2557         "  color: #fff;\n"
2558         "}\n"
2559         "\n"
2560         ".expander:prelight,\n"
2561         "GtkTreeView.view.expander:selected:prelight {\n"
2562         "  color: @text_color;\n"
2563         "}\n"
2564         "\n"
2565         ".expander:active {\n"
2566         "  transition: 200ms linear;\n"
2567         "}\n"
2568         "\n"
2569         "*:insensitive {\n"
2570         "  border-color: shade (@bg_color, 0.7);\n"
2571         "  background-color: shade (@bg_color, 0.9);\n"
2572         "  color: shade (@bg_color, 0.7);\n"
2573         "}\n"
2574         "\n"
2575         ".view {\n"
2576         "  border-width: 0;\n"
2577         "  border-radius: 0;\n"
2578         "  background-color: @base_color;\n"
2579         "  color: @text_color;\n"
2580         "}\n"
2581         ".view:selected {\n"
2582         "  background-color: shade (@bg_color, 0.9);\n"
2583         "  color: @fg_color;\n"
2584         "}\n"
2585         "\n"
2586         ".view:selected:focused {\n"
2587         "  background-color: @selected_bg_color;\n"
2588         "  color: @selected_fg_color;\n"
2589         "}\n"
2590         "\n"
2591         ".view column:sorted row,\n"
2592         ".view column:sorted row:prelight {\n"
2593         "  background-color: shade (@bg_color, 0.85);\n"
2594         "}\n"
2595         "\n"
2596         ".view column:sorted row:nth-child(odd),\n"
2597         ".view column:sorted row:nth-child(odd):prelight {\n"
2598         "  background-color: shade (@bg_color, 0.8);\n"
2599         "}\n"
2600         "\n"
2601         ".view row,\n"
2602         ".view row:prelight {\n"
2603         "  background-color: @base_color;\n"
2604         "  color: @text_color;\n"
2605         "}\n"
2606         "\n"
2607         ".view row:nth-child(odd),\n"
2608         ".view row:nth-child(odd):prelight {\n"
2609         "  background-color: shade (@base_color, 0.93); \n"
2610         "}\n"
2611         "\n"
2612         ".view row:selected:focused {\n"
2613         "  background-color: @selected_bg_color;\n"
2614         "}\n"
2615         "\n"
2616         ".view row:selected {\n"
2617         "  background-color: darker (@bg_color);\n"
2618         "  color: @selected_fg_color;\n"
2619         "}\n"
2620         "\n"
2621         ".view.cell.trough,\n"
2622         ".view.cell.trough:hover,\n"
2623         ".view.cell.trough:selected,\n"
2624         ".view.cell.trough:selected:focused {\n"
2625         "  background-color: @bg_color;\n"
2626         "  color: @fg_color;\n"
2627         "}\n"
2628         "\n"
2629         ".view.cell.progressbar,\n"
2630         ".view.cell.progressbar:hover,\n"
2631         ".view.cell.progressbar:selected,\n"
2632         ".view.cell.progressbar:selected:focused {\n"
2633         "  background-color: @selected_bg_color;\n"
2634         "  color: @selected_fg_color;\n"
2635         "}\n"
2636         "\n"
2637         ".rubberband {\n"
2638         "  background-color: alpha (@fg_color, 0.25);\n"
2639         "  border-color: @fg_color;\n"
2640         "  border-style: solid;\n"
2641         "  border-width: 1;\n"
2642         "}\n"
2643         "\n"
2644         ".tooltip {\n"
2645         "  background-color: @tooltip_bg_color; \n"
2646         "  color: @tooltip_fg_color; \n"
2647         "  border-color: @tooltip_fg_color; \n"
2648         "  border-width: 1;\n"
2649         "  border-style: solid;\n"
2650         "}\n"
2651         "\n"
2652         ".button,\n"
2653         ".slider {\n"
2654         "  border-style: outset; \n"
2655         "  border-width: 2; \n"
2656         "}\n"
2657         "\n"
2658         ".button:active {\n"
2659         "  background-color: shade (@bg_color, 0.7);\n"
2660         "  border-style: inset; \n"
2661         "}\n"
2662         "\n"
2663         ".button:prelight,\n"
2664         ".slider:prelight {\n"
2665         "  background-color: @selected_bg_color;\n"
2666         "  color: @selected_fg_color;\n"
2667         "  border-color: shade (@selected_bg_color, 0.7);\n"
2668         "}\n"
2669         "\n"
2670         ".trough {\n"
2671         "  background-color: darker (@bg_color);\n"
2672         "  border-style: inset;\n"
2673         "  border-width: 1;\n"
2674         "  padding: 0;\n"
2675         "}\n"
2676         "\n"
2677         ".entry {\n"
2678         "  border-style: inset;\n"
2679         "  border-width: 2;\n"
2680         "  background-color: @base_color;\n"
2681         "  color: @text_color;\n"
2682         "}\n"
2683         "\n"
2684         ".entry:insensitive {\n"
2685         "  background-color: shade (@base_color, 0.9);\n"
2686         "  color: shade (@base_color, 0.7);\n"
2687         "}\n"
2688         ".entry:active {\n"
2689         "  background-color: #c4c2bd;\n"
2690         "  color: #000;\n"
2691         "}\n"
2692         "\n"
2693         ".progressbar,\n"
2694         ".entry.progressbar, \n"
2695         ".cell.progressbar {\n"
2696         "  background-color: @selected_bg_color;\n"
2697         "  border-color: shade (@selected_bg_color, 0.7);\n"
2698         "  color: @selected_fg_color;\n"
2699         "  border-style: outset;\n"
2700         "  border-width: 1;\n"
2701         "}\n"
2702         "\n"
2703         "GtkCheckButton:hover,\n"
2704         "GtkCheckButton:selected,\n"
2705         "GtkRadioButton:hover,\n"
2706         "GtkRadioButton:selected {\n"
2707         "  background-color: shade (@bg_color, 1.05);\n"
2708         "}\n"
2709         "\n"
2710         ".check, .radio,"
2711         ".cell.check, .cell.radio,\n"
2712         ".cell.check:hover, .cell.radio:hover {\n"
2713         "  border-style: solid;\n"
2714         "  border-width: 1;\n"
2715         "  background-color: @base_color;\n"
2716         "  border-color: @fg_color;\n"
2717         "}\n"
2718         "\n"
2719         ".check:active, .radio:active,\n"
2720         ".check:hover, .radio:hover {\n"
2721         "  background-color: @base_color;\n"
2722         "  border-color: @fg_color;\n"
2723         "  color: @text_color;\n"
2724         "}\n"
2725         "\n"
2726         ".check:selected, .radio:selected {\n"
2727         "  background-color: darker (@bg_color);\n"
2728         "  color: @selected_fg_color;\n"
2729         "  border-color: @selected_fg_color;\n"
2730         "}\n"
2731         "\n"
2732         ".check:selected:focused, .radio:selected:focused {\n"
2733         "  background-color: @selected_bg_color;\n"
2734         "}\n"
2735         "\n"
2736         ".menu.check, .menu.radio {\n"
2737         "  color: @fg_color;\n"
2738         "  border-style: none;\n"
2739         "  border-width: 0;\n"
2740         "}\n"
2741         "\n"
2742         ".popup {\n"
2743         "  border-style: outset;\n"
2744         "  border-width: 1;\n"
2745         "}\n"
2746         "\n"
2747         ".viewport {\n"
2748         "  border-style: inset;\n"
2749         "  border-width: 2;\n"
2750         "}\n"
2751         "\n"
2752         ".notebook {\n"
2753         "  border-style: outset;\n"
2754         "  border-width: 1;\n"
2755         "}\n"
2756         "\n"
2757         ".frame {\n"
2758         "  border-style: inset;\n"
2759         "  border-width: 1;\n"
2760         "}\n"
2761         "\n"
2762         "GtkScrolledWindow.frame {\n"
2763         "  padding: 0;\n"
2764         "}\n"
2765         "\n"
2766         ".menu,\n"
2767         ".menubar,\n"
2768         ".toolbar {\n"
2769         "  border-style: outset;\n"
2770         "  border-width: 1;\n"
2771         "}\n"
2772         "\n"
2773         ".menu:hover,\n"
2774         ".menubar:hover,\n"
2775         ".menu.check:hover,\n"
2776         ".menu.radio:hover {\n"
2777         "  background-color: @selected_bg_color;\n"
2778         "  color: @selected_fg_color;\n"
2779         "}\n"
2780         "\n"
2781         "GtkSpinButton.button {\n"
2782         "  border-width: 1;\n"
2783         "}\n"
2784         "\n"
2785         ".scale.slider:hover,\n"
2786         "GtkSpinButton.button:hover {\n"
2787         "  background-color: shade (@bg_color, 1.05);\n"
2788         "  border-color: shade (@bg_color, 0.8);\n"
2789         "}\n"
2790         "\n"
2791         "GtkSwitch.trough:active {\n"
2792         "  background-color: @selected_bg_color;\n"
2793         "  color: @selected_fg_color;\n"
2794         "}\n"
2795         "\n"
2796         "GtkToggleButton.button:inconsistent {\n"
2797         "  border-style: outset;\n"
2798         "  border-width: 1px;\n"
2799         "  background-color: shade (@bg_color, 0.9);\n"
2800         "  border-color: shade (@bg_color, 0.7);\n"
2801         "}\n"
2802         "\n"
2803         "GtkLabel:selected {\n"
2804         "  background-color: shade (@bg_color, 0.9);\n"
2805         "}\n"
2806         "\n"
2807         "GtkLabel:selected:focused {\n"
2808         "  background-color: @selected_bg_color;\n"
2809         "}\n"
2810         "\n"
2811         ".spinner:active {\n"
2812         "  transition: 750ms linear loop;\n"
2813         "}\n"
2814         "\n"
2815         ".info {\n"
2816         "  background-color: @info_bg_color;\n"
2817         "  color: @info_fg_color;\n"
2818         "}\n"
2819         "\n"
2820         ".warning {\n"
2821         "  background-color: @warning_bg_color;\n"
2822         "  color: @warning_fg_color;\n"
2823         "}\n"
2824         "\n"
2825         ".question {\n"
2826         "  background-color: @question_bg_color;\n"
2827         "  color: @question_fg_color;\n"
2828         "}\n"
2829         "\n"
2830         ".error {\n"
2831         "  background-color: @error_bg_color;\n"
2832         "  color: @error_fg_color;\n"
2833         "}\n"
2834         "\n"
2835         ".highlight {\n"
2836         "  background-color: @selected_bg_color;\n"
2837         "  color: @selected_fg_color;\n"
2838         "}\n"
2839         "\n"
2840         ".light-area-focus {\n"
2841         "  color: #000;\n"
2842         "}\n"
2843         "\n"
2844         ".dark-area-focus {\n"
2845         "  color: #fff;\n"
2846         "}\n"
2847         "GtkCalendar.view {\n"
2848         "  border-width: 1;\n"
2849         "  border-style: inset;\n"
2850         "  padding: 1;\n"
2851         "}\n"
2852         "\n"
2853         "GtkCalendar.view:inconsistent {\n"
2854         "  color: darker (@bg_color);\n"
2855         "}\n"
2856         "\n"
2857         "GtkCalendar.header {\n"
2858         "  background-color: @bg_color;\n"
2859         "  border-style: outset;\n"
2860         "  border-width: 2;\n"
2861         "}\n"
2862         "\n"
2863         "GtkCalendar.highlight {\n"
2864         "  border-width: 0;\n"
2865         "}\n"
2866         "\n"
2867         "GtkCalendar.button {\n"
2868         "  background-color: @bg_color;\n"
2869         "}\n"
2870         "\n"
2871         "GtkCalendar.button:hover {\n"
2872         "  background-color: lighter (@bg_color);\n"
2873         "  color: @fg_color;\n"
2874         "}\n"
2875         "\n"
2876         ".menu * {\n"
2877         "  border-width: 0;\n"
2878         "  padding: 2;\n"
2879         "}\n"
2880         "\n";
2881
2882       provider = gtk_css_provider_new ();
2883       if (!gtk_css_provider_load_from_data (provider, str, -1, NULL))
2884         {
2885           g_error ("Failed to load the internal default CSS.");
2886         }
2887     }
2888
2889   return provider;
2890 }
2891
2892 gchar *
2893 _gtk_css_provider_get_theme_dir (void)
2894 {
2895   const gchar *var;
2896   gchar *path;
2897
2898   var = g_getenv ("GTK_DATA_PREFIX");
2899
2900   if (var)
2901     path = g_build_filename (var, "share", "themes", NULL);
2902   else
2903     path = g_build_filename (GTK_DATA_PREFIX, "share", "themes", NULL);
2904
2905   return path;
2906 }
2907
2908 /**
2909  * gtk_css_provider_get_named:
2910  * @name: A theme name
2911  * @variant: (allow-none): variant to load, for example, "dark", or
2912  *     %NULL for the default
2913  *
2914  * Loads a theme from the usual theme paths
2915  *
2916  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
2917  *     This memory is owned by GTK+, and you must not free it.
2918  */
2919 GtkCssProvider *
2920 gtk_css_provider_get_named (const gchar *name,
2921                             const gchar *variant)
2922 {
2923   static GHashTable *themes = NULL;
2924   GtkCssProvider *provider;
2925   gchar *key;
2926
2927   if (G_UNLIKELY (!themes))
2928     themes = g_hash_table_new (g_str_hash, g_str_equal);
2929
2930   if (variant == NULL)
2931     key = (gchar *)name;
2932   else
2933     key = g_strconcat (name, "-", variant, NULL);
2934
2935   provider = g_hash_table_lookup (themes, key);
2936
2937   if (!provider)
2938     {
2939       const gchar *home_dir;
2940       gchar *subpath, *path = NULL;
2941
2942       if (variant)
2943         subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
2944       else
2945         subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
2946
2947       /* First look in the users home directory
2948        */
2949       home_dir = g_get_home_dir ();
2950       if (home_dir)
2951         {
2952           path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
2953
2954           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2955             {
2956               g_free (path);
2957               path = NULL;
2958             }
2959         }
2960
2961       if (!path)
2962         {
2963           gchar *theme_dir;
2964
2965           theme_dir = _gtk_css_provider_get_theme_dir ();
2966           path = g_build_filename (theme_dir, name, subpath, NULL);
2967           g_free (theme_dir);
2968
2969           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2970             {
2971               g_free (path);
2972               path = NULL;
2973             }
2974         }
2975
2976       g_free (subpath);
2977
2978       if (path)
2979         {
2980           provider = gtk_css_provider_new ();
2981
2982           if (!gtk_css_provider_load_from_path (provider, path, NULL))
2983             {
2984               g_object_unref (provider);
2985               provider = NULL;
2986             }
2987           else
2988             g_hash_table_insert (themes, g_strdup (key), provider);
2989
2990           g_free (path);
2991         }
2992     }
2993
2994   if (key != name)
2995     g_free (key);
2996
2997   return provider;
2998 }
2999
3000 static int
3001 compare_properties (gconstpointer a, gconstpointer b)
3002 {
3003   return strcmp (((const GtkStyleProperty *) a)->pspec->name,
3004                  ((const GtkStyleProperty *) b)->pspec->name);
3005 }
3006
3007 static void
3008 gtk_css_ruleset_print (const GtkCssRuleset *ruleset,
3009                        GString             *str)
3010 {
3011   GList *keys, *walk;
3012
3013   _gtk_css_selector_print (ruleset->selector, str);
3014
3015   g_string_append (str, " {\n");
3016
3017   if (ruleset->style)
3018     {
3019       keys = g_hash_table_get_keys (ruleset->style);
3020       /* so the output is identical for identical selector styles */
3021       keys = g_list_sort (keys, compare_properties);
3022
3023       for (walk = keys; walk; walk = walk->next)
3024         {
3025           GtkStyleProperty *prop = walk->data;
3026           const GValue *value = g_hash_table_lookup (ruleset->style, prop);
3027
3028           g_string_append (str, "  ");
3029           g_string_append (str, prop->pspec->name);
3030           g_string_append (str, ": ");
3031           _gtk_style_property_print_value (prop, value, str);
3032           g_string_append (str, ";\n");
3033         }
3034
3035       g_list_free (keys);
3036     }
3037
3038   if (ruleset->widget_style)
3039     {
3040       keys = g_hash_table_get_keys (ruleset->widget_style);
3041       /* so the output is identical for identical selector styles */
3042       keys = g_list_sort (keys, (GCompareFunc) strcmp);
3043
3044       for (walk = keys; walk; walk = walk->next)
3045         {
3046           const char *name = walk->data;
3047           const GValue *value = g_hash_table_lookup (ruleset->widget_style, (gpointer) name);
3048
3049           g_string_append (str, "  ");
3050           g_string_append (str, name);
3051           g_string_append (str, ": ");
3052           g_string_append (str, g_value_get_string (value));
3053           g_string_append (str, ";\n");
3054         }
3055
3056       g_list_free (keys);
3057     }
3058
3059   g_string_append (str, "}\n");
3060 }
3061
3062 static void
3063 gtk_css_provider_print_colors (GHashTable *colors,
3064                                GString    *str)
3065 {
3066   GList *keys, *walk;
3067   char *s;
3068
3069   keys = g_hash_table_get_keys (colors);
3070   /* so the output is identical for identical styles */
3071   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3072
3073   for (walk = keys; walk; walk = walk->next)
3074     {
3075       const char *name = walk->data;
3076       GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
3077
3078       g_string_append (str, "@define-color ");
3079       g_string_append (str, name);
3080       g_string_append (str, " ");
3081       s = gtk_symbolic_color_to_string (symbolic);
3082       g_string_append (str, s);
3083       g_free (s);
3084       g_string_append (str, ";\n");
3085     }
3086
3087   g_list_free (keys);
3088 }
3089
3090 /**
3091  * gtk_css_provider_to_string:
3092  * @provider: the provider to write to a string
3093  *
3094  * Convertes the @provider into a string representation in CSS
3095  * format.
3096  *
3097  * Using gtk_css_provider_load_from_data() with the return value
3098  * from this function on a new provider created with
3099  * gtk_css_provider_new() will basicallu create a duplicate of
3100  * this @provider.
3101  *
3102  * Returns: a new string representing the @provider.
3103  **/
3104 char *
3105 gtk_css_provider_to_string (GtkCssProvider *provider)
3106 {
3107   GtkCssProviderPrivate *priv;
3108   GString *str;
3109   guint i;
3110
3111   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
3112
3113   priv = provider->priv;
3114
3115   str = g_string_new ("");
3116
3117   gtk_css_provider_print_colors (priv->symbolic_colors, str);
3118
3119   for (i = 0; i < priv->rulesets->len; i++)
3120     {
3121       if (i > 0)
3122         g_string_append (str, "\n");
3123       gtk_css_ruleset_print (&g_array_index (priv->rulesets, GtkCssRuleset, i), str);
3124     }
3125
3126   return g_string_free (str, FALSE);
3127 }
3128