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 "gtkcsscolorvalueprivate.h"
  31 #include "gtkcsskeyframesprivate.h"
  32 #include "gtkcssparserprivate.h"
  33 #include "gtkcsssectionprivate.h"
  34 #include "gtkcssselectorprivate.h"
  35 #include "gtkcssshorthandpropertyprivate.h"
  36 #include "gtkcssstylefuncsprivate.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   GtkCssSelectorTree *selector_match;
 990   WidgetPropertyValue *widget_style;
 991   PropertyValue *styles;
 992   GtkBitmask *set_styles;
 993   guint n_styles;
 994   guint owns_styles : 1;
 995   guint owns_widget_style : 1;
 996 };
 997
 998 struct _GtkCssScanner
 999 {
1000   GtkCssProvider *provider;
1001   GtkCssParser *parser;
1002   GtkCssSection *section;
1003   GtkCssScanner *parent;
1004   GSList *state;
1005 };
1006
1007 struct _GtkCssProviderPrivate
1008 {
1009   GScanner *scanner;
1010
1011   GHashTable *symbolic_colors;
1012   GHashTable *keyframes;
1013
1014   GArray *rulesets;
1015   GtkCssSelectorTree *tree;
1016   GResource *resource;
1017 };
1018
1019 enum {
1020   PARSING_ERROR,
1021   LAST_SIGNAL
1022 };
1023
1024 static gboolean gtk_keep_css_sections = FALSE;
1025
1026 static guint css_provider_signals[LAST_SIGNAL] = { 0 };
1027
1028 static void gtk_css_provider_finalize (GObject *object);
1029 static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
1030 static void gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface);
1031 static void widget_property_value_list_free (WidgetPropertyValue *head);
1032
1033 static gboolean
1034 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
1035                                 GtkCssScanner  *scanner,
1036                                 GFile          *file,
1037                                 const char     *data,
1038                                 GError        **error);
1039
1040 GQuark
1041 gtk_css_provider_error_quark (void)
1042 {
1043   return g_quark_from_static_string ("gtk-css-provider-error-quark");
1044 }
1045
1046 G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
1047                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
1048                                                gtk_css_style_provider_iface_init)
1049                         G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER_PRIVATE,
1050                                                gtk_css_style_provider_private_iface_init));
1051
1052 static void
1053 gtk_css_provider_parsing_error (GtkCssProvider  *provider,
1054                                 GtkCssSection   *section,
1055                                 const GError    *error)
1056 {
1057   /* Only emit a warning when we have no error handlers. This is our
1058    * default handlers. And in this case erroneous CSS files are a bug
1059    * and should be fixed.
1060    * Note that these warnings can also be triggered by a broken theme
1061    * that people installed from some weird location on the internets.
1062    */
1063   if (!g_signal_has_handler_pending (provider,
1064                                      css_provider_signals[PARSING_ERROR],
1065                                      0,
1066                                      TRUE))
1067     {
1068       char *s = _gtk_css_section_to_string (section);
1069
1070       g_warning ("Theme parsing error: %s: %s",
1071                  s,
1072                  error->message);
1073
1074       g_free (s);
1075     }
1076 }
1077
1078 static void
1079 gtk_css_provider_class_init (GtkCssProviderClass *klass)
1080 {
1081   GObjectClass *object_class = G_OBJECT_CLASS (klass);
1082
1083   if (g_getenv ("GTK_CSS_DEBUG"))
1084     gtk_keep_css_sections = TRUE;
1085
1086   /**
1087    * GtkCssProvider::parsing-error:
1088    * @provider: the provider that had a parsing error
1089    * @section: section the error happened in
1090    * @error: The parsing error
1091    *
1092    * Signals that a parsing error occured. the @path, @line and @position
1093    * describe the actual location of the error as accurately as possible.
1094    *
1095    * Parsing errors are never fatal, so the parsing will resume after
1096    * the error. Errors may however cause parts of the given
1097    * data or even all of it to not be parsed at all. So it is a useful idea
1098    * to check that the parsing succeeds by connecting to this signal.
1099    *
1100    * Note that this signal may be emitted at any time as the css provider
1101    * may opt to defer parsing parts or all of the input to a later time
1102    * than when a loading function was called.
1103    */
1104   css_provider_signals[PARSING_ERROR] =
1105     g_signal_new (I_("parsing-error"),
1106                   G_TYPE_FROM_CLASS (object_class),
1107                   G_SIGNAL_RUN_LAST,
1108                   G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
1109                   NULL, NULL,
1110                   _gtk_marshal_VOID__BOXED_BOXED,
1111                   G_TYPE_NONE, 2, GTK_TYPE_CSS_SECTION, G_TYPE_ERROR);
1112
1113   object_class->finalize = gtk_css_provider_finalize;
1114
1115   klass->parsing_error = gtk_css_provider_parsing_error;
1116
1117   g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
1118 }
1119
1120 static void
1121 gtk_css_ruleset_init_copy (GtkCssRuleset       *new,
1122                            GtkCssRuleset       *ruleset,
1123                            GtkCssSelector      *selector)
1124 {
1125   memcpy (new, ruleset, sizeof (GtkCssRuleset));
1126
1127   new->selector = selector;
1128   /* First copy takes over ownership */
1129   if (ruleset->owns_styles)
1130     ruleset->owns_styles = FALSE;
1131   if (ruleset->owns_widget_style)
1132     ruleset->owns_widget_style = FALSE;
1133   if (new->set_styles)
1134     new->set_styles = _gtk_bitmask_copy (new->set_styles);
1135 }
1136
1137 static void
1138 gtk_css_ruleset_clear (GtkCssRuleset *ruleset)
1139 {
1140   if (ruleset->owns_styles)
1141     {
1142       guint i;
1143
1144       for (i = 0; i < ruleset->n_styles; i++)
1145         {
1146           _gtk_css_value_unref (ruleset->styles[i].value);
1147           ruleset->styles[i].value = NULL;
1148           if (ruleset->styles[i].section)
1149             gtk_css_section_unref (ruleset->styles[i].section);
1150         }
1151       g_free (ruleset->styles);
1152     }
1153   if (ruleset->set_styles)
1154     _gtk_bitmask_free (ruleset->set_styles);
1155   if (ruleset->owns_widget_style)
1156     widget_property_value_list_free (ruleset->widget_style);
1157   if (ruleset->selector)
1158     _gtk_css_selector_free (ruleset->selector);
1159
1160   memset (ruleset, 0, sizeof (GtkCssRuleset));
1161 }
1162
1163 static WidgetPropertyValue *
1164 widget_property_value_new (char *name, GtkCssSection *section)
1165 {
1166   WidgetPropertyValue *value;
1167
1168   value = g_slice_new0 (WidgetPropertyValue);
1169
1170   value->name = name;
1171   if (gtk_keep_css_sections)
1172     value->section = gtk_css_section_ref (section);
1173
1174   return value;
1175 }
1176
1177 static void
1178 widget_property_value_free (WidgetPropertyValue *value)
1179 {
1180   g_free (value->value);
1181   g_free (value->name);
1182   if (value->section)
1183     gtk_css_section_unref (value->section);
1184
1185   g_slice_free (WidgetPropertyValue, value);
1186 }
1187
1188 static void
1189 widget_property_value_list_free (WidgetPropertyValue *head)
1190 {
1191   WidgetPropertyValue *l, *next;
1192   for (l = head; l != NULL; l = next)
1193     {
1194       next = l->next;
1195       widget_property_value_free (l);
1196     }
1197 }
1198
1199 static WidgetPropertyValue *
1200 widget_property_value_list_remove_name (WidgetPropertyValue *head, const char *name)
1201 {
1202   WidgetPropertyValue *l, **last;
1203
1204   last = &head;
1205
1206   for (l = head; l != NULL; l = l->next)
1207     {
1208       if (strcmp (l->name, name) == 0)
1209         {
1210           *last = l->next;
1211           widget_property_value_free (l);
1212           break;
1213         }
1214
1215       last = &l->next;
1216     }
1217
1218   return head;
1219 }
1220
1221 static void
1222 gtk_css_ruleset_add_style (GtkCssRuleset *ruleset,
1223                            char          *name,
1224                            WidgetPropertyValue *value)
1225 {
1226   value->next = widget_property_value_list_remove_name (ruleset->widget_style, name);
1227   ruleset->widget_style = value;
1228   ruleset->owns_widget_style = TRUE;
1229 }
1230
1231 static void
1232 gtk_css_ruleset_add (GtkCssRuleset       *ruleset,
1233                      GtkCssStyleProperty *property,
1234                      GtkCssValue         *value,
1235                      GtkCssSection       *section)
1236 {
1237   guint i;
1238
1239   g_return_if_fail (ruleset->owns_styles || ruleset->n_styles == 0);
1240
1241   if (ruleset->set_styles == NULL)
1242     ruleset->set_styles = _gtk_bitmask_new ();
1243
1244   ruleset->set_styles = _gtk_bitmask_set (ruleset->set_styles,
1245                                           _gtk_css_style_property_get_id (property),
1246                                           TRUE);
1247
1248   ruleset->owns_styles = TRUE;
1249
1250   for (i = 0; i < ruleset->n_styles; i++)
1251     {
1252       if (ruleset->styles[i].property == property)
1253         {
1254           _gtk_css_value_unref (ruleset->styles[i].value);
1255           ruleset->styles[i].value = NULL;
1256           if (ruleset->styles[i].section)
1257             gtk_css_section_unref (ruleset->styles[i].section);
1258           break;
1259         }
1260     }
1261   if (i == ruleset->n_styles)
1262     {
1263       ruleset->n_styles++;
1264       ruleset->styles = g_realloc (ruleset->styles, ruleset->n_styles * sizeof (PropertyValue));
1265       ruleset->styles[i].value = NULL;
1266       ruleset->styles[i].property = property;
1267     }
1268
1269   ruleset->styles[i].value = value;
1270   if (gtk_keep_css_sections)
1271     ruleset->styles[i].section = gtk_css_section_ref (section);
1272   else
1273     ruleset->styles[i].section = NULL;
1274 }
1275
1276 static void
1277 gtk_css_scanner_destroy (GtkCssScanner *scanner)
1278 {
1279   if (scanner->section)
1280     gtk_css_section_unref (scanner->section);
1281   g_object_unref (scanner->provider);
1282   _gtk_css_parser_free (scanner->parser);
1283
1284   g_slice_free (GtkCssScanner, scanner);
1285 }
1286
1287 static void
1288 gtk_css_provider_emit_error (GtkCssProvider *provider,
1289                              GtkCssScanner  *scanner,
1290                              const GError   *error)
1291 {
1292   g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
1293                  scanner != NULL ? scanner->section : NULL, error);
1294 }
1295
1296 static void
1297 gtk_css_scanner_parser_error (GtkCssParser *parser,
1298                               const GError *error,
1299                               gpointer      user_data)
1300 {
1301   GtkCssScanner *scanner = user_data;
1302
1303   gtk_css_provider_emit_error (scanner->provider,
1304                                scanner,
1305                                error);
1306 }
1307
1308 static GtkCssScanner *
1309 gtk_css_scanner_new (GtkCssProvider *provider,
1310                      GtkCssScanner  *parent,
1311                      GtkCssSection  *section,
1312                      GFile          *file,
1313                      const gchar    *text)
1314 {
1315   GtkCssScanner *scanner;
1316
1317   scanner = g_slice_new0 (GtkCssScanner);
1318
1319   g_object_ref (provider);
1320   scanner->provider = provider;
1321   scanner->parent = parent;
1322   if (section)
1323     scanner->section = gtk_css_section_ref (section);
1324
1325   scanner->parser = _gtk_css_parser_new (text,
1326                                          file,
1327                                          gtk_css_scanner_parser_error,
1328                                          scanner);
1329
1330   return scanner;
1331 }
1332
1333 static gboolean
1334 gtk_css_scanner_would_recurse (GtkCssScanner *scanner,
1335                                GFile         *file)
1336 {
1337   while (scanner)
1338     {
1339       GFile *parser_file = _gtk_css_parser_get_file (scanner->parser);
1340       if (parser_file && g_file_equal (parser_file, file))
1341         return TRUE;
1342
1343       scanner = scanner->parent;
1344     }
1345
1346   return FALSE;
1347 }
1348
1349 static void
1350 gtk_css_scanner_push_section (GtkCssScanner     *scanner,
1351                               GtkCssSectionType  section_type)
1352 {
1353   GtkCssSection *section;
1354
1355   section = _gtk_css_section_new (scanner->section,
1356                                   section_type,
1357                                   scanner->parser);
1358
1359   if (scanner->section)
1360     gtk_css_section_unref (scanner->section);
1361   scanner->section = section;
1362 }
1363
1364 static void
1365 gtk_css_scanner_pop_section (GtkCssScanner *scanner,
1366                              GtkCssSectionType check_type)
1367 {
1368   GtkCssSection *parent;
1369
1370   g_assert (gtk_css_section_get_section_type (scanner->section) == check_type);
1371
1372   parent = gtk_css_section_get_parent (scanner->section);
1373   if (parent)
1374     gtk_css_section_ref (parent);
1375
1376   _gtk_css_section_end (scanner->section);
1377   gtk_css_section_unref (scanner->section);
1378
1379   scanner->section = parent;
1380 }
1381
1382 static void
1383 gtk_css_provider_init (GtkCssProvider *css_provider)
1384 {
1385   GtkCssProviderPrivate *priv;
1386
1387   priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
1388                                                            GTK_TYPE_CSS_PROVIDER,
1389                                                            GtkCssProviderPrivate);
1390
1391   priv->rulesets = g_array_new (FALSE, FALSE, sizeof (GtkCssRuleset));
1392
1393   priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
1394                                                  (GDestroyNotify) g_free,
1395                                                  (GDestroyNotify) _gtk_css_value_unref);
1396   priv->keyframes = g_hash_table_new_full (g_str_hash, g_str_equal,
1397                                            (GDestroyNotify) g_free,
1398                                            (GDestroyNotify) _gtk_css_value_unref);
1399 }
1400
1401 static void
1402 verify_tree_match_results (GtkCssProvider *provider,
1403                            const GtkCssMatcher *matcher,
1404                            GPtrArray *tree_rules)
1405 {
1406 #ifdef VERIFY_TREE
1407   GtkCssProviderPrivate *priv = provider->priv;
1408   GtkCssRuleset *ruleset;
1409   gboolean should_match;
1410   int i, j;
1411
1412   for (i = 0; i < priv->rulesets->len; i++)
1413     {
1414       gboolean found = FALSE;
1415
1416       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
1417
1418       for (j = 0; j < tree_rules->len; j++)
1419         {
1420           if (ruleset == tree_rules->pdata[j])
1421             {
1422               found = TRUE;
1423               break;
1424             }
1425         }
1426       should_match = _gtk_css_selector_matches (ruleset->selector, matcher);
1427       if (found != !!should_match)
1428         {
1429           g_error ("expected rule '%s' to %s, but it %s\n",
1430                    _gtk_css_selector_to_string (ruleset->selector),
1431                    should_match ? "match" : "not match",
1432                    found ? "matched" : "didn't match");
1433         }
1434     }
1435 #endif
1436 }
1437
1438 static void
1439 verify_tree_get_change_results (GtkCssProvider *provider,
1440                                 const GtkCssMatcher *matcher,
1441                                 GtkCssChange change)
1442 {
1443 #ifdef VERIFY_TREE
1444   {
1445     GtkCssChange verify_change = 0;
1446     GPtrArray *tree_rules;
1447     int i;
1448
1449     tree_rules = _gtk_css_selector_tree_match_all (provider->priv->tree, matcher);
1450     verify_tree_match_results (provider, matcher, tree_rules);
1451
1452     for (i = tree_rules->len - 1; i >= 0; i--)
1453       {
1454         GtkCssRuleset *ruleset;
1455
1456         ruleset = tree_rules->pdata[i];
1457
1458         verify_change |= _gtk_css_selector_tree_match_get_change (ruleset->selector_match);
1459       }
1460
1461     if (change != verify_change)
1462       {
1463         GString *s;
1464
1465         s = g_string_new ("");
1466         g_string_append_printf (s, "expected change 0x%x, but it was 0x%x", verify_change, change);
1467         if ((change & ~verify_change) != 0)
1468           g_string_append_printf (s, ", unexpectedly set: 0x%x", change & ~verify_change);
1469         if ((~change & verify_change) != 0)
1470           g_string_append_printf (s, ", unexpectedly no set: 0x%x",  ~change & verify_change);
1471         g_warning (s->str);
1472         g_string_free (s, TRUE);
1473       }
1474
1475     g_ptr_array_free (tree_rules, TRUE);
1476   }
1477 #endif
1478 }
1479
1480
1481 static gboolean
1482 gtk_css_provider_get_style_property (GtkStyleProvider *provider,
1483                                      GtkWidgetPath    *path,
1484                                      GtkStateFlags     state,
1485                                      GParamSpec       *pspec,
1486                                      GValue           *value)
1487 {
1488   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1489   GtkCssProviderPrivate *priv = css_provider->priv;
1490   WidgetPropertyValue *val;
1491   GPtrArray *tree_rules;
1492   GtkCssMatcher matcher;
1493   gboolean found = FALSE;
1494   gchar *prop_name;
1495   gint i;
1496
1497   if (!_gtk_css_matcher_init (&matcher, path, state))
1498     return FALSE;
1499
1500   tree_rules = _gtk_css_selector_tree_match_all (priv->tree, &matcher);
1501   verify_tree_match_results (css_provider, &matcher, tree_rules);
1502
1503   prop_name = g_strdup_printf ("-%s-%s",
1504                                g_type_name (pspec->owner_type),
1505                                pspec->name);
1506
1507   for (i = tree_rules->len - 1; i >= 0; i--)
1508     {
1509       GtkCssRuleset *ruleset = tree_rules->pdata[i];
1510
1511       if (ruleset->widget_style == NULL)
1512         continue;
1513
1514       for (val = ruleset->widget_style; val != NULL; val = val->next)
1515         {
1516           if (strcmp (val->name, prop_name) == 0)
1517             {
1518               GtkCssScanner *scanner;
1519
1520               scanner = gtk_css_scanner_new (css_provider,
1521                                              NULL,
1522                                              val->section,
1523                                              val->section != NULL ? gtk_css_section_get_file (val->section) : NULL,
1524                                              val->value);
1525
1526               found = _gtk_css_style_parse_value (value,
1527                                                   scanner->parser);
1528
1529               gtk_css_scanner_destroy (scanner);
1530
1531               break;
1532             }
1533         }
1534
1535       if (found)
1536         break;
1537     }
1538
1539   g_free (prop_name);
1540   g_ptr_array_free (tree_rules, TRUE);
1541
1542   return found;
1543 }
1544
1545 static void
1546 gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
1547 {
1548   iface->get_style_property = gtk_css_provider_get_style_property;
1549 }
1550
1551 static GtkCssValue *
1552 gtk_css_style_provider_get_color (GtkStyleProviderPrivate *provider,
1553                                   const char              *name)
1554 {
1555   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1556
1557   return g_hash_table_lookup (css_provider->priv->symbolic_colors, name);
1558 }
1559
1560 static GtkCssKeyframes *
1561 gtk_css_style_provider_get_keyframes (GtkStyleProviderPrivate *provider,
1562                                       const char              *name)
1563 {
1564   GtkCssProvider *css_provider = GTK_CSS_PROVIDER (provider);
1565
1566   return g_hash_table_lookup (css_provider->priv->keyframes, name);
1567 }
1568
1569 static void
1570 gtk_css_style_provider_lookup (GtkStyleProviderPrivate *provider,
1571                                const GtkCssMatcher     *matcher,
1572                                GtkCssLookup            *lookup)
1573 {
1574   GtkCssProvider *css_provider;
1575   GtkCssProviderPrivate *priv;
1576   GtkCssRuleset *ruleset;
1577   guint j;
1578   int i;
1579   GPtrArray *tree_rules;
1580
1581   css_provider = GTK_CSS_PROVIDER (provider);
1582   priv = css_provider->priv;
1583
1584   tree_rules = _gtk_css_selector_tree_match_all (priv->tree, matcher);
1585   verify_tree_match_results (css_provider, matcher, tree_rules);
1586
1587   for (i = tree_rules->len - 1; i >= 0; i--)
1588     {
1589       ruleset = tree_rules->pdata[i];
1590
1591       if (ruleset->styles == NULL)
1592         continue;
1593
1594       if (!_gtk_bitmask_intersects (_gtk_css_lookup_get_missing (lookup),
1595                                     ruleset->set_styles))
1596         continue;
1597
1598       for (j = 0; j < ruleset->n_styles; j++)
1599         {
1600           GtkCssStyleProperty *prop = ruleset->styles[j].property;
1601           guint id = _gtk_css_style_property_get_id (prop);
1602
1603           if (!_gtk_css_lookup_is_missing (lookup, id))
1604             continue;
1605
1606           _gtk_css_lookup_set (lookup,
1607                                id,
1608                                ruleset->styles[j].section,
1609                                ruleset->styles[j].value);
1610         }
1611
1612       if (_gtk_bitmask_is_empty (_gtk_css_lookup_get_missing (lookup)))
1613         break;
1614     }
1615
1616   g_ptr_array_free (tree_rules, TRUE);
1617 }
1618
1619 static GtkCssChange
1620 gtk_css_style_provider_get_change (GtkStyleProviderPrivate *provider,
1621                                    const GtkCssMatcher     *matcher)
1622 {
1623   GtkCssProvider *css_provider;
1624   GtkCssProviderPrivate *priv;
1625   GtkCssChange change;
1626
1627   css_provider = GTK_CSS_PROVIDER (provider);
1628   priv = css_provider->priv;
1629
1630   change = _gtk_css_selector_tree_get_change_all (priv->tree, matcher);
1631
1632   verify_tree_get_change_results (css_provider, matcher, change);
1633
1634   return change;
1635 }
1636
1637 static void
1638 gtk_css_style_provider_private_iface_init (GtkStyleProviderPrivateInterface *iface)
1639 {
1640   iface->get_color = gtk_css_style_provider_get_color;
1641   iface->get_keyframes = gtk_css_style_provider_get_keyframes;
1642   iface->lookup = gtk_css_style_provider_lookup;
1643   iface->get_change = gtk_css_style_provider_get_change;
1644 }
1645
1646 static void
1647 gtk_css_provider_finalize (GObject *object)
1648 {
1649   GtkCssProvider *css_provider;
1650   GtkCssProviderPrivate *priv;
1651   guint i;
1652
1653   css_provider = GTK_CSS_PROVIDER (object);
1654   priv = css_provider->priv;
1655
1656   for (i = 0; i < priv->rulesets->len; i++)
1657     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1658
1659   g_array_free (priv->rulesets, TRUE);
1660   _gtk_css_selector_tree_free (priv->tree);
1661
1662   g_hash_table_destroy (priv->symbolic_colors);
1663   g_hash_table_destroy (priv->keyframes);
1664
1665   if (priv->resource)
1666     {
1667       g_resources_unregister (priv->resource);
1668       g_resource_unref (priv->resource);
1669       priv->resource = NULL;
1670     }
1671
1672   G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
1673 }
1674
1675 /**
1676  * gtk_css_provider_new:
1677  *
1678  * Returns a newly created #GtkCssProvider.
1679  *
1680  * Returns: A new #GtkCssProvider
1681  **/
1682 GtkCssProvider *
1683 gtk_css_provider_new (void)
1684 {
1685   return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
1686 }
1687
1688 static void
1689 gtk_css_provider_take_error (GtkCssProvider *provider,
1690                              GtkCssScanner  *scanner,
1691                              GError         *error)
1692 {
1693   gtk_css_provider_emit_error (provider,
1694                                scanner,
1695                                error);
1696
1697   g_error_free (error);
1698 }
1699
1700 static void
1701 gtk_css_provider_error_literal (GtkCssProvider *provider,
1702                                 GtkCssScanner  *scanner,
1703                                 GQuark          domain,
1704                                 gint            code,
1705                                 const char     *message)
1706 {
1707   gtk_css_provider_take_error (provider,
1708                                scanner,
1709                                g_error_new_literal (domain, code, message));
1710 }
1711
1712 static void
1713 gtk_css_provider_error (GtkCssProvider *provider,
1714                         GtkCssScanner  *scanner,
1715                         GQuark          domain,
1716                         gint            code,
1717                         const char     *format,
1718                         ...)  G_GNUC_PRINTF (5, 6);
1719 static void
1720 gtk_css_provider_error (GtkCssProvider *provider,
1721                         GtkCssScanner  *scanner,
1722                         GQuark          domain,
1723                         gint            code,
1724                         const char     *format,
1725                         ...)
1726 {
1727   GError *error;
1728   va_list args;
1729
1730   va_start (args, format);
1731   error = g_error_new_valist (domain, code, format, args);
1732   va_end (args);
1733
1734   gtk_css_provider_take_error (provider, scanner, error);
1735 }
1736
1737 static void
1738 gtk_css_provider_invalid_token (GtkCssProvider *provider,
1739                                 GtkCssScanner  *scanner,
1740                                 const char     *expected)
1741 {
1742   gtk_css_provider_error (provider,
1743                           scanner,
1744                           GTK_CSS_PROVIDER_ERROR,
1745                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
1746                           "expected a valid %s", expected);
1747 }
1748
1749 static void
1750 css_provider_commit (GtkCssProvider *css_provider,
1751                      GSList         *selectors,
1752                      GtkCssRuleset  *ruleset)
1753 {
1754   GtkCssProviderPrivate *priv;
1755   GSList *l;
1756
1757   priv = css_provider->priv;
1758
1759   if (ruleset->styles == NULL && ruleset->widget_style == NULL)
1760     {
1761       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
1762       return;
1763     }
1764
1765   for (l = selectors; l; l = l->next)
1766     {
1767       GtkCssRuleset new;
1768
1769       gtk_css_ruleset_init_copy (&new, ruleset, l->data);
1770
1771       g_array_append_val (priv->rulesets, new);
1772     }
1773
1774   g_slist_free (selectors);
1775 }
1776
1777 static void
1778 gtk_css_provider_reset (GtkCssProvider *css_provider)
1779 {
1780   GtkCssProviderPrivate *priv;
1781   guint i;
1782
1783   priv = css_provider->priv;
1784
1785   if (priv->resource)
1786     {
1787       g_resources_unregister (priv->resource);
1788       g_resource_unref (priv->resource);
1789       priv->resource = NULL;
1790     }
1791
1792   g_hash_table_remove_all (priv->symbolic_colors);
1793   g_hash_table_remove_all (priv->keyframes);
1794
1795   for (i = 0; i < priv->rulesets->len; i++)
1796     gtk_css_ruleset_clear (&g_array_index (priv->rulesets, GtkCssRuleset, i));
1797   g_array_set_size (priv->rulesets, 0);
1798   _gtk_css_selector_tree_free (priv->tree);
1799   priv->tree = NULL;
1800
1801 }
1802
1803 static void
1804 gtk_css_provider_propagate_error (GtkCssProvider  *provider,
1805                                   GtkCssSection   *section,
1806                                   const GError    *error,
1807                                   GError         **propagate_to)
1808 {
1809
1810   char *s;
1811
1812   /* don't fail for deprecations */
1813   if (g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
1814     {
1815       s = _gtk_css_section_to_string (section);
1816       g_warning ("Theme parsing error: %s: %s", s, error->message);
1817       g_free (s);
1818       return;
1819     }
1820
1821   /* we already set an error. And we'd like to keep the first one */
1822   if (*propagate_to)
1823     return;
1824
1825   *propagate_to = g_error_copy (error);
1826   if (section)
1827     {
1828       s = _gtk_css_section_to_string (section);
1829       g_prefix_error (propagate_to, "%s", s);
1830       g_free (s);
1831     }
1832 }
1833
1834 static gboolean
1835 parse_import (GtkCssScanner *scanner)
1836 {
1837   GFile *file;
1838
1839   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_IMPORT);
1840
1841   if (!_gtk_css_parser_try (scanner->parser, "@import", TRUE))
1842     {
1843       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1844       return FALSE;
1845     }
1846
1847   if (_gtk_css_parser_is_string (scanner->parser))
1848     {
1849       char *uri;
1850
1851       uri = _gtk_css_parser_read_string (scanner->parser);
1852       file = _gtk_css_parser_get_file_for_path (scanner->parser, uri);
1853       g_free (uri);
1854     }
1855   else
1856     {
1857       file = _gtk_css_parser_read_url (scanner->parser);
1858     }
1859
1860   if (file == NULL)
1861     {
1862       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1863       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1864       return TRUE;
1865     }
1866
1867   if (!_gtk_css_parser_try (scanner->parser, ";", FALSE))
1868     {
1869       gtk_css_provider_invalid_token (scanner->provider, scanner, "semicolon");
1870       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1871     }
1872   else if (gtk_css_scanner_would_recurse (scanner, file))
1873     {
1874        char *path = g_file_get_path (file);
1875        gtk_css_provider_error (scanner->provider,
1876                                scanner,
1877                                GTK_CSS_PROVIDER_ERROR,
1878                                GTK_CSS_PROVIDER_ERROR_IMPORT,
1879                                "Loading '%s' would recurse",
1880                                path);
1881        g_free (path);
1882     }
1883   else
1884     {
1885       gtk_css_provider_load_internal (scanner->provider,
1886                                       scanner,
1887                                       file,
1888                                       NULL,
1889                                       NULL);
1890     }
1891
1892   g_object_unref (file);
1893
1894   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_IMPORT);
1895   _gtk_css_parser_skip_whitespace (scanner->parser);
1896
1897   return TRUE;
1898 }
1899
1900 static gboolean
1901 parse_color_definition (GtkCssScanner *scanner)
1902 {
1903   GtkCssValue *color;
1904   char *name;
1905
1906   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1907
1908   if (!_gtk_css_parser_try (scanner->parser, "@define-color", TRUE))
1909     {
1910       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1911       return FALSE;
1912     }
1913
1914   name = _gtk_css_parser_try_name (scanner->parser, TRUE);
1915   if (name == NULL)
1916     {
1917       gtk_css_provider_error_literal (scanner->provider,
1918                                       scanner,
1919                                       GTK_CSS_PROVIDER_ERROR,
1920                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1921                                       "Not a valid color name");
1922       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1923       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1924       return TRUE;
1925     }
1926
1927   color = _gtk_css_color_value_parse (scanner->parser);
1928   if (color == NULL)
1929     {
1930       g_free (name);
1931       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1932       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1933       return TRUE;
1934     }
1935
1936   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
1937     {
1938       g_free (name);
1939       _gtk_css_value_unref (color);
1940       gtk_css_provider_error_literal (scanner->provider,
1941                                       scanner,
1942                                       GTK_CSS_PROVIDER_ERROR,
1943                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1944                                       "Missing semicolon at end of color definition");
1945       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1946
1947       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1948       return TRUE;
1949     }
1950
1951   g_hash_table_insert (scanner->provider->priv->symbolic_colors, name, color);
1952
1953   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_COLOR_DEFINITION);
1954   return TRUE;
1955 }
1956
1957 static gboolean
1958 parse_binding_set (GtkCssScanner *scanner)
1959 {
1960   GtkBindingSet *binding_set;
1961   char *name;
1962
1963   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1964
1965   if (!_gtk_css_parser_try (scanner->parser, "@binding-set", TRUE))
1966     {
1967       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
1968       return FALSE;
1969     }
1970
1971   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
1972   if (name == NULL)
1973     {
1974       gtk_css_provider_error_literal (scanner->provider,
1975                                       scanner,
1976                                       GTK_CSS_PROVIDER_ERROR,
1977                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1978                                       "Expected name for binding set");
1979       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1980       goto skip_semicolon;
1981     }
1982
1983   binding_set = gtk_binding_set_find (name);
1984   if (!binding_set)
1985     {
1986       binding_set = gtk_binding_set_new (name);
1987       binding_set->parsed = TRUE;
1988     }
1989   g_free (name);
1990
1991   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
1992     {
1993       gtk_css_provider_error_literal (scanner->provider,
1994                                       scanner,
1995                                       GTK_CSS_PROVIDER_ERROR,
1996                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
1997                                       "Expected '{' for binding set");
1998       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
1999       goto skip_semicolon;
2000     }
2001
2002   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2003          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2004     {
2005       name = _gtk_css_parser_read_value (scanner->parser);
2006       if (name == NULL)
2007         {
2008           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2009           continue;
2010         }
2011
2012       if (gtk_binding_entry_add_signal_from_string (binding_set, name) != G_TOKEN_NONE)
2013         {
2014           gtk_css_provider_error_literal (scanner->provider,
2015                                           scanner,
2016                                           GTK_CSS_PROVIDER_ERROR,
2017                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2018                                           "Failed to parse binding set.");
2019         }
2020
2021       g_free (name);
2022
2023       if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2024         {
2025           if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2026               !_gtk_css_parser_is_eof (scanner->parser))
2027             {
2028               gtk_css_provider_error_literal (scanner->provider,
2029                                               scanner,
2030                                               GTK_CSS_PROVIDER_ERROR,
2031                                               GTK_CSS_PROVIDER_ERROR_SYNTAX,
2032                                               "Expected semicolon");
2033               _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2034             }
2035         }
2036     }
2037
2038   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2039     {
2040       gtk_css_provider_error_literal (scanner->provider,
2041                                       scanner,
2042                                       GTK_CSS_PROVIDER_ERROR,
2043                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2044                                       "expected '}' after declarations");
2045       if (!_gtk_css_parser_is_eof (scanner->parser))
2046         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2047     }
2048
2049 skip_semicolon:
2050   if (_gtk_css_parser_begins_with (scanner->parser, ';'))
2051     {
2052       gtk_css_provider_error_literal (scanner->provider,
2053                                       scanner,
2054                                       GTK_CSS_PROVIDER_ERROR,
2055                                       GTK_CSS_PROVIDER_ERROR_DEPRECATED,
2056                                       "Nonstandard semicolon at end of binding set");
2057       _gtk_css_parser_try (scanner->parser, ";", TRUE);
2058     }
2059
2060   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_BINDING_SET);
2061
2062   return TRUE;
2063 }
2064
2065 static gboolean
2066 parse_keyframes (GtkCssScanner *scanner)
2067 {
2068   GtkCssKeyframes *keyframes;
2069   char *name;
2070
2071   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_KEYFRAMES);
2072
2073   if (!_gtk_css_parser_try (scanner->parser, "@keyframes", TRUE))
2074     {
2075       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_KEYFRAMES);
2076       return FALSE;
2077     }
2078
2079   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2080   if (name == NULL)
2081     {
2082       gtk_css_provider_error_literal (scanner->provider,
2083                                       scanner,
2084                                       GTK_CSS_PROVIDER_ERROR,
2085                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2086                                       "Expected name for keyframes");
2087       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2088       goto exit;
2089     }
2090
2091   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2092     {
2093       gtk_css_provider_error_literal (scanner->provider,
2094                                       scanner,
2095                                       GTK_CSS_PROVIDER_ERROR,
2096                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2097                                       "Expected '{' for keyframes");
2098       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2099       g_free (name);
2100       goto exit;
2101     }
2102
2103   keyframes = _gtk_css_keyframes_parse (scanner->parser);
2104   if (keyframes == NULL)
2105     {
2106       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2107       g_free (name);
2108       goto exit;
2109     }
2110
2111   g_hash_table_insert (scanner->provider->priv->keyframes, name, keyframes);
2112
2113   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2114     {
2115       gtk_css_provider_error_literal (scanner->provider,
2116                                       scanner,
2117                                       GTK_CSS_PROVIDER_ERROR,
2118                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2119                                       "expected '}' after declarations");
2120       if (!_gtk_css_parser_is_eof (scanner->parser))
2121         _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2122     }
2123
2124 exit:
2125   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_KEYFRAMES);
2126
2127   return TRUE;
2128 }
2129
2130 static void
2131 parse_at_keyword (GtkCssScanner *scanner)
2132 {
2133   if (parse_import (scanner))
2134     return;
2135   if (parse_color_definition (scanner))
2136     return;
2137   if (parse_binding_set (scanner))
2138     return;
2139   if (parse_keyframes (scanner))
2140     return;
2141
2142   else
2143     {
2144       gtk_css_provider_error_literal (scanner->provider,
2145                                       scanner,
2146                                       GTK_CSS_PROVIDER_ERROR,
2147                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2148                                       "unknown @ rule");
2149       _gtk_css_parser_resync (scanner->parser, TRUE, 0);
2150     }
2151 }
2152
2153 static GSList *
2154 parse_selector_list (GtkCssScanner *scanner)
2155 {
2156   GSList *selectors = NULL;
2157
2158   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_SELECTOR);
2159
2160   do {
2161       GtkCssSelector *select = _gtk_css_selector_parse (scanner->parser);
2162
2163       if (select == NULL)
2164         {
2165           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2166           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2167           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2168           return NULL;
2169         }
2170
2171       selectors = g_slist_prepend (selectors, select);
2172     }
2173   while (_gtk_css_parser_try (scanner->parser, ",", TRUE));
2174
2175   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_SELECTOR);
2176
2177   return selectors;
2178 }
2179
2180 static void
2181 parse_declaration (GtkCssScanner *scanner,
2182                    GtkCssRuleset *ruleset)
2183 {
2184   GtkStyleProperty *property;
2185   char *name;
2186
2187   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DECLARATION);
2188
2189   name = _gtk_css_parser_try_ident (scanner->parser, TRUE);
2190   if (name == NULL)
2191     goto check_for_semicolon;
2192
2193   property = _gtk_style_property_lookup (name);
2194   if (property == NULL && name[0] != '-')
2195     {
2196       gtk_css_provider_error (scanner->provider,
2197                               scanner,
2198                               GTK_CSS_PROVIDER_ERROR,
2199                               GTK_CSS_PROVIDER_ERROR_NAME,
2200                               "'%s' is not a valid property name",
2201                               name);
2202       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2203       g_free (name);
2204       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2205       return;
2206     }
2207
2208   if (!_gtk_css_parser_try (scanner->parser, ":", TRUE))
2209     {
2210       gtk_css_provider_invalid_token (scanner->provider, scanner, "':'");
2211       _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2212       g_free (name);
2213       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2214       return;
2215     }
2216
2217   if (property)
2218     {
2219       GtkCssValue *value;
2220
2221       g_free (name);
2222
2223       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2224
2225       value = _gtk_style_property_parse_value (property,
2226                                                scanner->parser);
2227
2228       if (value == NULL)
2229         {
2230           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2231           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2232           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2233           return;
2234         }
2235
2236       if (!_gtk_css_parser_begins_with (scanner->parser, ';') &&
2237           !_gtk_css_parser_begins_with (scanner->parser, '}') &&
2238           !_gtk_css_parser_is_eof (scanner->parser))
2239         {
2240           gtk_css_provider_error_literal (scanner->provider,
2241                                           scanner,
2242                                           GTK_CSS_PROVIDER_ERROR,
2243                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2244                                           "Junk at end of value");
2245           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2246           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2247           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2248           return;
2249         }
2250
2251       if (GTK_IS_CSS_SHORTHAND_PROPERTY (property))
2252         {
2253           GtkCssShorthandProperty *shorthand = GTK_CSS_SHORTHAND_PROPERTY (property);
2254           guint i;
2255
2256           for (i = 0; i < _gtk_css_shorthand_property_get_n_subproperties (shorthand); i++)
2257             {
2258               GtkCssStyleProperty *child = _gtk_css_shorthand_property_get_subproperty (shorthand, i);
2259               GtkCssValue *sub = _gtk_css_array_value_get_nth (value, i);
2260
2261               gtk_css_ruleset_add (ruleset, child, _gtk_css_value_ref (sub), scanner->section);
2262             }
2263
2264             _gtk_css_value_unref (value);
2265         }
2266       else if (GTK_IS_CSS_STYLE_PROPERTY (property))
2267         {
2268           gtk_css_ruleset_add (ruleset, GTK_CSS_STYLE_PROPERTY (property), value, scanner->section);
2269         }
2270       else
2271         {
2272           g_assert_not_reached ();
2273           _gtk_css_value_unref (value);
2274         }
2275
2276
2277       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2278     }
2279   else if (name[0] == '-')
2280     {
2281       char *value_str;
2282
2283       gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_VALUE);
2284
2285       value_str = _gtk_css_parser_read_value (scanner->parser);
2286       if (value_str)
2287         {
2288           WidgetPropertyValue *val;
2289
2290           val = widget_property_value_new (name, scanner->section);
2291           val->value = value_str;
2292
2293           gtk_css_ruleset_add_style (ruleset, name, val);
2294         }
2295       else
2296         {
2297           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2298           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2299           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2300           return;
2301         }
2302
2303       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_VALUE);
2304     }
2305   else
2306     g_free (name);
2307
2308 check_for_semicolon:
2309   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DECLARATION);
2310
2311   if (!_gtk_css_parser_try (scanner->parser, ";", TRUE))
2312     {
2313       if (!_gtk_css_parser_begins_with (scanner->parser, '}') &&
2314           !_gtk_css_parser_is_eof (scanner->parser))
2315         {
2316           gtk_css_provider_error_literal (scanner->provider,
2317                                           scanner,
2318                                           GTK_CSS_PROVIDER_ERROR,
2319                                           GTK_CSS_PROVIDER_ERROR_SYNTAX,
2320                                           "Expected semicolon");
2321           _gtk_css_parser_resync (scanner->parser, TRUE, '}');
2322         }
2323     }
2324 }
2325
2326 static void
2327 parse_declarations (GtkCssScanner *scanner,
2328                     GtkCssRuleset *ruleset)
2329 {
2330   while (!_gtk_css_parser_is_eof (scanner->parser) &&
2331          !_gtk_css_parser_begins_with (scanner->parser, '}'))
2332     {
2333       parse_declaration (scanner, ruleset);
2334     }
2335 }
2336
2337 static void
2338 parse_ruleset (GtkCssScanner *scanner)
2339 {
2340   GSList *selectors;
2341   GtkCssRuleset ruleset = { 0, };
2342
2343   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_RULESET);
2344
2345   selectors = parse_selector_list (scanner);
2346   if (selectors == NULL)
2347     {
2348       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2349       return;
2350     }
2351
2352   if (!_gtk_css_parser_try (scanner->parser, "{", TRUE))
2353     {
2354       gtk_css_provider_error_literal (scanner->provider,
2355                                       scanner,
2356                                       GTK_CSS_PROVIDER_ERROR,
2357                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2358                                       "expected '{' after selectors");
2359       _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2360       g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2361       gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2362       return;
2363     }
2364
2365   parse_declarations (scanner, &ruleset);
2366
2367   if (!_gtk_css_parser_try (scanner->parser, "}", TRUE))
2368     {
2369       gtk_css_provider_error_literal (scanner->provider,
2370                                       scanner,
2371                                       GTK_CSS_PROVIDER_ERROR,
2372                                       GTK_CSS_PROVIDER_ERROR_SYNTAX,
2373                                       "expected '}' after declarations");
2374       if (!_gtk_css_parser_is_eof (scanner->parser))
2375         {
2376           _gtk_css_parser_resync (scanner->parser, FALSE, 0);
2377           g_slist_free_full (selectors, (GDestroyNotify) _gtk_css_selector_free);
2378           gtk_css_ruleset_clear (&ruleset);
2379           gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2380         }
2381     }
2382
2383   css_provider_commit (scanner->provider, selectors, &ruleset);
2384   gtk_css_ruleset_clear (&ruleset);
2385   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_RULESET);
2386 }
2387
2388 static void
2389 parse_statement (GtkCssScanner *scanner)
2390 {
2391   if (_gtk_css_parser_begins_with (scanner->parser, '@'))
2392     parse_at_keyword (scanner);
2393   else
2394     parse_ruleset (scanner);
2395 }
2396
2397 static void
2398 parse_stylesheet (GtkCssScanner *scanner)
2399 {
2400   gtk_css_scanner_push_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2401
2402   _gtk_css_parser_skip_whitespace (scanner->parser);
2403
2404   while (!_gtk_css_parser_is_eof (scanner->parser))
2405     {
2406       if (_gtk_css_parser_try (scanner->parser, "<!--", TRUE) ||
2407           _gtk_css_parser_try (scanner->parser, "-->", TRUE))
2408         continue;
2409
2410       parse_statement (scanner);
2411     }
2412
2413   gtk_css_scanner_pop_section (scanner, GTK_CSS_SECTION_DOCUMENT);
2414 }
2415
2416 static int
2417 gtk_css_provider_compare_rule (gconstpointer a_,
2418                                gconstpointer b_)
2419 {
2420   const GtkCssRuleset *a = (const GtkCssRuleset *) a_;
2421   const GtkCssRuleset *b = (const GtkCssRuleset *) b_;
2422   int compare;
2423
2424   compare = _gtk_css_selector_compare (a->selector, b->selector);
2425   if (compare != 0)
2426     return compare;
2427
2428   return 0;
2429 }
2430
2431 static void
2432 gtk_css_provider_postprocess (GtkCssProvider *css_provider)
2433 {
2434   GtkCssProviderPrivate *priv = css_provider->priv;
2435   GtkCssSelectorTreeBuilder *builder;
2436   guint i;
2437
2438   g_array_sort (priv->rulesets, gtk_css_provider_compare_rule);
2439
2440   builder = _gtk_css_selector_tree_builder_new ();
2441   for (i = 0; i < priv->rulesets->len; i++)
2442     {
2443       GtkCssRuleset *ruleset;
2444
2445       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
2446
2447       _gtk_css_selector_tree_builder_add (builder,
2448                                           ruleset->selector,
2449                                           &ruleset->selector_match,
2450                                           ruleset);
2451     }
2452
2453   priv->tree = _gtk_css_selector_tree_builder_build (builder);
2454   _gtk_css_selector_tree_builder_free (builder);
2455
2456 #ifndef VERIFY_TREE
2457   for (i = 0; i < priv->rulesets->len; i++)
2458     {
2459       GtkCssRuleset *ruleset;
2460
2461       ruleset = &g_array_index (priv->rulesets, GtkCssRuleset, i);
2462
2463       _gtk_css_selector_free (ruleset->selector);
2464       ruleset->selector = NULL;
2465     }
2466 #endif
2467 }
2468
2469 static gboolean
2470 gtk_css_provider_load_internal (GtkCssProvider *css_provider,
2471                                 GtkCssScanner  *parent,
2472                                 GFile          *file,
2473                                 const char     *text,
2474                                 GError        **error)
2475 {
2476   GtkCssScanner *scanner;
2477   gulong error_handler;
2478   char *free_data = NULL;
2479
2480   if (error)
2481     error_handler = g_signal_connect (css_provider,
2482                                       "parsing-error",
2483                                       G_CALLBACK (gtk_css_provider_propagate_error),
2484                                       error);
2485   else
2486     error_handler = 0; /* silence gcc */
2487
2488   if (text == NULL)
2489     {
2490       GError *load_error = NULL;
2491
2492       if (g_file_load_contents (file, NULL,
2493                                 &free_data, NULL,
2494                                 NULL, &load_error))
2495         {
2496           text = free_data;
2497         }
2498       else
2499         {
2500           GtkCssSection *section;
2501
2502           if (parent)
2503             section = gtk_css_section_ref (parent->section);
2504           else
2505             section = _gtk_css_section_new_for_file (GTK_CSS_SECTION_DOCUMENT, file);
2506
2507           gtk_css_provider_error (css_provider,
2508                                   parent,
2509                                   GTK_CSS_PROVIDER_ERROR,
2510                                   GTK_CSS_PROVIDER_ERROR_IMPORT,
2511                                   "Failed to import: %s",
2512                                   load_error->message);
2513
2514           gtk_css_section_unref (section);
2515         }
2516     }
2517
2518   if (text)
2519     {
2520       scanner = gtk_css_scanner_new (css_provider,
2521                                      parent,
2522                                      parent ? parent->section : NULL,
2523                                      file,
2524                                      text);
2525
2526       parse_stylesheet (scanner);
2527
2528       gtk_css_scanner_destroy (scanner);
2529
2530       if (parent == NULL)
2531         gtk_css_provider_postprocess (css_provider);
2532     }
2533
2534   g_free (free_data);
2535
2536   if (error)
2537     {
2538       g_signal_handler_disconnect (css_provider, error_handler);
2539
2540       if (*error)
2541         {
2542           /* We clear all contents from the provider for backwards compat reasons */
2543           gtk_css_provider_reset (css_provider);
2544           return FALSE;
2545         }
2546     }
2547
2548   return TRUE;
2549 }
2550
2551 /**
2552  * gtk_css_provider_load_from_data:
2553  * @css_provider: a #GtkCssProvider
2554  * @data: (array length=length) (element-type guint8): CSS data loaded in memory
2555  * @length: the length of @data in bytes, or -1 for NUL terminated strings. If
2556  *   @length is not -1, the code will assume it is not NUL terminated and will
2557  *   potentially do a copy.
2558  * @error: (out) (allow-none): return location for a #GError, or %NULL
2559  *
2560  * Loads @data into @css_provider, making it clear any previously loaded
2561  * information.
2562  *
2563  * Returns: %TRUE. The return value is deprecated and %FALSE will only be
2564  *     returned for backwards compatibility reasons if an @error is not
2565  *     %NULL and a loading error occured. To track errors while loading
2566  *     CSS, connect to the GtkCssProvider::parsing-error signal.
2567  **/
2568 gboolean
2569 gtk_css_provider_load_from_data (GtkCssProvider  *css_provider,
2570                                  const gchar     *data,
2571                                  gssize           length,
2572                                  GError         **error)
2573 {
2574   char *free_data;
2575   gboolean ret;
2576
2577   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2578   g_return_val_if_fail (data != NULL, FALSE);
2579
2580   if (length < 0)
2581     {
2582       length = strlen (data);
2583       free_data = NULL;
2584     }
2585   else
2586     {
2587       free_data = g_strndup (data, length);
2588       data = free_data;
2589     }
2590
2591   gtk_css_provider_reset (css_provider);
2592
2593   ret = gtk_css_provider_load_internal (css_provider, NULL, NULL, data, error);
2594
2595   g_free (free_data);
2596
2597   _gtk_style_provider_private_changed (GTK_STYLE_PROVIDER_PRIVATE (css_provider));
2598
2599   return ret;
2600 }
2601
2602 /**
2603  * gtk_css_provider_load_from_file:
2604  * @css_provider: a #GtkCssProvider
2605  * @file: #GFile pointing to a file to load
2606  * @error: (out) (allow-none): return location for a #GError, or %NULL
2607  *
2608  * Loads the data contained in @file into @css_provider, making it
2609  * clear any previously loaded information.
2610  *
2611  * Returns: %TRUE. The return value is deprecated and %FALSE will only be
2612  *     returned for backwards compatibility reasons if an @error is not
2613  *     %NULL and a loading error occured. To track errors while loading
2614  *     CSS, connect to the GtkCssProvider::parsing-error signal.
2615  **/
2616 gboolean
2617 gtk_css_provider_load_from_file (GtkCssProvider  *css_provider,
2618                                  GFile           *file,
2619                                  GError         **error)
2620 {
2621   gboolean success;
2622
2623   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2624   g_return_val_if_fail (G_IS_FILE (file), FALSE);
2625
2626   gtk_css_provider_reset (css_provider);
2627
2628   success = gtk_css_provider_load_internal (css_provider, NULL, file, NULL, error);
2629
2630   _gtk_style_provider_private_changed (GTK_STYLE_PROVIDER_PRIVATE (css_provider));
2631
2632   return success;
2633 }
2634
2635 /**
2636  * gtk_css_provider_load_from_path:
2637  * @css_provider: a #GtkCssProvider
2638  * @path: the path of a filename to load, in the GLib filename encoding
2639  * @error: (out) (allow-none): return location for a #GError, or %NULL
2640  *
2641  * Loads the data contained in @path into @css_provider, making it clear
2642  * any previously loaded information.
2643  *
2644  * Returns: %TRUE. The return value is deprecated and %FALSE will only be
2645  *     returned for backwards compatibility reasons if an @error is not
2646  *     %NULL and a loading error occured. To track errors while loading
2647  *     CSS, connect to the GtkCssProvider::parsing-error signal.
2648  **/
2649 gboolean
2650 gtk_css_provider_load_from_path (GtkCssProvider  *css_provider,
2651                                  const gchar     *path,
2652                                  GError         **error)
2653 {
2654   GFile *file;
2655   gboolean result;
2656
2657   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
2658   g_return_val_if_fail (path != NULL, FALSE);
2659
2660   file = g_file_new_for_path (path);
2661
2662   result = gtk_css_provider_load_from_file (css_provider, file, error);
2663
2664   g_object_unref (file);
2665
2666   return result;
2667 }
2668
2669 static void
2670 gtk_css_provider_load_from_resource (GtkCssProvider  *css_provider,
2671                                      const gchar     *resource_path)
2672 {
2673   GFile *file;
2674   char *uri, *escaped;
2675
2676   g_return_if_fail (GTK_IS_CSS_PROVIDER (css_provider));
2677   g_return_if_fail (resource_path != NULL);
2678
2679   escaped = g_uri_escape_string (resource_path,
2680                                  G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, FALSE);
2681   uri = g_strconcat ("resource://", escaped, NULL);
2682   g_free (escaped);
2683
2684   file = g_file_new_for_uri (uri);
2685   g_free (uri);
2686
2687   gtk_css_provider_load_from_file (css_provider, file, NULL);
2688
2689   g_object_unref (file);
2690 }
2691
2692 /**
2693  * gtk_css_provider_get_default:
2694  *
2695  * Returns the provider containing the style settings used as a
2696  * fallback for all widgets.
2697  *
2698  * Returns: (transfer none): The provider used for fallback styling.
2699  *          This memory is owned by GTK+, and you must not free it.
2700  **/
2701 GtkCssProvider *
2702 gtk_css_provider_get_default (void)
2703 {
2704   static GtkCssProvider *provider;
2705
2706   if (G_UNLIKELY (!provider))
2707     {
2708       provider = gtk_css_provider_new ();
2709     }
2710
2711   return provider;
2712 }
2713
2714 gchar *
2715 _gtk_css_provider_get_theme_dir (void)
2716 {
2717   const gchar *var;
2718   gchar *path;
2719
2720   var = g_getenv ("GTK_DATA_PREFIX");
2721
2722   if (var)
2723     path = g_build_filename (var, "share", "themes", NULL);
2724   else
2725     path = g_build_filename (_gtk_get_data_prefix (), "share", "themes", NULL);
2726
2727   return path;
2728 }
2729
2730 /**
2731  * _gtk_css_provider_load_named:
2732  * @provider: a #GtkCssProvider
2733  * @name: A theme name
2734  * @variant: (allow-none): variant to load, for example, "dark", or
2735  *     %NULL for the default
2736  *
2737  * Loads a theme from the usual theme paths. The actual process of
2738  * finding the theme might change between releases, but it is
2739  * guaranteed that this function uses the same mechanism to load the
2740  * theme than GTK uses for loading its own theme.
2741  **/
2742 void
2743 _gtk_css_provider_load_named (GtkCssProvider *provider,
2744                               const gchar    *name,
2745                               const gchar    *variant)
2746 {
2747   gchar *subpath, *path;
2748   gchar *resource_path;
2749
2750   g_return_if_fail (GTK_IS_CSS_PROVIDER (provider));
2751   g_return_if_fail (name != NULL);
2752
2753   gtk_css_provider_reset (provider);
2754
2755   /* try loading the resource for the theme. This is mostly meant for built-in
2756    * themes.
2757    */
2758   if (variant)
2759     resource_path = g_strdup_printf ("/org/gtk/libgtk/%s-%s.css", name, variant);
2760   else
2761     resource_path = g_strdup_printf ("/org/gtk/libgtk/%s.css", name);
2762
2763   if (g_resources_get_info (resource_path, 0, NULL, NULL, NULL))
2764     {
2765       gtk_css_provider_load_from_resource (provider, resource_path);
2766       g_free (resource_path);
2767       return;
2768     }
2769   g_free (resource_path);
2770
2771
2772   /* Next try looking for files in the various theme directories.
2773    */
2774   if (variant)
2775     subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
2776   else
2777     subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
2778
2779   /* First look in the user's config directory
2780    */
2781   path = g_build_filename (g_get_user_data_dir (), "themes", name, subpath, NULL);
2782   if (!g_file_test (path, G_FILE_TEST_EXISTS))
2783     {
2784       g_free (path);
2785       /* Next look in the user's home directory
2786        */
2787       path = g_build_filename (g_get_home_dir (), ".themes", name, subpath, NULL);
2788       if (!g_file_test (path, G_FILE_TEST_EXISTS))
2789         {
2790           gchar *theme_dir;
2791
2792           g_free (path);
2793
2794           /* Finally, try in the default theme directory */
2795           theme_dir = _gtk_css_provider_get_theme_dir ();
2796           path = g_build_filename (theme_dir, name, subpath, NULL);
2797           g_free (theme_dir);
2798
2799           if (!g_file_test (path, G_FILE_TEST_EXISTS))
2800             {
2801               g_free (path);
2802               path = NULL;
2803             }
2804         }
2805     }
2806
2807   g_free (subpath);
2808
2809   if (path)
2810     {
2811       char *dir, *resource_file;
2812       GResource *resource;
2813
2814       dir = g_path_get_dirname (path);
2815       resource_file = g_build_filename (dir, "gtk.gresource", NULL);
2816       resource = g_resource_load (resource_file, NULL);
2817       g_free (resource_file);
2818
2819       if (resource != NULL)
2820         g_resources_register (resource);
2821
2822       gtk_css_provider_load_from_path (provider, path, NULL);
2823
2824       /* Only set this after load, as load_from_path will clear it */
2825       provider->priv->resource = resource;
2826
2827       g_free (path);
2828       g_free (dir);
2829     }
2830   else
2831     {
2832       /* Things failed! Fall back! Fall back! */
2833
2834       if (variant)
2835         {
2836           /* If there was a variant, try without */
2837           _gtk_css_provider_load_named (provider, name, NULL);
2838         }
2839       else
2840         {
2841           /* Worst case, fall back to Raleigh */
2842           g_return_if_fail (!g_str_equal (name, "Raleigh")); /* infloop protection */
2843           _gtk_css_provider_load_named (provider, "Raleigh", NULL);
2844         }
2845     }
2846 }
2847
2848 /**
2849  * gtk_css_provider_get_named:
2850  * @name: A theme name
2851  * @variant: (allow-none): variant to load, for example, "dark", or
2852  *     %NULL for the default
2853  *
2854  * Loads a theme from the usual theme paths
2855  *
2856  * Returns: (transfer none): a #GtkCssProvider with the theme loaded.
2857  *     This memory is owned by GTK+, and you must not free it.
2858  */
2859 GtkCssProvider *
2860 gtk_css_provider_get_named (const gchar *name,
2861                             const gchar *variant)
2862 {
2863   static GHashTable *themes = NULL;
2864   GtkCssProvider *provider;
2865   gchar *key;
2866
2867   if (variant == NULL)
2868     key = g_strdup (name);
2869   else
2870     key = g_strconcat (name, "-", variant, NULL);
2871   if (G_UNLIKELY (!themes))
2872     themes = g_hash_table_new (g_str_hash, g_str_equal);
2873
2874   provider = g_hash_table_lookup (themes, key);
2875
2876   if (!provider)
2877     {
2878       provider = gtk_css_provider_new ();
2879       _gtk_css_provider_load_named (provider, name, variant);
2880       g_hash_table_insert (themes, g_strdup (key), provider);
2881     }
2882
2883   g_free (key);
2884
2885   return provider;
2886 }
2887
2888 static int
2889 compare_properties (gconstpointer a, gconstpointer b, gpointer style)
2890 {
2891   const guint *ua = a;
2892   const guint *ub = b;
2893   PropertyValue *styles = style;
2894
2895   return strcmp (_gtk_style_property_get_name (GTK_STYLE_PROPERTY (styles[*ua].property)),
2896                  _gtk_style_property_get_name (GTK_STYLE_PROPERTY (styles[*ub].property)));
2897 }
2898
2899 static int
2900 compare_names (gconstpointer a, gconstpointer b)
2901 {
2902   const WidgetPropertyValue *aa = a;
2903   const WidgetPropertyValue *bb = b;
2904   return strcmp (aa->name, bb->name);
2905 }
2906
2907 static void
2908 gtk_css_ruleset_print (const GtkCssRuleset *ruleset,
2909                        GString             *str)
2910 {
2911   GList *values, *walk;
2912   WidgetPropertyValue *widget_value;
2913   guint i;
2914
2915   _gtk_css_selector_tree_match_print (ruleset->selector_match, str);
2916
2917   g_string_append (str, " {\n");
2918
2919   if (ruleset->styles)
2920     {
2921       guint *sorted = g_new (guint, ruleset->n_styles);
2922
2923       for (i = 0; i < ruleset->n_styles; i++)
2924         sorted[i] = i;
2925
2926       /* so the output is identical for identical selector styles */
2927       g_qsort_with_data (sorted, ruleset->n_styles, sizeof (guint), compare_properties, ruleset->styles);
2928
2929       for (i = 0; i < ruleset->n_styles; i++)
2930         {
2931           PropertyValue *prop = &ruleset->styles[sorted[i]];
2932           g_string_append (str, "  ");
2933           g_string_append (str, _gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop->property)));
2934           g_string_append (str, ": ");
2935           _gtk_css_value_print (prop->value, str);
2936           g_string_append (str, ";\n");
2937         }
2938
2939       g_free (sorted);
2940     }
2941
2942   if (ruleset->widget_style)
2943     {
2944       values = NULL;
2945       for (widget_value = ruleset->widget_style; widget_value != NULL; widget_value = widget_value->next)
2946         values = g_list_prepend (values, widget_value);
2947
2948       /* so the output is identical for identical selector styles */
2949       values = g_list_sort (values, compare_names);
2950
2951       for (walk = values; walk; walk = walk->next)
2952         {
2953           widget_value = walk->data;
2954
2955           g_string_append (str, "  ");
2956           g_string_append (str, widget_value->name);
2957           g_string_append (str, ": ");
2958           g_string_append (str, widget_value->value);
2959           g_string_append (str, ";\n");
2960         }
2961
2962       g_list_free (values);
2963     }
2964
2965   g_string_append (str, "}\n");
2966 }
2967
2968 static void
2969 gtk_css_provider_print_colors (GHashTable *colors,
2970                                GString    *str)
2971 {
2972   GList *keys, *walk;
2973
2974   keys = g_hash_table_get_keys (colors);
2975   /* so the output is identical for identical styles */
2976   keys = g_list_sort (keys, (GCompareFunc) strcmp);
2977
2978   for (walk = keys; walk; walk = walk->next)
2979     {
2980       const char *name = walk->data;
2981       GtkCssValue *color = g_hash_table_lookup (colors, (gpointer) name);
2982
2983       g_string_append (str, "@define-color ");
2984       g_string_append (str, name);
2985       g_string_append (str, " ");
2986       _gtk_css_value_print (color, str);
2987       g_string_append (str, ";\n");
2988     }
2989
2990   g_list_free (keys);
2991 }
2992
2993 static void
2994 gtk_css_provider_print_keyframes (GHashTable *keyframes,
2995                                   GString    *str)
2996 {
2997   GList *keys, *walk;
2998
2999   keys = g_hash_table_get_keys (keyframes);
3000   /* so the output is identical for identical styles */
3001   keys = g_list_sort (keys, (GCompareFunc) strcmp);
3002
3003   for (walk = keys; walk; walk = walk->next)
3004     {
3005       const char *name = walk->data;
3006       GtkCssKeyframes *keyframe = g_hash_table_lookup (keyframes, (gpointer) name);
3007
3008       if (str->len > 0)
3009         g_string_append (str, "\n");
3010       g_string_append (str, "@keyframes ");
3011       g_string_append (str, name);
3012       g_string_append (str, " {\n");
3013       _gtk_css_keyframes_print (keyframe, str);
3014       g_string_append (str, "}\n");
3015     }
3016
3017   g_list_free (keys);
3018 }
3019
3020 /**
3021  * gtk_css_provider_to_string:
3022  * @provider: the provider to write to a string
3023  *
3024  * Convertes the @provider into a string representation in CSS
3025  * format.
3026  *
3027  * Using gtk_css_provider_load_from_data() with the return value
3028  * from this function on a new provider created with
3029  * gtk_css_provider_new() will basicallu create a duplicate of
3030  * this @provider.
3031  *
3032  * Returns: a new string representing the @provider.
3033  *
3034  * Since: 3.2
3035  **/
3036 char *
3037 gtk_css_provider_to_string (GtkCssProvider *provider)
3038 {
3039   GtkCssProviderPrivate *priv;
3040   GString *str;
3041   guint i;
3042
3043   g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
3044
3045   priv = provider->priv;
3046
3047   str = g_string_new ("");
3048
3049   gtk_css_provider_print_colors (priv->symbolic_colors, str);
3050   gtk_css_provider_print_keyframes (priv->keyframes, str);
3051
3052   for (i = 0; i < priv->rulesets->len; i++)
3053     {
3054       if (str->len != 0)
3055         g_string_append (str, "\n");
3056       gtk_css_ruleset_print (&g_array_index (priv->rulesets, GtkCssRuleset, i), str);
3057     }
3058
3059   return g_string_free (str, FALSE);
3060 }
3061