Pileus Git - ~andy/gtk/blob - gtk/gtkcssprovider.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <string.h>
  23 #include <stdlib.h>
  24
  25 #include <gdk-pixbuf/gdk-pixbuf.h>
  26 #include <cairo-gobject.h>
  27
  28 #include "gtkcssproviderprivate.h"
  29
  30 #include "gtkcssparserprivate.h"
  31 #include "gtkcsssectionprivate.h"
  32 #include "gtkcssselectorprivate.h"
  33 #include "gtksymboliccolor.h"
  34 #include "gtkstyleprovider.h"
  35 #include "gtkstylecontextprivate.h"
  36 #include "gtkstylepropertiesprivate.h"
  37 #include "gtkstylepropertyprivate.h"
  38 #include "gtkbindings.h"
  39 #include "gtkmarshalers.h"
  40 #include "gtkprivate.h"
  41 #include "gtkintl.h"
  42
  43 /**
  44  * SECTION:gtkcssprovider
  45  * @Short_description: CSS-like styling for widgets
  46  * @Title: GtkCssProvider
  47  * @See_also: #GtkStyleContext, #GtkStyleProvider
  48  *
  49  * GtkCssProvider is an object implementing the #GtkStyleProvider interface.
  50  * It is able to parse <ulink url="http://www.w3.org/TR/CSS2">CSS</ulink>-like
  51  * input in order to style widgets.
  52  *
  53  * <refsect2 id="gtkcssprovider-files">
  54  * <title>Default files</title>
  55  * <para>
  56  * An application can cause GTK+ to parse a specific CSS style sheet by
  57  * calling gtk_css_provider_load_from_file() and adding the provider with
  58  * gtk_style_context_add_provider() or gtk_style_context_add_provider_for_screen().
  59  * In addition, certain files will be read when GTK+ is initialized. First,
  60  * the file <filename><envar>$XDG_CONFIG_HOME</envar>/gtk-3.0/gtk.css</filename>
  61  * is loaded if it exists. Then, GTK+ tries to load
  62  * <filename><envar>$HOME</envar>/.themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  63  * falling back to
  64  * <filename><replaceable>datadir</replaceable>/share/themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  65  * where <replaceable>theme-name</replaceable> is the name of the current theme
  66  * (see the #GtkSettings:gtk-theme-name setting) and <replaceable>datadir</replaceable>
  67  * is the prefix configured when GTK+ was compiled, unless overridden by the
  68  * <envar>GTK_DATA_PREFIX</envar> environment variable.
  69  * </para>
  70  * </refsect2>
  71  * <refsect2 id="gtkcssprovider-stylesheets">
  72  * <title>Style sheets</title>
  73  * <para>
  74  * The basic structure of the style sheets understood by this provider is
  75  * a series of statements, which are either rule sets or '@-rules', separated
  76  * by whitespace.
  77  * </para>
  78  * <para>
  79  * A rule set consists of a selector and a declaration block, which is
  80  * a series of declarations enclosed in curly braces ({ and }). The
  81  * declarations are separated by semicolons (;). Multiple selectors can
  82  * share the same declaration block, by putting all the separators in
  83  * front of the block, separated by commas.
  84  * </para>
  85  * <example><title>A rule set with two selectors</title>
  86  * <programlisting language="text">
  87  * GtkButton, GtkEntry {
  88  *     color: &num;ff00ea;
  89  *     font: Comic Sans 12
  90  * }
  91  * </programlisting>
  92  * </example>
  93  * </refsect2>
  94  * <refsect2 id="gtkcssprovider-selectors">
  95  * <title>Selectors</title>
  96  * <para>
  97  * Selectors work very similar to the way they do in CSS, with widget class
  98  * names taking the role of element names, and widget names taking the role
  99  * of IDs. When used in a selector, widget names must be prefixed with a
 100  * '&num;' character. The '*' character represents the so-called universal
 101  * selector, which matches any widget.
 102  * </para>
 103  * <para>
 104  * To express more complicated situations, selectors can be combined in
 105  * various ways:
 106  * <itemizedlist>
 107  * <listitem><para>To require that a widget satisfies several conditions,
 108  *   combine several selectors into one by concatenating them. E.g.
 109  *   <literal>GtkButton&num;button1</literal> matches a GtkButton widget
 110  *   with the name button1.</para></listitem>
 111  * <listitem><para>To only match a widget when it occurs inside some other
 112  *   widget, write the two selectors after each other, separated by whitespace.
 113  *   E.g. <literal>GtkToolBar GtkButton</literal> matches GtkButton widgets
 114  *   that occur inside a GtkToolBar.</para></listitem>
 115  * <listitem><para>In the previous example, the GtkButton is matched even
 116  *   if it occurs deeply nested inside the toolbar. To restrict the match
 117  *   to direct children of the parent widget, insert a '>' character between
 118  *   the two selectors. E.g. <literal>GtkNotebook > GtkLabel</literal> matches
 119  *   GtkLabel widgets that are direct children of a GtkNotebook.</para></listitem>
 120  * </itemizedlist>
 121  * </para>
 122  * <example>
 123  * <title>Widget classes and names in selectors</title>
 124  * <programlisting language="text">
 125  * /&ast; Theme labels that are descendants of a window &ast;/
 126  * GtkWindow GtkLabel {
 127  *     background-color: &num;898989
 128  * }
 129  *
 130  * /&ast; Theme notebooks, and anything that's within these &ast;/
 131  * GtkNotebook {
 132  *     background-color: &num;a939f0
 133  * }
 134  *
 135  * /&ast; Theme combo boxes, and entries that
 136  *  are direct children of a notebook &ast;/
 137  * GtkComboBox,
 138  * GtkNotebook > GtkEntry {
 139  *     color: @fg_color;
 140  *     background-color: &num;1209a2
 141  * }
 142  *
 143  * /&ast; Theme any widget within a GtkBin &ast;/
 144  * GtkBin * {
 145  *     font: Sans 20
 146  * }
 147  *
 148  * /&ast; Theme a label named title-label &ast;/
 149  * GtkLabel&num;title-label {
 150  *     font: Sans 15
 151  * }
 152  *
 153  * /&ast; Theme any widget named main-entry &ast;/
 154  * &num;main-entry {
 155  *     background-color: &num;f0a810
 156  * }
 157  * </programlisting>
 158  * </example>
 159  * <para>
 160  * Widgets may also define style classes, which can be used for matching.
 161  * When used in a selector, style classes must be prefixed with a '.'
 162  * character.
 163  * </para>
 164  * <para>
 165  * Refer to the documentation of individual widgets to learn which
 166  * style classes they define and see <xref linkend="gtkstylecontext-classes"/>
 167  * for a list of all style classes used by GTK+ widgets.
 168  * </para>
 169  * <para>
 170  * Note that there is some ambiguity in the selector syntax when it comes
 171  * to differentiation widget class names from regions. GTK+ currently treats
 172  * a string as a widget class name if it contains any uppercase characters
 173  * (which should work for more widgets with names like GtkLabel).
 174  * </para>
 175  * <example>
 176  * <title>Style classes in selectors</title>
 177  * <programlisting language="text">
 178  * /&ast; Theme all widgets defining the class entry &ast;/
 179  * .entry {
 180  *     color: &num;39f1f9;
 181  * }
 182  *
 183  * /&ast; Theme spinbuttons' entry &ast;/
 184  * GtkSpinButton.entry {
 185  *     color: &num;900185
 186  * }
 187  * </programlisting>
 188  * </example>
 189  * <para>
 190  * In complicated widgets like e.g. a GtkNotebook, it may be desirable
 191  * to style different parts of the widget differently. To make this
 192  * possible, container widgets may define regions, whose names
 193  * may be used for matching in selectors.
 194  * </para>
 195  * <para>
 196  * Some containers allow to further differentiate between regions by
 197  * applying so-called pseudo-classes to the region. For example, the
 198  * tab region in GtkNotebook allows to single out the first or last
 199  * tab by using the :first-child or :last-child pseudo-class.
 200  * When used in selectors, pseudo-classes must be prefixed with a
 201  * ':' character.
 202  * </para>
 203  * <para>
 204  * Refer to the documentation of individual widgets to learn which
 205  * regions and pseudo-classes they define and see
 206  * <xref linkend="gtkstylecontext-classes"/> for a list of all regions
 207  * used by GTK+ widgets.
 208  * </para>
 209  * <example>
 210  * <title>Regions in selectors</title>
 211  * <programlisting language="text">
 212  * /&ast; Theme any label within a notebook &ast;/
 213  * GtkNotebook GtkLabel {
 214  *     color: &num;f90192;
 215  * }
 216  *
 217  * /&ast; Theme labels within notebook tabs &ast;/
 218  * GtkNotebook tab GtkLabel {
 219  *     color: &num;703910;
 220  * }
 221  *
 222  * /&ast; Theme labels in the any first notebook
 223  *  tab, both selectors are equivalent &ast;/
 224  * GtkNotebook tab:nth-child(first) GtkLabel,
 225  * GtkNotebook tab:first-child GtkLabel {
 226  *     color: &num;89d012;
 227  * }
 228  * </programlisting>
 229  * </example>
 230  * <para>
 231  * Another use of pseudo-classes is to match widgets depending on their
 232  * state. This is conceptually similar to the :hover, :active or :focus
 233  * pseudo-classes in CSS. The available pseudo-classes for widget states
 234  * are :active, :prelight (or :hover), :insensitive, :selected, :focused
 235  * and :inconsistent.
 236  * </para>
 237  * <example>
 238  * <title>Styling specific widget states</title>
 239  * <programlisting language="text">
 240  * /&ast; Theme active (pressed) buttons &ast;/
 241  * GtkButton:active {
 242  *     background-color: &num;0274d9;
 243  * }
 244  *
 245  * /&ast; Theme buttons with the mouse pointer on it,
 246  *    both are equivalent &ast;/
 247  * GtkButton:hover,
 248  * GtkButton:prelight {
 249  *     background-color: &num;3085a9;
 250  * }
 251  *
 252  * /&ast; Theme insensitive widgets, both are equivalent &ast;/
 253  * :insensitive,
 254  * *:insensitive {
 255  *     background-color: &num;320a91;
 256  * }
 257  *
 258  * /&ast; Theme selection colors in entries &ast;/
 259  * GtkEntry:selected {
 260  *     background-color: &num;56f9a0;
 261  * }
 262  *
 263  * /&ast; Theme focused labels &ast;/
 264  * GtkLabel:focused {
 265  *     background-color: &num;b4940f;
 266  * }
 267  *
 268  * /&ast; Theme inconsistent checkbuttons &ast;/
 269  * GtkCheckButton:inconsistent {
 270  *     background-color: &num;20395a;
 271  * }
 272  * </programlisting>
 273  * </example>
 274  * <para>
 275  * Widget state pseudoclasses may only apply to the last element
 276  * in a selector.
 277  * </para>
 278  * <para>
 279  * To determine the effective style for a widget, all the matching rule
 280  * sets are merged. As in CSS, rules apply by specificity, so the rules
 281  * whose selectors more closely match a widget path will take precedence
 282  * over the others.
 283  * </para>
 284  * </refsect2>
 285  * <refsect2 id="gtkcssprovider-rules">
 286  * <title>&commat; Rules</title>
 287  * <para>
 288  * GTK+'s CSS supports the &commat;import rule, in order to load another
 289  * CSS style sheet in addition to the currently parsed one.
 290  * </para>
 291  * <example>
 292  * <title>Using the &commat;import rule</title>
 293  * <programlisting language="text">
 294  * &commat;import url ("path/to/common.css");
 295  * </programlisting>
 296  * </example>
 297  * <para id="css-binding-set">
 298  * In order to extend key bindings affecting different widgets, GTK+
 299  * supports the &commat;binding-set rule to parse a set of bind/unbind
 300  * directives, see #GtkBindingSet for the supported syntax. Note that
 301  * the binding sets defined in this way must be associated with rule sets
 302  * by setting the gtk-key-bindings style property.
 303  * </para>
 304  * <para>
 305  * Customized key bindings are typically defined in a separate
 306  * <filename>gtk-keys.css</filename> CSS file and GTK+ loads this file
 307  * according to the current key theme, which is defined by the
 308  * #GtkSettings:gtk-key-theme-name setting.
 309  * </para>
 310  * <example>
 311  * <title>Using the &commat;binding rule</title>
 312  * <programlisting language="text">
 313  * &commat;binding-set binding-set1 {
 314  *   bind "&lt;alt&gt;Left" { "move-cursor" (visual-positions, -3, 0) };
 315  *   unbind "End";
 316  * };
 317  *
 318  * &commat;binding-set binding-set2 {
 319  *   bind "&lt;alt&gt;Right" { "move-cursor" (visual-positions, 3, 0) };
 320  *   bind "&lt;alt&gt;KP_space" { "delete-from-cursor" (whitespace, 1)
 321  *                          "insert-at-cursor" (" ") };
 322  * };
 323  *
 324  * GtkEntry {
 325  *   gtk-key-bindings: binding-set1, binding-set2;
 326  * }
 327  * </programlisting>
 328  * </example>
 329  * <para>
 330  * GTK+ also supports an additional &commat;define-color rule, in order
 331  * to define a color name which may be used instead of color numeric
 332  * representations. Also see the #GtkSettings:gtk-color-scheme setting
 333  * for a way to override the values of these named colors.
 334  * </para>
 335  * <example>
 336  * <title>Defining colors</title>
 337  * <programlisting language="text">
 338  * &commat;define-color bg_color &num;f9a039;
 339  *
 340  * &ast; {
 341  *     background-color: &commat;bg_color;
 342  * }
 343  * </programlisting>
 344  * </example>
 345  * </refsect2>
 346  * <refsect2 id="gtkcssprovider-symbolic-colors">
 347  * <title>Symbolic colors</title>
 348  * <para>
 349  * Besides being able to define color names, the CSS parser is also able
 350  * to read different color expressions, which can also be nested, providing
 351  * a rich language to define colors which are derived from a set of base
 352  * colors.
 353  * </para>
 354  * <example>
 355  * <title>Using symbolic colors</title>
 356  * <programlisting language="text">
 357  * &commat;define-color entry-color shade (&commat;bg_color, 0.7);
 358  *
 359  * GtkEntry {
 360  *     background-color: @entry-color;
 361  * }
 362  *
 363  * GtkEntry:focused {
 364  *     background-color: mix (&commat;entry-color,
 365  *                            shade (&num;fff, 0.5),
 366  *                            0.8);
 367  * }
 368  * </programlisting>
 369  * </example>
 370  * <para>
 371  *   The various ways to express colors in GTK+ CSS are:
 372  * </para>
 373  * <informaltable>
 374  *   <tgroup cols="3">
 375  *     <thead>
 376  *       <row>
 377  *         <entry>Syntax</entry>
 378  *         <entry>Explanation</entry>
 379  *         <entry>Examples</entry>
 380  *       </row>
 381  *     </thead>
 382  *     <tbody>
 383  *       <row>
 384  *         <entry>rgb(@r, @g, @b)</entry>
 385  *         <entry>An opaque color; @r, @g, @b can be either integers between
 386  *                0 and 255 or percentages</entry>
 387  *         <entry><literallayout>rgb(128, 10, 54)
 388  * rgb(20%, 30%, 0%)</literallayout></entry>
 389  *       </row>
 390  *       <row>
 391  *         <entry>rgba(@r, @g, @b, @a)</entry>
 392  *         <entry>A translucent color; @r, @g, @b are as in the previous row,
 393  *                @a is a floating point number between 0 and 1</entry>
 394  *         <entry><literallayout>rgba(255, 255, 0, 0.5)</literallayout></entry>
 395  *       </row>
 396  *       <row>
 397  *         <entry>&num;@xxyyzz</entry>
 398  *         <entry>An opaque color; @xx, @yy, @zz are hexadecimal numbers
 399  *                specifying @r, @g, @b variants with between 1 and 4
 400  *                hexadecimal digits per component are allowed</entry>
 401  *         <entry><literallayout>&num;ff12ab
 402  * &num;f0c</literallayout></entry>
 403  *       </row>
 404  *       <row>
 405  *         <entry>&commat;name</entry>
 406  *         <entry>Reference to a color that has been defined with
 407  *                &commat;define-color
 408  *         </entry>
 409  *         <entry>&commat;bg_color</entry>
 410  *       </row>
 411  *       <row>
 412  *         <entry>mix(@color1, @color2, @f)</entry>
 413  *         <entry>A linear combination of @color1 and @color2. @f is a
 414  *                floating point number between 0 and 1.</entry>
 415  *         <entry><literallayout>mix(&num;ff1e0a, &commat;bg_color, 0.8)</literallayout></entry>
 416  *       </row>
 417  *       <row>
 418  *         <entry>shade(@color, @f)</entry>
 419  *         <entry>A lighter or darker variant of @color. @f is a
 420  *                floating point number.
 421  *         </entry>
 422  *         <entry>shade(&commat;fg_color, 0.5)</entry>
 423  *       </row>
 424  *       <row>
 425  *         <entry>lighter(@color)</entry>
 426  *         <entry>A lighter variant of @color</entry>
 427  *       </row>
 428  *       <row>
 429  *         <entry>darker(@color)</entry>
 430  *         <entry>A darker variant of @color</entry>
 431  *       </row>
 432  *     </tbody>
 433  *   </tgroup>
 434  * </informaltable>
 435  * </refsect2>
 436  * <refsect2 id="gtkcssprovider-gradients">
 437  * <title>Gradients</title>
 438  * <para>
 439  * Linear or radial Gradients can be used as background images.
 440  * </para>
 441  * <para>
 442  * A linear gradient along the line from (@start_x, @start_y) to
 443  * (@end_x, @end_y) is specified using the syntax
 444  * <literallayout>-gtk-gradient (linear,
 445  *               @start_x @start_y, @end_x @end_y,
 446  *               color-stop (@position, @color),
 447  *               ...)</literallayout>
 448  * where @start_x and @end_x can be either a floating point number between
 449  * 0 and 1 or one of the special values 'left', 'right' or 'center', @start_y
 450  * and @end_y can be either a floating point number between 0 and 1 or one
 451  * of the special values 'top', 'bottom' or 'center', @position is a floating
 452  * point number between 0 and 1 and @color is a color expression (see above).
 453  * The color-stop can be repeated multiple times to add more than one color
 454  * stop. 'from (@color)' and 'to (@color)' can be used as abbreviations for
 455  * color stops with position 0 and 1, respectively.
 456  * </para>
 457  * <example>
 458  * <title>A linear gradient</title>
 459  * <inlinegraphic fileref="gradient1.png" format="PNG"/>
 460  * <para>This gradient was specified with
 461  * <literallayout>-gtk-gradient (linear,
 462  *                left top, right bottom,
 463  *                from(&commat;yellow), to(&commat;blue))</literallayout></para>
 464  * </example>
 465  * <example>
 466  * <title>Another linear gradient</title>
 467  * <inlinegraphic fileref="gradient2.png" format="PNG"/>
 468  * <para>This gradient was specified with
 469  * <literallayout>-gtk-gradient (linear,
 470  *                0 0, 0 1,
 471  *                color-stop(0, &commat;yellow),
 472  *                color-stop(0.2, &commat;blue),
 473  *                color-stop(1, &num;0f0))</literallayout></para>
 474  * </example>
 475  * <para>
 476  * A radial gradient along the two circles defined by (@start_x, @start_y,
 477  * @start_radius) and (@end_x, @end_y, @end_radius) is specified using the
 478  * syntax
 479  * <literallayout>-gtk-gradient (radial,
 480  *                @start_x @start_y, @start_radius,
 481  *                @end_x @end_y, @end_radius,
 482  *                color-stop (@position, @color),
 483  *                ...)</literallayout>
 484  * where @start_radius and @end_radius are floating point numbers and
 485  * the other parameters are as before.
 486  * </para>
 487  * <example>
 488  * <title>A radial gradient</title>
 489  * <inlinegraphic fileref="gradient3.png" format="PNG"/>
 490  * <para>This gradient was specified with
 491  * <literallayout>-gtk-gradient (radial,
 492  *                center center, 0,
 493  *                center center, 1,
 494  *                from(&commat;yellow), to(&commat;green))</literallayout></para>
 495  * </example>
 496  * <example>
 497  * <title>Another radial gradient</title>
 498  * <inlinegraphic fileref="gradient4.png" format="PNG"/>
 499  * <para>This gradient was specified with
 500  * <literallayout>-gtk-gradient (radial,
 501  *                0.4 0.4, 0.1,
 502  *                0.6 0.6, 0.7,
 503  *                color-stop (0, &num;f00),
 504  *                color-stop (0.1, &num;a0f),
 505  *                color-stop (0.2, &commat;yellow),
 506  *                color-stop (1, &commat;green))</literallayout></para>
 507  * </example>
 508  * </refsect2>
 509  * <refsect2 id="gtkcssprovider-shadows">
 510  * <title>Text shadow</title>
 511  * <para>
 512  * A shadow list can be applied to text or symbolic icons, using the CSS3
 513  * text-shadow syntax, as defined in
 514  * <ulink url="http://www.w3.org/TR/css3-text/#text-shadow">the CSS3 specification</ulink>.
 515  * </para>
 516  * <para>
 517  * A text shadow is specified using the syntax
 518  * <literallayout>text-shadow: @horizontal_offset @vertical_offset [ @blur_radius ] @color</literallayout>
 519  * The offset of the shadow is specified with the @horizontal_offset and @vertical_offset
 520  * parameters. The optional blur radius is parsed, but it is currently not rendered by
 521  * the GTK+ theming engine.
 522  * </para>
 523  * <para>
 524  * To set multiple shadows on an element, you can specify a comma-separated list
 525  * of shadow elements in the text-shadow property. Shadows are always rendered
 526  * front-back, i.e. the first shadow specified is on top of the others. Shadows
 527  * can thus overlay each other, but they can never overlay the text itself,
 528  * which is always rendered on top of the shadow layer.
 529  * </para>
 530  * </refsect2>
 531  * <refsect2>
 532  * <title>Box shadow</title>
 533  * <para>
 534  * Themes can apply shadows on framed elements using the CSS3 box-shadow syntax,
 535  * as defined in
 536  * <ulink url="http://www.w3.org/TR/css3-background/#the-box-shadow">the CSS3 specification</ulink>.
 537  * </para>
 538  * <para>
 539  * A box shadow is specified using the syntax
 540  * <literallayout>box-shadow: [ @inset ] @horizontal_offset @vertical_offset [ @blur_radius ] [ @spread ] @color</literallayout>
 541  * A positive offset will draw a shadow that is offset to the right (down) of the box,
 542  * a negative offset to the left (top). The optional spread parameter defines an additional
 543  * distance to expand the shadow shape in all directions, by the specified radius.
 544  * The optional blur radius parameter is parsed, but it is currently not rendered by
 545  * the GTK+ theming engine.
 546  * The inset parameter defines whether the drop shadow should be rendered inside or outside
 547  * the box canvas. Only inset box-shadows are currently supported by the GTK+ theming engine,
 548  * non-inset elements are currently ignored.
 549  * </para>
 550  * <para>
 551  * To set multiple box-shadows on an element, you can specify a comma-separated list
 552  * of shadow elements in the box-shadow property. Shadows are always rendered
 553  * front-back, i.e. the first shadow specified is on top of the others, so they may
 554  * overlap other boxes or other shadows.
 555  * </para>
 556  * </refsect2>
 557  * <refsect2 id="gtkcssprovider-border-image">
 558  * <title>Border images</title>
 559  * <para>
 560  * Images and gradients can also be used in slices for the purpose of creating
 561  * scalable borders.
 562  * For more information, see the CSS3 documentation for the border-image property,
 563  * which can be found <ulink url="http://www.w3.org/TR/css3-background/#border-images">here</ulink>.
 564  * </para>
 565  * <inlinegraphic fileref="slices.png" format="PNG"/>
 566  * <para>
 567  * The parameters of the slicing process are controlled by
 568  * four separate properties. Note that you can use the
 569  * <literallayout>border-image</literallayout> shorthand property
 570  * to set values for the three properties at the same time.
 571  * </para>
 572  * <para>
 573  * <literallayout>border-image-source: url(@path)
 574  * (or border-image-source: -gtk-gradient(...))</literallayout>:
 575  * Specifies the source of the border image, and it can either
 576  * be an URL or a gradient (see above).
 577  * </para>
 578  * <para>
 579  * <literallayout>border-image-slice: @top @right @bottom @left</literallayout>
 580  * The sizes specified by the @top, @right, @bottom and @left parameters
 581  * are the offsets, in pixels, from the relevant edge where the image
 582  * should be "cut off" to build the slices used for the rendering
 583  * of the border.
 584  * </para>
 585  * <para>
 586  * <literallayout>border-image-width: @top @right @bottom @left</literallayout>
 587  * The sizes specified by the @top, @right, @bottom and @left parameters
 588  * are inward distances from the border box edge, used to specify the
 589  * rendered size of each slice determined by border-image-slice.
 590  * If this property is not specified, the values of border-width will
 591  * be used as a fallback.
 592  * </para>
 593  * <para>
 594  * <literallayout>border-image-repeat: [stretch|repeat|round|space] ?
 595  * [stretch|repeat|round|space]</literallayout>
 596  * Specifies how the image slices should be rendered in the area
 597  * outlined by border-width.
 598  * The default (stretch) is to resize the slice to fill in the whole
 599  * allocated area.
 600  * If the value of this property is 'repeat', the image slice
 601  * will be tiled to fill the area.
 602  * If the value of this property is 'round', the image slice will
 603  * be tiled to fill the area, and scaled to fit it exactly
 604  * a whole number of times.
 605  * If the value of this property is 'space', the image slice will
 606  * be tiled to fill the area, and if it doesn't fit it exactly a whole
 607  * number of times, the extra space is distributed as padding around
 608  * the slices.
 609  * If two options are specified, the first one affects
 610  * the horizontal behaviour and the second one the vertical behaviour.
 611  * If only one option is specified, it affects both.
 612  * </para>
 613  * <example>
 614  * <title>A border image</title>
 615  * <inlinegraphic fileref="border1.png" format="PNG"/>
 616  * <para>This border image was specified with
 617  * <literallayout>url("gradient1.png") 10 10 10 10</literallayout>
 618  * </para>
 619  * </example>
 620  * <example>
 621  * <title>A repeating border image</title>
 622  * <inlinegraphic fileref="border2.png" format="PNG"/>
 623  * <para>This border image was specified with
 624  * <literallayout>url("gradient1.png") 10 10 10 10 repeat</literallayout>
 625  * </para>
 626  * </example>
 627  * <example>
 628  * <title>A stretched border image</title>
 629  * <inlinegraphic fileref="border3.png" format="PNG"/>
 630  * <para>This border image was specified with
 631  * <literallayout>url("gradient1.png") 10 10 10 10 stretch</literallayout>
 632  * </para>
 633  * </example>
 634  * </refsect2>
 635  * <refsect2 id="gtkcssprovider-transitions">
 636  * <para>Styles can specify transitions that will be used to create a gradual
 637  * change in the appearance when a widget state changes. The following
 638  * syntax is used to specify transitions:
 639  * <literallayout>@duration [s|ms] [linear|ease|ease-in|ease-out|ease-in-out] [loop]?</literallayout>
 640  * The @duration is the amount of time that the animation will take for
 641  * a complete cycle from start to end. If the loop option is given, the
 642  * animation will be repated until the state changes again.
 643  * The option after the duration determines the transition function from a
 644  * small set of predefined functions.
 645  * <figure><title>Linear transition</title>
 646  * <graphic fileref="linear.png" format="PNG"/>
 647  * </figure>
 648  * <figure><title>Ease transition</title>
 649  * <graphic fileref="ease.png" format="PNG"/>
 650  * </figure>
 651  * <figure><title>Ease-in-out transition</title>
 652  * <graphic fileref="ease-in-out.png" format="PNG"/>
 653  * </figure>
 654  * <figure><title>Ease-in transition</title>
 655  * <graphic fileref="ease-in.png" format="PNG"/>
 656  * </figure>
 657  * <figure><title>Ease-out transition</title>
 658  * <graphic fileref="ease-out.png" format="PNG"/>
 659  * </figure>
 660  * </para>
 661  * </refsect2>
 662  * <refsect2 id="gtkcssprovider-properties">
 663  * <title>Supported properties</title>
 664  * <para>
 665  * Properties are the part that differ the most to common CSS,
 666  * not all properties are supported (some are planned to be
 667  * supported eventually, some others are meaningless or don't
 668  * map intuitively in a widget based environment).
 669  * </para>
 670  * <para>
 671  * The currently supported properties are:
 672  * </para>
 673  * <informaltable>
 674  *   <tgroup cols="4">
 675  *     <thead>
 676  *       <row>
 677  *         <entry>Property name</entry>
 678  *         <entry>Syntax</entry>
 679  *         <entry>Maps to</entry>
 680  *         <entry>Examples</entry>
 681  *       </row>
 682  *     </thead>
 683  *     <tbody>
 684  *       <row>
 685  *         <entry>engine</entry>
 686  *         <entry>engine-name</entry>
 687  *         <entry>#GtkThemingEngine</entry>
 688  *         <entry>engine: clearlooks;
 689  *  engine: none; /&ast; use the default (i.e. builtin) engine) &ast;/ </entry>
 690  *       </row>
 691  *       <row>
 692  *         <entry>background-color</entry>
 693  *         <entry morerows="2">color (see above)</entry>
 694  *         <entry morerows="7">#GdkRGBA</entry>
 695  *         <entry morerows="7"><literallayout>background-color: &num;fff;
 696  * color: &amp;color1;
 697  * background-color: shade (&amp;color1, 0.5);
 698  * color: mix (&amp;color1, &num;f0f, 0.8);</literallayout>
 699  *         </entry>
 700  *       </row>
 701  *       <row>
 702  *         <entry>color</entry>
 703  *       </row>
 704  *       <row>
 705  *         <entry>border-top-color</entry>
 706  *         <entry morerows="4">transparent|color (see above)</entry>
 707  *       </row>
 708  *       <row>
 709  *         <entry>border-right-color</entry>
 710  *       </row>
 711  *       <row>
 712  *         <entry>border-bottom-color</entry>
 713  *       </row>
 714  *       <row>
 715  *         <entry>border-left-color</entry>
 716  *       </row>
 717  *       <row>
 718  *         <entry>border-color</entry>
 719  *         <entry>[transparent|color]{1,4}</entry>
 720  *       </row>
 721  *       <row>
 722  *         <entry>font-family</entry>
 723  *         <entry>@family [, @family]*</entry>
 724  *         <entry>#gchararray</entry>
 725  *         <entry>font-family: Sans, Arial;</entry>
 726  *       </row>
 727  *       <row>
 728  *         <entry>font-style</entry>
 729  *         <entry>[normal|oblique|italic]</entry>
 730  *         <entry>#PANGO_TYPE_STYLE</entry>
 731  *         <entry>font-style: italic;</entry>
 732  *       </row>
 733  *       <row>
 734  *         <entry>font-variant</entry>
 735  *         <entry>[normal|small-caps]</entry>
 736  *         <entry>#PANGO_TYPE_VARIANT</entry>
 737  *         <entry>font-variant: normal;</entry>
 738  *       </row>
 739  *       <row>
 740  *         <entry>font-weight</entry>
 741  *         <entry>[normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900]</entry>
 742  *         <entry>#PANGO_TYPE_WEIGHT</entry>
 743  *         <entry>font-weight: bold;</entry>
 744  *       </row>
 745  *       <row>
 746  *         <entry>font-size</entry>
 747  *         <entry>Font size in point</entry>
 748  *         <entry>#gint</entry>
 749  *         <entry>font-size: 13;</entry>
 750  *       </row>
 751  *       <row>
 752  *         <entry>font</entry>
 753  *         <entry>@family [@style] [@size]</entry>
 754  *         <entry>#PangoFontDescription</entry>
 755  *         <entry>font: Sans 15;</entry>
 756  *       </row>
 757  *       <row>
 758  *         <entry>margin-top</entry>
 759  *         <entry>integer</entry>
 760  *         <entry>#gint</entry>
 761  *         <entry>margin-top: 0;</entry>
 762  *       </row>
 763  *       <row>
 764  *         <entry>margin-left</entry>
 765  *         <entry>integer</entry>
 766  *         <entry>#gint</entry>
 767  *         <entry>margin-left: 1;</entry>
 768  *       </row>
 769  *       <row>
 770  *         <entry>margin-bottom</entry>
 771  *         <entry>integer</entry>
 772  *         <entry>#gint</entry>
 773  *         <entry>margin-bottom: 2;</entry>
 774  *       </row>
 775  *       <row>
 776  *         <entry>margin-right</entry>
 777  *         <entry>integer</entry>
 778  *         <entry>#gint</entry>
 779  *         <entry>margin-right: 4;</entry>
 780  *       </row>
 781  *       <row>
 782  *         <entry>margin</entry>
 783  *         <entry morerows="1"><literallayout>@width
 784  * @vertical_width @horizontal_width
 785  * @top_width @horizontal_width @bottom_width
 786  * @top_width @right_width @bottom_width @left_width</literallayout>
 787  *         </entry>
 788  *         <entry morerows="1">#GtkBorder</entry>
 789  *         <entry morerows="1"><literallayout>margin: 5;
 790  * margin: 5 10;
 791  * margin: 5 10 3;
 792  * margin: 5 10 3 5;</literallayout>
 793  *         </entry>
 794  *       </row>
 795  *       <row>
 796  *         <entry>padding-top</entry>
 797  *         <entry>integer</entry>
 798  *         <entry>#gint</entry>
 799  *         <entry>padding-top: 5;</entry>
 800  *       </row>
 801  *       <row>
 802  *         <entry>padding-left</entry>
 803  *         <entry>integer</entry>
 804  *         <entry>#gint</entry>
 805  *         <entry>padding-left: 5;</entry>
 806  *       </row>
 807  *       <row>
 808  *         <entry>padding-bottom</entry>
 809  *         <entry>integer</entry>
 810  *         <entry>#gint</entry>
 811  *         <entry>padding-bottom: 5;</entry>
 812  *       </row>
 813  *       <row>
 814  *         <entry>padding-right</entry>
 815  *         <entry>integer</entry>
 816  *         <entry>#gint</entry>
 817  *         <entry>padding-right: 5;</entry>
 818  *       </row>
 819  *       <row>
 820  *         <entry>padding</entry>
 821  *       </row>
 822  *       <row>
 823  *         <entry>background-image</entry>
 824  *         <entry><literallayout>gradient (see above) or
 825  * url(@path)</literallayout></entry>
 826  *         <entry>#cairo_pattern_t</entry>
 827  *         <entry><literallayout>-gtk-gradient (linear,
 828  *                left top, right top,
 829  *                from (&num;fff), to (&num;000));
 830  * -gtk-gradient (linear, 0.0 0.5, 0.5 1.0,
 831  *                from (&num;fff),
 832  *                color-stop (0.5, &num;f00),
 833  *                to (&num;000));
 834  * -gtk-gradient (radial,
 835  *                center center, 0.2,
 836  *                center center, 0.8,
 837  *                color-stop (0.0, &num;fff),
 838  *                color-stop (1.0, &num;000));
 839  * url ('background.png');</literallayout>
 840  *         </entry>
 841  *       </row>
 842  *       <row>
 843  *         <entry>border-top-width</entry>
 844  *         <entry>integer</entry>
 845  *         <entry>#gint</entry>
 846  *         <entry>border-top-width: 5;</entry>
 847  *       </row>
 848  *       <row>
 849  *         <entry>border-left-width</entry>
 850  *         <entry>integer</entry>
 851  *         <entry>#gint</entry>
 852  *         <entry>border-left-width: 5;</entry>
 853  *       </row>
 854  *       <row>
 855  *         <entry>border-bottom-width</entry>
 856  *         <entry>integer</entry>
 857  *         <entry>#gint</entry>
 858  *         <entry>border-bottom-width: 5;</entry>
 859  *       </row>
 860  *       <row>
 861  *         <entry>border-right-width</entry>
 862  *         <entry>integer</entry>
 863  *         <entry>#gint</entry>
 864  *         <entry>border-right-width: 5;</entry>
 865  *       </row>
 866  *       <row>
 867  *         <entry>border-width</entry>
 868  *         <entry morerows="1">#GtkBorder</entry>
 869  *         <entry morerows="1"><literallayout>border-width: 1;
 870  * border-width: 1 2;
 871  * border-width: 1 2 3;
 872  * border-width: 1 2 3 5;</literallayout>
 873  *         </entry>
 874  *       </row>
 875  *       <row>
 876  *         <entry>border-radius</entry>
 877  *         <entry>integer</entry>
 878  *         <entry>#gint</entry>
 879  *         <entry>border-radius: 5;</entry>
 880  *       </row>
 881  *       <row>
 882  *         <entry>border-style</entry>
 883  *         <entry>[none|solid|inset|outset]</entry>
 884  *         <entry>#GtkBorderStyle</entry>
 885  *         <entry>border-style: solid;</entry>
 886  *       </row>
 887  *       <row>
 888  *         <entry>border-image</entry>
 889  *         <entry><literallayout>border image (see above)</literallayout></entry>
 890  *         <entry>internal use only</entry>
 891  *         <entry><literallayout>border-image: url("/path/to/image.png") 3 4 3 4 stretch;
 892  * border-image: url("/path/to/image.png") 3 4 4 3 repeat stretch;</literallayout>
 893  *         </entry>
 894  *       </row>
 895  *       <row>
 896  *         <entry>text-shadow</entry>
 897  *         <entry>shadow list (see above)</entry>
 898  *         <entry>#GtkTextShadow</entry>
 899  *         <entry><literallayout>text-shadow: 1 1 0 blue, -4 -4 red;</literallayout></entry>
 900  *       </row>
 901  *       <row>
 902  *         <entry>transition</entry>
 903  *         <entry>transition (see above)</entry>
 904  *         <entry>internal use only</entry>
 905  *         <entry><literallayout>transition: 150ms ease-in-out;
 906  * transition: 1s linear loop;</literallayout>
 907  *         </entry>
 908  *       </row>
 909  *       <row>
 910  *         <entry>gtk-key-bindings</entry>
 911  *         <entry>binding set name list</entry>
 912  *         <entry>internal use only</entry>
 913  *         <entry><literallayout>gtk-bindings: binding1, binding2, ...;</literallayout>
 914  *         </entry>
 915  *       </row>
 916  *     </tbody>
 917  *   </tgroup>
 918  * </informaltable>
 919  * <para>
 920  * GtkThemingEngines can register their own, engine-specific style properties
 921  * with the function gtk_theming_engine_register_property(). These properties
 922  * can be set in CSS like other properties, using a name of the form
 923  * <literallayout>-<replaceable>namespace</replaceable>-<replaceable>name</replaceable></literallayout>, where <replaceable>namespace</replaceable> is typically
 924  * the name of the theming engine, and <replaceable>name</replaceable> is the
 925  * name of the property. Style properties that have been registered by widgets
 926  * using gtk_widget_class_install_style_property() can also be set in this
 927  * way, using the widget class name for <replaceable>namespace</replaceable>.
 928  * </para>
 929  * <example>
 930  * <title>Using engine-specific style properties</title>
 931  * <programlisting>
 932  * * {
 933  *     engine: clearlooks;
 934  *     border-radius: 4;
 935  *     -GtkPaned-handle-size: 6;
 936  *     -clearlooks-colorize-scrollbar: false;
 937  * }
 938  * </programlisting>
 939  * </example>
 940  * </refsect2>
 941  */
 942
 943 typedef struct GtkCssRuleset GtkCssRuleset;
 944 typedef struct _GtkCssScanner GtkCssScanner;
 945 typedef enum ParserScope ParserScope;
 946 typedef enum ParserSymbol ParserSymbol;
 947
 948 struct GtkCssRuleset
 949 {
 950   GtkCssSelector *selector;
 951   GHashTable *widget_style;
 952   GHashTable *style;
 953
 954   guint has_inherit :1;
 955 };
 956
 957 struct _GtkCssScanner
 958 {
 959   GtkCssProvider *provider;
 960   GtkCssParser *parser;
 961   GtkCssSection *section;
 962   GtkCssScanner *parent;
 963   GFile *file;
 964   GFile *base;
 965   GSList *state;
 966 };
 967
 968 struct _GtkCssProviderPrivate
 969 {
 970   GScanner *scanner;
 971
 972   GHashTable *symbolic_colors;
 973
 974   GArray *rulesets;
 975 };
 976
 977 enum ParserScope {
 978   SCOPE_SELECTOR,
 979   SCOPE_PSEUDO_CLASS,
 980   SCOPE_NTH_CHILD,
 981   SCOPE_DECLARATION,
 982   SCOPE_VALUE,
 983   SCOPE_BINDING_SET
 984 };
 985
 986 /* Extend GtkStateType, since these
 987  * values are also used as symbols
 988  */
 989 enum ParserSymbol {
 990   /* Scope: pseudo-class */
 991   SYMBOL_NTH_CHILD = GTK_STATE_FOCUSED + 1,
 992   SYMBOL_FIRST_CHILD,
 993   SYMBOL_LAST_CHILD,
 994   SYMBOL_SORTED_CHILD,
 995
 996   /* Scope: nth-child */
 997   SYMBOL_NTH_CHILD_EVEN,
 998   SYMBOL_NTH_CHILD_ODD,
 999   SYMBOL_NTH_CHILD_FIRST,
1000   SYMBOL_NTH_CHILD_LAST
1001 };
1002
1003 enum {
1004   PARSING_ERROR,
1005   LAST_SIGNAL
1006 };
1007
1008 static guint css_provider_signals[LAST_SIGNAL] = { 0 };
1009
1010 static void gtk_css_provider_finalize (GObject *object);
1011 static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
1012
1013 static gboolean
1014 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
1015                                 GtkCssScanner  *scanner,
1016                                 GFile          *file,
1017                                 const char     *data,
1018                                 GError        **error);
1019
1020 GQuark
1021 gtk_css_provider_error_quark (void)
1022 {
1023   return g_quark_from_static_string ("gtk-css-provider-error-quark");
1024 }
1025
1026 G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
1027                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
1028                                                gtk_css_style_provider_iface_init));
1029
1030 static void
1031 gtk_css_provider_parsing_error (GtkCssProvider  *provider,
1032                                 GtkCssSection   *section,
1033                                 const GError    *error)
1034 {
1035   /* Only emit a warning when we have no error handlers. This is our
1036    * default handlers. And in this case erroneous CSS files are a bug
1037    * and should be fixed.
1038    * Note that these warnings can also be triggered by a broken theme
1039    * that people installed from some weird location on the internets.
1040    */
1041   if (!g_signal_has_handler_pending (provider,
1042                                      css_provider_signals[PARSING_ERROR],
1043                                      0,
1044                                      TRUE))
1045     {
1046       GFileInfo *info;
1047       GFile *file;
1048       const char *path;
1049
1050       file = gtk_css_section_get_file (section);
1051       if (file)
1052         {
1053           info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1054
1055           if (info)
1056             path = g_file_info_get_display_name (info);
1057           else
1058             path = "<broken file>";
1059         }
1060       else
1061         {
1062           info = NULL;
1063           path = "<data>";
1064         }
1065
1066       g_warning ("Theme parsing error: %s:%u:%u: %s",
1067                  path,
1068                  gtk_css_section_get_end_line (section) + 1,
1069                  gtk_css_section_get_end_position (section),
1070                  error->message);
1071
1072       if (info)
1073         g_object_unref (info);
1074     }
1075 }
1076
1077 static void
1078 gtk_css_provider_class_init (GtkCssProviderClass *klass)
1079 {
1080   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1081
1082   /**
1083    * GtkCssProvider::parsing-error:
1084    * @provider: the provider that had a parsing error
1085    * @section: section the error happened in
1086    * @error: The parsing error
1087    *
1088    * Signals that a parsing error occured. the @path, @line and @position
1089    * describe the actual location of the error as accurately as possible.
1090    *
1091    * Parsing errors are never fatal, so the parsing will resume after
1092    * the error. Errors may however cause parts of the given
1093    * data or even all of it to not be parsed at all. So it is a useful idea
1094    * to check that the parsing succeeds by connecting to this signal.
1095    *
1096    * Note that this signal may be emitted at any time as the css provider
1097    * may opt to defer parsing parts or all of the input to a later time
1098    * than when a loading function was called.
1099    */
1100   css_provider_signals[PARSING_ERROR] =
1101     g_signal_new (I_("parsing-error"),
1102                   G_TYPE_FROM_CLASS (object_class),
1103                   G_SIGNAL_RUN_LAST,
1104                   G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
1105                   NULL, NULL,
1106                   _gtk_marshal_VOID__BOXED_BOXED,
1107                   G_TYPE_NONE, 2, GTK_TYPE_CSS_SECTION, G_TYPE_ERROR);
1108
1109   object_class->finalize = gtk_css_provider_finalize;
1110
1111   klass->parsing_error = gtk_css_provider_parsing_error;
1112
1113   g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
1114 }
1115
1116 static void
1117 gtk_css_ruleset_init_copy (GtkCssRuleset       *new,
1118                            const GtkCssRuleset *ruleset,
1119                            GtkCssSelector      *selector)
1120 {
1121   memcpy (new, ruleset, sizeof (GtkCssRuleset));
1122
1123   new->selector = selector;
1124   if (new->widget_style)
1125     g_hash_table_ref (new->widget_style);
1126   if (new->style)
1127     g_hash_table_ref (new->style);
1128 }
1129
1130 static void
1131 gtk_css_ruleset_clear (GtkCssRuleset *ruleset)
1132 {
1133   if (ruleset->style)
1134     g_hash_table_unref (ruleset->style);
1135   if (ruleset->widget_style)
1136     g_hash_table_unref (ruleset->widget_style);
1137   if (ruleset->selector)
1138     _gtk_css_selector_free (ruleset->selector);
1139
1140   memset (ruleset, 0, sizeof (GtkCssRuleset));
1141 }
1142
1143 typedef struct _PropertyValue PropertyValue;
1144 struct _PropertyValue {
1145   GtkCssSection *section;
1146   GValue         value;
1147 };
1148
1149 static PropertyValue *
1150 property_value_new (GtkCssSection *section)
1151 {
1152   PropertyValue *value;
1153
1154   value = g_slice_new0 (PropertyValue);
1155
1156   value->section = gtk_css_section_ref (section);
1157
1158   return value;
1159 }
1160
1161 static void
1162 property_value_free (PropertyValue *value)
1163 {
1164   if (G_IS_VALUE (&value->value))
1165     g_value_unset (&value->value);
1166
1167   gtk_css_section_unref (value->section);
1168
1169   g_slice_free (PropertyValue, value);
1170 }
1171
1172 static void
1173 gtk_css_ruleset_add_style (GtkCssRuleset *ruleset,
1174                            char          *name,
1175                            PropertyValue *value)
1176 {
1177   if (ruleset->widget_style == NULL)
1178     ruleset->widget_style = g_hash_table_new_full (g_str_hash,
1179                                                    g_str_equal,
1180                                                    (GDestroyNotify) g_free,
1181                                                    (GDestroyNotify) property_value_free);
1182
1183   g_hash_table_insert (ruleset->widget_style, name, value);
1184 }
1185
1186 static void
1187 gtk_css_ruleset_add (GtkCssRuleset          *ruleset,
1188                      const GtkStyleProperty *prop,
1189                      PropertyValue          *value)
1190 {
1191   if (ruleset->style == NULL)
1192     ruleset->style = g_hash_table_new_full (g_direct_hash,
1193                                             g_direct_equal,
1194                                             NULL,
1195                                             (GDestroyNotify) property_value_free);
1196
1197   if (_gtk_style_property_is_shorthand (prop))
1198     {
1199       GParameter *parameters;
1200       guint i, n_parameters;
1201
1202       parameters = _gtk_style_property_unpack (prop, &value->value, &n_parameters);
1203
1204       for (i = 0; i < n_parameters; i++)
1205         {
1206           const GtkStyleProperty *child;
1207           PropertyValue *val;
1208
1209           child = _gtk_style_property_lookup (parameters[i].name);
1210           val = property_value_new (value->section);
1211           memcpy (&val->value, &parameters[i].value, sizeof (GValue));
1212           gtk_css_ruleset_add (ruleset, child, val);
1213         }
1214       g_free (parameters);
1215       property_value_free (value);
1216       return;
1217     }
1218
1219   ruleset->has_inherit |= _gtk_style_property_is_inherit (prop);
1220   g_hash_table_insert (ruleset->style, (gpointer) prop, value);
1221 }
1222
1223 static gboolean
1224 gtk_css_ruleset_matches (GtkCssRuleset *ruleset,
1225                          GtkWidgetPath *path,
1226                          guint          length)
1227 {
1228   return _gtk_css_selector_matches (ruleset->selector, path, length);
1229 }
1230
1231 static void
1232 gtk_css_scanner_destroy (GtkCssScanner *scanner)
1233 {
1234   g_object_unref (scanner->provider);
1235   if (scanner->file)
1236     g_object_unref (scanner->file);
1237   g_object_unref (scanner->base);
1238   _gtk_css_parser_free (scanner->parser);
1239
1240   g_slice_free (GtkCssScanner, scanner);
1241 }
1242
1243 static void
1244 gtk_css_provider_emit_error (GtkCssProvider *provider,
1245                              GtkCssScanner  *scanner,
1246                              const GError   *error)
1247 {
1248   g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
1249                  scanner->section, error);
1250 }
1251
1252 static void
1253 gtk_css_scanner_parser_error (GtkCssParser *parser,
1254                               const GError *error,
1255                               gpointer      user_data)
1256 {
1257   GtkCssScanner *scanner = user_data;
1258
1259   gtk_css_provider_emit_error (scanner->provider,
1260                                scanner,
1261                                error);
1262 }
1263
1264 static GtkCssScanner *
1265 gtk_css_scanner_new (GtkCssProvider *provider,
1266                      GtkCssScanner  *parent,
1267                      GtkCssSection  *section,
1268                      GFile          *file,
1269                      const gchar    *text)
1270 {
1271   GtkCssScanner *scanner;
1272
1273   scanner = g_slice_new0 (GtkCssScanner);
1274
1275   g_object_ref (provider);
1276   scanner->provider = provider;
1277   scanner->parent = parent;
1278   if (section)
1279     scanner->section = gtk_css_section_ref (section);
1280
1281   if (file)
1282     {
1283       scanner->file = g_object_ref (file);
1284       scanner->base = g_file_get_parent (file);
1285     }
1286   else
1287     {
1288       char *dir = g_get_current_dir ();
1289       scanner->base = g_file_new_for_path (dir);
1290       g_free (dir);
1291     }
1292
1293   scanner->parser = _gtk_css_parser_new (text,
1294                                          gtk_css_scanner_parser_error,
1295                                          scanner);
1296
1297   return scanner;
1298 }
1299
1300 static GFile *
1301 gtk_css_scanner_get_base_url (GtkCssScanner *scanner)
1302 {
1303   return scanner->base;
1304 }
1305
1306 static gboolean
1307 gtk_css_scanner_would_recurse (GtkCssScanner *scanner,
1308                                GFile         *file)
1309 {
1310   while (scanner)
1311     {
1312       if (scanner->file && g_file_equal (scanner->file, file))
1313         return TRUE;
1314
1315       scanner = scanner->parent;
1316     }
1317
1318   return FALSE;
1319 }
1320
1321 static void
1322 gtk_css_scanner_push_section (GtkCssScanner     *scanner,
1323                               GtkCssSectionType  section_type)
1324 {
1325   GtkCssSection *section;
1326
1327   section = _gtk_css_section_new (scanner->section,
1328                                   section_type,
1329                                   scanner->parser,
1330                                   scanner->file);
1331
1332   if (scanner->section)
1333     gtk_css_section_unref (scanner->section);
1334   scanner->section = section;
1335 }
1336
1337 static void
1338 gtk_css_scanner_pop_section (GtkCssScanner *scanner,
1339                              GtkCssSectionType check_type)
1340 {
1341   GtkCssSection *parent;
1342
1343   g_assert (gtk_css_section_get_section_type (scanner->section) == check_type);
1344
1345   parent = gtk_css_section_get_parent (scanner->section);
1346   if (parent)
1347     gtk_css_section_ref (parent);
1348
1349   _gtk_css_section_end (scanner->section);
1350   gtk_css_section_unref (scanner->section);
1351
1352   scanner->section = parent;
1353 }
1354
1355 static void
1356 gtk_css_provider_init (GtkCssProvider *css_provider)
1357 {
1358   GtkCssProviderPrivate *priv;
1359
1360   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1361                                                            GTK_TYPE_CSS_PROVIDER,
1362                                                            GtkCssProviderPrivate);
1363
1364   priv->rulesets = g_array_new (FALSE, FALSE, sizeof (GtkCssRuleset));
1365
1366   priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
1367                                                  (GDestroyNotify) g_free,
1368                                                  (GDestroyNotify) gtk_symbolic_color_unref);
1369 }
1370
1371 static void
1372 css_provider_dump_symbolic_colors (GtkCssProvider     *css_provider,
1373                                    GtkStyleProperties *props)
1374 {
1375   GtkCssProviderPrivate *priv;
1376   GHashTableIter iter;
1377   gpointer key, value;
1378
1379   priv = css_provider->priv;
1380   g_hash_table_iter_init (&iter, priv->symbolic_colors);
1381
1382   while (g_hash_table_iter_next (&iter, &key, &value))
1383     {
1384       const gchar *name;
1385       GtkSymbolicColor *color;
1386
1387       name = key;
1388       color = value;
1389
1390       gtk_style_properties_map_color (props, name, color);
1391     }
1392 }
1393
1394 static GtkStyleProperties *
1395 gtk_css_provider_get_style (GtkStyleProvider *provider,
1396                             GtkWidgetPath    *path)
1397 {
1398   GtkCssProvider *css_provider;
1399   GtkCssProviderPrivate *priv;
1400   GtkStyleProperties *props;
1401   guint i, l, length;
1402
1403   css_provider = GTK_CSS_PROVIDER (provider);
1404   priv = css_provider->priv;
1405   length = gtk_widget_path_length (path);
1406   props = gtk_style_properties_new ();
1407
1408   css_provider_dump_symbolic_colors (css_provider, props);
1409
1410   for (l = 1; l <= length; l++)
1411     {
1412       for (i = 0; i < priv->rulesets->len; i++)
1413         {
1414           GtkCssRuleset *ruleset;
1415           GHashTableIter iter;
1416           gpointer key, val;
1417
1418           ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1419
1420           if (ruleset->style == NULL)
1421             continue;
1422
1423           if (l < length && (!ruleset->has_inherit || _gtk_css_selector_get_state_flags (ruleset->selector)))
1424             continue;
1425
1426           if (!gtk_css_ruleset_matches (ruleset, path, l))
1427             continue;
1428
1429           g_hash_table_iter_init (&iter, ruleset->style);
1430
1431           while (g_hash_table_iter_next (&iter, &key, &val))
1432             {
1433               GtkStyleProperty *prop = key;
1434               PropertyValue *value = val;
1435
1436               if (l != length && !_gtk_style_property_is_inherit (prop))
1437                 continue;
1438
1439               _gtk_style_properties_set_property_by_property (props,
1440                                                               prop,
1441                                                               _gtk_css_selector_get_state_flags (ruleset->selector),
1442                                                               &value->value);
1443             }
1444         }
1445     }
1446
1447   return props;
1448 }
1449
1450 static gboolean
1451 gtk_css_provider_get_style_property (GtkStyleProvider *provider,
1452                                      GtkWidgetPath    *path,
1453                                      GtkStateFlags     state,
1454                                      GParamSpec       *pspec,
1455                                      GValue           *value)
1456 {
1457   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1458   GtkCssProviderPrivate *priv = css_provider->priv;
1459   PropertyValue *val;
1460   gboolean found = FALSE;
1461   gchar *prop_name;
1462   gint i;
1463
1464   prop_name = g_strdup_printf ("-%s-%s",
1465                                g_type_name (pspec->owner_type),
1466                                pspec->name);
1467
1468   for (i = priv->rulesets->len - 1; i >= 0; i--)
1469     {
1470       GtkCssRuleset *ruleset;
1471       GtkStateFlags selector_state;
1472
1473       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1474
1475       if (ruleset->widget_style == NULL)
1476         continue;
1477
1478       if (!gtk_css_ruleset_matches (ruleset, path, gtk_widget_path_length (path)))
1479         continue;
1480
1481       selector_state = _gtk_css_selector_get_state_flags (ruleset->selector);
1482       val = g_hash_table_lookup (ruleset->widget_style, prop_name);
1483
1484       if (val &&
1485           (selector_state == 0 ||
1486            selector_state == state ||
1487            ((selector_state & state) != 0 &&
1488             (selector_state & ~(state)) == 0)))
1489         {
1490           GtkCssScanner *scanner;
1491
1492           scanner = gtk_css_scanner_new (css_provider,
1493                                          NULL,
1494                                          val->section,
1495                                          gtk_css_section_get_file (val->section),
1496                                          g_value_get_string (&val->value));
1497
1498           found = _gtk_style_property_parse_value (NULL,
1499                                                    value,
1500                                                    scanner->parser,
1501                                                    NULL);
1502
1503           gtk_css_scanner_destroy (scanner);
1504
1505           if (found)
1506             break;
1507         }
1508     }
1509
1510   g_free (prop_name);
1511
1512   return found;
1513 }
1514
1515 static void
1516 gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
1517 {
1518   iface->get_style = gtk_css_provider_get_style;
1519   iface->get_style_property = gtk_css_provider_get_style_property;
1520 }
1521
1522 static void
1523 gtk_css_provider_finalize (GObject *object)
1524 {
1525   GtkCssProvider *css_provider;
1526   GtkCssProviderPrivate *priv;
1527   guint i;
1528
1529   css_provider = GTK_CSS_PROVIDER (object);
1530   priv = css_provider->priv;
1531
1532   for (i = 0; i < priv->rulesets->len; i++)
1533     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1534
1535   g_array_free (priv->rulesets, TRUE);
1536
1537   if (priv->symbolic_colors)
1538     g_hash_table_destroy (priv->symbolic_colors);
1539
1540   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1541 }
1542
1543 /**
1544  * gtk_css_provider_new:
1545  *
1546  * Returns a newly created #GtkCssProvider.
1547  *
1548  * Returns: A new #GtkCssProvider
1549  **/
1550 GtkCssProvider *
1551 gtk_css_provider_new (void)
1552 {
1553   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1554 }
1555
1556 static void
1557 gtk_css_provider_take_error (GtkCssProvider *provider,
1558                              GtkCssScanner  *scanner,
1559                              GError         *error)
1560 {
1561   gtk_css_provider_emit_error (scanner->provider,
1562                                scanner,
1563                                error);
1564
1565   g_error_free (error);
1566 }
1567
1568 static void
1569 gtk_css_provider_error_literal (GtkCssProvider *provider,
1570                                 GtkCssScanner  *scanner,
1571                                 GQuark          domain,
1572                                 gint            code,
1573                                 const char     *message)
1574 {
1575   gtk_css_provider_take_error (provider,
1576                                scanner,
1577                                g_error_new_literal (domain, code, message));
1578 }
1579
1580 static void
1581 gtk_css_provider_error (GtkCssProvider *provider,
1582                         GtkCssScanner  *scanner,
1583                         GQuark          domain,
1584                         gint            code,
1585                         const char     *format,
1586                         ...)  G_GNUC_PRINTF (5, 6);
1587 static void
1588 gtk_css_provider_error (GtkCssProvider *provider,
1589                         GtkCssScanner  *scanner,
1590                         GQuark          domain,
1591                         gint            code,
1592                         const char     *format,
1593                         ...)
1594 {
1595   GError *error;
1596   va_list args;
1597
1598   va_start (args, format);
1599   error = g_error_new_valist (domain, code, format, args);
1600   va_end (args);
1601
1602   gtk_css_provider_take_error (provider, scanner, error);
1603 }
1604
1605 static void
1606 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1607                                 GtkCssScanner  *scanner,
1608                                 const char     *expected)
1609 {
1610   gtk_css_provider_error (provider,
1611                           scanner,
1612                           GTK_CSS_PROVIDER_ERROR,
1613                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1614                           "expected a valid %s", expected);
1615 }
1616
1617 static void
1618 css_provider_commit (GtkCssProvider *css_provider,
1619                      GSList         *selectors,
1620                      GtkCssRuleset  *ruleset)
1621 {
1622   GtkCssProviderPrivate *priv;
1623   GSList *l;
1624
1625   priv = css_provider->priv;
1626
1627   if (ruleset->style == NULL && ruleset->widget_style == NULL)
1628     {
1629       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
1630       return;
1631     }
1632
1633   for (l = selectors; l; l = l->next)
1634     {
1635       GtkCssRuleset new;
1636
1637       gtk_css_ruleset_init_copy (&new, ruleset, l->data);
1638
1639       g_array_append_val (priv->rulesets, new);
1640     }
1641
1642   g_slist_free (selectors);
1643 }
1644
1645 static void
1646 gtk_css_provider_reset (GtkCssProvider *css_provider)
1647 {
1648   GtkCssProviderPrivate *priv;
1649   guint i;
1650
1651   priv = css_provider->priv;
1652
1653   g_hash_table_remove_all (priv->symbolic_colors);
1654
1655   for (i = 0; i < priv->rulesets->len; i++)
1656     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1657   g_array_set_size (priv->rulesets, 0);
1658 }
1659
1660 static void
1661 gtk_css_provider_propagate_error (GtkCssProvider  *provider,
1662                                   GtkCssSection   *section,
1663                                   const GError    *error,
1664                                   GError         **propagate_to)
1665 {
1666
1667   GFileInfo *info;
1668   GFile *file;
1669   const char *path;
1670
1671   file = gtk_css_section_get_file (section);
1672   if (file)
1673     {
1674       info = g_file_query_info (file,G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1675
1676       if (info)
1677         path = g_file_info_get_display_name (info);
1678       else
1679         path = "<broken file>";
1680     }
1681   else
1682     {
1683       info = NULL;
1684       path = "<unknown>";
1685     }
1686
1687   /* don't fail for deprecations */
1688   if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
1689     {
1690       g_warning ("Theme parsing error: %s:%u:%u: %s", path,
1691                  gtk_css_section_get_end_line (section) + 1,
1692                  gtk_css_section_get_end_position (section), error->message);
1693       return;
1694     }
1695
1696   /* we already set an error. And we'd like to keep the first one */
1697   if (*propagate_to)
1698     return;
1699
1700   *propagate_to = g_error_copy (error);
1701   g_prefix_error (propagate_to, "%s:%u:%u: ", path,
1702                   gtk_css_section_get_end_line (section) + 1,
1703                   gtk_css_section_get_end_position (section));
1704
1705   if (info)
1706     g_object_unref (info);
1707 }
1708
1709 static gboolean
1710 parse_import (GtkCssScanner *scanner)
1711 {
1712   GFile *file;
1713   char *uri;
1714
1715   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_IMPORT);
1716
1717   if (!_gtk_css_parser_try (scanner->parser, "@import", TRUE))
1718     {
1719       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1720       return FALSE;
1721     }
1722
1723   if (_gtk_css_parser_is_string (scanner->parser))
1724     uri = _gtk_css_parser_read_string (scanner->parser);
1725   else
1726     uri = _gtk_css_parser_read_uri (scanner->parser);
1727
1728   if (uri == NULL)
1729     {
1730       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1731       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1732       return TRUE;
1733     }
1734
1735   file = g_file_resolve_relative_path (gtk_css_scanner_get_base_url (scanner), uri);
1736   g_free (uri);
1737
1738   if (gtk_css_scanner_would_recurse (scanner, file))
1739     {
1740        char *path = g_file_get_path (file);
1741        gtk_css_provider_error (scanner->provider,
1742                                scanner,
1743                                GTK_CSS_PROVIDER_ERROR,
1744                                GTK_CSS_PROVIDER_ERROR_IMPORT,
1745                                "Loading '%s' would recurse",
1746                                path);
1747        g_free (path);
1748     }
1749   else
1750     {
1751       gtk_css_provider_load_internal (scanner->provider,
1752                                       scanner,
1753                                       file,
1754                                       NULL,
1755                                       NULL);
1756     }
1757
1758   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1759     {
1760       gtk_css_provider_invalid_token (scanner->provider, scanner, "semicolon");
1761       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1762     }
1763
1764   g_object_unref (file);
1765
1766   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1767   return TRUE;
1768 }
1769
1770 static gboolean
1771 parse_color_definition (GtkCssScanner *scanner)
1772 {
1773   GtkSymbolicColor *symbolic;
1774   char *name;
1775
1776   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1777
1778   if (!_gtk_css_parser_try (scanner->parser, "@define-color", TRUE))
1779     {
1780       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1781       return FALSE;
1782     }
1783
1784   name = _gtk_css_parser_try_name (scanner->parser, TRUE);
1785   if (name == NULL)
1786     {
1787       gtk_css_provider_error_literal (scanner->provider,
1788                                       scanner,
1789                                       GTK_CSS_PROVIDER_ERROR,
1790                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1791                                       "Not a valid color name");
1792       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1793       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1794       return TRUE;
1795     }
1796
1797   symbolic = _gtk_css_parser_read_symbolic_color (scanner->parser);
1798   if (symbolic == NULL)
1799     {
1800       g_free (name);
1801       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1802       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1803       return TRUE;
1804     }
1805
1806   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1807     {
1808       g_free (name);
1809       gtk_symbolic_color_unref (symbolic);
1810       gtk_css_provider_error_literal (scanner->provider,
1811                                       scanner,
1812                                       GTK_CSS_PROVIDER_ERROR,
1813                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1814                                       "Missing semicolon at end of color definition");
1815       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1816
1817       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1818       return TRUE;
1819     }
1820
1821   g_hash_table_insert (scanner->provider->priv->symbolic_colors, name, symbolic);
1822
1823   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1824   return TRUE;
1825 }
1826
1827 static gboolean
1828 parse_binding_set (GtkCssScanner *scanner)
1829 {
1830   GtkBindingSet *binding_set;
1831   char *name;
1832
1833   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1834
1835   if (!_gtk_css_parser_try (scanner->parser, "@binding-set", TRUE))
1836     {
1837       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1838       return FALSE;
1839     }
1840
1841   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1842   if (name == NULL)
1843     {
1844       gtk_css_provider_error_literal (scanner->provider,
1845                                       scanner,
1846                                       GTK_CSS_PROVIDER_ERROR,
1847                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1848                                       "Expected name for binding set");
1849       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1850       goto skip_semicolon;
1851     }
1852
1853   binding_set = gtk_binding_set_find (name);
1854   if (!binding_set)
1855     {
1856       binding_set = gtk_binding_set_new (name);
1857       binding_set->parsed = TRUE;
1858     }
1859   g_free (name);
1860
1861   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
1862     {
1863       gtk_css_provider_error_literal (scanner->provider,
1864                                       scanner,
1865                                       GTK_CSS_PROVIDER_ERROR,
1866                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1867                                       "Expected '{' for binding set");
1868       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1869       goto skip_semicolon;
1870     }
1871
1872   while (!_gtk_css_parser_is_eof (scanner->parser) &&
1873          !_gtk_css_parser_begins_with (scanner->parser, '}'))
1874     {
1875       name = _gtk_css_parser_read_value (scanner->parser);
1876       if (name == NULL)
1877         {
1878           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1879           continue;
1880         }
1881
1882       if (gtk_binding_entry_add_signal_from_string (binding_set, name) != G_TOKEN_NONE)
1883         {
1884           gtk_css_provider_error_literal (scanner->provider,
1885                                           scanner,
1886                                           GTK_CSS_PROVIDER_ERROR,
1887                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1888                                           "Failed to parse binding set.");
1889         }
1890
1891       g_free (name);
1892
1893       if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1894         {
1895           if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
1896               !_gtk_css_parser_is_eof (scanner->parser))
1897             {
1898               gtk_css_provider_error_literal (scanner->provider,
1899                                               scanner,
1900                                               GTK_CSS_PROVIDER_ERROR,
1901                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
1902                                               "Expected semicolon");
1903               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1904             }
1905         }
1906     }
1907
1908   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
1909     {
1910       gtk_css_provider_error_literal (scanner->provider,
1911                                       scanner,
1912                                       GTK_CSS_PROVIDER_ERROR,
1913                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1914                                       "expected '}' after declarations");
1915       if (!_gtk_css_parser_is_eof (scanner->parser))
1916         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
1917     }
1918
1919 skip_semicolon:
1920   if (_gtk_css_parser_begins_with (scanner->parser, ';'))
1921     {
1922       gtk_css_provider_error_literal (scanner->provider,
1923                                       scanner,
1924                                       GTK_CSS_PROVIDER_ERROR,
1925                                       GTK_CSS_PROVIDER_ERROR_DEPRECATED,
1926                                       "Nonstandard semicolon at end of binding set");
1927       _gtk_css_parser_try (scanner->parser, ";", TRUE);
1928     }
1929
1930   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1931
1932   return TRUE;
1933 }
1934
1935 static void
1936 parse_at_keyword (GtkCssScanner *scanner)
1937 {
1938   if (parse_import (scanner))
1939     return;
1940   if (parse_color_definition (scanner))
1941     return;
1942   if (parse_binding_set (scanner))
1943     return;
1944
1945   else
1946     {
1947       gtk_css_provider_error_literal (scanner->provider,
1948                                       scanner,
1949                                       GTK_CSS_PROVIDER_ERROR,
1950                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1951                                       "unknown @ rule");
1952       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1953     }
1954 }
1955
1956 static gboolean
1957 parse_selector_class (GtkCssScanner *scanner, GArray *classes)
1958 {
1959   GQuark qname;
1960   char *name;
1961
1962   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
1963
1964   if (name == NULL)
1965     {
1966       gtk_css_provider_error_literal (scanner->provider,
1967                                       scanner,
1968                                       GTK_CSS_PROVIDER_ERROR,
1969                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1970                                       "Expected a valid name for class");
1971       return FALSE;
1972     }
1973
1974   qname = g_quark_from_string (name);
1975   g_array_append_val (classes, qname);
1976   g_free (name);
1977   return TRUE;
1978 }
1979
1980 static gboolean
1981 parse_selector_name (GtkCssScanner *scanner, GArray *names)
1982 {
1983   GQuark qname;
1984   char *name;
1985
1986   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
1987
1988   if (name == NULL)
1989     {
1990       gtk_css_provider_error_literal (scanner->provider,
1991                                       scanner,
1992                                       GTK_CSS_PROVIDER_ERROR,
1993                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1994                                       "Expected a valid name for id");
1995       return FALSE;
1996     }
1997
1998   qname = g_quark_from_string (name);
1999   g_array_append_val (names, qname);
2000   g_free (name);
2001   return TRUE;
2002 }
2003
2004 static gboolean
2005 parse_selector_pseudo_class (GtkCssScanner  *scanner,
2006                              GtkRegionFlags *region_to_modify,
2007                              GtkStateFlags  *state_to_modify)
2008 {
2009   struct {
2010     const char *name;
2011     GtkRegionFlags region_flag;
2012     GtkStateFlags state_flag;
2013   } pseudo_classes[] = {
2014     { "first-child",  GTK_REGION_FIRST, 0 },
2015     { "last-child",   GTK_REGION_LAST, 0 },
2016     { "sorted",       GTK_REGION_SORTED, 0 },
2017     { "active",       0, GTK_STATE_FLAG_ACTIVE },
2018     { "prelight",     0, GTK_STATE_FLAG_PRELIGHT },
2019     { "hover",        0, GTK_STATE_FLAG_PRELIGHT },
2020     { "selected",     0, GTK_STATE_FLAG_SELECTED },
2021     { "insensitive",  0, GTK_STATE_FLAG_INSENSITIVE },
2022     { "inconsistent", 0, GTK_STATE_FLAG_INCONSISTENT },
2023     { "focused",      0, GTK_STATE_FLAG_FOCUSED },
2024     { "focus",        0, GTK_STATE_FLAG_FOCUSED },
2025     { NULL, }
2026   }, nth_child_classes[] = {
2027     { "first",        GTK_REGION_FIRST, 0 },
2028     { "last",         GTK_REGION_LAST, 0 },
2029     { "even",         GTK_REGION_EVEN, 0 },
2030     { "odd",          GTK_REGION_ODD, 0 },
2031     { NULL, }
2032   }, *classes;
2033   guint i;
2034   char *name;
2035
2036   name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
2037   if (name == NULL)
2038     {
2039       gtk_css_provider_error_literal (scanner->provider,
2040                                       scanner,
2041                                       GTK_CSS_PROVIDER_ERROR,
2042                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2043                                       "Missing name of pseudo-class");
2044       return FALSE;
2045     }
2046
2047   if (_gtk_css_parser_try (scanner->parser, "(", TRUE))
2048     {
2049       char *function = name;
2050
2051       name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2052       if (!_gtk_css_parser_try (scanner->parser, ")", FALSE))
2053         {
2054           gtk_css_provider_error_literal (scanner->provider,
2055                                           scanner,
2056                                           GTK_CSS_PROVIDER_ERROR,
2057                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2058                                           "Missing closing bracket for pseudo-class");
2059           return FALSE;
2060         }
2061
2062       if (g_ascii_strcasecmp (function, "nth-child") != 0)
2063         {
2064           gtk_css_provider_error (scanner->provider,
2065                                   scanner,
2066                                   GTK_CSS_PROVIDER_ERROR,
2067                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2068                                   "Unknown pseudo-class '%s(%s)'", function, name ? name : "");
2069           g_free (function);
2070           g_free (name);
2071           return FALSE;
2072         }
2073
2074       g_free (function);
2075
2076       if (name == NULL)
2077         {
2078           gtk_css_provider_error (scanner->provider,
2079                                   scanner,
2080                                   GTK_CSS_PROVIDER_ERROR,
2081                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2082                                   "nth-child() requires an argument");
2083           return FALSE;
2084         }
2085
2086       classes = nth_child_classes;
2087     }
2088   else
2089     classes = pseudo_classes;
2090
2091   for (i = 0; classes[i].name != NULL; i++)
2092     {
2093       if (g_ascii_strcasecmp (name, classes[i].name) == 0)
2094         {
2095           if ((*region_to_modify & classes[i].region_flag) ||
2096               (*state_to_modify & classes[i].state_flag))
2097             {
2098               if (classes == nth_child_classes)
2099                 gtk_css_provider_error (scanner->provider,
2100                                         scanner,
2101                                         GTK_CSS_PROVIDER_ERROR,
2102                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
2103                                         "Duplicate pseudo-class 'nth-child(%s)'", name);
2104               else
2105                 gtk_css_provider_error (scanner->provider,
2106                                         scanner,
2107                                         GTK_CSS_PROVIDER_ERROR,
2108                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
2109                                         "Duplicate pseudo-class '%s'", name);
2110             }
2111           *region_to_modify |= classes[i].region_flag;
2112           *state_to_modify |= classes[i].state_flag;
2113
2114           g_free (name);
2115           return TRUE;
2116         }
2117     }
2118
2119   if (classes == nth_child_classes)
2120     gtk_css_provider_error (scanner->provider,
2121                             scanner,
2122                             GTK_CSS_PROVIDER_ERROR,
2123                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2124                             "Unknown pseudo-class 'nth-child(%s)'", name);
2125   else
2126     gtk_css_provider_error (scanner->provider,
2127                             scanner,
2128                             GTK_CSS_PROVIDER_ERROR,
2129                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2130                             "Unknown pseudo-class '%s'", name);
2131   g_free (name);
2132   return FALSE;
2133 }
2134
2135 static gboolean
2136 parse_simple_selector (GtkCssScanner *scanner,
2137                        char **name,
2138                        GArray *ids,
2139                        GArray *classes,
2140                        GtkRegionFlags *pseudo_classes,
2141                        GtkStateFlags *state)
2142 {
2143   gboolean parsed_something;
2144
2145   *name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
2146   if (*name)
2147     parsed_something = TRUE;
2148   else
2149     parsed_something = _gtk_css_parser_try (scanner->parser, "*", FALSE);
2150
2151   do {
2152       if (_gtk_css_parser_try (scanner->parser, "#", FALSE))
2153         {
2154           if (!parse_selector_name (scanner, ids))
2155             return FALSE;
2156         }
2157       else if (_gtk_css_parser_try (scanner->parser, ".", FALSE))
2158         {
2159           if (!parse_selector_class (scanner, classes))
2160             return FALSE;
2161         }
2162       else if (_gtk_css_parser_try (scanner->parser, ":", FALSE))
2163         {
2164           if (!parse_selector_pseudo_class (scanner, pseudo_classes, state))
2165             return FALSE;
2166         }
2167       else if (!parsed_something)
2168         {
2169           gtk_css_provider_error_literal (scanner->provider,
2170                                           scanner,
2171                                           GTK_CSS_PROVIDER_ERROR,
2172                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2173                                           "Expected a valid selector");
2174           return FALSE;
2175         }
2176       else
2177         break;
2178
2179       parsed_something = TRUE;
2180     }
2181   while (!_gtk_css_parser_is_eof (scanner->parser));
2182
2183   _gtk_css_parser_skip_whitespace (scanner->parser);
2184   return TRUE;
2185 }
2186
2187 static GtkCssSelector *
2188 parse_selector (GtkCssScanner *scanner)
2189 {
2190   GtkCssSelector *selector = NULL;
2191
2192   do {
2193       char *name = NULL;
2194       GArray *ids = g_array_new (TRUE, FALSE, sizeof (GQuark));
2195       GArray *classes = g_array_new (TRUE, FALSE, sizeof (GQuark));
2196       GtkRegionFlags pseudo_classes = 0;
2197       GtkStateFlags state = 0;
2198       GtkCssCombinator combine = GTK_CSS_COMBINE_DESCANDANT;
2199
2200       if (selector)
2201         {
2202           if (_gtk_css_parser_try (scanner->parser, ">", TRUE))
2203             combine = GTK_CSS_COMBINE_CHILD;
2204         }
2205
2206       if (!parse_simple_selector (scanner, &name, ids, classes, &pseudo_classes, &state))
2207         {
2208           g_array_free (ids, TRUE);
2209           g_array_free (classes, TRUE);
2210           if (selector)
2211             _gtk_css_selector_free (selector);
2212           return NULL;
2213         }
2214
2215       selector = _gtk_css_selector_new (selector,
2216                                         combine,
2217                                         name,
2218                                         (GQuark *) g_array_free (ids, ids->len == 0),
2219                                         (GQuark *) g_array_free (classes, classes->len == 0),
2220                                         pseudo_classes,
2221                                         state);
2222       g_free (name);
2223     }
2224   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2225          !_gtk_css_parser_begins_with (scanner->parser, ',') &&
2226          !_gtk_css_parser_begins_with (scanner->parser, '{'));
2227
2228   return selector;
2229 }
2230
2231 static GSList *
2232 parse_selector_list (GtkCssScanner *scanner)
2233 {
2234   GSList *selectors = NULL;
2235
2236   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_SELECTOR);
2237
2238   do {
2239       GtkCssSelector *select = parse_selector (scanner);
2240
2241       if (select == NULL)
2242         {
2243           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2244           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2245           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2246           return NULL;
2247         }
2248
2249       selectors = g_slist_prepend (selectors, select);
2250     }
2251   while (_gtk_css_parser_try (scanner->parser, ",", TRUE));
2252
2253   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2254
2255   return selectors;
2256 }
2257
2258 static void
2259 parse_declaration (GtkCssScanner *scanner,
2260                    GtkCssRuleset *ruleset)
2261 {
2262   const GtkStyleProperty *property;
2263   char *name;
2264
2265   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DECLARATION);
2266
2267   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2268   if (name == NULL)
2269     goto check_for_semicolon;
2270
2271   property = _gtk_style_property_lookup (name);
2272   if (property == NULL && name[0] != '-')
2273     {
2274       gtk_css_provider_error (scanner->provider,
2275                               scanner,
2276                               GTK_CSS_PROVIDER_ERROR,
2277                               GTK_CSS_PROVIDER_ERROR_NAME,
2278                               "'%s' is not a valid property name",
2279                               name);
2280       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2281       g_free (name);
2282       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2283       return;
2284     }
2285
2286   if (!_gtk_css_parser_try (scanner->parser, ":", TRUE))
2287     {
2288       gtk_css_provider_invalid_token (scanner->provider, scanner, "':'");
2289       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2290       g_free (name);
2291       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2292       return;
2293     }
2294
2295   if (property)
2296     {
2297       PropertyValue *val;
2298
2299       g_free (name);
2300
2301       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2302
2303       val = property_value_new (scanner->section);
2304       g_value_init (&val->value, property->pspec->value_type);
2305
2306       if (_gtk_style_property_parse_value (property,
2307                                            &val->value,
2308                                            scanner->parser,
2309                                            gtk_css_scanner_get_base_url (scanner)))
2310         {
2311           if (_gtk_css_parser_begins_with (scanner->parser, ';') ||
2312               _gtk_css_parser_begins_with (scanner->parser, '}') ||
2313               _gtk_css_parser_is_eof (scanner->parser))
2314             {
2315               gtk_css_ruleset_add (ruleset, property, val);
2316             }
2317           else
2318             {
2319               gtk_css_provider_error_literal (scanner->provider,
2320                                               scanner,
2321                                               GTK_CSS_PROVIDER_ERROR,
2322                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
2323                                               "Junk at end of value");
2324               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2325               property_value_free (val);
2326               gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2327               gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2328               return;
2329             }
2330         }
2331       else
2332         {
2333           property_value_free (val);
2334           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2335           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2336           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2337           return;
2338         }
2339       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2340     }
2341   else if (name[0] == '-')
2342     {
2343       char *value_str;
2344
2345       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2346
2347       value_str = _gtk_css_parser_read_value (scanner->parser);
2348       if (value_str)
2349         {
2350           PropertyValue *val;
2351
2352           val = property_value_new (scanner->section);
2353           g_value_init (&val->value, G_TYPE_STRING);
2354           g_value_take_string (&val->value, value_str);
2355
2356           gtk_css_ruleset_add_style (ruleset, name, val);
2357         }
2358       else
2359         {
2360           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2361           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2362           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2363           return;
2364         }
2365
2366       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2367     }
2368   else
2369     g_free (name);
2370
2371 check_for_semicolon:
2372   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2373
2374   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2375     {
2376       if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2377           !_gtk_css_parser_is_eof (scanner->parser))
2378         {
2379           gtk_css_provider_error_literal (scanner->provider,
2380                                           scanner,
2381                                           GTK_CSS_PROVIDER_ERROR,
2382                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2383                                           "Expected semicolon");
2384           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2385         }
2386     }
2387 }
2388
2389 static void
2390 parse_declarations (GtkCssScanner *scanner,
2391                     GtkCssRuleset *ruleset)
2392 {
2393   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2394          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2395     {
2396       parse_declaration (scanner, ruleset);
2397     }
2398 }
2399
2400 static void
2401 parse_ruleset (GtkCssScanner *scanner)
2402 {
2403   GSList *selectors;
2404   GtkCssRuleset ruleset = { 0, };
2405
2406   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_RULESET);
2407
2408   selectors = parse_selector_list (scanner);
2409   if (selectors == NULL)
2410     {
2411       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2412       return;
2413     }
2414
2415   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2416     {
2417       gtk_css_provider_error_literal (scanner->provider,
2418                                       scanner,
2419                                       GTK_CSS_PROVIDER_ERROR,
2420                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2421                                       "expected '{' after selectors");
2422       _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2423       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2424       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2425       return;
2426     }
2427
2428   parse_declarations (scanner, &ruleset);
2429
2430   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2431     {
2432       gtk_css_provider_error_literal (scanner->provider,
2433                                       scanner,
2434                                       GTK_CSS_PROVIDER_ERROR,
2435                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2436                                       "expected '}' after declarations");
2437       if (!_gtk_css_parser_is_eof (scanner->parser))
2438         {
2439           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2440           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2441           gtk_css_ruleset_clear (&ruleset);
2442           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2443         }
2444     }
2445
2446   css_provider_commit (scanner->provider, selectors, &ruleset);
2447   gtk_css_ruleset_clear (&ruleset);
2448   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2449 }
2450
2451 static void
2452 parse_statement (GtkCssScanner *scanner)
2453 {
2454   if (_gtk_css_parser_begins_with (scanner->parser, '@'))
2455     parse_at_keyword (scanner);
2456   else
2457     parse_ruleset (scanner);
2458 }
2459
2460 static void
2461 parse_stylesheet (GtkCssScanner *scanner)
2462 {
2463   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2464
2465   _gtk_css_parser_skip_whitespace (scanner->parser);
2466
2467   while (!_gtk_css_parser_is_eof (scanner->parser))
2468     {
2469       if (_gtk_css_parser_try (scanner->parser, "<!--", TRUE) ||
2470           _gtk_css_parser_try (scanner->parser, "-->", TRUE))
2471         continue;
2472
2473       parse_statement (scanner);
2474     }
2475
2476   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2477 }
2478
2479 static int
2480 gtk_css_provider_compare_rule (gconstpointer a_,
2481                                gconstpointer b_)
2482 {
2483   const GtkCssRuleset *a = (const GtkCssRuleset *) a_;
2484   const GtkCssRuleset *b = (const GtkCssRuleset *) b_;
2485   int compare;
2486
2487   compare = _gtk_css_selector_compare (a->selector, b->selector);
2488   if (compare != 0)
2489     return compare;
2490
2491   /* compare pointers in array to ensure a stable sort */
2492   if (a_ < b_)
2493     return -1;
2494
2495   if (a_ > b_)
2496     return 1;
2497
2498   return 0;
2499 }
2500
2501 static void
2502 gtk_css_provider_postprocess (GtkCssProvider *css_provider)
2503 {
2504   GtkCssProviderPrivate *priv = css_provider->priv;
2505
2506   g_array_sort (priv->rulesets, gtk_css_provider_compare_rule);
2507 }
2508
2509 static gboolean
2510 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
2511                                 GtkCssScanner  *parent,
2512                                 GFile          *file,
2513                                 const char     *text,
2514                                 GError        **error)
2515 {
2516   GtkCssScanner *scanner;
2517   gulong error_handler;
2518   char *free_data = NULL;
2519
2520   if (error)
2521     error_handler = g_signal_connect (css_provider,
2522                                       "parsing-error",
2523                                       G_CALLBACK (gtk_css_provider_propagate_error),
2524                                       error);
2525   else
2526     error_handler = 0; /* silence gcc */
2527
2528   if (text == NULL)
2529     {
2530       GError *load_error = NULL;
2531
2532       if (g_file_load_contents (file, NULL,
2533                                 &free_data, NULL,
2534                                 NULL, &load_error))
2535         {
2536           text = free_data;
2537         }
2538       else
2539         {
2540           GtkCssSection *section;
2541
2542           if (parent)
2543             section = gtk_css_section_ref (parent->section);
2544           else
2545             section = _gtk_css_section_new_for_file (GTK_CSS_SECTION_DOCUMENT, file);
2546
2547           gtk_css_provider_error (css_provider,
2548                                   parent,
2549                                   GTK_CSS_PROVIDER_ERROR,
2550                                   GTK_CSS_PROVIDER_ERROR_IMPORT,
2551                                   "Failed to import: %s",
2552                                   load_error->message);
2553
2554           gtk_css_section_unref (section);
2555         }
2556     }
2557
2558   if (text)
2559     {
2560       scanner = gtk_css_scanner_new (css_provider,
2561                                      parent,
2562                                      parent ? parent->section : NULL,
2563                                      file,
2564                                      text);
2565
2566       parse_stylesheet (scanner);
2567
2568       gtk_css_scanner_destroy (scanner);
2569
2570       if (parent == NULL)
2571         gtk_css_provider_postprocess (css_provider);
2572     }
2573
2574   g_free (free_data);
2575
2576   if (error)
2577     {
2578       g_signal_handler_disconnect (css_provider, error_handler);
2579
2580       if (*error)
2581         {
2582           /* We clear all contents from the provider for backwards compat reasons */
2583           gtk_css_provider_reset (css_provider);
2584           return FALSE;
2585         }
2586     }
2587
2588   return TRUE;
2589 }
2590
2591 /**
2592  * gtk_css_provider_load_from_data:
2593  * @css_provider: a #GtkCssProvider
2594  * @data: (array length=length) (element-type guint8): CSS data loaded in memory
2595  * @length: the length of @data in bytes, or -1 for NUL terminated strings. If
2596  *   @length is not -1, the code will assume it is not NUL terminated and will
2597  *   potentially do a copy.
2598  * @error: (out) (allow-none): return location for a #GError, or %NULL
2599  *
2600  * Loads @data into @css_provider, making it clear any previously loaded
2601  * information.
2602  *
2603  * Returns: %TRUE if the data could be loaded.
2604  **/
2605 gboolean
2606 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2607                                  const gchar     *data,
2608                                  gssize           length,
2609                                  GError         **error)
2610 {
2611   char *free_data;
2612   gboolean ret;
2613
2614   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2615   g_return_val_if_fail (data != NULL, FALSE);
2616
2617   if (length < 0)
2618     {
2619       length = strlen (data);
2620       free_data = NULL;
2621     }
2622   else
2623     {
2624       free_data = g_strndup (data, length);
2625       data = free_data;
2626     }
2627
2628   gtk_css_provider_reset (css_provider);
2629
2630   ret = gtk_css_provider_load_internal (css_provider, NULL, NULL, data, error);
2631
2632   g_free (free_data);
2633
2634   return ret;
2635 }
2636
2637 /**
2638  * gtk_css_provider_load_from_file:
2639  * @css_provider: a #GtkCssProvider
2640  * @file: #GFile pointing to a file to load
2641  * @error: (out) (allow-none): return location for a #GError, or %NULL
2642  *
2643  * Loads the data contained in @file into @css_provider, making it
2644  * clear any previously loaded information.
2645  *
2646  * Returns: %TRUE if the data could be loaded.
2647  **/
2648 gboolean
2649 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2650                                  GFile           *file,
2651                                  GError         **error)
2652 {
2653   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2654   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2655
2656   gtk_css_provider_reset (css_provider);
2657
2658   return gtk_css_provider_load_internal (css_provider, NULL, file, NULL, error);
2659 }
2660
2661 /**
2662  * gtk_css_provider_load_from_path:
2663  * @css_provider: a #GtkCssProvider
2664  * @path: the path of a filename to load, in the GLib filename encoding
2665  * @error: (out) (allow-none): return location for a #GError, or %NULL
2666  *
2667  * Loads the data contained in @path into @css_provider, making it clear
2668  * any previously loaded information.
2669  *
2670  * Returns: %TRUE if the data could be loaded.
2671  **/
2672 gboolean
2673 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2674                                  const gchar     *path,
2675                                  GError         **error)
2676 {
2677   GFile *file;
2678   gboolean result;
2679
2680   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2681   g_return_val_if_fail (path != NULL, FALSE);
2682
2683   file = g_file_new_for_path (path);
2684
2685   result = gtk_css_provider_load_from_file (css_provider, file, error);
2686
2687   g_object_unref (file);
2688
2689   return result;
2690 }
2691
2692 /**
2693  * gtk_css_provider_get_default:
2694  *
2695  * Returns the provider containing the style settings used as a
2696  * fallback for all widgets.
2697  *
2698  * Returns: (transfer none): The provider used for fallback styling.
2699  *          This memory is owned by GTK+, and you must not free it.
2700  **/
2701 GtkCssProvider *
2702 gtk_css_provider_get_default (void)
2703 {
2704   static GtkCssProvider *provider;
2705
2706   if (G_UNLIKELY (!provider))
2707     {
2708       const gchar *str =
2709         "@define-color fg_color #000; \n"
2710         "@define-color bg_color #dcdad5; \n"
2711         "@define-color text_color #000; \n"
2712         "@define-color base_color #fff; \n"
2713         "@define-color selected_bg_color #4b6983; \n"
2714         "@define-color selected_fg_color #fff; \n"
2715         "@define-color tooltip_bg_color #eee1b3; \n"
2716         "@define-color tooltip_fg_color #000; \n"
2717         "@define-color placeholder_text_color #808080; \n"
2718         "\n"
2719         "@define-color info_fg_color rgb (181, 171, 156);\n"
2720         "@define-color info_bg_color rgb (252, 252, 189);\n"
2721         "@define-color warning_fg_color rgb (173, 120, 41);\n"
2722         "@define-color warning_bg_color rgb (250, 173, 61);\n"
2723         "@define-color question_fg_color rgb (97, 122, 214);\n"
2724         "@define-color question_bg_color rgb (138, 173, 212);\n"
2725         "@define-color error_fg_color rgb (166, 38, 38);\n"
2726         "@define-color error_bg_color rgb (237, 54, 54);\n"
2727         "\n"
2728         "* {\n"
2729         "  background-color: @bg_color;\n"
2730         "  color: @fg_color;\n"
2731         "  border-color: shade (@bg_color, 0.6);\n"
2732         "  padding: 2;\n"
2733         "  border-width: 0;\n"
2734         "}\n"
2735         "\n"
2736         "*:prelight {\n"
2737         "  background-color: shade (@bg_color, 1.05);\n"
2738         "  color: shade (@fg_color, 1.3);\n"
2739         "}\n"
2740         "\n"
2741         "*:selected {\n"
2742         "  background-color: @selected_bg_color;\n"
2743         "  color: @selected_fg_color;\n"
2744         "}\n"
2745         "\n"
2746         ".expander, GtkTreeView.view.expander {\n"
2747         "  color: #fff;\n"
2748         "}\n"
2749         "\n"
2750         ".expander:prelight,\n"
2751         "GtkTreeView.view.expander:selected:prelight {\n"
2752         "  color: @text_color;\n"
2753         "}\n"
2754         "\n"
2755         ".expander:active {\n"
2756         "  transition: 200ms linear;\n"
2757         "}\n"
2758         "\n"
2759         "*:insensitive {\n"
2760         "  border-color: shade (@bg_color, 0.7);\n"
2761         "  background-color: shade (@bg_color, 0.9);\n"
2762         "  color: shade (@bg_color, 0.7);\n"
2763         "}\n"
2764         "\n"
2765         ".view {\n"
2766         "  border-width: 0;\n"
2767         "  border-radius: 0;\n"
2768         "  background-color: @base_color;\n"
2769         "  color: @text_color;\n"
2770         "}\n"
2771         ".view:selected {\n"
2772         "  background-color: shade (@bg_color, 0.9);\n"
2773         "  color: @fg_color;\n"
2774         "}\n"
2775         "\n"
2776         ".view:selected:focused {\n"
2777         "  background-color: @selected_bg_color;\n"
2778         "  color: @selected_fg_color;\n"
2779         "}\n"
2780         "\n"
2781         ".view column:sorted row,\n"
2782         ".view column:sorted row:prelight {\n"
2783         "  background-color: shade (@bg_color, 0.85);\n"
2784         "}\n"
2785         "\n"
2786         ".view column:sorted row:nth-child(odd),\n"
2787         ".view column:sorted row:nth-child(odd):prelight {\n"
2788         "  background-color: shade (@bg_color, 0.8);\n"
2789         "}\n"
2790         "\n"
2791         ".view row,\n"
2792         ".view row:prelight {\n"
2793         "  background-color: @base_color;\n"
2794         "  color: @text_color;\n"
2795         "}\n"
2796         "\n"
2797         ".view row:nth-child(odd),\n"
2798         ".view row:nth-child(odd):prelight {\n"
2799         "  background-color: shade (@base_color, 0.93); \n"
2800         "}\n"
2801         "\n"
2802         ".view row:selected:focused {\n"
2803         "  background-color: @selected_bg_color;\n"
2804         "}\n"
2805         "\n"
2806         ".view row:selected {\n"
2807         "  background-color: darker (@bg_color);\n"
2808         "  color: @selected_fg_color;\n"
2809         "}\n"
2810         "\n"
2811         ".view.cell.trough,\n"
2812         ".view.cell.trough:hover,\n"
2813         ".view.cell.trough:selected,\n"
2814         ".view.cell.trough:selected:focused {\n"
2815         "  background-color: @bg_color;\n"
2816         "  color: @fg_color;\n"
2817         "}\n"
2818         "\n"
2819         ".view.cell.progressbar,\n"
2820         ".view.cell.progressbar:hover,\n"
2821         ".view.cell.progressbar:selected,\n"
2822         ".view.cell.progressbar:selected:focused {\n"
2823         "  background-color: @selected_bg_color;\n"
2824         "  color: @selected_fg_color;\n"
2825         "}\n"
2826         "\n"
2827         ".rubberband {\n"
2828         "  background-color: alpha (@fg_color, 0.25);\n"
2829         "  border-color: @fg_color;\n"
2830         "  border-style: solid;\n"
2831         "  border-width: 1;\n"
2832         "}\n"
2833         "\n"
2834         ".tooltip,\n"
2835         ".tooltip * {\n"
2836         "  background-color: @tooltip_bg_color; \n"
2837         "  color: @tooltip_fg_color; \n"
2838         "  border-color: @tooltip_fg_color; \n"
2839         "  border-width: 1;\n"
2840         "  border-style: solid;\n"
2841         "}\n"
2842         "\n"
2843         ".button,\n"
2844         ".slider {\n"
2845         "  border-style: outset; \n"
2846         "  border-width: 2; \n"
2847         "}\n"
2848         "\n"
2849         ".button:active {\n"
2850         "  background-color: shade (@bg_color, 0.7);\n"
2851         "  border-style: inset; \n"
2852         "}\n"
2853         "\n"
2854         ".button:prelight,\n"
2855         ".slider:prelight {\n"
2856         "  background-color: @selected_bg_color;\n"
2857         "  color: @selected_fg_color;\n"
2858         "  border-color: shade (@selected_bg_color, 0.7);\n"
2859         "}\n"
2860         "\n"
2861         ".trough {\n"
2862         "  background-color: darker (@bg_color);\n"
2863         "  border-style: inset;\n"
2864         "  border-width: 1;\n"
2865         "  padding: 0;\n"
2866         "}\n"
2867         "\n"
2868         ".entry {\n"
2869         "  border-style: inset;\n"
2870         "  border-width: 2;\n"
2871         "  background-color: @base_color;\n"
2872         "  color: @text_color;\n"
2873         "}\n"
2874         "\n"
2875         ".entry:insensitive {\n"
2876         "  background-color: shade (@base_color, 0.9);\n"
2877         "  color: shade (@base_color, 0.7);\n"
2878         "}\n"
2879         ".entry:active {\n"
2880         "  background-color: #c4c2bd;\n"
2881         "  color: #000;\n"
2882         "}\n"
2883         "\n"
2884         ".progressbar,\n"
2885         ".entry.progressbar, \n"
2886         ".cell.progressbar {\n"
2887         "  background-color: @selected_bg_color;\n"
2888         "  border-color: shade (@selected_bg_color, 0.7);\n"
2889         "  color: @selected_fg_color;\n"
2890         "  border-style: outset;\n"
2891         "  border-width: 1;\n"
2892         "}\n"
2893         "\n"
2894         "GtkCheckButton:hover,\n"
2895         "GtkCheckButton:selected,\n"
2896         "GtkRadioButton:hover,\n"
2897         "GtkRadioButton:selected {\n"
2898         "  background-color: shade (@bg_color, 1.05);\n"
2899         "}\n"
2900         "\n"
2901         ".check, .radio,"
2902         ".cell.check, .cell.radio,\n"
2903         ".cell.check:hover, .cell.radio:hover {\n"
2904         "  border-style: solid;\n"
2905         "  border-width: 1;\n"
2906         "  background-color: @base_color;\n"
2907         "  border-color: @fg_color;\n"
2908         "}\n"
2909         "\n"
2910         ".check:active, .radio:active,\n"
2911         ".check:hover, .radio:hover {\n"
2912         "  background-color: @base_color;\n"
2913         "  border-color: @fg_color;\n"
2914         "  color: @text_color;\n"
2915         "}\n"
2916         "\n"
2917         ".check:selected, .radio:selected {\n"
2918         "  background-color: darker (@bg_color);\n"
2919         "  color: @selected_fg_color;\n"
2920         "  border-color: @selected_fg_color;\n"
2921         "}\n"
2922         "\n"
2923         ".check:selected:focused, .radio:selected:focused {\n"
2924         "  background-color: @selected_bg_color;\n"
2925         "}\n"
2926         "\n"
2927         ".menuitem.check, .menuitem.radio {\n"
2928         "  color: @fg_color;\n"
2929         "  border-style: none;\n"
2930         "  border-width: 0;\n"
2931         "}\n"
2932         "\n"
2933         ".popup {\n"
2934         "  border-style: outset;\n"
2935         "  border-width: 1;\n"
2936         "}\n"
2937         "\n"
2938         ".viewport {\n"
2939         "  border-style: inset;\n"
2940         "  border-width: 2;\n"
2941         "}\n"
2942         "\n"
2943         ".notebook {\n"
2944         "  border-style: outset;\n"
2945         "  border-width: 1;\n"
2946         "}\n"
2947         "\n"
2948         ".frame {\n"
2949         "  border-style: inset;\n"
2950         "  border-width: 1;\n"
2951         "}\n"
2952         "\n"
2953         "GtkScrolledWindow.frame {\n"
2954         "  padding: 0;\n"
2955         "}\n"
2956         "\n"
2957         ".menu,\n"
2958         ".menubar,\n"
2959         ".toolbar {\n"
2960         "  border-style: outset;\n"
2961         "  border-width: 1;\n"
2962         "}\n"
2963         "\n"
2964         ".menu:hover,\n"
2965         ".menubar:hover,\n"
2966         ".menuitem:hover,\n"
2967         ".menuitem.check:hover,\n"
2968         ".menuitem.radio:hover {\n"
2969         "  background-color: @selected_bg_color;\n"
2970         "  color: @selected_fg_color;\n"
2971         "}\n"
2972         "\n"
2973         "GtkSpinButton.button {\n"
2974         "  border-width: 1;\n"
2975         "}\n"
2976         "\n"
2977         ".scale.slider:hover,\n"
2978         "GtkSpinButton.button:hover {\n"
2979         "  background-color: shade (@bg_color, 1.05);\n"
2980         "  border-color: shade (@bg_color, 0.8);\n"
2981         "}\n"
2982         "\n"
2983         "GtkSwitch.trough:active {\n"
2984         "  background-color: @selected_bg_color;\n"
2985         "  color: @selected_fg_color;\n"
2986         "}\n"
2987         "\n"
2988         "GtkToggleButton.button:inconsistent {\n"
2989         "  border-style: outset;\n"
2990         "  border-width: 1px;\n"
2991         "  background-color: shade (@bg_color, 0.9);\n"
2992         "  border-color: shade (@bg_color, 0.7);\n"
2993         "}\n"
2994         "\n"
2995         "GtkLabel:selected {\n"
2996         "  background-color: shade (@bg_color, 0.9);\n"
2997         "}\n"
2998         "\n"
2999         "GtkLabel:selected:focused {\n"
3000         "  background-color: @selected_bg_color;\n"
3001         "}\n"
3002         "\n"
3003         ".spinner:active {\n"
3004         "  transition: 750ms linear loop;\n"
3005         "}\n"
3006         "\n"
3007         ".info {\n"
3008         "  background-color: @info_bg_color;\n"
3009         "  color: @info_fg_color;\n"
3010         "}\n"
3011         "\n"
3012         ".warning {\n"
3013         "  background-color: @warning_bg_color;\n"
3014         "  color: @warning_fg_color;\n"
3015         "}\n"
3016         "\n"
3017         ".question {\n"
3018         "  background-color: @question_bg_color;\n"
3019         "  color: @question_fg_color;\n"
3020         "}\n"
3021         "\n"
3022         ".error {\n"
3023         "  background-color: @error_bg_color;\n"
3024         "  color: @error_fg_color;\n"
3025         "}\n"
3026         "\n"
3027         ".highlight {\n"
3028         "  background-color: @selected_bg_color;\n"
3029         "  color: @selected_fg_color;\n"
3030         "}\n"
3031         "\n"
3032         ".light-area-focus {\n"
3033         "  color: #000;\n"
3034         "}\n"
3035         "\n"
3036         ".dark-area-focus {\n"
3037         "  color: #fff;\n"
3038         "}\n"
3039         "GtkCalendar.view {\n"
3040         "  border-width: 1;\n"
3041         "  border-style: inset;\n"
3042         "  padding: 1;\n"
3043         "}\n"
3044         "\n"
3045         "GtkCalendar.view:inconsistent {\n"
3046         "  color: darker (@bg_color);\n"
3047         "}\n"
3048         "\n"
3049         "GtkCalendar.header {\n"
3050         "  background-color: @bg_color;\n"
3051         "  border-style: outset;\n"
3052         "  border-width: 2;\n"
3053         "}\n"
3054         "\n"
3055         "GtkCalendar.highlight {\n"
3056         "  border-width: 0;\n"
3057         "}\n"
3058         "\n"
3059         "GtkCalendar.button {\n"
3060         "  background-color: @bg_color;\n"
3061         "}\n"
3062         "\n"
3063         "GtkCalendar.button:hover {\n"
3064         "  background-color: lighter (@bg_color);\n"
3065         "  color: @fg_color;\n"
3066         "}\n"
3067         "\n"
3068         ".menu * {\n"
3069         "  border-width: 0;\n"
3070         "  padding: 2;\n"
3071         "}\n"
3072         "\n";
3073
3074       provider = gtk_css_provider_new ();
3075       if (!gtk_css_provider_load_from_data (provider, str, -1, NULL))
3076         {
3077           g_error ("Failed to load the internal default CSS.");
3078         }
3079     }
3080
3081   return provider;
3082 }
3083
3084 gchar *
3085 _gtk_css_provider_get_theme_dir (void)
3086 {
3087   const gchar *var;
3088   gchar *path;
3089
3090   var = g_getenv ("GTK_DATA_PREFIX");
3091
3092   if (var)
3093     path = g_build_filename (var, "share", "themes", NULL);
3094   else
3095     path = g_build_filename (GTK_DATA_PREFIX, "share", "themes", NULL);
3096
3097   return path;
3098 }
3099
3100 /**
3101  * gtk_css_provider_get_named:
3102  * @name: A theme name
3103  * @variant: (allow-none): variant to load, for example, "dark", or
3104  *     %NULL for the default
3105  *
3106  * Loads a theme from the usual theme paths
3107  *
3108  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
3109  *     This memory is owned by GTK+, and you must not free it.
3110  */
3111 GtkCssProvider *
3112 gtk_css_provider_get_named (const gchar *name,
3113                             const gchar *variant)
3114 {
3115   static GHashTable *themes = NULL;
3116   GtkCssProvider *provider;
3117   gchar *key;
3118
3119   if (G_UNLIKELY (!themes))
3120     themes = g_hash_table_new (g_str_hash, g_str_equal);
3121
3122   if (variant == NULL)
3123     key = (gchar *)name;
3124   else
3125     key = g_strconcat (name, "-", variant, NULL);
3126
3127   provider = g_hash_table_lookup (themes, key);
3128
3129   if (!provider)
3130     {
3131       const gchar *home_dir;
3132       gchar *subpath, *path = NULL;
3133
3134       if (variant)
3135         subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
3136       else
3137         subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
3138
3139       /* First look in the users home directory
3140        */
3141       home_dir = g_get_home_dir ();
3142       if (home_dir)
3143         {
3144           path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
3145
3146           if (!g_file_test (path, G_FILE_TEST_EXISTS))
3147             {
3148               g_free (path);
3149               path = NULL;
3150             }
3151         }
3152
3153       if (!path)
3154         {
3155           gchar *theme_dir;
3156
3157           theme_dir = _gtk_css_provider_get_theme_dir ();
3158           path = g_build_filename (theme_dir, name, subpath, NULL);
3159           g_free (theme_dir);
3160
3161           if (!g_file_test (path, G_FILE_TEST_EXISTS))
3162             {
3163               g_free (path);
3164               path = NULL;
3165             }
3166         }
3167
3168       g_free (subpath);
3169
3170       if (path)
3171         {
3172           provider = gtk_css_provider_new ();
3173
3174           if (!gtk_css_provider_load_from_path (provider, path, NULL))
3175             {
3176               g_object_unref (provider);
3177               provider = NULL;
3178             }
3179           else
3180             g_hash_table_insert (themes, g_strdup (key), provider);
3181
3182           g_free (path);
3183         }
3184     }
3185
3186   if (key != name)
3187     g_free (key);
3188
3189   return provider;
3190 }
3191
3192 static int
3193 compare_properties (gconstpointer a, gconstpointer b)
3194 {
3195   return strcmp (((const GtkStyleProperty *) a)->pspec->name,
3196                  ((const GtkStyleProperty *) b)->pspec->name);
3197 }
3198
3199 static void
3200 gtk_css_ruleset_print (const GtkCssRuleset *ruleset,
3201                        GString             *str)
3202 {
3203   GList *keys, *walk;
3204
3205   _gtk_css_selector_print (ruleset->selector, str);
3206
3207   g_string_append (str, " {\n");
3208
3209   if (ruleset->style)
3210     {
3211       keys = g_hash_table_get_keys (ruleset->style);
3212       /* so the output is identical for identical selector styles */
3213       keys = g_list_sort (keys, compare_properties);
3214
3215       for (walk = keys; walk; walk = walk->next)
3216         {
3217           GtkStyleProperty *prop = walk->data;
3218           const PropertyValue *value = g_hash_table_lookup (ruleset->style, prop);
3219
3220           g_string_append (str, "  ");
3221           g_string_append (str, prop->pspec->name);
3222           g_string_append (str, ": ");
3223           _gtk_style_property_print_value (prop, &value->value, str);
3224           g_string_append (str, ";\n");
3225         }
3226
3227       g_list_free (keys);
3228     }
3229
3230   if (ruleset->widget_style)
3231     {
3232       keys = g_hash_table_get_keys (ruleset->widget_style);
3233       /* so the output is identical for identical selector styles */
3234       keys = g_list_sort (keys, (GCompareFunc) strcmp);
3235
3236       for (walk = keys; walk; walk = walk->next)
3237         {
3238           const char *name = walk->data;
3239           const PropertyValue *value = g_hash_table_lookup (ruleset->widget_style, (gpointer) name);
3240
3241           g_string_append (str, "  ");
3242           g_string_append (str, name);
3243           g_string_append (str, ": ");
3244           g_string_append (str, g_value_get_string (&value->value));
3245           g_string_append (str, ";\n");
3246         }
3247
3248       g_list_free (keys);
3249     }
3250
3251   g_string_append (str, "}\n");
3252 }
3253
3254 static void
3255 gtk_css_provider_print_colors (GHashTable *colors,
3256                                GString    *str)
3257 {
3258   GList *keys, *walk;
3259   char *s;
3260
3261   keys = g_hash_table_get_keys (colors);
3262   /* so the output is identical for identical styles */
3263   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3264
3265   for (walk = keys; walk; walk = walk->next)
3266     {
3267       const char *name = walk->data;
3268       GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
3269
3270       g_string_append (str, "@define-color ");
3271       g_string_append (str, name);
3272       g_string_append (str, " ");
3273       s = gtk_symbolic_color_to_string (symbolic);
3274       g_string_append (str, s);
3275       g_free (s);
3276       g_string_append (str, ";\n");
3277     }
3278
3279   g_list_free (keys);
3280 }
3281
3282 /**
3283  * gtk_css_provider_to_string:
3284  * @provider: the provider to write to a string
3285  *
3286  * Convertes the @provider into a string representation in CSS
3287  * format.
3288  *
3289  * Using gtk_css_provider_load_from_data() with the return value
3290  * from this function on a new provider created with
3291  * gtk_css_provider_new() will basicallu create a duplicate of
3292  * this @provider.
3293  *
3294  * Returns: a new string representing the @provider.
3295  **/
3296 char *
3297 gtk_css_provider_to_string (GtkCssProvider *provider)
3298 {
3299   GtkCssProviderPrivate *priv;
3300   GString *str;
3301   guint i;
3302
3303   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
3304
3305   priv = provider->priv;
3306
3307   str = g_string_new ("");
3308
3309   gtk_css_provider_print_colors (priv->symbolic_colors, str);
3310
3311   for (i = 0; i < priv->rulesets->len; i++)
3312     {
3313       if (i > 0)
3314         g_string_append (str, "\n");
3315       gtk_css_ruleset_print (&g_array_index (priv->rulesets, GtkCssRuleset, i), str);
3316     }
3317
3318   return g_string_free (str, FALSE);
3319 }
3320