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   GSList *state;
 792   GSList *cur_selectors;
 793   GHashTable *cur_properties;
 794 };
 795
 796 struct _GtkCssProviderPrivate
 797 {
 798   GScanner *scanner;
 799
 800   GHashTable *symbolic_colors;
 801
 802   GPtrArray *selectors_info;
 803
 804   /* Current parser state */
 805   GError *error;
 806 };
 807
 808 enum ParserScope {
 809   SCOPE_SELECTOR,
 810   SCOPE_PSEUDO_CLASS,
 811   SCOPE_NTH_CHILD,
 812   SCOPE_DECLARATION,
 813   SCOPE_VALUE,
 814   SCOPE_BINDING_SET
 815 };
 816
 817 /* Extend GtkStateType, since these
 818  * values are also used as symbols
 819  */
 820 enum ParserSymbol {
 821   /* Scope: pseudo-class */
 822   SYMBOL_NTH_CHILD = GTK_STATE_FOCUSED + 1,
 823   SYMBOL_FIRST_CHILD,
 824   SYMBOL_LAST_CHILD,
 825   SYMBOL_SORTED_CHILD,
 826
 827   /* Scope: nth-child */
 828   SYMBOL_NTH_CHILD_EVEN,
 829   SYMBOL_NTH_CHILD_ODD,
 830   SYMBOL_NTH_CHILD_FIRST,
 831   SYMBOL_NTH_CHILD_LAST
 832 };
 833
 834 enum {
 835   PARSING_ERROR,
 836   LAST_SIGNAL
 837 };
 838
 839 static guint css_provider_signals[LAST_SIGNAL] = { 0 };
 840
 841 static void gtk_css_provider_finalize (GObject *object);
 842 static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
 843
 844 static void scanner_apply_scope (GScanner    *scanner,
 845                                  ParserScope  scope);
 846 static void     css_provider_reset_parser (GtkCssProvider *css_provider);
 847 static gboolean gtk_css_provider_load_from_path_internal (GtkCssProvider  *css_provider,
 848                                                           const gchar     *path,
 849                                                           gboolean         reset,
 850                                                           GError         **error);
 851 static void     gtk_css_provider_take_error (GtkCssProvider *provider,
 852                                              GScanner       *scanner,
 853                                              GError         *error);
 854
 855 GQuark
 856 gtk_css_provider_error_quark (void)
 857 {
 858   return g_quark_from_static_string ("gtk-css-provider-error-quark");
 859 }
 860
 861 G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
 862                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
 863                                                gtk_css_style_provider_iface_init));
 864
 865 static void
 866 gtk_css_provider_parsing_error (GtkCssProvider  *provider,
 867                                 const gchar     *path,
 868                                 guint            line,
 869                                 guint            position,
 870                                 const GError *   error)
 871 {
 872   GtkCssProviderPrivate *priv = provider->priv;
 873
 874   if (!priv->error)
 875     {
 876       priv->error = g_error_copy (error);
 877       g_prefix_error (&priv->error, "%s:%u:%u: ", path ? path : "<unknown>", line, position);
 878     }
 879
 880   /* Only emit a warning when we have no error handlers. This is our
 881    * default handlers. And in this case erroneous CSS files are a bug
 882    * and should be fixed.
 883    * Note that these warnings can also be triggered by a broken theme
 884    * that people installed from some weird location on the internets.
 885    */
 886   if (!g_signal_has_handler_pending (provider,
 887                                      css_provider_signals[PARSING_ERROR],
 888                                      0,
 889                                      TRUE))
 890     {
 891       g_warning ("Theme parsing error: %s:%u:%u: %s", path ? path : "<unknown>", line, position, error->message);
 892     }
 893 }
 894
 895 static void
 896 gtk_css_provider_class_init (GtkCssProviderClass *klass)
 897 {
 898   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 899
 900   /**
 901    * GtkCssProvider::parsing-error:
 902    * @provider: the provider that had a parsing error
 903    * @path: path to the parsed file or %NULL if the file cannot be
 904    *   identified or the data was not loaded from a file
 905    * @line: line in the file or data or 0 if unknown
 906    * @position: offset into the current line or 0 if unknown or the
 907    *   whole line is affected
 908    * @error: The parsing error
 909    *
 910    * Signals that a parsing error occured. the @path, @line and @position
 911    * describe the actual location of the error as accurately as possible.
 912    *
 913    * Parsing errors are never fatal, so the parsing will resume after
 914    * the error. Errors may however cause parts of the given
 915    * data or even all of it to not be parsed at all. So it is a useful idea
 916    * to check that the parsing succeeds by connecting to this signal.
 917    *
 918    * Note that this signal may be emitted at any time as the css provider
 919    * may opt to defer parsing parts or all of the input to a later time
 920    * than when a loading function was called.
 921    */
 922   css_provider_signals[PARSING_ERROR] =
 923     g_signal_new (I_("parsing-error"),
 924                   G_TYPE_FROM_CLASS (object_class),
 925                   G_SIGNAL_RUN_LAST,
 926                   G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
 927                   NULL, NULL,
 928                   _gtk_marshal_VOID__STRING_UINT_UINT_BOXED,
 929                   G_TYPE_NONE, 4,
 930                   G_TYPE_STRING, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_ERROR);
 931
 932   object_class->finalize = gtk_css_provider_finalize;
 933
 934   klass->parsing_error = gtk_css_provider_parsing_error;
 935
 936   g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
 937 }
 938
 939 static SelectorPath *
 940 selector_path_new (void)
 941 {
 942   SelectorPath *path;
 943
 944   path = g_slice_new0 (SelectorPath);
 945   path->ref_count = 1;
 946
 947   return path;
 948 }
 949
 950 static SelectorPath *
 951 selector_path_ref (SelectorPath *path)
 952 {
 953   path->ref_count++;
 954   return path;
 955 }
 956
 957 static void
 958 selector_path_unref (SelectorPath *path)
 959 {
 960   path->ref_count--;
 961
 962   if (path->ref_count > 0)
 963     return;
 964
 965   while (path->elements)
 966     {
 967       g_slice_free (SelectorElement, path->elements->data);
 968       path->elements = g_slist_delete_link (path->elements, path->elements);
 969     }
 970
 971   g_slice_free (SelectorPath, path);
 972 }
 973
 974 static void
 975 selector_path_prepend_type (SelectorPath *path,
 976                             const gchar  *type_name)
 977 {
 978   SelectorElement *elem;
 979   GType type;
 980
 981   elem = g_slice_new (SelectorElement);
 982   elem->combinator = COMBINATOR_DESCENDANT;
 983   type = g_type_from_name (type_name);
 984
 985   if (type == G_TYPE_INVALID)
 986     {
 987       elem->elem_type = SELECTOR_TYPE_NAME;
 988       elem->name = g_quark_from_string (type_name);
 989     }
 990   else
 991     {
 992       elem->elem_type = SELECTOR_GTYPE;
 993       elem->type = type;
 994     }
 995
 996   path->elements = g_slist_prepend (path->elements, elem);
 997 }
 998
 999 static void
1000 selector_path_prepend_glob (SelectorPath *path)
1001 {
1002   SelectorElement *elem;
1003
1004   elem = g_slice_new (SelectorElement);
1005   elem->elem_type = SELECTOR_GLOB;
1006   elem->combinator = COMBINATOR_DESCENDANT;
1007
1008   path->elements = g_slist_prepend (path->elements, elem);
1009 }
1010
1011 static void
1012 selector_path_prepend_region (SelectorPath   *path,
1013                               const gchar    *name,
1014                               GtkRegionFlags  flags)
1015 {
1016   SelectorElement *elem;
1017
1018   elem = g_slice_new (SelectorElement);
1019   elem->combinator = COMBINATOR_DESCENDANT;
1020   elem->elem_type = SELECTOR_REGION;
1021
1022   elem->region.name = g_quark_from_string (name);
1023   elem->region.flags = flags;
1024
1025   path->elements = g_slist_prepend (path->elements, elem);
1026 }
1027
1028 static void
1029 selector_path_prepend_name (SelectorPath *path,
1030                             const gchar  *name)
1031 {
1032   SelectorElement *elem;
1033
1034   elem = g_slice_new (SelectorElement);
1035   elem->combinator = COMBINATOR_DESCENDANT;
1036   elem->elem_type = SELECTOR_NAME;
1037
1038   elem->name = g_quark_from_string (name);
1039
1040   path->elements = g_slist_prepend (path->elements, elem);
1041 }
1042
1043 static void
1044 selector_path_prepend_class (SelectorPath *path,
1045                              const gchar  *name)
1046 {
1047   SelectorElement *elem;
1048
1049   elem = g_slice_new (SelectorElement);
1050   elem->combinator = COMBINATOR_DESCENDANT;
1051   elem->elem_type = SELECTOR_CLASS;
1052
1053   elem->name = g_quark_from_string (name);
1054
1055   path->elements = g_slist_prepend (path->elements, elem);
1056 }
1057
1058 static void
1059 selector_path_prepend_combinator (SelectorPath   *path,
1060                                   CombinatorType  combinator)
1061 {
1062   SelectorElement *elem;
1063
1064   g_assert (path->elements != NULL);
1065
1066   /* It is actually stored in the last element */
1067   elem = path->elements->data;
1068   elem->combinator = combinator;
1069 }
1070
1071 static gint
1072 selector_path_depth (SelectorPath *path)
1073 {
1074   return g_slist_length (path->elements);
1075 }
1076
1077 static SelectorStyleInfo *
1078 selector_style_info_new (SelectorPath *path)
1079 {
1080   SelectorStyleInfo *info;
1081
1082   info = g_slice_new0 (SelectorStyleInfo);
1083   info->path = selector_path_ref (path);
1084
1085   return info;
1086 }
1087
1088 static void
1089 selector_style_info_free (SelectorStyleInfo *info)
1090 {
1091   if (info->style)
1092     g_hash_table_unref (info->style);
1093
1094   if (info->path)
1095     selector_path_unref (info->path);
1096
1097   g_slice_free (SelectorStyleInfo, info);
1098 }
1099
1100 static void
1101 selector_style_info_set_style (SelectorStyleInfo *info,
1102                                GHashTable        *style)
1103 {
1104   if (info->style)
1105     g_hash_table_unref (info->style);
1106
1107   if (style)
1108     info->style = g_hash_table_ref (style);
1109   else
1110     info->style = NULL;
1111 }
1112
1113 static void
1114 property_value_free (GValue *value)
1115 {
1116   if (G_IS_VALUE (value))
1117     g_value_unset (value);
1118
1119   g_slice_free (GValue, value);
1120 }
1121
1122 static void
1123 gtk_css_scanner_reset (GScanner *scanner)
1124 {
1125   GtkCssScannerPrivate *priv = scanner->user_data;
1126
1127   g_slist_free (priv->state);
1128   priv->state = NULL;
1129
1130   g_slist_foreach (priv->cur_selectors, (GFunc) selector_path_unref, NULL);
1131   g_slist_free (priv->cur_selectors);
1132   priv->cur_selectors = NULL;
1133
1134   if (priv->cur_properties)
1135     g_hash_table_unref (priv->cur_properties);
1136
1137   priv->cur_properties = g_hash_table_new_full (g_str_hash,
1138                                                 g_str_equal,
1139                                                 (GDestroyNotify) g_free,
1140                                                 (GDestroyNotify) property_value_free);
1141
1142   scanner_apply_scope (scanner, SCOPE_SELECTOR);
1143 }
1144
1145 static void
1146 gtk_css_scanner_destroy (GScanner *scanner)
1147 {
1148   GtkCssScannerPrivate *priv = scanner->user_data;
1149
1150   gtk_css_scanner_reset (scanner);
1151
1152   g_hash_table_destroy (priv->cur_properties);
1153   g_slice_free (GtkCssScannerPrivate, priv);
1154
1155   g_scanner_destroy (scanner);
1156 }
1157
1158 static GScanner *
1159 gtk_css_provider_create_scanner (GtkCssProvider *provider)
1160 {
1161   GtkCssScannerPrivate *priv;
1162   GScanner *scanner;
1163
1164   scanner = g_scanner_new (NULL);
1165
1166   priv = scanner->user_data = g_slice_new0 (GtkCssScannerPrivate);
1167
1168   priv->cur_properties = g_hash_table_new_full (g_str_hash,
1169                                                 g_str_equal,
1170                                                 (GDestroyNotify) g_free,
1171                                                 (GDestroyNotify) property_value_free);
1172
1173   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "active", GUINT_TO_POINTER (GTK_STATE_ACTIVE));
1174   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "prelight", GUINT_TO_POINTER (GTK_STATE_PRELIGHT));
1175   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "hover", GUINT_TO_POINTER (GTK_STATE_PRELIGHT));
1176   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "selected", GUINT_TO_POINTER (GTK_STATE_SELECTED));
1177   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "insensitive", GUINT_TO_POINTER (GTK_STATE_INSENSITIVE));
1178   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "inconsistent", GUINT_TO_POINTER (GTK_STATE_INCONSISTENT));
1179   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "focused", GUINT_TO_POINTER (GTK_STATE_FOCUSED));
1180   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "focus", GUINT_TO_POINTER (GTK_STATE_FOCUSED));
1181
1182   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "nth-child", GUINT_TO_POINTER (SYMBOL_NTH_CHILD));
1183   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "first-child", GUINT_TO_POINTER (SYMBOL_FIRST_CHILD));
1184   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "last-child", GUINT_TO_POINTER (SYMBOL_LAST_CHILD));
1185   g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "sorted", GUINT_TO_POINTER (SYMBOL_SORTED_CHILD));
1186
1187   g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "even", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_EVEN));
1188   g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "odd", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_ODD));
1189   g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "first", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_FIRST));
1190   g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "last", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_LAST));
1191
1192   scanner_apply_scope (scanner, SCOPE_SELECTOR);
1193
1194   return scanner;
1195 }
1196
1197 static void
1198 gtk_css_provider_init (GtkCssProvider *css_provider)
1199 {
1200   GtkCssProviderPrivate *priv;
1201
1202   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1203                                                            GTK_TYPE_CSS_PROVIDER,
1204                                                            GtkCssProviderPrivate);
1205
1206   priv->selectors_info = g_ptr_array_new_with_free_func ((GDestroyNotify) selector_style_info_free);
1207   priv->scanner = gtk_css_provider_create_scanner (css_provider);
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   css_provider_reset_parser (css_provider);
1594
1595   gtk_css_scanner_destroy (priv->scanner);
1596
1597   g_ptr_array_free (priv->selectors_info, TRUE);
1598
1599   if (priv->symbolic_colors)
1600     g_hash_table_destroy (priv->symbolic_colors);
1601
1602   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1603 }
1604
1605 /**
1606  * gtk_css_provider_new:
1607  *
1608  * Returns a newly created #GtkCssProvider.
1609  *
1610  * Returns: A new #GtkCssProvider
1611  **/
1612 GtkCssProvider *
1613 gtk_css_provider_new (void)
1614 {
1615   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1616 }
1617
1618 static void
1619 gtk_css_provider_take_error (GtkCssProvider *provider,
1620                              GScanner       *scanner,
1621                              GError         *error)
1622 {
1623   const char *filename;
1624   guint line, position;
1625
1626   if (scanner)
1627     {
1628       filename = scanner->input_name;
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_error_free (error);
1643 }
1644
1645 static void
1646 gtk_css_provider_error_literal (GtkCssProvider *provider,
1647                                 GScanner       *scanner,
1648                                 GQuark          domain,
1649                                 gint            code,
1650                                 const char     *message)
1651 {
1652   gtk_css_provider_take_error (provider,
1653                                scanner,
1654                                g_error_new_literal (domain, code, message));
1655 }
1656
1657 static void
1658 gtk_css_provider_error (GtkCssProvider *provider,
1659                         GScanner       *scanner,
1660                         GQuark          domain,
1661                         gint            code,
1662                         const char     *format,
1663                         ...)  G_GNUC_PRINTF (5, 6);
1664 static void
1665 gtk_css_provider_error (GtkCssProvider *provider,
1666                         GScanner       *scanner,
1667                         GQuark          domain,
1668                         gint            code,
1669                         const char     *format,
1670                         ...)
1671 {
1672   GError *error;
1673   va_list args;
1674
1675   va_start (args, format);
1676   error = g_error_new_valist (domain, code, format, args);
1677   va_end (args);
1678
1679   gtk_css_provider_take_error (provider, scanner, error);
1680 }
1681
1682 static void
1683 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1684                                 GScanner       *scanner,
1685                                 const char     *expected)
1686 {
1687   gtk_css_provider_error (provider,
1688                           scanner,
1689                           GTK_CSS_PROVIDER_ERROR,
1690                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1691                           "expected a valid %s", expected);
1692 }
1693
1694 static void
1695 scanner_apply_scope (GScanner    *scanner,
1696                      ParserScope  scope)
1697 {
1698   g_scanner_set_scope (scanner, scope);
1699
1700   if (scope == SCOPE_VALUE)
1701     {
1702       scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_";
1703       scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_ +(),.%\t\n'/\"";
1704       scanner->config->scan_identifier_1char = TRUE;
1705     }
1706   else if (scope == SCOPE_BINDING_SET)
1707     {
1708       scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_";
1709       scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_ +(){}<>,.%\t\n'/\"";
1710       scanner->config->scan_identifier_1char = TRUE;
1711     }
1712   else if (scope == SCOPE_SELECTOR)
1713     {
1714       scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "*@";
1715       scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "-_#.";
1716       scanner->config->scan_identifier_1char = TRUE;
1717     }
1718   else if (scope == SCOPE_PSEUDO_CLASS ||
1719            scope == SCOPE_NTH_CHILD ||
1720            scope == SCOPE_DECLARATION)
1721     {
1722       scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "-_";
1723       scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "-_";
1724       scanner->config->scan_identifier_1char = FALSE;
1725     }
1726   else
1727     g_assert_not_reached ();
1728
1729   scanner->config->scan_float = FALSE;
1730   scanner->config->cpair_comment_single = NULL;
1731 }
1732
1733 static void
1734 gtk_css_scanner_push_scope (GScanner    *scanner,
1735                             ParserScope  scope)
1736 {
1737   GtkCssScannerPrivate *priv;
1738
1739   priv = scanner->user_data;
1740   priv->state = g_slist_prepend (priv->state, GUINT_TO_POINTER (scope));
1741
1742   scanner_apply_scope (scanner, scope);
1743 }
1744
1745 static void
1746 gtk_css_scanner_pop_scope (GScanner *scanner)
1747 {
1748   GtkCssScannerPrivate *priv;
1749   ParserScope scope = SCOPE_SELECTOR;
1750
1751   priv = scanner->user_data;
1752
1753   if (!priv->state)
1754     {
1755       g_warning ("Push/pop calls to parser scope aren't paired");
1756       scanner_apply_scope (scanner, SCOPE_SELECTOR);
1757       return;
1758     }
1759
1760   priv->state = g_slist_delete_link (priv->state, priv->state);
1761
1762   /* Fetch new scope */
1763   if (priv->state)
1764     scope = GPOINTER_TO_INT (priv->state->data);
1765
1766   scanner_apply_scope (scanner, scope);
1767 }
1768
1769 static void
1770 css_provider_reset_parser (GtkCssProvider *css_provider)
1771 {
1772   GtkCssProviderPrivate *priv;
1773
1774   priv = css_provider->priv;
1775
1776   gtk_css_scanner_reset (priv->scanner);
1777
1778   if (priv->error)
1779     g_error_free (priv->error);
1780   priv->error = NULL;
1781 }
1782
1783 static void
1784 css_provider_commit (GtkCssProvider *css_provider,
1785                      GScanner       *scanner)
1786 {
1787   GtkCssScannerPrivate *scanner_priv;
1788   GtkCssProviderPrivate *priv;
1789   GSList *l;
1790
1791   priv = css_provider->priv;
1792   scanner_priv = scanner->user_data;
1793
1794   l = scanner_priv->cur_selectors;
1795
1796   if (g_hash_table_size (scanner_priv->cur_properties) == 0)
1797     return;
1798
1799   while (l)
1800     {
1801       SelectorPath *path = l->data;
1802       SelectorStyleInfo *info;
1803
1804       info = selector_style_info_new (path);
1805       selector_style_info_set_style (info, scanner_priv->cur_properties);
1806
1807       g_ptr_array_add (priv->selectors_info, info);
1808       l = l->next;
1809     }
1810 }
1811
1812 static GTokenType
1813 parse_nth_child (GtkCssProvider *css_provider,
1814                  GScanner       *scanner,
1815                  GtkRegionFlags *flags)
1816 {
1817   ParserSymbol symbol;
1818
1819   g_scanner_get_next_token (scanner);
1820
1821   if (scanner->token != G_TOKEN_SYMBOL)
1822     return G_TOKEN_SYMBOL;
1823
1824   symbol = GPOINTER_TO_INT (scanner->value.v_symbol);
1825
1826   if (symbol == SYMBOL_NTH_CHILD)
1827     {
1828       g_scanner_get_next_token (scanner);
1829
1830       if (scanner->token != G_TOKEN_LEFT_PAREN)
1831         return G_TOKEN_LEFT_PAREN;
1832
1833       gtk_css_scanner_push_scope (scanner, SCOPE_NTH_CHILD);
1834       g_scanner_get_next_token (scanner);
1835
1836       if (scanner->token != G_TOKEN_SYMBOL)
1837         return G_TOKEN_SYMBOL;
1838
1839       symbol = GPOINTER_TO_INT (scanner->value.v_symbol);
1840
1841       switch (symbol)
1842         {
1843         case SYMBOL_NTH_CHILD_EVEN:
1844           *flags = GTK_REGION_EVEN;
1845           break;
1846         case SYMBOL_NTH_CHILD_ODD:
1847           *flags = GTK_REGION_ODD;
1848           break;
1849         case SYMBOL_NTH_CHILD_FIRST:
1850           *flags = GTK_REGION_FIRST;
1851           break;
1852         case SYMBOL_NTH_CHILD_LAST:
1853           *flags = GTK_REGION_LAST;
1854           break;
1855         default:
1856           break;
1857         }
1858
1859       g_scanner_get_next_token (scanner);
1860
1861       if (scanner->token != G_TOKEN_RIGHT_PAREN)
1862         return G_TOKEN_RIGHT_PAREN;
1863
1864       gtk_css_scanner_pop_scope (scanner);
1865     }
1866   else if (symbol == SYMBOL_FIRST_CHILD)
1867     *flags = GTK_REGION_FIRST;
1868   else if (symbol == SYMBOL_LAST_CHILD)
1869     *flags = GTK_REGION_LAST;
1870   else if (symbol == SYMBOL_SORTED_CHILD)
1871     *flags = GTK_REGION_SORTED;
1872   else
1873     {
1874       *flags = 0;
1875       return G_TOKEN_SYMBOL;
1876     }
1877
1878   return G_TOKEN_NONE;
1879 }
1880
1881 static GTokenType
1882 parse_pseudo_class (GtkCssProvider *css_provider,
1883                     GScanner       *scanner,
1884                     SelectorPath   *selector)
1885 {
1886   GtkStateType state;
1887
1888   g_scanner_get_next_token (scanner);
1889
1890   if (scanner->token != G_TOKEN_SYMBOL)
1891     return G_TOKEN_SYMBOL;
1892
1893   state = GPOINTER_TO_INT (scanner->value.v_symbol);
1894
1895   switch (state)
1896     {
1897     case GTK_STATE_ACTIVE:
1898       selector->state |= GTK_STATE_FLAG_ACTIVE;
1899       break;
1900     case GTK_STATE_PRELIGHT:
1901       selector->state |= GTK_STATE_FLAG_PRELIGHT;
1902       break;
1903     case GTK_STATE_SELECTED:
1904       selector->state |= GTK_STATE_FLAG_SELECTED;
1905       break;
1906     case GTK_STATE_INSENSITIVE:
1907       selector->state |= GTK_STATE_FLAG_INSENSITIVE;
1908       break;
1909     case GTK_STATE_INCONSISTENT:
1910       selector->state |= GTK_STATE_FLAG_INCONSISTENT;
1911       break;
1912     case GTK_STATE_FOCUSED:
1913       selector->state |= GTK_STATE_FLAG_FOCUSED;
1914       break;
1915     default:
1916       return G_TOKEN_SYMBOL;
1917     }
1918
1919   return G_TOKEN_NONE;
1920 }
1921
1922 /* Parses a number of concatenated classes */
1923 static void
1924 parse_classes (SelectorPath   *path,
1925                const gchar    *str)
1926 {
1927   gchar *pos;
1928
1929   if ((pos = strchr (str, '.')) != NULL)
1930     {
1931       /* Leave the last class to the call after the loop */
1932       while (pos)
1933         {
1934           *pos = '\0';
1935           selector_path_prepend_class (path, str);
1936
1937           str = pos + 1;
1938           pos = strchr (str, '.');
1939         }
1940     }
1941
1942   selector_path_prepend_class (path, str);
1943 }
1944
1945 static gboolean
1946 is_widget_class_name (const gchar *str)
1947 {
1948   /* Do a pretty lax check here, not all
1949    * widget class names contain only CamelCase
1950    * (gtkmm widgets don't), but at least part of
1951    * the name will be CamelCase, so check for
1952    * the first uppercase char
1953    */
1954   while (*str)
1955     {
1956       if (g_ascii_isupper (*str))
1957         return TRUE;
1958
1959       str++;
1960     }
1961
1962   return FALSE;
1963 }
1964
1965 static GTokenType
1966 parse_selector (GtkCssProvider  *css_provider,
1967                 GScanner        *scanner,
1968                 SelectorPath   **selector_out)
1969 {
1970   SelectorPath *path;
1971
1972   path = selector_path_new ();
1973   *selector_out = path;
1974
1975   if (scanner->token != ':' &&
1976       scanner->token != '#' &&
1977       scanner->token != '.' &&
1978       scanner->token != G_TOKEN_IDENTIFIER)
1979     return G_TOKEN_IDENTIFIER;
1980
1981   while (scanner->token == '#' ||
1982          scanner->token == '.' ||
1983          scanner->token == G_TOKEN_IDENTIFIER)
1984     {
1985       if (scanner->token == '#' ||
1986           scanner->token == '.')
1987         {
1988           gboolean is_class;
1989           gchar *pos;
1990
1991           is_class = (scanner->token == '.');
1992
1993           g_scanner_get_next_token (scanner);
1994
1995           if (scanner->token != G_TOKEN_IDENTIFIER)
1996             return G_TOKEN_IDENTIFIER;
1997
1998           selector_path_prepend_glob (path);
1999           selector_path_prepend_combinator (path, COMBINATOR_CHILD);
2000
2001           if (is_class)
2002             parse_classes (path, scanner->value.v_identifier);
2003           else
2004             {
2005               if ((pos = strchr (scanner->value.v_identifier, '.')) != NULL)
2006                 *pos = '\0';
2007
2008               selector_path_prepend_name (path, scanner->value.v_identifier);
2009
2010               /* Parse any remaining classes */
2011               if (pos)
2012                 parse_classes (path, pos + 1);
2013             }
2014         }
2015       else if (is_widget_class_name (scanner->value.v_identifier))
2016         {
2017           gchar *pos;
2018
2019           if ((pos = strchr (scanner->value.v_identifier, '#')) != NULL ||
2020               (pos = strchr (scanner->value.v_identifier, '.')) != NULL)
2021             {
2022               gchar *type_name, *name;
2023               gboolean is_class;
2024
2025               is_class = (*pos == '.');
2026
2027               /* Widget type and name/class put together */
2028               name = pos + 1;
2029               *pos = '\0';
2030               type_name = scanner->value.v_identifier;
2031
2032               selector_path_prepend_type (path, type_name);
2033
2034               /* This is only so there is a direct relationship
2035                * between widget type and its name.
2036                */
2037               selector_path_prepend_combinator (path, COMBINATOR_CHILD);
2038
2039               if (is_class)
2040                 parse_classes (path, name);
2041               else
2042                 {
2043                   if ((pos = strchr (name, '.')) != NULL)
2044                     *pos = '\0';
2045
2046                   selector_path_prepend_name (path, name);
2047
2048                   /* Parse any remaining classes */
2049                   if (pos)
2050                     parse_classes (path, pos + 1);
2051                 }
2052             }
2053           else
2054             selector_path_prepend_type (path, scanner->value.v_identifier);
2055         }
2056       else if (_gtk_style_context_check_region_name (scanner->value.v_identifier))
2057         {
2058           GtkRegionFlags flags = 0;
2059           gchar *region_name;
2060
2061           region_name = g_strdup (scanner->value.v_identifier);
2062
2063           if (g_scanner_peek_next_token (scanner) == ':')
2064             {
2065               ParserSymbol symbol;
2066
2067               g_scanner_get_next_token (scanner);
2068               gtk_css_scanner_push_scope (scanner, SCOPE_PSEUDO_CLASS);
2069
2070               /* Check for the next token being nth-child, parse in that
2071                * case, and fallback into common state parsing if not.
2072                */
2073               if (g_scanner_peek_next_token (scanner) != G_TOKEN_SYMBOL)
2074                 return G_TOKEN_SYMBOL;
2075
2076               symbol = GPOINTER_TO_INT (scanner->next_value.v_symbol);
2077
2078               if (symbol == SYMBOL_FIRST_CHILD ||
2079                   symbol == SYMBOL_LAST_CHILD ||
2080                   symbol == SYMBOL_NTH_CHILD ||
2081                   symbol == SYMBOL_SORTED_CHILD)
2082                 {
2083                   GTokenType token;
2084
2085                   if ((token = parse_nth_child (css_provider, scanner, &flags)) != G_TOKEN_NONE)
2086                     return token;
2087
2088                   gtk_css_scanner_pop_scope (scanner);
2089                 }
2090               else
2091                 {
2092                   gtk_css_scanner_pop_scope (scanner);
2093                   selector_path_prepend_region (path, region_name, 0);
2094                   g_free (region_name);
2095                   break;
2096                 }
2097             }
2098
2099           selector_path_prepend_region (path, region_name, flags);
2100           g_free (region_name);
2101         }
2102       else if (scanner->value.v_identifier[0] == '*')
2103         selector_path_prepend_glob (path);
2104       else
2105         return G_TOKEN_IDENTIFIER;
2106
2107       g_scanner_get_next_token (scanner);
2108
2109       if (scanner->token == '>')
2110         {
2111           selector_path_prepend_combinator (path, COMBINATOR_CHILD);
2112           g_scanner_get_next_token (scanner);
2113         }
2114     }
2115
2116   if (scanner->token == ':')
2117     {
2118       /* Add glob selector if path is empty */
2119       if (selector_path_depth (path) == 0)
2120         selector_path_prepend_glob (path);
2121
2122       gtk_css_scanner_push_scope (scanner, SCOPE_PSEUDO_CLASS);
2123
2124       while (scanner->token == ':')
2125         {
2126           GTokenType token;
2127
2128           if ((token = parse_pseudo_class (css_provider, scanner, path)) != G_TOKEN_NONE)
2129             return token;
2130
2131           g_scanner_get_next_token (scanner);
2132         }
2133
2134       gtk_css_scanner_pop_scope (scanner);
2135     }
2136
2137   return G_TOKEN_NONE;
2138 }
2139
2140 static void
2141 resolve_binding_sets (const gchar *value_str,
2142                       GValue      *value)
2143 {
2144   GPtrArray *array;
2145   gchar **bindings, **str;
2146
2147   bindings = g_strsplit (value_str, ",", -1);
2148   array = g_ptr_array_new ();
2149
2150   for (str = bindings; *str; str++)
2151     {
2152       GtkBindingSet *binding_set;
2153
2154       binding_set = gtk_binding_set_find (g_strstrip (*str));
2155
2156       if (!binding_set)
2157         continue;
2158
2159       g_ptr_array_add (array, binding_set);
2160     }
2161
2162   g_value_take_boxed (value, array);
2163   g_strfreev (bindings);
2164 }
2165
2166 static GTokenType
2167 parse_rule (GtkCssProvider  *css_provider,
2168             GScanner        *scanner)
2169 {
2170   GtkCssScannerPrivate *priv;
2171   GTokenType expected_token;
2172   SelectorPath *selector;
2173
2174   priv = scanner->user_data;
2175
2176   gtk_css_scanner_push_scope (scanner, SCOPE_SELECTOR);
2177
2178   /* Handle directives */
2179   if (scanner->token == G_TOKEN_IDENTIFIER &&
2180       scanner->value.v_identifier[0] == '@')
2181     {
2182       gchar *directive;
2183
2184       directive = &scanner->value.v_identifier[1];
2185
2186       if (strcmp (directive, "define-color") == 0)
2187         {
2188           GtkSymbolicColor *color;
2189           gchar *color_name, *color_str;
2190           GError *error = NULL;
2191
2192           /* Directive is a color mapping */
2193           g_scanner_get_next_token (scanner);
2194
2195           if (scanner->token != G_TOKEN_IDENTIFIER)
2196             {
2197               gtk_css_provider_invalid_token (css_provider, scanner, "Color name");
2198               return G_TOKEN_IDENTIFIER;
2199             }
2200
2201           color_name = g_strdup (scanner->value.v_identifier);
2202           gtk_css_scanner_push_scope (scanner, SCOPE_VALUE);
2203           g_scanner_get_next_token (scanner);
2204
2205           if (scanner->token != G_TOKEN_IDENTIFIER)
2206             {
2207               gtk_css_provider_invalid_token (css_provider, scanner, "Color definition");
2208               return G_TOKEN_IDENTIFIER;
2209             }
2210
2211           color_str = g_strstrip (scanner->value.v_identifier);
2212           color = _gtk_css_parse_symbolic_color (color_str, &error);
2213           if (!color)
2214             {
2215               gtk_css_provider_take_error (css_provider, scanner, error);
2216               return G_TOKEN_IDENTIFIER;
2217             }
2218
2219           g_hash_table_insert (css_provider->priv->symbolic_colors, color_name, color);
2220
2221           gtk_css_scanner_pop_scope (scanner);
2222           g_scanner_get_next_token (scanner);
2223
2224           if (scanner->token != ';')
2225             return ';';
2226
2227           return G_TOKEN_NONE;
2228         }
2229       else if (strcmp (directive, "import") == 0)
2230         {
2231           GScanner *new_scanner;
2232           gboolean loaded;
2233           gchar *path = NULL;
2234           GFile *base, *actual;
2235           char *dirname;
2236           GError *error = NULL;
2237
2238           gtk_css_scanner_push_scope (scanner, SCOPE_VALUE);
2239           g_scanner_get_next_token (scanner);
2240
2241           if (scanner->token == G_TOKEN_IDENTIFIER &&
2242               g_str_has_prefix (scanner->value.v_identifier, "url"))
2243             path = g_strstrip (scanner->value.v_identifier);
2244           else if (scanner->token == G_TOKEN_STRING)
2245             path = g_strstrip (scanner->value.v_string);
2246           else
2247             {
2248               gtk_css_provider_invalid_token (css_provider, scanner, "File URL");
2249               return G_TOKEN_IDENTIFIER;
2250             }
2251
2252           if (scanner->input_name)
2253             dirname = g_path_get_dirname (scanner->input_name);
2254           else
2255             dirname = g_get_current_dir ();
2256
2257           base = g_file_new_for_path (dirname);
2258           g_free (dirname);
2259
2260           actual = _gtk_css_parse_url (base, path, NULL, &error);
2261           g_object_unref (base);
2262
2263           if (actual == NULL)
2264             {
2265               gtk_css_provider_take_error (css_provider, scanner, error);
2266               return G_TOKEN_IDENTIFIER;
2267             }
2268
2269           gtk_css_scanner_pop_scope (scanner);
2270           g_scanner_get_next_token (scanner);
2271
2272           if (scanner->token != ';')
2273             {
2274               g_object_unref (actual);
2275               return ';';
2276             }
2277
2278           path = g_file_get_path (actual);
2279           g_object_unref (actual);
2280
2281           new_scanner = gtk_css_provider_create_scanner (css_provider);
2282           css_provider->priv->scanner = new_scanner;
2283
2284           /* FIXME: Avoid recursive importing */
2285           loaded = gtk_css_provider_load_from_path_internal (css_provider, path,
2286                                                              FALSE, NULL);
2287
2288           /* Restore previous state */
2289           gtk_css_scanner_destroy (new_scanner);
2290           css_provider->priv->scanner = scanner;
2291
2292           g_free (path);
2293
2294           if (!loaded)
2295             return G_TOKEN_IDENTIFIER;
2296           else
2297             return G_TOKEN_NONE;
2298         }
2299       else if (strcmp (directive, "binding-set") == 0)
2300         {
2301           GtkBindingSet *binding_set;
2302           gchar *binding_set_name;
2303
2304           g_scanner_get_next_token (scanner);
2305
2306           if (scanner->token != G_TOKEN_IDENTIFIER)
2307             {
2308               gtk_css_provider_invalid_token (css_provider, scanner, "Binding name");
2309               return G_TOKEN_IDENTIFIER;
2310             }
2311
2312           binding_set_name = scanner->value.v_identifier;
2313           binding_set = gtk_binding_set_find (binding_set_name);
2314
2315           if (!binding_set)
2316             {
2317               binding_set = gtk_binding_set_new (binding_set_name);
2318               binding_set->parsed = TRUE;
2319             }
2320
2321           g_scanner_get_next_token (scanner);
2322
2323           if (scanner->token != G_TOKEN_LEFT_CURLY)
2324             return G_TOKEN_LEFT_CURLY;
2325
2326           gtk_css_scanner_push_scope (scanner, SCOPE_BINDING_SET);
2327           g_scanner_get_next_token (scanner);
2328
2329           do
2330             {
2331               GTokenType ret;
2332
2333               if (scanner->token != G_TOKEN_IDENTIFIER)
2334                 {
2335                   gtk_css_provider_invalid_token (css_provider, scanner, "Binding definition");
2336                   return G_TOKEN_IDENTIFIER;
2337                 }
2338
2339               ret = gtk_binding_entry_add_signal_from_string (binding_set,
2340                                                               scanner->value.v_identifier);
2341               if (ret != G_TOKEN_NONE)
2342                 {
2343                   gtk_css_provider_invalid_token (css_provider, scanner, "Binding definition");
2344                   return ret;
2345                 }
2346
2347               g_scanner_get_next_token (scanner);
2348
2349               if (scanner->token != ';')
2350                 return ';';
2351
2352               g_scanner_get_next_token (scanner);
2353             }
2354           while (scanner->token != G_TOKEN_RIGHT_CURLY);
2355
2356           gtk_css_scanner_pop_scope (scanner);
2357           g_scanner_get_next_token (scanner);
2358
2359           return G_TOKEN_NONE;
2360         }
2361       else
2362         {
2363           gtk_css_provider_invalid_token (css_provider, scanner, "Directive");
2364           return G_TOKEN_IDENTIFIER;
2365         }
2366     }
2367
2368   expected_token = parse_selector (css_provider, scanner, &selector);
2369
2370   if (expected_token != G_TOKEN_NONE)
2371     {
2372       selector_path_unref (selector);
2373       gtk_css_provider_invalid_token (css_provider, scanner, "Selector");
2374       return expected_token;
2375     }
2376
2377   priv->cur_selectors = g_slist_prepend (priv->cur_selectors, selector);
2378
2379   while (scanner->token == ',')
2380     {
2381       g_scanner_get_next_token (scanner);
2382
2383       expected_token = parse_selector (css_provider, scanner, &selector);
2384
2385       if (expected_token != G_TOKEN_NONE)
2386         {
2387           selector_path_unref (selector);
2388           gtk_css_provider_invalid_token (css_provider, scanner, "Selector");
2389           return expected_token;
2390         }
2391
2392       priv->cur_selectors = g_slist_prepend (priv->cur_selectors, selector);
2393     }
2394
2395   gtk_css_scanner_pop_scope (scanner);
2396
2397   if (scanner->token != G_TOKEN_LEFT_CURLY)
2398     return G_TOKEN_LEFT_CURLY;
2399
2400   /* Declarations parsing */
2401   gtk_css_scanner_push_scope (scanner, SCOPE_DECLARATION);
2402
2403   g_scanner_get_next_token (scanner);
2404
2405   while (scanner->token != G_TOKEN_RIGHT_CURLY &&
2406          !g_scanner_eof (scanner))
2407     {
2408       gchar *value_str = NULL;
2409       GtkStylePropertyParser parse_func = NULL;
2410       GParamSpec *pspec = NULL;;
2411       gchar *prop;
2412
2413       if (scanner->token == ';')
2414         {
2415           g_scanner_get_next_token (scanner);
2416           continue;
2417         }
2418
2419       if (scanner->token != G_TOKEN_IDENTIFIER)
2420         {
2421           gtk_css_provider_error_literal (css_provider,
2422                                           scanner,
2423                                           GTK_CSS_PROVIDER_ERROR,
2424                                           GTK_CSS_PROVIDER_ERROR_PROPERTY_NAME,
2425                                           "Expected a valid property name");
2426           goto find_end_of_declaration;
2427         }
2428
2429       prop = g_strdup (scanner->value.v_identifier);
2430
2431       if (!gtk_style_properties_lookup_property (prop, &parse_func, &pspec) &&
2432           prop[0] != '-')
2433         {
2434           gtk_css_provider_error (css_provider,
2435                                   scanner,
2436                                   GTK_CSS_PROVIDER_ERROR,
2437                                   GTK_CSS_PROVIDER_ERROR_PROPERTY_NAME,
2438                                   "'%s' is not a valid property name",
2439                                   prop);
2440           g_free (prop);
2441           goto find_end_of_declaration;
2442         }
2443
2444       g_scanner_get_next_token (scanner);
2445
2446       if (scanner->token != ':')
2447         {
2448           g_free (prop);
2449           gtk_css_provider_invalid_token (css_provider, scanner, "':'");
2450           goto find_end_of_declaration;
2451         }
2452
2453       gtk_css_scanner_push_scope (scanner, SCOPE_VALUE);
2454       g_scanner_get_next_token (scanner);
2455
2456       if (scanner->token != G_TOKEN_IDENTIFIER)
2457         {
2458           g_free (prop);
2459           /* the error value here is hacky. But strings should be used for
2460            * strings really, so a string is not a syntax error but a broken
2461            * value for everything that we support. */
2462           gtk_css_provider_error (css_provider,
2463                                   scanner,
2464                                   GTK_CSS_PROVIDER_ERROR,
2465                                   scanner->token == G_TOKEN_STRING ? GTK_CSS_PROVIDER_ERROR_PROPERTY_VALUE
2466                                                                    : GTK_CSS_PROVIDER_ERROR_SYNTAX,
2467                                   "Not a property value");
2468           gtk_css_scanner_pop_scope (scanner);
2469           goto find_end_of_declaration;
2470         }
2471
2472       value_str = scanner->value.v_identifier;
2473       g_strchomp (value_str);
2474
2475       gtk_css_scanner_pop_scope (scanner);
2476       g_scanner_peek_next_token (scanner);
2477
2478       if (scanner->next_token != ';' &&
2479           scanner->next_token != G_TOKEN_RIGHT_CURLY &&
2480           scanner->next_token != G_TOKEN_EOF)
2481         {
2482           gtk_css_provider_invalid_token (css_provider, scanner, "';'");
2483           g_free (prop);
2484           goto find_end_of_declaration;
2485         }
2486
2487       if (pspec)
2488         {
2489           GValue *val;
2490
2491           val = g_slice_new0 (GValue);
2492           g_value_init (val, pspec->value_type);
2493
2494           if (strcmp (value_str, "none") == 0)
2495             {
2496               /* Insert the default value, so it has an opportunity
2497                * to override other style providers when merged
2498                */
2499               g_param_value_set_default (pspec, val);
2500               g_hash_table_insert (priv->cur_properties, prop, val);
2501             }
2502           else if (strcmp (prop, "gtk-key-bindings") == 0)
2503             {
2504               /* Private property holding the binding sets */
2505               resolve_binding_sets (value_str, val);
2506               g_hash_table_insert (priv->cur_properties, prop, val);
2507             }
2508           else if (pspec->value_type == G_TYPE_STRING)
2509             {
2510               g_value_set_string (val, value_str);
2511               g_hash_table_insert (priv->cur_properties, prop, val);
2512             }
2513           else if (parse_func)
2514             {
2515               GError *error = NULL;
2516
2517               if ((*parse_func) (value_str, val, &error))
2518                 g_hash_table_insert (priv->cur_properties, prop, val);
2519               else
2520                 gtk_css_provider_take_error (css_provider, scanner, error);
2521             }
2522           else
2523             {
2524               GError *error = NULL;
2525               GFile *base;
2526               char *dirname;
2527               gboolean success;
2528
2529               if (scanner->input_name)
2530                 dirname = g_path_get_dirname (scanner->input_name);
2531               else
2532                 dirname = g_get_current_dir ();
2533
2534               base = g_file_new_for_path (dirname);
2535               g_free (dirname);
2536
2537               success = _gtk_css_value_from_string (val,
2538                                                     base,
2539                                                     value_str,
2540                                                     &error);
2541
2542               g_object_unref (base);
2543
2544               if (success)
2545                 {
2546                   g_hash_table_insert (priv->cur_properties, prop, val);
2547                 }
2548               else
2549                 {
2550                   g_value_unset (val);
2551                   g_slice_free (GValue, val);
2552                   g_free (prop);
2553
2554                   gtk_css_provider_take_error (css_provider, scanner, error);
2555                 }
2556             }
2557         }
2558       else if (prop[0] == '-')
2559         {
2560           GValue *val;
2561
2562           val = g_slice_new0 (GValue);
2563           g_value_init (val, G_TYPE_STRING);
2564           g_value_set_string (val, value_str);
2565
2566           g_hash_table_insert (priv->cur_properties, prop, val);
2567         }
2568       else
2569         g_free (prop);
2570
2571       g_scanner_get_next_token (scanner);
2572
2573       if (g_scanner_eof (scanner))
2574         {
2575           gtk_css_provider_invalid_token (css_provider, scanner, "}");
2576           break;
2577         }
2578
2579 find_end_of_declaration:
2580       while (scanner->token != ';' &&
2581              scanner->token != G_TOKEN_RIGHT_CURLY &&
2582              !g_scanner_eof (scanner))
2583         g_scanner_get_next_token (scanner);
2584     }
2585
2586   gtk_css_scanner_pop_scope (scanner);
2587
2588   return G_TOKEN_NONE;
2589 }
2590
2591 static void
2592 gtk_css_provider_reset (GtkCssProvider *css_provider)
2593 {
2594   GtkCssProviderPrivate *priv;
2595
2596   priv = css_provider->priv;
2597
2598   if (priv->selectors_info->len > 0)
2599     g_ptr_array_remove_range (priv->selectors_info, 0, priv->selectors_info->len);
2600 }
2601
2602
2603 static gboolean
2604 parse_stylesheet (GtkCssProvider  *css_provider,
2605                   GScanner        *scanner,
2606                   GError         **error)
2607 {
2608   GtkCssProviderPrivate *priv;
2609   gboolean result;
2610
2611   result = TRUE;
2612
2613   priv = css_provider->priv;
2614   g_scanner_get_next_token (scanner);
2615
2616   while (!g_scanner_eof (scanner))
2617     {
2618       GTokenType expected_token;
2619
2620       css_provider_reset_parser (css_provider);
2621       expected_token = parse_rule (css_provider, scanner);
2622
2623       if (expected_token != G_TOKEN_NONE)
2624         {
2625           css_provider_reset_parser (css_provider);
2626
2627           while (!g_scanner_eof (scanner) &&
2628                  scanner->token != G_TOKEN_RIGHT_CURLY)
2629             g_scanner_get_next_token (scanner);
2630         }
2631       else
2632         css_provider_commit (css_provider, scanner);
2633
2634       g_scanner_get_next_token (scanner);
2635     }
2636
2637   return result;
2638 }
2639
2640 /**
2641  * gtk_css_provider_load_from_data:
2642  * @css_provider: a #GtkCssProvider
2643  * @data: CSS data loaded in memory
2644  * @length: the length of @data in bytes, or -1 for NUL terminated strings
2645  * @error: (out) (allow-none): return location for a #GError, or %NULL
2646  *
2647  * Loads @data into @css_provider, making it clear any previously loaded
2648  * information.
2649  *
2650  * Returns: %TRUE if the data could be loaded.
2651  **/
2652 gboolean
2653 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2654                                  const gchar     *data,
2655                                  gssize           length,
2656                                  GError         **error)
2657 {
2658   GtkCssProviderPrivate *priv;
2659
2660   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2661   g_return_val_if_fail (data != NULL, FALSE);
2662
2663   priv = css_provider->priv;
2664
2665   if (length < 0)
2666     length = strlen (data);
2667
2668   gtk_css_provider_reset (css_provider);
2669
2670   priv->scanner->input_name = NULL;
2671   g_scanner_input_text (priv->scanner, data, (guint) length);
2672
2673   return parse_stylesheet (css_provider, priv->scanner, error);
2674 }
2675
2676 /**
2677  * gtk_css_provider_load_from_file:
2678  * @css_provider: a #GtkCssProvider
2679  * @file: #GFile pointing to a file to load
2680  * @error: (out) (allow-none): return location for a #GError, or %NULL
2681  *
2682  * Loads the data contained in @file into @css_provider, making it
2683  * clear any previously loaded information.
2684  *
2685  * Returns: %TRUE if the data could be loaded.
2686  **/
2687 gboolean
2688 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2689                                  GFile           *file,
2690                                  GError         **error)
2691 {
2692   GtkCssProviderPrivate *priv;
2693   GError *internal_error = NULL;
2694   char *path;
2695   gchar *data;
2696   gsize length;
2697   gboolean ret;
2698
2699   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2700   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2701
2702   priv = css_provider->priv;
2703
2704   if (!g_file_load_contents (file, NULL,
2705                              &data, &length,
2706                              NULL, &internal_error))
2707     {
2708       g_propagate_error (error, internal_error);
2709       return FALSE;
2710     }
2711
2712   gtk_css_provider_reset (css_provider);
2713
2714   path = g_file_get_path (file);
2715   priv->scanner->input_name = path;
2716   g_scanner_input_text (priv->scanner, data, (guint) length);
2717
2718   ret = parse_stylesheet (css_provider, priv->scanner, error);
2719
2720   g_free (path);
2721   priv->scanner->input_name = NULL;
2722   g_free (data);
2723
2724   return ret;
2725 }
2726
2727 static gboolean
2728 gtk_css_provider_load_from_path_internal (GtkCssProvider  *css_provider,
2729                                           const gchar     *path,
2730                                           gboolean         reset,
2731                                           GError         **error)
2732 {
2733   GtkCssProviderPrivate *priv;
2734   GError *internal_error = NULL;
2735   GMappedFile *mapped_file;
2736   const gchar *data;
2737   gsize length;
2738   gboolean ret;
2739
2740   priv = css_provider->priv;
2741
2742   mapped_file = g_mapped_file_new (path, FALSE, &internal_error);
2743
2744   if (internal_error)
2745     {
2746       g_propagate_error (error, internal_error);
2747       return FALSE;
2748     }
2749
2750   length = g_mapped_file_get_length (mapped_file);
2751   data = g_mapped_file_get_contents (mapped_file);
2752
2753   if (!data)
2754     data = "";
2755
2756   if (reset)
2757     gtk_css_provider_reset (css_provider);
2758
2759   priv->scanner->input_name = path;
2760   g_scanner_input_text (priv->scanner, data, (guint) length);
2761
2762   ret = parse_stylesheet (css_provider, priv->scanner, error);
2763
2764   priv->scanner->input_name = NULL;
2765
2766   g_mapped_file_unref (mapped_file);
2767
2768   return ret;
2769 }
2770
2771 /**
2772  * gtk_css_provider_load_from_path:
2773  * @css_provider: a #GtkCssProvider
2774  * @path: the path of a filename to load, in the GLib filename encoding
2775  * @error: (out) (allow-none): return location for a #GError, or %NULL
2776  *
2777  * Loads the data contained in @path into @css_provider, making it clear
2778  * any previously loaded information.
2779  *
2780  * Returns: %TRUE if the data could be loaded.
2781  **/
2782 gboolean
2783 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2784                                  const gchar     *path,
2785                                  GError         **error)
2786 {
2787   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2788   g_return_val_if_fail (path != NULL, FALSE);
2789
2790   return gtk_css_provider_load_from_path_internal (css_provider, path,
2791                                                    TRUE, error);
2792 }
2793
2794 /**
2795  * gtk_css_provider_get_default:
2796  *
2797  * Returns the provider containing the style settings used as a
2798  * fallback for all widgets.
2799  *
2800  * Returns: (transfer none): The provider used for fallback styling.
2801  *          This memory is owned by GTK+, and you must not free it.
2802  **/
2803 GtkCssProvider *
2804 gtk_css_provider_get_default (void)
2805 {
2806   static GtkCssProvider *provider;
2807
2808   if (G_UNLIKELY (!provider))
2809     {
2810       const gchar *str =
2811         "@define-color fg_color #000; \n"
2812         "@define-color bg_color #dcdad5; \n"
2813         "@define-color text_color #000; \n"
2814         "@define-color base_color #fff; \n"
2815         "@define-color selected_bg_color #4b6983; \n"
2816         "@define-color selected_fg_color #fff; \n"
2817         "@define-color tooltip_bg_color #eee1b3; \n"
2818         "@define-color tooltip_fg_color #000; \n"
2819         "@define-color placeholder_text_color #808080; \n"
2820         "\n"
2821         "@define-color info_fg_color rgb (181, 171, 156);\n"
2822         "@define-color info_bg_color rgb (252, 252, 189);\n"
2823         "@define-color warning_fg_color rgb (173, 120, 41);\n"
2824         "@define-color warning_bg_color rgb (250, 173, 61);\n"
2825         "@define-color question_fg_color rgb (97, 122, 214);\n"
2826         "@define-color question_bg_color rgb (138, 173, 212);\n"
2827         "@define-color error_fg_color rgb (166, 38, 38);\n"
2828         "@define-color error_bg_color rgb (237, 54, 54);\n"
2829         "\n"
2830         "* {\n"
2831         "  background-color: @bg_color;\n"
2832         "  color: @fg_color;\n"
2833         "  border-color: shade (@bg_color, 0.6);\n"
2834         "  padding: 2;\n"
2835         "  border-width: 0;\n"
2836         "}\n"
2837         "\n"
2838         "*:prelight {\n"
2839         "  background-color: shade (@bg_color, 1.05);\n"
2840         "  color: shade (@fg_color, 1.3);\n"
2841         "}\n"
2842         "\n"
2843         "*:selected {\n"
2844         "  background-color: @selected_bg_color;\n"
2845         "  color: @selected_fg_color;\n"
2846         "}\n"
2847         "\n"
2848         ".expander, GtkTreeView.view.expander {\n"
2849         "  color: #fff;\n"
2850         "}\n"
2851         "\n"
2852         ".expander:prelight,\n"
2853         "GtkTreeView.view.expander:selected:prelight {\n"
2854         "  color: @text_color;\n"
2855         "}\n"
2856         "\n"
2857         ".expander:active {\n"
2858         "  transition: 200ms linear;\n"
2859         "}\n"
2860         "\n"
2861         "*:insensitive {\n"
2862         "  border-color: shade (@bg_color, 0.7);\n"
2863         "  background-color: shade (@bg_color, 0.9);\n"
2864         "  color: shade (@bg_color, 0.7);\n"
2865         "}\n"
2866         "\n"
2867         ".view {\n"
2868         "  border-width: 0;\n"
2869         "  border-radius: 0;\n"
2870         "  background-color: @base_color;\n"
2871         "  color: @text_color;\n"
2872         "}\n"
2873         ".view:selected {\n"
2874         "  background-color: shade (@bg_color, 0.9);\n"
2875         "  color: @fg_color;\n"
2876         "}\n"
2877         "\n"
2878         ".view:selected:focused {\n"
2879         "  background-color: @selected_bg_color;\n"
2880         "  color: @selected_fg_color;\n"
2881         "}\n"
2882         "\n"
2883         ".view column:sorted row,\n"
2884         ".view column:sorted row:prelight {\n"
2885         "  background-color: shade (@bg_color, 0.85);\n"
2886         "}\n"
2887         "\n"
2888         ".view column:sorted row:nth-child(odd),\n"
2889         ".view column:sorted row:nth-child(odd):prelight {\n"
2890         "  background-color: shade (@bg_color, 0.8);\n"
2891         "}\n"
2892         "\n"
2893         ".view row,\n"
2894         ".view row:prelight {\n"
2895         "  background-color: @base_color;\n"
2896         "  color: @text_color;\n"
2897         "}\n"
2898         "\n"
2899         ".view row:nth-child(odd),\n"
2900         ".view row:nth-child(odd):prelight {\n"
2901         "  background-color: shade (@base_color, 0.93); \n"
2902         "}\n"
2903         "\n"
2904         ".view row:selected:focused {\n"
2905         "  background-color: @selected_bg_color;\n"
2906         "}\n"
2907         "\n"
2908         ".view row:selected {\n"
2909         "  background-color: darker (@bg_color);\n"
2910         "  color: @selected_fg_color;\n"
2911         "}\n"
2912         "\n"
2913         ".view.cell.trough,\n"
2914         ".view.cell.trough:hover,\n"
2915         ".view.cell.trough:selected,\n"
2916         ".view.cell.trough:selected:focused {\n"
2917         "  background-color: @bg_color;\n"
2918         "  color: @fg_color;\n"
2919         "}\n"
2920         "\n"
2921         ".view.cell.progressbar,\n"
2922         ".view.cell.progressbar:hover,\n"
2923         ".view.cell.progressbar:selected,\n"
2924         ".view.cell.progressbar:selected:focused {\n"
2925         "  background-color: @selected_bg_color;\n"
2926         "  color: @selected_fg_color;\n"
2927         "}\n"
2928         "\n"
2929         ".rubberband {\n"
2930         "  background-color: alpha (@fg_color, 0.25);\n"
2931         "  border-color: @fg_color;\n"
2932         "  border-style: solid;\n"
2933         "  border-width: 1;\n"
2934         "}\n"
2935         "\n"
2936         ".tooltip {\n"
2937         "  background-color: @tooltip_bg_color; \n"
2938         "  color: @tooltip_fg_color; \n"
2939         "  border-color: @tooltip_fg_color; \n"
2940         "  border-width: 1;\n"
2941         "  border-style: solid;\n"
2942         "}\n"
2943         "\n"
2944         ".button,\n"
2945         ".slider {\n"
2946         "  border-style: outset; \n"
2947         "  border-width: 2; \n"
2948         "}\n"
2949         "\n"
2950         ".button:active {\n"
2951         "  background-color: shade (@bg_color, 0.7);\n"
2952         "  border-style: inset; \n"
2953         "}\n"
2954         "\n"
2955         ".button:prelight,\n"
2956         ".slider:prelight {\n"
2957         "  background-color: @selected_bg_color;\n"
2958         "  color: @selected_fg_color;\n"
2959         "  border-color: shade (@selected_bg_color, 0.7);\n"
2960         "}\n"
2961         "\n"
2962         ".trough {\n"
2963         "  background-color: darker (@bg_color);\n"
2964         "  border-style: inset;\n"
2965         "  border-width: 1;\n"
2966         "  padding: 0;\n"
2967         "}\n"
2968         "\n"
2969         ".entry {\n"
2970         "  border-style: inset;\n"
2971         "  border-width: 2;\n"
2972         "  background-color: @base_color;\n"
2973         "  color: @text_color;\n"
2974         "}\n"
2975         "\n"
2976         ".entry:insensitive {\n"
2977         "  background-color: shade (@base_color, 0.9);\n"
2978         "  color: shade (@base_color, 0.7);\n"
2979         "}\n"
2980         ".entry:active {\n"
2981         "  background-color: #c4c2bd;\n"
2982         "  color: #000;\n"
2983         "}\n"
2984         "\n"
2985         ".progressbar,\n"
2986         ".entry.progressbar, \n"
2987         ".cell.progressbar {\n"
2988         "  background-color: @selected_bg_color;\n"
2989         "  border-color: shade (@selected_bg_color, 0.7);\n"
2990         "  color: @selected_fg_color;\n"
2991         "  border-style: outset;\n"
2992         "  border-width: 1;\n"
2993         "}\n"
2994         "\n"
2995         "GtkCheckButton:hover,\n"
2996         "GtkCheckButton:selected,\n"
2997         "GtkRadioButton:hover,\n"
2998         "GtkRadioButton:selected {\n"
2999         "  background-color: shade (@bg_color, 1.05);\n"
3000         "}\n"
3001         "\n"
3002         ".check, .radio,"
3003         ".cell.check, .cell.radio,\n"
3004         ".cell.check:hover, .cell.radio:hover {\n"
3005         "  border-style: solid;\n"
3006         "  border-width: 1;\n"
3007         "  background-color: @base_color;\n"
3008         "  border-color: @fg_color;\n"
3009         "}\n"
3010         "\n"
3011         ".check:active, .radio:active,\n"
3012         ".check:hover, .radio:hover {\n"
3013         "  background-color: @base_color;\n"
3014         "  border-color: @fg_color;\n"
3015         "  color: @text_color;\n"
3016         "}\n"
3017         "\n"
3018         ".check:selected, .radio:selected {\n"
3019         "  background-color: darker (@bg_color);\n"
3020         "  color: @selected_fg_color;\n"
3021         "  border-color: @selected_fg_color;\n"
3022         "}\n"
3023         "\n"
3024         ".check:selected:focused, .radio:selected:focused {\n"
3025         "  background-color: @selected_bg_color;\n"
3026         "}\n"
3027         "\n"
3028         ".menu.check, .menu.radio {\n"
3029         "  color: @fg_color;\n"
3030         "  border-style: none;\n"
3031         "  border-width: 0;\n"
3032         "}\n"
3033         "\n"
3034         ".popup {\n"
3035         "  border-style: outset;\n"
3036         "  border-width: 1;\n"
3037         "}\n"
3038         "\n"
3039         ".viewport {\n"
3040         "  border-style: inset;\n"
3041         "  border-width: 2;\n"
3042         "}\n"
3043         "\n"
3044         ".notebook {\n"
3045         "  border-style: outset;\n"
3046         "  border-width: 1;\n"
3047         "}\n"
3048         "\n"
3049         ".frame {\n"
3050         "  border-style: inset;\n"
3051         "  border-width: 1;\n"
3052         "}\n"
3053         "\n"
3054         "GtkScrolledWindow.frame {\n"
3055         "  padding: 0;\n"
3056         "}\n"
3057         "\n"
3058         ".menu,\n"
3059         ".menubar,\n"
3060         ".toolbar {\n"
3061         "  border-style: outset;\n"
3062         "  border-width: 1;\n"
3063         "}\n"
3064         "\n"
3065         ".menu:hover,\n"
3066         ".menubar:hover,\n"
3067         ".menu.check:hover,\n"
3068         ".menu.radio:hover {\n"
3069         "  background-color: @selected_bg_color;\n"
3070         "  color: @selected_fg_color;\n"
3071         "}\n"
3072         "\n"
3073         "GtkSpinButton.button {\n"
3074         "  border-width: 1;\n"
3075         "}\n"
3076         "\n"
3077         ".scale.slider:hover,\n"
3078         "GtkSpinButton.button:hover {\n"
3079         "  background-color: shade (@bg_color, 1.05);\n"
3080         "  border-color: shade (@bg_color, 0.8);\n"
3081         "}\n"
3082         "\n"
3083         "GtkSwitch.trough:active {\n"
3084         "  background-color: @selected_bg_color;\n"
3085         "  color: @selected_fg_color;\n"
3086         "}\n"
3087         "\n"
3088         "GtkToggleButton.button:inconsistent {\n"
3089         "  border-style: outset;\n"
3090         "  border-width: 1px;\n"
3091         "  background-color: shade (@bg_color, 0.9);\n"
3092         "  border-color: shade (@bg_color, 0.7);\n"
3093         "}\n"
3094         "\n"
3095         "GtkLabel:selected {\n"
3096         "  background-color: shade (@bg_color, 0.9);\n"
3097         "}\n"
3098         "\n"
3099         "GtkLabel:selected:focused {\n"
3100         "  background-color: @selected_bg_color;\n"
3101         "}\n"
3102         "\n"
3103         ".spinner:active {\n"
3104         "  transition: 750ms linear loop;\n"
3105         "}\n"
3106         "\n"
3107         ".info {\n"
3108         "  background-color: @info_bg_color;\n"
3109         "  color: @info_fg_color;\n"
3110         "}\n"
3111         "\n"
3112         ".warning {\n"
3113         "  background-color: @warning_bg_color;\n"
3114         "  color: @warning_fg_color;\n"
3115         "}\n"
3116         "\n"
3117         ".question {\n"
3118         "  background-color: @question_bg_color;\n"
3119         "  color: @question_fg_color;\n"
3120         "}\n"
3121         "\n"
3122         ".error {\n"
3123         "  background-color: @error_bg_color;\n"
3124         "  color: @error_fg_color;\n"
3125         "}\n"
3126         "\n"
3127         ".highlight {\n"
3128         "  background-color: @selected_bg_color;\n"
3129         "  color: @selected_fg_color;\n"
3130         "}\n"
3131         "\n"
3132         ".light-area-focus {\n"
3133         "  color: #000;\n"
3134         "}\n"
3135         "\n"
3136         ".dark-area-focus {\n"
3137         "  color: #fff;\n"
3138         "}\n"
3139         "GtkCalendar.view {\n"
3140         "  border-width: 1;\n"
3141         "  border-style: inset;\n"
3142         "  padding: 1;\n"
3143         "}\n"
3144         "\n"
3145         "GtkCalendar.view:inconsistent {\n"
3146         "  color: darker (@bg_color);\n"
3147         "}\n"
3148         "\n"
3149         "GtkCalendar.header {\n"
3150         "  background-color: @bg_color;\n"
3151         "  border-style: outset;\n"
3152         "  border-width: 2;\n"
3153         "}\n"
3154         "\n"
3155         "GtkCalendar.highlight {\n"
3156         "  border-width: 0;\n"
3157         "}\n"
3158         "\n"
3159         "GtkCalendar.button {\n"
3160         "  background-color: @bg_color;\n"
3161         "}\n"
3162         "\n"
3163         "GtkCalendar.button:hover {\n"
3164         "  background-color: lighter (@bg_color);\n"
3165         "  color: @fg_color;\n"
3166         "}\n"
3167         "\n"
3168         ".menu * {\n"
3169         "  border-width: 0;\n"
3170         "  padding: 2;\n"
3171         "}\n"
3172         "\n";
3173
3174       provider = gtk_css_provider_new ();
3175       if (!gtk_css_provider_load_from_data (provider, str, -1, NULL))
3176         {
3177           g_error ("Failed to load the internal default CSS.");
3178         }
3179     }
3180
3181   return provider;
3182 }
3183
3184 gchar *
3185 _gtk_css_provider_get_theme_dir (void)
3186 {
3187   const gchar *var;
3188   gchar *path;
3189
3190   var = g_getenv ("GTK_DATA_PREFIX");
3191
3192   if (var)
3193     path = g_build_filename (var, "share", "themes", NULL);
3194   else
3195     path = g_build_filename (GTK_DATA_PREFIX, "share", "themes", NULL);
3196
3197   return path;
3198 }
3199
3200 /**
3201  * gtk_css_provider_get_named:
3202  * @name: A theme name
3203  * @variant: (allow-none): variant to load, for example, "dark", or
3204  *     %NULL for the default
3205  *
3206  * Loads a theme from the usual theme paths
3207  *
3208  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
3209  *     This memory is owned by GTK+, and you must not free it.
3210  */
3211 GtkCssProvider *
3212 gtk_css_provider_get_named (const gchar *name,
3213                             const gchar *variant)
3214 {
3215   static GHashTable *themes = NULL;
3216   GtkCssProvider *provider;
3217   gchar *key;
3218
3219   if (G_UNLIKELY (!themes))
3220     themes = g_hash_table_new (g_str_hash, g_str_equal);
3221
3222   if (variant == NULL)
3223     key = (gchar *)name;
3224   else
3225     key = g_strconcat (name, "-", variant, NULL);
3226
3227   provider = g_hash_table_lookup (themes, key);
3228
3229   if (!provider)
3230     {
3231       const gchar *home_dir;
3232       gchar *subpath, *path = NULL;
3233
3234       if (variant)
3235         subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
3236       else
3237         subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
3238
3239       /* First look in the users home directory
3240        */
3241       home_dir = g_get_home_dir ();
3242       if (home_dir)
3243         {
3244           path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
3245
3246           if (!g_file_test (path, G_FILE_TEST_EXISTS))
3247             {
3248               g_free (path);
3249               path = NULL;
3250             }
3251         }
3252
3253       if (!path)
3254         {
3255           gchar *theme_dir;
3256
3257           theme_dir = _gtk_css_provider_get_theme_dir ();
3258           path = g_build_filename (theme_dir, name, subpath, NULL);
3259           g_free (theme_dir);
3260
3261           if (!g_file_test (path, G_FILE_TEST_EXISTS))
3262             {
3263               g_free (path);
3264               path = NULL;
3265             }
3266         }
3267
3268       g_free (subpath);
3269
3270       if (path)
3271         {
3272           GError *error;
3273
3274           provider = gtk_css_provider_new ();
3275           error = NULL;
3276           if (!gtk_css_provider_load_from_path (provider, path, &error))
3277             {
3278               g_warning ("Could not load named theme \"%s\": %s", name, error->message);
3279               g_error_free (error);
3280
3281               g_object_unref (provider);
3282               provider = NULL;
3283             }
3284           else
3285             g_hash_table_insert (themes, g_strdup (key), provider);
3286
3287           g_free (path);
3288         }
3289     }
3290
3291   if (key != name)
3292     g_free (key);
3293
3294   return provider;
3295 }
3296
3297 static void
3298 selector_path_print (const SelectorPath *path,
3299                      GString *           str)
3300 {
3301   GSList *walk, *reverse;
3302
3303   reverse = g_slist_copy (path->elements);
3304   reverse = g_slist_reverse (reverse);
3305
3306   for (walk = reverse; walk; walk = walk->next)
3307     {
3308       SelectorElement *elem = walk->data;
3309
3310       switch (elem->elem_type)
3311         {
3312         case SELECTOR_TYPE_NAME:
3313         case SELECTOR_NAME:
3314           g_string_append (str, g_quark_to_string (elem->name));
3315           break;
3316         case SELECTOR_GTYPE:
3317           g_string_append (str, g_type_name (elem->type));
3318           break;
3319         case SELECTOR_REGION:
3320           g_string_append (str, g_quark_to_string (elem->region.name));
3321           if (elem->region.flags)
3322             {
3323               char * flag_names[] = {
3324                 "nth-child(even)",
3325                 "nth-child(odd)",
3326                 "first-child",
3327                 "last-child",
3328                 "sorted"
3329               };
3330               guint i;
3331
3332               for (i = 0; i < G_N_ELEMENTS (flag_names); i++)
3333                 {
3334                   if (elem->region.flags & (1 << i))
3335                     {
3336                       g_string_append_c (str, ':');
3337                       g_string_append (str, flag_names[i]);
3338                     }
3339                 }
3340             }
3341           break;
3342         case SELECTOR_CLASS:
3343           g_string_append_c (str, '.');
3344           g_string_append (str, g_quark_to_string (elem->name));
3345           break;
3346         case SELECTOR_GLOB:
3347           if (walk->next == NULL ||
3348               elem->combinator != COMBINATOR_CHILD ||
3349               ((SelectorElement *) walk->next->data)->elem_type != SELECTOR_CLASS)
3350             g_string_append (str, "*");
3351           break;
3352         default:
3353           g_assert_not_reached ();
3354         }
3355
3356       if (walk->next)
3357         {
3358           switch (elem->combinator)
3359             {
3360             case COMBINATOR_DESCENDANT:
3361               if (elem->elem_type != SELECTOR_CLASS ||
3362                   ((SelectorElement *) walk->next->data)->elem_type != SELECTOR_CLASS)
3363                 g_string_append_c (str, ' ');
3364               break;
3365             case COMBINATOR_CHILD:
3366               if (((SelectorElement *) walk->next->data)->elem_type != SELECTOR_CLASS)
3367                 g_string_append (str, " > ");
3368               break;
3369             default:
3370               g_assert_not_reached ();
3371             }
3372         }
3373
3374     }
3375
3376   if (path->state)
3377     {
3378       char * state_names[] = {
3379         "active",
3380         "hover",
3381         "selected",
3382         "insensitive",
3383         "inconsistent",
3384         "focus"
3385       };
3386       guint i;
3387
3388       for (i = 0; i < G_N_ELEMENTS (state_names); i++)
3389         {
3390           if (path->state & (1 << i))
3391             {
3392               g_string_append_c (str, ':');
3393               g_string_append (str, state_names[i]);
3394             }
3395         }
3396     }
3397
3398   g_slist_free (reverse);
3399 }
3400
3401 static void
3402 selector_style_info_print (const SelectorStyleInfo *info,
3403                            GString                 *str)
3404 {
3405   GList *keys, *walk;
3406   char *s;
3407
3408   selector_path_print (info->path, str);
3409
3410   g_string_append (str, " {\n");
3411
3412   keys = g_hash_table_get_keys (info->style);
3413   /* so the output is identical for identical selector styles */
3414   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3415
3416   for (walk = keys; walk; walk = walk->next)
3417     {
3418       const char *name = walk->data;
3419       const GValue *value = g_hash_table_lookup (info->style, (gpointer) name);
3420
3421       g_string_append (str, "  ");
3422       g_string_append (str, name);
3423       g_string_append (str, ": ");
3424       s = _gtk_css_value_to_string (value);
3425       g_string_append (str, s);
3426       g_free (s);
3427       g_string_append (str, ";\n");
3428     }
3429
3430   g_list_free (keys);
3431
3432   g_string_append (str, "}\n");
3433 }
3434
3435 static void
3436 gtk_css_provider_print_colors (GHashTable *colors,
3437                                GString    *str)
3438 {
3439   GList *keys, *walk;
3440   char *s;
3441
3442   keys = g_hash_table_get_keys (colors);
3443   /* so the output is identical for identical styles */
3444   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3445
3446   for (walk = keys; walk; walk = walk->next)
3447     {
3448       const char *name = walk->data;
3449       GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
3450
3451       g_string_append (str, "@define-color ");
3452       g_string_append (str, name);
3453       g_string_append (str, " ");
3454       s = gtk_symbolic_color_to_string (symbolic);
3455       g_string_append (str, s);
3456       g_free (s);
3457       g_string_append (str, ";\n");
3458     }
3459
3460   g_list_free (keys);
3461 }
3462
3463 /**
3464  * gtk_css_provider_to_string:
3465  * @provider: the provider to write to a string
3466  *
3467  * Convertes the @provider into a string representation in CSS
3468  * format.
3469  *
3470  * Using gtk_css_provider_load_from_data() with the return value
3471  * from this function on a new provider created with
3472  * gtk_css_provider_new() will basicallu create a duplicate of
3473  * this @provider.
3474  *
3475  * Returns: a new string representing the @provider.
3476  **/
3477 char *
3478 gtk_css_provider_to_string (GtkCssProvider *provider)
3479 {
3480   GtkCssProviderPrivate *priv;
3481   GString *str;
3482   guint i;
3483
3484   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
3485
3486   priv = provider->priv;
3487
3488   str = g_string_new ("");
3489
3490   gtk_css_provider_print_colors (priv->symbolic_colors, str);
3491
3492   for (i = 0; i < priv->selectors_info->len; i++)
3493     {
3494       if (i > 0)
3495         g_string_append (str, "\n");
3496       selector_style_info_print (g_ptr_array_index (priv->selectors_info, i),
3497                                  str);
3498     }
3499
3500   return g_string_free (str, FALSE);
3501 }
3502