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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "config.h"
  19
  20 #include <string.h>
  21 #include <stdlib.h>
  22
  23 #include <gdk-pixbuf/gdk-pixbuf.h>
  24 #include <cairo-gobject.h>
  25
  26 #include "gtkcssproviderprivate.h"
  27
  28 #include "gtkbitmaskprivate.h"
  29 #include "gtkcssstylefuncsprivate.h"
  30 #include "gtkcssparserprivate.h"
  31 #include "gtkcsssectionprivate.h"
  32 #include "gtkcssselectorprivate.h"
  33 #include "gtkcssshorthandpropertyprivate.h"
  34 #include "gtksymboliccolor.h"
  35 #include "gtkstyleprovider.h"
  36 #include "gtkstylecontextprivate.h"
  37 #include "gtkstylepropertiesprivate.h"
  38 #include "gtkstylepropertyprivate.h"
  39 #include "gtkstyleproviderprivate.h"
  40 #include "gtkbindings.h"
  41 #include "gtkmarshalers.h"
  42 #include "gtkprivate.h"
  43 #include "gtkintl.h"
  44
  45 /**
  46  * SECTION:gtkcssprovider
  47  * @Short_description: CSS-like styling for widgets
  48  * @Title: GtkCssProvider
  49  * @See_also: #GtkStyleContext, #GtkStyleProvider
  50  *
  51  * GtkCssProvider is an object implementing the #GtkStyleProvider interface.
  52  * It is able to parse <ulink url="http://www.w3.org/TR/CSS2">CSS</ulink>-like
  53  * input in order to style widgets.
  54  *
  55  * <refsect2 id="gtkcssprovider-files">
  56  * <title>Default files</title>
  57  * <para>
  58  * An application can cause GTK+ to parse a specific CSS style sheet by
  59  * calling gtk_css_provider_load_from_file() and adding the provider with
  60  * gtk_style_context_add_provider() or gtk_style_context_add_provider_for_screen().
  61  * In addition, certain files will be read when GTK+ is initialized. First,
  62  * the file <filename><envar>$XDG_CONFIG_HOME</envar>/gtk-3.0/gtk.css</filename>
  63  * is loaded if it exists. Then, GTK+ tries to load
  64  * <filename><envar>$HOME</envar>/.themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  65  * falling back to
  66  * <filename><replaceable>datadir</replaceable>/share/themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  67  * where <replaceable>theme-name</replaceable> is the name of the current theme
  68  * (see the #GtkSettings:gtk-theme-name setting) and <replaceable>datadir</replaceable>
  69  * is the prefix configured when GTK+ was compiled, unless overridden by the
  70  * <envar>GTK_DATA_PREFIX</envar> environment variable.
  71  * </para>
  72  * </refsect2>
  73  * <refsect2 id="gtkcssprovider-stylesheets">
  74  * <title>Style sheets</title>
  75  * <para>
  76  * The basic structure of the style sheets understood by this provider is
  77  * a series of statements, which are either rule sets or '@-rules', separated
  78  * by whitespace.
  79  * </para>
  80  * <para>
  81  * A rule set consists of a selector and a declaration block, which is
  82  * a series of declarations enclosed in curly braces ({ and }). The
  83  * declarations are separated by semicolons (;). Multiple selectors can
  84  * share the same declaration block, by putting all the separators in
  85  * front of the block, separated by commas.
  86  * </para>
  87  * <example><title>A rule set with two selectors</title>
  88  * <programlisting language="text">
  89  * GtkButton, GtkEntry {
  90  *     color: &num;ff00ea;
  91  *     font: Comic Sans 12
  92  * }
  93  * </programlisting>
  94  * </example>
  95  * </refsect2>
  96  * <refsect2 id="gtkcssprovider-selectors">
  97  * <title>Selectors</title>
  98  * <para>
  99  * Selectors work very similar to the way they do in CSS, with widget class
 100  * names taking the role of element names, and widget names taking the role
 101  * of IDs. When used in a selector, widget names must be prefixed with a
 102  * '&num;' character. The '*' character represents the so-called universal
 103  * selector, which matches any widget.
 104  * </para>
 105  * <para>
 106  * To express more complicated situations, selectors can be combined in
 107  * various ways:
 108  * <itemizedlist>
 109  * <listitem><para>To require that a widget satisfies several conditions,
 110  *   combine several selectors into one by concatenating them. E.g.
 111  *   <literal>GtkButton&num;button1</literal> matches a GtkButton widget
 112  *   with the name button1.</para></listitem>
 113  * <listitem><para>To only match a widget when it occurs inside some other
 114  *   widget, write the two selectors after each other, separated by whitespace.
 115  *   E.g. <literal>GtkToolBar GtkButton</literal> matches GtkButton widgets
 116  *   that occur inside a GtkToolBar.</para></listitem>
 117  * <listitem><para>In the previous example, the GtkButton is matched even
 118  *   if it occurs deeply nested inside the toolbar. To restrict the match
 119  *   to direct children of the parent widget, insert a '>' character between
 120  *   the two selectors. E.g. <literal>GtkNotebook > GtkLabel</literal> matches
 121  *   GtkLabel widgets that are direct children of a GtkNotebook.</para></listitem>
 122  * </itemizedlist>
 123  * </para>
 124  * <example>
 125  * <title>Widget classes and names in selectors</title>
 126  * <programlisting language="text">
 127  * /&ast; Theme labels that are descendants of a window &ast;/
 128  * GtkWindow GtkLabel {
 129  *     background-color: &num;898989
 130  * }
 131  *
 132  * /&ast; Theme notebooks, and anything that's within these &ast;/
 133  * GtkNotebook {
 134  *     background-color: &num;a939f0
 135  * }
 136  *
 137  * /&ast; Theme combo boxes, and entries that
 138  *  are direct children of a notebook &ast;/
 139  * GtkComboBox,
 140  * GtkNotebook > GtkEntry {
 141  *     color: @fg_color;
 142  *     background-color: &num;1209a2
 143  * }
 144  *
 145  * /&ast; Theme any widget within a GtkBin &ast;/
 146  * GtkBin * {
 147  *     font: Sans 20
 148  * }
 149  *
 150  * /&ast; Theme a label named title-label &ast;/
 151  * GtkLabel&num;title-label {
 152  *     font: Sans 15
 153  * }
 154  *
 155  * /&ast; Theme any widget named main-entry &ast;/
 156  * &num;main-entry {
 157  *     background-color: &num;f0a810
 158  * }
 159  * </programlisting>
 160  * </example>
 161  * <para>
 162  * Widgets may also define style classes, which can be used for matching.
 163  * When used in a selector, style classes must be prefixed with a '.'
 164  * character.
 165  * </para>
 166  * <para>
 167  * Refer to the documentation of individual widgets to learn which
 168  * style classes they define and see <xref linkend="gtkstylecontext-classes"/>
 169  * for a list of all style classes used by GTK+ widgets.
 170  * </para>
 171  * <para>
 172  * Note that there is some ambiguity in the selector syntax when it comes
 173  * to differentiation widget class names from regions. GTK+ currently treats
 174  * a string as a widget class name if it contains any uppercase characters
 175  * (which should work for more widgets with names like GtkLabel).
 176  * </para>
 177  * <example>
 178  * <title>Style classes in selectors</title>
 179  * <programlisting language="text">
 180  * /&ast; Theme all widgets defining the class entry &ast;/
 181  * .entry {
 182  *     color: &num;39f1f9;
 183  * }
 184  *
 185  * /&ast; Theme spinbuttons' entry &ast;/
 186  * GtkSpinButton.entry {
 187  *     color: &num;900185
 188  * }
 189  * </programlisting>
 190  * </example>
 191  * <para>
 192  * In complicated widgets like e.g. a GtkNotebook, it may be desirable
 193  * to style different parts of the widget differently. To make this
 194  * possible, container widgets may define regions, whose names
 195  * may be used for matching in selectors.
 196  * </para>
 197  * <para>
 198  * Some containers allow to further differentiate between regions by
 199  * applying so-called pseudo-classes to the region. For example, the
 200  * tab region in GtkNotebook allows to single out the first or last
 201  * tab by using the :first-child or :last-child pseudo-class.
 202  * When used in selectors, pseudo-classes must be prefixed with a
 203  * ':' character.
 204  * </para>
 205  * <para>
 206  * Refer to the documentation of individual widgets to learn which
 207  * regions and pseudo-classes they define and see
 208  * <xref linkend="gtkstylecontext-classes"/> for a list of all regions
 209  * used by GTK+ widgets.
 210  * </para>
 211  * <example>
 212  * <title>Regions in selectors</title>
 213  * <programlisting language="text">
 214  * /&ast; Theme any label within a notebook &ast;/
 215  * GtkNotebook GtkLabel {
 216  *     color: &num;f90192;
 217  * }
 218  *
 219  * /&ast; Theme labels within notebook tabs &ast;/
 220  * GtkNotebook tab GtkLabel {
 221  *     color: &num;703910;
 222  * }
 223  *
 224  * /&ast; Theme labels in the any first notebook
 225  *  tab, both selectors are equivalent &ast;/
 226  * GtkNotebook tab:nth-child(first) GtkLabel,
 227  * GtkNotebook tab:first-child GtkLabel {
 228  *     color: &num;89d012;
 229  * }
 230  * </programlisting>
 231  * </example>
 232  * <para>
 233  * Another use of pseudo-classes is to match widgets depending on their
 234  * state. This is conceptually similar to the :hover, :active or :focus
 235  * pseudo-classes in CSS. The available pseudo-classes for widget states
 236  * are :active, :prelight (or :hover), :insensitive, :selected, :focused
 237  * and :inconsistent.
 238  * </para>
 239  * <example>
 240  * <title>Styling specific widget states</title>
 241  * <programlisting language="text">
 242  * /&ast; Theme active (pressed) buttons &ast;/
 243  * GtkButton:active {
 244  *     background-color: &num;0274d9;
 245  * }
 246  *
 247  * /&ast; Theme buttons with the mouse pointer on it,
 248  *    both are equivalent &ast;/
 249  * GtkButton:hover,
 250  * GtkButton:prelight {
 251  *     background-color: &num;3085a9;
 252  * }
 253  *
 254  * /&ast; Theme insensitive widgets, both are equivalent &ast;/
 255  * :insensitive,
 256  * *:insensitive {
 257  *     background-color: &num;320a91;
 258  * }
 259  *
 260  * /&ast; Theme selection colors in entries &ast;/
 261  * GtkEntry:selected {
 262  *     background-color: &num;56f9a0;
 263  * }
 264  *
 265  * /&ast; Theme focused labels &ast;/
 266  * GtkLabel:focused {
 267  *     background-color: &num;b4940f;
 268  * }
 269  *
 270  * /&ast; Theme inconsistent checkbuttons &ast;/
 271  * GtkCheckButton:inconsistent {
 272  *     background-color: &num;20395a;
 273  * }
 274  * </programlisting>
 275  * </example>
 276  * <para>
 277  * Widget state pseudoclasses may only apply to the last element
 278  * in a selector.
 279  * </para>
 280  * <para>
 281  * To determine the effective style for a widget, all the matching rule
 282  * sets are merged. As in CSS, rules apply by specificity, so the rules
 283  * whose selectors more closely match a widget path will take precedence
 284  * over the others.
 285  * </para>
 286  * </refsect2>
 287  * <refsect2 id="gtkcssprovider-rules">
 288  * <title>&commat; Rules</title>
 289  * <para>
 290  * GTK+'s CSS supports the &commat;import rule, in order to load another
 291  * CSS style sheet in addition to the currently parsed one.
 292  * </para>
 293  * <example>
 294  * <title>Using the &commat;import rule</title>
 295  * <programlisting language="text">
 296  * &commat;import url ("path/to/common.css");
 297  * </programlisting>
 298  * </example>
 299  * <para id="css-binding-set">
 300  * In order to extend key bindings affecting different widgets, GTK+
 301  * supports the &commat;binding-set rule to parse a set of bind/unbind
 302  * directives, see #GtkBindingSet for the supported syntax. Note that
 303  * the binding sets defined in this way must be associated with rule sets
 304  * by setting the gtk-key-bindings style property.
 305  * </para>
 306  * <para>
 307  * Customized key bindings are typically defined in a separate
 308  * <filename>gtk-keys.css</filename> CSS file and GTK+ loads this file
 309  * according to the current key theme, which is defined by the
 310  * #GtkSettings:gtk-key-theme-name setting.
 311  * </para>
 312  * <example>
 313  * <title>Using the &commat;binding rule</title>
 314  * <programlisting language="text">
 315  * &commat;binding-set binding-set1 {
 316  *   bind "&lt;alt&gt;Left" { "move-cursor" (visual-positions, -3, 0) };
 317  *   unbind "End";
 318  * };
 319  *
 320  * &commat;binding-set binding-set2 {
 321  *   bind "&lt;alt&gt;Right" { "move-cursor" (visual-positions, 3, 0) };
 322  *   bind "&lt;alt&gt;KP_space" { "delete-from-cursor" (whitespace, 1)
 323  *                          "insert-at-cursor" (" ") };
 324  * };
 325  *
 326  * GtkEntry {
 327  *   gtk-key-bindings: binding-set1, binding-set2;
 328  * }
 329  * </programlisting>
 330  * </example>
 331  * <para>
 332  * GTK+ also supports an additional &commat;define-color rule, in order
 333  * to define a color name which may be used instead of color numeric
 334  * representations. Also see the #GtkSettings:gtk-color-scheme setting
 335  * for a way to override the values of these named colors.
 336  * </para>
 337  * <example>
 338  * <title>Defining colors</title>
 339  * <programlisting language="text">
 340  * &commat;define-color bg_color &num;f9a039;
 341  *
 342  * &ast; {
 343  *     background-color: &commat;bg_color;
 344  * }
 345  * </programlisting>
 346  * </example>
 347  * </refsect2>
 348  * <refsect2 id="gtkcssprovider-symbolic-colors">
 349  * <title>Symbolic colors</title>
 350  * <para>
 351  * Besides being able to define color names, the CSS parser is also able
 352  * to read different color expressions, which can also be nested, providing
 353  * a rich language to define colors which are derived from a set of base
 354  * colors.
 355  * </para>
 356  * <example>
 357  * <title>Using symbolic colors</title>
 358  * <programlisting language="text">
 359  * &commat;define-color entry-color shade (&commat;bg_color, 0.7);
 360  *
 361  * GtkEntry {
 362  *     background-color: @entry-color;
 363  * }
 364  *
 365  * GtkEntry:focused {
 366  *     background-color: mix (&commat;entry-color,
 367  *                            shade (&num;fff, 0.5),
 368  *                            0.8);
 369  * }
 370  * </programlisting>
 371  * </example>
 372  * <para>
 373  *   The various ways to express colors in GTK+ CSS are:
 374  * </para>
 375  * <informaltable>
 376  *   <tgroup cols="3">
 377  *     <thead>
 378  *       <row>
 379  *         <entry>Syntax</entry>
 380  *         <entry>Explanation</entry>
 381  *         <entry>Examples</entry>
 382  *       </row>
 383  *     </thead>
 384  *     <tbody>
 385  *       <row>
 386  *         <entry>rgb(@r, @g, @b)</entry>
 387  *         <entry>An opaque color; @r, @g, @b can be either integers between
 388  *                0 and 255 or percentages</entry>
 389  *         <entry><literallayout>rgb(128, 10, 54)
 390  * rgb(20%, 30%, 0%)</literallayout></entry>
 391  *       </row>
 392  *       <row>
 393  *         <entry>rgba(@r, @g, @b, @a)</entry>
 394  *         <entry>A translucent color; @r, @g, @b are as in the previous row,
 395  *                @a is a floating point number between 0 and 1</entry>
 396  *         <entry><literallayout>rgba(255, 255, 0, 0.5)</literallayout></entry>
 397  *       </row>
 398  *       <row>
 399  *         <entry>&num;@xxyyzz</entry>
 400  *         <entry>An opaque color; @xx, @yy, @zz are hexadecimal numbers
 401  *                specifying @r, @g, @b variants with between 1 and 4
 402  *                hexadecimal digits per component are allowed</entry>
 403  *         <entry><literallayout>&num;ff12ab
 404  * &num;f0c</literallayout></entry>
 405  *       </row>
 406  *       <row>
 407  *         <entry>&commat;name</entry>
 408  *         <entry>Reference to a color that has been defined with
 409  *                &commat;define-color
 410  *         </entry>
 411  *         <entry>&commat;bg_color</entry>
 412  *       </row>
 413  *       <row>
 414  *         <entry>mix(@color1, @color2, @f)</entry>
 415  *         <entry>A linear combination of @color1 and @color2. @f is a
 416  *                floating point number between 0 and 1.</entry>
 417  *         <entry><literallayout>mix(&num;ff1e0a, &commat;bg_color, 0.8)</literallayout></entry>
 418  *       </row>
 419  *       <row>
 420  *         <entry>shade(@color, @f)</entry>
 421  *         <entry>A lighter or darker variant of @color. @f is a
 422  *                floating point number.
 423  *         </entry>
 424  *         <entry>shade(&commat;fg_color, 0.5)</entry>
 425  *       </row>
 426  *       <row>
 427  *         <entry>lighter(@color)</entry>
 428  *         <entry>A lighter variant of @color</entry>
 429  *       </row>
 430  *       <row>
 431  *         <entry>darker(@color)</entry>
 432  *         <entry>A darker variant of @color</entry>
 433  *       </row>
 434  *       <row>
 435  *         <entry>alpha(@color, @f)</entry>
 436  *         <entry>Modifies passed color's alpha by a factor @f. @f is a
 437  *                floating point number. @f < 1.0 results in a more transparent
 438  *                color while @f > 1.0 results in a more opaque color.
 439  *         </entry>
 440  *         <entry>alhpa(blue, 0.5)</entry>
 441  *       </row>
 442  *     </tbody>
 443  *   </tgroup>
 444  * </informaltable>
 445  * </refsect2>
 446  * <refsect2 id="gtkcssprovider-gradients">
 447  * <title>Gradients</title>
 448  * <para>
 449  * Linear or radial Gradients can be used as background images.
 450  * </para>
 451  * <para>
 452  * A linear gradient along the line from (@start_x, @start_y) to
 453  * (@end_x, @end_y) is specified using the syntax
 454  * <literallayout>-gtk-gradient (linear,
 455  *               @start_x @start_y, @end_x @end_y,
 456  *               color-stop (@position, @color),
 457  *               ...)</literallayout>
 458  * where @start_x and @end_x can be either a floating point number between
 459  * 0 and 1 or one of the special values 'left', 'right' or 'center', @start_y
 460  * and @end_y can be either a floating point number between 0 and 1 or one
 461  * of the special values 'top', 'bottom' or 'center', @position is a floating
 462  * point number between 0 and 1 and @color is a color expression (see above).
 463  * The color-stop can be repeated multiple times to add more than one color
 464  * stop. 'from (@color)' and 'to (@color)' can be used as abbreviations for
 465  * color stops with position 0 and 1, respectively.
 466  * </para>
 467  * <example>
 468  * <title>A linear gradient</title>
 469  * <inlinegraphic fileref="gradient1.png" format="PNG"/>
 470  * <para>This gradient was specified with
 471  * <literallayout>-gtk-gradient (linear,
 472  *                left top, right bottom,
 473  *                from(&commat;yellow), to(&commat;blue))</literallayout></para>
 474  * </example>
 475  * <example>
 476  * <title>Another linear gradient</title>
 477  * <inlinegraphic fileref="gradient2.png" format="PNG"/>
 478  * <para>This gradient was specified with
 479  * <literallayout>-gtk-gradient (linear,
 480  *                0 0, 0 1,
 481  *                color-stop(0, &commat;yellow),
 482  *                color-stop(0.2, &commat;blue),
 483  *                color-stop(1, &num;0f0))</literallayout></para>
 484  * </example>
 485  * <para>
 486  * A radial gradient along the two circles defined by (@start_x, @start_y,
 487  * @start_radius) and (@end_x, @end_y, @end_radius) is specified using the
 488  * syntax
 489  * <literallayout>-gtk-gradient (radial,
 490  *                @start_x @start_y, @start_radius,
 491  *                @end_x @end_y, @end_radius,
 492  *                color-stop (@position, @color),
 493  *                ...)</literallayout>
 494  * where @start_radius and @end_radius are floating point numbers and
 495  * the other parameters are as before.
 496  * </para>
 497  * <example>
 498  * <title>A radial gradient</title>
 499  * <inlinegraphic fileref="gradient3.png" format="PNG"/>
 500  * <para>This gradient was specified with
 501  * <literallayout>-gtk-gradient (radial,
 502  *                center center, 0,
 503  *                center center, 1,
 504  *                from(&commat;yellow), to(&commat;green))</literallayout></para>
 505  * </example>
 506  * <example>
 507  * <title>Another radial gradient</title>
 508  * <inlinegraphic fileref="gradient4.png" format="PNG"/>
 509  * <para>This gradient was specified with
 510  * <literallayout>-gtk-gradient (radial,
 511  *                0.4 0.4, 0.1,
 512  *                0.6 0.6, 0.7,
 513  *                color-stop (0, &num;f00),
 514  *                color-stop (0.1, &num;a0f),
 515  *                color-stop (0.2, &commat;yellow),
 516  *                color-stop (1, &commat;green))</literallayout></para>
 517  * </example>
 518  * </refsect2>
 519  * <refsect2 id="gtkcssprovider-shadows">
 520  * <title>Text shadow</title>
 521  * <para>
 522  * A shadow list can be applied to text or symbolic icons, using the CSS3
 523  * text-shadow syntax, as defined in
 524  * <ulink url="http://www.w3.org/TR/css3-text/#text-shadow">the CSS3 specification</ulink>.
 525  * </para>
 526  * <para>
 527  * A text shadow is specified using the syntax
 528  * <literallayout>text-shadow: @horizontal_offset @vertical_offset [ @blur_radius ] @color</literallayout>
 529  * The offset of the shadow is specified with the @horizontal_offset and @vertical_offset
 530  * parameters. The optional blur radius is parsed, but it is currently not rendered by
 531  * the GTK+ theming engine.
 532  * </para>
 533  * <para>
 534  * To set multiple shadows on an element, you can specify a comma-separated list
 535  * of shadow elements in the text-shadow property. Shadows are always rendered
 536  * front-back, i.e. the first shadow specified is on top of the others. Shadows
 537  * can thus overlay each other, but they can never overlay the text itself,
 538  * which is always rendered on top of the shadow layer.
 539  * </para>
 540  * </refsect2>
 541  * <refsect2>
 542  * <title>Box shadow</title>
 543  * <para>
 544  * Themes can apply shadows on framed elements using the CSS3 box-shadow syntax,
 545  * as defined in
 546  * <ulink url="http://www.w3.org/TR/css3-background/#the-box-shadow">the CSS3 specification</ulink>.
 547  * </para>
 548  * <para>
 549  * A box shadow is specified using the syntax
 550  * <literallayout>box-shadow: [ @inset ] @horizontal_offset @vertical_offset [ @blur_radius ] [ @spread ] @color</literallayout>
 551  * A positive offset will draw a shadow that is offset to the right (down) of the box,
 552  * a negative offset to the left (top). The optional spread parameter defines an additional
 553  * distance to expand the shadow shape in all directions, by the specified radius.
 554  * The optional blur radius parameter is parsed, but it is currently not rendered by
 555  * the GTK+ theming engine.
 556  * The inset parameter defines whether the drop shadow should be rendered inside or outside
 557  * the box canvas. Only inset box-shadows are currently supported by the GTK+ theming engine,
 558  * non-inset elements are currently ignored.
 559  * </para>
 560  * <para>
 561  * To set multiple box-shadows on an element, you can specify a comma-separated list
 562  * of shadow elements in the box-shadow property. Shadows are always rendered
 563  * front-back, i.e. the first shadow specified is on top of the others, so they may
 564  * overlap other boxes or other shadows.
 565  * </para>
 566  * </refsect2>
 567  * <refsect2 id="gtkcssprovider-border-image">
 568  * <title>Border images</title>
 569  * <para>
 570  * Images and gradients can also be used in slices for the purpose of creating
 571  * scalable borders.
 572  * For more information, see the CSS3 documentation for the border-image property,
 573  * which can be found <ulink url="http://www.w3.org/TR/css3-background/#border-images">here</ulink>.
 574  * </para>
 575  * <inlinegraphic fileref="slices.png" format="PNG"/>
 576  * <para>
 577  * The parameters of the slicing process are controlled by
 578  * four separate properties. Note that you can use the
 579  * <literallayout>border-image</literallayout> shorthand property
 580  * to set values for the three properties at the same time.
 581  * </para>
 582  * <para>
 583  * <literallayout>border-image-source: url(@path)
 584  * (or border-image-source: -gtk-gradient(...))</literallayout>:
 585  * Specifies the source of the border image, and it can either
 586  * be an URL or a gradient (see above).
 587  * </para>
 588  * <para>
 589  * <literallayout>border-image-slice: @top @right @bottom @left</literallayout>
 590  * The sizes specified by the @top, @right, @bottom and @left parameters
 591  * are the offsets, in pixels, from the relevant edge where the image
 592  * should be "cut off" to build the slices used for the rendering
 593  * of the border.
 594  * </para>
 595  * <para>
 596  * <literallayout>border-image-width: @top @right @bottom @left</literallayout>
 597  * The sizes specified by the @top, @right, @bottom and @left parameters
 598  * are inward distances from the border box edge, used to specify the
 599  * rendered size of each slice determined by border-image-slice.
 600  * If this property is not specified, the values of border-width will
 601  * be used as a fallback.
 602  * </para>
 603  * <para>
 604  * <literallayout>border-image-repeat: [stretch|repeat|round|space] ?
 605  * [stretch|repeat|round|space]</literallayout>
 606  * Specifies how the image slices should be rendered in the area
 607  * outlined by border-width.
 608  * The default (stretch) is to resize the slice to fill in the whole
 609  * allocated area.
 610  * If the value of this property is 'repeat', the image slice
 611  * will be tiled to fill the area.
 612  * If the value of this property is 'round', the image slice will
 613  * be tiled to fill the area, and scaled to fit it exactly
 614  * a whole number of times.
 615  * If the value of this property is 'space', the image slice will
 616  * be tiled to fill the area, and if it doesn't fit it exactly a whole
 617  * number of times, the extra space is distributed as padding around
 618  * the slices.
 619  * If two options are specified, the first one affects
 620  * the horizontal behaviour and the second one the vertical behaviour.
 621  * If only one option is specified, it affects both.
 622  * </para>
 623  * <example>
 624  * <title>A border image</title>
 625  * <inlinegraphic fileref="border1.png" format="PNG"/>
 626  * <para>This border image was specified with
 627  * <literallayout>url("gradient1.png") 10 10 10 10</literallayout>
 628  * </para>
 629  * </example>
 630  * <example>
 631  * <title>A repeating border image</title>
 632  * <inlinegraphic fileref="border2.png" format="PNG"/>
 633  * <para>This border image was specified with
 634  * <literallayout>url("gradient1.png") 10 10 10 10 repeat</literallayout>
 635  * </para>
 636  * </example>
 637  * <example>
 638  * <title>A stretched border image</title>
 639  * <inlinegraphic fileref="border3.png" format="PNG"/>
 640  * <para>This border image was specified with
 641  * <literallayout>url("gradient1.png") 10 10 10 10 stretch</literallayout>
 642  * </para>
 643  * </example>
 644  * </refsect2>
 645  * <refsect2 id="gtkcssprovider-transitions">
 646  * <para>Styles can specify transitions that will be used to create a gradual
 647  * change in the appearance when a widget state changes. The following
 648  * syntax is used to specify transitions:
 649  * <literallayout>@duration [s|ms] [linear|ease|ease-in|ease-out|ease-in-out] [loop]?</literallayout>
 650  * The @duration is the amount of time that the animation will take for
 651  * a complete cycle from start to end. If the loop option is given, the
 652  * animation will be repated until the state changes again.
 653  * The option after the duration determines the transition function from a
 654  * small set of predefined functions.
 655  * <figure><title>Linear transition</title>
 656  * <graphic fileref="linear.png" format="PNG"/>
 657  * </figure>
 658  * <figure><title>Ease transition</title>
 659  * <graphic fileref="ease.png" format="PNG"/>
 660  * </figure>
 661  * <figure><title>Ease-in-out transition</title>
 662  * <graphic fileref="ease-in-out.png" format="PNG"/>
 663  * </figure>
 664  * <figure><title>Ease-in transition</title>
 665  * <graphic fileref="ease-in.png" format="PNG"/>
 666  * </figure>
 667  * <figure><title>Ease-out transition</title>
 668  * <graphic fileref="ease-out.png" format="PNG"/>
 669  * </figure>
 670  * </para>
 671  * </refsect2>
 672  * <refsect2 id="gtkcssprovider-properties">
 673  * <title>Supported properties</title>
 674  * <para>
 675  * Properties are the part that differ the most to common CSS,
 676  * not all properties are supported (some are planned to be
 677  * supported eventually, some others are meaningless or don't
 678  * map intuitively in a widget based environment).
 679  * </para>
 680  * <para>
 681  * The currently supported properties are:
 682  * </para>
 683  * <informaltable>
 684  *   <tgroup cols="4">
 685  *     <thead>
 686  *       <row>
 687  *         <entry>Property name</entry>
 688  *         <entry>Syntax</entry>
 689  *         <entry>Maps to</entry>
 690  *         <entry>Examples</entry>
 691  *       </row>
 692  *     </thead>
 693  *     <tbody>
 694  *       <row>
 695  *         <entry>engine</entry>
 696  *         <entry>engine-name</entry>
 697  *         <entry>#GtkThemingEngine</entry>
 698  *         <entry>engine: clearlooks;
 699  *  engine: none; /&ast; use the default (i.e. builtin) engine) &ast;/ </entry>
 700  *       </row>
 701  *       <row>
 702  *         <entry>background-color</entry>
 703  *         <entry morerows="2">color (see above)</entry>
 704  *         <entry morerows="7">#GdkRGBA</entry>
 705  *         <entry morerows="7"><literallayout>background-color: &num;fff;
 706  * color: &amp;color1;
 707  * background-color: shade (&amp;color1, 0.5);
 708  * color: mix (&amp;color1, &num;f0f, 0.8);</literallayout>
 709  *         </entry>
 710  *       </row>
 711  *       <row>
 712  *         <entry>color</entry>
 713  *       </row>
 714  *       <row>
 715  *         <entry>border-top-color</entry>
 716  *         <entry morerows="4">transparent|color (see above)</entry>
 717  *       </row>
 718  *       <row>
 719  *         <entry>border-right-color</entry>
 720  *       </row>
 721  *       <row>
 722  *         <entry>border-bottom-color</entry>
 723  *       </row>
 724  *       <row>
 725  *         <entry>border-left-color</entry>
 726  *       </row>
 727  *       <row>
 728  *         <entry>border-color</entry>
 729  *         <entry>[transparent|color]{1,4}</entry>
 730  *       </row>
 731  *       <row>
 732  *         <entry>font-family</entry>
 733  *         <entry>@family [, @family]*</entry>
 734  *         <entry>#gchararray</entry>
 735  *         <entry>font-family: Sans, Arial;</entry>
 736  *       </row>
 737  *       <row>
 738  *         <entry>font-style</entry>
 739  *         <entry>[normal|oblique|italic]</entry>
 740  *         <entry>#PANGO_TYPE_STYLE</entry>
 741  *         <entry>font-style: italic;</entry>
 742  *       </row>
 743  *       <row>
 744  *         <entry>font-variant</entry>
 745  *         <entry>[normal|small-caps]</entry>
 746  *         <entry>#PANGO_TYPE_VARIANT</entry>
 747  *         <entry>font-variant: normal;</entry>
 748  *       </row>
 749  *       <row>
 750  *         <entry>font-weight</entry>
 751  *         <entry>[normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900]</entry>
 752  *         <entry>#PANGO_TYPE_WEIGHT</entry>
 753  *         <entry>font-weight: bold;</entry>
 754  *       </row>
 755  *       <row>
 756  *         <entry>font-size</entry>
 757  *         <entry>Font size in point</entry>
 758  *         <entry>#gint</entry>
 759  *         <entry>font-size: 13;</entry>
 760  *       </row>
 761  *       <row>
 762  *         <entry>font</entry>
 763  *         <entry>@family [@style] [@size]</entry>
 764  *         <entry>#PangoFontDescription</entry>
 765  *         <entry>font: Sans 15;</entry>
 766  *       </row>
 767  *       <row>
 768  *         <entry>margin-top</entry>
 769  *         <entry>integer</entry>
 770  *         <entry>#gint</entry>
 771  *         <entry>margin-top: 0;</entry>
 772  *       </row>
 773  *       <row>
 774  *         <entry>margin-left</entry>
 775  *         <entry>integer</entry>
 776  *         <entry>#gint</entry>
 777  *         <entry>margin-left: 1;</entry>
 778  *       </row>
 779  *       <row>
 780  *         <entry>margin-bottom</entry>
 781  *         <entry>integer</entry>
 782  *         <entry>#gint</entry>
 783  *         <entry>margin-bottom: 2;</entry>
 784  *       </row>
 785  *       <row>
 786  *         <entry>margin-right</entry>
 787  *         <entry>integer</entry>
 788  *         <entry>#gint</entry>
 789  *         <entry>margin-right: 4;</entry>
 790  *       </row>
 791  *       <row>
 792  *         <entry>margin</entry>
 793  *         <entry morerows="1"><literallayout>@width
 794  * @vertical_width @horizontal_width
 795  * @top_width @horizontal_width @bottom_width
 796  * @top_width @right_width @bottom_width @left_width</literallayout>
 797  *         </entry>
 798  *         <entry morerows="1">#GtkBorder</entry>
 799  *         <entry morerows="1"><literallayout>margin: 5;
 800  * margin: 5 10;
 801  * margin: 5 10 3;
 802  * margin: 5 10 3 5;</literallayout>
 803  *         </entry>
 804  *       </row>
 805  *       <row>
 806  *         <entry>padding-top</entry>
 807  *         <entry>integer</entry>
 808  *         <entry>#gint</entry>
 809  *         <entry>padding-top: 5;</entry>
 810  *       </row>
 811  *       <row>
 812  *         <entry>padding-left</entry>
 813  *         <entry>integer</entry>
 814  *         <entry>#gint</entry>
 815  *         <entry>padding-left: 5;</entry>
 816  *       </row>
 817  *       <row>
 818  *         <entry>padding-bottom</entry>
 819  *         <entry>integer</entry>
 820  *         <entry>#gint</entry>
 821  *         <entry>padding-bottom: 5;</entry>
 822  *       </row>
 823  *       <row>
 824  *         <entry>padding-right</entry>
 825  *         <entry>integer</entry>
 826  *         <entry>#gint</entry>
 827  *         <entry>padding-right: 5;</entry>
 828  *       </row>
 829  *       <row>
 830  *         <entry>padding</entry>
 831  *       </row>
 832  *       <row>
 833  *         <entry>background-image</entry>
 834  *         <entry><literallayout>gradient (see above) or
 835  * url(@path)</literallayout></entry>
 836  *         <entry>#cairo_pattern_t</entry>
 837  *         <entry><literallayout>-gtk-gradient (linear,
 838  *                left top, right top,
 839  *                from (&num;fff), to (&num;000));
 840  * -gtk-gradient (linear, 0.0 0.5, 0.5 1.0,
 841  *                from (&num;fff),
 842  *                color-stop (0.5, &num;f00),
 843  *                to (&num;000));
 844  * -gtk-gradient (radial,
 845  *                center center, 0.2,
 846  *                center center, 0.8,
 847  *                color-stop (0.0, &num;fff),
 848  *                color-stop (1.0, &num;000));
 849  * url ('background.png');</literallayout>
 850  *         </entry>
 851  *       </row>
 852  *       <row>
 853  *         <entry>background-repeat</entry>
 854  *         <entry>[repeat|no-repeat]</entry>
 855  *         <entry>internal</entry>
 856  *         <entry><literallayout>background-repeat: no-repeat;</literallayout>
 857  *                If not specified, the style doesn't respect the CSS3
 858  *                specification, since the background will be
 859  *                stretched to fill the area.
 860  *         </entry>
 861  *       </row>
 862  *       <row>
 863  *         <entry>border-top-width</entry>
 864  *         <entry>integer</entry>
 865  *         <entry>#gint</entry>
 866  *         <entry>border-top-width: 5;</entry>
 867  *       </row>
 868  *       <row>
 869  *         <entry>border-left-width</entry>
 870  *         <entry>integer</entry>
 871  *         <entry>#gint</entry>
 872  *         <entry>border-left-width: 5;</entry>
 873  *       </row>
 874  *       <row>
 875  *         <entry>border-bottom-width</entry>
 876  *         <entry>integer</entry>
 877  *         <entry>#gint</entry>
 878  *         <entry>border-bottom-width: 5;</entry>
 879  *       </row>
 880  *       <row>
 881  *         <entry>border-right-width</entry>
 882  *         <entry>integer</entry>
 883  *         <entry>#gint</entry>
 884  *         <entry>border-right-width: 5;</entry>
 885  *       </row>
 886  *       <row>
 887  *         <entry>border-width</entry>
 888  *         <entry morerows="1">#GtkBorder</entry>
 889  *         <entry morerows="1"><literallayout>border-width: 1;
 890  * border-width: 1 2;
 891  * border-width: 1 2 3;
 892  * border-width: 1 2 3 5;</literallayout>
 893  *         </entry>
 894  *       </row>
 895  *       <row>
 896  *         <entry>border-radius</entry>
 897  *         <entry>integer</entry>
 898  *         <entry>#gint</entry>
 899  *         <entry>border-radius: 5;</entry>
 900  *       </row>
 901  *       <row>
 902  *         <entry>border-style</entry>
 903  *         <entry>[none|solid|inset|outset]</entry>
 904  *         <entry>#GtkBorderStyle</entry>
 905  *         <entry>border-style: solid;</entry>
 906  *       </row>
 907  *       <row>
 908  *         <entry>border-image</entry>
 909  *         <entry><literallayout>border image (see above)</literallayout></entry>
 910  *         <entry>internal use only</entry>
 911  *         <entry><literallayout>border-image: url("/path/to/image.png") 3 4 3 4 stretch;
 912  * border-image: url("/path/to/image.png") 3 4 4 3 repeat stretch;</literallayout>
 913  *         </entry>
 914  *       </row>
 915  *       <row>
 916  *         <entry>text-shadow</entry>
 917  *         <entry>shadow list (see above)</entry>
 918  *         <entry>#GtkTextShadow</entry>
 919  *         <entry><literallayout>text-shadow: 1 1 0 blue, -4 -4 red;</literallayout></entry>
 920  *       </row>
 921  *       <row>
 922  *         <entry>transition</entry>
 923  *         <entry>transition (see above)</entry>
 924  *         <entry>internal use only</entry>
 925  *         <entry><literallayout>transition: 150ms ease-in-out;
 926  * transition: 1s linear loop;</literallayout>
 927  *         </entry>
 928  *       </row>
 929  *       <row>
 930  *         <entry>gtk-key-bindings</entry>
 931  *         <entry>binding set name list</entry>
 932  *         <entry>internal use only</entry>
 933  *         <entry><literallayout>gtk-bindings: binding1, binding2, ...;</literallayout>
 934  *         </entry>
 935  *       </row>
 936  *     </tbody>
 937  *   </tgroup>
 938  * </informaltable>
 939  * <para>
 940  * GtkThemingEngines can register their own, engine-specific style properties
 941  * with the function gtk_theming_engine_register_property(). These properties
 942  * can be set in CSS like other properties, using a name of the form
 943  * <literallayout>-<replaceable>namespace</replaceable>-<replaceable>name</replaceable></literallayout>, where <replaceable>namespace</replaceable> is typically
 944  * the name of the theming engine, and <replaceable>name</replaceable> is the
 945  * name of the property. Style properties that have been registered by widgets
 946  * using gtk_widget_class_install_style_property() can also be set in this
 947  * way, using the widget class name for <replaceable>namespace</replaceable>.
 948  * </para>
 949  * <example>
 950  * <title>Using engine-specific style properties</title>
 951  * <programlisting>
 952  * * {
 953  *     engine: clearlooks;
 954  *     border-radius: 4;
 955  *     -GtkPaned-handle-size: 6;
 956  *     -clearlooks-colorize-scrollbar: false;
 957  * }
 958  * </programlisting>
 959  * </example>
 960  * </refsect2>
 961  */
 962
 963 typedef struct GtkCssRuleset GtkCssRuleset;
 964 typedef struct _GtkCssScanner GtkCssScanner;
 965 typedef enum ParserScope ParserScope;
 966 typedef enum ParserSymbol ParserSymbol;
 967
 968 struct GtkCssRuleset
 969 {
 970   GtkCssSelector *selector;
 971   GHashTable *widget_style;
 972   GHashTable *style;
 973   GtkBitmask *set_styles;
 974 };
 975
 976 struct _GtkCssScanner
 977 {
 978   GtkCssProvider *provider;
 979   GtkCssParser *parser;
 980   GtkCssSection *section;
 981   GtkCssScanner *parent;
 982   GFile *file;
 983   GFile *base;
 984   GSList *state;
 985 };
 986
 987 struct _GtkCssProviderPrivate
 988 {
 989   GScanner *scanner;
 990
 991   GHashTable *symbolic_colors;
 992
 993   GArray *rulesets;
 994   GResource *resource;
 995 };
 996
 997 enum {
 998   PARSING_ERROR,
 999   LAST_SIGNAL
1000 };
1001
1002 static guint css_provider_signals[LAST_SIGNAL] = { 0 };
1003
1004 static void gtk_css_provider_finalize (GObject *object);
1005 static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
1006 static void gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface);
1007
1008 static gboolean
1009 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
1010                                 GtkCssScanner  *scanner,
1011                                 GFile          *file,
1012                                 const char     *data,
1013                                 GError        **error);
1014
1015 GQuark
1016 gtk_css_provider_error_quark (void)
1017 {
1018   return g_quark_from_static_string ("gtk-css-provider-error-quark");
1019 }
1020
1021 G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
1022                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
1023                                                gtk_css_style_provider_iface_init)
1024                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER_PRIVATE,
1025                                                gtk_css_style_provider_private_iface_init));
1026
1027 static void
1028 gtk_css_provider_parsing_error (GtkCssProvider  *provider,
1029                                 GtkCssSection   *section,
1030                                 const GError    *error)
1031 {
1032   /* Only emit a warning when we have no error handlers. This is our
1033    * default handlers. And in this case erroneous CSS files are a bug
1034    * and should be fixed.
1035    * Note that these warnings can also be triggered by a broken theme
1036    * that people installed from some weird location on the internets.
1037    */
1038   if (!g_signal_has_handler_pending (provider,
1039                                      css_provider_signals[PARSING_ERROR],
1040                                      0,
1041                                      TRUE))
1042     {
1043       GFileInfo *info;
1044       GFile *file;
1045       const char *path;
1046
1047       file = gtk_css_section_get_file (section);
1048       if (file)
1049         {
1050           info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1051
1052           if (info)
1053             path = g_file_info_get_display_name (info);
1054           else
1055             path = "<broken file>";
1056         }
1057       else
1058         {
1059           info = NULL;
1060           path = "<data>";
1061         }
1062
1063       g_warning ("Theme parsing error: %s:%u:%u: %s",
1064                  path,
1065                  gtk_css_section_get_end_line (section) + 1,
1066                  gtk_css_section_get_end_position (section),
1067                  error->message);
1068
1069       if (info)
1070         g_object_unref (info);
1071     }
1072 }
1073
1074 static void
1075 gtk_css_provider_class_init (GtkCssProviderClass *klass)
1076 {
1077   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1078
1079   /**
1080    * GtkCssProvider::parsing-error:
1081    * @provider: the provider that had a parsing error
1082    * @section: section the error happened in
1083    * @error: The parsing error
1084    *
1085    * Signals that a parsing error occured. the @path, @line and @position
1086    * describe the actual location of the error as accurately as possible.
1087    *
1088    * Parsing errors are never fatal, so the parsing will resume after
1089    * the error. Errors may however cause parts of the given
1090    * data or even all of it to not be parsed at all. So it is a useful idea
1091    * to check that the parsing succeeds by connecting to this signal.
1092    *
1093    * Note that this signal may be emitted at any time as the css provider
1094    * may opt to defer parsing parts or all of the input to a later time
1095    * than when a loading function was called.
1096    */
1097   css_provider_signals[PARSING_ERROR] =
1098     g_signal_new (I_("parsing-error"),
1099                   G_TYPE_FROM_CLASS (object_class),
1100                   G_SIGNAL_RUN_LAST,
1101                   G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
1102                   NULL, NULL,
1103                   _gtk_marshal_VOID__BOXED_BOXED,
1104                   G_TYPE_NONE, 2, GTK_TYPE_CSS_SECTION, G_TYPE_ERROR);
1105
1106   object_class->finalize = gtk_css_provider_finalize;
1107
1108   klass->parsing_error = gtk_css_provider_parsing_error;
1109
1110   g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
1111 }
1112
1113 static void
1114 gtk_css_ruleset_init_copy (GtkCssRuleset       *new,
1115                            const GtkCssRuleset *ruleset,
1116                            GtkCssSelector      *selector)
1117 {
1118   memcpy (new, ruleset, sizeof (GtkCssRuleset));
1119
1120   new->selector = selector;
1121   if (new->widget_style)
1122     g_hash_table_ref (new->widget_style);
1123   if (new->style)
1124     g_hash_table_ref (new->style);
1125   if (new->set_styles)
1126     new->set_styles = _gtk_bitmask_copy (new->set_styles);
1127 }
1128
1129 static void
1130 gtk_css_ruleset_clear (GtkCssRuleset *ruleset)
1131 {
1132   if (ruleset->style)
1133     g_hash_table_unref (ruleset->style);
1134   if (ruleset->set_styles)
1135     _gtk_bitmask_free (ruleset->set_styles);
1136   if (ruleset->widget_style)
1137     g_hash_table_unref (ruleset->widget_style);
1138   if (ruleset->selector)
1139     _gtk_css_selector_free (ruleset->selector);
1140
1141   memset (ruleset, 0, sizeof (GtkCssRuleset));
1142 }
1143
1144 typedef struct _PropertyValue PropertyValue;
1145 struct _PropertyValue {
1146   GtkCssSection *section;
1147   GValue         value;
1148 };
1149
1150 static PropertyValue *
1151 property_value_new (GtkCssSection *section)
1152 {
1153   PropertyValue *value;
1154
1155   value = g_slice_new0 (PropertyValue);
1156
1157   value->section = gtk_css_section_ref (section);
1158
1159   return value;
1160 }
1161
1162 static void
1163 property_value_free (PropertyValue *value)
1164 {
1165   if (G_IS_VALUE (&value->value))
1166     g_value_unset (&value->value);
1167
1168   gtk_css_section_unref (value->section);
1169
1170   g_slice_free (PropertyValue, value);
1171 }
1172
1173 static void
1174 gtk_css_ruleset_add_style (GtkCssRuleset *ruleset,
1175                            char          *name,
1176                            PropertyValue *value)
1177 {
1178   if (ruleset->widget_style == NULL)
1179     ruleset->widget_style = g_hash_table_new_full (g_str_hash,
1180                                                    g_str_equal,
1181                                                    (GDestroyNotify) g_free,
1182                                                    (GDestroyNotify) property_value_free);
1183
1184   g_hash_table_insert (ruleset->widget_style, name, value);
1185 }
1186
1187 static void
1188 gtk_css_ruleset_add (GtkCssRuleset    *ruleset,
1189                      GtkStyleProperty *prop,
1190                      PropertyValue    *value)
1191 {
1192   if (ruleset->style == NULL)
1193     {
1194       ruleset->style = g_hash_table_new_full (g_direct_hash,
1195                                               g_direct_equal,
1196                                               NULL,
1197                                               (GDestroyNotify) property_value_free);
1198       ruleset->set_styles = _gtk_bitmask_new ();
1199     }
1200
1201   if (GTK_IS_CSS_SHORTHAND_PROPERTY (prop))
1202     {
1203       GtkCssShorthandProperty *shorthand = GTK_CSS_SHORTHAND_PROPERTY (prop);
1204       GArray *array = g_value_get_boxed (&value->value);
1205       guint i;
1206
1207       for (i = 0; i < _gtk_css_shorthand_property_get_n_subproperties (shorthand); i++)
1208         {
1209           GtkCssStyleProperty *child = _gtk_css_shorthand_property_get_subproperty (shorthand, i);
1210           const GValue *sub = &g_array_index (array, GValue, i);
1211           PropertyValue *val;
1212
1213           val = property_value_new (value->section);
1214           g_value_init (&val->value, G_VALUE_TYPE (sub));
1215           g_value_copy (sub, &val->value);
1216           gtk_css_ruleset_add (ruleset, GTK_STYLE_PROPERTY (child), val);
1217         }
1218       property_value_free (value);
1219     }
1220   else if (GTK_IS_CSS_STYLE_PROPERTY (prop))
1221     {
1222       g_return_if_fail (_gtk_css_style_property_is_specified_type (GTK_CSS_STYLE_PROPERTY (prop),
1223                                                                    G_VALUE_TYPE (&value->value)));
1224
1225       _gtk_bitmask_set (ruleset->set_styles,
1226                         _gtk_css_style_property_get_id (GTK_CSS_STYLE_PROPERTY (prop)),
1227                         TRUE);
1228       g_hash_table_insert (ruleset->style, prop, value);
1229     }
1230   else
1231     {
1232       g_assert_not_reached ();
1233     }
1234 }
1235
1236 static gboolean
1237 gtk_css_ruleset_matches (GtkCssRuleset *ruleset,
1238                          GtkWidgetPath *path,
1239                          GtkStateFlags  state)
1240 {
1241   return _gtk_css_selector_matches (ruleset->selector, path, state);
1242 }
1243
1244 static void
1245 gtk_css_scanner_destroy (GtkCssScanner *scanner)
1246 {
1247   if (scanner->section)
1248     gtk_css_section_unref (scanner->section);
1249   g_object_unref (scanner->provider);
1250   if (scanner->file)
1251     g_object_unref (scanner->file);
1252   g_object_unref (scanner->base);
1253   _gtk_css_parser_free (scanner->parser);
1254
1255   g_slice_free (GtkCssScanner, scanner);
1256 }
1257
1258 static void
1259 gtk_css_provider_emit_error (GtkCssProvider *provider,
1260                              GtkCssScanner  *scanner,
1261                              const GError   *error)
1262 {
1263   g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
1264                  scanner != NULL ? scanner->section : NULL, error);
1265 }
1266
1267 static void
1268 gtk_css_scanner_parser_error (GtkCssParser *parser,
1269                               const GError *error,
1270                               gpointer      user_data)
1271 {
1272   GtkCssScanner *scanner = user_data;
1273
1274   gtk_css_provider_emit_error (scanner->provider,
1275                                scanner,
1276                                error);
1277 }
1278
1279 static GtkCssScanner *
1280 gtk_css_scanner_new (GtkCssProvider *provider,
1281                      GtkCssScanner  *parent,
1282                      GtkCssSection  *section,
1283                      GFile          *file,
1284                      const gchar    *text)
1285 {
1286   GtkCssScanner *scanner;
1287
1288   scanner = g_slice_new0 (GtkCssScanner);
1289
1290   g_object_ref (provider);
1291   scanner->provider = provider;
1292   scanner->parent = parent;
1293   if (section)
1294     scanner->section = gtk_css_section_ref (section);
1295
1296   if (file)
1297     {
1298       scanner->file = g_object_ref (file);
1299       scanner->base = g_file_get_parent (file);
1300     }
1301   else
1302     {
1303       char *dir = g_get_current_dir ();
1304       scanner->base = g_file_new_for_path (dir);
1305       g_free (dir);
1306     }
1307
1308   scanner->parser = _gtk_css_parser_new (text,
1309                                          gtk_css_scanner_parser_error,
1310                                          scanner);
1311
1312   return scanner;
1313 }
1314
1315 static GFile *
1316 gtk_css_scanner_get_base_url (GtkCssScanner *scanner)
1317 {
1318   return scanner->base;
1319 }
1320
1321 static gboolean
1322 gtk_css_scanner_would_recurse (GtkCssScanner *scanner,
1323                                GFile         *file)
1324 {
1325   while (scanner)
1326     {
1327       if (scanner->file && g_file_equal (scanner->file, file))
1328         return TRUE;
1329
1330       scanner = scanner->parent;
1331     }
1332
1333   return FALSE;
1334 }
1335
1336 static void
1337 gtk_css_scanner_push_section (GtkCssScanner     *scanner,
1338                               GtkCssSectionType  section_type)
1339 {
1340   GtkCssSection *section;
1341
1342   section = _gtk_css_section_new (scanner->section,
1343                                   section_type,
1344                                   scanner->parser,
1345                                   scanner->file);
1346
1347   if (scanner->section)
1348     gtk_css_section_unref (scanner->section);
1349   scanner->section = section;
1350 }
1351
1352 static void
1353 gtk_css_scanner_pop_section (GtkCssScanner *scanner,
1354                              GtkCssSectionType check_type)
1355 {
1356   GtkCssSection *parent;
1357
1358   g_assert (gtk_css_section_get_section_type (scanner->section) == check_type);
1359
1360   parent = gtk_css_section_get_parent (scanner->section);
1361   if (parent)
1362     gtk_css_section_ref (parent);
1363
1364   _gtk_css_section_end (scanner->section);
1365   gtk_css_section_unref (scanner->section);
1366
1367   scanner->section = parent;
1368 }
1369
1370 static void
1371 gtk_css_provider_init (GtkCssProvider *css_provider)
1372 {
1373   GtkCssProviderPrivate *priv;
1374
1375   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1376                                                            GTK_TYPE_CSS_PROVIDER,
1377                                                            GtkCssProviderPrivate);
1378
1379   priv->rulesets = g_array_new (FALSE, FALSE, sizeof (GtkCssRuleset));
1380
1381   priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
1382                                                  (GDestroyNotify) g_free,
1383                                                  (GDestroyNotify) gtk_symbolic_color_unref);
1384 }
1385
1386 static void
1387 css_provider_dump_symbolic_colors (GtkCssProvider     *css_provider,
1388                                    GtkStyleProperties *props)
1389 {
1390   GtkCssProviderPrivate *priv;
1391   GHashTableIter iter;
1392   gpointer key, value;
1393
1394   priv = css_provider->priv;
1395   g_hash_table_iter_init (&iter, priv->symbolic_colors);
1396
1397   while (g_hash_table_iter_next (&iter, &key, &value))
1398     {
1399       const gchar *name;
1400       GtkSymbolicColor *color;
1401
1402       name = key;
1403       color = value;
1404
1405       gtk_style_properties_map_color (props, name, color);
1406     }
1407 }
1408
1409 static GtkStyleProperties *
1410 gtk_css_provider_get_style (GtkStyleProvider *provider,
1411                             GtkWidgetPath    *path)
1412 {
1413   GtkCssProvider *css_provider;
1414   GtkCssProviderPrivate *priv;
1415   GtkStyleProperties *props;
1416   guint i;
1417
1418   css_provider = GTK_CSS_PROVIDER (provider);
1419   priv = css_provider->priv;
1420   props = gtk_style_properties_new ();
1421
1422   css_provider_dump_symbolic_colors (css_provider, props);
1423
1424   for (i = 0; i < priv->rulesets->len; i++)
1425     {
1426       GtkCssRuleset *ruleset;
1427       GHashTableIter iter;
1428       gpointer key, val;
1429
1430       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1431
1432       if (ruleset->style == NULL)
1433         continue;
1434
1435       if (!gtk_css_ruleset_matches (ruleset, path, 0))
1436         continue;
1437
1438       g_hash_table_iter_init (&iter, ruleset->style);
1439
1440       while (g_hash_table_iter_next (&iter, &key, &val))
1441         {
1442           GtkCssStyleProperty *prop = key;
1443           PropertyValue *value = val;
1444
1445           _gtk_style_properties_set_property_by_property (props,
1446                                                           prop,
1447                                                           _gtk_css_selector_get_state_flags (ruleset->selector),
1448                                                           &value->value);
1449         }
1450     }
1451
1452   return props;
1453 }
1454
1455 static gboolean
1456 gtk_css_provider_get_style_property (GtkStyleProvider *provider,
1457                                      GtkWidgetPath    *path,
1458                                      GtkStateFlags     state,
1459                                      GParamSpec       *pspec,
1460                                      GValue           *value)
1461 {
1462   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1463   GtkCssProviderPrivate *priv = css_provider->priv;
1464   PropertyValue *val;
1465   gboolean found = FALSE;
1466   gchar *prop_name;
1467   gint i;
1468
1469   prop_name = g_strdup_printf ("-%s-%s",
1470                                g_type_name (pspec->owner_type),
1471                                pspec->name);
1472
1473   for (i = priv->rulesets->len - 1; i >= 0; i--)
1474     {
1475       GtkCssRuleset *ruleset;
1476
1477       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1478
1479       if (ruleset->widget_style == NULL)
1480         continue;
1481
1482       if (!gtk_css_ruleset_matches (ruleset, path, state))
1483         continue;
1484
1485       val = g_hash_table_lookup (ruleset->widget_style, prop_name);
1486
1487       if (val)
1488         {
1489           GtkCssScanner *scanner;
1490
1491           scanner = gtk_css_scanner_new (css_provider,
1492                                          NULL,
1493                                          val->section,
1494                                          gtk_css_section_get_file (val->section),
1495                                          g_value_get_string (&val->value));
1496
1497           found = _gtk_css_style_parse_value (value,
1498                                               scanner->parser,
1499                                               NULL);
1500
1501           gtk_css_scanner_destroy (scanner);
1502
1503           if (found)
1504             break;
1505         }
1506     }
1507
1508   g_free (prop_name);
1509
1510   return found;
1511 }
1512
1513 static void
1514 gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
1515 {
1516   iface->get_style = gtk_css_provider_get_style;
1517   iface->get_style_property = gtk_css_provider_get_style_property;
1518 }
1519
1520 static GtkSymbolicColor *
1521 gtk_css_style_provider_get_color (GtkStyleProviderPrivate *provider,
1522                                   const char              *name)
1523 {
1524   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1525
1526   return g_hash_table_lookup (css_provider->priv->symbolic_colors, name);
1527 }
1528
1529 static void
1530 gtk_css_style_provider_lookup (GtkStyleProviderPrivate *provider,
1531                                GtkWidgetPath           *path,
1532                                GtkStateFlags            state,
1533                                GtkCssLookup            *lookup)
1534 {
1535   GtkCssProvider *css_provider;
1536   GtkCssProviderPrivate *priv;
1537   int i;
1538
1539   css_provider = GTK_CSS_PROVIDER (provider);
1540   priv = css_provider->priv;
1541
1542   for (i = priv->rulesets->len - 1; i >= 0; i--)
1543     {
1544       GtkCssRuleset *ruleset;
1545       GHashTableIter iter;
1546       gpointer key, val;
1547
1548       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1549
1550       if (ruleset->style == NULL)
1551         continue;
1552
1553       if (!_gtk_bitmask_intersects (_gtk_css_lookup_get_missing (lookup),
1554                                     ruleset->set_styles))
1555         continue;
1556
1557       if (!gtk_css_ruleset_matches (ruleset, path, state))
1558         continue;
1559
1560       g_hash_table_iter_init (&iter, ruleset->style);
1561
1562       while (g_hash_table_iter_next (&iter, &key, &val))
1563         {
1564           GtkCssStyleProperty *prop = key;
1565           PropertyValue *value = val;
1566           guint id = _gtk_css_style_property_get_id (prop);
1567
1568           if (!_gtk_css_lookup_is_missing (lookup, id))
1569             continue;
1570
1571           _gtk_css_lookup_set (lookup, id, value->section, &value->value);
1572         }
1573     }
1574 }
1575
1576 static void
1577 gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface)
1578 {
1579   iface->get_color = gtk_css_style_provider_get_color;
1580   iface->lookup = gtk_css_style_provider_lookup;
1581 }
1582
1583 static void
1584 gtk_css_provider_finalize (GObject *object)
1585 {
1586   GtkCssProvider *css_provider;
1587   GtkCssProviderPrivate *priv;
1588   guint i;
1589
1590   css_provider = GTK_CSS_PROVIDER (object);
1591   priv = css_provider->priv;
1592
1593   for (i = 0; i < priv->rulesets->len; i++)
1594     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1595
1596   g_array_free (priv->rulesets, TRUE);
1597
1598   if (priv->symbolic_colors)
1599     g_hash_table_destroy (priv->symbolic_colors);
1600
1601   if (priv->resource)
1602     {
1603       g_resources_unregister (priv->resource);
1604       g_resource_unref (priv->resource);
1605       priv->resource = NULL;
1606     }
1607
1608   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1609 }
1610
1611 /**
1612  * gtk_css_provider_new:
1613  *
1614  * Returns a newly created #GtkCssProvider.
1615  *
1616  * Returns: A new #GtkCssProvider
1617  **/
1618 GtkCssProvider *
1619 gtk_css_provider_new (void)
1620 {
1621   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1622 }
1623
1624 static void
1625 gtk_css_provider_take_error (GtkCssProvider *provider,
1626                              GtkCssScanner  *scanner,
1627                              GError         *error)
1628 {
1629   gtk_css_provider_emit_error (provider,
1630                                scanner,
1631                                error);
1632
1633   g_error_free (error);
1634 }
1635
1636 static void
1637 gtk_css_provider_error_literal (GtkCssProvider *provider,
1638                                 GtkCssScanner  *scanner,
1639                                 GQuark          domain,
1640                                 gint            code,
1641                                 const char     *message)
1642 {
1643   gtk_css_provider_take_error (provider,
1644                                scanner,
1645                                g_error_new_literal (domain, code, message));
1646 }
1647
1648 static void
1649 gtk_css_provider_error (GtkCssProvider *provider,
1650                         GtkCssScanner  *scanner,
1651                         GQuark          domain,
1652                         gint            code,
1653                         const char     *format,
1654                         ...)  G_GNUC_PRINTF (5, 6);
1655 static void
1656 gtk_css_provider_error (GtkCssProvider *provider,
1657                         GtkCssScanner  *scanner,
1658                         GQuark          domain,
1659                         gint            code,
1660                         const char     *format,
1661                         ...)
1662 {
1663   GError *error;
1664   va_list args;
1665
1666   va_start (args, format);
1667   error = g_error_new_valist (domain, code, format, args);
1668   va_end (args);
1669
1670   gtk_css_provider_take_error (provider, scanner, error);
1671 }
1672
1673 static void
1674 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1675                                 GtkCssScanner  *scanner,
1676                                 const char     *expected)
1677 {
1678   gtk_css_provider_error (provider,
1679                           scanner,
1680                           GTK_CSS_PROVIDER_ERROR,
1681                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1682                           "expected a valid %s", expected);
1683 }
1684
1685 static void
1686 css_provider_commit (GtkCssProvider *css_provider,
1687                      GSList         *selectors,
1688                      GtkCssRuleset  *ruleset)
1689 {
1690   GtkCssProviderPrivate *priv;
1691   GSList *l;
1692
1693   priv = css_provider->priv;
1694
1695   if (ruleset->style == NULL && ruleset->widget_style == NULL)
1696     {
1697       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
1698       return;
1699     }
1700
1701   for (l = selectors; l; l = l->next)
1702     {
1703       GtkCssRuleset new;
1704
1705       gtk_css_ruleset_init_copy (&new, ruleset, l->data);
1706
1707       g_array_append_val (priv->rulesets, new);
1708     }
1709
1710   g_slist_free (selectors);
1711 }
1712
1713 static void
1714 gtk_css_provider_reset (GtkCssProvider *css_provider)
1715 {
1716   GtkCssProviderPrivate *priv;
1717   guint i;
1718
1719   priv = css_provider->priv;
1720
1721   if (priv->resource)
1722     {
1723       g_resources_unregister (priv->resource);
1724       g_resource_unref (priv->resource);
1725       priv->resource = NULL;
1726     }
1727
1728   g_hash_table_remove_all (priv->symbolic_colors);
1729
1730   for (i = 0; i < priv->rulesets->len; i++)
1731     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1732   g_array_set_size (priv->rulesets, 0);
1733 }
1734
1735 static void
1736 gtk_css_provider_propagate_error (GtkCssProvider  *provider,
1737                                   GtkCssSection   *section,
1738                                   const GError    *error,
1739                                   GError         **propagate_to)
1740 {
1741
1742   GFileInfo *info;
1743   GFile *file;
1744   const char *path;
1745
1746   file = gtk_css_section_get_file (section);
1747   if (file)
1748     {
1749       info = g_file_query_info (file,G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1750
1751       if (info)
1752         path = g_file_info_get_display_name (info);
1753       else
1754         path = "<broken file>";
1755     }
1756   else
1757     {
1758       info = NULL;
1759       path = "<unknown>";
1760     }
1761
1762   /* don't fail for deprecations */
1763   if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
1764     {
1765       g_warning ("Theme parsing error: %s:%u:%u: %s", path,
1766                  gtk_css_section_get_end_line (section) + 1,
1767                  gtk_css_section_get_end_position (section), error->message);
1768       return;
1769     }
1770
1771   /* we already set an error. And we'd like to keep the first one */
1772   if (*propagate_to)
1773     return;
1774
1775   *propagate_to = g_error_copy (error);
1776   g_prefix_error (propagate_to, "%s:%u:%u: ", path,
1777                   gtk_css_section_get_end_line (section) + 1,
1778                   gtk_css_section_get_end_position (section));
1779
1780   if (info)
1781     g_object_unref (info);
1782 }
1783
1784 static gboolean
1785 parse_import (GtkCssScanner *scanner)
1786 {
1787   GFile *file;
1788
1789   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_IMPORT);
1790
1791   if (!_gtk_css_parser_try (scanner->parser, "@import", TRUE))
1792     {
1793       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1794       return FALSE;
1795     }
1796
1797   if (_gtk_css_parser_is_string (scanner->parser))
1798     {
1799       char *uri;
1800
1801       uri = _gtk_css_parser_read_string (scanner->parser);
1802       file = g_file_resolve_relative_path (gtk_css_scanner_get_base_url (scanner), uri);
1803       g_free (uri);
1804     }
1805   else
1806     {
1807       file = _gtk_css_parser_read_url (scanner->parser,
1808                                        gtk_css_scanner_get_base_url (scanner));
1809     }
1810
1811   if (file == NULL)
1812     {
1813       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1814       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1815       return TRUE;
1816     }
1817
1818   if (!_gtk_css_parser_try (scanner->parser, ";", FALSE))
1819     {
1820       gtk_css_provider_invalid_token (scanner->provider, scanner, "semicolon");
1821       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1822     }
1823   else if (gtk_css_scanner_would_recurse (scanner, file))
1824     {
1825        char *path = g_file_get_path (file);
1826        gtk_css_provider_error (scanner->provider,
1827                                scanner,
1828                                GTK_CSS_PROVIDER_ERROR,
1829                                GTK_CSS_PROVIDER_ERROR_IMPORT,
1830                                "Loading '%s' would recurse",
1831                                path);
1832        g_free (path);
1833     }
1834   else
1835     {
1836       gtk_css_provider_load_internal (scanner->provider,
1837                                       scanner,
1838                                       file,
1839                                       NULL,
1840                                       NULL);
1841     }
1842
1843   g_object_unref (file);
1844
1845   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1846   _gtk_css_parser_skip_whitespace (scanner->parser);
1847
1848   return TRUE;
1849 }
1850
1851 static gboolean
1852 parse_color_definition (GtkCssScanner *scanner)
1853 {
1854   GtkSymbolicColor *symbolic;
1855   char *name;
1856
1857   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1858
1859   if (!_gtk_css_parser_try (scanner->parser, "@define-color", TRUE))
1860     {
1861       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1862       return FALSE;
1863     }
1864
1865   name = _gtk_css_parser_try_name (scanner->parser, TRUE);
1866   if (name == NULL)
1867     {
1868       gtk_css_provider_error_literal (scanner->provider,
1869                                       scanner,
1870                                       GTK_CSS_PROVIDER_ERROR,
1871                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1872                                       "Not a valid color name");
1873       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1874       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1875       return TRUE;
1876     }
1877
1878   symbolic = _gtk_css_parser_read_symbolic_color (scanner->parser);
1879   if (symbolic == NULL)
1880     {
1881       g_free (name);
1882       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1883       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1884       return TRUE;
1885     }
1886
1887   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1888     {
1889       g_free (name);
1890       gtk_symbolic_color_unref (symbolic);
1891       gtk_css_provider_error_literal (scanner->provider,
1892                                       scanner,
1893                                       GTK_CSS_PROVIDER_ERROR,
1894                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1895                                       "Missing semicolon at end of color definition");
1896       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1897
1898       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1899       return TRUE;
1900     }
1901
1902   g_hash_table_insert (scanner->provider->priv->symbolic_colors, name, symbolic);
1903
1904   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1905   return TRUE;
1906 }
1907
1908 static gboolean
1909 parse_binding_set (GtkCssScanner *scanner)
1910 {
1911   GtkBindingSet *binding_set;
1912   char *name;
1913
1914   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1915
1916   if (!_gtk_css_parser_try (scanner->parser, "@binding-set", TRUE))
1917     {
1918       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1919       return FALSE;
1920     }
1921
1922   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1923   if (name == NULL)
1924     {
1925       gtk_css_provider_error_literal (scanner->provider,
1926                                       scanner,
1927                                       GTK_CSS_PROVIDER_ERROR,
1928                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1929                                       "Expected name for binding set");
1930       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1931       goto skip_semicolon;
1932     }
1933
1934   binding_set = gtk_binding_set_find (name);
1935   if (!binding_set)
1936     {
1937       binding_set = gtk_binding_set_new (name);
1938       binding_set->parsed = TRUE;
1939     }
1940   g_free (name);
1941
1942   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
1943     {
1944       gtk_css_provider_error_literal (scanner->provider,
1945                                       scanner,
1946                                       GTK_CSS_PROVIDER_ERROR,
1947                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1948                                       "Expected '{' for binding set");
1949       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1950       goto skip_semicolon;
1951     }
1952
1953   while (!_gtk_css_parser_is_eof (scanner->parser) &&
1954          !_gtk_css_parser_begins_with (scanner->parser, '}'))
1955     {
1956       name = _gtk_css_parser_read_value (scanner->parser);
1957       if (name == NULL)
1958         {
1959           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1960           continue;
1961         }
1962
1963       if (gtk_binding_entry_add_signal_from_string (binding_set, name) != G_TOKEN_NONE)
1964         {
1965           gtk_css_provider_error_literal (scanner->provider,
1966                                           scanner,
1967                                           GTK_CSS_PROVIDER_ERROR,
1968                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1969                                           "Failed to parse binding set.");
1970         }
1971
1972       g_free (name);
1973
1974       if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1975         {
1976           if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
1977               !_gtk_css_parser_is_eof (scanner->parser))
1978             {
1979               gtk_css_provider_error_literal (scanner->provider,
1980                                               scanner,
1981                                               GTK_CSS_PROVIDER_ERROR,
1982                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
1983                                               "Expected semicolon");
1984               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
1985             }
1986         }
1987     }
1988
1989   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
1990     {
1991       gtk_css_provider_error_literal (scanner->provider,
1992                                       scanner,
1993                                       GTK_CSS_PROVIDER_ERROR,
1994                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1995                                       "expected '}' after declarations");
1996       if (!_gtk_css_parser_is_eof (scanner->parser))
1997         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
1998     }
1999
2000 skip_semicolon:
2001   if (_gtk_css_parser_begins_with (scanner->parser, ';'))
2002     {
2003       gtk_css_provider_error_literal (scanner->provider,
2004                                       scanner,
2005                                       GTK_CSS_PROVIDER_ERROR,
2006                                       GTK_CSS_PROVIDER_ERROR_DEPRECATED,
2007                                       "Nonstandard semicolon at end of binding set");
2008       _gtk_css_parser_try (scanner->parser, ";", TRUE);
2009     }
2010
2011   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
2012
2013   return TRUE;
2014 }
2015
2016 static void
2017 parse_at_keyword (GtkCssScanner *scanner)
2018 {
2019   if (parse_import (scanner))
2020     return;
2021   if (parse_color_definition (scanner))
2022     return;
2023   if (parse_binding_set (scanner))
2024     return;
2025
2026   else
2027     {
2028       gtk_css_provider_error_literal (scanner->provider,
2029                                       scanner,
2030                                       GTK_CSS_PROVIDER_ERROR,
2031                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2032                                       "unknown @ rule");
2033       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2034     }
2035 }
2036
2037 static gboolean
2038 parse_selector_class (GtkCssScanner *scanner, GArray *classes)
2039 {
2040   GQuark qname;
2041   char *name;
2042
2043   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
2044
2045   if (name == NULL)
2046     {
2047       gtk_css_provider_error_literal (scanner->provider,
2048                                       scanner,
2049                                       GTK_CSS_PROVIDER_ERROR,
2050                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2051                                       "Expected a valid name for class");
2052       return FALSE;
2053     }
2054
2055   qname = g_quark_from_string (name);
2056   g_array_append_val (classes, qname);
2057   g_free (name);
2058   return TRUE;
2059 }
2060
2061 static gboolean
2062 parse_selector_name (GtkCssScanner *scanner, GArray *names)
2063 {
2064   GQuark qname;
2065   char *name;
2066
2067   name = _gtk_css_parser_try_name (scanner->parser, FALSE);
2068
2069   if (name == NULL)
2070     {
2071       gtk_css_provider_error_literal (scanner->provider,
2072                                       scanner,
2073                                       GTK_CSS_PROVIDER_ERROR,
2074                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2075                                       "Expected a valid name for id");
2076       return FALSE;
2077     }
2078
2079   qname = g_quark_from_string (name);
2080   g_array_append_val (names, qname);
2081   g_free (name);
2082   return TRUE;
2083 }
2084
2085 static gboolean
2086 parse_selector_pseudo_class (GtkCssScanner  *scanner,
2087                              GtkRegionFlags *region_to_modify,
2088                              GtkStateFlags  *state_to_modify)
2089 {
2090   struct {
2091     const char *name;
2092     GtkRegionFlags region_flag;
2093     GtkStateFlags state_flag;
2094   } pseudo_classes[] = {
2095     { "first-child",  GTK_REGION_FIRST, 0 },
2096     { "last-child",   GTK_REGION_LAST, 0 },
2097     { "only-child",   GTK_REGION_ONLY, 0 },
2098     { "sorted",       GTK_REGION_SORTED, 0 },
2099     { "active",       0, GTK_STATE_FLAG_ACTIVE },
2100     { "prelight",     0, GTK_STATE_FLAG_PRELIGHT },
2101     { "hover",        0, GTK_STATE_FLAG_PRELIGHT },
2102     { "selected",     0, GTK_STATE_FLAG_SELECTED },
2103     { "insensitive",  0, GTK_STATE_FLAG_INSENSITIVE },
2104     { "inconsistent", 0, GTK_STATE_FLAG_INCONSISTENT },
2105     { "focused",      0, GTK_STATE_FLAG_FOCUSED },
2106     { "focus",        0, GTK_STATE_FLAG_FOCUSED },
2107     { "backdrop",     0, GTK_STATE_FLAG_BACKDROP },
2108     { NULL, }
2109   }, nth_child_classes[] = {
2110     { "first",        GTK_REGION_FIRST, 0 },
2111     { "last",         GTK_REGION_LAST, 0 },
2112     { "even",         GTK_REGION_EVEN, 0 },
2113     { "odd",          GTK_REGION_ODD, 0 },
2114     { NULL, }
2115   }, *classes;
2116   guint i;
2117   char *name;
2118
2119   name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
2120   if (name == NULL)
2121     {
2122       gtk_css_provider_error_literal (scanner->provider,
2123                                       scanner,
2124                                       GTK_CSS_PROVIDER_ERROR,
2125                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2126                                       "Missing name of pseudo-class");
2127       return FALSE;
2128     }
2129
2130   if (_gtk_css_parser_try (scanner->parser, "(", TRUE))
2131     {
2132       char *function = name;
2133
2134       name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2135       if (!_gtk_css_parser_try (scanner->parser, ")", FALSE))
2136         {
2137           gtk_css_provider_error_literal (scanner->provider,
2138                                           scanner,
2139                                           GTK_CSS_PROVIDER_ERROR,
2140                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2141                                           "Missing closing bracket for pseudo-class");
2142           return FALSE;
2143         }
2144
2145       if (g_ascii_strcasecmp (function, "nth-child") != 0)
2146         {
2147           gtk_css_provider_error (scanner->provider,
2148                                   scanner,
2149                                   GTK_CSS_PROVIDER_ERROR,
2150                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2151                                   "Unknown pseudo-class '%s(%s)'", function, name ? name : "");
2152           g_free (function);
2153           g_free (name);
2154           return FALSE;
2155         }
2156
2157       g_free (function);
2158
2159       if (name == NULL)
2160         {
2161           gtk_css_provider_error (scanner->provider,
2162                                   scanner,
2163                                   GTK_CSS_PROVIDER_ERROR,
2164                                   GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2165                                   "nth-child() requires an argument");
2166           return FALSE;
2167         }
2168
2169       classes = nth_child_classes;
2170     }
2171   else
2172     classes = pseudo_classes;
2173
2174   for (i = 0; classes[i].name != NULL; i++)
2175     {
2176       if (g_ascii_strcasecmp (name, classes[i].name) == 0)
2177         {
2178           if ((*region_to_modify & classes[i].region_flag) ||
2179               (*state_to_modify & classes[i].state_flag))
2180             {
2181               if (classes == nth_child_classes)
2182                 gtk_css_provider_error (scanner->provider,
2183                                         scanner,
2184                                         GTK_CSS_PROVIDER_ERROR,
2185                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
2186                                         "Duplicate pseudo-class 'nth-child(%s)'", name);
2187               else
2188                 gtk_css_provider_error (scanner->provider,
2189                                         scanner,
2190                                         GTK_CSS_PROVIDER_ERROR,
2191                                         GTK_CSS_PROVIDER_ERROR_SYNTAX,
2192                                         "Duplicate pseudo-class '%s'", name);
2193             }
2194           *region_to_modify |= classes[i].region_flag;
2195           *state_to_modify |= classes[i].state_flag;
2196
2197           g_free (name);
2198           return TRUE;
2199         }
2200     }
2201
2202   if (classes == nth_child_classes)
2203     gtk_css_provider_error (scanner->provider,
2204                             scanner,
2205                             GTK_CSS_PROVIDER_ERROR,
2206                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2207                             "Unknown pseudo-class 'nth-child(%s)'", name);
2208   else
2209     gtk_css_provider_error (scanner->provider,
2210                             scanner,
2211                             GTK_CSS_PROVIDER_ERROR,
2212                             GTK_CSS_PROVIDER_ERROR_UNKNOWN_VALUE,
2213                             "Unknown pseudo-class '%s'", name);
2214   g_free (name);
2215   return FALSE;
2216 }
2217
2218 static gboolean
2219 parse_simple_selector (GtkCssScanner *scanner,
2220                        char **name,
2221                        GArray *ids,
2222                        GArray *classes,
2223                        GtkRegionFlags *pseudo_classes,
2224                        GtkStateFlags *state)
2225 {
2226   gboolean parsed_something;
2227
2228   *name = _gtk_css_parser_try_ident (scanner->parser, FALSE);
2229   if (*name)
2230     parsed_something = TRUE;
2231   else
2232     parsed_something = _gtk_css_parser_try (scanner->parser, "*", FALSE);
2233
2234   do {
2235       if (_gtk_css_parser_try (scanner->parser, "#", FALSE))
2236         {
2237           if (!parse_selector_name (scanner, ids))
2238             return FALSE;
2239         }
2240       else if (_gtk_css_parser_try (scanner->parser, ".", FALSE))
2241         {
2242           if (!parse_selector_class (scanner, classes))
2243             return FALSE;
2244         }
2245       else if (_gtk_css_parser_try (scanner->parser, ":", FALSE))
2246         {
2247           if (!parse_selector_pseudo_class (scanner, pseudo_classes, state))
2248             return FALSE;
2249         }
2250       else if (!parsed_something)
2251         {
2252           gtk_css_provider_error_literal (scanner->provider,
2253                                           scanner,
2254                                           GTK_CSS_PROVIDER_ERROR,
2255                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2256                                           "Expected a valid selector");
2257           return FALSE;
2258         }
2259       else
2260         break;
2261
2262       parsed_something = TRUE;
2263     }
2264   while (!_gtk_css_parser_is_eof (scanner->parser));
2265
2266   _gtk_css_parser_skip_whitespace (scanner->parser);
2267   return TRUE;
2268 }
2269
2270 static GtkCssSelector *
2271 parse_selector (GtkCssScanner *scanner)
2272 {
2273   GtkCssSelector *selector = NULL;
2274
2275   do {
2276       char *name = NULL;
2277       GArray *ids = g_array_new (TRUE, FALSE, sizeof (GQuark));
2278       GArray *classes = g_array_new (TRUE, FALSE, sizeof (GQuark));
2279       GtkRegionFlags pseudo_classes = 0;
2280       GtkStateFlags state = 0;
2281       GtkCssCombinator combine = GTK_CSS_COMBINE_DESCANDANT;
2282
2283       if (selector)
2284         {
2285           if (_gtk_css_parser_try (scanner->parser, ">", TRUE))
2286             combine = GTK_CSS_COMBINE_CHILD;
2287         }
2288
2289       if (!parse_simple_selector (scanner, &name, ids, classes, &pseudo_classes, &state))
2290         {
2291           g_array_free (ids, TRUE);
2292           g_array_free (classes, TRUE);
2293           if (selector)
2294             _gtk_css_selector_free (selector);
2295           return NULL;
2296         }
2297
2298       selector = _gtk_css_selector_new (selector,
2299                                         combine,
2300                                         name,
2301                                         (GQuark *) g_array_free (ids, ids->len == 0),
2302                                         (GQuark *) g_array_free (classes, classes->len == 0),
2303                                         pseudo_classes,
2304                                         state);
2305       g_free (name);
2306     }
2307   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2308          !_gtk_css_parser_begins_with (scanner->parser, ',') &&
2309          !_gtk_css_parser_begins_with (scanner->parser, '{'));
2310
2311   return selector;
2312 }
2313
2314 static GSList *
2315 parse_selector_list (GtkCssScanner *scanner)
2316 {
2317   GSList *selectors = NULL;
2318
2319   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_SELECTOR);
2320
2321   do {
2322       GtkCssSelector *select = parse_selector (scanner);
2323
2324       if (select == NULL)
2325         {
2326           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2327           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2328           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2329           return NULL;
2330         }
2331
2332       selectors = g_slist_prepend (selectors, select);
2333     }
2334   while (_gtk_css_parser_try (scanner->parser, ",", TRUE));
2335
2336   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2337
2338   return selectors;
2339 }
2340
2341 static void
2342 parse_declaration (GtkCssScanner *scanner,
2343                    GtkCssRuleset *ruleset)
2344 {
2345   GtkStyleProperty *property;
2346   char *name;
2347
2348   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DECLARATION);
2349
2350   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2351   if (name == NULL)
2352     goto check_for_semicolon;
2353
2354   property = _gtk_style_property_lookup (name);
2355   if (property == NULL && name[0] != '-')
2356     {
2357       gtk_css_provider_error (scanner->provider,
2358                               scanner,
2359                               GTK_CSS_PROVIDER_ERROR,
2360                               GTK_CSS_PROVIDER_ERROR_NAME,
2361                               "'%s' is not a valid property name",
2362                               name);
2363       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2364       g_free (name);
2365       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2366       return;
2367     }
2368
2369   if (!_gtk_css_parser_try (scanner->parser, ":", TRUE))
2370     {
2371       gtk_css_provider_invalid_token (scanner->provider, scanner, "':'");
2372       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2373       g_free (name);
2374       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2375       return;
2376     }
2377
2378   if (property)
2379     {
2380       PropertyValue *val;
2381
2382       g_free (name);
2383
2384       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2385
2386       val = property_value_new (scanner->section);
2387
2388       if (_gtk_style_property_parse_value (property,
2389                                            &val->value,
2390                                            scanner->parser,
2391                                            gtk_css_scanner_get_base_url (scanner)))
2392         {
2393           if (_gtk_css_parser_begins_with (scanner->parser, ';') ||
2394               _gtk_css_parser_begins_with (scanner->parser, '}') ||
2395               _gtk_css_parser_is_eof (scanner->parser))
2396             {
2397               gtk_css_ruleset_add (ruleset, property, val);
2398             }
2399           else
2400             {
2401               gtk_css_provider_error_literal (scanner->provider,
2402                                               scanner,
2403                                               GTK_CSS_PROVIDER_ERROR,
2404                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
2405                                               "Junk at end of value");
2406               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2407               property_value_free (val);
2408               gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2409               gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2410               return;
2411             }
2412         }
2413       else
2414         {
2415           property_value_free (val);
2416           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2417           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2418           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2419           return;
2420         }
2421       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2422     }
2423   else if (name[0] == '-')
2424     {
2425       char *value_str;
2426
2427       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2428
2429       value_str = _gtk_css_parser_read_value (scanner->parser);
2430       if (value_str)
2431         {
2432           PropertyValue *val;
2433
2434           val = property_value_new (scanner->section);
2435           g_value_init (&val->value, G_TYPE_STRING);
2436           g_value_take_string (&val->value, value_str);
2437
2438           gtk_css_ruleset_add_style (ruleset, name, val);
2439         }
2440       else
2441         {
2442           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2443           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2444           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2445           return;
2446         }
2447
2448       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2449     }
2450   else
2451     g_free (name);
2452
2453 check_for_semicolon:
2454   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2455
2456   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2457     {
2458       if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2459           !_gtk_css_parser_is_eof (scanner->parser))
2460         {
2461           gtk_css_provider_error_literal (scanner->provider,
2462                                           scanner,
2463                                           GTK_CSS_PROVIDER_ERROR,
2464                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2465                                           "Expected semicolon");
2466           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2467         }
2468     }
2469 }
2470
2471 static void
2472 parse_declarations (GtkCssScanner *scanner,
2473                     GtkCssRuleset *ruleset)
2474 {
2475   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2476          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2477     {
2478       parse_declaration (scanner, ruleset);
2479     }
2480 }
2481
2482 static void
2483 parse_ruleset (GtkCssScanner *scanner)
2484 {
2485   GSList *selectors;
2486   GtkCssRuleset ruleset = { 0, };
2487
2488   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_RULESET);
2489
2490   selectors = parse_selector_list (scanner);
2491   if (selectors == NULL)
2492     {
2493       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2494       return;
2495     }
2496
2497   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2498     {
2499       gtk_css_provider_error_literal (scanner->provider,
2500                                       scanner,
2501                                       GTK_CSS_PROVIDER_ERROR,
2502                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2503                                       "expected '{' after selectors");
2504       _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2505       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2506       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2507       return;
2508     }
2509
2510   parse_declarations (scanner, &ruleset);
2511
2512   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2513     {
2514       gtk_css_provider_error_literal (scanner->provider,
2515                                       scanner,
2516                                       GTK_CSS_PROVIDER_ERROR,
2517                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2518                                       "expected '}' after declarations");
2519       if (!_gtk_css_parser_is_eof (scanner->parser))
2520         {
2521           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2522           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2523           gtk_css_ruleset_clear (&ruleset);
2524           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2525         }
2526     }
2527
2528   css_provider_commit (scanner->provider, selectors, &ruleset);
2529   gtk_css_ruleset_clear (&ruleset);
2530   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2531 }
2532
2533 static void
2534 parse_statement (GtkCssScanner *scanner)
2535 {
2536   if (_gtk_css_parser_begins_with (scanner->parser, '@'))
2537     parse_at_keyword (scanner);
2538   else
2539     parse_ruleset (scanner);
2540 }
2541
2542 static void
2543 parse_stylesheet (GtkCssScanner *scanner)
2544 {
2545   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2546
2547   _gtk_css_parser_skip_whitespace (scanner->parser);
2548
2549   while (!_gtk_css_parser_is_eof (scanner->parser))
2550     {
2551       if (_gtk_css_parser_try (scanner->parser, "<!--", TRUE) ||
2552           _gtk_css_parser_try (scanner->parser, "-->", TRUE))
2553         continue;
2554
2555       parse_statement (scanner);
2556     }
2557
2558   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2559 }
2560
2561 static int
2562 gtk_css_provider_compare_rule (gconstpointer a_,
2563                                gconstpointer b_)
2564 {
2565   const GtkCssRuleset *a = (const GtkCssRuleset *) a_;
2566   const GtkCssRuleset *b = (const GtkCssRuleset *) b_;
2567   int compare;
2568
2569   compare = _gtk_css_selector_compare (a->selector, b->selector);
2570   if (compare != 0)
2571     return compare;
2572
2573   /* compare pointers in array to ensure a stable sort */
2574   if (a_ < b_)
2575     return -1;
2576
2577   if (a_ > b_)
2578     return 1;
2579
2580   return 0;
2581 }
2582
2583 static void
2584 gtk_css_provider_postprocess (GtkCssProvider *css_provider)
2585 {
2586   GtkCssProviderPrivate *priv = css_provider->priv;
2587
2588   g_array_sort (priv->rulesets, gtk_css_provider_compare_rule);
2589 }
2590
2591 static gboolean
2592 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
2593                                 GtkCssScanner  *parent,
2594                                 GFile          *file,
2595                                 const char     *text,
2596                                 GError        **error)
2597 {
2598   GtkCssScanner *scanner;
2599   gulong error_handler;
2600   char *free_data = NULL;
2601
2602   if (error)
2603     error_handler = g_signal_connect (css_provider,
2604                                       "parsing-error",
2605                                       G_CALLBACK (gtk_css_provider_propagate_error),
2606                                       error);
2607   else
2608     error_handler = 0; /* silence gcc */
2609
2610   if (text == NULL)
2611     {
2612       GError *load_error = NULL;
2613
2614       if (g_file_load_contents (file, NULL,
2615                                 &free_data, NULL,
2616                                 NULL, &load_error))
2617         {
2618           text = free_data;
2619         }
2620       else
2621         {
2622           GtkCssSection *section;
2623
2624           if (parent)
2625             section = gtk_css_section_ref (parent->section);
2626           else
2627             section = _gtk_css_section_new_for_file (GTK_CSS_SECTION_DOCUMENT, file);
2628
2629           gtk_css_provider_error (css_provider,
2630                                   parent,
2631                                   GTK_CSS_PROVIDER_ERROR,
2632                                   GTK_CSS_PROVIDER_ERROR_IMPORT,
2633                                   "Failed to import: %s",
2634                                   load_error->message);
2635
2636           gtk_css_section_unref (section);
2637         }
2638     }
2639
2640   if (text)
2641     {
2642       scanner = gtk_css_scanner_new (css_provider,
2643                                      parent,
2644                                      parent ? parent->section : NULL,
2645                                      file,
2646                                      text);
2647
2648       parse_stylesheet (scanner);
2649
2650       gtk_css_scanner_destroy (scanner);
2651
2652       if (parent == NULL)
2653         gtk_css_provider_postprocess (css_provider);
2654     }
2655
2656   g_free (free_data);
2657
2658   if (error)
2659     {
2660       g_signal_handler_disconnect (css_provider, error_handler);
2661
2662       if (*error)
2663         {
2664           /* We clear all contents from the provider for backwards compat reasons */
2665           gtk_css_provider_reset (css_provider);
2666           return FALSE;
2667         }
2668     }
2669
2670   return TRUE;
2671 }
2672
2673 /**
2674  * gtk_css_provider_load_from_data:
2675  * @css_provider: a #GtkCssProvider
2676  * @data: (array length=length) (element-type guint8): CSS data loaded in memory
2677  * @length: the length of @data in bytes, or -1 for NUL terminated strings. If
2678  *   @length is not -1, the code will assume it is not NUL terminated and will
2679  *   potentially do a copy.
2680  * @error: (out) (allow-none): return location for a #GError, or %NULL
2681  *
2682  * Loads @data into @css_provider, making it clear any previously loaded
2683  * information.
2684  *
2685  * Returns: %TRUE if the data could be loaded.
2686  **/
2687 gboolean
2688 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2689                                  const gchar     *data,
2690                                  gssize           length,
2691                                  GError         **error)
2692 {
2693   char *free_data;
2694   gboolean ret;
2695
2696   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2697   g_return_val_if_fail (data != NULL, FALSE);
2698
2699   if (length < 0)
2700     {
2701       length = strlen (data);
2702       free_data = NULL;
2703     }
2704   else
2705     {
2706       free_data = g_strndup (data, length);
2707       data = free_data;
2708     }
2709
2710   gtk_css_provider_reset (css_provider);
2711
2712   ret = gtk_css_provider_load_internal (css_provider, NULL, NULL, data, error);
2713
2714   g_free (free_data);
2715
2716   return ret;
2717 }
2718
2719 /**
2720  * gtk_css_provider_load_from_file:
2721  * @css_provider: a #GtkCssProvider
2722  * @file: #GFile pointing to a file to load
2723  * @error: (out) (allow-none): return location for a #GError, or %NULL
2724  *
2725  * Loads the data contained in @file into @css_provider, making it
2726  * clear any previously loaded information.
2727  *
2728  * Returns: %TRUE if the data could be loaded.
2729  **/
2730 gboolean
2731 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2732                                  GFile           *file,
2733                                  GError         **error)
2734 {
2735   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2736   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2737
2738   gtk_css_provider_reset (css_provider);
2739
2740   return gtk_css_provider_load_internal (css_provider, NULL, file, NULL, error);
2741 }
2742
2743 /**
2744  * gtk_css_provider_load_from_path:
2745  * @css_provider: a #GtkCssProvider
2746  * @path: the path of a filename to load, in the GLib filename encoding
2747  * @error: (out) (allow-none): return location for a #GError, or %NULL
2748  *
2749  * Loads the data contained in @path into @css_provider, making it clear
2750  * any previously loaded information.
2751  *
2752  * Returns: %TRUE if the data could be loaded.
2753  **/
2754 gboolean
2755 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2756                                  const gchar     *path,
2757                                  GError         **error)
2758 {
2759   GFile *file;
2760   gboolean result;
2761
2762   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2763   g_return_val_if_fail (path != NULL, FALSE);
2764
2765   file = g_file_new_for_path (path);
2766
2767   result = gtk_css_provider_load_from_file (css_provider, file, error);
2768
2769   g_object_unref (file);
2770
2771   return result;
2772 }
2773
2774 static gboolean
2775 _gtk_css_provider_load_from_resource (GtkCssProvider  *css_provider,
2776                                       const gchar     *resource_path)
2777 {
2778   GFile *file;
2779   char *uri, *escaped;
2780   gboolean result;
2781
2782   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2783   g_return_val_if_fail (resource_path != NULL, FALSE);
2784
2785   escaped = g_uri_escape_string (resource_path,
2786                                  G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, FALSE);
2787   uri = g_strconcat ("resource://", escaped, NULL);
2788   g_free (escaped);
2789
2790   file = g_file_new_for_uri (uri);
2791   g_free (uri);
2792
2793   result = gtk_css_provider_load_from_file (css_provider, file, NULL);
2794
2795   g_object_unref (file);
2796
2797   return result;
2798 }
2799
2800 /**
2801  * gtk_css_provider_get_default:
2802  *
2803  * Returns the provider containing the style settings used as a
2804  * fallback for all widgets.
2805  *
2806  * Returns: (transfer none): The provider used for fallback styling.
2807  *          This memory is owned by GTK+, and you must not free it.
2808  **/
2809 GtkCssProvider *
2810 gtk_css_provider_get_default (void)
2811 {
2812   static GtkCssProvider *provider;
2813
2814   if (G_UNLIKELY (!provider))
2815     {
2816       provider = gtk_css_provider_new ();
2817     }
2818
2819   return provider;
2820 }
2821
2822 gchar *
2823 _gtk_css_provider_get_theme_dir (void)
2824 {
2825   const gchar *var;
2826   gchar *path;
2827
2828   var = g_getenv ("GTK_DATA_PREFIX");
2829
2830   if (var)
2831     path = g_build_filename (var, "share", "themes", NULL);
2832   else
2833     path = g_build_filename (_gtk_get_data_prefix (), "share", "themes", NULL);
2834
2835   return path;
2836 }
2837
2838 /**
2839  * gtk_css_provider_get_named:
2840  * @name: A theme name
2841  * @variant: (allow-none): variant to load, for example, "dark", or
2842  *     %NULL for the default
2843  *
2844  * Loads a theme from the usual theme paths
2845  *
2846  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
2847  *     This memory is owned by GTK+, and you must not free it.
2848  */
2849 GtkCssProvider *
2850 gtk_css_provider_get_named (const gchar *name,
2851                             const gchar *variant)
2852 {
2853   static GHashTable *themes = NULL;
2854   GtkCssProvider *provider;
2855   gchar *key;
2856
2857   if (variant == NULL)
2858     key = (gchar *)name;
2859   else
2860     key = g_strconcat (name, "-", variant, NULL);
2861
2862   if (G_UNLIKELY (!themes))
2863     themes = g_hash_table_new (g_str_hash, g_str_equal);
2864
2865   provider = g_hash_table_lookup (themes, key);
2866
2867   if (!provider)
2868     {
2869       gchar *resource_path = NULL;
2870
2871       if (variant)
2872         resource_path = g_strdup_printf ("/org/gtk/libgtk/%s-%s.css", name, variant);
2873       else
2874         resource_path = g_strdup_printf ("/org/gtk/libgtk/%s.css", name);
2875
2876       if (g_resources_get_info (resource_path, 0, NULL, NULL, NULL))
2877         {
2878           provider = gtk_css_provider_new ();
2879           if (!_gtk_css_provider_load_from_resource (provider, resource_path))
2880             {
2881               g_object_unref (provider);
2882               provider = NULL;
2883             }
2884         }
2885       g_free (resource_path);
2886     }
2887
2888   if (!provider)
2889     {
2890       const gchar *home_dir;
2891       gchar *subpath, *path = NULL;
2892
2893       if (variant)
2894         subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
2895       else
2896         subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
2897
2898       /* First look in the users home directory
2899        */
2900       home_dir = g_get_home_dir ();
2901       if (home_dir)
2902         {
2903           path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
2904
2905           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2906             {
2907               g_free (path);
2908               path = NULL;
2909             }
2910         }
2911
2912       if (!path)
2913         {
2914           gchar *theme_dir;
2915
2916           theme_dir = _gtk_css_provider_get_theme_dir ();
2917           path = g_build_filename (theme_dir, name, subpath, NULL);
2918           g_free (theme_dir);
2919
2920           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2921             {
2922               g_free (path);
2923               path = NULL;
2924             }
2925         }
2926
2927       g_free (subpath);
2928
2929       if (path)
2930         {
2931           char *dir, *resource_file;
2932           GResource *resource;
2933
2934           provider = gtk_css_provider_new ();
2935
2936           dir = g_path_get_dirname (path);
2937           resource_file = g_build_filename (dir, "gtk.gresource", NULL);
2938           resource = g_resource_load (resource_file, NULL);
2939           if (resource != NULL)
2940             g_resources_register (resource);
2941
2942           if (!gtk_css_provider_load_from_path (provider, path, NULL))
2943             {
2944               if (resource != NULL)
2945                 {
2946                   g_resources_unregister (resource);
2947                   g_resource_unref (resource);
2948                 }
2949               g_object_unref (provider);
2950               provider = NULL;
2951             }
2952           else
2953             {
2954               /* Only set this after load success, as load_from_path will clear it */
2955               provider->priv->resource = resource;
2956               g_hash_table_insert (themes, g_strdup (key), provider);
2957             }
2958
2959           g_free (path);
2960           g_free (dir);
2961         }
2962     }
2963
2964   if (key != name)
2965     g_free (key);
2966
2967   return provider;
2968 }
2969
2970 static int
2971 compare_properties (gconstpointer a, gconstpointer b)
2972 {
2973   return strcmp (_gtk_style_property_get_name ((GtkStyleProperty *) a),
2974                  _gtk_style_property_get_name ((GtkStyleProperty *) b));
2975 }
2976
2977 static void
2978 gtk_css_ruleset_print (const GtkCssRuleset *ruleset,
2979                        GString             *str)
2980 {
2981   GList *keys, *walk;
2982
2983   _gtk_css_selector_print (ruleset->selector, str);
2984
2985   g_string_append (str, " {\n");
2986
2987   if (ruleset->style)
2988     {
2989       keys = g_hash_table_get_keys (ruleset->style);
2990       /* so the output is identical for identical selector styles */
2991       keys = g_list_sort (keys, compare_properties);
2992
2993       for (walk = keys; walk; walk = walk->next)
2994         {
2995           GtkCssStyleProperty *prop = walk->data;
2996           const PropertyValue *value = g_hash_table_lookup (ruleset->style, prop);
2997
2998           g_string_append (str, "  ");
2999           g_string_append (str, _gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop)));
3000           g_string_append (str, ": ");
3001           _gtk_css_style_property_print_value (prop, &value->value, str);
3002           g_string_append (str, ";\n");
3003         }
3004
3005       g_list_free (keys);
3006     }
3007
3008   if (ruleset->widget_style)
3009     {
3010       keys = g_hash_table_get_keys (ruleset->widget_style);
3011       /* so the output is identical for identical selector styles */
3012       keys = g_list_sort (keys, (GCompareFunc) strcmp);
3013
3014       for (walk = keys; walk; walk = walk->next)
3015         {
3016           const char *name = walk->data;
3017           const PropertyValue *value = g_hash_table_lookup (ruleset->widget_style, (gpointer) name);
3018
3019           g_string_append (str, "  ");
3020           g_string_append (str, name);
3021           g_string_append (str, ": ");
3022           g_string_append (str, g_value_get_string (&value->value));
3023           g_string_append (str, ";\n");
3024         }
3025
3026       g_list_free (keys);
3027     }
3028
3029   g_string_append (str, "}\n");
3030 }
3031
3032 static void
3033 gtk_css_provider_print_colors (GHashTable *colors,
3034                                GString    *str)
3035 {
3036   GList *keys, *walk;
3037   char *s;
3038
3039   keys = g_hash_table_get_keys (colors);
3040   /* so the output is identical for identical styles */
3041   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3042
3043   for (walk = keys; walk; walk = walk->next)
3044     {
3045       const char *name = walk->data;
3046       GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
3047
3048       g_string_append (str, "@define-color ");
3049       g_string_append (str, name);
3050       g_string_append (str, " ");
3051       s = gtk_symbolic_color_to_string (symbolic);
3052       g_string_append (str, s);
3053       g_free (s);
3054       g_string_append (str, ";\n");
3055     }
3056
3057   g_list_free (keys);
3058 }
3059
3060 /**
3061  * gtk_css_provider_to_string:
3062  * @provider: the provider to write to a string
3063  *
3064  * Convertes the @provider into a string representation in CSS
3065  * format.
3066  *
3067  * Using gtk_css_provider_load_from_data() with the return value
3068  * from this function on a new provider created with
3069  * gtk_css_provider_new() will basicallu create a duplicate of
3070  * this @provider.
3071  *
3072  * Returns: a new string representing the @provider.
3073  *
3074  * Since: 3.2
3075  **/
3076 char *
3077 gtk_css_provider_to_string (GtkCssProvider *provider)
3078 {
3079   GtkCssProviderPrivate *priv;
3080   GString *str;
3081   guint i;
3082
3083   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
3084
3085   priv = provider->priv;
3086
3087   str = g_string_new ("");
3088
3089   gtk_css_provider_print_colors (priv->symbolic_colors, str);
3090
3091   for (i = 0; i < priv->rulesets->len; i++)
3092     {
3093       if (i > 0)
3094         g_string_append (str, "\n");
3095       gtk_css_ruleset_print (&g_array_index (priv->rulesets, GtkCssRuleset, i), str);
3096     }
3097
3098   return g_string_free (str, FALSE);
3099 }
3100