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

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