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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "config.h"
  19
  20 #include <string.h>
  21 #include <stdlib.h>
  22
  23 #include <gdk-pixbuf/gdk-pixbuf.h>
  24 #include <cairo-gobject.h>
  25
  26 #include "gtkcssproviderprivate.h"
  27
  28 #include "gtkbitmaskprivate.h"
  29 #include "gtkcssstylefuncsprivate.h"
  30 #include "gtkcssparserprivate.h"
  31 #include "gtkcsssectionprivate.h"
  32 #include "gtkcssselectorprivate.h"
  33 #include "gtkcssshorthandpropertyprivate.h"
  34 #include "gtksymboliccolor.h"
  35 #include "gtkstyleprovider.h"
  36 #include "gtkstylecontextprivate.h"
  37 #include "gtkstylepropertiesprivate.h"
  38 #include "gtkstylepropertyprivate.h"
  39 #include "gtkstyleproviderprivate.h"
  40 #include "gtkbindings.h"
  41 #include "gtkmarshalers.h"
  42 #include "gtkprivate.h"
  43 #include "gtkintl.h"
  44
  45 /**
  46  * SECTION:gtkcssprovider
  47  * @Short_description: CSS-like styling for widgets
  48  * @Title: GtkCssProvider
  49  * @See_also: #GtkStyleContext, #GtkStyleProvider
  50  *
  51  * GtkCssProvider is an object implementing the #GtkStyleProvider interface.
  52  * It is able to parse <ulink url="http://www.w3.org/TR/CSS2">CSS</ulink>-like
  53  * input in order to style widgets.
  54  *
  55  * <refsect2 id="gtkcssprovider-files">
  56  * <title>Default files</title>
  57  * <para>
  58  * An application can cause GTK+ to parse a specific CSS style sheet by
  59  * calling gtk_css_provider_load_from_file() and adding the provider with
  60  * gtk_style_context_add_provider() or gtk_style_context_add_provider_for_screen().
  61  * In addition, certain files will be read when GTK+ is initialized. First,
  62  * the file <filename><envar>$XDG_CONFIG_HOME</envar>/gtk-3.0/gtk.css</filename>
  63  * is loaded if it exists. Then, GTK+ tries to load
  64  * <filename><envar>$HOME</envar>/.themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  65  * falling back to
  66  * <filename><replaceable>datadir</replaceable>/share/themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  67  * where <replaceable>theme-name</replaceable> is the name of the current theme
  68  * (see the #GtkSettings:gtk-theme-name setting) and <replaceable>datadir</replaceable>
  69  * is the prefix configured when GTK+ was compiled, unless overridden by the
  70  * <envar>GTK_DATA_PREFIX</envar> environment variable.
  71  * </para>
  72  * </refsect2>
  73  * <refsect2 id="gtkcssprovider-stylesheets">
  74  * <title>Style sheets</title>
  75  * <para>
  76  * The basic structure of the style sheets understood by this provider is
  77  * a series of statements, which are either rule sets or '@-rules', separated
  78  * by whitespace.
  79  * </para>
  80  * <para>
  81  * A rule set consists of a selector and a declaration block, which is
  82  * a series of declarations enclosed in curly braces ({ and }). The
  83  * declarations are separated by semicolons (;). Multiple selectors can
  84  * share the same declaration block, by putting all the separators in
  85  * front of the block, separated by commas.
  86  * </para>
  87  * <example><title>A rule set with two selectors</title>
  88  * <programlisting language="text">
  89  * GtkButton, GtkEntry {
  90  *     color: &num;ff00ea;
  91  *     font: Comic Sans 12
  92  * }
  93  * </programlisting>
  94  * </example>
  95  * </refsect2>
  96  * <refsect2 id="gtkcssprovider-selectors">
  97  * <title>Selectors</title>
  98  * <para>
  99  * Selectors work very similar to the way they do in CSS, with widget class
 100  * names taking the role of element names, and widget names taking the role
 101  * of IDs. When used in a selector, widget names must be prefixed with a
 102  * '&num;' character. The '*' character represents the so-called universal
 103  * selector, which matches any widget.
 104  * </para>
 105  * <para>
 106  * To express more complicated situations, selectors can be combined in
 107  * various ways:
 108  * <itemizedlist>
 109  * <listitem><para>To require that a widget satisfies several conditions,
 110  *   combine several selectors into one by concatenating them. E.g.
 111  *   <literal>GtkButton&num;button1</literal> matches a GtkButton widget
 112  *   with the name button1.</para></listitem>
 113  * <listitem><para>To only match a widget when it occurs inside some other
 114  *   widget, write the two selectors after each other, separated by whitespace.
 115  *   E.g. <literal>GtkToolBar GtkButton</literal> matches GtkButton widgets
 116  *   that occur inside a GtkToolBar.</para></listitem>
 117  * <listitem><para>In the previous example, the GtkButton is matched even
 118  *   if it occurs deeply nested inside the toolbar. To restrict the match
 119  *   to direct children of the parent widget, insert a '>' character between
 120  *   the two selectors. E.g. <literal>GtkNotebook > GtkLabel</literal> matches
 121  *   GtkLabel widgets that are direct children of a GtkNotebook.</para></listitem>
 122  * </itemizedlist>
 123  * </para>
 124  * <example>
 125  * <title>Widget classes and names in selectors</title>
 126  * <programlisting language="text">
 127  * /&ast; Theme labels that are descendants of a window &ast;/
 128  * GtkWindow GtkLabel {
 129  *     background-color: &num;898989
 130  * }
 131  *
 132  * /&ast; Theme notebooks, and anything that's within these &ast;/
 133  * GtkNotebook {
 134  *     background-color: &num;a939f0
 135  * }
 136  *
 137  * /&ast; Theme combo boxes, and entries that
 138  *  are direct children of a notebook &ast;/
 139  * GtkComboBox,
 140  * GtkNotebook > GtkEntry {
 141  *     color: @fg_color;
 142  *     background-color: &num;1209a2
 143  * }
 144  *
 145  * /&ast; Theme any widget within a GtkBin &ast;/
 146  * GtkBin * {
 147  *     font: Sans 20
 148  * }
 149  *
 150  * /&ast; Theme a label named title-label &ast;/
 151  * GtkLabel&num;title-label {
 152  *     font: Sans 15
 153  * }
 154  *
 155  * /&ast; Theme any widget named main-entry &ast;/
 156  * &num;main-entry {
 157  *     background-color: &num;f0a810
 158  * }
 159  * </programlisting>
 160  * </example>
 161  * <para>
 162  * Widgets may also define style classes, which can be used for matching.
 163  * When used in a selector, style classes must be prefixed with a '.'
 164  * character.
 165  * </para>
 166  * <para>
 167  * Refer to the documentation of individual widgets to learn which
 168  * style classes they define and see <xref linkend="gtkstylecontext-classes"/>
 169  * for a list of all style classes used by GTK+ widgets.
 170  * </para>
 171  * <para>
 172  * Note that there is some ambiguity in the selector syntax when it comes
 173  * to differentiation widget class names from regions. GTK+ currently treats
 174  * a string as a widget class name if it contains any uppercase characters
 175  * (which should work for more widgets with names like GtkLabel).
 176  * </para>
 177  * <example>
 178  * <title>Style classes in selectors</title>
 179  * <programlisting language="text">
 180  * /&ast; Theme all widgets defining the class entry &ast;/
 181  * .entry {
 182  *     color: &num;39f1f9;
 183  * }
 184  *
 185  * /&ast; Theme spinbuttons' entry &ast;/
 186  * GtkSpinButton.entry {
 187  *     color: &num;900185
 188  * }
 189  * </programlisting>
 190  * </example>
 191  * <para>
 192  * In complicated widgets like e.g. a GtkNotebook, it may be desirable
 193  * to style different parts of the widget differently. To make this
 194  * possible, container widgets may define regions, whose names
 195  * may be used for matching in selectors.
 196  * </para>
 197  * <para>
 198  * Some containers allow to further differentiate between regions by
 199  * applying so-called pseudo-classes to the region. For example, the
 200  * tab region in GtkNotebook allows to single out the first or last
 201  * tab by using the :first-child or :last-child pseudo-class.
 202  * When used in selectors, pseudo-classes must be prefixed with a
 203  * ':' character.
 204  * </para>
 205  * <para>
 206  * Refer to the documentation of individual widgets to learn which
 207  * regions and pseudo-classes they define and see
 208  * <xref linkend="gtkstylecontext-classes"/> for a list of all regions
 209  * used by GTK+ widgets.
 210  * </para>
 211  * <example>
 212  * <title>Regions in selectors</title>
 213  * <programlisting language="text">
 214  * /&ast; Theme any label within a notebook &ast;/
 215  * GtkNotebook GtkLabel {
 216  *     color: &num;f90192;
 217  * }
 218  *
 219  * /&ast; Theme labels within notebook tabs &ast;/
 220  * GtkNotebook tab GtkLabel {
 221  *     color: &num;703910;
 222  * }
 223  *
 224  * /&ast; Theme labels in the any first notebook
 225  *  tab, both selectors are equivalent &ast;/
 226  * GtkNotebook tab:nth-child(first) GtkLabel,
 227  * GtkNotebook tab:first-child GtkLabel {
 228  *     color: &num;89d012;
 229  * }
 230  * </programlisting>
 231  * </example>
 232  * <para>
 233  * Another use of pseudo-classes is to match widgets depending on their
 234  * state. This is conceptually similar to the :hover, :active or :focus
 235  * pseudo-classes in CSS. The available pseudo-classes for widget states
 236  * are :active, :prelight (or :hover), :insensitive, :selected, :focused
 237  * and :inconsistent.
 238  * </para>
 239  * <example>
 240  * <title>Styling specific widget states</title>
 241  * <programlisting language="text">
 242  * /&ast; Theme active (pressed) buttons &ast;/
 243  * GtkButton:active {
 244  *     background-color: &num;0274d9;
 245  * }
 246  *
 247  * /&ast; Theme buttons with the mouse pointer on it,
 248  *    both are equivalent &ast;/
 249  * GtkButton:hover,
 250  * GtkButton:prelight {
 251  *     background-color: &num;3085a9;
 252  * }
 253  *
 254  * /&ast; Theme insensitive widgets, both are equivalent &ast;/
 255  * :insensitive,
 256  * *:insensitive {
 257  *     background-color: &num;320a91;
 258  * }
 259  *
 260  * /&ast; Theme selection colors in entries &ast;/
 261  * GtkEntry:selected {
 262  *     background-color: &num;56f9a0;
 263  * }
 264  *
 265  * /&ast; Theme focused labels &ast;/
 266  * GtkLabel:focused {
 267  *     background-color: &num;b4940f;
 268  * }
 269  *
 270  * /&ast; Theme inconsistent checkbuttons &ast;/
 271  * GtkCheckButton:inconsistent {
 272  *     background-color: &num;20395a;
 273  * }
 274  * </programlisting>
 275  * </example>
 276  * <para>
 277  * Widget state pseudoclasses may only apply to the last element
 278  * in a selector.
 279  * </para>
 280  * <para>
 281  * To determine the effective style for a widget, all the matching rule
 282  * sets are merged. As in CSS, rules apply by specificity, so the rules
 283  * whose selectors more closely match a widget path will take precedence
 284  * over the others.
 285  * </para>
 286  * </refsect2>
 287  * <refsect2 id="gtkcssprovider-rules">
 288  * <title>&commat; Rules</title>
 289  * <para>
 290  * GTK+'s CSS supports the &commat;import rule, in order to load another
 291  * CSS style sheet in addition to the currently parsed one.
 292  * </para>
 293  * <example>
 294  * <title>Using the &commat;import rule</title>
 295  * <programlisting language="text">
 296  * &commat;import url ("path/to/common.css");
 297  * </programlisting>
 298  * </example>
 299  * <para id="css-binding-set">
 300  * In order to extend key bindings affecting different widgets, GTK+
 301  * supports the &commat;binding-set rule to parse a set of bind/unbind
 302  * directives, see #GtkBindingSet for the supported syntax. Note that
 303  * the binding sets defined in this way must be associated with rule sets
 304  * by setting the gtk-key-bindings style property.
 305  * </para>
 306  * <para>
 307  * Customized key bindings are typically defined in a separate
 308  * <filename>gtk-keys.css</filename> CSS file and GTK+ loads this file
 309  * according to the current key theme, which is defined by the
 310  * #GtkSettings:gtk-key-theme-name setting.
 311  * </para>
 312  * <example>
 313  * <title>Using the &commat;binding rule</title>
 314  * <programlisting language="text">
 315  * &commat;binding-set binding-set1 {
 316  *   bind "&lt;alt&gt;Left" { "move-cursor" (visual-positions, -3, 0) };
 317  *   unbind "End";
 318  * };
 319  *
 320  * &commat;binding-set binding-set2 {
 321  *   bind "&lt;alt&gt;Right" { "move-cursor" (visual-positions, 3, 0) };
 322  *   bind "&lt;alt&gt;KP_space" { "delete-from-cursor" (whitespace, 1)
 323  *                          "insert-at-cursor" (" ") };
 324  * };
 325  *
 326  * GtkEntry {
 327  *   gtk-key-bindings: binding-set1, binding-set2;
 328  * }
 329  * </programlisting>
 330  * </example>
 331  * <para>
 332  * GTK+ also supports an additional &commat;define-color rule, in order
 333  * to define a color name which may be used instead of color numeric
 334  * representations. Also see the #GtkSettings:gtk-color-scheme setting
 335  * for a way to override the values of these named colors.
 336  * </para>
 337  * <example>
 338  * <title>Defining colors</title>
 339  * <programlisting language="text">
 340  * &commat;define-color bg_color &num;f9a039;
 341  *
 342  * &ast; {
 343  *     background-color: &commat;bg_color;
 344  * }
 345  * </programlisting>
 346  * </example>
 347  * </refsect2>
 348  * <refsect2 id="gtkcssprovider-symbolic-colors">
 349  * <title>Symbolic colors</title>
 350  * <para>
 351  * Besides being able to define color names, the CSS parser is also able
 352  * to read different color expressions, which can also be nested, providing
 353  * a rich language to define colors which are derived from a set of base
 354  * colors.
 355  * </para>
 356  * <example>
 357  * <title>Using symbolic colors</title>
 358  * <programlisting language="text">
 359  * &commat;define-color entry-color shade (&commat;bg_color, 0.7);
 360  *
 361  * GtkEntry {
 362  *     background-color: @entry-color;
 363  * }
 364  *
 365  * GtkEntry:focused {
 366  *     background-color: mix (&commat;entry-color,
 367  *                            shade (&num;fff, 0.5),
 368  *                            0.8);
 369  * }
 370  * </programlisting>
 371  * </example>
 372  * <para>
 373  *   The various ways to express colors in GTK+ CSS are:
 374  * </para>
 375  * <informaltable>
 376  *   <tgroup cols="3">
 377  *     <thead>
 378  *       <row>
 379  *         <entry>Syntax</entry>
 380  *         <entry>Explanation</entry>
 381  *         <entry>Examples</entry>
 382  *       </row>
 383  *     </thead>
 384  *     <tbody>
 385  *       <row>
 386  *         <entry>rgb(@r, @g, @b)</entry>
 387  *         <entry>An opaque color; @r, @g, @b can be either integers between
 388  *                0 and 255 or percentages</entry>
 389  *         <entry><literallayout>rgb(128, 10, 54)
 390  * rgb(20%, 30%, 0%)</literallayout></entry>
 391  *       </row>
 392  *       <row>
 393  *         <entry>rgba(@r, @g, @b, @a)</entry>
 394  *         <entry>A translucent color; @r, @g, @b are as in the previous row,
 395  *                @a is a floating point number between 0 and 1</entry>
 396  *         <entry><literallayout>rgba(255, 255, 0, 0.5)</literallayout></entry>
 397  *       </row>
 398  *       <row>
 399  *         <entry>&num;@xxyyzz</entry>
 400  *         <entry>An opaque color; @xx, @yy, @zz are hexadecimal numbers
 401  *                specifying @r, @g, @b variants with between 1 and 4
 402  *                hexadecimal digits per component are allowed</entry>
 403  *         <entry><literallayout>&num;ff12ab
 404  * &num;f0c</literallayout></entry>
 405  *       </row>
 406  *       <row>
 407  *         <entry>&commat;name</entry>
 408  *         <entry>Reference to a color that has been defined with
 409  *                &commat;define-color
 410  *         </entry>
 411  *         <entry>&commat;bg_color</entry>
 412  *       </row>
 413  *       <row>
 414  *         <entry>mix(@color1, @color2, @f)</entry>
 415  *         <entry>A linear combination of @color1 and @color2. @f is a
 416  *                floating point number between 0 and 1.</entry>
 417  *         <entry><literallayout>mix(&num;ff1e0a, &commat;bg_color, 0.8)</literallayout></entry>
 418  *       </row>
 419  *       <row>
 420  *         <entry>shade(@color, @f)</entry>
 421  *         <entry>A lighter or darker variant of @color. @f is a
 422  *                floating point number.
 423  *         </entry>
 424  *         <entry>shade(&commat;fg_color, 0.5)</entry>
 425  *       </row>
 426  *       <row>
 427  *         <entry>lighter(@color)</entry>
 428  *         <entry>A lighter variant of @color</entry>
 429  *       </row>
 430  *       <row>
 431  *         <entry>darker(@color)</entry>
 432  *         <entry>A darker variant of @color</entry>
 433  *       </row>
 434  *       <row>
 435  *         <entry>alpha(@color, @f)</entry>
 436  *         <entry>Modifies passed color's alpha by a factor @f. @f is a
 437  *                floating point number. @f < 1.0 results in a more transparent
 438  *                color while @f > 1.0 results in a more opaque color.
 439  *         </entry>
 440  *         <entry>alhpa(blue, 0.5)</entry>
 441  *       </row>
 442  *     </tbody>
 443  *   </tgroup>
 444  * </informaltable>
 445  * </refsect2>
 446  * <refsect2 id="gtkcssprovider-gradients">
 447  * <title>Gradients</title>
 448  * <para>
 449  * Linear or radial Gradients can be used as background images.
 450  * </para>
 451  * <para>
 452  * A linear gradient along the line from (@start_x, @start_y) to
 453  * (@end_x, @end_y) is specified using the syntax
 454  * <literallayout>-gtk-gradient (linear,
 455  *               @start_x @start_y, @end_x @end_y,
 456  *               color-stop (@position, @color),
 457  *               ...)</literallayout>
 458  * where @start_x and @end_x can be either a floating point number between
 459  * 0 and 1 or one of the special values 'left', 'right' or 'center', @start_y
 460  * and @end_y can be either a floating point number between 0 and 1 or one
 461  * of the special values 'top', 'bottom' or 'center', @position is a floating
 462  * point number between 0 and 1 and @color is a color expression (see above).
 463  * The color-stop can be repeated multiple times to add more than one color
 464  * stop. 'from (@color)' and 'to (@color)' can be used as abbreviations for
 465  * color stops with position 0 and 1, respectively.
 466  * </para>
 467  * <example>
 468  * <title>A linear gradient</title>
 469  * <inlinegraphic fileref="gradient1.png" format="PNG"/>
 470  * <para>This gradient was specified with
 471  * <literallayout>-gtk-gradient (linear,
 472  *                left top, right bottom,
 473  *                from(&commat;yellow), to(&commat;blue))</literallayout></para>
 474  * </example>
 475  * <example>
 476  * <title>Another linear gradient</title>
 477  * <inlinegraphic fileref="gradient2.png" format="PNG"/>
 478  * <para>This gradient was specified with
 479  * <literallayout>-gtk-gradient (linear,
 480  *                0 0, 0 1,
 481  *                color-stop(0, &commat;yellow),
 482  *                color-stop(0.2, &commat;blue),
 483  *                color-stop(1, &num;0f0))</literallayout></para>
 484  * </example>
 485  * <para>
 486  * A radial gradient along the two circles defined by (@start_x, @start_y,
 487  * @start_radius) and (@end_x, @end_y, @end_radius) is specified using the
 488  * syntax
 489  * <literallayout>-gtk-gradient (radial,
 490  *                @start_x @start_y, @start_radius,
 491  *                @end_x @end_y, @end_radius,
 492  *                color-stop (@position, @color),
 493  *                ...)</literallayout>
 494  * where @start_radius and @end_radius are floating point numbers and
 495  * the other parameters are as before.
 496  * </para>
 497  * <example>
 498  * <title>A radial gradient</title>
 499  * <inlinegraphic fileref="gradient3.png" format="PNG"/>
 500  * <para>This gradient was specified with
 501  * <literallayout>-gtk-gradient (radial,
 502  *                center center, 0,
 503  *                center center, 1,
 504  *                from(&commat;yellow), to(&commat;green))</literallayout></para>
 505  * </example>
 506  * <example>
 507  * <title>Another radial gradient</title>
 508  * <inlinegraphic fileref="gradient4.png" format="PNG"/>
 509  * <para>This gradient was specified with
 510  * <literallayout>-gtk-gradient (radial,
 511  *                0.4 0.4, 0.1,
 512  *                0.6 0.6, 0.7,
 513  *                color-stop (0, &num;f00),
 514  *                color-stop (0.1, &num;a0f),
 515  *                color-stop (0.2, &commat;yellow),
 516  *                color-stop (1, &commat;green))</literallayout></para>
 517  * </example>
 518  * </refsect2>
 519  * <refsect2 id="gtkcssprovider-shadows">
 520  * <title>Text shadow</title>
 521  * <para>
 522  * A shadow list can be applied to text or symbolic icons, using the CSS3
 523  * text-shadow syntax, as defined in
 524  * <ulink url="http://www.w3.org/TR/css3-text/#text-shadow">the CSS3 specification</ulink>.
 525  * </para>
 526  * <para>
 527  * A text shadow is specified using the syntax
 528  * <literallayout>text-shadow: @horizontal_offset @vertical_offset [ @blur_radius ] @color</literallayout>
 529  * The offset of the shadow is specified with the @horizontal_offset and @vertical_offset
 530  * parameters. The optional blur radius is parsed, but it is currently not rendered by
 531  * the GTK+ theming engine.
 532  * </para>
 533  * <para>
 534  * To set multiple shadows on an element, you can specify a comma-separated list
 535  * of shadow elements in the text-shadow property. Shadows are always rendered
 536  * front-back, i.e. the first shadow specified is on top of the others. Shadows
 537  * can thus overlay each other, but they can never overlay the text itself,
 538  * which is always rendered on top of the shadow layer.
 539  * </para>
 540  * </refsect2>
 541  * <refsect2>
 542  * <title>Box shadow</title>
 543  * <para>
 544  * Themes can apply shadows on framed elements using the CSS3 box-shadow syntax,
 545  * as defined in
 546  * <ulink url="http://www.w3.org/TR/css3-background/#the-box-shadow">the CSS3 specification</ulink>.
 547  * </para>
 548  * <para>
 549  * A box shadow is specified using the syntax
 550  * <literallayout>box-shadow: [ @inset ] @horizontal_offset @vertical_offset [ @blur_radius ] [ @spread ] @color</literallayout>
 551  * A positive offset will draw a shadow that is offset to the right (down) of the box,
 552  * a negative offset to the left (top). The optional spread parameter defines an additional
 553  * distance to expand the shadow shape in all directions, by the specified radius.
 554  * The optional blur radius parameter is parsed, but it is currently not rendered by
 555  * the GTK+ theming engine.
 556  * The inset parameter defines whether the drop shadow should be rendered inside or outside
 557  * the box canvas. Only inset box-shadows are currently supported by the GTK+ theming engine,
 558  * non-inset elements are currently ignored.
 559  * </para>
 560  * <para>
 561  * To set multiple box-shadows on an element, you can specify a comma-separated list
 562  * of shadow elements in the box-shadow property. Shadows are always rendered
 563  * front-back, i.e. the first shadow specified is on top of the others, so they may
 564  * overlap other boxes or other shadows.
 565  * </para>
 566  * </refsect2>
 567  * <refsect2 id="gtkcssprovider-border-image">
 568  * <title>Border images</title>
 569  * <para>
 570  * Images and gradients can also be used in slices for the purpose of creating
 571  * scalable borders.
 572  * For more information, see the CSS3 documentation for the border-image property,
 573  * which can be found <ulink url="http://www.w3.org/TR/css3-background/#border-images">here</ulink>.
 574  * </para>
 575  * <inlinegraphic fileref="slices.png" format="PNG"/>
 576  * <para>
 577  * The parameters of the slicing process are controlled by
 578  * four separate properties. Note that you can use the
 579  * <literallayout>border-image</literallayout> shorthand property
 580  * to set values for the three properties at the same time.
 581  * </para>
 582  * <para>
 583  * <literallayout>border-image-source: url(@path)
 584  * (or border-image-source: -gtk-gradient(...))</literallayout>:
 585  * Specifies the source of the border image, and it can either
 586  * be an URL or a gradient (see above).
 587  * </para>
 588  * <para>
 589  * <literallayout>border-image-slice: @top @right @bottom @left</literallayout>
 590  * The sizes specified by the @top, @right, @bottom and @left parameters
 591  * are the offsets, in pixels, from the relevant edge where the image
 592  * should be "cut off" to build the slices used for the rendering
 593  * of the border.
 594  * </para>
 595  * <para>
 596  * <literallayout>border-image-width: @top @right @bottom @left</literallayout>
 597  * The sizes specified by the @top, @right, @bottom and @left parameters
 598  * are inward distances from the border box edge, used to specify the
 599  * rendered size of each slice determined by border-image-slice.
 600  * If this property is not specified, the values of border-width will
 601  * be used as a fallback.
 602  * </para>
 603  * <para>
 604  * <literallayout>border-image-repeat: [stretch|repeat|round|space] ?
 605  * [stretch|repeat|round|space]</literallayout>
 606  * Specifies how the image slices should be rendered in the area
 607  * outlined by border-width.
 608  * The default (stretch) is to resize the slice to fill in the whole
 609  * allocated area.
 610  * If the value of this property is 'repeat', the image slice
 611  * will be tiled to fill the area.
 612  * If the value of this property is 'round', the image slice will
 613  * be tiled to fill the area, and scaled to fit it exactly
 614  * a whole number of times.
 615  * If the value of this property is 'space', the image slice will
 616  * be tiled to fill the area, and if it doesn't fit it exactly a whole
 617  * number of times, the extra space is distributed as padding around
 618  * the slices.
 619  * If two options are specified, the first one affects
 620  * the horizontal behaviour and the second one the vertical behaviour.
 621  * If only one option is specified, it affects both.
 622  * </para>
 623  * <example>
 624  * <title>A border image</title>
 625  * <inlinegraphic fileref="border1.png" format="PNG"/>
 626  * <para>This border image was specified with
 627  * <literallayout>url("gradient1.png") 10 10 10 10</literallayout>
 628  * </para>
 629  * </example>
 630  * <example>
 631  * <title>A repeating border image</title>
 632  * <inlinegraphic fileref="border2.png" format="PNG"/>
 633  * <para>This border image was specified with
 634  * <literallayout>url("gradient1.png") 10 10 10 10 repeat</literallayout>
 635  * </para>
 636  * </example>
 637  * <example>
 638  * <title>A stretched border image</title>
 639  * <inlinegraphic fileref="border3.png" format="PNG"/>
 640  * <para>This border image was specified with
 641  * <literallayout>url("gradient1.png") 10 10 10 10 stretch</literallayout>
 642  * </para>
 643  * </example>
 644  * </refsect2>
 645  * <refsect2 id="gtkcssprovider-transitions">
 646  * <para>Styles can specify transitions that will be used to create a gradual
 647  * change in the appearance when a widget state changes. The following
 648  * syntax is used to specify transitions:
 649  * <literallayout>@duration [s|ms] [linear|ease|ease-in|ease-out|ease-in-out] [loop]?</literallayout>
 650  * The @duration is the amount of time that the animation will take for
 651  * a complete cycle from start to end. If the loop option is given, the
 652  * animation will be repated until the state changes again.
 653  * The option after the duration determines the transition function from a
 654  * small set of predefined functions.
 655  * <figure><title>Linear transition</title>
 656  * <graphic fileref="linear.png" format="PNG"/>
 657  * </figure>
 658  * <figure><title>Ease transition</title>
 659  * <graphic fileref="ease.png" format="PNG"/>
 660  * </figure>
 661  * <figure><title>Ease-in-out transition</title>
 662  * <graphic fileref="ease-in-out.png" format="PNG"/>
 663  * </figure>
 664  * <figure><title>Ease-in transition</title>
 665  * <graphic fileref="ease-in.png" format="PNG"/>
 666  * </figure>
 667  * <figure><title>Ease-out transition</title>
 668  * <graphic fileref="ease-out.png" format="PNG"/>
 669  * </figure>
 670  * </para>
 671  * </refsect2>
 672  * <refsect2 id="gtkcssprovider-properties">
 673  * <title>Supported properties</title>
 674  * <para>
 675  * Properties are the part that differ the most to common CSS,
 676  * not all properties are supported (some are planned to be
 677  * supported eventually, some others are meaningless or don't
 678  * map intuitively in a widget based environment).
 679  * </para>
 680  * <para>
 681  * The currently supported properties are:
 682  * </para>
 683  * <informaltable>
 684  *   <tgroup cols="4">
 685  *     <thead>
 686  *       <row>
 687  *         <entry>Property name</entry>
 688  *         <entry>Syntax</entry>
 689  *         <entry>Maps to</entry>
 690  *         <entry>Examples</entry>
 691  *       </row>
 692  *     </thead>
 693  *     <tbody>
 694  *       <row>
 695  *         <entry>engine</entry>
 696  *         <entry>engine-name</entry>
 697  *         <entry>#GtkThemingEngine</entry>
 698  *         <entry>engine: clearlooks;
 699  *  engine: none; /&ast; use the default (i.e. builtin) engine) &ast;/ </entry>
 700  *       </row>
 701  *       <row>
 702  *         <entry>background-color</entry>
 703  *         <entry morerows="2">color (see above)</entry>
 704  *         <entry morerows="7">#GdkRGBA</entry>
 705  *         <entry morerows="7"><literallayout>background-color: &num;fff;
 706  * color: &amp;color1;
 707  * background-color: shade (&amp;color1, 0.5);
 708  * color: mix (&amp;color1, &num;f0f, 0.8);</literallayout>
 709  *         </entry>
 710  *       </row>
 711  *       <row>
 712  *         <entry>color</entry>
 713  *       </row>
 714  *       <row>
 715  *         <entry>border-top-color</entry>
 716  *         <entry morerows="4">transparent|color (see above)</entry>
 717  *       </row>
 718  *       <row>
 719  *         <entry>border-right-color</entry>
 720  *       </row>
 721  *       <row>
 722  *         <entry>border-bottom-color</entry>
 723  *       </row>
 724  *       <row>
 725  *         <entry>border-left-color</entry>
 726  *       </row>
 727  *       <row>
 728  *         <entry>border-color</entry>
 729  *         <entry>[transparent|color]{1,4}</entry>
 730  *       </row>
 731  *       <row>
 732  *         <entry>font-family</entry>
 733  *         <entry>@family [, @family]*</entry>
 734  *         <entry>#gchararray</entry>
 735  *         <entry>font-family: Sans, Arial;</entry>
 736  *       </row>
 737  *       <row>
 738  *         <entry>font-style</entry>
 739  *         <entry>[normal|oblique|italic]</entry>
 740  *         <entry>#PANGO_TYPE_STYLE</entry>
 741  *         <entry>font-style: italic;</entry>
 742  *       </row>
 743  *       <row>
 744  *         <entry>font-variant</entry>
 745  *         <entry>[normal|small-caps]</entry>
 746  *         <entry>#PANGO_TYPE_VARIANT</entry>
 747  *         <entry>font-variant: normal;</entry>
 748  *       </row>
 749  *       <row>
 750  *         <entry>font-weight</entry>
 751  *         <entry>[normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900]</entry>
 752  *         <entry>#PANGO_TYPE_WEIGHT</entry>
 753  *         <entry>font-weight: bold;</entry>
 754  *       </row>
 755  *       <row>
 756  *         <entry>font-size</entry>
 757  *         <entry>Font size in point</entry>
 758  *         <entry>#gint</entry>
 759  *         <entry>font-size: 13;</entry>
 760  *       </row>
 761  *       <row>
 762  *         <entry>font</entry>
 763  *         <entry>@family [@style] [@size]</entry>
 764  *         <entry>#PangoFontDescription</entry>
 765  *         <entry>font: Sans 15;</entry>
 766  *       </row>
 767  *       <row>
 768  *         <entry>margin-top</entry>
 769  *         <entry>integer</entry>
 770  *         <entry>#gint</entry>
 771  *         <entry>margin-top: 0;</entry>
 772  *       </row>
 773  *       <row>
 774  *         <entry>margin-left</entry>
 775  *         <entry>integer</entry>
 776  *         <entry>#gint</entry>
 777  *         <entry>margin-left: 1;</entry>
 778  *       </row>
 779  *       <row>
 780  *         <entry>margin-bottom</entry>
 781  *         <entry>integer</entry>
 782  *         <entry>#gint</entry>
 783  *         <entry>margin-bottom: 2;</entry>
 784  *       </row>
 785  *       <row>
 786  *         <entry>margin-right</entry>
 787  *         <entry>integer</entry>
 788  *         <entry>#gint</entry>
 789  *         <entry>margin-right: 4;</entry>
 790  *       </row>
 791  *       <row>
 792  *         <entry>margin</entry>
 793  *         <entry morerows="1"><literallayout>@width
 794  * @vertical_width @horizontal_width
 795  * @top_width @horizontal_width @bottom_width
 796  * @top_width @right_width @bottom_width @left_width</literallayout>
 797  *         </entry>
 798  *         <entry morerows="1">#GtkBorder</entry>
 799  *         <entry morerows="1"><literallayout>margin: 5;
 800  * margin: 5 10;
 801  * margin: 5 10 3;
 802  * margin: 5 10 3 5;</literallayout>
 803  *         </entry>
 804  *       </row>
 805  *       <row>
 806  *         <entry>padding-top</entry>
 807  *         <entry>integer</entry>
 808  *         <entry>#gint</entry>
 809  *         <entry>padding-top: 5;</entry>
 810  *       </row>
 811  *       <row>
 812  *         <entry>padding-left</entry>
 813  *         <entry>integer</entry>
 814  *         <entry>#gint</entry>
 815  *         <entry>padding-left: 5;</entry>
 816  *       </row>
 817  *       <row>
 818  *         <entry>padding-bottom</entry>
 819  *         <entry>integer</entry>
 820  *         <entry>#gint</entry>
 821  *         <entry>padding-bottom: 5;</entry>
 822  *       </row>
 823  *       <row>
 824  *         <entry>padding-right</entry>
 825  *         <entry>integer</entry>
 826  *         <entry>#gint</entry>
 827  *         <entry>padding-right: 5;</entry>
 828  *       </row>
 829  *       <row>
 830  *         <entry>padding</entry>
 831  *       </row>
 832  *       <row>
 833  *         <entry>background-image</entry>
 834  *         <entry><literallayout>gradient (see above) or
 835  * url(@path)</literallayout></entry>
 836  *         <entry>#cairo_pattern_t</entry>
 837  *         <entry><literallayout>-gtk-gradient (linear,
 838  *                left top, right top,
 839  *                from (&num;fff), to (&num;000));
 840  * -gtk-gradient (linear, 0.0 0.5, 0.5 1.0,
 841  *                from (&num;fff),
 842  *                color-stop (0.5, &num;f00),
 843  *                to (&num;000));
 844  * -gtk-gradient (radial,
 845  *                center center, 0.2,
 846  *                center center, 0.8,
 847  *                color-stop (0.0, &num;fff),
 848  *                color-stop (1.0, &num;000));
 849  * url ('background.png');</literallayout>
 850  *         </entry>
 851  *       </row>
 852  *       <row>
 853  *         <entry>background-repeat</entry>
 854  *         <entry>[repeat|no-repeat]</entry>
 855  *         <entry>internal</entry>
 856  *         <entry><literallayout>background-repeat: no-repeat;</literallayout>
 857  *                If not specified, the style doesn't respect the CSS3
 858  *                specification, since the background will be
 859  *                stretched to fill the area.
 860  *         </entry>
 861  *       </row>
 862  *       <row>
 863  *         <entry>border-top-width</entry>
 864  *         <entry>integer</entry>
 865  *         <entry>#gint</entry>
 866  *         <entry>border-top-width: 5;</entry>
 867  *       </row>
 868  *       <row>
 869  *         <entry>border-left-width</entry>
 870  *         <entry>integer</entry>
 871  *         <entry>#gint</entry>
 872  *         <entry>border-left-width: 5;</entry>
 873  *       </row>
 874  *       <row>
 875  *         <entry>border-bottom-width</entry>
 876  *         <entry>integer</entry>
 877  *         <entry>#gint</entry>
 878  *         <entry>border-bottom-width: 5;</entry>
 879  *       </row>
 880  *       <row>
 881  *         <entry>border-right-width</entry>
 882  *         <entry>integer</entry>
 883  *         <entry>#gint</entry>
 884  *         <entry>border-right-width: 5;</entry>
 885  *       </row>
 886  *       <row>
 887  *         <entry>border-width</entry>
 888  *         <entry morerows="1">#GtkBorder</entry>
 889  *         <entry morerows="1"><literallayout>border-width: 1;
 890  * border-width: 1 2;
 891  * border-width: 1 2 3;
 892  * border-width: 1 2 3 5;</literallayout>
 893  *         </entry>
 894  *       </row>
 895  *       <row>
 896  *         <entry>border-radius</entry>
 897  *         <entry>integer</entry>
 898  *         <entry>#gint</entry>
 899  *         <entry>border-radius: 5;</entry>
 900  *       </row>
 901  *       <row>
 902  *         <entry>border-style</entry>
 903  *         <entry>[none|solid|inset|outset]</entry>
 904  *         <entry>#GtkBorderStyle</entry>
 905  *         <entry>border-style: solid;</entry>
 906  *       </row>
 907  *       <row>
 908  *         <entry>border-image</entry>
 909  *         <entry><literallayout>border image (see above)</literallayout></entry>
 910  *         <entry>internal use only</entry>
 911  *         <entry><literallayout>border-image: url("/path/to/image.png") 3 4 3 4 stretch;
 912  * border-image: url("/path/to/image.png") 3 4 4 3 repeat stretch;</literallayout>
 913  *         </entry>
 914  *       </row>
 915  *       <row>
 916  *         <entry>text-shadow</entry>
 917  *         <entry>shadow list (see above)</entry>
 918  *         <entry>#GtkTextShadow</entry>
 919  *         <entry><literallayout>text-shadow: 1 1 0 blue, -4 -4 red;</literallayout></entry>
 920  *       </row>
 921  *       <row>
 922  *         <entry>transition</entry>
 923  *         <entry>transition (see above)</entry>
 924  *         <entry>internal use only</entry>
 925  *         <entry><literallayout>transition: 150ms ease-in-out;
 926  * transition: 1s linear loop;</literallayout>
 927  *         </entry>
 928  *       </row>
 929  *       <row>
 930  *         <entry>gtk-key-bindings</entry>
 931  *         <entry>binding set name list</entry>
 932  *         <entry>internal use only</entry>
 933  *         <entry><literallayout>gtk-bindings: binding1, binding2, ...;</literallayout>
 934  *         </entry>
 935  *       </row>
 936  *     </tbody>
 937  *   </tgroup>
 938  * </informaltable>
 939  * <para>
 940  * GtkThemingEngines can register their own, engine-specific style properties
 941  * with the function gtk_theming_engine_register_property(). These properties
 942  * can be set in CSS like other properties, using a name of the form
 943  * <literallayout>-<replaceable>namespace</replaceable>-<replaceable>name</replaceable></literallayout>, where <replaceable>namespace</replaceable> is typically
 944  * the name of the theming engine, and <replaceable>name</replaceable> is the
 945  * name of the property. Style properties that have been registered by widgets
 946  * using gtk_widget_class_install_style_property() can also be set in this
 947  * way, using the widget class name for <replaceable>namespace</replaceable>.
 948  * </para>
 949  * <example>
 950  * <title>Using engine-specific style properties</title>
 951  * <programlisting>
 952  * * {
 953  *     engine: clearlooks;
 954  *     border-radius: 4;
 955  *     -GtkPaned-handle-size: 6;
 956  *     -clearlooks-colorize-scrollbar: false;
 957  * }
 958  * </programlisting>
 959  * </example>
 960  * </refsect2>
 961  */
 962
 963 typedef struct GtkCssRuleset GtkCssRuleset;
 964 typedef struct _GtkCssScanner GtkCssScanner;
 965 typedef struct _PropertyValue PropertyValue;
 966 typedef struct _WidgetPropertyValue WidgetPropertyValue;
 967 typedef enum ParserScope ParserScope;
 968 typedef enum ParserSymbol ParserSymbol;
 969
 970 struct _PropertyValue {
 971   GtkCssStyleProperty *property;
 972   GtkCssValue         *value;
 973   GtkCssSection       *section;
 974 };
 975
 976 struct _WidgetPropertyValue {
 977   char *name;
 978   WidgetPropertyValue *next;
 979   GtkCssValue         *value;
 980
 981   GtkCssSection *section;
 982 };
 983
 984 struct GtkCssRuleset
 985 {
 986   GtkCssSelector *selector;
 987   WidgetPropertyValue *widget_style;
 988   PropertyValue *styles;
 989   GtkBitmask *set_styles;
 990   guint n_styles;
 991   guint owns_styles : 1;
 992   guint owns_widget_style : 1;
 993 };
 994
 995 struct _GtkCssScanner
 996 {
 997   GtkCssProvider *provider;
 998   GtkCssParser *parser;
 999   GtkCssSection *section;
1000   GtkCssScanner *parent;
1001   GFile *file;
1002   GFile *base;
1003   GSList *state;
1004 };
1005
1006 struct _GtkCssProviderPrivate
1007 {
1008   GScanner *scanner;
1009
1010   GHashTable *symbolic_colors;
1011
1012   GArray *rulesets;
1013   GResource *resource;
1014 };
1015
1016 enum {
1017   PARSING_ERROR,
1018   LAST_SIGNAL
1019 };
1020
1021 static guint css_provider_signals[LAST_SIGNAL] = { 0 };
1022
1023 static void gtk_css_provider_finalize (GObject *object);
1024 static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
1025 static void gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface);
1026 static void widget_property_value_list_free (WidgetPropertyValue *head);
1027
1028 static gboolean
1029 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
1030                                 GtkCssScanner  *scanner,
1031                                 GFile          *file,
1032                                 const char     *data,
1033                                 GError        **error);
1034
1035 GQuark
1036 gtk_css_provider_error_quark (void)
1037 {
1038   return g_quark_from_static_string ("gtk-css-provider-error-quark");
1039 }
1040
1041 G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
1042                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
1043                                                gtk_css_style_provider_iface_init)
1044                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER_PRIVATE,
1045                                                gtk_css_style_provider_private_iface_init));
1046
1047 static void
1048 gtk_css_provider_parsing_error (GtkCssProvider  *provider,
1049                                 GtkCssSection   *section,
1050                                 const GError    *error)
1051 {
1052   /* Only emit a warning when we have no error handlers. This is our
1053    * default handlers. And in this case erroneous CSS files are a bug
1054    * and should be fixed.
1055    * Note that these warnings can also be triggered by a broken theme
1056    * that people installed from some weird location on the internets.
1057    */
1058   if (!g_signal_has_handler_pending (provider,
1059                                      css_provider_signals[PARSING_ERROR],
1060                                      0,
1061                                      TRUE))
1062     {
1063       GFileInfo *info;
1064       GFile *file;
1065       const char *path;
1066
1067       file = gtk_css_section_get_file (section);
1068       if (file)
1069         {
1070           info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1071
1072           if (info)
1073             path = g_file_info_get_display_name (info);
1074           else
1075             path = "<broken file>";
1076         }
1077       else
1078         {
1079           info = NULL;
1080           path = "<data>";
1081         }
1082
1083       g_warning ("Theme parsing error: %s:%u:%u: %s",
1084                  path,
1085                  gtk_css_section_get_end_line (section) + 1,
1086                  gtk_css_section_get_end_position (section),
1087                  error->message);
1088
1089       if (info)
1090         g_object_unref (info);
1091     }
1092 }
1093
1094 static void
1095 gtk_css_provider_class_init (GtkCssProviderClass *klass)
1096 {
1097   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1098
1099   /**
1100    * GtkCssProvider::parsing-error:
1101    * @provider: the provider that had a parsing error
1102    * @section: section the error happened in
1103    * @error: The parsing error
1104    *
1105    * Signals that a parsing error occured. the @path, @line and @position
1106    * describe the actual location of the error as accurately as possible.
1107    *
1108    * Parsing errors are never fatal, so the parsing will resume after
1109    * the error. Errors may however cause parts of the given
1110    * data or even all of it to not be parsed at all. So it is a useful idea
1111    * to check that the parsing succeeds by connecting to this signal.
1112    *
1113    * Note that this signal may be emitted at any time as the css provider
1114    * may opt to defer parsing parts or all of the input to a later time
1115    * than when a loading function was called.
1116    */
1117   css_provider_signals[PARSING_ERROR] =
1118     g_signal_new (I_("parsing-error"),
1119                   G_TYPE_FROM_CLASS (object_class),
1120                   G_SIGNAL_RUN_LAST,
1121                   G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
1122                   NULL, NULL,
1123                   _gtk_marshal_VOID__BOXED_BOXED,
1124                   G_TYPE_NONE, 2, GTK_TYPE_CSS_SECTION, G_TYPE_ERROR);
1125
1126   object_class->finalize = gtk_css_provider_finalize;
1127
1128   klass->parsing_error = gtk_css_provider_parsing_error;
1129
1130   g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
1131 }
1132
1133 static void
1134 gtk_css_ruleset_init_copy (GtkCssRuleset       *new,
1135                            GtkCssRuleset       *ruleset,
1136                            GtkCssSelector      *selector)
1137 {
1138   memcpy (new, ruleset, sizeof (GtkCssRuleset));
1139
1140   new->selector = selector;
1141   /* First copy takes over ownership */
1142   if (ruleset->owns_styles)
1143     ruleset->owns_styles = FALSE;
1144   if (ruleset->owns_widget_style)
1145     ruleset->owns_widget_style = FALSE;
1146   if (new->set_styles)
1147     new->set_styles = _gtk_bitmask_copy (new->set_styles);
1148 }
1149
1150 static void
1151 gtk_css_ruleset_clear (GtkCssRuleset *ruleset)
1152 {
1153   if (ruleset->owns_styles)
1154     {
1155       guint i;
1156
1157       for (i = 0; i < ruleset->n_styles; i++)
1158         {
1159           _gtk_css_value_unref (ruleset->styles[i].value);
1160           ruleset->styles[i].value = NULL;
1161           gtk_css_section_unref (ruleset->styles[i].section);
1162         }
1163       g_free (ruleset->styles);
1164     }
1165   if (ruleset->set_styles)
1166     _gtk_bitmask_free (ruleset->set_styles);
1167   if (ruleset->owns_widget_style)
1168     widget_property_value_list_free (ruleset->widget_style);
1169   if (ruleset->selector)
1170     _gtk_css_selector_free (ruleset->selector);
1171
1172   memset (ruleset, 0, sizeof (GtkCssRuleset));
1173 }
1174
1175 static WidgetPropertyValue *
1176 widget_property_value_new (char *name, GtkCssSection *section)
1177 {
1178   WidgetPropertyValue *value;
1179
1180   value = g_slice_new0 (WidgetPropertyValue);
1181
1182   value->name = name;
1183   value->section = gtk_css_section_ref (section);
1184
1185   return value;
1186 }
1187
1188 static void
1189 widget_property_value_free (WidgetPropertyValue *value)
1190 {
1191   _gtk_css_value_unref (value->value);
1192   g_free (value->name);
1193   gtk_css_section_unref (value->section);
1194
1195   g_slice_free (WidgetPropertyValue, value);
1196 }
1197
1198 static void
1199 widget_property_value_list_free (WidgetPropertyValue *head)
1200 {
1201   WidgetPropertyValue *l, *next;
1202   for (l = head; l != NULL; l = next)
1203     {
1204       next = l->next;
1205       widget_property_value_free (l);
1206     }
1207 }
1208
1209 static WidgetPropertyValue *
1210 widget_property_value_list_remove_name (WidgetPropertyValue *head, const char *name)
1211 {
1212   WidgetPropertyValue *l, **last;
1213
1214   last = &head;
1215
1216   for (l = head; l != NULL; l = l->next)
1217     {
1218       if (strcmp (l->name, name) == 0)
1219         {
1220           *last = l->next;
1221           widget_property_value_free (l);
1222           break;
1223         }
1224
1225       last = &l->next;
1226     }
1227
1228   return head;
1229 }
1230
1231 static void
1232 gtk_css_ruleset_add_style (GtkCssRuleset *ruleset,
1233                            char          *name,
1234                            WidgetPropertyValue *value)
1235 {
1236   value->next = widget_property_value_list_remove_name (ruleset->widget_style, name);
1237   ruleset->widget_style = value;
1238   ruleset->owns_widget_style = TRUE;
1239 }
1240
1241 static void
1242 gtk_css_ruleset_add (GtkCssRuleset       *ruleset,
1243                      GtkCssStyleProperty *property,
1244                      const GValue        *value,
1245                      GtkCssSection       *section)
1246 {
1247   guint i;
1248
1249   g_return_if_fail (_gtk_css_style_property_is_specified_type (property, G_VALUE_TYPE (value)));
1250   g_return_if_fail (ruleset->owns_styles || ruleset->n_styles == 0);
1251
1252   if (ruleset->set_styles == NULL)
1253     ruleset->set_styles = _gtk_bitmask_new ();
1254
1255   ruleset->set_styles = _gtk_bitmask_set (ruleset->set_styles,
1256                                           _gtk_css_style_property_get_id (property),
1257                                           TRUE);
1258
1259   ruleset->owns_styles = TRUE;
1260
1261   for (i = 0; i < ruleset->n_styles; i++)
1262     {
1263       if (ruleset->styles[i].property == property)
1264         {
1265           _gtk_css_value_unref (ruleset->styles[i].value);
1266           ruleset->styles[i].value = NULL;
1267           gtk_css_section_unref (ruleset->styles[i].section);
1268           break;
1269         }
1270     }
1271   if (i == ruleset->n_styles)
1272     {
1273       ruleset->n_styles++;
1274       ruleset->styles = g_realloc (ruleset->styles, ruleset->n_styles * sizeof (PropertyValue));
1275       ruleset->styles[i].value = NULL;
1276       ruleset->styles[i].property = property;
1277     }
1278
1279   ruleset->styles[i].value = _gtk_css_value_new_from_gvalue (value);
1280   ruleset->styles[i].section = gtk_css_section_ref (section);
1281 }
1282
1283 static gboolean
1284 gtk_css_ruleset_matches (GtkCssRuleset *ruleset,
1285                          GtkWidgetPath *path,
1286                          GtkStateFlags  state)
1287 {
1288   return _gtk_css_selector_matches (ruleset->selector, path, state);
1289 }
1290
1291 static void
1292 gtk_css_scanner_destroy (GtkCssScanner *scanner)
1293 {
1294   if (scanner->section)
1295     gtk_css_section_unref (scanner->section);
1296   g_object_unref (scanner->provider);
1297   if (scanner->file)
1298     g_object_unref (scanner->file);
1299   g_object_unref (scanner->base);
1300   _gtk_css_parser_free (scanner->parser);
1301
1302   g_slice_free (GtkCssScanner, scanner);
1303 }
1304
1305 static void
1306 gtk_css_provider_emit_error (GtkCssProvider *provider,
1307                              GtkCssScanner  *scanner,
1308                              const GError   *error)
1309 {
1310   g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
1311                  scanner != NULL ? scanner->section : NULL, error);
1312 }
1313
1314 static void
1315 gtk_css_scanner_parser_error (GtkCssParser *parser,
1316                               const GError *error,
1317                               gpointer      user_data)
1318 {
1319   GtkCssScanner *scanner = user_data;
1320
1321   gtk_css_provider_emit_error (scanner->provider,
1322                                scanner,
1323                                error);
1324 }
1325
1326 static GtkCssScanner *
1327 gtk_css_scanner_new (GtkCssProvider *provider,
1328                      GtkCssScanner  *parent,
1329                      GtkCssSection  *section,
1330                      GFile          *file,
1331                      const gchar    *text)
1332 {
1333   GtkCssScanner *scanner;
1334
1335   scanner = g_slice_new0 (GtkCssScanner);
1336
1337   g_object_ref (provider);
1338   scanner->provider = provider;
1339   scanner->parent = parent;
1340   if (section)
1341     scanner->section = gtk_css_section_ref (section);
1342
1343   if (file)
1344     {
1345       scanner->file = g_object_ref (file);
1346       scanner->base = g_file_get_parent (file);
1347     }
1348   else
1349     {
1350       char *dir = g_get_current_dir ();
1351       scanner->base = g_file_new_for_path (dir);
1352       g_free (dir);
1353     }
1354
1355   scanner->parser = _gtk_css_parser_new (text,
1356                                          gtk_css_scanner_parser_error,
1357                                          scanner);
1358
1359   return scanner;
1360 }
1361
1362 static GFile *
1363 gtk_css_scanner_get_base_url (GtkCssScanner *scanner)
1364 {
1365   return scanner->base;
1366 }
1367
1368 static gboolean
1369 gtk_css_scanner_would_recurse (GtkCssScanner *scanner,
1370                                GFile         *file)
1371 {
1372   while (scanner)
1373     {
1374       if (scanner->file && g_file_equal (scanner->file, file))
1375         return TRUE;
1376
1377       scanner = scanner->parent;
1378     }
1379
1380   return FALSE;
1381 }
1382
1383 static void
1384 gtk_css_scanner_push_section (GtkCssScanner     *scanner,
1385                               GtkCssSectionType  section_type)
1386 {
1387   GtkCssSection *section;
1388
1389   section = _gtk_css_section_new (scanner->section,
1390                                   section_type,
1391                                   scanner->parser,
1392                                   scanner->file);
1393
1394   if (scanner->section)
1395     gtk_css_section_unref (scanner->section);
1396   scanner->section = section;
1397 }
1398
1399 static void
1400 gtk_css_scanner_pop_section (GtkCssScanner *scanner,
1401                              GtkCssSectionType check_type)
1402 {
1403   GtkCssSection *parent;
1404
1405   g_assert (gtk_css_section_get_section_type (scanner->section) == check_type);
1406
1407   parent = gtk_css_section_get_parent (scanner->section);
1408   if (parent)
1409     gtk_css_section_ref (parent);
1410
1411   _gtk_css_section_end (scanner->section);
1412   gtk_css_section_unref (scanner->section);
1413
1414   scanner->section = parent;
1415 }
1416
1417 static void
1418 gtk_css_provider_init (GtkCssProvider *css_provider)
1419 {
1420   GtkCssProviderPrivate *priv;
1421
1422   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1423                                                            GTK_TYPE_CSS_PROVIDER,
1424                                                            GtkCssProviderPrivate);
1425
1426   priv->rulesets = g_array_new (FALSE, FALSE, sizeof (GtkCssRuleset));
1427
1428   priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
1429                                                  (GDestroyNotify) g_free,
1430                                                  (GDestroyNotify) gtk_symbolic_color_unref);
1431 }
1432
1433 static void
1434 css_provider_dump_symbolic_colors (GtkCssProvider     *css_provider,
1435                                    GtkStyleProperties *props)
1436 {
1437   GtkCssProviderPrivate *priv;
1438   GHashTableIter iter;
1439   gpointer key, value;
1440
1441   priv = css_provider->priv;
1442   g_hash_table_iter_init (&iter, priv->symbolic_colors);
1443
1444   while (g_hash_table_iter_next (&iter, &key, &value))
1445     {
1446       const gchar *name;
1447       GtkSymbolicColor *color;
1448
1449       name = key;
1450       color = value;
1451
1452       gtk_style_properties_map_color (props, name, color);
1453     }
1454 }
1455
1456 static GtkStyleProperties *
1457 gtk_css_provider_get_style (GtkStyleProvider *provider,
1458                             GtkWidgetPath    *path)
1459 {
1460   GtkCssProvider *css_provider;
1461   GtkCssProviderPrivate *priv;
1462   GtkStyleProperties *props;
1463   guint i, j;
1464
1465   css_provider = GTK_CSS_PROVIDER (provider);
1466   priv = css_provider->priv;
1467   props = gtk_style_properties_new ();
1468
1469   css_provider_dump_symbolic_colors (css_provider, props);
1470
1471   for (i = 0; i < priv->rulesets->len; i++)
1472     {
1473       GtkCssRuleset *ruleset;
1474
1475       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1476
1477       if (ruleset->styles == NULL)
1478         continue;
1479
1480       if (!gtk_css_ruleset_matches (ruleset, path, 0))
1481         continue;
1482
1483       for (j = 0; j < ruleset->n_styles; j++)
1484         _gtk_style_properties_set_property_by_property (props,
1485                                                         GTK_CSS_STYLE_PROPERTY (ruleset->styles[i].property),
1486                                                         _gtk_css_selector_get_state_flags (ruleset->selector),
1487                                                         ruleset->styles[i].value);
1488     }
1489
1490   return props;
1491 }
1492
1493 static gboolean
1494 gtk_css_provider_get_style_property (GtkStyleProvider *provider,
1495                                      GtkWidgetPath    *path,
1496                                      GtkStateFlags     state,
1497                                      GParamSpec       *pspec,
1498                                      GValue           *value)
1499 {
1500   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1501   GtkCssProviderPrivate *priv = css_provider->priv;
1502   WidgetPropertyValue *val;
1503   gboolean found = FALSE;
1504   gchar *prop_name;
1505   gint i;
1506
1507   prop_name = g_strdup_printf ("-%s-%s",
1508                                g_type_name (pspec->owner_type),
1509                                pspec->name);
1510
1511   for (i = priv->rulesets->len - 1; i >= 0; i--)
1512     {
1513       GtkCssRuleset *ruleset;
1514
1515       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1516
1517       if (ruleset->widget_style == NULL)
1518         continue;
1519
1520       if (!gtk_css_ruleset_matches (ruleset, path, state))
1521         continue;
1522
1523       for (val = ruleset->widget_style; val != NULL; val = val->next)
1524         {
1525           if (strcmp (val->name, prop_name) == 0)
1526             {
1527               GtkCssScanner *scanner;
1528
1529               scanner = gtk_css_scanner_new (css_provider,
1530                                              NULL,
1531                                              val->section,
1532                                              gtk_css_section_get_file (val->section),
1533                                              _gtk_css_value_get_string (val->value));
1534
1535               found = _gtk_css_style_parse_value (value,
1536                                                   scanner->parser,
1537                                                   NULL);
1538
1539               gtk_css_scanner_destroy (scanner);
1540
1541               break;
1542             }
1543         }
1544
1545       if (found)
1546         break;
1547     }
1548
1549   g_free (prop_name);
1550
1551   return found;
1552 }
1553
1554 static void
1555 gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
1556 {
1557   iface->get_style = gtk_css_provider_get_style;
1558   iface->get_style_property = gtk_css_provider_get_style_property;
1559 }
1560
1561 static GtkSymbolicColor *
1562 gtk_css_style_provider_get_color (GtkStyleProviderPrivate *provider,
1563                                   const char              *name)
1564 {
1565   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1566
1567   return g_hash_table_lookup (css_provider->priv->symbolic_colors, name);
1568 }
1569
1570 static void
1571 gtk_css_style_provider_lookup (GtkStyleProviderPrivate *provider,
1572                                GtkWidgetPath           *path,
1573                                GtkStateFlags            state,
1574                                GtkCssLookup            *lookup)
1575 {
1576   GtkCssProvider *css_provider;
1577   GtkCssProviderPrivate *priv;
1578   int i;
1579   guint j;
1580
1581   css_provider = GTK_CSS_PROVIDER (provider);
1582   priv = css_provider->priv;
1583
1584   for (i = priv->rulesets->len - 1; i >= 0; i--)
1585     {
1586       GtkCssRuleset *ruleset;
1587
1588       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1589
1590       if (ruleset->styles == NULL)
1591         continue;
1592
1593       if (!_gtk_bitmask_intersects (_gtk_css_lookup_get_missing (lookup),
1594                                     ruleset->set_styles))
1595         continue;
1596
1597       if (!gtk_css_ruleset_matches (ruleset, path, state))
1598         continue;
1599
1600       for (j = 0; j < ruleset->n_styles; j++)
1601         {
1602           GtkCssStyleProperty *prop = ruleset->styles[j].property;
1603           guint id = _gtk_css_style_property_get_id (prop);
1604
1605           if (!_gtk_css_lookup_is_missing (lookup, id))
1606             continue;
1607
1608           _gtk_css_lookup_set (lookup,
1609                                id,
1610                                ruleset->styles[j].section,
1611                                ruleset->styles[j].value);
1612         }
1613     }
1614 }
1615
1616 static void
1617 gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface)
1618 {
1619   iface->get_color = gtk_css_style_provider_get_color;
1620   iface->lookup = gtk_css_style_provider_lookup;
1621 }
1622
1623 static void
1624 gtk_css_provider_finalize (GObject *object)
1625 {
1626   GtkCssProvider *css_provider;
1627   GtkCssProviderPrivate *priv;
1628   guint i;
1629
1630   css_provider = GTK_CSS_PROVIDER (object);
1631   priv = css_provider->priv;
1632
1633   for (i = 0; i < priv->rulesets->len; i++)
1634     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1635
1636   g_array_free (priv->rulesets, TRUE);
1637
1638   if (priv->symbolic_colors)
1639     g_hash_table_destroy (priv->symbolic_colors);
1640
1641   if (priv->resource)
1642     {
1643       g_resources_unregister (priv->resource);
1644       g_resource_unref (priv->resource);
1645       priv->resource = NULL;
1646     }
1647
1648   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1649 }
1650
1651 /**
1652  * gtk_css_provider_new:
1653  *
1654  * Returns a newly created #GtkCssProvider.
1655  *
1656  * Returns: A new #GtkCssProvider
1657  **/
1658 GtkCssProvider *
1659 gtk_css_provider_new (void)
1660 {
1661   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1662 }
1663
1664 static void
1665 gtk_css_provider_take_error (GtkCssProvider *provider,
1666                              GtkCssScanner  *scanner,
1667                              GError         *error)
1668 {
1669   gtk_css_provider_emit_error (provider,
1670                                scanner,
1671                                error);
1672
1673   g_error_free (error);
1674 }
1675
1676 static void
1677 gtk_css_provider_error_literal (GtkCssProvider *provider,
1678                                 GtkCssScanner  *scanner,
1679                                 GQuark          domain,
1680                                 gint            code,
1681                                 const char     *message)
1682 {
1683   gtk_css_provider_take_error (provider,
1684                                scanner,
1685                                g_error_new_literal (domain, code, message));
1686 }
1687
1688 static void
1689 gtk_css_provider_error (GtkCssProvider *provider,
1690                         GtkCssScanner  *scanner,
1691                         GQuark          domain,
1692                         gint            code,
1693                         const char     *format,
1694                         ...)  G_GNUC_PRINTF (5, 6);
1695 static void
1696 gtk_css_provider_error (GtkCssProvider *provider,
1697                         GtkCssScanner  *scanner,
1698                         GQuark          domain,
1699                         gint            code,
1700                         const char     *format,
1701                         ...)
1702 {
1703   GError *error;
1704   va_list args;
1705
1706   va_start (args, format);
1707   error = g_error_new_valist (domain, code, format, args);
1708   va_end (args);
1709
1710   gtk_css_provider_take_error (provider, scanner, error);
1711 }
1712
1713 static void
1714 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1715                                 GtkCssScanner  *scanner,
1716                                 const char     *expected)
1717 {
1718   gtk_css_provider_error (provider,
1719                           scanner,
1720                           GTK_CSS_PROVIDER_ERROR,
1721                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1722                           "expected a valid %s", expected);
1723 }
1724
1725 static void
1726 css_provider_commit (GtkCssProvider *css_provider,
1727                      GSList         *selectors,
1728                      GtkCssRuleset  *ruleset)
1729 {
1730   GtkCssProviderPrivate *priv;
1731   GSList *l;
1732
1733   priv = css_provider->priv;
1734
1735   if (ruleset->styles == NULL && ruleset->widget_style == NULL)
1736     {
1737       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
1738       return;
1739     }
1740
1741   for (l = selectors; l; l = l->next)
1742     {
1743       GtkCssRuleset new;
1744
1745       gtk_css_ruleset_init_copy (&new, ruleset, l->data);
1746
1747       g_array_append_val (priv->rulesets, new);
1748     }
1749
1750   g_slist_free (selectors);
1751 }
1752
1753 static void
1754 gtk_css_provider_reset (GtkCssProvider *css_provider)
1755 {
1756   GtkCssProviderPrivate *priv;
1757   guint i;
1758
1759   priv = css_provider->priv;
1760
1761   if (priv->resource)
1762     {
1763       g_resources_unregister (priv->resource);
1764       g_resource_unref (priv->resource);
1765       priv->resource = NULL;
1766     }
1767
1768   g_hash_table_remove_all (priv->symbolic_colors);
1769
1770   for (i = 0; i < priv->rulesets->len; i++)
1771     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1772   g_array_set_size (priv->rulesets, 0);
1773 }
1774
1775 static void
1776 gtk_css_provider_propagate_error (GtkCssProvider  *provider,
1777                                   GtkCssSection   *section,
1778                                   const GError    *error,
1779                                   GError         **propagate_to)
1780 {
1781
1782   GFileInfo *info;
1783   GFile *file;
1784   const char *path;
1785
1786   file = gtk_css_section_get_file (section);
1787   if (file)
1788     {
1789       info = g_file_query_info (file,G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1790
1791       if (info)
1792         path = g_file_info_get_display_name (info);
1793       else
1794         path = "<broken file>";
1795     }
1796   else
1797     {
1798       info = NULL;
1799       path = "<unknown>";
1800     }
1801
1802   /* don't fail for deprecations */
1803   if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
1804     {
1805       g_warning ("Theme parsing error: %s:%u:%u: %s", path,
1806                  gtk_css_section_get_end_line (section) + 1,
1807                  gtk_css_section_get_end_position (section), error->message);
1808       return;
1809     }
1810
1811   /* we already set an error. And we'd like to keep the first one */
1812   if (*propagate_to)
1813     return;
1814
1815   *propagate_to = g_error_copy (error);
1816   g_prefix_error (propagate_to, "%s:%u:%u: ", path,
1817                   gtk_css_section_get_end_line (section) + 1,
1818                   gtk_css_section_get_end_position (section));
1819
1820   if (info)
1821     g_object_unref (info);
1822 }
1823
1824 static gboolean
1825 parse_import (GtkCssScanner *scanner)
1826 {
1827   GFile *file;
1828
1829   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_IMPORT);
1830
1831   if (!_gtk_css_parser_try (scanner->parser, "@import", TRUE))
1832     {
1833       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1834       return FALSE;
1835     }
1836
1837   if (_gtk_css_parser_is_string (scanner->parser))
1838     {
1839       char *uri;
1840
1841       uri = _gtk_css_parser_read_string (scanner->parser);
1842       file = g_file_resolve_relative_path (gtk_css_scanner_get_base_url (scanner), uri);
1843       g_free (uri);
1844     }
1845   else
1846     {
1847       file = _gtk_css_parser_read_url (scanner->parser,
1848                                        gtk_css_scanner_get_base_url (scanner));
1849     }
1850
1851   if (file == NULL)
1852     {
1853       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1854       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1855       return TRUE;
1856     }
1857
1858   if (!_gtk_css_parser_try (scanner->parser, ";", FALSE))
1859     {
1860       gtk_css_provider_invalid_token (scanner->provider, scanner, "semicolon");
1861       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1862     }
1863   else if (gtk_css_scanner_would_recurse (scanner, file))
1864     {
1865        char *path = g_file_get_path (file);
1866        gtk_css_provider_error (scanner->provider,
1867                                scanner,
1868                                GTK_CSS_PROVIDER_ERROR,
1869                                GTK_CSS_PROVIDER_ERROR_IMPORT,
1870                                "Loading '%s' would recurse",
1871                                path);
1872        g_free (path);
1873     }
1874   else
1875     {
1876       gtk_css_provider_load_internal (scanner->provider,
1877                                       scanner,
1878                                       file,
1879                                       NULL,
1880                                       NULL);
1881     }
1882
1883   g_object_unref (file);
1884
1885   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1886   _gtk_css_parser_skip_whitespace (scanner->parser);
1887
1888   return TRUE;
1889 }
1890
1891 static gboolean
1892 parse_color_definition (GtkCssScanner *scanner)
1893 {
1894   GtkSymbolicColor *symbolic;
1895   char *name;
1896
1897   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1898
1899   if (!_gtk_css_parser_try (scanner->parser, "@define-color", TRUE))
1900     {
1901       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1902       return FALSE;
1903     }
1904
1905   name = _gtk_css_parser_try_name (scanner->parser, TRUE);
1906   if (name == NULL)
1907     {
1908       gtk_css_provider_error_literal (scanner->provider,
1909                                       scanner,
1910                                       GTK_CSS_PROVIDER_ERROR,
1911                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1912                                       "Not a valid color name");
1913       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1914       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1915       return TRUE;
1916     }
1917
1918   symbolic = _gtk_css_parser_read_symbolic_color (scanner->parser);
1919   if (symbolic == NULL)
1920     {
1921       g_free (name);
1922       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1923       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1924       return TRUE;
1925     }
1926
1927   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1928     {
1929       g_free (name);
1930       gtk_symbolic_color_unref (symbolic);
1931       gtk_css_provider_error_literal (scanner->provider,
1932                                       scanner,
1933                                       GTK_CSS_PROVIDER_ERROR,
1934                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1935                                       "Missing semicolon at end of color definition");
1936       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1937
1938       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1939       return TRUE;
1940     }
1941
1942   g_hash_table_insert (scanner->provider->priv->symbolic_colors, name, symbolic);
1943
1944   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1945   return TRUE;
1946 }
1947
1948 static gboolean
1949 parse_binding_set (GtkCssScanner *scanner)
1950 {
1951   GtkBindingSet *binding_set;
1952   char *name;
1953
1954   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1955
1956   if (!_gtk_css_parser_try (scanner->parser, "@binding-set", TRUE))
1957     {
1958       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1959       return FALSE;
1960     }
1961
1962   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1963   if (name == NULL)
1964     {
1965       gtk_css_provider_error_literal (scanner->provider,
1966                                       scanner,
1967                                       GTK_CSS_PROVIDER_ERROR,
1968                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1969                                       "Expected name for binding set");
1970       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1971       goto skip_semicolon;
1972     }
1973
1974   binding_set = gtk_binding_set_find (name);
1975   if (!binding_set)
1976     {
1977       binding_set = gtk_binding_set_new (name);
1978       binding_set->parsed = TRUE;
1979     }
1980   g_free (name);
1981
1982   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
1983     {
1984       gtk_css_provider_error_literal (scanner->provider,
1985                                       scanner,
1986                                       GTK_CSS_PROVIDER_ERROR,
1987                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1988                                       "Expected '{' for binding set");
1989       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1990       goto skip_semicolon;
1991     }
1992
1993   while (!_gtk_css_parser_is_eof (scanner->parser) &&
1994          !_gtk_css_parser_begins_with (scanner->parser, '}'))
1995     {
1996       name = _gtk_css_parser_read_value (scanner->parser);
1997       if (name == NULL)
1998         {
1999           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2000           continue;
2001         }
2002
2003       if (gtk_binding_entry_add_signal_from_string (binding_set, name) != G_TOKEN_NONE)
2004         {
2005           gtk_css_provider_error_literal (scanner->provider,
2006                                           scanner,
2007                                           GTK_CSS_PROVIDER_ERROR,
2008                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2009                                           "Failed to parse binding set.");
2010         }
2011
2012       g_free (name);
2013
2014       if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2015         {
2016           if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2017               !_gtk_css_parser_is_eof (scanner->parser))
2018             {
2019               gtk_css_provider_error_literal (scanner->provider,
2020                                               scanner,
2021                                               GTK_CSS_PROVIDER_ERROR,
2022                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
2023                                               "Expected semicolon");
2024               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2025             }
2026         }
2027     }
2028
2029   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2030     {
2031       gtk_css_provider_error_literal (scanner->provider,
2032                                       scanner,
2033                                       GTK_CSS_PROVIDER_ERROR,
2034                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2035                                       "expected '}' after declarations");
2036       if (!_gtk_css_parser_is_eof (scanner->parser))
2037         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2038     }
2039
2040 skip_semicolon:
2041   if (_gtk_css_parser_begins_with (scanner->parser, ';'))
2042     {
2043       gtk_css_provider_error_literal (scanner->provider,
2044                                       scanner,
2045                                       GTK_CSS_PROVIDER_ERROR,
2046                                       GTK_CSS_PROVIDER_ERROR_DEPRECATED,
2047                                       "Nonstandard semicolon at end of binding set");
2048       _gtk_css_parser_try (scanner->parser, ";", TRUE);
2049     }
2050
2051   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
2052
2053   return TRUE;
2054 }
2055
2056 static void
2057 parse_at_keyword (GtkCssScanner *scanner)
2058 {
2059   if (parse_import (scanner))
2060     return;
2061   if (parse_color_definition (scanner))
2062     return;
2063   if (parse_binding_set (scanner))
2064     return;
2065
2066   else
2067     {
2068       gtk_css_provider_error_literal (scanner->provider,
2069                                       scanner,
2070                                       GTK_CSS_PROVIDER_ERROR,
2071                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2072                                       "unknown @ rule");
2073       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2074     }
2075 }
2076
2077 static GSList *
2078 parse_selector_list (GtkCssScanner *scanner)
2079 {
2080   GSList *selectors = NULL;
2081
2082   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_SELECTOR);
2083
2084   do {
2085       GtkCssSelector *select = _gtk_css_selector_parse (scanner->parser);
2086
2087       if (select == NULL)
2088         {
2089           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2090           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2091           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2092           return NULL;
2093         }
2094
2095       selectors = g_slist_prepend (selectors, select);
2096     }
2097   while (_gtk_css_parser_try (scanner->parser, ",", TRUE));
2098
2099   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2100
2101   return selectors;
2102 }
2103
2104 static void
2105 parse_declaration (GtkCssScanner *scanner,
2106                    GtkCssRuleset *ruleset)
2107 {
2108   GtkStyleProperty *property;
2109   char *name;
2110
2111   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DECLARATION);
2112
2113   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2114   if (name == NULL)
2115     goto check_for_semicolon;
2116
2117   property = _gtk_style_property_lookup (name);
2118   if (property == NULL && name[0] != '-')
2119     {
2120       gtk_css_provider_error (scanner->provider,
2121                               scanner,
2122                               GTK_CSS_PROVIDER_ERROR,
2123                               GTK_CSS_PROVIDER_ERROR_NAME,
2124                               "'%s' is not a valid property name",
2125                               name);
2126       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2127       g_free (name);
2128       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2129       return;
2130     }
2131
2132   if (!_gtk_css_parser_try (scanner->parser, ":", TRUE))
2133     {
2134       gtk_css_provider_invalid_token (scanner->provider, scanner, "':'");
2135       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2136       g_free (name);
2137       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2138       return;
2139     }
2140
2141   if (property)
2142     {
2143       GValue value = { 0, };
2144
2145       g_free (name);
2146
2147       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2148
2149       if (_gtk_style_property_parse_value (property,
2150                                            &value,
2151                                            scanner->parser,
2152                                            gtk_css_scanner_get_base_url (scanner)))
2153         {
2154           if (_gtk_css_parser_begins_with (scanner->parser, ';') ||
2155               _gtk_css_parser_begins_with (scanner->parser, '}') ||
2156               _gtk_css_parser_is_eof (scanner->parser))
2157             {
2158               if (GTK_IS_CSS_SHORTHAND_PROPERTY (property))
2159                 {
2160                   GtkCssShorthandProperty *shorthand = GTK_CSS_SHORTHAND_PROPERTY (property);
2161                   GArray *array = g_value_get_boxed (&value);
2162                   guint i;
2163
2164                   for (i = 0; i < _gtk_css_shorthand_property_get_n_subproperties (shorthand); i++)
2165                     {
2166                       GtkCssStyleProperty *child = _gtk_css_shorthand_property_get_subproperty (shorthand, i);
2167                       const GValue *sub = &g_array_index (array, GValue, i);
2168
2169                       gtk_css_ruleset_add (ruleset, child, sub, scanner->section);
2170                     }
2171                 }
2172               else if (GTK_IS_CSS_STYLE_PROPERTY (property))
2173                 {
2174                   gtk_css_ruleset_add (ruleset, GTK_CSS_STYLE_PROPERTY (property), &value, scanner->section);
2175                 }
2176               else
2177                 {
2178                   g_assert_not_reached ();
2179                 }
2180
2181               g_value_unset (&value);
2182             }
2183           else
2184             {
2185               gtk_css_provider_error_literal (scanner->provider,
2186                                               scanner,
2187                                               GTK_CSS_PROVIDER_ERROR,
2188                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
2189                                               "Junk at end of value");
2190               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2191               gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2192               gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2193               return;
2194             }
2195         }
2196       else
2197         {
2198           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2199           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2200           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2201           return;
2202         }
2203       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2204     }
2205   else if (name[0] == '-')
2206     {
2207       char *value_str;
2208
2209       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2210
2211       value_str = _gtk_css_parser_read_value (scanner->parser);
2212       if (value_str)
2213         {
2214           WidgetPropertyValue *val;
2215
2216           val = widget_property_value_new (name, scanner->section);
2217           val->value = _gtk_css_value_new_take_string (value_str);
2218
2219           gtk_css_ruleset_add_style (ruleset, name, val);
2220         }
2221       else
2222         {
2223           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2224           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2225           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2226           return;
2227         }
2228
2229       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2230     }
2231   else
2232     g_free (name);
2233
2234 check_for_semicolon:
2235   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2236
2237   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2238     {
2239       if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2240           !_gtk_css_parser_is_eof (scanner->parser))
2241         {
2242           gtk_css_provider_error_literal (scanner->provider,
2243                                           scanner,
2244                                           GTK_CSS_PROVIDER_ERROR,
2245                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2246                                           "Expected semicolon");
2247           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2248         }
2249     }
2250 }
2251
2252 static void
2253 parse_declarations (GtkCssScanner *scanner,
2254                     GtkCssRuleset *ruleset)
2255 {
2256   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2257          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2258     {
2259       parse_declaration (scanner, ruleset);
2260     }
2261 }
2262
2263 static void
2264 parse_ruleset (GtkCssScanner *scanner)
2265 {
2266   GSList *selectors;
2267   GtkCssRuleset ruleset = { 0, };
2268
2269   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_RULESET);
2270
2271   selectors = parse_selector_list (scanner);
2272   if (selectors == NULL)
2273     {
2274       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2275       return;
2276     }
2277
2278   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2279     {
2280       gtk_css_provider_error_literal (scanner->provider,
2281                                       scanner,
2282                                       GTK_CSS_PROVIDER_ERROR,
2283                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2284                                       "expected '{' after selectors");
2285       _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2286       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2287       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2288       return;
2289     }
2290
2291   parse_declarations (scanner, &ruleset);
2292
2293   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2294     {
2295       gtk_css_provider_error_literal (scanner->provider,
2296                                       scanner,
2297                                       GTK_CSS_PROVIDER_ERROR,
2298                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2299                                       "expected '}' after declarations");
2300       if (!_gtk_css_parser_is_eof (scanner->parser))
2301         {
2302           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2303           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2304           gtk_css_ruleset_clear (&ruleset);
2305           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2306         }
2307     }
2308
2309   css_provider_commit (scanner->provider, selectors, &ruleset);
2310   gtk_css_ruleset_clear (&ruleset);
2311   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2312 }
2313
2314 static void
2315 parse_statement (GtkCssScanner *scanner)
2316 {
2317   if (_gtk_css_parser_begins_with (scanner->parser, '@'))
2318     parse_at_keyword (scanner);
2319   else
2320     parse_ruleset (scanner);
2321 }
2322
2323 static void
2324 parse_stylesheet (GtkCssScanner *scanner)
2325 {
2326   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2327
2328   _gtk_css_parser_skip_whitespace (scanner->parser);
2329
2330   while (!_gtk_css_parser_is_eof (scanner->parser))
2331     {
2332       if (_gtk_css_parser_try (scanner->parser, "<!--", TRUE) ||
2333           _gtk_css_parser_try (scanner->parser, "-->", TRUE))
2334         continue;
2335
2336       parse_statement (scanner);
2337     }
2338
2339   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2340 }
2341
2342 static int
2343 gtk_css_provider_compare_rule (gconstpointer a_,
2344                                gconstpointer b_)
2345 {
2346   const GtkCssRuleset *a = (const GtkCssRuleset *) a_;
2347   const GtkCssRuleset *b = (const GtkCssRuleset *) b_;
2348   int compare;
2349
2350   compare = _gtk_css_selector_compare (a->selector, b->selector);
2351   if (compare != 0)
2352     return compare;
2353
2354   return 0;
2355 }
2356
2357 static void
2358 gtk_css_provider_postprocess (GtkCssProvider *css_provider)
2359 {
2360   GtkCssProviderPrivate *priv = css_provider->priv;
2361
2362   g_array_sort (priv->rulesets, gtk_css_provider_compare_rule);
2363 }
2364
2365 static gboolean
2366 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
2367                                 GtkCssScanner  *parent,
2368                                 GFile          *file,
2369                                 const char     *text,
2370                                 GError        **error)
2371 {
2372   GtkCssScanner *scanner;
2373   gulong error_handler;
2374   char *free_data = NULL;
2375
2376   if (error)
2377     error_handler = g_signal_connect (css_provider,
2378                                       "parsing-error",
2379                                       G_CALLBACK (gtk_css_provider_propagate_error),
2380                                       error);
2381   else
2382     error_handler = 0; /* silence gcc */
2383
2384   if (text == NULL)
2385     {
2386       GError *load_error = NULL;
2387
2388       if (g_file_load_contents (file, NULL,
2389                                 &free_data, NULL,
2390                                 NULL, &load_error))
2391         {
2392           text = free_data;
2393         }
2394       else
2395         {
2396           GtkCssSection *section;
2397
2398           if (parent)
2399             section = gtk_css_section_ref (parent->section);
2400           else
2401             section = _gtk_css_section_new_for_file (GTK_CSS_SECTION_DOCUMENT, file);
2402
2403           gtk_css_provider_error (css_provider,
2404                                   parent,
2405                                   GTK_CSS_PROVIDER_ERROR,
2406                                   GTK_CSS_PROVIDER_ERROR_IMPORT,
2407                                   "Failed to import: %s",
2408                                   load_error->message);
2409
2410           gtk_css_section_unref (section);
2411         }
2412     }
2413
2414   if (text)
2415     {
2416       scanner = gtk_css_scanner_new (css_provider,
2417                                      parent,
2418                                      parent ? parent->section : NULL,
2419                                      file,
2420                                      text);
2421
2422       parse_stylesheet (scanner);
2423
2424       gtk_css_scanner_destroy (scanner);
2425
2426       if (parent == NULL)
2427         gtk_css_provider_postprocess (css_provider);
2428     }
2429
2430   g_free (free_data);
2431
2432   if (error)
2433     {
2434       g_signal_handler_disconnect (css_provider, error_handler);
2435
2436       if (*error)
2437         {
2438           /* We clear all contents from the provider for backwards compat reasons */
2439           gtk_css_provider_reset (css_provider);
2440           return FALSE;
2441         }
2442     }
2443
2444   return TRUE;
2445 }
2446
2447 /**
2448  * gtk_css_provider_load_from_data:
2449  * @css_provider: a #GtkCssProvider
2450  * @data: (array length=length) (element-type guint8): CSS data loaded in memory
2451  * @length: the length of @data in bytes, or -1 for NUL terminated strings. If
2452  *   @length is not -1, the code will assume it is not NUL terminated and will
2453  *   potentially do a copy.
2454  * @error: (out) (allow-none): return location for a #GError, or %NULL
2455  *
2456  * Loads @data into @css_provider, making it clear any previously loaded
2457  * information.
2458  *
2459  * Returns: %TRUE if the data could be loaded.
2460  **/
2461 gboolean
2462 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2463                                  const gchar     *data,
2464                                  gssize           length,
2465                                  GError         **error)
2466 {
2467   char *free_data;
2468   gboolean ret;
2469
2470   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2471   g_return_val_if_fail (data != NULL, FALSE);
2472
2473   if (length < 0)
2474     {
2475       length = strlen (data);
2476       free_data = NULL;
2477     }
2478   else
2479     {
2480       free_data = g_strndup (data, length);
2481       data = free_data;
2482     }
2483
2484   gtk_css_provider_reset (css_provider);
2485
2486   ret = gtk_css_provider_load_internal (css_provider, NULL, NULL, data, error);
2487
2488   g_free (free_data);
2489
2490   return ret;
2491 }
2492
2493 /**
2494  * gtk_css_provider_load_from_file:
2495  * @css_provider: a #GtkCssProvider
2496  * @file: #GFile pointing to a file to load
2497  * @error: (out) (allow-none): return location for a #GError, or %NULL
2498  *
2499  * Loads the data contained in @file into @css_provider, making it
2500  * clear any previously loaded information.
2501  *
2502  * Returns: %TRUE if the data could be loaded.
2503  **/
2504 gboolean
2505 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2506                                  GFile           *file,
2507                                  GError         **error)
2508 {
2509   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2510   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2511
2512   gtk_css_provider_reset (css_provider);
2513
2514   return gtk_css_provider_load_internal (css_provider, NULL, file, NULL, error);
2515 }
2516
2517 /**
2518  * gtk_css_provider_load_from_path:
2519  * @css_provider: a #GtkCssProvider
2520  * @path: the path of a filename to load, in the GLib filename encoding
2521  * @error: (out) (allow-none): return location for a #GError, or %NULL
2522  *
2523  * Loads the data contained in @path into @css_provider, making it clear
2524  * any previously loaded information.
2525  *
2526  * Returns: %TRUE if the data could be loaded.
2527  **/
2528 gboolean
2529 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2530                                  const gchar     *path,
2531                                  GError         **error)
2532 {
2533   GFile *file;
2534   gboolean result;
2535
2536   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2537   g_return_val_if_fail (path != NULL, FALSE);
2538
2539   file = g_file_new_for_path (path);
2540
2541   result = gtk_css_provider_load_from_file (css_provider, file, error);
2542
2543   g_object_unref (file);
2544
2545   return result;
2546 }
2547
2548 static gboolean
2549 _gtk_css_provider_load_from_resource (GtkCssProvider  *css_provider,
2550                                       const gchar     *resource_path)
2551 {
2552   GFile *file;
2553   char *uri, *escaped;
2554   gboolean result;
2555
2556   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2557   g_return_val_if_fail (resource_path != NULL, FALSE);
2558
2559   escaped = g_uri_escape_string (resource_path,
2560                                  G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, FALSE);
2561   uri = g_strconcat ("resource://", escaped, NULL);
2562   g_free (escaped);
2563
2564   file = g_file_new_for_uri (uri);
2565   g_free (uri);
2566
2567   result = gtk_css_provider_load_from_file (css_provider, file, NULL);
2568
2569   g_object_unref (file);
2570
2571   return result;
2572 }
2573
2574 /**
2575  * gtk_css_provider_get_default:
2576  *
2577  * Returns the provider containing the style settings used as a
2578  * fallback for all widgets.
2579  *
2580  * Returns: (transfer none): The provider used for fallback styling.
2581  *          This memory is owned by GTK+, and you must not free it.
2582  **/
2583 GtkCssProvider *
2584 gtk_css_provider_get_default (void)
2585 {
2586   static GtkCssProvider *provider;
2587
2588   if (G_UNLIKELY (!provider))
2589     {
2590       provider = gtk_css_provider_new ();
2591     }
2592
2593   return provider;
2594 }
2595
2596 gchar *
2597 _gtk_css_provider_get_theme_dir (void)
2598 {
2599   const gchar *var;
2600   gchar *path;
2601
2602   var = g_getenv ("GTK_DATA_PREFIX");
2603
2604   if (var)
2605     path = g_build_filename (var, "share", "themes", NULL);
2606   else
2607     path = g_build_filename (_gtk_get_data_prefix (), "share", "themes", NULL);
2608
2609   return path;
2610 }
2611
2612 /**
2613  * gtk_css_provider_get_named:
2614  * @name: A theme name
2615  * @variant: (allow-none): variant to load, for example, "dark", or
2616  *     %NULL for the default
2617  *
2618  * Loads a theme from the usual theme paths
2619  *
2620  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
2621  *     This memory is owned by GTK+, and you must not free it.
2622  */
2623 GtkCssProvider *
2624 gtk_css_provider_get_named (const gchar *name,
2625                             const gchar *variant)
2626 {
2627   static GHashTable *themes = NULL;
2628   GtkCssProvider *provider;
2629   gchar *key;
2630
2631   if (variant == NULL)
2632     key = (gchar *)name;
2633   else
2634     key = g_strconcat (name, "-", variant, NULL);
2635
2636   if (G_UNLIKELY (!themes))
2637     themes = g_hash_table_new (g_str_hash, g_str_equal);
2638
2639   provider = g_hash_table_lookup (themes, key);
2640
2641   if (!provider)
2642     {
2643       gchar *resource_path = NULL;
2644
2645       if (variant)
2646         resource_path = g_strdup_printf ("/org/gtk/libgtk/%s-%s.css", name, variant);
2647       else
2648         resource_path = g_strdup_printf ("/org/gtk/libgtk/%s.css", name);
2649
2650       if (g_resources_get_info (resource_path, 0, NULL, NULL, NULL))
2651         {
2652           provider = gtk_css_provider_new ();
2653           if (!_gtk_css_provider_load_from_resource (provider, resource_path))
2654             {
2655               g_object_unref (provider);
2656               provider = NULL;
2657             }
2658         }
2659       g_free (resource_path);
2660     }
2661
2662   if (!provider)
2663     {
2664       const gchar *home_dir;
2665       gchar *subpath, *path = NULL;
2666
2667       if (variant)
2668         subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
2669       else
2670         subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
2671
2672       /* First look in the users home directory
2673        */
2674       home_dir = g_get_home_dir ();
2675       if (home_dir)
2676         {
2677           path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
2678
2679           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2680             {
2681               g_free (path);
2682               path = NULL;
2683             }
2684         }
2685
2686       if (!path)
2687         {
2688           gchar *theme_dir;
2689
2690           theme_dir = _gtk_css_provider_get_theme_dir ();
2691           path = g_build_filename (theme_dir, name, subpath, NULL);
2692           g_free (theme_dir);
2693
2694           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2695             {
2696               g_free (path);
2697               path = NULL;
2698             }
2699         }
2700
2701       g_free (subpath);
2702
2703       if (path)
2704         {
2705           char *dir, *resource_file;
2706           GResource *resource;
2707
2708           provider = gtk_css_provider_new ();
2709
2710           dir = g_path_get_dirname (path);
2711           resource_file = g_build_filename (dir, "gtk.gresource", NULL);
2712           resource = g_resource_load (resource_file, NULL);
2713           g_free (resource_file);
2714
2715           if (resource != NULL)
2716             g_resources_register (resource);
2717
2718           if (!gtk_css_provider_load_from_path (provider, path, NULL))
2719             {
2720               if (resource != NULL)
2721                 {
2722                   g_resources_unregister (resource);
2723                   g_resource_unref (resource);
2724                 }
2725               g_object_unref (provider);
2726               provider = NULL;
2727             }
2728           else
2729             {
2730               /* Only set this after load success, as load_from_path will clear it */
2731               provider->priv->resource = resource;
2732               g_hash_table_insert (themes, g_strdup (key), provider);
2733             }
2734
2735           g_free (path);
2736           g_free (dir);
2737         }
2738     }
2739
2740   if (key != name)
2741     g_free (key);
2742
2743   return provider;
2744 }
2745
2746 static int
2747 compare_properties (gconstpointer a, gconstpointer b, gpointer style)
2748 {
2749   const guint *ua = a;
2750   const guint *ub = b;
2751   PropertyValue *styles = style;
2752
2753   return strcmp (_gtk_style_property_get_name (GTK_STYLE_PROPERTY (styles[*ua].property)),
2754                  _gtk_style_property_get_name (GTK_STYLE_PROPERTY (styles[*ub].property)));
2755 }
2756
2757 static int
2758 compare_names (gconstpointer a, gconstpointer b)
2759 {
2760   const WidgetPropertyValue *aa = a;
2761   const WidgetPropertyValue *bb = b;
2762   return strcmp (aa->name, bb->name);
2763 }
2764
2765 static void
2766 gtk_css_ruleset_print (const GtkCssRuleset *ruleset,
2767                        GString             *str)
2768 {
2769   GList *values, *walk;
2770   WidgetPropertyValue *widget_value;
2771   guint i;
2772
2773   _gtk_css_selector_print (ruleset->selector, str);
2774
2775   g_string_append (str, " {\n");
2776
2777   if (ruleset->styles)
2778     {
2779       guint *sorted = g_new (guint, ruleset->n_styles);
2780
2781       for (i = 0; i < ruleset->n_styles; i++)
2782         sorted[i] = i;
2783
2784       /* so the output is identical for identical selector styles */
2785       g_qsort_with_data (sorted, ruleset->n_styles, sizeof (guint), compare_properties, ruleset->styles);
2786
2787       for (i = 0; i < ruleset->n_styles; i++)
2788         {
2789           PropertyValue *prop = &ruleset->styles[sorted[i]];
2790           g_string_append (str, "  ");
2791           g_string_append (str, _gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop->property)));
2792           g_string_append (str, ": ");
2793           _gtk_css_style_property_print_value (prop->property, prop->value, str);
2794           g_string_append (str, ";\n");
2795         }
2796
2797       g_free (sorted);
2798     }
2799
2800   if (ruleset->widget_style)
2801     {
2802       values = NULL;
2803       for (widget_value = ruleset->widget_style; widget_value != NULL; widget_value = widget_value->next)
2804         values = g_list_prepend (values, widget_value);
2805
2806       /* so the output is identical for identical selector styles */
2807       values = g_list_sort (values, compare_names);
2808
2809       for (walk = values; walk; walk = walk->next)
2810         {
2811           widget_value = walk->data;
2812
2813           g_string_append (str, "  ");
2814           g_string_append (str, widget_value->name);
2815           g_string_append (str, ": ");
2816           g_string_append (str, _gtk_css_value_get_string (widget_value->value));
2817           g_string_append (str, ";\n");
2818         }
2819
2820       g_list_free (values);
2821     }
2822
2823   g_string_append (str, "}\n");
2824 }
2825
2826 static void
2827 gtk_css_provider_print_colors (GHashTable *colors,
2828                                GString    *str)
2829 {
2830   GList *keys, *walk;
2831   char *s;
2832
2833   keys = g_hash_table_get_keys (colors);
2834   /* so the output is identical for identical styles */
2835   keys = g_list_sort (keys, (GCompareFunc) strcmp);
2836
2837   for (walk = keys; walk; walk = walk->next)
2838     {
2839       const char *name = walk->data;
2840       GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
2841
2842       g_string_append (str, "@define-color ");
2843       g_string_append (str, name);
2844       g_string_append (str, " ");
2845       s = gtk_symbolic_color_to_string (symbolic);
2846       g_string_append (str, s);
2847       g_free (s);
2848       g_string_append (str, ";\n");
2849     }
2850
2851   g_list_free (keys);
2852 }
2853
2854 /**
2855  * gtk_css_provider_to_string:
2856  * @provider: the provider to write to a string
2857  *
2858  * Convertes the @provider into a string representation in CSS
2859  * format.
2860  *
2861  * Using gtk_css_provider_load_from_data() with the return value
2862  * from this function on a new provider created with
2863  * gtk_css_provider_new() will basicallu create a duplicate of
2864  * this @provider.
2865  *
2866  * Returns: a new string representing the @provider.
2867  *
2868  * Since: 3.2
2869  **/
2870 char *
2871 gtk_css_provider_to_string (GtkCssProvider *provider)
2872 {
2873   GtkCssProviderPrivate *priv;
2874   GString *str;
2875   guint i;
2876
2877   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
2878
2879   priv = provider->priv;
2880
2881   str = g_string_new ("");
2882
2883   gtk_css_provider_print_colors (priv->symbolic_colors, str);
2884
2885   for (i = 0; i < priv->rulesets->len; i++)
2886     {
2887       if (i > 0)
2888         g_string_append (str, "\n");
2889       gtk_css_ruleset_print (&g_array_index (priv->rulesets, GtkCssRuleset, i), str);
2890     }
2891
2892   return g_string_free (str, FALSE);
2893 }
2894