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 "gtkcssarrayvalueprivate.h"
  30 #include "gtkcsskeyframesprivate.h"
  31 #include "gtkcssparserprivate.h"
  32 #include "gtkcsssectionprivate.h"
  33 #include "gtkcssselectorprivate.h"
  34 #include "gtkcssshorthandpropertyprivate.h"
  35 #include "gtkcssstylefuncsprivate.h"
  36 #include "gtksymboliccolor.h"
  37 #include "gtkstyleprovider.h"
  38 #include "gtkstylecontextprivate.h"
  39 #include "gtkstylepropertiesprivate.h"
  40 #include "gtkstylepropertyprivate.h"
  41 #include "gtkstyleproviderprivate.h"
  42 #include "gtkbindings.h"
  43 #include "gtkmarshalers.h"
  44 #include "gtkprivate.h"
  45 #include "gtkintl.h"
  46
  47 /**
  48  * SECTION:gtkcssprovider
  49  * @Short_description: CSS-like styling for widgets
  50  * @Title: GtkCssProvider
  51  * @See_also: #GtkStyleContext, #GtkStyleProvider
  52  *
  53  * GtkCssProvider is an object implementing the #GtkStyleProvider interface.
  54  * It is able to parse <ulink url="http://www.w3.org/TR/CSS2">CSS</ulink>-like
  55  * input in order to style widgets.
  56  *
  57  * <refsect2 id="gtkcssprovider-files">
  58  * <title>Default files</title>
  59  * <para>
  60  * An application can cause GTK+ to parse a specific CSS style sheet by
  61  * calling gtk_css_provider_load_from_file() and adding the provider with
  62  * gtk_style_context_add_provider() or gtk_style_context_add_provider_for_screen().
  63  * In addition, certain files will be read when GTK+ is initialized. First,
  64  * the file <filename><envar>$XDG_CONFIG_HOME</envar>/gtk-3.0/gtk.css</filename>
  65  * is loaded if it exists. Then, GTK+ tries to load
  66  * <filename><envar>$HOME</envar>/.themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  67  * falling back to
  68  * <filename><replaceable>datadir</replaceable>/share/themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
  69  * where <replaceable>theme-name</replaceable> is the name of the current theme
  70  * (see the #GtkSettings:gtk-theme-name setting) and <replaceable>datadir</replaceable>
  71  * is the prefix configured when GTK+ was compiled, unless overridden by the
  72  * <envar>GTK_DATA_PREFIX</envar> environment variable.
  73  * </para>
  74  * </refsect2>
  75  * <refsect2 id="gtkcssprovider-stylesheets">
  76  * <title>Style sheets</title>
  77  * <para>
  78  * The basic structure of the style sheets understood by this provider is
  79  * a series of statements, which are either rule sets or '@-rules', separated
  80  * by whitespace.
  81  * </para>
  82  * <para>
  83  * A rule set consists of a selector and a declaration block, which is
  84  * a series of declarations enclosed in curly braces ({ and }). The
  85  * declarations are separated by semicolons (;). Multiple selectors can
  86  * share the same declaration block, by putting all the separators in
  87  * front of the block, separated by commas.
  88  * </para>
  89  * <example><title>A rule set with two selectors</title>
  90  * <programlisting language="text">
  91  * GtkButton, GtkEntry {
  92  *     color: &num;ff00ea;
  93  *     font: Comic Sans 12
  94  * }
  95  * </programlisting>
  96  * </example>
  97  * </refsect2>
  98  * <refsect2 id="gtkcssprovider-selectors">
  99  * <title>Selectors</title>
 100  * <para>
 101  * Selectors work very similar to the way they do in CSS, with widget class
 102  * names taking the role of element names, and widget names taking the role
 103  * of IDs. When used in a selector, widget names must be prefixed with a
 104  * '&num;' character. The '*' character represents the so-called universal
 105  * selector, which matches any widget.
 106  * </para>
 107  * <para>
 108  * To express more complicated situations, selectors can be combined in
 109  * various ways:
 110  * <itemizedlist>
 111  * <listitem><para>To require that a widget satisfies several conditions,
 112  *   combine several selectors into one by concatenating them. E.g.
 113  *   <literal>GtkButton&num;button1</literal> matches a GtkButton widget
 114  *   with the name button1.</para></listitem>
 115  * <listitem><para>To only match a widget when it occurs inside some other
 116  *   widget, write the two selectors after each other, separated by whitespace.
 117  *   E.g. <literal>GtkToolBar GtkButton</literal> matches GtkButton widgets
 118  *   that occur inside a GtkToolBar.</para></listitem>
 119  * <listitem><para>In the previous example, the GtkButton is matched even
 120  *   if it occurs deeply nested inside the toolbar. To restrict the match
 121  *   to direct children of the parent widget, insert a '>' character between
 122  *   the two selectors. E.g. <literal>GtkNotebook > GtkLabel</literal> matches
 123  *   GtkLabel widgets that are direct children of a GtkNotebook.</para></listitem>
 124  * </itemizedlist>
 125  * </para>
 126  * <example>
 127  * <title>Widget classes and names in selectors</title>
 128  * <programlisting language="text">
 129  * /&ast; Theme labels that are descendants of a window &ast;/
 130  * GtkWindow GtkLabel {
 131  *     background-color: &num;898989
 132  * }
 133  *
 134  * /&ast; Theme notebooks, and anything that's within these &ast;/
 135  * GtkNotebook {
 136  *     background-color: &num;a939f0
 137  * }
 138  *
 139  * /&ast; Theme combo boxes, and entries that
 140  *  are direct children of a notebook &ast;/
 141  * GtkComboBox,
 142  * GtkNotebook > GtkEntry {
 143  *     color: @fg_color;
 144  *     background-color: &num;1209a2
 145  * }
 146  *
 147  * /&ast; Theme any widget within a GtkBin &ast;/
 148  * GtkBin * {
 149  *     font: Sans 20
 150  * }
 151  *
 152  * /&ast; Theme a label named title-label &ast;/
 153  * GtkLabel&num;title-label {
 154  *     font: Sans 15
 155  * }
 156  *
 157  * /&ast; Theme any widget named main-entry &ast;/
 158  * &num;main-entry {
 159  *     background-color: &num;f0a810
 160  * }
 161  * </programlisting>
 162  * </example>
 163  * <para>
 164  * Widgets may also define style classes, which can be used for matching.
 165  * When used in a selector, style classes must be prefixed with a '.'
 166  * character.
 167  * </para>
 168  * <para>
 169  * Refer to the documentation of individual widgets to learn which
 170  * style classes they define and see <xref linkend="gtkstylecontext-classes"/>
 171  * for a list of all style classes used by GTK+ widgets.
 172  * </para>
 173  * <para>
 174  * Note that there is some ambiguity in the selector syntax when it comes
 175  * to differentiation widget class names from regions. GTK+ currently treats
 176  * a string as a widget class name if it contains any uppercase characters
 177  * (which should work for more widgets with names like GtkLabel).
 178  * </para>
 179  * <example>
 180  * <title>Style classes in selectors</title>
 181  * <programlisting language="text">
 182  * /&ast; Theme all widgets defining the class entry &ast;/
 183  * .entry {
 184  *     color: &num;39f1f9;
 185  * }
 186  *
 187  * /&ast; Theme spinbuttons' entry &ast;/
 188  * GtkSpinButton.entry {
 189  *     color: &num;900185
 190  * }
 191  * </programlisting>
 192  * </example>
 193  * <para>
 194  * In complicated widgets like e.g. a GtkNotebook, it may be desirable
 195  * to style different parts of the widget differently. To make this
 196  * possible, container widgets may define regions, whose names
 197  * may be used for matching in selectors.
 198  * </para>
 199  * <para>
 200  * Some containers allow to further differentiate between regions by
 201  * applying so-called pseudo-classes to the region. For example, the
 202  * tab region in GtkNotebook allows to single out the first or last
 203  * tab by using the :first-child or :last-child pseudo-class.
 204  * When used in selectors, pseudo-classes must be prefixed with a
 205  * ':' character.
 206  * </para>
 207  * <para>
 208  * Refer to the documentation of individual widgets to learn which
 209  * regions and pseudo-classes they define and see
 210  * <xref linkend="gtkstylecontext-classes"/> for a list of all regions
 211  * used by GTK+ widgets.
 212  * </para>
 213  * <example>
 214  * <title>Regions in selectors</title>
 215  * <programlisting language="text">
 216  * /&ast; Theme any label within a notebook &ast;/
 217  * GtkNotebook GtkLabel {
 218  *     color: &num;f90192;
 219  * }
 220  *
 221  * /&ast; Theme labels within notebook tabs &ast;/
 222  * GtkNotebook tab GtkLabel {
 223  *     color: &num;703910;
 224  * }
 225  *
 226  * /&ast; Theme labels in the any first notebook
 227  *  tab, both selectors are equivalent &ast;/
 228  * GtkNotebook tab:nth-child(first) GtkLabel,
 229  * GtkNotebook tab:first-child GtkLabel {
 230  *     color: &num;89d012;
 231  * }
 232  * </programlisting>
 233  * </example>
 234  * <para>
 235  * Another use of pseudo-classes is to match widgets depending on their
 236  * state. This is conceptually similar to the :hover, :active or :focus
 237  * pseudo-classes in CSS. The available pseudo-classes for widget states
 238  * are :active, :prelight (or :hover), :insensitive, :selected, :focused
 239  * and :inconsistent.
 240  * </para>
 241  * <example>
 242  * <title>Styling specific widget states</title>
 243  * <programlisting language="text">
 244  * /&ast; Theme active (pressed) buttons &ast;/
 245  * GtkButton:active {
 246  *     background-color: &num;0274d9;
 247  * }
 248  *
 249  * /&ast; Theme buttons with the mouse pointer on it,
 250  *    both are equivalent &ast;/
 251  * GtkButton:hover,
 252  * GtkButton:prelight {
 253  *     background-color: &num;3085a9;
 254  * }
 255  *
 256  * /&ast; Theme insensitive widgets, both are equivalent &ast;/
 257  * :insensitive,
 258  * *:insensitive {
 259  *     background-color: &num;320a91;
 260  * }
 261  *
 262  * /&ast; Theme selection colors in entries &ast;/
 263  * GtkEntry:selected {
 264  *     background-color: &num;56f9a0;
 265  * }
 266  *
 267  * /&ast; Theme focused labels &ast;/
 268  * GtkLabel:focused {
 269  *     background-color: &num;b4940f;
 270  * }
 271  *
 272  * /&ast; Theme inconsistent checkbuttons &ast;/
 273  * GtkCheckButton:inconsistent {
 274  *     background-color: &num;20395a;
 275  * }
 276  * </programlisting>
 277  * </example>
 278  * <para>
 279  * Widget state pseudoclasses may only apply to the last element
 280  * in a selector.
 281  * </para>
 282  * <para>
 283  * To determine the effective style for a widget, all the matching rule
 284  * sets are merged. As in CSS, rules apply by specificity, so the rules
 285  * whose selectors more closely match a widget path will take precedence
 286  * over the others.
 287  * </para>
 288  * </refsect2>
 289  * <refsect2 id="gtkcssprovider-rules">
 290  * <title>&commat; Rules</title>
 291  * <para>
 292  * GTK+'s CSS supports the &commat;import rule, in order to load another
 293  * CSS style sheet in addition to the currently parsed one.
 294  * </para>
 295  * <example>
 296  * <title>Using the &commat;import rule</title>
 297  * <programlisting language="text">
 298  * &commat;import url ("path/to/common.css");
 299  * </programlisting>
 300  * </example>
 301  * <para id="css-binding-set">
 302  * In order to extend key bindings affecting different widgets, GTK+
 303  * supports the &commat;binding-set rule to parse a set of bind/unbind
 304  * directives, see #GtkBindingSet for the supported syntax. Note that
 305  * the binding sets defined in this way must be associated with rule sets
 306  * by setting the gtk-key-bindings style property.
 307  * </para>
 308  * <para>
 309  * Customized key bindings are typically defined in a separate
 310  * <filename>gtk-keys.css</filename> CSS file and GTK+ loads this file
 311  * according to the current key theme, which is defined by the
 312  * #GtkSettings:gtk-key-theme-name setting.
 313  * </para>
 314  * <example>
 315  * <title>Using the &commat;binding rule</title>
 316  * <programlisting language="text">
 317  * &commat;binding-set binding-set1 {
 318  *   bind "&lt;alt&gt;Left" { "move-cursor" (visual-positions, -3, 0) };
 319  *   unbind "End";
 320  * };
 321  *
 322  * &commat;binding-set binding-set2 {
 323  *   bind "&lt;alt&gt;Right" { "move-cursor" (visual-positions, 3, 0) };
 324  *   bind "&lt;alt&gt;KP_space" { "delete-from-cursor" (whitespace, 1)
 325  *                          "insert-at-cursor" (" ") };
 326  * };
 327  *
 328  * GtkEntry {
 329  *   gtk-key-bindings: binding-set1, binding-set2;
 330  * }
 331  * </programlisting>
 332  * </example>
 333  * <para>
 334  * GTK+ also supports an additional &commat;define-color rule, in order
 335  * to define a color name which may be used instead of color numeric
 336  * representations. Also see the #GtkSettings:gtk-color-scheme setting
 337  * for a way to override the values of these named colors.
 338  * </para>
 339  * <example>
 340  * <title>Defining colors</title>
 341  * <programlisting language="text">
 342  * &commat;define-color bg_color &num;f9a039;
 343  *
 344  * &ast; {
 345  *     background-color: &commat;bg_color;
 346  * }
 347  * </programlisting>
 348  * </example>
 349  * </refsect2>
 350  * <refsect2 id="gtkcssprovider-symbolic-colors">
 351  * <title>Symbolic colors</title>
 352  * <para>
 353  * Besides being able to define color names, the CSS parser is also able
 354  * to read different color expressions, which can also be nested, providing
 355  * a rich language to define colors which are derived from a set of base
 356  * colors.
 357  * </para>
 358  * <example>
 359  * <title>Using symbolic colors</title>
 360  * <programlisting language="text">
 361  * &commat;define-color entry-color shade (&commat;bg_color, 0.7);
 362  *
 363  * GtkEntry {
 364  *     background-color: @entry-color;
 365  * }
 366  *
 367  * GtkEntry:focused {
 368  *     background-color: mix (&commat;entry-color,
 369  *                            shade (&num;fff, 0.5),
 370  *                            0.8);
 371  * }
 372  * </programlisting>
 373  * </example>
 374  * <para>
 375  *   The various ways to express colors in GTK+ CSS are:
 376  * </para>
 377  * <informaltable>
 378  *   <tgroup cols="3">
 379  *     <thead>
 380  *       <row>
 381  *         <entry>Syntax</entry>
 382  *         <entry>Explanation</entry>
 383  *         <entry>Examples</entry>
 384  *       </row>
 385  *     </thead>
 386  *     <tbody>
 387  *       <row>
 388  *         <entry>rgb(@r, @g, @b)</entry>
 389  *         <entry>An opaque color; @r, @g, @b can be either integers between
 390  *                0 and 255 or percentages</entry>
 391  *         <entry><literallayout>rgb(128, 10, 54)
 392  * rgb(20%, 30%, 0%)</literallayout></entry>
 393  *       </row>
 394  *       <row>
 395  *         <entry>rgba(@r, @g, @b, @a)</entry>
 396  *         <entry>A translucent color; @r, @g, @b are as in the previous row,
 397  *                @a is a floating point number between 0 and 1</entry>
 398  *         <entry><literallayout>rgba(255, 255, 0, 0.5)</literallayout></entry>
 399  *       </row>
 400  *       <row>
 401  *         <entry>&num;@xxyyzz</entry>
 402  *         <entry>An opaque color; @xx, @yy, @zz are hexadecimal numbers
 403  *                specifying @r, @g, @b variants with between 1 and 4
 404  *                hexadecimal digits per component are allowed</entry>
 405  *         <entry><literallayout>&num;ff12ab
 406  * &num;f0c</literallayout></entry>
 407  *       </row>
 408  *       <row>
 409  *         <entry>&commat;name</entry>
 410  *         <entry>Reference to a color that has been defined with
 411  *                &commat;define-color
 412  *         </entry>
 413  *         <entry>&commat;bg_color</entry>
 414  *       </row>
 415  *       <row>
 416  *         <entry>mix(@color1, @color2, @f)</entry>
 417  *         <entry>A linear combination of @color1 and @color2. @f is a
 418  *                floating point number between 0 and 1.</entry>
 419  *         <entry><literallayout>mix(&num;ff1e0a, &commat;bg_color, 0.8)</literallayout></entry>
 420  *       </row>
 421  *       <row>
 422  *         <entry>shade(@color, @f)</entry>
 423  *         <entry>A lighter or darker variant of @color. @f is a
 424  *                floating point number.
 425  *         </entry>
 426  *         <entry>shade(&commat;fg_color, 0.5)</entry>
 427  *       </row>
 428  *       <row>
 429  *         <entry>lighter(@color)</entry>
 430  *         <entry>A lighter variant of @color</entry>
 431  *       </row>
 432  *       <row>
 433  *         <entry>darker(@color)</entry>
 434  *         <entry>A darker variant of @color</entry>
 435  *       </row>
 436  *       <row>
 437  *         <entry>alpha(@color, @f)</entry>
 438  *         <entry>Modifies passed color's alpha by a factor @f. @f is a
 439  *                floating point number. @f < 1.0 results in a more transparent
 440  *                color while @f > 1.0 results in a more opaque color.
 441  *         </entry>
 442  *         <entry>alhpa(blue, 0.5)</entry>
 443  *       </row>
 444  *     </tbody>
 445  *   </tgroup>
 446  * </informaltable>
 447  * </refsect2>
 448  * <refsect2 id="gtkcssprovider-gradients">
 449  * <title>Gradients</title>
 450  * <para>
 451  * Linear or radial Gradients can be used as background images.
 452  * </para>
 453  * <para>
 454  * A linear gradient along the line from (@start_x, @start_y) to
 455  * (@end_x, @end_y) is specified using the syntax
 456  * <literallayout>-gtk-gradient (linear,
 457  *               @start_x @start_y, @end_x @end_y,
 458  *               color-stop (@position, @color),
 459  *               ...)</literallayout>
 460  * where @start_x and @end_x can be either a floating point number between
 461  * 0 and 1 or one of the special values 'left', 'right' or 'center', @start_y
 462  * and @end_y can be either a floating point number between 0 and 1 or one
 463  * of the special values 'top', 'bottom' or 'center', @position is a floating
 464  * point number between 0 and 1 and @color is a color expression (see above).
 465  * The color-stop can be repeated multiple times to add more than one color
 466  * stop. 'from (@color)' and 'to (@color)' can be used as abbreviations for
 467  * color stops with position 0 and 1, respectively.
 468  * </para>
 469  * <example>
 470  * <title>A linear gradient</title>
 471  * <inlinegraphic fileref="gradient1.png" format="PNG"/>
 472  * <para>This gradient was specified with
 473  * <literallayout>-gtk-gradient (linear,
 474  *                left top, right bottom,
 475  *                from(&commat;yellow), to(&commat;blue))</literallayout></para>
 476  * </example>
 477  * <example>
 478  * <title>Another linear gradient</title>
 479  * <inlinegraphic fileref="gradient2.png" format="PNG"/>
 480  * <para>This gradient was specified with
 481  * <literallayout>-gtk-gradient (linear,
 482  *                0 0, 0 1,
 483  *                color-stop(0, &commat;yellow),
 484  *                color-stop(0.2, &commat;blue),
 485  *                color-stop(1, &num;0f0))</literallayout></para>
 486  * </example>
 487  * <para>
 488  * A radial gradient along the two circles defined by (@start_x, @start_y,
 489  * @start_radius) and (@end_x, @end_y, @end_radius) is specified using the
 490  * syntax
 491  * <literallayout>-gtk-gradient (radial,
 492  *                @start_x @start_y, @start_radius,
 493  *                @end_x @end_y, @end_radius,
 494  *                color-stop (@position, @color),
 495  *                ...)</literallayout>
 496  * where @start_radius and @end_radius are floating point numbers and
 497  * the other parameters are as before.
 498  * </para>
 499  * <example>
 500  * <title>A radial gradient</title>
 501  * <inlinegraphic fileref="gradient3.png" format="PNG"/>
 502  * <para>This gradient was specified with
 503  * <literallayout>-gtk-gradient (radial,
 504  *                center center, 0,
 505  *                center center, 1,
 506  *                from(&commat;yellow), to(&commat;green))</literallayout></para>
 507  * </example>
 508  * <example>
 509  * <title>Another radial gradient</title>
 510  * <inlinegraphic fileref="gradient4.png" format="PNG"/>
 511  * <para>This gradient was specified with
 512  * <literallayout>-gtk-gradient (radial,
 513  *                0.4 0.4, 0.1,
 514  *                0.6 0.6, 0.7,
 515  *                color-stop (0, &num;f00),
 516  *                color-stop (0.1, &num;a0f),
 517  *                color-stop (0.2, &commat;yellow),
 518  *                color-stop (1, &commat;green))</literallayout></para>
 519  * </example>
 520  * </refsect2>
 521  * <refsect2 id="gtkcssprovider-shadows">
 522  * <title>Text shadow</title>
 523  * <para>
 524  * A shadow list can be applied to text or symbolic icons, using the CSS3
 525  * text-shadow syntax, as defined in
 526  * <ulink url="http://www.w3.org/TR/css3-text/#text-shadow">the CSS3 specification</ulink>.
 527  * </para>
 528  * <para>
 529  * A text shadow is specified using the syntax
 530  * <literallayout>text-shadow: @horizontal_offset @vertical_offset [ @blur_radius ] @color</literallayout>
 531  * The offset of the shadow is specified with the @horizontal_offset and @vertical_offset
 532  * parameters. The optional blur radius is parsed, but it is currently not rendered by
 533  * the GTK+ theming engine.
 534  * </para>
 535  * <para>
 536  * To set multiple shadows on an element, you can specify a comma-separated list
 537  * of shadow elements in the text-shadow property. Shadows are always rendered
 538  * front-back, i.e. the first shadow specified is on top of the others. Shadows
 539  * can thus overlay each other, but they can never overlay the text itself,
 540  * which is always rendered on top of the shadow layer.
 541  * </para>
 542  * </refsect2>
 543  * <refsect2>
 544  * <title>Box shadow</title>
 545  * <para>
 546  * Themes can apply shadows on framed elements using the CSS3 box-shadow syntax,
 547  * as defined in
 548  * <ulink url="http://www.w3.org/TR/css3-background/#the-box-shadow">the CSS3 specification</ulink>.
 549  * </para>
 550  * <para>
 551  * A box shadow is specified using the syntax
 552  * <literallayout>box-shadow: [ @inset ] @horizontal_offset @vertical_offset [ @blur_radius ] [ @spread ] @color</literallayout>
 553  * A positive offset will draw a shadow that is offset to the right (down) of the box,
 554  * a negative offset to the left (top). The optional spread parameter defines an additional
 555  * distance to expand the shadow shape in all directions, by the specified radius.
 556  * The optional blur radius parameter is parsed, but it is currently not rendered by
 557  * the GTK+ theming engine.
 558  * The inset parameter defines whether the drop shadow should be rendered inside or outside
 559  * the box canvas. Only inset box-shadows are currently supported by the GTK+ theming engine,
 560  * non-inset elements are currently ignored.
 561  * </para>
 562  * <para>
 563  * To set multiple box-shadows on an element, you can specify a comma-separated list
 564  * of shadow elements in the box-shadow property. Shadows are always rendered
 565  * front-back, i.e. the first shadow specified is on top of the others, so they may
 566  * overlap other boxes or other shadows.
 567  * </para>
 568  * </refsect2>
 569  * <refsect2 id="gtkcssprovider-border-image">
 570  * <title>Border images</title>
 571  * <para>
 572  * Images and gradients can also be used in slices for the purpose of creating
 573  * scalable borders.
 574  * For more information, see the CSS3 documentation for the border-image property,
 575  * which can be found <ulink url="http://www.w3.org/TR/css3-background/#border-images">here</ulink>.
 576  * </para>
 577  * <inlinegraphic fileref="slices.png" format="PNG"/>
 578  * <para>
 579  * The parameters of the slicing process are controlled by
 580  * four separate properties. Note that you can use the
 581  * <literallayout>border-image</literallayout> shorthand property
 582  * to set values for the three properties at the same time.
 583  * </para>
 584  * <para>
 585  * <literallayout>border-image-source: url(@path)
 586  * (or border-image-source: -gtk-gradient(...))</literallayout>:
 587  * Specifies the source of the border image, and it can either
 588  * be an URL or a gradient (see above).
 589  * </para>
 590  * <para>
 591  * <literallayout>border-image-slice: @top @right @bottom @left</literallayout>
 592  * The sizes specified by the @top, @right, @bottom and @left parameters
 593  * are the offsets, in pixels, from the relevant edge where the image
 594  * should be "cut off" to build the slices used for the rendering
 595  * of the border.
 596  * </para>
 597  * <para>
 598  * <literallayout>border-image-width: @top @right @bottom @left</literallayout>
 599  * The sizes specified by the @top, @right, @bottom and @left parameters
 600  * are inward distances from the border box edge, used to specify the
 601  * rendered size of each slice determined by border-image-slice.
 602  * If this property is not specified, the values of border-width will
 603  * be used as a fallback.
 604  * </para>
 605  * <para>
 606  * <literallayout>border-image-repeat: [stretch|repeat|round|space] ?
 607  * [stretch|repeat|round|space]</literallayout>
 608  * Specifies how the image slices should be rendered in the area
 609  * outlined by border-width.
 610  * The default (stretch) is to resize the slice to fill in the whole
 611  * allocated area.
 612  * If the value of this property is 'repeat', the image slice
 613  * will be tiled to fill the area.
 614  * If the value of this property is 'round', the image slice will
 615  * be tiled to fill the area, and scaled to fit it exactly
 616  * a whole number of times.
 617  * If the value of this property is 'space', the image slice will
 618  * be tiled to fill the area, and if it doesn't fit it exactly a whole
 619  * number of times, the extra space is distributed as padding around
 620  * the slices.
 621  * If two options are specified, the first one affects
 622  * the horizontal behaviour and the second one the vertical behaviour.
 623  * If only one option is specified, it affects both.
 624  * </para>
 625  * <example>
 626  * <title>A border image</title>
 627  * <inlinegraphic fileref="border1.png" format="PNG"/>
 628  * <para>This border image was specified with
 629  * <literallayout>url("gradient1.png") 10 10 10 10</literallayout>
 630  * </para>
 631  * </example>
 632  * <example>
 633  * <title>A repeating border image</title>
 634  * <inlinegraphic fileref="border2.png" format="PNG"/>
 635  * <para>This border image was specified with
 636  * <literallayout>url("gradient1.png") 10 10 10 10 repeat</literallayout>
 637  * </para>
 638  * </example>
 639  * <example>
 640  * <title>A stretched border image</title>
 641  * <inlinegraphic fileref="border3.png" format="PNG"/>
 642  * <para>This border image was specified with
 643  * <literallayout>url("gradient1.png") 10 10 10 10 stretch</literallayout>
 644  * </para>
 645  * </example>
 646  * </refsect2>
 647  * <refsect2 id="gtkcssprovider-transitions">
 648  * <para>Styles can specify transitions that will be used to create a gradual
 649  * change in the appearance when a widget state changes. The following
 650  * syntax is used to specify transitions:
 651  * <literallayout>@duration [s|ms] [linear|ease|ease-in|ease-out|ease-in-out] [loop]?</literallayout>
 652  * The @duration is the amount of time that the animation will take for
 653  * a complete cycle from start to end. If the loop option is given, the
 654  * animation will be repated until the state changes again.
 655  * The option after the duration determines the transition function from a
 656  * small set of predefined functions.
 657  * <figure><title>Linear transition</title>
 658  * <graphic fileref="linear.png" format="PNG"/>
 659  * </figure>
 660  * <figure><title>Ease transition</title>
 661  * <graphic fileref="ease.png" format="PNG"/>
 662  * </figure>
 663  * <figure><title>Ease-in-out transition</title>
 664  * <graphic fileref="ease-in-out.png" format="PNG"/>
 665  * </figure>
 666  * <figure><title>Ease-in transition</title>
 667  * <graphic fileref="ease-in.png" format="PNG"/>
 668  * </figure>
 669  * <figure><title>Ease-out transition</title>
 670  * <graphic fileref="ease-out.png" format="PNG"/>
 671  * </figure>
 672  * </para>
 673  * </refsect2>
 674  * <refsect2 id="gtkcssprovider-properties">
 675  * <title>Supported properties</title>
 676  * <para>
 677  * Properties are the part that differ the most to common CSS,
 678  * not all properties are supported (some are planned to be
 679  * supported eventually, some others are meaningless or don't
 680  * map intuitively in a widget based environment).
 681  * </para>
 682  * <para>
 683  * The currently supported properties are:
 684  * </para>
 685  * <informaltable>
 686  *   <tgroup cols="4">
 687  *     <thead>
 688  *       <row>
 689  *         <entry>Property name</entry>
 690  *         <entry>Syntax</entry>
 691  *         <entry>Maps to</entry>
 692  *         <entry>Examples</entry>
 693  *       </row>
 694  *     </thead>
 695  *     <tbody>
 696  *       <row>
 697  *         <entry>engine</entry>
 698  *         <entry>engine-name</entry>
 699  *         <entry>#GtkThemingEngine</entry>
 700  *         <entry>engine: clearlooks;
 701  *  engine: none; /&ast; use the default (i.e. builtin) engine) &ast;/ </entry>
 702  *       </row>
 703  *       <row>
 704  *         <entry>background-color</entry>
 705  *         <entry morerows="2">color (see above)</entry>
 706  *         <entry morerows="7">#GdkRGBA</entry>
 707  *         <entry morerows="7"><literallayout>background-color: &num;fff;
 708  * color: &amp;color1;
 709  * background-color: shade (&amp;color1, 0.5);
 710  * color: mix (&amp;color1, &num;f0f, 0.8);</literallayout>
 711  *         </entry>
 712  *       </row>
 713  *       <row>
 714  *         <entry>color</entry>
 715  *       </row>
 716  *       <row>
 717  *         <entry>border-top-color</entry>
 718  *         <entry morerows="4">transparent|color (see above)</entry>
 719  *       </row>
 720  *       <row>
 721  *         <entry>border-right-color</entry>
 722  *       </row>
 723  *       <row>
 724  *         <entry>border-bottom-color</entry>
 725  *       </row>
 726  *       <row>
 727  *         <entry>border-left-color</entry>
 728  *       </row>
 729  *       <row>
 730  *         <entry>border-color</entry>
 731  *         <entry>[transparent|color]{1,4}</entry>
 732  *       </row>
 733  *       <row>
 734  *         <entry>font-family</entry>
 735  *         <entry>@family [, @family]*</entry>
 736  *         <entry>#gchararray</entry>
 737  *         <entry>font-family: Sans, Arial;</entry>
 738  *       </row>
 739  *       <row>
 740  *         <entry>font-style</entry>
 741  *         <entry>[normal|oblique|italic]</entry>
 742  *         <entry>#PANGO_TYPE_STYLE</entry>
 743  *         <entry>font-style: italic;</entry>
 744  *       </row>
 745  *       <row>
 746  *         <entry>font-variant</entry>
 747  *         <entry>[normal|small-caps]</entry>
 748  *         <entry>#PANGO_TYPE_VARIANT</entry>
 749  *         <entry>font-variant: normal;</entry>
 750  *       </row>
 751  *       <row>
 752  *         <entry>font-weight</entry>
 753  *         <entry>[normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900]</entry>
 754  *         <entry>#PANGO_TYPE_WEIGHT</entry>
 755  *         <entry>font-weight: bold;</entry>
 756  *       </row>
 757  *       <row>
 758  *         <entry>font-size</entry>
 759  *         <entry>Font size in point</entry>
 760  *         <entry>#gint</entry>
 761  *         <entry>font-size: 13;</entry>
 762  *       </row>
 763  *       <row>
 764  *         <entry>font</entry>
 765  *         <entry>@family [@style] [@size]</entry>
 766  *         <entry>#PangoFontDescription</entry>
 767  *         <entry>font: Sans 15;</entry>
 768  *       </row>
 769  *       <row>
 770  *         <entry>margin-top</entry>
 771  *         <entry>integer</entry>
 772  *         <entry>#gint</entry>
 773  *         <entry>margin-top: 0;</entry>
 774  *       </row>
 775  *       <row>
 776  *         <entry>margin-left</entry>
 777  *         <entry>integer</entry>
 778  *         <entry>#gint</entry>
 779  *         <entry>margin-left: 1;</entry>
 780  *       </row>
 781  *       <row>
 782  *         <entry>margin-bottom</entry>
 783  *         <entry>integer</entry>
 784  *         <entry>#gint</entry>
 785  *         <entry>margin-bottom: 2;</entry>
 786  *       </row>
 787  *       <row>
 788  *         <entry>margin-right</entry>
 789  *         <entry>integer</entry>
 790  *         <entry>#gint</entry>
 791  *         <entry>margin-right: 4;</entry>
 792  *       </row>
 793  *       <row>
 794  *         <entry>margin</entry>
 795  *         <entry morerows="1"><literallayout>@width
 796  * @vertical_width @horizontal_width
 797  * @top_width @horizontal_width @bottom_width
 798  * @top_width @right_width @bottom_width @left_width</literallayout>
 799  *         </entry>
 800  *         <entry morerows="1">#GtkBorder</entry>
 801  *         <entry morerows="1"><literallayout>margin: 5;
 802  * margin: 5 10;
 803  * margin: 5 10 3;
 804  * margin: 5 10 3 5;</literallayout>
 805  *         </entry>
 806  *       </row>
 807  *       <row>
 808  *         <entry>padding-top</entry>
 809  *         <entry>integer</entry>
 810  *         <entry>#gint</entry>
 811  *         <entry>padding-top: 5;</entry>
 812  *       </row>
 813  *       <row>
 814  *         <entry>padding-left</entry>
 815  *         <entry>integer</entry>
 816  *         <entry>#gint</entry>
 817  *         <entry>padding-left: 5;</entry>
 818  *       </row>
 819  *       <row>
 820  *         <entry>padding-bottom</entry>
 821  *         <entry>integer</entry>
 822  *         <entry>#gint</entry>
 823  *         <entry>padding-bottom: 5;</entry>
 824  *       </row>
 825  *       <row>
 826  *         <entry>padding-right</entry>
 827  *         <entry>integer</entry>
 828  *         <entry>#gint</entry>
 829  *         <entry>padding-right: 5;</entry>
 830  *       </row>
 831  *       <row>
 832  *         <entry>padding</entry>
 833  *       </row>
 834  *       <row>
 835  *         <entry>background-image</entry>
 836  *         <entry><literallayout>gradient (see above) or
 837  * url(@path)</literallayout></entry>
 838  *         <entry>#cairo_pattern_t</entry>
 839  *         <entry><literallayout>-gtk-gradient (linear,
 840  *                left top, right top,
 841  *                from (&num;fff), to (&num;000));
 842  * -gtk-gradient (linear, 0.0 0.5, 0.5 1.0,
 843  *                from (&num;fff),
 844  *                color-stop (0.5, &num;f00),
 845  *                to (&num;000));
 846  * -gtk-gradient (radial,
 847  *                center center, 0.2,
 848  *                center center, 0.8,
 849  *                color-stop (0.0, &num;fff),
 850  *                color-stop (1.0, &num;000));
 851  * url ('background.png');</literallayout>
 852  *         </entry>
 853  *       </row>
 854  *       <row>
 855  *         <entry>background-repeat</entry>
 856  *         <entry>[repeat|no-repeat]</entry>
 857  *         <entry>internal</entry>
 858  *         <entry><literallayout>background-repeat: no-repeat;</literallayout>
 859  *                If not specified, the style doesn't respect the CSS3
 860  *                specification, since the background will be
 861  *                stretched to fill the area.
 862  *         </entry>
 863  *       </row>
 864  *       <row>
 865  *         <entry>border-top-width</entry>
 866  *         <entry>integer</entry>
 867  *         <entry>#gint</entry>
 868  *         <entry>border-top-width: 5;</entry>
 869  *       </row>
 870  *       <row>
 871  *         <entry>border-left-width</entry>
 872  *         <entry>integer</entry>
 873  *         <entry>#gint</entry>
 874  *         <entry>border-left-width: 5;</entry>
 875  *       </row>
 876  *       <row>
 877  *         <entry>border-bottom-width</entry>
 878  *         <entry>integer</entry>
 879  *         <entry>#gint</entry>
 880  *         <entry>border-bottom-width: 5;</entry>
 881  *       </row>
 882  *       <row>
 883  *         <entry>border-right-width</entry>
 884  *         <entry>integer</entry>
 885  *         <entry>#gint</entry>
 886  *         <entry>border-right-width: 5;</entry>
 887  *       </row>
 888  *       <row>
 889  *         <entry>border-width</entry>
 890  *         <entry morerows="1">#GtkBorder</entry>
 891  *         <entry morerows="1"><literallayout>border-width: 1;
 892  * border-width: 1 2;
 893  * border-width: 1 2 3;
 894  * border-width: 1 2 3 5;</literallayout>
 895  *         </entry>
 896  *       </row>
 897  *       <row>
 898  *         <entry>border-radius</entry>
 899  *         <entry>integer</entry>
 900  *         <entry>#gint</entry>
 901  *         <entry>border-radius: 5;</entry>
 902  *       </row>
 903  *       <row>
 904  *         <entry>border-style</entry>
 905  *         <entry>[none|solid|inset|outset]</entry>
 906  *         <entry>#GtkBorderStyle</entry>
 907  *         <entry>border-style: solid;</entry>
 908  *       </row>
 909  *       <row>
 910  *         <entry>border-image</entry>
 911  *         <entry><literallayout>border image (see above)</literallayout></entry>
 912  *         <entry>internal use only</entry>
 913  *         <entry><literallayout>border-image: url("/path/to/image.png") 3 4 3 4 stretch;
 914  * border-image: url("/path/to/image.png") 3 4 4 3 repeat stretch;</literallayout>
 915  *         </entry>
 916  *       </row>
 917  *       <row>
 918  *         <entry>text-shadow</entry>
 919  *         <entry>shadow list (see above)</entry>
 920  *         <entry>internal use only</entry>
 921  *         <entry><literallayout>text-shadow: 1 1 0 blue, -4 -4 red;</literallayout></entry>
 922  *       </row>
 923  *       <row>
 924  *         <entry>transition</entry>
 925  *         <entry>transition (see above)</entry>
 926  *         <entry>internal use only</entry>
 927  *         <entry><literallayout>transition: 150ms ease-in-out;
 928  * transition: 1s linear loop;</literallayout>
 929  *         </entry>
 930  *       </row>
 931  *       <row>
 932  *         <entry>gtk-key-bindings</entry>
 933  *         <entry>binding set name list</entry>
 934  *         <entry>internal use only</entry>
 935  *         <entry><literallayout>gtk-bindings: binding1, binding2, ...;</literallayout>
 936  *         </entry>
 937  *       </row>
 938  *     </tbody>
 939  *   </tgroup>
 940  * </informaltable>
 941  * <para>
 942  * GtkThemingEngines can register their own, engine-specific style properties
 943  * with the function gtk_theming_engine_register_property(). These properties
 944  * can be set in CSS like other properties, using a name of the form
 945  * <literallayout>-<replaceable>namespace</replaceable>-<replaceable>name</replaceable></literallayout>, where <replaceable>namespace</replaceable> is typically
 946  * the name of the theming engine, and <replaceable>name</replaceable> is the
 947  * name of the property. Style properties that have been registered by widgets
 948  * using gtk_widget_class_install_style_property() can also be set in this
 949  * way, using the widget class name for <replaceable>namespace</replaceable>.
 950  * </para>
 951  * <example>
 952  * <title>Using engine-specific style properties</title>
 953  * <programlisting>
 954  * * {
 955  *     engine: clearlooks;
 956  *     border-radius: 4;
 957  *     -GtkPaned-handle-size: 6;
 958  *     -clearlooks-colorize-scrollbar: false;
 959  * }
 960  * </programlisting>
 961  * </example>
 962  * </refsect2>
 963  */
 964
 965 typedef struct GtkCssRuleset GtkCssRuleset;
 966 typedef struct _GtkCssScanner GtkCssScanner;
 967 typedef struct _PropertyValue PropertyValue;
 968 typedef struct _WidgetPropertyValue WidgetPropertyValue;
 969 typedef enum ParserScope ParserScope;
 970 typedef enum ParserSymbol ParserSymbol;
 971
 972 struct _PropertyValue {
 973   GtkCssStyleProperty *property;
 974   GtkCssValue         *value;
 975   GtkCssSection       *section;
 976 };
 977
 978 struct _WidgetPropertyValue {
 979   WidgetPropertyValue *next;
 980   char *name;
 981   char *value;
 982
 983   GtkCssSection *section;
 984 };
 985
 986 struct GtkCssRuleset
 987 {
 988   GtkCssSelector *selector;
 989   WidgetPropertyValue *widget_style;
 990   PropertyValue *styles;
 991   GtkBitmask *set_styles;
 992   guint n_styles;
 993   guint owns_styles : 1;
 994   guint owns_widget_style : 1;
 995 };
 996
 997 struct _GtkCssScanner
 998 {
 999   GtkCssProvider *provider;
1000   GtkCssParser *parser;
1001   GtkCssSection *section;
1002   GtkCssScanner *parent;
1003   GSList *state;
1004 };
1005
1006 struct _GtkCssProviderPrivate
1007 {
1008   GScanner *scanner;
1009
1010   GHashTable *symbolic_colors;
1011   GHashTable *keyframes;
1012
1013   GArray *rulesets;
1014   GResource *resource;
1015 };
1016
1017 enum {
1018   PARSING_ERROR,
1019   LAST_SIGNAL
1020 };
1021
1022 static gboolean gtk_keep_css_sections = FALSE;
1023
1024 static guint css_provider_signals[LAST_SIGNAL] = { 0 };
1025
1026 static void gtk_css_provider_finalize (GObject *object);
1027 static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
1028 static void gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface);
1029 static void widget_property_value_list_free (WidgetPropertyValue *head);
1030
1031 static gboolean
1032 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
1033                                 GtkCssScanner  *scanner,
1034                                 GFile          *file,
1035                                 const char     *data,
1036                                 GError        **error);
1037
1038 GQuark
1039 gtk_css_provider_error_quark (void)
1040 {
1041   return g_quark_from_static_string ("gtk-css-provider-error-quark");
1042 }
1043
1044 G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
1045                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
1046                                                gtk_css_style_provider_iface_init)
1047                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER_PRIVATE,
1048                                                gtk_css_style_provider_private_iface_init));
1049
1050 static void
1051 gtk_css_provider_parsing_error (GtkCssProvider  *provider,
1052                                 GtkCssSection   *section,
1053                                 const GError    *error)
1054 {
1055   /* Only emit a warning when we have no error handlers. This is our
1056    * default handlers. And in this case erroneous CSS files are a bug
1057    * and should be fixed.
1058    * Note that these warnings can also be triggered by a broken theme
1059    * that people installed from some weird location on the internets.
1060    */
1061   if (!g_signal_has_handler_pending (provider,
1062                                      css_provider_signals[PARSING_ERROR],
1063                                      0,
1064                                      TRUE))
1065     {
1066       GFileInfo *info;
1067       GFile *file;
1068       const char *path;
1069
1070       file = gtk_css_section_get_file (section);
1071       if (file)
1072         {
1073           info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1074
1075           if (info)
1076             path = g_file_info_get_display_name (info);
1077           else
1078             path = "<broken file>";
1079         }
1080       else
1081         {
1082           info = NULL;
1083           path = "<data>";
1084         }
1085
1086       g_warning ("Theme parsing error: %s:%u:%u: %s",
1087                  path,
1088                  gtk_css_section_get_end_line (section) + 1,
1089                  gtk_css_section_get_end_position (section),
1090                  error->message);
1091
1092       if (info)
1093         g_object_unref (info);
1094     }
1095 }
1096
1097 static void
1098 gtk_css_provider_class_init (GtkCssProviderClass *klass)
1099 {
1100   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1101
1102   if (g_getenv ("GTK_CSS_DEBUG"))
1103     gtk_keep_css_sections = TRUE;
1104
1105   /**
1106    * GtkCssProvider::parsing-error:
1107    * @provider: the provider that had a parsing error
1108    * @section: section the error happened in
1109    * @error: The parsing error
1110    *
1111    * Signals that a parsing error occured. the @path, @line and @position
1112    * describe the actual location of the error as accurately as possible.
1113    *
1114    * Parsing errors are never fatal, so the parsing will resume after
1115    * the error. Errors may however cause parts of the given
1116    * data or even all of it to not be parsed at all. So it is a useful idea
1117    * to check that the parsing succeeds by connecting to this signal.
1118    *
1119    * Note that this signal may be emitted at any time as the css provider
1120    * may opt to defer parsing parts or all of the input to a later time
1121    * than when a loading function was called.
1122    */
1123   css_provider_signals[PARSING_ERROR] =
1124     g_signal_new (I_("parsing-error"),
1125                   G_TYPE_FROM_CLASS (object_class),
1126                   G_SIGNAL_RUN_LAST,
1127                   G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
1128                   NULL, NULL,
1129                   _gtk_marshal_VOID__BOXED_BOXED,
1130                   G_TYPE_NONE, 2, GTK_TYPE_CSS_SECTION, G_TYPE_ERROR);
1131
1132   object_class->finalize = gtk_css_provider_finalize;
1133
1134   klass->parsing_error = gtk_css_provider_parsing_error;
1135
1136   g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
1137 }
1138
1139 static void
1140 gtk_css_ruleset_init_copy (GtkCssRuleset       *new,
1141                            GtkCssRuleset       *ruleset,
1142                            GtkCssSelector      *selector)
1143 {
1144   memcpy (new, ruleset, sizeof (GtkCssRuleset));
1145
1146   new->selector = selector;
1147   /* First copy takes over ownership */
1148   if (ruleset->owns_styles)
1149     ruleset->owns_styles = FALSE;
1150   if (ruleset->owns_widget_style)
1151     ruleset->owns_widget_style = FALSE;
1152   if (new->set_styles)
1153     new->set_styles = _gtk_bitmask_copy (new->set_styles);
1154 }
1155
1156 static void
1157 gtk_css_ruleset_clear (GtkCssRuleset *ruleset)
1158 {
1159   if (ruleset->owns_styles)
1160     {
1161       guint i;
1162
1163       for (i = 0; i < ruleset->n_styles; i++)
1164         {
1165           _gtk_css_value_unref (ruleset->styles[i].value);
1166           ruleset->styles[i].value = NULL;
1167           if (ruleset->styles[i].section)
1168             gtk_css_section_unref (ruleset->styles[i].section);
1169         }
1170       g_free (ruleset->styles);
1171     }
1172   if (ruleset->set_styles)
1173     _gtk_bitmask_free (ruleset->set_styles);
1174   if (ruleset->owns_widget_style)
1175     widget_property_value_list_free (ruleset->widget_style);
1176   if (ruleset->selector)
1177     _gtk_css_selector_free (ruleset->selector);
1178
1179   memset (ruleset, 0, sizeof (GtkCssRuleset));
1180 }
1181
1182 static WidgetPropertyValue *
1183 widget_property_value_new (char *name, GtkCssSection *section)
1184 {
1185   WidgetPropertyValue *value;
1186
1187   value = g_slice_new0 (WidgetPropertyValue);
1188
1189   value->name = name;
1190   if (gtk_keep_css_sections)
1191     value->section = gtk_css_section_ref (section);
1192
1193   return value;
1194 }
1195
1196 static void
1197 widget_property_value_free (WidgetPropertyValue *value)
1198 {
1199   g_free (value->value);
1200   g_free (value->name);
1201   if (value->section)
1202     gtk_css_section_unref (value->section);
1203
1204   g_slice_free (WidgetPropertyValue, value);
1205 }
1206
1207 static void
1208 widget_property_value_list_free (WidgetPropertyValue *head)
1209 {
1210   WidgetPropertyValue *l, *next;
1211   for (l = head; l != NULL; l = next)
1212     {
1213       next = l->next;
1214       widget_property_value_free (l);
1215     }
1216 }
1217
1218 static WidgetPropertyValue *
1219 widget_property_value_list_remove_name (WidgetPropertyValue *head, const char *name)
1220 {
1221   WidgetPropertyValue *l, **last;
1222
1223   last = &head;
1224
1225   for (l = head; l != NULL; l = l->next)
1226     {
1227       if (strcmp (l->name, name) == 0)
1228         {
1229           *last = l->next;
1230           widget_property_value_free (l);
1231           break;
1232         }
1233
1234       last = &l->next;
1235     }
1236
1237   return head;
1238 }
1239
1240 static void
1241 gtk_css_ruleset_add_style (GtkCssRuleset *ruleset,
1242                            char          *name,
1243                            WidgetPropertyValue *value)
1244 {
1245   value->next = widget_property_value_list_remove_name (ruleset->widget_style, name);
1246   ruleset->widget_style = value;
1247   ruleset->owns_widget_style = TRUE;
1248 }
1249
1250 static void
1251 gtk_css_ruleset_add (GtkCssRuleset       *ruleset,
1252                      GtkCssStyleProperty *property,
1253                      GtkCssValue         *value,
1254                      GtkCssSection       *section)
1255 {
1256   guint i;
1257
1258   g_return_if_fail (ruleset->owns_styles || ruleset->n_styles == 0);
1259
1260   if (ruleset->set_styles == NULL)
1261     ruleset->set_styles = _gtk_bitmask_new ();
1262
1263   ruleset->set_styles = _gtk_bitmask_set (ruleset->set_styles,
1264                                           _gtk_css_style_property_get_id (property),
1265                                           TRUE);
1266
1267   ruleset->owns_styles = TRUE;
1268
1269   for (i = 0; i < ruleset->n_styles; i++)
1270     {
1271       if (ruleset->styles[i].property == property)
1272         {
1273           _gtk_css_value_unref (ruleset->styles[i].value);
1274           ruleset->styles[i].value = NULL;
1275           if (ruleset->styles[i].section)
1276             gtk_css_section_unref (ruleset->styles[i].section);
1277           break;
1278         }
1279     }
1280   if (i == ruleset->n_styles)
1281     {
1282       ruleset->n_styles++;
1283       ruleset->styles = g_realloc (ruleset->styles, ruleset->n_styles * sizeof (PropertyValue));
1284       ruleset->styles[i].value = NULL;
1285       ruleset->styles[i].property = property;
1286     }
1287
1288   ruleset->styles[i].value = value;
1289   if (gtk_keep_css_sections)
1290     ruleset->styles[i].section = gtk_css_section_ref (section);
1291   else
1292     ruleset->styles[i].section = NULL;
1293 }
1294
1295 static gboolean
1296 gtk_css_ruleset_matches (GtkCssRuleset       *ruleset,
1297                          const GtkCssMatcher *matcher)
1298 {
1299   return _gtk_css_selector_matches (ruleset->selector, matcher);
1300 }
1301
1302 static GtkCssChange
1303 gtk_css_ruleset_get_change (GtkCssRuleset *ruleset)
1304 {
1305   return _gtk_css_selector_get_change (ruleset->selector);
1306 }
1307
1308 static void
1309 gtk_css_scanner_destroy (GtkCssScanner *scanner)
1310 {
1311   if (scanner->section)
1312     gtk_css_section_unref (scanner->section);
1313   g_object_unref (scanner->provider);
1314   _gtk_css_parser_free (scanner->parser);
1315
1316   g_slice_free (GtkCssScanner, scanner);
1317 }
1318
1319 static void
1320 gtk_css_provider_emit_error (GtkCssProvider *provider,
1321                              GtkCssScanner  *scanner,
1322                              const GError   *error)
1323 {
1324   g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
1325                  scanner != NULL ? scanner->section : NULL, error);
1326 }
1327
1328 static void
1329 gtk_css_scanner_parser_error (GtkCssParser *parser,
1330                               const GError *error,
1331                               gpointer      user_data)
1332 {
1333   GtkCssScanner *scanner = user_data;
1334
1335   gtk_css_provider_emit_error (scanner->provider,
1336                                scanner,
1337                                error);
1338 }
1339
1340 static GtkCssScanner *
1341 gtk_css_scanner_new (GtkCssProvider *provider,
1342                      GtkCssScanner  *parent,
1343                      GtkCssSection  *section,
1344                      GFile          *file,
1345                      const gchar    *text)
1346 {
1347   GtkCssScanner *scanner;
1348
1349   scanner = g_slice_new0 (GtkCssScanner);
1350
1351   g_object_ref (provider);
1352   scanner->provider = provider;
1353   scanner->parent = parent;
1354   if (section)
1355     scanner->section = gtk_css_section_ref (section);
1356
1357   scanner->parser = _gtk_css_parser_new (text,
1358                                          file,
1359                                          gtk_css_scanner_parser_error,
1360                                          scanner);
1361
1362   return scanner;
1363 }
1364
1365 static gboolean
1366 gtk_css_scanner_would_recurse (GtkCssScanner *scanner,
1367                                GFile         *file)
1368 {
1369   while (scanner)
1370     {
1371       GFile *parser_file = _gtk_css_parser_get_file (scanner->parser);
1372       if (parser_file && g_file_equal (parser_file, file))
1373         return TRUE;
1374
1375       scanner = scanner->parent;
1376     }
1377
1378   return FALSE;
1379 }
1380
1381 static void
1382 gtk_css_scanner_push_section (GtkCssScanner     *scanner,
1383                               GtkCssSectionType  section_type)
1384 {
1385   GtkCssSection *section;
1386
1387   section = _gtk_css_section_new (scanner->section,
1388                                   section_type,
1389                                   scanner->parser);
1390
1391   if (scanner->section)
1392     gtk_css_section_unref (scanner->section);
1393   scanner->section = section;
1394 }
1395
1396 static void
1397 gtk_css_scanner_pop_section (GtkCssScanner *scanner,
1398                              GtkCssSectionType check_type)
1399 {
1400   GtkCssSection *parent;
1401
1402   g_assert (gtk_css_section_get_section_type (scanner->section) == check_type);
1403
1404   parent = gtk_css_section_get_parent (scanner->section);
1405   if (parent)
1406     gtk_css_section_ref (parent);
1407
1408   _gtk_css_section_end (scanner->section);
1409   gtk_css_section_unref (scanner->section);
1410
1411   scanner->section = parent;
1412 }
1413
1414 static void
1415 gtk_css_provider_init (GtkCssProvider *css_provider)
1416 {
1417   GtkCssProviderPrivate *priv;
1418
1419   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1420                                                            GTK_TYPE_CSS_PROVIDER,
1421                                                            GtkCssProviderPrivate);
1422
1423   priv->rulesets = g_array_new (FALSE, FALSE, sizeof (GtkCssRuleset));
1424
1425   priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
1426                                                  (GDestroyNotify) g_free,
1427                                                  (GDestroyNotify) gtk_symbolic_color_unref);
1428   priv->keyframes = g_hash_table_new_full (g_str_hash, g_str_equal,
1429                                            (GDestroyNotify) g_free,
1430                                            (GDestroyNotify) _gtk_css_value_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   GtkCssMatcher matcher;
1461   GtkCssProvider *css_provider;
1462   GtkCssProviderPrivate *priv;
1463   GtkStyleProperties *props;
1464   guint i, j;
1465
1466   css_provider = GTK_CSS_PROVIDER (provider);
1467   priv = css_provider->priv;
1468   props = gtk_style_properties_new ();
1469
1470   css_provider_dump_symbolic_colors (css_provider, props);
1471   if (_gtk_css_matcher_init (&matcher, path, 0))
1472     {
1473       for (i = 0; i < priv->rulesets->len; i++)
1474         {
1475           GtkCssRuleset *ruleset;
1476
1477           ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1478
1479           if (ruleset->styles == NULL)
1480             continue;
1481
1482           if (!gtk_css_ruleset_matches (ruleset, &matcher))
1483             continue;
1484
1485           for (j = 0; j < ruleset->n_styles; j++)
1486             _gtk_style_properties_set_property_by_property (props,
1487                                                             GTK_CSS_STYLE_PROPERTY (ruleset->styles[i].property),
1488                                                             _gtk_css_selector_get_state_flags (ruleset->selector),
1489                                                             ruleset->styles[i].value);
1490         }
1491     }
1492
1493   return props;
1494 }
1495
1496 static gboolean
1497 gtk_css_provider_get_style_property (GtkStyleProvider *provider,
1498                                      GtkWidgetPath    *path,
1499                                      GtkStateFlags     state,
1500                                      GParamSpec       *pspec,
1501                                      GValue           *value)
1502 {
1503   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1504   GtkCssProviderPrivate *priv = css_provider->priv;
1505   WidgetPropertyValue *val;
1506   GtkCssMatcher matcher;
1507   gboolean found = FALSE;
1508   gchar *prop_name;
1509   gint i;
1510
1511   if (!_gtk_css_matcher_init (&matcher, path, state))
1512     return FALSE;
1513
1514   prop_name = g_strdup_printf ("-%s-%s",
1515                                g_type_name (pspec->owner_type),
1516                                pspec->name);
1517
1518   for (i = priv->rulesets->len - 1; i >= 0; i--)
1519     {
1520       GtkCssRuleset *ruleset;
1521
1522       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1523
1524       if (ruleset->widget_style == NULL)
1525         continue;
1526
1527       if (!gtk_css_ruleset_matches (ruleset, &matcher))
1528         continue;
1529
1530       for (val = ruleset->widget_style; val != NULL; val = val->next)
1531         {
1532           if (strcmp (val->name, prop_name) == 0)
1533             {
1534               GtkCssScanner *scanner;
1535
1536               scanner = gtk_css_scanner_new (css_provider,
1537                                              NULL,
1538                                              val->section,
1539                                              val->section != NULL ? gtk_css_section_get_file (val->section) : NULL,
1540                                              val->value);
1541
1542               found = _gtk_css_style_parse_value (value,
1543                                                   scanner->parser);
1544
1545               gtk_css_scanner_destroy (scanner);
1546
1547               break;
1548             }
1549         }
1550
1551       if (found)
1552         break;
1553     }
1554
1555   g_free (prop_name);
1556
1557   return found;
1558 }
1559
1560 static void
1561 gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
1562 {
1563   iface->get_style = gtk_css_provider_get_style;
1564   iface->get_style_property = gtk_css_provider_get_style_property;
1565 }
1566
1567 static GtkSymbolicColor *
1568 gtk_css_style_provider_get_color (GtkStyleProviderPrivate *provider,
1569                                   const char              *name)
1570 {
1571   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1572
1573   return g_hash_table_lookup (css_provider->priv->symbolic_colors, name);
1574 }
1575
1576 static void
1577 gtk_css_style_provider_lookup (GtkStyleProviderPrivate *provider,
1578                                const GtkCssMatcher     *matcher,
1579                                GtkCssLookup            *lookup)
1580 {
1581   GtkCssProvider *css_provider;
1582   GtkCssProviderPrivate *priv;
1583   int i;
1584   guint j;
1585
1586   css_provider = GTK_CSS_PROVIDER (provider);
1587   priv = css_provider->priv;
1588
1589   for (i = priv->rulesets->len - 1; i >= 0; i--)
1590     {
1591       GtkCssRuleset *ruleset;
1592
1593       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1594
1595       if (ruleset->styles == NULL)
1596         continue;
1597
1598       if (!_gtk_bitmask_intersects (_gtk_css_lookup_get_missing (lookup),
1599                                     ruleset->set_styles))
1600         continue;
1601
1602       if (!gtk_css_ruleset_matches (ruleset, matcher))
1603         continue;
1604
1605       for (j = 0; j < ruleset->n_styles; j++)
1606         {
1607           GtkCssStyleProperty *prop = ruleset->styles[j].property;
1608           guint id = _gtk_css_style_property_get_id (prop);
1609
1610           if (!_gtk_css_lookup_is_missing (lookup, id))
1611             continue;
1612
1613           _gtk_css_lookup_set (lookup,
1614                                id,
1615                                ruleset->styles[j].section,
1616                                ruleset->styles[j].value);
1617         }
1618     }
1619 }
1620
1621 static GtkCssChange
1622 gtk_css_style_provider_get_change (GtkStyleProviderPrivate *provider,
1623                                    const GtkCssMatcher     *matcher)
1624 {
1625   GtkCssProvider *css_provider;
1626   GtkCssProviderPrivate *priv;
1627   GtkCssChange change = 0;
1628   int i;
1629
1630   css_provider = GTK_CSS_PROVIDER (provider);
1631   priv = css_provider->priv;
1632
1633   for (i = priv->rulesets->len - 1; i >= 0; i--)
1634     {
1635       GtkCssRuleset *ruleset;
1636
1637       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1638
1639       if (ruleset->styles == NULL)
1640         continue;
1641
1642       if (!gtk_css_ruleset_matches (ruleset, matcher))
1643         continue;
1644
1645       change |= gtk_css_ruleset_get_change (ruleset);
1646     }
1647
1648   return change;
1649 }
1650
1651 static void
1652 gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface)
1653 {
1654   iface->get_color = gtk_css_style_provider_get_color;
1655   iface->lookup = gtk_css_style_provider_lookup;
1656   iface->get_change = gtk_css_style_provider_get_change;
1657 }
1658
1659 static void
1660 gtk_css_provider_finalize (GObject *object)
1661 {
1662   GtkCssProvider *css_provider;
1663   GtkCssProviderPrivate *priv;
1664   guint i;
1665
1666   css_provider = GTK_CSS_PROVIDER (object);
1667   priv = css_provider->priv;
1668
1669   for (i = 0; i < priv->rulesets->len; i++)
1670     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1671
1672   g_array_free (priv->rulesets, TRUE);
1673
1674   g_hash_table_destroy (priv->symbolic_colors);
1675   g_hash_table_destroy (priv->keyframes);
1676
1677   if (priv->resource)
1678     {
1679       g_resources_unregister (priv->resource);
1680       g_resource_unref (priv->resource);
1681       priv->resource = NULL;
1682     }
1683
1684   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1685 }
1686
1687 /**
1688  * gtk_css_provider_new:
1689  *
1690  * Returns a newly created #GtkCssProvider.
1691  *
1692  * Returns: A new #GtkCssProvider
1693  **/
1694 GtkCssProvider *
1695 gtk_css_provider_new (void)
1696 {
1697   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1698 }
1699
1700 static void
1701 gtk_css_provider_take_error (GtkCssProvider *provider,
1702                              GtkCssScanner  *scanner,
1703                              GError         *error)
1704 {
1705   gtk_css_provider_emit_error (provider,
1706                                scanner,
1707                                error);
1708
1709   g_error_free (error);
1710 }
1711
1712 static void
1713 gtk_css_provider_error_literal (GtkCssProvider *provider,
1714                                 GtkCssScanner  *scanner,
1715                                 GQuark          domain,
1716                                 gint            code,
1717                                 const char     *message)
1718 {
1719   gtk_css_provider_take_error (provider,
1720                                scanner,
1721                                g_error_new_literal (domain, code, message));
1722 }
1723
1724 static void
1725 gtk_css_provider_error (GtkCssProvider *provider,
1726                         GtkCssScanner  *scanner,
1727                         GQuark          domain,
1728                         gint            code,
1729                         const char     *format,
1730                         ...)  G_GNUC_PRINTF (5, 6);
1731 static void
1732 gtk_css_provider_error (GtkCssProvider *provider,
1733                         GtkCssScanner  *scanner,
1734                         GQuark          domain,
1735                         gint            code,
1736                         const char     *format,
1737                         ...)
1738 {
1739   GError *error;
1740   va_list args;
1741
1742   va_start (args, format);
1743   error = g_error_new_valist (domain, code, format, args);
1744   va_end (args);
1745
1746   gtk_css_provider_take_error (provider, scanner, error);
1747 }
1748
1749 static void
1750 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1751                                 GtkCssScanner  *scanner,
1752                                 const char     *expected)
1753 {
1754   gtk_css_provider_error (provider,
1755                           scanner,
1756                           GTK_CSS_PROVIDER_ERROR,
1757                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1758                           "expected a valid %s", expected);
1759 }
1760
1761 static void
1762 css_provider_commit (GtkCssProvider *css_provider,
1763                      GSList         *selectors,
1764                      GtkCssRuleset  *ruleset)
1765 {
1766   GtkCssProviderPrivate *priv;
1767   GSList *l;
1768
1769   priv = css_provider->priv;
1770
1771   if (ruleset->styles == NULL && ruleset->widget_style == NULL)
1772     {
1773       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
1774       return;
1775     }
1776
1777   for (l = selectors; l; l = l->next)
1778     {
1779       GtkCssRuleset new;
1780
1781       gtk_css_ruleset_init_copy (&new, ruleset, l->data);
1782
1783       g_array_append_val (priv->rulesets, new);
1784     }
1785
1786   g_slist_free (selectors);
1787 }
1788
1789 static void
1790 gtk_css_provider_reset (GtkCssProvider *css_provider)
1791 {
1792   GtkCssProviderPrivate *priv;
1793   guint i;
1794
1795   priv = css_provider->priv;
1796
1797   if (priv->resource)
1798     {
1799       g_resources_unregister (priv->resource);
1800       g_resource_unref (priv->resource);
1801       priv->resource = NULL;
1802     }
1803
1804   g_hash_table_remove_all (priv->symbolic_colors);
1805   g_hash_table_remove_all (priv->keyframes);
1806
1807   for (i = 0; i < priv->rulesets->len; i++)
1808     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1809   g_array_set_size (priv->rulesets, 0);
1810 }
1811
1812 static void
1813 gtk_css_provider_propagate_error (GtkCssProvider  *provider,
1814                                   GtkCssSection   *section,
1815                                   const GError    *error,
1816                                   GError         **propagate_to)
1817 {
1818
1819   GFileInfo *info;
1820   GFile *file;
1821   const char *path;
1822
1823   file = gtk_css_section_get_file (section);
1824   if (file)
1825     {
1826       info = g_file_query_info (file,G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME, 0, NULL, NULL);
1827
1828       if (info)
1829         path = g_file_info_get_display_name (info);
1830       else
1831         path = "<broken file>";
1832     }
1833   else
1834     {
1835       info = NULL;
1836       path = "<unknown>";
1837     }
1838
1839   /* don't fail for deprecations */
1840   if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
1841     {
1842       g_warning ("Theme parsing error: %s:%u:%u: %s", path,
1843                  gtk_css_section_get_end_line (section) + 1,
1844                  gtk_css_section_get_end_position (section), error->message);
1845       return;
1846     }
1847
1848   /* we already set an error. And we'd like to keep the first one */
1849   if (*propagate_to)
1850     return;
1851
1852   *propagate_to = g_error_copy (error);
1853   g_prefix_error (propagate_to, "%s:%u:%u: ", path,
1854                   gtk_css_section_get_end_line (section) + 1,
1855                   gtk_css_section_get_end_position (section));
1856
1857   if (info)
1858     g_object_unref (info);
1859 }
1860
1861 static gboolean
1862 parse_import (GtkCssScanner *scanner)
1863 {
1864   GFile *file;
1865
1866   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_IMPORT);
1867
1868   if (!_gtk_css_parser_try (scanner->parser, "@import", TRUE))
1869     {
1870       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1871       return FALSE;
1872     }
1873
1874   if (_gtk_css_parser_is_string (scanner->parser))
1875     {
1876       char *uri;
1877
1878       uri = _gtk_css_parser_read_string (scanner->parser);
1879       file = _gtk_css_parser_get_file_for_path (scanner->parser, uri);
1880       g_free (uri);
1881     }
1882   else
1883     {
1884       file = _gtk_css_parser_read_url (scanner->parser);
1885     }
1886
1887   if (file == NULL)
1888     {
1889       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1890       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1891       return TRUE;
1892     }
1893
1894   if (!_gtk_css_parser_try (scanner->parser, ";", FALSE))
1895     {
1896       gtk_css_provider_invalid_token (scanner->provider, scanner, "semicolon");
1897       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1898     }
1899   else if (gtk_css_scanner_would_recurse (scanner, file))
1900     {
1901        char *path = g_file_get_path (file);
1902        gtk_css_provider_error (scanner->provider,
1903                                scanner,
1904                                GTK_CSS_PROVIDER_ERROR,
1905                                GTK_CSS_PROVIDER_ERROR_IMPORT,
1906                                "Loading '%s' would recurse",
1907                                path);
1908        g_free (path);
1909     }
1910   else
1911     {
1912       gtk_css_provider_load_internal (scanner->provider,
1913                                       scanner,
1914                                       file,
1915                                       NULL,
1916                                       NULL);
1917     }
1918
1919   g_object_unref (file);
1920
1921   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1922   _gtk_css_parser_skip_whitespace (scanner->parser);
1923
1924   return TRUE;
1925 }
1926
1927 static gboolean
1928 parse_color_definition (GtkCssScanner *scanner)
1929 {
1930   GtkCssValue *symbolic;
1931   char *name;
1932
1933   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1934
1935   if (!_gtk_css_parser_try (scanner->parser, "@define-color", TRUE))
1936     {
1937       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1938       return FALSE;
1939     }
1940
1941   name = _gtk_css_parser_try_name (scanner->parser, TRUE);
1942   if (name == NULL)
1943     {
1944       gtk_css_provider_error_literal (scanner->provider,
1945                                       scanner,
1946                                       GTK_CSS_PROVIDER_ERROR,
1947                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1948                                       "Not a valid color name");
1949       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1950       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1951       return TRUE;
1952     }
1953
1954   symbolic = _gtk_css_symbolic_value_new (scanner->parser);
1955   if (symbolic == NULL)
1956     {
1957       g_free (name);
1958       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1959       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1960       return TRUE;
1961     }
1962
1963   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1964     {
1965       g_free (name);
1966       _gtk_css_value_unref (symbolic);
1967       gtk_css_provider_error_literal (scanner->provider,
1968                                       scanner,
1969                                       GTK_CSS_PROVIDER_ERROR,
1970                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1971                                       "Missing semicolon at end of color definition");
1972       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1973
1974       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1975       return TRUE;
1976     }
1977
1978   g_hash_table_insert (scanner->provider->priv->symbolic_colors, name, symbolic);
1979
1980   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1981   return TRUE;
1982 }
1983
1984 static gboolean
1985 parse_binding_set (GtkCssScanner *scanner)
1986 {
1987   GtkBindingSet *binding_set;
1988   char *name;
1989
1990   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1991
1992   if (!_gtk_css_parser_try (scanner->parser, "@binding-set", TRUE))
1993     {
1994       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1995       return FALSE;
1996     }
1997
1998   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1999   if (name == NULL)
2000     {
2001       gtk_css_provider_error_literal (scanner->provider,
2002                                       scanner,
2003                                       GTK_CSS_PROVIDER_ERROR,
2004                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2005                                       "Expected name for binding set");
2006       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2007       goto skip_semicolon;
2008     }
2009
2010   binding_set = gtk_binding_set_find (name);
2011   if (!binding_set)
2012     {
2013       binding_set = gtk_binding_set_new (name);
2014       binding_set->parsed = TRUE;
2015     }
2016   g_free (name);
2017
2018   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2019     {
2020       gtk_css_provider_error_literal (scanner->provider,
2021                                       scanner,
2022                                       GTK_CSS_PROVIDER_ERROR,
2023                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2024                                       "Expected '{' for binding set");
2025       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2026       goto skip_semicolon;
2027     }
2028
2029   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2030          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2031     {
2032       name = _gtk_css_parser_read_value (scanner->parser);
2033       if (name == NULL)
2034         {
2035           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2036           continue;
2037         }
2038
2039       if (gtk_binding_entry_add_signal_from_string (binding_set, name) != G_TOKEN_NONE)
2040         {
2041           gtk_css_provider_error_literal (scanner->provider,
2042                                           scanner,
2043                                           GTK_CSS_PROVIDER_ERROR,
2044                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2045                                           "Failed to parse binding set.");
2046         }
2047
2048       g_free (name);
2049
2050       if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2051         {
2052           if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2053               !_gtk_css_parser_is_eof (scanner->parser))
2054             {
2055               gtk_css_provider_error_literal (scanner->provider,
2056                                               scanner,
2057                                               GTK_CSS_PROVIDER_ERROR,
2058                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
2059                                               "Expected semicolon");
2060               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2061             }
2062         }
2063     }
2064
2065   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2066     {
2067       gtk_css_provider_error_literal (scanner->provider,
2068                                       scanner,
2069                                       GTK_CSS_PROVIDER_ERROR,
2070                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2071                                       "expected '}' after declarations");
2072       if (!_gtk_css_parser_is_eof (scanner->parser))
2073         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2074     }
2075
2076 skip_semicolon:
2077   if (_gtk_css_parser_begins_with (scanner->parser, ';'))
2078     {
2079       gtk_css_provider_error_literal (scanner->provider,
2080                                       scanner,
2081                                       GTK_CSS_PROVIDER_ERROR,
2082                                       GTK_CSS_PROVIDER_ERROR_DEPRECATED,
2083                                       "Nonstandard semicolon at end of binding set");
2084       _gtk_css_parser_try (scanner->parser, ";", TRUE);
2085     }
2086
2087   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
2088
2089   return TRUE;
2090 }
2091
2092 static gboolean
2093 parse_keyframes (GtkCssScanner *scanner)
2094 {
2095   GtkCssKeyframes *keyframes;
2096   char *name;
2097
2098   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_KEYFRAMES);
2099
2100   if (!_gtk_css_parser_try (scanner->parser, "@keyframes", TRUE))
2101     {
2102       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_KEYFRAMES);
2103       return FALSE;
2104     }
2105
2106   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2107   if (name == NULL)
2108     {
2109       gtk_css_provider_error_literal (scanner->provider,
2110                                       scanner,
2111                                       GTK_CSS_PROVIDER_ERROR,
2112                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2113                                       "Expected name for keyframes");
2114       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2115       goto exit;
2116     }
2117
2118   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2119     {
2120       gtk_css_provider_error_literal (scanner->provider,
2121                                       scanner,
2122                                       GTK_CSS_PROVIDER_ERROR,
2123                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2124                                       "Expected '{' for keyframes");
2125       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2126       g_free (name);
2127       goto exit;
2128     }
2129
2130   keyframes = _gtk_css_keyframes_parse (scanner->parser);
2131   if (keyframes == NULL)
2132     {
2133       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2134       g_free (name);
2135       goto exit;
2136     }
2137
2138   g_hash_table_insert (scanner->provider->priv->keyframes, name, keyframes);
2139
2140   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2141     {
2142       gtk_css_provider_error_literal (scanner->provider,
2143                                       scanner,
2144                                       GTK_CSS_PROVIDER_ERROR,
2145                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2146                                       "expected '}' after declarations");
2147       if (!_gtk_css_parser_is_eof (scanner->parser))
2148         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2149     }
2150
2151 exit:
2152   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_KEYFRAMES);
2153
2154   return TRUE;
2155 }
2156
2157 static void
2158 parse_at_keyword (GtkCssScanner *scanner)
2159 {
2160   if (parse_import (scanner))
2161     return;
2162   if (parse_color_definition (scanner))
2163     return;
2164   if (parse_binding_set (scanner))
2165     return;
2166   if (parse_keyframes (scanner))
2167     return;
2168
2169   else
2170     {
2171       gtk_css_provider_error_literal (scanner->provider,
2172                                       scanner,
2173                                       GTK_CSS_PROVIDER_ERROR,
2174                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2175                                       "unknown @ rule");
2176       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2177     }
2178 }
2179
2180 static GSList *
2181 parse_selector_list (GtkCssScanner *scanner)
2182 {
2183   GSList *selectors = NULL;
2184
2185   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_SELECTOR);
2186
2187   do {
2188       GtkCssSelector *select = _gtk_css_selector_parse (scanner->parser);
2189
2190       if (select == NULL)
2191         {
2192           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2193           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2194           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2195           return NULL;
2196         }
2197
2198       selectors = g_slist_prepend (selectors, select);
2199     }
2200   while (_gtk_css_parser_try (scanner->parser, ",", TRUE));
2201
2202   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2203
2204   return selectors;
2205 }
2206
2207 static void
2208 parse_declaration (GtkCssScanner *scanner,
2209                    GtkCssRuleset *ruleset)
2210 {
2211   GtkStyleProperty *property;
2212   char *name;
2213
2214   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DECLARATION);
2215
2216   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2217   if (name == NULL)
2218     goto check_for_semicolon;
2219
2220   property = _gtk_style_property_lookup (name);
2221   if (property == NULL && name[0] != '-')
2222     {
2223       gtk_css_provider_error (scanner->provider,
2224                               scanner,
2225                               GTK_CSS_PROVIDER_ERROR,
2226                               GTK_CSS_PROVIDER_ERROR_NAME,
2227                               "'%s' is not a valid property name",
2228                               name);
2229       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2230       g_free (name);
2231       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2232       return;
2233     }
2234
2235   if (!_gtk_css_parser_try (scanner->parser, ":", TRUE))
2236     {
2237       gtk_css_provider_invalid_token (scanner->provider, scanner, "':'");
2238       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2239       g_free (name);
2240       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2241       return;
2242     }
2243
2244   if (property)
2245     {
2246       GtkCssValue *value;
2247
2248       g_free (name);
2249
2250       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2251
2252       value = _gtk_style_property_parse_value (property,
2253                                                scanner->parser);
2254
2255       if (value == NULL)
2256         {
2257           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2258           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2259           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2260           return;
2261         }
2262
2263       if (!_gtk_css_parser_begins_with (scanner->parser, ';') &&
2264           !_gtk_css_parser_begins_with (scanner->parser, '}') &&
2265           !_gtk_css_parser_is_eof (scanner->parser))
2266         {
2267           gtk_css_provider_error_literal (scanner->provider,
2268                                           scanner,
2269                                           GTK_CSS_PROVIDER_ERROR,
2270                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2271                                           "Junk at end of value");
2272           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2273           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2274           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2275           return;
2276         }
2277
2278       if (GTK_IS_CSS_SHORTHAND_PROPERTY (property))
2279         {
2280           GtkCssShorthandProperty *shorthand = GTK_CSS_SHORTHAND_PROPERTY (property);
2281           guint i;
2282
2283           for (i = 0; i < _gtk_css_shorthand_property_get_n_subproperties (shorthand); i++)
2284             {
2285               GtkCssStyleProperty *child = _gtk_css_shorthand_property_get_subproperty (shorthand, i);
2286               GtkCssValue *sub = _gtk_css_array_value_get_nth (value, i);
2287
2288               gtk_css_ruleset_add (ruleset, child, _gtk_css_value_ref (sub), scanner->section);
2289             }
2290
2291             _gtk_css_value_unref (value);
2292         }
2293       else if (GTK_IS_CSS_STYLE_PROPERTY (property))
2294         {
2295           gtk_css_ruleset_add (ruleset, GTK_CSS_STYLE_PROPERTY (property), value, scanner->section);
2296         }
2297       else
2298         {
2299           g_assert_not_reached ();
2300           _gtk_css_value_unref (value);
2301         }
2302
2303
2304       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2305     }
2306   else if (name[0] == '-')
2307     {
2308       char *value_str;
2309
2310       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2311
2312       value_str = _gtk_css_parser_read_value (scanner->parser);
2313       if (value_str)
2314         {
2315           WidgetPropertyValue *val;
2316
2317           val = widget_property_value_new (name, scanner->section);
2318           val->value = value_str;
2319
2320           gtk_css_ruleset_add_style (ruleset, name, val);
2321         }
2322       else
2323         {
2324           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2325           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2326           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2327           return;
2328         }
2329
2330       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2331     }
2332   else
2333     g_free (name);
2334
2335 check_for_semicolon:
2336   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2337
2338   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2339     {
2340       if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2341           !_gtk_css_parser_is_eof (scanner->parser))
2342         {
2343           gtk_css_provider_error_literal (scanner->provider,
2344                                           scanner,
2345                                           GTK_CSS_PROVIDER_ERROR,
2346                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2347                                           "Expected semicolon");
2348           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2349         }
2350     }
2351 }
2352
2353 static void
2354 parse_declarations (GtkCssScanner *scanner,
2355                     GtkCssRuleset *ruleset)
2356 {
2357   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2358          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2359     {
2360       parse_declaration (scanner, ruleset);
2361     }
2362 }
2363
2364 static void
2365 parse_ruleset (GtkCssScanner *scanner)
2366 {
2367   GSList *selectors;
2368   GtkCssRuleset ruleset = { 0, };
2369
2370   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_RULESET);
2371
2372   selectors = parse_selector_list (scanner);
2373   if (selectors == NULL)
2374     {
2375       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2376       return;
2377     }
2378
2379   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2380     {
2381       gtk_css_provider_error_literal (scanner->provider,
2382                                       scanner,
2383                                       GTK_CSS_PROVIDER_ERROR,
2384                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2385                                       "expected '{' after selectors");
2386       _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2387       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2388       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2389       return;
2390     }
2391
2392   parse_declarations (scanner, &ruleset);
2393
2394   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2395     {
2396       gtk_css_provider_error_literal (scanner->provider,
2397                                       scanner,
2398                                       GTK_CSS_PROVIDER_ERROR,
2399                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2400                                       "expected '}' after declarations");
2401       if (!_gtk_css_parser_is_eof (scanner->parser))
2402         {
2403           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2404           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2405           gtk_css_ruleset_clear (&ruleset);
2406           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2407         }
2408     }
2409
2410   css_provider_commit (scanner->provider, selectors, &ruleset);
2411   gtk_css_ruleset_clear (&ruleset);
2412   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2413 }
2414
2415 static void
2416 parse_statement (GtkCssScanner *scanner)
2417 {
2418   if (_gtk_css_parser_begins_with (scanner->parser, '@'))
2419     parse_at_keyword (scanner);
2420   else
2421     parse_ruleset (scanner);
2422 }
2423
2424 static void
2425 parse_stylesheet (GtkCssScanner *scanner)
2426 {
2427   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2428
2429   _gtk_css_parser_skip_whitespace (scanner->parser);
2430
2431   while (!_gtk_css_parser_is_eof (scanner->parser))
2432     {
2433       if (_gtk_css_parser_try (scanner->parser, "<!--", TRUE) ||
2434           _gtk_css_parser_try (scanner->parser, "-->", TRUE))
2435         continue;
2436
2437       parse_statement (scanner);
2438     }
2439
2440   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2441 }
2442
2443 static int
2444 gtk_css_provider_compare_rule (gconstpointer a_,
2445                                gconstpointer b_)
2446 {
2447   const GtkCssRuleset *a = (const GtkCssRuleset *) a_;
2448   const GtkCssRuleset *b = (const GtkCssRuleset *) b_;
2449   int compare;
2450
2451   compare = _gtk_css_selector_compare (a->selector, b->selector);
2452   if (compare != 0)
2453     return compare;
2454
2455   return 0;
2456 }
2457
2458 static void
2459 gtk_css_provider_postprocess (GtkCssProvider *css_provider)
2460 {
2461   GtkCssProviderPrivate *priv = css_provider->priv;
2462
2463   g_array_sort (priv->rulesets, gtk_css_provider_compare_rule);
2464 }
2465
2466 static gboolean
2467 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
2468                                 GtkCssScanner  *parent,
2469                                 GFile          *file,
2470                                 const char     *text,
2471                                 GError        **error)
2472 {
2473   GtkCssScanner *scanner;
2474   gulong error_handler;
2475   char *free_data = NULL;
2476
2477   if (error)
2478     error_handler = g_signal_connect (css_provider,
2479                                       "parsing-error",
2480                                       G_CALLBACK (gtk_css_provider_propagate_error),
2481                                       error);
2482   else
2483     error_handler = 0; /* silence gcc */
2484
2485   if (text == NULL)
2486     {
2487       GError *load_error = NULL;
2488
2489       if (g_file_load_contents (file, NULL,
2490                                 &free_data, NULL,
2491                                 NULL, &load_error))
2492         {
2493           text = free_data;
2494         }
2495       else
2496         {
2497           GtkCssSection *section;
2498
2499           if (parent)
2500             section = gtk_css_section_ref (parent->section);
2501           else
2502             section = _gtk_css_section_new_for_file (GTK_CSS_SECTION_DOCUMENT, file);
2503
2504           gtk_css_provider_error (css_provider,
2505                                   parent,
2506                                   GTK_CSS_PROVIDER_ERROR,
2507                                   GTK_CSS_PROVIDER_ERROR_IMPORT,
2508                                   "Failed to import: %s",
2509                                   load_error->message);
2510
2511           gtk_css_section_unref (section);
2512         }
2513     }
2514
2515   if (text)
2516     {
2517       scanner = gtk_css_scanner_new (css_provider,
2518                                      parent,
2519                                      parent ? parent->section : NULL,
2520                                      file,
2521                                      text);
2522
2523       parse_stylesheet (scanner);
2524
2525       gtk_css_scanner_destroy (scanner);
2526
2527       if (parent == NULL)
2528         gtk_css_provider_postprocess (css_provider);
2529     }
2530
2531   g_free (free_data);
2532
2533   if (error)
2534     {
2535       g_signal_handler_disconnect (css_provider, error_handler);
2536
2537       if (*error)
2538         {
2539           /* We clear all contents from the provider for backwards compat reasons */
2540           gtk_css_provider_reset (css_provider);
2541           return FALSE;
2542         }
2543     }
2544
2545   return TRUE;
2546 }
2547
2548 /**
2549  * gtk_css_provider_load_from_data:
2550  * @css_provider: a #GtkCssProvider
2551  * @data: (array length=length) (element-type guint8): CSS data loaded in memory
2552  * @length: the length of @data in bytes, or -1 for NUL terminated strings. If
2553  *   @length is not -1, the code will assume it is not NUL terminated and will
2554  *   potentially do a copy.
2555  * @error: (out) (allow-none): return location for a #GError, or %NULL
2556  *
2557  * Loads @data into @css_provider, making it clear any previously loaded
2558  * information.
2559  *
2560  * Returns: %TRUE if the data could be loaded.
2561  **/
2562 gboolean
2563 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2564                                  const gchar     *data,
2565                                  gssize           length,
2566                                  GError         **error)
2567 {
2568   char *free_data;
2569   gboolean ret;
2570
2571   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2572   g_return_val_if_fail (data != NULL, FALSE);
2573
2574   if (length < 0)
2575     {
2576       length = strlen (data);
2577       free_data = NULL;
2578     }
2579   else
2580     {
2581       free_data = g_strndup (data, length);
2582       data = free_data;
2583     }
2584
2585   gtk_css_provider_reset (css_provider);
2586
2587   ret = gtk_css_provider_load_internal (css_provider, NULL, NULL, data, error);
2588
2589   g_free (free_data);
2590
2591   _gtk_style_provider_private_changed (GTK_STYLE_PROVIDER_PRIVATE (css_provider));
2592
2593   return ret;
2594 }
2595
2596 /**
2597  * gtk_css_provider_load_from_file:
2598  * @css_provider: a #GtkCssProvider
2599  * @file: #GFile pointing to a file to load
2600  * @error: (out) (allow-none): return location for a #GError, or %NULL
2601  *
2602  * Loads the data contained in @file into @css_provider, making it
2603  * clear any previously loaded information.
2604  *
2605  * Returns: %TRUE if the data could be loaded.
2606  **/
2607 gboolean
2608 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2609                                  GFile           *file,
2610                                  GError         **error)
2611 {
2612   gboolean success;
2613
2614   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2615   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2616
2617   gtk_css_provider_reset (css_provider);
2618
2619   success = gtk_css_provider_load_internal (css_provider, NULL, file, NULL, error);
2620
2621   _gtk_style_provider_private_changed (GTK_STYLE_PROVIDER_PRIVATE (css_provider));
2622
2623   return success;
2624 }
2625
2626 /**
2627  * gtk_css_provider_load_from_path:
2628  * @css_provider: a #GtkCssProvider
2629  * @path: the path of a filename to load, in the GLib filename encoding
2630  * @error: (out) (allow-none): return location for a #GError, or %NULL
2631  *
2632  * Loads the data contained in @path into @css_provider, making it clear
2633  * any previously loaded information.
2634  *
2635  * Returns: %TRUE if the data could be loaded.
2636  **/
2637 gboolean
2638 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2639                                  const gchar     *path,
2640                                  GError         **error)
2641 {
2642   GFile *file;
2643   gboolean result;
2644
2645   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2646   g_return_val_if_fail (path != NULL, FALSE);
2647
2648   file = g_file_new_for_path (path);
2649
2650   result = gtk_css_provider_load_from_file (css_provider, file, error);
2651
2652   g_object_unref (file);
2653
2654   return result;
2655 }
2656
2657 static gboolean
2658 _gtk_css_provider_load_from_resource (GtkCssProvider  *css_provider,
2659                                       const gchar     *resource_path)
2660 {
2661   GFile *file;
2662   char *uri, *escaped;
2663   gboolean result;
2664
2665   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2666   g_return_val_if_fail (resource_path != NULL, FALSE);
2667
2668   escaped = g_uri_escape_string (resource_path,
2669                                  G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, FALSE);
2670   uri = g_strconcat ("resource://", escaped, NULL);
2671   g_free (escaped);
2672
2673   file = g_file_new_for_uri (uri);
2674   g_free (uri);
2675
2676   result = gtk_css_provider_load_from_file (css_provider, file, NULL);
2677
2678   g_object_unref (file);
2679
2680   return result;
2681 }
2682
2683 static char *
2684 _find_theme_path (const gchar    *name,
2685                   const gchar    *variant)
2686 {
2687   gchar *subpath;
2688   gchar *path = NULL;
2689
2690   if (variant)
2691     subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
2692   else
2693     subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
2694
2695   /* First look in the user's config directory
2696    */
2697   path = g_build_filename (g_get_user_data_dir (), "themes", name, subpath, NULL);
2698   if (!g_file_test (path, G_FILE_TEST_EXISTS))
2699     {
2700       g_free (path);
2701       path = NULL;
2702     }
2703
2704   /* Next look in the user's home directory
2705    */
2706   if (!path)
2707     {
2708       const gchar *home_dir;
2709
2710       home_dir = g_get_home_dir ();
2711       if (home_dir)
2712         {
2713           path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
2714
2715           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2716             {
2717               g_free (path);
2718               path = NULL;
2719             }
2720         }
2721     }
2722
2723   if (!path)
2724     {
2725       gchar *theme_dir;
2726
2727       theme_dir = _gtk_css_provider_get_theme_dir ();
2728       path = g_build_filename (theme_dir, name, subpath, NULL);
2729       g_free (theme_dir);
2730
2731       if (!g_file_test (path, G_FILE_TEST_EXISTS))
2732         {
2733           g_free (path);
2734           path = NULL;
2735         }
2736     }
2737
2738   g_free (subpath);
2739
2740   return path;
2741 }
2742
2743 static gboolean
2744 _provider_load (GtkCssProvider *provider,
2745                 const gchar    *name,
2746                 const gchar    *variant)
2747 {
2748   gchar *resource_path;
2749   gboolean loaded = FALSE;
2750
2751   g_assert (provider != NULL);
2752
2753   if (variant)
2754     resource_path = g_strdup_printf ("/org/gtk/libgtk/%s-%s.css", name, variant);
2755   else
2756     resource_path = g_strdup_printf ("/org/gtk/libgtk/%s.css", name);
2757
2758   if (g_resources_get_info (resource_path, 0, NULL, NULL, NULL))
2759     {
2760       loaded = _gtk_css_provider_load_from_resource (provider, resource_path);
2761     }
2762   g_free (resource_path);
2763
2764   if (!loaded)
2765     {
2766       char *path;
2767
2768       path = _find_theme_path (name, variant);
2769
2770       if (path)
2771         {
2772           char *dir;
2773           char *resource_file;
2774           GResource *resource;
2775
2776           dir = g_path_get_dirname (path);
2777           resource_file = g_build_filename (dir, "gtk.gresource", NULL);
2778           resource = g_resource_load (resource_file, NULL);
2779           g_free (resource_file);
2780
2781           if (resource != NULL)
2782             g_resources_register (resource);
2783
2784           loaded = gtk_css_provider_load_from_path (provider, path, NULL);
2785           if (!loaded)
2786             {
2787               if (resource != NULL)
2788                 {
2789                   g_resources_unregister (resource);
2790                   g_resource_unref (resource);
2791                 }
2792             }
2793           else
2794             {
2795               /* Only set this after load success, as load_from_path will clear it */
2796               provider->priv->resource = resource;
2797             }
2798
2799           g_free (dir);
2800         }
2801       g_free (path);
2802     }
2803
2804   return loaded;
2805 }
2806
2807 static void
2808 destroy_theme_cache (GHashTable *themes)
2809 {
2810   g_hash_table_destroy (themes);
2811 }
2812
2813 /*
2814  * _gtk_css_provider_get_named_for_screen:
2815  * @screen: a #GdkScreen.
2816  * @name: A theme name
2817  * @variant: (allow-none): variant to load, for example, "dark", or
2818  *     %NULL for the default
2819  *
2820  * Loads a theme from the usual theme paths
2821  *
2822  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
2823  *     This memory is owned by GTK+, and you must not free it.
2824  */
2825 GtkCssProvider *
2826 _gtk_css_provider_get_named_for_screen (GdkScreen   *screen,
2827                                         const gchar *name,
2828                                         const gchar *variant)
2829 {
2830   GtkCssProvider *provider;
2831   GHashTable *themes;
2832   gchar *key;
2833
2834   g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
2835
2836   themes = g_object_get_data (G_OBJECT (screen), "gtk-themes");
2837   if (G_UNLIKELY (!themes))
2838     {
2839       themes = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);
2840       g_object_set_data_full (G_OBJECT (screen),
2841                               I_("gtk-themes"),
2842                               themes,
2843                               (GDestroyNotify)destroy_theme_cache);
2844     }
2845
2846   if (name == NULL)
2847     key = g_strdup ("");
2848   else if (variant == NULL)
2849     key = g_strdup (name);
2850   else
2851     key = g_strconcat (name, "-", variant, NULL);
2852
2853   provider = g_hash_table_lookup (themes, key);
2854
2855   if (!provider)
2856     {
2857       gboolean save = TRUE;
2858
2859       provider = gtk_css_provider_new ();
2860
2861       if (name != NULL)
2862         save = _provider_load (provider, name, variant);
2863
2864       if (save)
2865         g_hash_table_insert (themes, g_strdup (key), provider);
2866     }
2867
2868   g_free (key);
2869
2870   return provider;
2871 }
2872
2873 /**
2874  * gtk_css_provider_get_default:
2875  *
2876  * Returns the provider containing the style settings used as a
2877  * fallback for all widgets.
2878  *
2879  * Returns: (transfer none): The provider used for fallback styling.
2880  *          This memory is owned by GTK+, and you must not free it.
2881  **/
2882 GtkCssProvider *
2883 gtk_css_provider_get_default (void)
2884 {
2885   GdkScreen *screen = gdk_screen_get_default ();
2886
2887   if (screen)
2888     return _gtk_css_provider_get_named_for_screen (screen, NULL, NULL);
2889   else
2890     return NULL;
2891 }
2892
2893 /**
2894  * gtk_css_provider_get_named:
2895  * @name: A theme name
2896  * @variant: (allow-none): variant to load, for example, "dark", or
2897  *     %NULL for the default
2898  *
2899  * Loads a theme from the usual theme paths
2900  *
2901  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
2902  *     This memory is owned by GTK+, and you must not free it.
2903  */
2904 GtkCssProvider *
2905 gtk_css_provider_get_named (const gchar *name,
2906                             const gchar *variant)
2907 {
2908   GdkScreen *screen = gdk_screen_get_default ();
2909
2910   if (screen)
2911     return _gtk_css_provider_get_named_for_screen (screen, name, variant);
2912   else
2913     return NULL;
2914 }
2915
2916 gchar *
2917 _gtk_css_provider_get_theme_dir (void)
2918 {
2919   const gchar *var;
2920   gchar *path;
2921
2922   var = g_getenv ("GTK_DATA_PREFIX");
2923
2924   if (var)
2925     path = g_build_filename (var, "share", "themes", NULL);
2926   else
2927     path = g_build_filename (_gtk_get_data_prefix (), "share", "themes", NULL);
2928
2929   return path;
2930 }
2931
2932 static int
2933 compare_properties (gconstpointer a, gconstpointer b, gpointer style)
2934 {
2935   const guint *ua = a;
2936   const guint *ub = b;
2937   PropertyValue *styles = style;
2938
2939   return strcmp (_gtk_style_property_get_name (GTK_STYLE_PROPERTY (styles[*ua].property)),
2940                  _gtk_style_property_get_name (GTK_STYLE_PROPERTY (styles[*ub].property)));
2941 }
2942
2943 static int
2944 compare_names (gconstpointer a, gconstpointer b)
2945 {
2946   const WidgetPropertyValue *aa = a;
2947   const WidgetPropertyValue *bb = b;
2948   return strcmp (aa->name, bb->name);
2949 }
2950
2951 static void
2952 gtk_css_ruleset_print (const GtkCssRuleset *ruleset,
2953                        GString             *str)
2954 {
2955   GList *values, *walk;
2956   WidgetPropertyValue *widget_value;
2957   guint i;
2958
2959   _gtk_css_selector_print (ruleset->selector, str);
2960
2961   g_string_append (str, " {\n");
2962
2963   if (ruleset->styles)
2964     {
2965       guint *sorted = g_new (guint, ruleset->n_styles);
2966
2967       for (i = 0; i < ruleset->n_styles; i++)
2968         sorted[i] = i;
2969
2970       /* so the output is identical for identical selector styles */
2971       g_qsort_with_data (sorted, ruleset->n_styles, sizeof (guint), compare_properties, ruleset->styles);
2972
2973       for (i = 0; i < ruleset->n_styles; i++)
2974         {
2975           PropertyValue *prop = &ruleset->styles[sorted[i]];
2976           g_string_append (str, "  ");
2977           g_string_append (str, _gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop->property)));
2978           g_string_append (str, ": ");
2979           _gtk_css_value_print (prop->value, str);
2980           g_string_append (str, ";\n");
2981         }
2982
2983       g_free (sorted);
2984     }
2985
2986   if (ruleset->widget_style)
2987     {
2988       values = NULL;
2989       for (widget_value = ruleset->widget_style; widget_value != NULL; widget_value = widget_value->next)
2990         values = g_list_prepend (values, widget_value);
2991
2992       /* so the output is identical for identical selector styles */
2993       values = g_list_sort (values, compare_names);
2994
2995       for (walk = values; walk; walk = walk->next)
2996         {
2997           widget_value = walk->data;
2998
2999           g_string_append (str, "  ");
3000           g_string_append (str, widget_value->name);
3001           g_string_append (str, ": ");
3002           g_string_append (str, widget_value->value);
3003           g_string_append (str, ";\n");
3004         }
3005
3006       g_list_free (values);
3007     }
3008
3009   g_string_append (str, "}\n");
3010 }
3011
3012 static void
3013 gtk_css_provider_print_colors (GHashTable *colors,
3014                                GString    *str)
3015 {
3016   GList *keys, *walk;
3017   char *s;
3018
3019   keys = g_hash_table_get_keys (colors);
3020   /* so the output is identical for identical styles */
3021   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3022
3023   for (walk = keys; walk; walk = walk->next)
3024     {
3025       const char *name = walk->data;
3026       GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
3027
3028       g_string_append (str, "@define-color ");
3029       g_string_append (str, name);
3030       g_string_append (str, " ");
3031       s = gtk_symbolic_color_to_string (symbolic);
3032       g_string_append (str, s);
3033       g_free (s);
3034       g_string_append (str, ";\n");
3035     }
3036
3037   g_list_free (keys);
3038 }
3039
3040 static void
3041 gtk_css_provider_print_keyframes (GHashTable *keyframes,
3042                                   GString    *str)
3043 {
3044   GList *keys, *walk;
3045
3046   keys = g_hash_table_get_keys (keyframes);
3047   /* so the output is identical for identical styles */
3048   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3049
3050   for (walk = keys; walk; walk = walk->next)
3051     {
3052       const char *name = walk->data;
3053       GtkCssKeyframes *keyframe = g_hash_table_lookup (keyframes, (gpointer) name);
3054
3055       if (str->len > 0)
3056         g_string_append (str, "\n");
3057       g_string_append (str, "@keyframes ");
3058       g_string_append (str, name);
3059       g_string_append (str, " {\n");
3060       _gtk_css_keyframes_print (keyframe, str);
3061       g_string_append (str, "}\n");
3062     }
3063
3064   g_list_free (keys);
3065 }
3066
3067 /**
3068  * gtk_css_provider_to_string:
3069  * @provider: the provider to write to a string
3070  *
3071  * Convertes the @provider into a string representation in CSS
3072  * format.
3073  *
3074  * Using gtk_css_provider_load_from_data() with the return value
3075  * from this function on a new provider created with
3076  * gtk_css_provider_new() will basicallu create a duplicate of
3077  * this @provider.
3078  *
3079  * Returns: a new string representing the @provider.
3080  *
3081  * Since: 3.2
3082  **/
3083 char *
3084 gtk_css_provider_to_string (GtkCssProvider *provider)
3085 {
3086   GtkCssProviderPrivate *priv;
3087   GString *str;
3088   guint i;
3089
3090   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
3091
3092   priv = provider->priv;
3093
3094   str = g_string_new ("");
3095
3096   gtk_css_provider_print_colors (priv->symbolic_colors, str);
3097   gtk_css_provider_print_keyframes (priv->keyframes, str);
3098
3099   for (i = 0; i < priv->rulesets->len; i++)
3100     {
3101       if (str->len != 0)
3102         g_string_append (str, "\n");
3103       gtk_css_ruleset_print (&g_array_index (priv->rulesets, GtkCssRuleset, i), str);
3104     }
3105
3106   return g_string_free (str, FALSE);
3107 }
3108