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 "gtkcssstringfuncsprivate.h"
  31 #include "gtksymboliccolor.h"
  32 #include "gtkstyleprovider.h"
  33 #include "gtkstylecontextprivate.h"
  34 #include "gtkbindings.h"
  35 #include "gtkmarshalers.h"
  36 #include "gtkprivate.h"
  37 #include "gtkintl.h"
  38
  39 /**
  40  * SECTION:gtkcssprovider
  41  * @Short_description: CSS-like styling for widgets
  42  * @Title: GtkCssProvider
  43  * @See_also: #GtkStyleContext, #GtkStyleProvider
  44  *
  45  * GtkCssProvider is an object implementing the #GtkStyleProvider interface.
  46  * It is able to parse <ulink url="http://www.w3.org/TR/CSS2">CSS</ulink>-like
  47  * input in order to style widgets.
  48  *
  49  * <refsect2 id="gtkcssprovider-files">
  50  * <title>Default files</title>
  51  * <para>
  52  * An application can cause GTK+ to parse a specific CSS style sheet by
  53  * calling gtk_css_provider_load_from_file() and adding the provider with
  54  * gtk_style_context_add_provider() or gtk_style_context_add_provider_for_screen().
  55  * In addition, certain files will be read when GTK+ is initialized. First,
  56  * the file <filename><envar>$XDG_CONFIG_HOME</envar>/gtk-3.0/gtk.css</filename>
  57  * is loaded if it exists. Then, GTK+ tries to load
  58  * <filename><envar>$HOME</envar>/.themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  59  * falling back to
  60  * <filename><replaceable>datadir</replaceable>/share/themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  61  * where <replaceable>theme-name</replaceable> is the name of the current theme
  62  * (see the #GtkSettings:gtk-theme-name setting) and <replaceable>datadir</replaceable>
  63  * is the prefix configured when GTK+ was compiled, unless overridden by the
  64  * <envar>GTK_DATA_PREFIX</envar> environment variable.
  65  * </para>
  66  * </refsect2>
  67  * <refsect2 id="gtkcssprovider-stylesheets">
  68  * <title>Style sheets</title>
  69  * <para>
  70  * The basic structure of the style sheets understood by this provider is
  71  * a series of statements, which are either rule sets or '@-rules', separated
  72  * by whitespace.
  73  * </para>
  74  * <para>
  75  * A rule set consists of a selector and a declaration block, which is
  76  * a series of declarations enclosed in curly braces ({ and }). The
  77  * declarations are separated by semicolons (;). Multiple selectors can
  78  * share the same declaration block, by putting all the separators in
  79  * front of the block, separated by commas.
  80  * </para>
  81  * <example><title>A rule set with two selectors</title>
  82  * <programlisting language="text">
  83  * GtkButton, GtkEntry {
  84  *     color: &num;ff00ea;
  85  *     font: Comic Sans 12
  86  * }
  87  * </programlisting>
  88  * </example>
  89  * </refsect2>
  90  * <refsect2 id="gtkcssprovider-selectors">
  91  * <title>Selectors</title>
  92  * <para>
  93  * Selectors work very similar to the way they do in CSS, with widget class
  94  * names taking the role of element names, and widget names taking the role
  95  * of IDs. When used in a selector, widget names must be prefixed with a
  96  * '&num;' character. The '*' character represents the so-called universal
  97  * selector, which matches any widget.
  98  * </para>
  99  * <para>
 100  * To express more complicated situations, selectors can be combined in
 101  * various ways:
 102  * <itemizedlist>
 103  * <listitem><para>To require that a widget satisfies several conditions,
 104  *   combine several selectors into one by concatenating them. E.g.
 105  *   <literal>GtkButton&num;button1</literal> matches a GtkButton widget
 106  *   with the name button1.</para></listitem>
 107  * <listitem><para>To only match a widget when it occurs inside some other
 108  *   widget, write the two selectors after each other, separated by whitespace.
 109  *   E.g. <literal>GtkToolBar GtkButton</literal> matches GtkButton widgets
 110  *   that occur inside a GtkToolBar.</para></listitem>
 111  * <listitem><para>In the previous example, the GtkButton is matched even
 112  *   if it occurs deeply nested inside the toolbar. To restrict the match
 113  *   to direct children of the parent widget, insert a '>' character between
 114  *   the two selectors. E.g. <literal>GtkNotebook > GtkLabel</literal> matches
 115  *   GtkLabel widgets that are direct children of a GtkNotebook.</para></listitem>
 116  * </itemizedlist>
 117  * </para>
 118  * <example>
 119  * <title>Widget classes and names in selectors</title>
 120  * <programlisting language="text">
 121  * /&ast; Theme labels that are descendants of a window &ast;/
 122  * GtkWindow GtkLabel {
 123  *     background-color: &num;898989
 124  * }
 125  *
 126  * /&ast; Theme notebooks, and anything that's within these &ast;/
 127  * GtkNotebook {
 128  *     background-color: &num;a939f0
 129  * }
 130  *
 131  * /&ast; Theme combo boxes, and entries that
 132  *  are direct children of a notebook &ast;/
 133  * GtkComboBox,
 134  * GtkNotebook > GtkEntry {
 135  *     color: @fg_color;
 136  *     background-color: &num;1209a2
 137  * }
 138  *
 139  * /&ast; Theme any widget within a GtkBin &ast;/
 140  * GtkBin * {
 141  *     font-name: Sans 20
 142  * }
 143  *
 144  * /&ast; Theme a label named title-label &ast;/
 145  * GtkLabel&num;title-label {
 146  *     font-name: Sans 15
 147  * }
 148  *
 149  * /&ast; Theme any widget named main-entry &ast;/
 150  * &num;main-entry {
 151  *     background-color: &num;f0a810
 152  * }
 153  * </programlisting>
 154  * </example>
 155  * <para>
 156  * Widgets may also define style classes, which can be used for matching.
 157  * When used in a selector, style classes must be prefixed with a '.'
 158  * character.
 159  * </para>
 160  * <para>
 161  * Refer to the documentation of individual widgets to learn which
 162  * style classes they define and see <xref linkend="gtkstylecontext-classes"/>
 163  * for a list of all style classes used by GTK+ widgets.
 164  * </para>
 165  * <para>
 166  * Note that there is some ambiguity in the selector syntax when it comes
 167  * to differentiation widget class names from regions. GTK+ currently treats
 168  * a string as a widget class name if it contains any uppercase characters
 169  * (which should work for more widgets with names like GtkLabel).
 170  * </para>
 171  * <example>
 172  * <title>Style classes in selectors</title>
 173  * <programlisting language="text">
 174  * /&ast; Theme all widgets defining the class entry &ast;/
 175  * .entry {
 176  *     color: &num;39f1f9;
 177  * }
 178  *
 179  * /&ast; Theme spinbuttons' entry &ast;/
 180  * GtkSpinButton.entry {
 181  *     color: &num;900185
 182  * }
 183  * </programlisting>
 184  * </example>
 185  * <para>
 186  * In complicated widgets like e.g. a GtkNotebook, it may be desirable
 187  * to style different parts of the widget differently. To make this
 188  * possible, container widgets may define regions, whose names
 189  * may be used for matching in selectors.
 190  * </para>
 191  * <para>
 192  * Some containers allow to further differentiate between regions by
 193  * applying so-called pseudo-classes to the region. For example, the
 194  * tab region in GtkNotebook allows to single out the first or last
 195  * tab by using the :first-child or :last-child pseudo-class.
 196  * When used in selectors, pseudo-classes must be prefixed with a
 197  * ':' character.
 198  * </para>
 199  * <para>
 200  * Refer to the documentation of individual widgets to learn which
 201  * regions and pseudo-classes they define and see
 202  * <xref linkend="gtkstylecontext-classes"/> for a list of all regions
 203  * used by GTK+ widgets.
 204  * </para>
 205  * <example>
 206  * <title>Regions in selectors</title>
 207  * <programlisting language="text">
 208  * /&ast; Theme any label within a notebook &ast;/
 209  * GtkNotebook GtkLabel {
 210  *     color: &num;f90192;
 211  * }
 212  *
 213  * /&ast; Theme labels within notebook tabs &ast;/
 214  * GtkNotebook tab GtkLabel {
 215  *     color: &num;703910;
 216  * }
 217  *
 218  * /&ast; Theme labels in the any first notebook
 219  *  tab, both selectors are equivalent &ast;/
 220  * GtkNotebook tab:nth-child(first) GtkLabel,
 221  * GtkNotebook tab:first-child GtkLabel {
 222  *     color: &num;89d012;
 223  * }
 224  * </programlisting>
 225  * </example>
 226  * <para>
 227  * Another use of pseudo-classes is to match widgets depending on their
 228  * state. This is conceptually similar to the :hover, :active or :focus
 229  * pseudo-classes in CSS. The available pseudo-classes for widget states
 230  * are :active, :prelight (or :hover), :insensitive, :selected, :focused
 231  * and :inconsistent.
 232  * </para>
 233  * <example>
 234  * <title>Styling specific widget states</title>
 235  * <programlisting language="text">
 236  * /&ast; Theme active (pressed) buttons &ast;/
 237  * GtkButton:active {
 238  *     background-color: &num;0274d9;
 239  * }
 240  *
 241  * /&ast; Theme buttons with the mouse pointer on it,
 242  *    both are equivalent &ast;/
 243  * GtkButton:hover,
 244  * GtkButton:prelight {
 245  *     background-color: &num;3085a9;
 246  * }
 247  *
 248  * /&ast; Theme insensitive widgets, both are equivalent &ast;/
 249  * :insensitive,
 250  * *:insensitive {
 251  *     background-color: &num;320a91;
 252  * }
 253  *
 254  * /&ast; Theme selection colors in entries &ast;/
 255  * GtkEntry:selected {
 256  *     background-color: &num;56f9a0;
 257  * }
 258  *
 259  * /&ast; Theme focused labels &ast;/
 260  * GtkLabel:focused {
 261  *     background-color: &num;b4940f;
 262  * }
 263  *
 264  * /&ast; Theme inconsistent checkbuttons &ast;/
 265  * GtkCheckButton:inconsistent {
 266  *     background-color: &num;20395a;
 267  * }
 268  * </programlisting>
 269  * </example>
 270  * <para>
 271  * Widget state pseudoclasses may only apply to the last element
 272  * in a selector.
 273  * </para>
 274  * <para>
 275  * To determine the effective style for a widget, all the matching rule
 276  * sets are merged. As in CSS, rules apply by specificity, so the rules
 277  * whose selectors more closely match a widget path will take precedence
 278  * over the others.
 279  * </para>
 280  * </refsect2>
 281  * <refsect2 id="gtkcssprovider-rules">
 282  * <title>&commat; Rules</title>
 283  * <para>
 284  * GTK+'s CSS supports the &commat;import rule, in order to load another
 285  * CSS style sheet in addition to the currently parsed one.
 286  * </para>
 287  * <example>
 288  * <title>Using the &commat;import rule</title>
 289  * <programlisting language="text">
 290  * &commat;import url ("path/to/common.css");
 291  * </programlisting>
 292  * </example>
 293  * <para id="css-binding-set">
 294  * In order to extend key bindings affecting different widgets, GTK+
 295  * supports the &commat;binding-set rule to parse a set of bind/unbind
 296  * directives, see #GtkBindingSet for the supported syntax. Note that
 297  * the binding sets defined in this way must be associated with rule sets
 298  * by setting the gtk-key-bindings style property.
 299  * </para>
 300  * <para>
 301  * Customized key bindings are typically defined in a separate
 302  * <filename>gtk-keys.css</filename> CSS file and GTK+ loads this file
 303  * according to the current key theme, which is defined by the
 304  * #GtkSettings:gtk-key-theme-name setting.
 305  * </para>
 306  * <example>
 307  * <title>Using the &commat;binding rule</title>
 308  * <programlisting language="text">
 309  * &commat;binding-set binding-set1 {
 310  *   bind "&lt;alt&gt;Left" { "move-cursor" (visual-positions, -3, 0) };
 311  *   unbind "End";
 312  * };
 313  *
 314  * &commat;binding-set binding-set2 {
 315  *   bind "&lt;alt&gt;Right" { "move-cursor" (visual-positions, 3, 0) };
 316  *   bind "&lt;alt&gt;KP_space" { "delete-from-cursor" (whitespace, 1)
 317  *                          "insert-at-cursor" (" ") };
 318  * };
 319  *
 320  * GtkEntry {
 321  *   gtk-key-bindings: binding-set1, binding-set2;
 322  * }
 323  * </programlisting>
 324  * </example>
 325  * <para>
 326  * GTK+ also supports an additional &commat;define-color rule, in order
 327  * to define a color name which may be used instead of color numeric
 328  * representations. Also see the #GtkSettings:gtk-color-scheme setting
 329  * for a way to override the values of these named colors.
 330  * </para>
 331  * <example>
 332  * <title>Defining colors</title>
 333  * <programlisting language="text">
 334  * &commat;define-color bg_color &num;f9a039;
 335  *
 336  * &ast; {
 337  *     background-color: &commat;bg_color;
 338  * }
 339  * </programlisting>
 340  * </example>
 341  * </refsect2>
 342  * <refsect2 id="gtkcssprovider-symbolic-colors">
 343  * <title>Symbolic colors</title>
 344  * <para>
 345  * Besides being able to define color names, the CSS parser is also able
 346  * to read different color expressions, which can also be nested, providing
 347  * a rich language to define colors which are derived from a set of base
 348  * colors.
 349  * </para>
 350  * <example>
 351  * <title>Using symbolic colors</title>
 352  * <programlisting language="text">
 353  * &commat;define-color entry-color shade (&commat;bg_color, 0.7);
 354  *
 355  * GtkEntry {
 356  *     background-color: @entry-color;
 357  * }
 358  *
 359  * GtkEntry:focused {
 360  *     background-color: mix (&commat;entry-color,
 361  *                            shade (&num;fff, 0.5),
 362  *                            0.8);
 363  * }
 364  * </programlisting>
 365  * </example>
 366  * <para>
 367  *   The various ways to express colors in GTK+ CSS are:
 368  * </para>
 369  * <informaltable>
 370  *   <tgroup cols="3">
 371  *     <thead>
 372  *       <row>
 373  *         <entry>Syntax</entry>
 374  *         <entry>Explanation</entry>
 375  *         <entry>Examples</entry>
 376  *       </row>
 377  *     </thead>
 378  *     <tbody>
 379  *       <row>
 380  *         <entry>rgb(@r, @g, @b)</entry>
 381  *         <entry>An opaque color; @r, @g, @b can be either integers between
 382  *                0 and 255 or percentages</entry>
 383  *         <entry><literallayout>rgb(128, 10, 54)
 384  * rgb(20%, 30%, 0%)</literallayout></entry>
 385  *       </row>
 386  *       <row>
 387  *         <entry>rgba(@r, @g, @b, @a)</entry>
 388  *         <entry>A translucent color; @r, @g, @b are as in the previous row,
 389  *                @a is a floating point number between 0 and 1</entry>
 390  *         <entry><literallayout>rgba(255, 255, 0, 0.5)</literallayout></entry>
 391  *       </row>
 392  *       <row>
 393  *         <entry>&num;@xxyyzz</entry>
 394  *         <entry>An opaque color; @xx, @yy, @zz are hexadecimal numbers
 395  *                specifying @r, @g, @b variants with between 1 and 4
 396  *                hexadecimal digits per component are allowed</entry>
 397  *         <entry><literallayout>&num;ff12ab
 398  * &num;f0c</literallayout></entry>
 399  *       </row>
 400  *       <row>
 401  *         <entry>&commat;name</entry>
 402  *         <entry>Reference to a color that has been defined with
 403  *                &commat;define-color
 404  *         </entry>
 405  *         <entry>&commat;bg_color</entry>
 406  *       </row>
 407  *       <row>
 408  *         <entry>mix(@color1, @color2, @f)</entry>
 409  *         <entry>A linear combination of @color1 and @color2. @f is a
 410  *                floating point number between 0 and 1.</entry>
 411  *         <entry><literallayout>mix(&num;ff1e0a, &commat;bg_color, 0.8)</literallayout></entry>
 412  *       </row>
 413  *       <row>
 414  *         <entry>shade(@color, @f)</entry>
 415  *         <entry>A lighter or darker variant of @color. @f is a
 416  *                floating point number.
 417  *         </entry>
 418  *         <entry>shade(&commat;fg_color, 0.5)</entry>
 419  *       </row>
 420  *       <row>
 421  *         <entry>lighter(@color)</entry>
 422  *         <entry>A lighter variant of @color</entry>
 423  *       </row>
 424  *       <row>
 425  *         <entry>darker(@color)</entry>
 426  *         <entry>A darker variant of @color</entry>
 427  *       </row>
 428  *     </tbody>
 429  *   </tgroup>
 430  * </informaltable>
 431  * </refsect2>
 432  * <refsect2 id="gtkcssprovider-gradients">
 433  * <title>Gradients</title>
 434  * <para>
 435  * Linear or radial Gradients can be used as background images.
 436  * </para>
 437  * <para>
 438  * A linear gradient along the line from (@start_x, @start_y) to
 439  * (@end_x, @end_y) is specified using the syntax
 440  * <literallayout>-gtk-gradient (linear,
 441  *               @start_x @start_y, @end_x @end_y,
 442  *               color-stop (@position, @color),
 443  *               ...)</literallayout>
 444  * where @start_x and @end_x can be either a floating point number between
 445  * 0 and 1 or one of the special values 'left', 'right' or 'center', @start_y
 446  * and @end_y can be either a floating point number between 0 and 1 or one
 447  * of the special values 'top', 'bottom' or 'center', @position is a floating
 448  * point number between 0 and 1 and @color is a color expression (see above).
 449  * The color-stop can be repeated multiple times to add more than one color
 450  * stop. 'from (@color)' and 'to (@color)' can be used as abbreviations for
 451  * color stops with position 0 and 1, respectively.
 452  * </para>
 453  * <example>
 454  * <title>A linear gradient</title>
 455  * <inlinegraphic fileref="gradient1.png" format="PNG"/>
 456  * <para>This gradient was specified with
 457  * <literallayout>-gtk-gradient (linear,
 458  *                left top, right bottom,
 459  *                from(&commat;yellow), to(&commat;blue))</literallayout></para>
 460  * </example>
 461  * <example>
 462  * <title>Another linear gradient</title>
 463  * <inlinegraphic fileref="gradient2.png" format="PNG"/>
 464  * <para>This gradient was specified with
 465  * <literallayout>-gtk-gradient (linear,
 466  *                0 0, 0 1,
 467  *                color-stop(0, &commat;yellow),
 468  *                color-stop(0.2, &commat;blue),
 469  *                color-stop(1, &num;0f0))</literallayout></para>
 470  * </example>
 471  * <para>
 472  * A radial gradient along the two circles defined by (@start_x, @start_y,
 473  * @start_radius) and (@end_x, @end_y, @end_radius) is specified using the
 474  * syntax
 475  * <literallayout>-gtk-gradient (radial,
 476  *                @start_x @start_y, @start_radius,
 477  *                @end_x @end_y, @end_radius,
 478  *                color-stop (@position, @color),
 479  *                ...)</literallayout>
 480  * where @start_radius and @end_radius are floating point numbers and
 481  * the other parameters are as before.
 482  * </para>
 483  * <example>
 484  * <title>A radial gradient</title>
 485  * <inlinegraphic fileref="gradient3.png" format="PNG"/>
 486  * <para>This gradient was specified with
 487  * <literallayout>-gtk-gradient (radial,
 488  *                center center, 0,
 489  *                center center, 1,
 490  *                from(&commat;yellow), to(&commat;green))</literallayout></para>
 491  * </example>
 492  * <example>
 493  * <title>Another radial gradient</title>
 494  * <inlinegraphic fileref="gradient4.png" format="PNG"/>
 495  * <para>This gradient was specified with
 496  * <literallayout>-gtk-gradient (radial,
 497  *                0.4 0.4, 0.1,
 498  *                0.6 0.6, 0.7,
 499  *                color-stop (0, &num;f00),
 500  *                color-stop (0.1, &num;a0f),
 501  *                color-stop (0.2, &commat;yellow),
 502  *                color-stop (1, &commat;green))</literallayout></para>
 503  * </example>
 504  * </refsect2>
 505  * <refsect2 id="gtkcssprovider-slices">
 506  * <title>Border images</title>
 507  * <para>
 508  * Images can be used in 'slices' for the purpose of creating scalable
 509  * borders.
 510  * </para>
 511  * <inlinegraphic fileref="slices.png" format="PNG"/>
 512  * <para>
 513  * The syntax for specifying border images of this kind is:
 514  * <literallayout>url(@path) @top @right @bottom @left [repeat|stretch]? [repeat|stretch]?</literallayout>
 515  * The sizes of the 'cut off' portions are specified
 516  * with the @top, @right, @bottom and @left parameters.
 517  * The 'middle' sections can be repeated or stretched to create
 518  * the desired effect, by adding the 'repeat' or 'stretch' options after
 519  * the dimensions. If two options are specified, the first one affects
 520  * the horizontal behaviour and the second one the vertical behaviour.
 521  * If only one option is specified, it affects both.
 522  * </para>
 523  * <example>
 524  * <title>A border image</title>
 525  * <inlinegraphic fileref="border1.png" format="PNG"/>
 526  * <para>This border image was specified with
 527  * <literallayout>url("gradient1.png") 10 10 10 10</literallayout>
 528  * </para>
 529  * </example>
 530  * <example>
 531  * <title>A repeating border image</title>
 532  * <inlinegraphic fileref="border2.png" format="PNG"/>
 533  * <para>This border image was specified with
 534  * <literallayout>url("gradient1.png") 10 10 10 10 repeat</literallayout>
 535  * </para>
 536  * </example>
 537  * <example>
 538  * <title>A stretched border image</title>
 539  * <inlinegraphic fileref="border3.png" format="PNG"/>
 540  * <para>This border image was specified with
 541  * <literallayout>url("gradient1.png") 10 10 10 10 stretch</literallayout>
 542  * </para>
 543  * </example>
 544  * </refsect2>
 545  * <refsect2 id="gtkcssprovider-transitions">
 546  * <para>Styles can specify transitions that will be used to create a gradual
 547  * change in the appearance when a widget state changes. The following
 548  * syntax is used to specify transitions:
 549  * <literallayout>@duration [s|ms] [linear|ease|ease-in|ease-out|ease-in-out] [loop]?</literallayout>
 550  * The @duration is the amount of time that the animation will take for
 551  * a complete cycle from start to end. If the loop option is given, the
 552  * animation will be repated until the state changes again.
 553  * The option after the duration determines the transition function from a
 554  * small set of predefined functions.
 555  * <figure><title>Linear transition</title>
 556  * <graphic fileref="linear.png" format="PNG"/>
 557  * </figure>
 558  * <figure><title>Ease transition</title>
 559  * <graphic fileref="ease.png" format="PNG"/>
 560  * </figure>
 561  * <figure><title>Ease-in-out transition</title>
 562  * <graphic fileref="ease-in-out.png" format="PNG"/>
 563  * </figure>
 564  * <figure><title>Ease-in transition</title>
 565  * <graphic fileref="ease-in.png" format="PNG"/>
 566  * </figure>
 567  * <figure><title>Ease-out transition</title>
 568  * <graphic fileref="ease-out.png" format="PNG"/>
 569  * </figure>
 570  * </para>
 571  * </refsect2>
 572  * <refsect2 id="gtkcssprovider-properties">
 573  * <title>Supported properties</title>
 574  * <para>
 575  * Properties are the part that differ the most to common CSS,
 576  * not all properties are supported (some are planned to be
 577  * supported eventually, some others are meaningless or don't
 578  * map intuitively in a widget based environment).
 579  * </para>
 580  * <para>
 581  * There is also a difference in shorthand properties, for
 582  * example in common CSS it is fine to define a font through
 583  * the different @font-family, @font-style, @font-size
 584  * properties, meanwhile in GTK+'s CSS only the canonical
 585  * @font property is supported.
 586  * </para>
 587  * <para>
 588  * The currently supported properties are:
 589  * </para>
 590  * <informaltable>
 591  *   <tgroup cols="4">
 592  *     <thead>
 593  *       <row>
 594  *         <entry>Property name</entry>
 595  *         <entry>Syntax</entry>
 596  *         <entry>Maps to</entry>
 597  *         <entry>Examples</entry>
 598  *       </row>
 599  *     </thead>
 600  *     <tbody>
 601  *       <row>
 602  *         <entry>engine</entry>
 603  *         <entry>engine-name</entry>
 604  *         <entry>#GtkThemingEngine</entry>
 605  *         <entry>engine: clearlooks;
 606  *  engine: none; /&ast; use the default (i.e. builtin) engine) &ast;/ </entry>
 607  *       </row>
 608  *       <row>
 609  *         <entry>background-color</entry>
 610  *         <entry morerows="2">color (see above)</entry>
 611  *         <entry morerows="2">#GdkRGBA</entry>
 612  *         <entry morerows="2"><literallayout>background-color: &num;fff;
 613  * color: &amp;color1;
 614  * background-color: shade (&amp;color1, 0.5);
 615  * color: mix (&amp;color1, &num;f0f, 0.8);</literallayout>
 616  *         </entry>
 617  *       </row>
 618  *       <row>
 619  *         <entry>color</entry>
 620  *       </row>
 621  *       <row>
 622  *         <entry>border-color</entry>
 623  *       </row>
 624  *       <row>
 625  *         <entry>font</entry>
 626  *         <entry>@family [@style] [@size]</entry>
 627  *         <entry>#PangoFontDescription</entry>
 628  *         <entry>font: Sans 15;</entry>
 629  *       </row>
 630  *       <row>
 631  *         <entry>margin</entry>
 632  *         <entry morerows="1"><literallayout>@width
 633  * @vertical_width @horizontal_width
 634  * @top_width @horizontal_width @bottom_width
 635  * @top_width @right_width @bottom_width @left_width</literallayout>
 636  *         </entry>
 637  *         <entry morerows="1">#GtkBorder</entry>
 638  *         <entry morerows="1"><literallayout>margin: 5;
 639  * margin: 5 10;
 640  * margin: 5 10 3;
 641  * margin: 5 10 3 5;</literallayout>
 642  *         </entry>
 643  *       </row>
 644  *       <row>
 645  *         <entry>padding</entry>
 646  *       </row>
 647  *       <row>
 648  *         <entry>background-image</entry>
 649  *         <entry><literallayout>gradient (see above) or
 650  * url(@path)</literallayout></entry>
 651  *         <entry>#cairo_pattern_t</entry>
 652  *         <entry><literallayout>-gtk-gradient (linear,
 653  *                left top, right top,
 654  *                from (&num;fff), to (&num;000));
 655  * -gtk-gradient (linear, 0.0 0.5, 0.5 1.0,
 656  *                from (&num;fff),
 657  *                color-stop (0.5, &num;f00),
 658  *                to (&num;000));
 659  * -gtk-gradient (radial,
 660  *                center center, 0.2,
 661  *                center center, 0.8,
 662  *                color-stop (0.0, &num;fff),
 663  *                color-stop (1.0, &num;000));
 664  * url ('background.png');</literallayout>
 665  *         </entry>
 666  *       </row>
 667  *       <row>
 668  *         <entry>border-width</entry>
 669  *         <entry>integer</entry>
 670  *         <entry>#gint</entry>
 671  *         <entry>border-width: 5;</entry>
 672  *       </row>
 673  *       <row>
 674  *         <entry>border-radius</entry>
 675  *         <entry>integer</entry>
 676  *         <entry>#gint</entry>
 677  *         <entry>border-radius: 5;</entry>
 678  *       </row>
 679  *       <row>
 680  *         <entry>border-style</entry>
 681  *         <entry>[none|solid|inset|outset]</entry>
 682  *         <entry>#GtkBorderStyle</entry>
 683  *         <entry>border-style: solid;</entry>
 684  *       </row>
 685  *       <row>
 686  *         <entry>border-image</entry>
 687  *         <entry><literallayout>border image (see above)</literallayout></entry>
 688  *         <entry>internal use only</entry>
 689  *         <entry><literallayout>border-image: url("/path/to/image.png") 3 4 3 4 stretch;
 690  * border-image: url("/path/to/image.png") 3 4 4 3 repeat stretch;</literallayout>
 691  *         </entry>
 692  *       </row>
 693  *       <row>
 694  *         <entry>transition</entry>
 695  *         <entry>transition (see above)</entry>
 696  *         <entry>internal use only</entry>
 697  *         <entry><literallayout>transition: 150ms ease-in-out;
 698  * transition: 1s linear loop;</literallayout>
 699  *         </entry>
 700  *       </row>
 701  *       <row>
 702  *         <entry>gtk-key-bindings</entry>
 703  *         <entry>binding set name list</entry>
 704  *         <entry>internal use only</entry>
 705  *         <entry><literallayout>gtk-bindings: binding1, binding2, ...;</literallayout>
 706  *         </entry>
 707  *       </row>
 708  *     </tbody>
 709  *   </tgroup>
 710  * </informaltable>
 711  * <para>
 712  * GtkThemingEngines can register their own, engine-specific style properties
 713  * with the function gtk_theming_engine_register_property(). These properties
 714  * can be set in CSS like other properties, using a name of the form
 715  * <literallayout>-<replaceable>namespace</replaceable>-<replaceable>name</replaceable></literallayout>, where <replaceable>namespace</replaceable> is typically
 716  * the name of the theming engine, and <replaceable>name</replaceable> is the
 717  * name of the property. Style properties that have been registered by widgets
 718  * using gtk_widget_class_install_style_property() can also be set in this
 719  * way, using the widget class name for <replaceable>namespace</replaceable>.
 720  * </para>
 721  * <example>
 722  * <title>Using engine-specific style properties</title>
 723  * <programlisting>
 724  * * {
 725  *     engine: clearlooks;
 726  *     border-radius: 4;
 727  *     -GtkPaned-handle-size: 6;
 728  *     -clearlooks-colorize-scrollbar: false;
 729  * }
 730  * </programlisting>
 731  * </example>
 732  * </refsect2>
 733  */
 734
 735 typedef struct SelectorElement SelectorElement;
 736 typedef struct SelectorPath SelectorPath;
 737 typedef struct SelectorStyleInfo SelectorStyleInfo;
 738 typedef struct _GtkCssScannerPrivate GtkCssScannerPrivate;
 739 typedef enum SelectorElementType SelectorElementType;
 740 typedef enum CombinatorType CombinatorType;
 741 typedef enum ParserScope ParserScope;
 742 typedef enum ParserSymbol ParserSymbol;
 743
 744 enum SelectorElementType {
 745   SELECTOR_TYPE_NAME,
 746   SELECTOR_NAME,
 747   SELECTOR_GTYPE,
 748   SELECTOR_REGION,
 749   SELECTOR_CLASS,
 750   SELECTOR_GLOB
 751 };
 752
 753 enum CombinatorType {
 754   COMBINATOR_DESCENDANT, /* No direct relation needed */
 755   COMBINATOR_CHILD       /* Direct child */
 756 };
 757
 758 struct SelectorElement
 759 {
 760   SelectorElementType elem_type;
 761   CombinatorType combinator;
 762
 763   union
 764   {
 765     GQuark name;
 766     GType type;
 767
 768     struct
 769     {
 770       GQuark name;
 771       GtkRegionFlags flags;
 772     } region;
 773   };
 774 };
 775
 776 struct SelectorPath
 777 {
 778   GSList *elements;
 779   GtkStateFlags state;
 780   guint ref_count;
 781 };
 782
 783 struct SelectorStyleInfo
 784 {
 785   SelectorPath *path;
 786   GHashTable *style;
 787 };
 788
 789 struct _GtkCssScannerPrivate
 790 {
 791   GFile *file;
 792   GSList *state;
 793   GSList *cur_selectors;
 794   GHashTable *cur_properties;
 795 };
 796
 797 struct _GtkCssProviderPrivate
 798 {
 799   GScanner *scanner;
 800
 801   GHashTable *symbolic_colors;
 802
 803   GPtrArray *selectors_info;
 804 };
 805
 806 enum ParserScope {
 807   SCOPE_SELECTOR,
 808   SCOPE_PSEUDO_CLASS,
 809   SCOPE_NTH_CHILD,
 810   SCOPE_DECLARATION,
 811   SCOPE_VALUE,
 812   SCOPE_BINDING_SET
 813 };
 814
 815 /* Extend GtkStateType, since these
 816  * values are also used as symbols
 817  */
 818 enum ParserSymbol {
 819   /* Scope: pseudo-class */
 820   SYMBOL_NTH_CHILD = GTK_STATE_FOCUSED + 1,
 821   SYMBOL_FIRST_CHILD,
 822   SYMBOL_LAST_CHILD,
 823   SYMBOL_SORTED_CHILD,
 824
 825   /* Scope: nth-child */
 826   SYMBOL_NTH_CHILD_EVEN,
 827   SYMBOL_NTH_CHILD_ODD,
 828   SYMBOL_NTH_CHILD_FIRST,
 829   SYMBOL_NTH_CHILD_LAST
 830 };
 831
 832 enum {
 833   PARSING_ERROR,
 834   LAST_SIGNAL
 835 };
 836
 837 static guint css_provider_signals[LAST_SIGNAL] = { 0 };
 838
 839 static void gtk_css_provider_finalize (GObject *object);
 840 static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
 841
 842 static void scanner_apply_scope (GScanner    *scanner,
 843                                  ParserScope  scope);
 844 static gboolean gtk_css_provider_load_from_path_internal (GtkCssProvider  *css_provider,
 845                                                           const gchar     *path,
 846                                                           gboolean         reset,
 847                                                           GError         **error);
 848 static void     gtk_css_provider_take_error (GtkCssProvider *provider,
 849                                              GScanner       *scanner,
 850                                              GError         *error);
 851
 852 GQuark
 853 gtk_css_provider_error_quark (void)
 854 {
 855   return g_quark_from_static_string ("gtk-css-provider-error-quark");
 856 }
 857
 858 G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
 859                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
 860                                                gtk_css_style_provider_iface_init));
 861
 862 static void
 863 gtk_css_provider_parsing_error (GtkCssProvider  *provider,
 864                                 const gchar     *path,
 865                                 guint            line,
 866                                 guint            position,
 867                                 const GError *   error)
 868 {
 869   /* Only emit a warning when we have no error handlers. This is our
 870    * default handlers. And in this case erroneous CSS files are a bug
 871    * and should be fixed.
 872    * Note that these warnings can also be triggered by a broken theme
 873    * that people installed from some weird location on the internets.
 874    */
 875   if (!g_signal_has_handler_pending (provider,
 876                                      css_provider_signals[PARSING_ERROR],
 877                                      0,
 878                                      TRUE))
 879     {
 880       g_warning ("Theme parsing error: %s:%u:%u: %s", path ? path : "<unknown>", line, position, error->message);
 881     }
 882 }
 883
 884 static void
 885 gtk_css_provider_class_init (GtkCssProviderClass *klass)
 886 {
 887   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 888
 889   /**
 890    * GtkCssProvider::parsing-error:
 891    * @provider: the provider that had a parsing error
 892    * @path: path to the parsed file or %NULL if the file cannot be
 893    *   identified or the data was not loaded from a file
 894    * @line: line in the file or data or 0 if unknown
 895    * @position: offset into the current line or 0 if unknown or the
 896    *   whole line is affected
 897    * @error: The parsing error
 898    *
 899    * Signals that a parsing error occured. the @path, @line and @position
 900    * describe the actual location of the error as accurately as possible.
 901    *
 902    * Parsing errors are never fatal, so the parsing will resume after
 903    * the error. Errors may however cause parts of the given
 904    * data or even all of it to not be parsed at all. So it is a useful idea
 905    * to check that the parsing succeeds by connecting to this signal.
 906    *
 907    * Note that this signal may be emitted at any time as the css provider
 908    * may opt to defer parsing parts or all of the input to a later time
 909    * than when a loading function was called.
 910    */
 911   css_provider_signals[PARSING_ERROR] =
 912     g_signal_new (I_("parsing-error"),
 913                   G_TYPE_FROM_CLASS (object_class),
 914                   G_SIGNAL_RUN_LAST,
 915                   G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
 916                   NULL, NULL,
 917                   _gtk_marshal_VOID__STRING_UINT_UINT_BOXED,
 918                   G_TYPE_NONE, 4,
 919                   G_TYPE_STRING, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_ERROR);
 920
 921   object_class->finalize = gtk_css_provider_finalize;
 922
 923   klass->parsing_error = gtk_css_provider_parsing_error;
 924
 925   g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
 926 }
 927
 928 static SelectorPath *
 929 selector_path_new (void)
 930 {
 931   SelectorPath *path;
 932
 933   path = g_slice_new0 (SelectorPath);
 934   path->ref_count = 1;
 935
 936   return path;
 937 }
 938
 939 static SelectorPath *
 940 selector_path_ref (SelectorPath *path)
 941 {
 942   path->ref_count++;
 943   return path;
 944 }
 945
 946 static void
 947 selector_path_unref (SelectorPath *path)
 948 {
 949   path->ref_count--;
 950
 951   if (path->ref_count > 0)
 952     return;
 953
 954   while (path->elements)
 955     {
 956       g_slice_free (SelectorElement, path->elements->data);
 957       path->elements = g_slist_delete_link (path->elements, path->elements);
 958     }
 959
 960   g_slice_free (SelectorPath, path);
 961 }
 962
 963 static void
 964 selector_path_prepend_type (SelectorPath *path,
 965                             const gchar  *type_name)
 966 {
 967   SelectorElement *elem;
 968   GType type;
 969
 970   elem = g_slice_new (SelectorElement);
 971   elem->combinator = COMBINATOR_DESCENDANT;
 972   type = g_type_from_name (type_name);
 973
 974   if (type == G_TYPE_INVALID)
 975     {
 976       elem->elem_type = SELECTOR_TYPE_NAME;
 977       elem->name = g_quark_from_string (type_name);
 978     }
 979   else
 980     {
 981       elem->elem_type = SELECTOR_GTYPE;
 982       elem->type = type;
 983     }
 984
 985   path->elements = g_slist_prepend (path->elements, elem);
 986 }
 987
 988 static void
 989 selector_path_prepend_glob (SelectorPath *path)
 990 {
 991   SelectorElement *elem;
 992
 993   elem = g_slice_new (SelectorElement);
 994   elem->elem_type = SELECTOR_GLOB;
 995   elem->combinator = COMBINATOR_DESCENDANT;
 996
 997   path->elements = g_slist_prepend (path->elements, elem);
 998 }
 999
1000 static void
1001 selector_path_prepend_region (SelectorPath   *path,
1002                               const gchar    *name,
1003                               GtkRegionFlags  flags)
1004 {
1005   SelectorElement *elem;
1006
1007   elem = g_slice_new (SelectorElement);
1008   elem->combinator = COMBINATOR_DESCENDANT;
1009   elem->elem_type = SELECTOR_REGION;
1010
1011   elem->region.name = g_quark_from_string (name);
1012   elem->region.flags = flags;
1013
1014   path->elements = g_slist_prepend (path->elements, elem);
1015 }
1016
1017 static void
1018 selector_path_prepend_name (SelectorPath *path,
1019                             const gchar  *name)
1020 {
1021   SelectorElement *elem;
1022
1023   elem = g_slice_new (SelectorElement);
1024   elem->combinator = COMBINATOR_DESCENDANT;
1025   elem->elem_type = SELECTOR_NAME;
1026
1027   elem->name = g_quark_from_string (name);
1028
1029   path->elements = g_slist_prepend (path->elements, elem);
1030 }
1031
1032 static void
1033 selector_path_prepend_class (SelectorPath *path,
1034                              const gchar  *name)
1035 {
1036   SelectorElement *elem;
1037
1038   elem = g_slice_new (SelectorElement);
1039   elem->combinator = COMBINATOR_DESCENDANT;
1040   elem->elem_type = SELECTOR_CLASS;
1041
1042   elem->name = g_quark_from_string (name);
1043
1044   path->elements = g_slist_prepend (path->elements, elem);
1045 }
1046
1047 static void
1048 selector_path_prepend_combinator (SelectorPath   *path,
1049                                   CombinatorType  combinator)
1050 {
1051   SelectorElement *elem;
1052
1053   g_assert (path->elements != NULL);
1054
1055   /* It is actually stored in the last element */
1056   elem = path->elements->data;
1057   elem->combinator = combinator;
1058 }
1059
1060 static gint
1061 selector_path_depth (SelectorPath *path)
1062 {
1063   return g_slist_length (path->elements);
1064 }
1065
1066 static SelectorStyleInfo *
1067 selector_style_info_new (SelectorPath *path)
1068 {
1069   SelectorStyleInfo *info;
1070
1071   info = g_slice_new0 (SelectorStyleInfo);
1072   info->path = selector_path_ref (path);
1073
1074   return info;
1075 }
1076
1077 static void
1078 selector_style_info_free (SelectorStyleInfo *info)
1079 {
1080   if (info->style)
1081     g_hash_table_unref (info->style);
1082
1083   if (info->path)
1084     selector_path_unref (info->path);
1085
1086   g_slice_free (SelectorStyleInfo, info);
1087 }
1088
1089 static void
1090 selector_style_info_set_style (SelectorStyleInfo *info,
1091                                GHashTable        *style)
1092 {
1093   if (info->style)
1094     g_hash_table_unref (info->style);
1095
1096   if (style)
1097     info->style = g_hash_table_ref (style);
1098   else
1099     info->style = NULL;
1100 }
1101
1102 static void
1103 property_value_free (GValue *value)
1104 {
1105   if (G_IS_VALUE (value))
1106     g_value_unset (value);
1107
1108   g_slice_free (GValue, value);
1109 }
1110
1111 static void
1112 gtk_css_scanner_reset (GScanner *scanner)
1113 {
1114   GtkCssScannerPrivate *priv = scanner->user_data;
1115
1116   g_slist_free (priv->state);
1117   priv->state = NULL;
1118
1119   g_slist_foreach (priv->cur_selectors, (GFunc) selector_path_unref, NULL);
1120   g_slist_free (priv->cur_selectors);
1121   priv->cur_selectors = NULL;
1122
1123   if (priv->cur_properties)
1124     g_hash_table_unref (priv->cur_properties);
1125
1126   priv->cur_properties = g_hash_table_new_full (g_str_hash,
1127                                                 g_str_equal,
1128                                                 (GDestroyNotify) g_free,
1129                                                 (GDestroyNotify) property_value_free);
1130
1131   scanner_apply_scope (scanner, SCOPE_SELECTOR);
1132 }
1133
1134 static void
1135 gtk_css_scanner_destroy (GScanner *scanner)
1136 {
1137   GtkCssScannerPrivate *priv = scanner->user_data;
1138
1139   gtk_css_scanner_reset (scanner);
1140
1141   if (priv->file)
1142     g_object_unref (priv->file);
1143   g_hash_table_destroy (priv->cur_properties);
1144   g_slice_free (GtkCssScannerPrivate, priv);
1145
1146   g_scanner_destroy (scanner);
1147 }
1148
1149 static GScanner *
1150 gtk_css_scanner_new (GFile       *file,
1151                      const gchar *data,
1152                      gsize        length)
1153 {
1154   GtkCssScannerPrivate *priv;
1155   GScanner *scanner;
1156
1157   scanner = g_scanner_new (NULL);
1158
1159   priv = scanner->user_data = g_slice_new0 (GtkCssScannerPrivate);
1160
1161   if (file)
1162     priv->file = g_object_ref (file);
1163
1164   priv->cur_properties = g_hash_table_new_full (g_str_hash,
1165                                                 g_str_equal,
1166                                                 (GDestroyNotify) g_free,
1167                                                 (GDestroyNotify) property_value_free);
1168
1169   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "active", GUINT_TO_POINTER (GTK_STATE_ACTIVE));
1170   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "prelight", GUINT_TO_POINTER (GTK_STATE_PRELIGHT));
1171   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "hover", GUINT_TO_POINTER (GTK_STATE_PRELIGHT));
1172   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "selected", GUINT_TO_POINTER (GTK_STATE_SELECTED));
1173   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "insensitive", GUINT_TO_POINTER (GTK_STATE_INSENSITIVE));
1174   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "inconsistent", GUINT_TO_POINTER (GTK_STATE_INCONSISTENT));
1175   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "focused", GUINT_TO_POINTER (GTK_STATE_FOCUSED));
1176   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "focus", GUINT_TO_POINTER (GTK_STATE_FOCUSED));
1177
1178   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "nth-child", GUINT_TO_POINTER (SYMBOL_NTH_CHILD));
1179   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "first-child", GUINT_TO_POINTER (SYMBOL_FIRST_CHILD));
1180   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "last-child", GUINT_TO_POINTER (SYMBOL_LAST_CHILD));
1181   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "sorted", GUINT_TO_POINTER (SYMBOL_SORTED_CHILD));
1182
1183   g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "even", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_EVEN));
1184   g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "odd", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_ODD));
1185   g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "first", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_FIRST));
1186   g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "last", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_LAST));
1187
1188   scanner_apply_scope (scanner, SCOPE_SELECTOR);
1189
1190   if (length > G_MAXUINT32)
1191     g_warning ("CSS file too large, truncating");
1192
1193   g_scanner_input_text (scanner, data, length);
1194
1195   return scanner;
1196 }
1197
1198 static void
1199 gtk_css_provider_init (GtkCssProvider *css_provider)
1200 {
1201   GtkCssProviderPrivate *priv;
1202
1203   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1204                                                            GTK_TYPE_CSS_PROVIDER,
1205                                                            GtkCssProviderPrivate);
1206
1207   priv->selectors_info = g_ptr_array_new_with_free_func ((GDestroyNotify) selector_style_info_free);
1208
1209   priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
1210                                                  (GDestroyNotify) g_free,
1211                                                  (GDestroyNotify) gtk_symbolic_color_unref);
1212 }
1213
1214 typedef struct ComparePathData ComparePathData;
1215
1216 struct ComparePathData
1217 {
1218   guint64 score;
1219   SelectorPath *path;
1220   GSList *iter;
1221 };
1222
1223 static gboolean
1224 compare_selector_element (GtkWidgetPath   *path,
1225                           guint            index,
1226                           SelectorElement *elem,
1227                           guint8          *score)
1228 {
1229   *score = 0;
1230
1231   if (elem->elem_type == SELECTOR_TYPE_NAME)
1232     {
1233       const gchar *type_name;
1234       GType resolved_type;
1235
1236       /* Resolve the type name */
1237       type_name = g_quark_to_string (elem->name);
1238       resolved_type = g_type_from_name (type_name);
1239
1240       if (resolved_type == G_TYPE_INVALID)
1241         {
1242           /* Type couldn't be resolved, so the selector
1243            * clearly doesn't affect the given widget path
1244            */
1245           return FALSE;
1246         }
1247
1248       elem->elem_type = SELECTOR_GTYPE;
1249       elem->type = resolved_type;
1250     }
1251
1252   if (elem->elem_type == SELECTOR_GTYPE)
1253     {
1254       GType type;
1255
1256       type = gtk_widget_path_iter_get_object_type (path, index);
1257
1258       if (!g_type_is_a (type, elem->type))
1259         return FALSE;
1260
1261       if (type == elem->type)
1262         *score |= 0xF;
1263       else
1264         {
1265           guint diff = g_type_depth (type) - g_type_depth (elem->type);
1266
1267           if (G_UNLIKELY (diff > 0xE))
1268             {
1269               g_warning ("Hierarchy is higher than expected.");
1270               diff = 0xE;
1271             }
1272
1273           *score = 0XF - diff;
1274         }
1275
1276       return TRUE;
1277     }
1278   else if (elem->elem_type == SELECTOR_REGION)
1279     {
1280       GtkRegionFlags flags;
1281
1282       if (!gtk_widget_path_iter_has_qregion (path, index,
1283                                              elem->region.name,
1284                                              &flags))
1285         return FALSE;
1286
1287       if (elem->region.flags != 0 &&
1288           (flags & elem->region.flags) == 0)
1289         return FALSE;
1290
1291       *score = 0xF;
1292       return TRUE;
1293     }
1294   else if (elem->elem_type == SELECTOR_GLOB)
1295     {
1296       /* Treat as lowest matching type */
1297       *score = 1;
1298       return TRUE;
1299     }
1300   else if (elem->elem_type == SELECTOR_NAME)
1301     {
1302       if (!gtk_widget_path_iter_has_qname (path, index, elem->name))
1303         return FALSE;
1304
1305       *score = 0xF;
1306       return TRUE;
1307     }
1308   else if (elem->elem_type == SELECTOR_CLASS)
1309     {
1310       if (!gtk_widget_path_iter_has_qclass (path, index, elem->name))
1311         return FALSE;
1312
1313       *score = 0xF;
1314       return TRUE;
1315     }
1316
1317   return FALSE;
1318 }
1319
1320 static guint64
1321 compare_selector (GtkWidgetPath *path,
1322                   SelectorPath  *selector)
1323 {
1324   GSList *elements = selector->elements;
1325   gboolean match = TRUE, first = TRUE, first_match = FALSE;
1326   guint64 score = 0;
1327   gint i;
1328
1329   i = gtk_widget_path_length (path) - 1;
1330
1331   while (elements && match && i >= 0)
1332     {
1333       SelectorElement *elem;
1334       guint8 elem_score;
1335
1336       elem = elements->data;
1337
1338       match = compare_selector_element (path, i, elem, &elem_score);
1339
1340       if (match && first)
1341         first_match = TRUE;
1342
1343       /* Only move on to the next index if there is no match
1344        * with the current element (whether to continue or not
1345        * handled right after in the combinator check), or a
1346        * GType or glob has just been matched.
1347        *
1348        * Region and widget names do not trigger this because
1349        * the next element in the selector path could also be
1350        * related to the same index.
1351        */
1352       if (!match ||
1353           (elem->elem_type == SELECTOR_GTYPE ||
1354            elem->elem_type == SELECTOR_GLOB))
1355         i--;
1356
1357       if (!match &&
1358           elem->elem_type != SELECTOR_TYPE_NAME &&
1359           elem->combinator == COMBINATOR_DESCENDANT)
1360         {
1361           /* With descendant combinators there may
1362            * be intermediate chidren in the hierarchy
1363            */
1364           match = TRUE;
1365         }
1366       else if (match)
1367         elements = elements->next;
1368
1369       if (match)
1370         {
1371           /* Only 4 bits are actually used */
1372           score <<= 4;
1373           score |= elem_score;
1374         }
1375
1376       first = FALSE;
1377     }
1378
1379   /* If there are pending selector
1380    * elements to compare, it's not
1381    * a match.
1382    */
1383   if (elements)
1384     match = FALSE;
1385
1386   if (!match)
1387     score = 0;
1388   else if (first_match)
1389     {
1390       /* Assign more weight to these selectors
1391        * that matched right from the first element.
1392        */
1393       score <<= 4;
1394     }
1395
1396   return score;
1397 }
1398
1399 typedef struct StylePriorityInfo StylePriorityInfo;
1400
1401 struct StylePriorityInfo
1402 {
1403   guint64 score;
1404   GHashTable *style;
1405   GtkStateFlags state;
1406 };
1407
1408 static GArray *
1409 css_provider_get_selectors (GtkCssProvider *css_provider,
1410                             GtkWidgetPath  *path)
1411 {
1412   GtkCssProviderPrivate *priv;
1413   GArray *priority_info;
1414   guint i, j;
1415
1416   priv = css_provider->priv;
1417   priority_info = g_array_new (FALSE, FALSE, sizeof (StylePriorityInfo));
1418
1419   for (i = 0; i < priv->selectors_info->len; i++)
1420     {
1421       SelectorStyleInfo *info;
1422       StylePriorityInfo new;
1423       gboolean added = FALSE;
1424       guint64 score;
1425
1426       info = g_ptr_array_index (priv->selectors_info, i);
1427       score = compare_selector (path, info->path);
1428
1429       if (score <= 0)
1430         continue;
1431
1432       new.score = score;
1433       new.style = info->style;
1434       new.state = info->path->state;
1435
1436       for (j = 0; j < priority_info->len; j++)
1437         {
1438           StylePriorityInfo *cur;
1439
1440           cur = &g_array_index (priority_info, StylePriorityInfo, j);
1441
1442           if (cur->score > new.score)
1443             {
1444               g_array_insert_val (priority_info, j, new);
1445               added = TRUE;
1446               break;
1447             }
1448         }
1449
1450       if (!added)
1451         g_array_append_val (priority_info, new);
1452     }
1453
1454   return priority_info;
1455 }
1456
1457 static void
1458 css_provider_dump_symbolic_colors (GtkCssProvider     *css_provider,
1459                                    GtkStyleProperties *props)
1460 {
1461   GtkCssProviderPrivate *priv;
1462   GHashTableIter iter;
1463   gpointer key, value;
1464
1465   priv = css_provider->priv;
1466   g_hash_table_iter_init (&iter, priv->symbolic_colors);
1467
1468   while (g_hash_table_iter_next (&iter, &key, &value))
1469     {
1470       const gchar *name;
1471       GtkSymbolicColor *color;
1472
1473       name = key;
1474       color = value;
1475
1476       gtk_style_properties_map_color (props, name, color);
1477     }
1478 }
1479
1480 static GtkStyleProperties *
1481 gtk_css_provider_get_style (GtkStyleProvider *provider,
1482                             GtkWidgetPath    *path)
1483 {
1484   GtkCssProvider *css_provider;
1485   GtkStyleProperties *props;
1486   GArray *priority_info;
1487   guint i;
1488
1489   css_provider = GTK_CSS_PROVIDER (provider);
1490   props = gtk_style_properties_new ();
1491
1492   css_provider_dump_symbolic_colors (css_provider, props);
1493   priority_info = css_provider_get_selectors (css_provider, path);
1494
1495   for (i = 0; i < priority_info->len; i++)
1496     {
1497       StylePriorityInfo *info;
1498       GHashTableIter iter;
1499       gpointer key, value;
1500
1501       info = &g_array_index (priority_info, StylePriorityInfo, i);
1502       g_hash_table_iter_init (&iter, info->style);
1503
1504       while (g_hash_table_iter_next (&iter, &key, &value))
1505         {
1506           gchar *prop = key;
1507
1508           /* Properties starting with '-' may be both widget style properties
1509            * or custom properties from the theming engine, so check whether
1510            * the type is registered or not.
1511            */
1512           if (prop[0] == '-' &&
1513               !gtk_style_properties_lookup_property (prop, NULL, NULL))
1514             continue;
1515
1516           gtk_style_properties_set_property (props, key, info->state, value);
1517         }
1518     }
1519
1520   g_array_free (priority_info, TRUE);
1521
1522   return props;
1523 }
1524
1525 static gboolean
1526 gtk_css_provider_get_style_property (GtkStyleProvider *provider,
1527                                      GtkWidgetPath    *path,
1528                                      GtkStateFlags     state,
1529                                      GParamSpec       *pspec,
1530                                      GValue           *value)
1531 {
1532   GArray *priority_info;
1533   gboolean found = FALSE;
1534   gchar *prop_name;
1535   gint i;
1536
1537   prop_name = g_strdup_printf ("-%s-%s",
1538                                g_type_name (pspec->owner_type),
1539                                pspec->name);
1540
1541   priority_info = css_provider_get_selectors (GTK_CSS_PROVIDER (provider), path);
1542
1543   for (i = priority_info->len - 1; i >= 0; i--)
1544     {
1545       StylePriorityInfo *info;
1546       GValue *val;
1547
1548       info = &g_array_index (priority_info, StylePriorityInfo, i);
1549       val = g_hash_table_lookup (info->style, prop_name);
1550
1551       if (val &&
1552           (info->state == 0 ||
1553            info->state == state ||
1554            ((info->state & state) != 0 &&
1555             (info->state & ~(state)) == 0)))
1556         {
1557           GError *error = NULL;
1558
1559           found = _gtk_css_value_from_string (value,
1560                                               NULL,
1561                                               g_value_get_string (val),
1562                                               &error);
1563
1564           if (found)
1565             break;
1566
1567           gtk_css_provider_take_error (GTK_CSS_PROVIDER (provider), NULL, error);
1568         }
1569     }
1570
1571   g_array_free (priority_info, TRUE);
1572   g_free (prop_name);
1573
1574   return found;
1575 }
1576
1577 static void
1578 gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
1579 {
1580   iface->get_style = gtk_css_provider_get_style;
1581   iface->get_style_property = gtk_css_provider_get_style_property;
1582 }
1583
1584 static void
1585 gtk_css_provider_finalize (GObject *object)
1586 {
1587   GtkCssProvider *css_provider;
1588   GtkCssProviderPrivate *priv;
1589
1590   css_provider = GTK_CSS_PROVIDER (object);
1591   priv = css_provider->priv;
1592
1593   g_ptr_array_free (priv->selectors_info, TRUE);
1594
1595   if (priv->symbolic_colors)
1596     g_hash_table_destroy (priv->symbolic_colors);
1597
1598   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1599 }
1600
1601 /**
1602  * gtk_css_provider_new:
1603  *
1604  * Returns a newly created #GtkCssProvider.
1605  *
1606  * Returns: A new #GtkCssProvider
1607  **/
1608 GtkCssProvider *
1609 gtk_css_provider_new (void)
1610 {
1611   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1612 }
1613
1614 static void
1615 gtk_css_provider_take_error (GtkCssProvider *provider,
1616                              GScanner       *scanner,
1617                              GError         *error)
1618 {
1619   char *filename;
1620   guint line, position;
1621
1622   if (scanner)
1623     {
1624       GtkCssScannerPrivate *priv = scanner->user_data;
1625       if (priv->file)
1626         filename = g_file_get_path (priv->file);
1627       else
1628         filename = NULL;
1629       line = scanner->line;
1630       position = scanner->position;
1631     }
1632   else
1633     {
1634       filename = NULL;
1635       line = 0;
1636       position = 0;
1637     }
1638
1639   g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
1640                  filename, line, position, error);
1641
1642   g_free (filename);
1643   g_error_free (error);
1644 }
1645
1646 static void
1647 gtk_css_provider_error_literal (GtkCssProvider *provider,
1648                                 GScanner       *scanner,
1649                                 GQuark          domain,
1650                                 gint            code,
1651                                 const char     *message)
1652 {
1653   gtk_css_provider_take_error (provider,
1654                                scanner,
1655                                g_error_new_literal (domain, code, message));
1656 }
1657
1658 static void
1659 gtk_css_provider_error (GtkCssProvider *provider,
1660                         GScanner       *scanner,
1661                         GQuark          domain,
1662                         gint            code,
1663                         const char     *format,
1664                         ...)  G_GNUC_PRINTF (5, 6);
1665 static void
1666 gtk_css_provider_error (GtkCssProvider *provider,
1667                         GScanner       *scanner,
1668                         GQuark          domain,
1669                         gint            code,
1670                         const char     *format,
1671                         ...)
1672 {
1673   GError *error;
1674   va_list args;
1675
1676   va_start (args, format);
1677   error = g_error_new_valist (domain, code, format, args);
1678   va_end (args);
1679
1680   gtk_css_provider_take_error (provider, scanner, error);
1681 }
1682
1683 static void
1684 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1685                                 GScanner       *scanner,
1686                                 const char     *expected)
1687 {
1688   gtk_css_provider_error (provider,
1689                           scanner,
1690                           GTK_CSS_PROVIDER_ERROR,
1691                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1692                           "expected a valid %s", expected);
1693 }
1694
1695 static void
1696 scanner_apply_scope (GScanner    *scanner,
1697                      ParserScope  scope)
1698 {
1699   g_scanner_set_scope (scanner, scope);
1700
1701   if (scope == SCOPE_VALUE)
1702     {
1703       scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_";
1704       scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_ +(),.%\t\n'/\"";
1705       scanner->config->scan_identifier_1char = TRUE;
1706     }
1707   else if (scope == SCOPE_BINDING_SET)
1708     {
1709       scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_";
1710       scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_ +(){}<>,.%\t\n'/\"";
1711       scanner->config->scan_identifier_1char = TRUE;
1712     }
1713   else if (scope == SCOPE_SELECTOR)
1714     {
1715       scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "*@";
1716       scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "-_#.";
1717       scanner->config->scan_identifier_1char = TRUE;
1718     }
1719   else if (scope == SCOPE_PSEUDO_CLASS ||
1720            scope == SCOPE_NTH_CHILD ||
1721            scope == SCOPE_DECLARATION)
1722     {
1723       scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "-_";
1724       scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "-_";
1725       scanner->config->scan_identifier_1char = FALSE;
1726     }
1727   else
1728     g_assert_not_reached ();
1729
1730   scanner->config->scan_float = FALSE;
1731   scanner->config->cpair_comment_single = NULL;
1732 }
1733
1734 static void
1735 gtk_css_scanner_push_scope (GScanner    *scanner,
1736                             ParserScope  scope)
1737 {
1738   GtkCssScannerPrivate *priv;
1739
1740   priv = scanner->user_data;
1741   priv->state = g_slist_prepend (priv->state, GUINT_TO_POINTER (scope));
1742
1743   scanner_apply_scope (scanner, scope);
1744 }
1745
1746 static void
1747 gtk_css_scanner_pop_scope (GScanner *scanner)
1748 {
1749   GtkCssScannerPrivate *priv;
1750   ParserScope scope = SCOPE_SELECTOR;
1751
1752   priv = scanner->user_data;
1753
1754   if (!priv->state)
1755     {
1756       g_warning ("Push/pop calls to parser scope aren't paired");
1757       scanner_apply_scope (scanner, SCOPE_SELECTOR);
1758       return;
1759     }
1760
1761   priv->state = g_slist_delete_link (priv->state, priv->state);
1762
1763   /* Fetch new scope */
1764   if (priv->state)
1765     scope = GPOINTER_TO_INT (priv->state->data);
1766
1767   scanner_apply_scope (scanner, scope);
1768 }
1769
1770 static void
1771 css_provider_commit (GtkCssProvider *css_provider,
1772                      GScanner       *scanner)
1773 {
1774   GtkCssScannerPrivate *scanner_priv;
1775   GtkCssProviderPrivate *priv;
1776   GSList *l;
1777
1778   priv = css_provider->priv;
1779   scanner_priv = scanner->user_data;
1780
1781   l = scanner_priv->cur_selectors;
1782
1783   if (g_hash_table_size (scanner_priv->cur_properties) == 0)
1784     return;
1785
1786   while (l)
1787     {
1788       SelectorPath *path = l->data;
1789       SelectorStyleInfo *info;
1790
1791       info = selector_style_info_new (path);
1792       selector_style_info_set_style (info, scanner_priv->cur_properties);
1793
1794       g_ptr_array_add (priv->selectors_info, info);
1795       l = l->next;
1796     }
1797 }
1798
1799 static GTokenType
1800 parse_nth_child (GtkCssProvider *css_provider,
1801                  GScanner       *scanner,
1802                  GtkRegionFlags *flags)
1803 {
1804   ParserSymbol symbol;
1805
1806   g_scanner_get_next_token (scanner);
1807
1808   if (scanner->token != G_TOKEN_SYMBOL)
1809     return G_TOKEN_SYMBOL;
1810
1811   symbol = GPOINTER_TO_INT (scanner->value.v_symbol);
1812
1813   if (symbol == SYMBOL_NTH_CHILD)
1814     {
1815       g_scanner_get_next_token (scanner);
1816
1817       if (scanner->token != G_TOKEN_LEFT_PAREN)
1818         return G_TOKEN_LEFT_PAREN;
1819
1820       gtk_css_scanner_push_scope (scanner, SCOPE_NTH_CHILD);
1821       g_scanner_get_next_token (scanner);
1822
1823       if (scanner->token != G_TOKEN_SYMBOL)
1824         return G_TOKEN_SYMBOL;
1825
1826       symbol = GPOINTER_TO_INT (scanner->value.v_symbol);
1827
1828       switch (symbol)
1829         {
1830         case SYMBOL_NTH_CHILD_EVEN:
1831           *flags = GTK_REGION_EVEN;
1832           break;
1833         case SYMBOL_NTH_CHILD_ODD:
1834           *flags = GTK_REGION_ODD;
1835           break;
1836         case SYMBOL_NTH_CHILD_FIRST:
1837           *flags = GTK_REGION_FIRST;
1838           break;
1839         case SYMBOL_NTH_CHILD_LAST:
1840           *flags = GTK_REGION_LAST;
1841           break;
1842         default:
1843           break;
1844         }
1845
1846       g_scanner_get_next_token (scanner);
1847
1848       if (scanner->token != G_TOKEN_RIGHT_PAREN)
1849         return G_TOKEN_RIGHT_PAREN;
1850
1851       gtk_css_scanner_pop_scope (scanner);
1852     }
1853   else if (symbol == SYMBOL_FIRST_CHILD)
1854     *flags = GTK_REGION_FIRST;
1855   else if (symbol == SYMBOL_LAST_CHILD)
1856     *flags = GTK_REGION_LAST;
1857   else if (symbol == SYMBOL_SORTED_CHILD)
1858     *flags = GTK_REGION_SORTED;
1859   else
1860     {
1861       *flags = 0;
1862       return G_TOKEN_SYMBOL;
1863     }
1864
1865   return G_TOKEN_NONE;
1866 }
1867
1868 static GTokenType
1869 parse_pseudo_class (GtkCssProvider *css_provider,
1870                     GScanner       *scanner,
1871                     SelectorPath   *selector)
1872 {
1873   GtkStateType state;
1874
1875   g_scanner_get_next_token (scanner);
1876
1877   if (scanner->token != G_TOKEN_SYMBOL)
1878     return G_TOKEN_SYMBOL;
1879
1880   state = GPOINTER_TO_INT (scanner->value.v_symbol);
1881
1882   switch (state)
1883     {
1884     case GTK_STATE_ACTIVE:
1885       selector->state |= GTK_STATE_FLAG_ACTIVE;
1886       break;
1887     case GTK_STATE_PRELIGHT:
1888       selector->state |= GTK_STATE_FLAG_PRELIGHT;
1889       break;
1890     case GTK_STATE_SELECTED:
1891       selector->state |= GTK_STATE_FLAG_SELECTED;
1892       break;
1893     case GTK_STATE_INSENSITIVE:
1894       selector->state |= GTK_STATE_FLAG_INSENSITIVE;
1895       break;
1896     case GTK_STATE_INCONSISTENT:
1897       selector->state |= GTK_STATE_FLAG_INCONSISTENT;
1898       break;
1899     case GTK_STATE_FOCUSED:
1900       selector->state |= GTK_STATE_FLAG_FOCUSED;
1901       break;
1902     default:
1903       return G_TOKEN_SYMBOL;
1904     }
1905
1906   return G_TOKEN_NONE;
1907 }
1908
1909 /* Parses a number of concatenated classes */
1910 static void
1911 parse_classes (SelectorPath   *path,
1912                const gchar    *str)
1913 {
1914   gchar *pos;
1915
1916   if ((pos = strchr (str, '.')) != NULL)
1917     {
1918       /* Leave the last class to the call after the loop */
1919       while (pos)
1920         {
1921           *pos = '\0';
1922           selector_path_prepend_class (path, str);
1923
1924           str = pos + 1;
1925           pos = strchr (str, '.');
1926         }
1927     }
1928
1929   selector_path_prepend_class (path, str);
1930 }
1931
1932 static gboolean
1933 is_widget_class_name (const gchar *str)
1934 {
1935   /* Do a pretty lax check here, not all
1936    * widget class names contain only CamelCase
1937    * (gtkmm widgets don't), but at least part of
1938    * the name will be CamelCase, so check for
1939    * the first uppercase char
1940    */
1941   while (*str)
1942     {
1943       if (g_ascii_isupper (*str))
1944         return TRUE;
1945
1946       str++;
1947     }
1948
1949   return FALSE;
1950 }
1951
1952 static GTokenType
1953 parse_selector (GtkCssProvider  *css_provider,
1954                 GScanner        *scanner,
1955                 SelectorPath   **selector_out)
1956 {
1957   SelectorPath *path;
1958
1959   path = selector_path_new ();
1960   *selector_out = path;
1961
1962   if (scanner->token != ':' &&
1963       scanner->token != '#' &&
1964       scanner->token != '.' &&
1965       scanner->token != G_TOKEN_IDENTIFIER)
1966     return G_TOKEN_IDENTIFIER;
1967
1968   while (scanner->token == '#' ||
1969          scanner->token == '.' ||
1970          scanner->token == G_TOKEN_IDENTIFIER)
1971     {
1972       if (scanner->token == '#' ||
1973           scanner->token == '.')
1974         {
1975           gboolean is_class;
1976           gchar *pos;
1977
1978           is_class = (scanner->token == '.');
1979
1980           g_scanner_get_next_token (scanner);
1981
1982           if (scanner->token != G_TOKEN_IDENTIFIER)
1983             return G_TOKEN_IDENTIFIER;
1984
1985           selector_path_prepend_glob (path);
1986           selector_path_prepend_combinator (path, COMBINATOR_CHILD);
1987
1988           if (is_class)
1989             parse_classes (path, scanner->value.v_identifier);
1990           else
1991             {
1992               if ((pos = strchr (scanner->value.v_identifier, '.')) != NULL)
1993                 *pos = '\0';
1994
1995               selector_path_prepend_name (path, scanner->value.v_identifier);
1996
1997               /* Parse any remaining classes */
1998               if (pos)
1999                 parse_classes (path, pos + 1);
2000             }
2001         }
2002       else if (is_widget_class_name (scanner->value.v_identifier))
2003         {
2004           gchar *pos;
2005
2006           if ((pos = strchr (scanner->value.v_identifier, '#')) != NULL ||
2007               (pos = strchr (scanner->value.v_identifier, '.')) != NULL)
2008             {
2009               gchar *type_name, *name;
2010               gboolean is_class;
2011
2012               is_class = (*pos == '.');
2013
2014               /* Widget type and name/class put together */
2015               name = pos + 1;
2016               *pos = '\0';
2017               type_name = scanner->value.v_identifier;
2018
2019               selector_path_prepend_type (path, type_name);
2020
2021               /* This is only so there is a direct relationship
2022                * between widget type and its name.
2023                */
2024               selector_path_prepend_combinator (path, COMBINATOR_CHILD);
2025
2026               if (is_class)
2027                 parse_classes (path, name);
2028               else
2029                 {
2030                   if ((pos = strchr (name, '.')) != NULL)
2031                     *pos = '\0';
2032
2033                   selector_path_prepend_name (path, name);
2034
2035                   /* Parse any remaining classes */
2036                   if (pos)
2037                     parse_classes (path, pos + 1);
2038                 }
2039             }
2040           else
2041             selector_path_prepend_type (path, scanner->value.v_identifier);
2042         }
2043       else if (_gtk_style_context_check_region_name (scanner->value.v_identifier))
2044         {
2045           GtkRegionFlags flags = 0;
2046           gchar *region_name;
2047
2048           region_name = g_strdup (scanner->value.v_identifier);
2049
2050           if (g_scanner_peek_next_token (scanner) == ':')
2051             {
2052               ParserSymbol symbol;
2053
2054               g_scanner_get_next_token (scanner);
2055               gtk_css_scanner_push_scope (scanner, SCOPE_PSEUDO_CLASS);
2056
2057               /* Check for the next token being nth-child, parse in that
2058                * case, and fallback into common state parsing if not.
2059                */
2060               if (g_scanner_peek_next_token (scanner) != G_TOKEN_SYMBOL)
2061                 return G_TOKEN_SYMBOL;
2062
2063               symbol = GPOINTER_TO_INT (scanner->next_value.v_symbol);
2064
2065               if (symbol == SYMBOL_FIRST_CHILD ||
2066                   symbol == SYMBOL_LAST_CHILD ||
2067                   symbol == SYMBOL_NTH_CHILD ||
2068                   symbol == SYMBOL_SORTED_CHILD)
2069                 {
2070                   GTokenType token;
2071
2072                   if ((token = parse_nth_child (css_provider, scanner, &flags)) != G_TOKEN_NONE)
2073                     return token;
2074
2075                   gtk_css_scanner_pop_scope (scanner);
2076                 }
2077               else
2078                 {
2079                   gtk_css_scanner_pop_scope (scanner);
2080                   selector_path_prepend_region (path, region_name, 0);
2081                   g_free (region_name);
2082                   break;
2083                 }
2084             }
2085
2086           selector_path_prepend_region (path, region_name, flags);
2087           g_free (region_name);
2088         }
2089       else if (scanner->value.v_identifier[0] == '*')
2090         selector_path_prepend_glob (path);
2091       else
2092         return G_TOKEN_IDENTIFIER;
2093
2094       g_scanner_get_next_token (scanner);
2095
2096       if (scanner->token == '>')
2097         {
2098           selector_path_prepend_combinator (path, COMBINATOR_CHILD);
2099           g_scanner_get_next_token (scanner);
2100         }
2101     }
2102
2103   if (scanner->token == ':')
2104     {
2105       /* Add glob selector if path is empty */
2106       if (selector_path_depth (path) == 0)
2107         selector_path_prepend_glob (path);
2108
2109       gtk_css_scanner_push_scope (scanner, SCOPE_PSEUDO_CLASS);
2110
2111       while (scanner->token == ':')
2112         {
2113           GTokenType token;
2114
2115           if ((token = parse_pseudo_class (css_provider, scanner, path)) != G_TOKEN_NONE)
2116             return token;
2117
2118           g_scanner_get_next_token (scanner);
2119         }
2120
2121       gtk_css_scanner_pop_scope (scanner);
2122     }
2123
2124   return G_TOKEN_NONE;
2125 }
2126
2127 static void
2128 resolve_binding_sets (const gchar *value_str,
2129                       GValue      *value)
2130 {
2131   GPtrArray *array;
2132   gchar **bindings, **str;
2133
2134   bindings = g_strsplit (value_str, ",", -1);
2135   array = g_ptr_array_new ();
2136
2137   for (str = bindings; *str; str++)
2138     {
2139       GtkBindingSet *binding_set;
2140
2141       binding_set = gtk_binding_set_find (g_strstrip (*str));
2142
2143       if (!binding_set)
2144         continue;
2145
2146       g_ptr_array_add (array, binding_set);
2147     }
2148
2149   g_value_take_boxed (value, array);
2150   g_strfreev (bindings);
2151 }
2152
2153 static GTokenType
2154 parse_rule (GtkCssProvider  *css_provider,
2155             GScanner        *scanner)
2156 {
2157   GtkCssScannerPrivate *priv;
2158   GTokenType expected_token;
2159   SelectorPath *selector;
2160
2161   priv = scanner->user_data;
2162
2163   gtk_css_scanner_push_scope (scanner, SCOPE_SELECTOR);
2164
2165   /* Handle directives */
2166   if (scanner->token == G_TOKEN_IDENTIFIER &&
2167       scanner->value.v_identifier[0] == '@')
2168     {
2169       gchar *directive;
2170
2171       directive = &scanner->value.v_identifier[1];
2172
2173       if (strcmp (directive, "define-color") == 0)
2174         {
2175           GtkSymbolicColor *color;
2176           gchar *color_name, *color_str;
2177           GError *error = NULL;
2178
2179           /* Directive is a color mapping */
2180           g_scanner_get_next_token (scanner);
2181
2182           if (scanner->token != G_TOKEN_IDENTIFIER)
2183             {
2184               gtk_css_provider_invalid_token (css_provider, scanner, "Color name");
2185               return G_TOKEN_IDENTIFIER;
2186             }
2187
2188           color_name = g_strdup (scanner->value.v_identifier);
2189           gtk_css_scanner_push_scope (scanner, SCOPE_VALUE);
2190           g_scanner_get_next_token (scanner);
2191
2192           if (scanner->token != G_TOKEN_IDENTIFIER)
2193             {
2194               gtk_css_provider_invalid_token (css_provider, scanner, "Color definition");
2195               return G_TOKEN_IDENTIFIER;
2196             }
2197
2198           color_str = g_strstrip (scanner->value.v_identifier);
2199           color = _gtk_css_parse_symbolic_color (color_str, &error);
2200           if (!color)
2201             {
2202               gtk_css_provider_take_error (css_provider, scanner, error);
2203               return G_TOKEN_IDENTIFIER;
2204             }
2205
2206           g_hash_table_insert (css_provider->priv->symbolic_colors, color_name, color);
2207
2208           gtk_css_scanner_pop_scope (scanner);
2209           g_scanner_get_next_token (scanner);
2210
2211           if (scanner->token != ';')
2212             return ';';
2213
2214           return G_TOKEN_NONE;
2215         }
2216       else if (strcmp (directive, "import") == 0)
2217         {
2218           gboolean loaded;
2219           gchar *path = NULL;
2220           GFile *base, *actual;
2221           char *dirname;
2222           GError *error = NULL;
2223
2224           gtk_css_scanner_push_scope (scanner, SCOPE_VALUE);
2225           g_scanner_get_next_token (scanner);
2226
2227           if (scanner->token == G_TOKEN_IDENTIFIER &&
2228               g_str_has_prefix (scanner->value.v_identifier, "url"))
2229             path = g_strstrip (scanner->value.v_identifier);
2230           else if (scanner->token == G_TOKEN_STRING)
2231             path = g_strstrip (scanner->value.v_string);
2232           else
2233             {
2234               gtk_css_provider_invalid_token (css_provider, scanner, "File URL");
2235               return G_TOKEN_IDENTIFIER;
2236             }
2237
2238           if (scanner->input_name)
2239             dirname = g_path_get_dirname (scanner->input_name);
2240           else
2241             dirname = g_get_current_dir ();
2242
2243           base = g_file_new_for_path (dirname);
2244           g_free (dirname);
2245
2246           actual = _gtk_css_parse_url (base, path, NULL, &error);
2247           g_object_unref (base);
2248
2249           if (actual == NULL)
2250             {
2251               gtk_css_provider_take_error (css_provider, scanner, error);
2252               return G_TOKEN_IDENTIFIER;
2253             }
2254
2255           gtk_css_scanner_pop_scope (scanner);
2256           g_scanner_get_next_token (scanner);
2257
2258           if (scanner->token != ';')
2259             {
2260               g_object_unref (actual);
2261               return ';';
2262             }
2263
2264           path = g_file_get_path (actual);
2265           g_object_unref (actual);
2266
2267           /* FIXME: Avoid recursive importing */
2268           loaded = gtk_css_provider_load_from_path_internal (css_provider, path,
2269                                                              FALSE, NULL);
2270
2271           /* Restore previous state */
2272           g_free (path);
2273
2274           if (!loaded)
2275             return G_TOKEN_IDENTIFIER;
2276           else
2277             return G_TOKEN_NONE;
2278         }
2279       else if (strcmp (directive, "binding-set") == 0)
2280         {
2281           GtkBindingSet *binding_set;
2282           gchar *binding_set_name;
2283
2284           g_scanner_get_next_token (scanner);
2285
2286           if (scanner->token != G_TOKEN_IDENTIFIER)
2287             {
2288               gtk_css_provider_invalid_token (css_provider, scanner, "Binding name");
2289               return G_TOKEN_IDENTIFIER;
2290             }
2291
2292           binding_set_name = scanner->value.v_identifier;
2293           binding_set = gtk_binding_set_find (binding_set_name);
2294
2295           if (!binding_set)
2296             {
2297               binding_set = gtk_binding_set_new (binding_set_name);
2298               binding_set->parsed = TRUE;
2299             }
2300
2301           g_scanner_get_next_token (scanner);
2302
2303           if (scanner->token != G_TOKEN_LEFT_CURLY)
2304             return G_TOKEN_LEFT_CURLY;
2305
2306           gtk_css_scanner_push_scope (scanner, SCOPE_BINDING_SET);
2307           g_scanner_get_next_token (scanner);
2308
2309           do
2310             {
2311               GTokenType ret;
2312
2313               if (scanner->token != G_TOKEN_IDENTIFIER)
2314                 {
2315                   gtk_css_provider_invalid_token (css_provider, scanner, "Binding definition");
2316                   return G_TOKEN_IDENTIFIER;
2317                 }
2318
2319               ret = gtk_binding_entry_add_signal_from_string (binding_set,
2320                                                               scanner->value.v_identifier);
2321               if (ret != G_TOKEN_NONE)
2322                 {
2323                   gtk_css_provider_invalid_token (css_provider, scanner, "Binding definition");
2324                   return ret;
2325                 }
2326
2327               g_scanner_get_next_token (scanner);
2328
2329               if (scanner->token != ';')
2330                 return ';';
2331
2332               g_scanner_get_next_token (scanner);
2333             }
2334           while (scanner->token != G_TOKEN_RIGHT_CURLY);
2335
2336           gtk_css_scanner_pop_scope (scanner);
2337           g_scanner_get_next_token (scanner);
2338
2339           return G_TOKEN_NONE;
2340         }
2341       else
2342         {
2343           gtk_css_provider_invalid_token (css_provider, scanner, "Directive");
2344           return G_TOKEN_IDENTIFIER;
2345         }
2346     }
2347
2348   expected_token = parse_selector (css_provider, scanner, &selector);
2349
2350   if (expected_token != G_TOKEN_NONE)
2351     {
2352       selector_path_unref (selector);
2353       gtk_css_provider_invalid_token (css_provider, scanner, "Selector");
2354       return expected_token;
2355     }
2356
2357   priv->cur_selectors = g_slist_prepend (priv->cur_selectors, selector);
2358
2359   while (scanner->token == ',')
2360     {
2361       g_scanner_get_next_token (scanner);
2362
2363       expected_token = parse_selector (css_provider, scanner, &selector);
2364
2365       if (expected_token != G_TOKEN_NONE)
2366         {
2367           selector_path_unref (selector);
2368           gtk_css_provider_invalid_token (css_provider, scanner, "Selector");
2369           return expected_token;
2370         }
2371
2372       priv->cur_selectors = g_slist_prepend (priv->cur_selectors, selector);
2373     }
2374
2375   gtk_css_scanner_pop_scope (scanner);
2376
2377   if (scanner->token != G_TOKEN_LEFT_CURLY)
2378     return G_TOKEN_LEFT_CURLY;
2379
2380   /* Declarations parsing */
2381   gtk_css_scanner_push_scope (scanner, SCOPE_DECLARATION);
2382
2383   g_scanner_get_next_token (scanner);
2384
2385   while (scanner->token != G_TOKEN_RIGHT_CURLY &&
2386          !g_scanner_eof (scanner))
2387     {
2388       gchar *value_str = NULL;
2389       GtkStylePropertyParser parse_func = NULL;
2390       GParamSpec *pspec = NULL;;
2391       gchar *prop;
2392
2393       if (scanner->token == ';')
2394         {
2395           g_scanner_get_next_token (scanner);
2396           continue;
2397         }
2398
2399       if (scanner->token != G_TOKEN_IDENTIFIER)
2400         {
2401           gtk_css_provider_error_literal (css_provider,
2402                                           scanner,
2403                                           GTK_CSS_PROVIDER_ERROR,
2404                                           GTK_CSS_PROVIDER_ERROR_PROPERTY_NAME,
2405                                           "Expected a valid property name");
2406           goto find_end_of_declaration;
2407         }
2408
2409       prop = g_strdup (scanner->value.v_identifier);
2410
2411       if (!gtk_style_properties_lookup_property (prop, &parse_func, &pspec) &&
2412           prop[0] != '-')
2413         {
2414           gtk_css_provider_error (css_provider,
2415                                   scanner,
2416                                   GTK_CSS_PROVIDER_ERROR,
2417                                   GTK_CSS_PROVIDER_ERROR_PROPERTY_NAME,
2418                                   "'%s' is not a valid property name",
2419                                   prop);
2420           g_free (prop);
2421           goto find_end_of_declaration;
2422         }
2423
2424       g_scanner_get_next_token (scanner);
2425
2426       if (scanner->token != ':')
2427         {
2428           g_free (prop);
2429           gtk_css_provider_invalid_token (css_provider, scanner, "':'");
2430           goto find_end_of_declaration;
2431         }
2432
2433       gtk_css_scanner_push_scope (scanner, SCOPE_VALUE);
2434       g_scanner_get_next_token (scanner);
2435
2436       if (scanner->token != G_TOKEN_IDENTIFIER)
2437         {
2438           g_free (prop);
2439           /* the error value here is hacky. But strings should be used for
2440            * strings really, so a string is not a syntax error but a broken
2441            * value for everything that we support. */
2442           gtk_css_provider_error (css_provider,
2443                                   scanner,
2444                                   GTK_CSS_PROVIDER_ERROR,
2445                                   scanner->token == G_TOKEN_STRING ? GTK_CSS_PROVIDER_ERROR_PROPERTY_VALUE
2446                                                                    : GTK_CSS_PROVIDER_ERROR_SYNTAX,
2447                                   "Not a property value");
2448           gtk_css_scanner_pop_scope (scanner);
2449           goto find_end_of_declaration;
2450         }
2451
2452       value_str = scanner->value.v_identifier;
2453       g_strchomp (value_str);
2454
2455       gtk_css_scanner_pop_scope (scanner);
2456       g_scanner_peek_next_token (scanner);
2457
2458       if (scanner->next_token != ';' &&
2459           scanner->next_token != G_TOKEN_RIGHT_CURLY &&
2460           scanner->next_token != G_TOKEN_EOF)
2461         {
2462           gtk_css_provider_invalid_token (css_provider, scanner, "';'");
2463           g_free (prop);
2464           goto find_end_of_declaration;
2465         }
2466
2467       if (pspec)
2468         {
2469           GValue *val;
2470
2471           val = g_slice_new0 (GValue);
2472           g_value_init (val, pspec->value_type);
2473
2474           if (strcmp (value_str, "none") == 0)
2475             {
2476               /* Insert the default value, so it has an opportunity
2477                * to override other style providers when merged
2478                */
2479               g_param_value_set_default (pspec, val);
2480               g_hash_table_insert (priv->cur_properties, prop, val);
2481             }
2482           else if (strcmp (prop, "gtk-key-bindings") == 0)
2483             {
2484               /* Private property holding the binding sets */
2485               resolve_binding_sets (value_str, val);
2486               g_hash_table_insert (priv->cur_properties, prop, val);
2487             }
2488           else if (pspec->value_type == G_TYPE_STRING)
2489             {
2490               g_value_set_string (val, value_str);
2491               g_hash_table_insert (priv->cur_properties, prop, val);
2492             }
2493           else if (parse_func)
2494             {
2495               GError *error = NULL;
2496
2497               if ((*parse_func) (value_str, val, &error))
2498                 g_hash_table_insert (priv->cur_properties, prop, val);
2499               else
2500                 gtk_css_provider_take_error (css_provider, scanner, error);
2501             }
2502           else
2503             {
2504               GError *error = NULL;
2505               GFile *base;
2506               char *dirname;
2507               gboolean success;
2508
2509               if (scanner->input_name)
2510                 dirname = g_path_get_dirname (scanner->input_name);
2511               else
2512                 dirname = g_get_current_dir ();
2513
2514               base = g_file_new_for_path (dirname);
2515               g_free (dirname);
2516
2517               success = _gtk_css_value_from_string (val,
2518                                                     base,
2519                                                     value_str,
2520                                                     &error);
2521
2522               g_object_unref (base);
2523
2524               if (success)
2525                 {
2526                   g_hash_table_insert (priv->cur_properties, prop, val);
2527                 }
2528               else
2529                 {
2530                   g_value_unset (val);
2531                   g_slice_free (GValue, val);
2532                   g_free (prop);
2533
2534                   gtk_css_provider_take_error (css_provider, scanner, error);
2535                 }
2536             }
2537         }
2538       else if (prop[0] == '-')
2539         {
2540           GValue *val;
2541
2542           val = g_slice_new0 (GValue);
2543           g_value_init (val, G_TYPE_STRING);
2544           g_value_set_string (val, value_str);
2545
2546           g_hash_table_insert (priv->cur_properties, prop, val);
2547         }
2548       else
2549         g_free (prop);
2550
2551       g_scanner_get_next_token (scanner);
2552
2553       if (g_scanner_eof (scanner))
2554         {
2555           gtk_css_provider_invalid_token (css_provider, scanner, "}");
2556           break;
2557         }
2558
2559 find_end_of_declaration:
2560       while (scanner->token != ';' &&
2561              scanner->token != G_TOKEN_RIGHT_CURLY &&
2562              !g_scanner_eof (scanner))
2563         g_scanner_get_next_token (scanner);
2564     }
2565
2566   gtk_css_scanner_pop_scope (scanner);
2567
2568   return G_TOKEN_NONE;
2569 }
2570
2571 static void
2572 gtk_css_provider_reset (GtkCssProvider *css_provider)
2573 {
2574   GtkCssProviderPrivate *priv;
2575
2576   priv = css_provider->priv;
2577
2578   if (priv->selectors_info->len > 0)
2579     g_ptr_array_remove_range (priv->selectors_info, 0, priv->selectors_info->len);
2580 }
2581
2582 static void
2583 gtk_css_provider_propagate_error (GtkCssProvider  *provider,
2584                                   const gchar     *path,
2585                                   guint            line,
2586                                   guint            position,
2587                                   const GError    *error,
2588                                   GError         **propagate_to)
2589 {
2590   /* we already set an error. And we'd like to keep the first one */
2591   if (*propagate_to)
2592     return;
2593
2594   *propagate_to = g_error_copy (error);
2595   g_prefix_error (propagate_to, "%s:%u:%u: ", path ? path : "<unknown>", line, position);
2596 }
2597
2598 static gboolean
2599 parse_stylesheet (GtkCssProvider  *css_provider,
2600                   GScanner        *scanner,
2601                   GError         **error)
2602 {
2603   gulong error_handler;
2604
2605   if (error)
2606     error_handler = g_signal_connect (css_provider,
2607                                       "parsing-error",
2608                                       G_CALLBACK (gtk_css_provider_propagate_error),
2609                                       error);
2610   else
2611     error_handler = 0; /* silence gcc */
2612
2613   g_scanner_get_next_token (scanner);
2614
2615   while (!g_scanner_eof (scanner))
2616     {
2617       GTokenType expected_token;
2618
2619       expected_token = parse_rule (css_provider, scanner);
2620
2621       if (expected_token != G_TOKEN_NONE)
2622         {
2623           while (!g_scanner_eof (scanner) &&
2624                  scanner->token != G_TOKEN_RIGHT_CURLY)
2625             g_scanner_get_next_token (scanner);
2626         }
2627       else
2628         css_provider_commit (css_provider, scanner);
2629
2630       g_scanner_get_next_token (scanner);
2631
2632       gtk_css_scanner_reset (scanner);
2633     }
2634
2635   if (error)
2636     {
2637       g_signal_handler_disconnect (css_provider, error_handler);
2638
2639       if (*error)
2640         {
2641           /* We clear all contents from the provider for backwards compat reasons */
2642           gtk_css_provider_reset (css_provider);
2643           return FALSE;
2644         }
2645     }
2646
2647   return TRUE;
2648 }
2649
2650 /**
2651  * gtk_css_provider_load_from_data:
2652  * @css_provider: a #GtkCssProvider
2653  * @data: CSS data loaded in memory
2654  * @length: the length of @data in bytes, or -1 for NUL terminated strings
2655  * @error: (out) (allow-none): return location for a #GError, or %NULL
2656  *
2657  * Loads @data into @css_provider, making it clear any previously loaded
2658  * information.
2659  *
2660  * Returns: %TRUE if the data could be loaded.
2661  **/
2662 gboolean
2663 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2664                                  const gchar     *data,
2665                                  gssize           length,
2666                                  GError         **error)
2667 {
2668   GScanner *scanner;
2669   gboolean result;
2670
2671   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2672   g_return_val_if_fail (data != NULL, FALSE);
2673
2674   if (length < 0)
2675     length = strlen (data);
2676
2677   gtk_css_provider_reset (css_provider);
2678
2679   scanner = gtk_css_scanner_new (NULL, data, length);
2680
2681   result = parse_stylesheet (css_provider, scanner, error);
2682
2683   gtk_css_scanner_destroy (scanner);
2684
2685   return result;
2686 }
2687
2688 /**
2689  * gtk_css_provider_load_from_file:
2690  * @css_provider: a #GtkCssProvider
2691  * @file: #GFile pointing to a file to load
2692  * @error: (out) (allow-none): return location for a #GError, or %NULL
2693  *
2694  * Loads the data contained in @file into @css_provider, making it
2695  * clear any previously loaded information.
2696  *
2697  * Returns: %TRUE if the data could be loaded.
2698  **/
2699 gboolean
2700 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2701                                  GFile           *file,
2702                                  GError         **error)
2703 {
2704   GError *internal_error = NULL;
2705   GScanner *scanner;
2706   gchar *data;
2707   gsize length;
2708   gboolean ret;
2709
2710   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2711   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2712
2713   if (!g_file_load_contents (file, NULL,
2714                              &data, &length,
2715                              NULL, &internal_error))
2716     {
2717       g_propagate_error (error, internal_error);
2718       return FALSE;
2719     }
2720
2721   gtk_css_provider_reset (css_provider);
2722
2723   scanner = gtk_css_scanner_new (file, data, length);
2724
2725   ret = parse_stylesheet (css_provider, scanner, error);
2726
2727   g_free (data);
2728   gtk_css_scanner_destroy (scanner);
2729
2730   return ret;
2731 }
2732
2733 static gboolean
2734 gtk_css_provider_load_from_path_internal (GtkCssProvider  *css_provider,
2735                                           const gchar     *path,
2736                                           gboolean         reset,
2737                                           GError         **error)
2738 {
2739   GtkCssProviderPrivate *priv;
2740   GError *internal_error = NULL;
2741   GMappedFile *mapped_file;
2742   GScanner *scanner;
2743   const gchar *data;
2744   gsize length;
2745   GFile *file;
2746   gboolean ret;
2747
2748   priv = css_provider->priv;
2749
2750   mapped_file = g_mapped_file_new (path, FALSE, &internal_error);
2751
2752   if (internal_error)
2753     {
2754       g_propagate_error (error, internal_error);
2755       return FALSE;
2756     }
2757
2758   length = g_mapped_file_get_length (mapped_file);
2759   data = g_mapped_file_get_contents (mapped_file);
2760
2761   if (!data)
2762     data = "";
2763
2764   if (reset)
2765     gtk_css_provider_reset (css_provider);
2766
2767   file = g_file_new_for_path (path);
2768   scanner = gtk_css_scanner_new (file, data, length);
2769   g_object_unref (file);
2770
2771   ret = parse_stylesheet (css_provider, scanner, error);
2772
2773   gtk_css_scanner_destroy (scanner);
2774
2775   g_mapped_file_unref (mapped_file);
2776
2777   return ret;
2778 }
2779
2780 /**
2781  * gtk_css_provider_load_from_path:
2782  * @css_provider: a #GtkCssProvider
2783  * @path: the path of a filename to load, in the GLib filename encoding
2784  * @error: (out) (allow-none): return location for a #GError, or %NULL
2785  *
2786  * Loads the data contained in @path into @css_provider, making it clear
2787  * any previously loaded information.
2788  *
2789  * Returns: %TRUE if the data could be loaded.
2790  **/
2791 gboolean
2792 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2793                                  const gchar     *path,
2794                                  GError         **error)
2795 {
2796   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2797   g_return_val_if_fail (path != NULL, FALSE);
2798
2799   return gtk_css_provider_load_from_path_internal (css_provider, path,
2800                                                    TRUE, error);
2801 }
2802
2803 /**
2804  * gtk_css_provider_get_default:
2805  *
2806  * Returns the provider containing the style settings used as a
2807  * fallback for all widgets.
2808  *
2809  * Returns: (transfer none): The provider used for fallback styling.
2810  *          This memory is owned by GTK+, and you must not free it.
2811  **/
2812 GtkCssProvider *
2813 gtk_css_provider_get_default (void)
2814 {
2815   static GtkCssProvider *provider;
2816
2817   if (G_UNLIKELY (!provider))
2818     {
2819       const gchar *str =
2820         "@define-color fg_color #000; \n"
2821         "@define-color bg_color #dcdad5; \n"
2822         "@define-color text_color #000; \n"
2823         "@define-color base_color #fff; \n"
2824         "@define-color selected_bg_color #4b6983; \n"
2825         "@define-color selected_fg_color #fff; \n"
2826         "@define-color tooltip_bg_color #eee1b3; \n"
2827         "@define-color tooltip_fg_color #000; \n"
2828         "@define-color placeholder_text_color #808080; \n"
2829         "\n"
2830         "@define-color info_fg_color rgb (181, 171, 156);\n"
2831         "@define-color info_bg_color rgb (252, 252, 189);\n"
2832         "@define-color warning_fg_color rgb (173, 120, 41);\n"
2833         "@define-color warning_bg_color rgb (250, 173, 61);\n"
2834         "@define-color question_fg_color rgb (97, 122, 214);\n"
2835         "@define-color question_bg_color rgb (138, 173, 212);\n"
2836         "@define-color error_fg_color rgb (166, 38, 38);\n"
2837         "@define-color error_bg_color rgb (237, 54, 54);\n"
2838         "\n"
2839         "* {\n"
2840         "  background-color: @bg_color;\n"
2841         "  color: @fg_color;\n"
2842         "  border-color: shade (@bg_color, 0.6);\n"
2843         "  padding: 2;\n"
2844         "  border-width: 0;\n"
2845         "}\n"
2846         "\n"
2847         "*:prelight {\n"
2848         "  background-color: shade (@bg_color, 1.05);\n"
2849         "  color: shade (@fg_color, 1.3);\n"
2850         "}\n"
2851         "\n"
2852         "*:selected {\n"
2853         "  background-color: @selected_bg_color;\n"
2854         "  color: @selected_fg_color;\n"
2855         "}\n"
2856         "\n"
2857         ".expander, GtkTreeView.view.expander {\n"
2858         "  color: #fff;\n"
2859         "}\n"
2860         "\n"
2861         ".expander:prelight,\n"
2862         "GtkTreeView.view.expander:selected:prelight {\n"
2863         "  color: @text_color;\n"
2864         "}\n"
2865         "\n"
2866         ".expander:active {\n"
2867         "  transition: 200ms linear;\n"
2868         "}\n"
2869         "\n"
2870         "*:insensitive {\n"
2871         "  border-color: shade (@bg_color, 0.7);\n"
2872         "  background-color: shade (@bg_color, 0.9);\n"
2873         "  color: shade (@bg_color, 0.7);\n"
2874         "}\n"
2875         "\n"
2876         ".view {\n"
2877         "  border-width: 0;\n"
2878         "  border-radius: 0;\n"
2879         "  background-color: @base_color;\n"
2880         "  color: @text_color;\n"
2881         "}\n"
2882         ".view:selected {\n"
2883         "  background-color: shade (@bg_color, 0.9);\n"
2884         "  color: @fg_color;\n"
2885         "}\n"
2886         "\n"
2887         ".view:selected:focused {\n"
2888         "  background-color: @selected_bg_color;\n"
2889         "  color: @selected_fg_color;\n"
2890         "}\n"
2891         "\n"
2892         ".view column:sorted row,\n"
2893         ".view column:sorted row:prelight {\n"
2894         "  background-color: shade (@bg_color, 0.85);\n"
2895         "}\n"
2896         "\n"
2897         ".view column:sorted row:nth-child(odd),\n"
2898         ".view column:sorted row:nth-child(odd):prelight {\n"
2899         "  background-color: shade (@bg_color, 0.8);\n"
2900         "}\n"
2901         "\n"
2902         ".view row,\n"
2903         ".view row:prelight {\n"
2904         "  background-color: @base_color;\n"
2905         "  color: @text_color;\n"
2906         "}\n"
2907         "\n"
2908         ".view row:nth-child(odd),\n"
2909         ".view row:nth-child(odd):prelight {\n"
2910         "  background-color: shade (@base_color, 0.93); \n"
2911         "}\n"
2912         "\n"
2913         ".view row:selected:focused {\n"
2914         "  background-color: @selected_bg_color;\n"
2915         "}\n"
2916         "\n"
2917         ".view row:selected {\n"
2918         "  background-color: darker (@bg_color);\n"
2919         "  color: @selected_fg_color;\n"
2920         "}\n"
2921         "\n"
2922         ".view.cell.trough,\n"
2923         ".view.cell.trough:hover,\n"
2924         ".view.cell.trough:selected,\n"
2925         ".view.cell.trough:selected:focused {\n"
2926         "  background-color: @bg_color;\n"
2927         "  color: @fg_color;\n"
2928         "}\n"
2929         "\n"
2930         ".view.cell.progressbar,\n"
2931         ".view.cell.progressbar:hover,\n"
2932         ".view.cell.progressbar:selected,\n"
2933         ".view.cell.progressbar:selected:focused {\n"
2934         "  background-color: @selected_bg_color;\n"
2935         "  color: @selected_fg_color;\n"
2936         "}\n"
2937         "\n"
2938         ".rubberband {\n"
2939         "  background-color: alpha (@fg_color, 0.25);\n"
2940         "  border-color: @fg_color;\n"
2941         "  border-style: solid;\n"
2942         "  border-width: 1;\n"
2943         "}\n"
2944         "\n"
2945         ".tooltip {\n"
2946         "  background-color: @tooltip_bg_color; \n"
2947         "  color: @tooltip_fg_color; \n"
2948         "  border-color: @tooltip_fg_color; \n"
2949         "  border-width: 1;\n"
2950         "  border-style: solid;\n"
2951         "}\n"
2952         "\n"
2953         ".button,\n"
2954         ".slider {\n"
2955         "  border-style: outset; \n"
2956         "  border-width: 2; \n"
2957         "}\n"
2958         "\n"
2959         ".button:active {\n"
2960         "  background-color: shade (@bg_color, 0.7);\n"
2961         "  border-style: inset; \n"
2962         "}\n"
2963         "\n"
2964         ".button:prelight,\n"
2965         ".slider:prelight {\n"
2966         "  background-color: @selected_bg_color;\n"
2967         "  color: @selected_fg_color;\n"
2968         "  border-color: shade (@selected_bg_color, 0.7);\n"
2969         "}\n"
2970         "\n"
2971         ".trough {\n"
2972         "  background-color: darker (@bg_color);\n"
2973         "  border-style: inset;\n"
2974         "  border-width: 1;\n"
2975         "  padding: 0;\n"
2976         "}\n"
2977         "\n"
2978         ".entry {\n"
2979         "  border-style: inset;\n"
2980         "  border-width: 2;\n"
2981         "  background-color: @base_color;\n"
2982         "  color: @text_color;\n"
2983         "}\n"
2984         "\n"
2985         ".entry:insensitive {\n"
2986         "  background-color: shade (@base_color, 0.9);\n"
2987         "  color: shade (@base_color, 0.7);\n"
2988         "}\n"
2989         ".entry:active {\n"
2990         "  background-color: #c4c2bd;\n"
2991         "  color: #000;\n"
2992         "}\n"
2993         "\n"
2994         ".progressbar,\n"
2995         ".entry.progressbar, \n"
2996         ".cell.progressbar {\n"
2997         "  background-color: @selected_bg_color;\n"
2998         "  border-color: shade (@selected_bg_color, 0.7);\n"
2999         "  color: @selected_fg_color;\n"
3000         "  border-style: outset;\n"
3001         "  border-width: 1;\n"
3002         "}\n"
3003         "\n"
3004         "GtkCheckButton:hover,\n"
3005         "GtkCheckButton:selected,\n"
3006         "GtkRadioButton:hover,\n"
3007         "GtkRadioButton:selected {\n"
3008         "  background-color: shade (@bg_color, 1.05);\n"
3009         "}\n"
3010         "\n"
3011         ".check, .radio,"
3012         ".cell.check, .cell.radio,\n"
3013         ".cell.check:hover, .cell.radio:hover {\n"
3014         "  border-style: solid;\n"
3015         "  border-width: 1;\n"
3016         "  background-color: @base_color;\n"
3017         "  border-color: @fg_color;\n"
3018         "}\n"
3019         "\n"
3020         ".check:active, .radio:active,\n"
3021         ".check:hover, .radio:hover {\n"
3022         "  background-color: @base_color;\n"
3023         "  border-color: @fg_color;\n"
3024         "  color: @text_color;\n"
3025         "}\n"
3026         "\n"
3027         ".check:selected, .radio:selected {\n"
3028         "  background-color: darker (@bg_color);\n"
3029         "  color: @selected_fg_color;\n"
3030         "  border-color: @selected_fg_color;\n"
3031         "}\n"
3032         "\n"
3033         ".check:selected:focused, .radio:selected:focused {\n"
3034         "  background-color: @selected_bg_color;\n"
3035         "}\n"
3036         "\n"
3037         ".menu.check, .menu.radio {\n"
3038         "  color: @fg_color;\n"
3039         "  border-style: none;\n"
3040         "  border-width: 0;\n"
3041         "}\n"
3042         "\n"
3043         ".popup {\n"
3044         "  border-style: outset;\n"
3045         "  border-width: 1;\n"
3046         "}\n"
3047         "\n"
3048         ".viewport {\n"
3049         "  border-style: inset;\n"
3050         "  border-width: 2;\n"
3051         "}\n"
3052         "\n"
3053         ".notebook {\n"
3054         "  border-style: outset;\n"
3055         "  border-width: 1;\n"
3056         "}\n"
3057         "\n"
3058         ".frame {\n"
3059         "  border-style: inset;\n"
3060         "  border-width: 1;\n"
3061         "}\n"
3062         "\n"
3063         "GtkScrolledWindow.frame {\n"
3064         "  padding: 0;\n"
3065         "}\n"
3066         "\n"
3067         ".menu,\n"
3068         ".menubar,\n"
3069         ".toolbar {\n"
3070         "  border-style: outset;\n"
3071         "  border-width: 1;\n"
3072         "}\n"
3073         "\n"
3074         ".menu:hover,\n"
3075         ".menubar:hover,\n"
3076         ".menu.check:hover,\n"
3077         ".menu.radio:hover {\n"
3078         "  background-color: @selected_bg_color;\n"
3079         "  color: @selected_fg_color;\n"
3080         "}\n"
3081         "\n"
3082         "GtkSpinButton.button {\n"
3083         "  border-width: 1;\n"
3084         "}\n"
3085         "\n"
3086         ".scale.slider:hover,\n"
3087         "GtkSpinButton.button:hover {\n"
3088         "  background-color: shade (@bg_color, 1.05);\n"
3089         "  border-color: shade (@bg_color, 0.8);\n"
3090         "}\n"
3091         "\n"
3092         "GtkSwitch.trough:active {\n"
3093         "  background-color: @selected_bg_color;\n"
3094         "  color: @selected_fg_color;\n"
3095         "}\n"
3096         "\n"
3097         "GtkToggleButton.button:inconsistent {\n"
3098         "  border-style: outset;\n"
3099         "  border-width: 1px;\n"
3100         "  background-color: shade (@bg_color, 0.9);\n"
3101         "  border-color: shade (@bg_color, 0.7);\n"
3102         "}\n"
3103         "\n"
3104         "GtkLabel:selected {\n"
3105         "  background-color: shade (@bg_color, 0.9);\n"
3106         "}\n"
3107         "\n"
3108         "GtkLabel:selected:focused {\n"
3109         "  background-color: @selected_bg_color;\n"
3110         "}\n"
3111         "\n"
3112         ".spinner:active {\n"
3113         "  transition: 750ms linear loop;\n"
3114         "}\n"
3115         "\n"
3116         ".info {\n"
3117         "  background-color: @info_bg_color;\n"
3118         "  color: @info_fg_color;\n"
3119         "}\n"
3120         "\n"
3121         ".warning {\n"
3122         "  background-color: @warning_bg_color;\n"
3123         "  color: @warning_fg_color;\n"
3124         "}\n"
3125         "\n"
3126         ".question {\n"
3127         "  background-color: @question_bg_color;\n"
3128         "  color: @question_fg_color;\n"
3129         "}\n"
3130         "\n"
3131         ".error {\n"
3132         "  background-color: @error_bg_color;\n"
3133         "  color: @error_fg_color;\n"
3134         "}\n"
3135         "\n"
3136         ".highlight {\n"
3137         "  background-color: @selected_bg_color;\n"
3138         "  color: @selected_fg_color;\n"
3139         "}\n"
3140         "\n"
3141         ".light-area-focus {\n"
3142         "  color: #000;\n"
3143         "}\n"
3144         "\n"
3145         ".dark-area-focus {\n"
3146         "  color: #fff;\n"
3147         "}\n"
3148         "GtkCalendar.view {\n"
3149         "  border-width: 1;\n"
3150         "  border-style: inset;\n"
3151         "  padding: 1;\n"
3152         "}\n"
3153         "\n"
3154         "GtkCalendar.view:inconsistent {\n"
3155         "  color: darker (@bg_color);\n"
3156         "}\n"
3157         "\n"
3158         "GtkCalendar.header {\n"
3159         "  background-color: @bg_color;\n"
3160         "  border-style: outset;\n"
3161         "  border-width: 2;\n"
3162         "}\n"
3163         "\n"
3164         "GtkCalendar.highlight {\n"
3165         "  border-width: 0;\n"
3166         "}\n"
3167         "\n"
3168         "GtkCalendar.button {\n"
3169         "  background-color: @bg_color;\n"
3170         "}\n"
3171         "\n"
3172         "GtkCalendar.button:hover {\n"
3173         "  background-color: lighter (@bg_color);\n"
3174         "  color: @fg_color;\n"
3175         "}\n"
3176         "\n"
3177         ".menu * {\n"
3178         "  border-width: 0;\n"
3179         "  padding: 2;\n"
3180         "}\n"
3181         "\n";
3182
3183       provider = gtk_css_provider_new ();
3184       if (!gtk_css_provider_load_from_data (provider, str, -1, NULL))
3185         {
3186           g_error ("Failed to load the internal default CSS.");
3187         }
3188     }
3189
3190   return provider;
3191 }
3192
3193 gchar *
3194 _gtk_css_provider_get_theme_dir (void)
3195 {
3196   const gchar *var;
3197   gchar *path;
3198
3199   var = g_getenv ("GTK_DATA_PREFIX");
3200
3201   if (var)
3202     path = g_build_filename (var, "share", "themes", NULL);
3203   else
3204     path = g_build_filename (GTK_DATA_PREFIX, "share", "themes", NULL);
3205
3206   return path;
3207 }
3208
3209 /**
3210  * gtk_css_provider_get_named:
3211  * @name: A theme name
3212  * @variant: (allow-none): variant to load, for example, "dark", or
3213  *     %NULL for the default
3214  *
3215  * Loads a theme from the usual theme paths
3216  *
3217  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
3218  *     This memory is owned by GTK+, and you must not free it.
3219  */
3220 GtkCssProvider *
3221 gtk_css_provider_get_named (const gchar *name,
3222                             const gchar *variant)
3223 {
3224   static GHashTable *themes = NULL;
3225   GtkCssProvider *provider;
3226   gchar *key;
3227
3228   if (G_UNLIKELY (!themes))
3229     themes = g_hash_table_new (g_str_hash, g_str_equal);
3230
3231   if (variant == NULL)
3232     key = (gchar *)name;
3233   else
3234     key = g_strconcat (name, "-", variant, NULL);
3235
3236   provider = g_hash_table_lookup (themes, key);
3237
3238   if (!provider)
3239     {
3240       const gchar *home_dir;
3241       gchar *subpath, *path = NULL;
3242
3243       if (variant)
3244         subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
3245       else
3246         subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
3247
3248       /* First look in the users home directory
3249        */
3250       home_dir = g_get_home_dir ();
3251       if (home_dir)
3252         {
3253           path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
3254
3255           if (!g_file_test (path, G_FILE_TEST_EXISTS))
3256             {
3257               g_free (path);
3258               path = NULL;
3259             }
3260         }
3261
3262       if (!path)
3263         {
3264           gchar *theme_dir;
3265
3266           theme_dir = _gtk_css_provider_get_theme_dir ();
3267           path = g_build_filename (theme_dir, name, subpath, NULL);
3268           g_free (theme_dir);
3269
3270           if (!g_file_test (path, G_FILE_TEST_EXISTS))
3271             {
3272               g_free (path);
3273               path = NULL;
3274             }
3275         }
3276
3277       g_free (subpath);
3278
3279       if (path)
3280         {
3281           GError *error;
3282
3283           provider = gtk_css_provider_new ();
3284           error = NULL;
3285           if (!gtk_css_provider_load_from_path (provider, path, &error))
3286             {
3287               g_warning ("Could not load named theme \"%s\": %s", name, error->message);
3288               g_error_free (error);
3289
3290               g_object_unref (provider);
3291               provider = NULL;
3292             }
3293           else
3294             g_hash_table_insert (themes, g_strdup (key), provider);
3295
3296           g_free (path);
3297         }
3298     }
3299
3300   if (key != name)
3301     g_free (key);
3302
3303   return provider;
3304 }
3305
3306 static void
3307 selector_path_print (const SelectorPath *path,
3308                      GString *           str)
3309 {
3310   GSList *walk, *reverse;
3311
3312   reverse = g_slist_copy (path->elements);
3313   reverse = g_slist_reverse (reverse);
3314
3315   for (walk = reverse; walk; walk = walk->next)
3316     {
3317       SelectorElement *elem = walk->data;
3318
3319       switch (elem->elem_type)
3320         {
3321         case SELECTOR_TYPE_NAME:
3322         case SELECTOR_NAME:
3323           g_string_append (str, g_quark_to_string (elem->name));
3324           break;
3325         case SELECTOR_GTYPE:
3326           g_string_append (str, g_type_name (elem->type));
3327           break;
3328         case SELECTOR_REGION:
3329           g_string_append (str, g_quark_to_string (elem->region.name));
3330           if (elem->region.flags)
3331             {
3332               char * flag_names[] = {
3333                 "nth-child(even)",
3334                 "nth-child(odd)",
3335                 "first-child",
3336                 "last-child",
3337                 "sorted"
3338               };
3339               guint i;
3340
3341               for (i = 0; i < G_N_ELEMENTS (flag_names); i++)
3342                 {
3343                   if (elem->region.flags & (1 << i))
3344                     {
3345                       g_string_append_c (str, ':');
3346                       g_string_append (str, flag_names[i]);
3347                     }
3348                 }
3349             }
3350           break;
3351         case SELECTOR_CLASS:
3352           g_string_append_c (str, '.');
3353           g_string_append (str, g_quark_to_string (elem->name));
3354           break;
3355         case SELECTOR_GLOB:
3356           if (walk->next == NULL ||
3357               elem->combinator != COMBINATOR_CHILD ||
3358               ((SelectorElement *) walk->next->data)->elem_type != SELECTOR_CLASS)
3359             g_string_append (str, "*");
3360           break;
3361         default:
3362           g_assert_not_reached ();
3363         }
3364
3365       if (walk->next)
3366         {
3367           switch (elem->combinator)
3368             {
3369             case COMBINATOR_DESCENDANT:
3370               if (elem->elem_type != SELECTOR_CLASS ||
3371                   ((SelectorElement *) walk->next->data)->elem_type != SELECTOR_CLASS)
3372                 g_string_append_c (str, ' ');
3373               break;
3374             case COMBINATOR_CHILD:
3375               if (((SelectorElement *) walk->next->data)->elem_type != SELECTOR_CLASS)
3376                 g_string_append (str, " > ");
3377               break;
3378             default:
3379               g_assert_not_reached ();
3380             }
3381         }
3382
3383     }
3384
3385   if (path->state)
3386     {
3387       char * state_names[] = {
3388         "active",
3389         "hover",
3390         "selected",
3391         "insensitive",
3392         "inconsistent",
3393         "focus"
3394       };
3395       guint i;
3396
3397       for (i = 0; i < G_N_ELEMENTS (state_names); i++)
3398         {
3399           if (path->state & (1 << i))
3400             {
3401               g_string_append_c (str, ':');
3402               g_string_append (str, state_names[i]);
3403             }
3404         }
3405     }
3406
3407   g_slist_free (reverse);
3408 }
3409
3410 static void
3411 selector_style_info_print (const SelectorStyleInfo *info,
3412                            GString                 *str)
3413 {
3414   GList *keys, *walk;
3415   char *s;
3416
3417   selector_path_print (info->path, str);
3418
3419   g_string_append (str, " {\n");
3420
3421   keys = g_hash_table_get_keys (info->style);
3422   /* so the output is identical for identical selector styles */
3423   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3424
3425   for (walk = keys; walk; walk = walk->next)
3426     {
3427       const char *name = walk->data;
3428       const GValue *value = g_hash_table_lookup (info->style, (gpointer) name);
3429
3430       g_string_append (str, "  ");
3431       g_string_append (str, name);
3432       g_string_append (str, ": ");
3433       s = _gtk_css_value_to_string (value);
3434       g_string_append (str, s);
3435       g_free (s);
3436       g_string_append (str, ";\n");
3437     }
3438
3439   g_list_free (keys);
3440
3441   g_string_append (str, "}\n");
3442 }
3443
3444 static void
3445 gtk_css_provider_print_colors (GHashTable *colors,
3446                                GString    *str)
3447 {
3448   GList *keys, *walk;
3449   char *s;
3450
3451   keys = g_hash_table_get_keys (colors);
3452   /* so the output is identical for identical styles */
3453   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3454
3455   for (walk = keys; walk; walk = walk->next)
3456     {
3457       const char *name = walk->data;
3458       GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
3459
3460       g_string_append (str, "@define-color ");
3461       g_string_append (str, name);
3462       g_string_append (str, " ");
3463       s = gtk_symbolic_color_to_string (symbolic);
3464       g_string_append (str, s);
3465       g_free (s);
3466       g_string_append (str, ";\n");
3467     }
3468
3469   g_list_free (keys);
3470 }
3471
3472 /**
3473  * gtk_css_provider_to_string:
3474  * @provider: the provider to write to a string
3475  *
3476  * Convertes the @provider into a string representation in CSS
3477  * format.
3478  *
3479  * Using gtk_css_provider_load_from_data() with the return value
3480  * from this function on a new provider created with
3481  * gtk_css_provider_new() will basicallu create a duplicate of
3482  * this @provider.
3483  *
3484  * Returns: a new string representing the @provider.
3485  **/
3486 char *
3487 gtk_css_provider_to_string (GtkCssProvider *provider)
3488 {
3489   GtkCssProviderPrivate *priv;
3490   GString *str;
3491   guint i;
3492
3493   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
3494
3495   priv = provider->priv;
3496
3497   str = g_string_new ("");
3498
3499   gtk_css_provider_print_colors (priv->symbolic_colors, str);
3500
3501   for (i = 0; i < priv->selectors_info->len; i++)
3502     {
3503       if (i > 0)
3504         g_string_append (str, "\n");
3505       selector_style_info_print (g_ptr_array_index (priv->selectors_info, i),
3506                                  str);
3507     }
3508
3509   return g_string_free (str, FALSE);
3510 }
3511