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gtk2/gtk/gtkcssprovider.c

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/* GTK - The GIMP Toolkit
* Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <cairo-gobject.h>
#include "gtkcssproviderprivate.h"
#include "gtkcssstringfuncsprivate.h"
#include "gtksymboliccolor.h"
#include "gtkstyleprovider.h"
#include "gtkstylecontextprivate.h"
#include "gtkbindings.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtkintl.h"
/**
* SECTION:gtkcssprovider
* @Short_description: CSS-like styling for widgets
* @Title: GtkCssProvider
* @See_also: #GtkStyleContext, #GtkStyleProvider
*
* GtkCssProvider is an object implementing the #GtkStyleProvider interface.
* It is able to parse <ulink url="http://www.w3.org/TR/CSS2">CSS</ulink>-like
* input in order to style widgets.
*
* <refsect2 id="gtkcssprovider-files">
* <title>Default files</title>
* <para>
* An application can cause GTK+ to parse a specific CSS style sheet by
* calling gtk_css_provider_load_from_file() and adding the provider with
* gtk_style_context_add_provider() or gtk_style_context_add_provider_for_screen().
* In addition, certain files will be read when GTK+ is initialized. First,
* the file <filename><envar>$XDG_CONFIG_HOME</envar>/gtk-3.0/gtk.css</filename>
* is loaded if it exists. Then, GTK+ tries to load
* <filename><envar>$HOME</envar>/.themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
* falling back to
* <filename><replaceable>datadir</replaceable>/share/themes/<replaceable>theme-name</replaceable>/gtk-3.0/gtk.css</filename>,
* where <replaceable>theme-name</replaceable> is the name of the current theme
* (see the #GtkSettings:gtk-theme-name setting) and <replaceable>datadir</replaceable>
* is the prefix configured when GTK+ was compiled, unless overridden by the
* <envar>GTK_DATA_PREFIX</envar> environment variable.
* </para>
* </refsect2>
* <refsect2 id="gtkcssprovider-stylesheets">
* <title>Style sheets</title>
* <para>
* The basic structure of the style sheets understood by this provider is
* a series of statements, which are either rule sets or '@-rules', separated
* by whitespace.
* </para>
* <para>
* A rule set consists of a selector and a declaration block, which is
* a series of declarations enclosed in curly braces ({ and }). The
* declarations are separated by semicolons (;). Multiple selectors can
* share the same declaration block, by putting all the separators in
* front of the block, separated by commas.
* </para>
* <example><title>A rule set with two selectors</title>
* <programlisting language="text">
* GtkButton, GtkEntry {
* color: &num;ff00ea;
* font: Comic Sans 12
* }
* </programlisting>
* </example>
* </refsect2>
* <refsect2 id="gtkcssprovider-selectors">
* <title>Selectors</title>
* <para>
* Selectors work very similar to the way they do in CSS, with widget class
* names taking the role of element names, and widget names taking the role
* of IDs. When used in a selector, widget names must be prefixed with a
* '&num;' character. The '*' character represents the so-called universal
* selector, which matches any widget.
* </para>
* <para>
* To express more complicated situations, selectors can be combined in
* various ways:
* <itemizedlist>
* <listitem><para>To require that a widget satisfies several conditions,
* combine several selectors into one by concatenating them. E.g.
* <literal>GtkButton&num;button1</literal> matches a GtkButton widget
* with the name button1.</para></listitem>
* <listitem><para>To only match a widget when it occurs inside some other
* widget, write the two selectors after each other, separated by whitespace.
* E.g. <literal>GtkToolBar GtkButton</literal> matches GtkButton widgets
* that occur inside a GtkToolBar.</para></listitem>
* <listitem><para>In the previous example, the GtkButton is matched even
* if it occurs deeply nested inside the toolbar. To restrict the match
* to direct children of the parent widget, insert a '>' character between
* the two selectors. E.g. <literal>GtkNotebook > GtkLabel</literal> matches
* GtkLabel widgets that are direct children of a GtkNotebook.</para></listitem>
* </itemizedlist>
* </para>
* <example>
* <title>Widget classes and names in selectors</title>
* <programlisting language="text">
* /&ast; Theme labels that are descendants of a window &ast;/
* GtkWindow GtkLabel {
* background-color: &num;898989
* }
*
* /&ast; Theme notebooks, and anything that's within these &ast;/
* GtkNotebook {
* background-color: &num;a939f0
* }
*
* /&ast; Theme combo boxes, and entries that
* are direct children of a notebook &ast;/
* GtkComboBox,
* GtkNotebook > GtkEntry {
* color: @fg_color;
* background-color: &num;1209a2
* }
*
* /&ast; Theme any widget within a GtkBin &ast;/
* GtkBin * {
* font-name: Sans 20
* }
*
* /&ast; Theme a label named title-label &ast;/
* GtkLabel&num;title-label {
* font-name: Sans 15
* }
*
* /&ast; Theme any widget named main-entry &ast;/
* &num;main-entry {
* background-color: &num;f0a810
* }
* </programlisting>
* </example>
* <para>
* Widgets may also define style classes, which can be used for matching.
* When used in a selector, style classes must be prefixed with a '.'
* character.
* </para>
* <para>
* Refer to the documentation of individual widgets to learn which
* style classes they define and see <xref linkend="gtkstylecontext-classes"/>
* for a list of all style classes used by GTK+ widgets.
* </para>
* <para>
* Note that there is some ambiguity in the selector syntax when it comes
* to differentiation widget class names from regions. GTK+ currently treats
* a string as a widget class name if it contains any uppercase characters
* (which should work for more widgets with names like GtkLabel).
* </para>
* <example>
* <title>Style classes in selectors</title>
* <programlisting language="text">
* /&ast; Theme all widgets defining the class entry &ast;/
* .entry {
* color: &num;39f1f9;
* }
*
* /&ast; Theme spinbuttons' entry &ast;/
* GtkSpinButton.entry {
* color: &num;900185
* }
* </programlisting>
* </example>
* <para>
* In complicated widgets like e.g. a GtkNotebook, it may be desirable
* to style different parts of the widget differently. To make this
* possible, container widgets may define regions, whose names
* may be used for matching in selectors.
* </para>
* <para>
* Some containers allow to further differentiate between regions by
* applying so-called pseudo-classes to the region. For example, the
* tab region in GtkNotebook allows to single out the first or last
* tab by using the :first-child or :last-child pseudo-class.
* When used in selectors, pseudo-classes must be prefixed with a
* ':' character.
* </para>
* <para>
* Refer to the documentation of individual widgets to learn which
* regions and pseudo-classes they define and see
* <xref linkend="gtkstylecontext-classes"/> for a list of all regions
* used by GTK+ widgets.
* </para>
* <example>
* <title>Regions in selectors</title>
* <programlisting language="text">
* /&ast; Theme any label within a notebook &ast;/
* GtkNotebook GtkLabel {
* color: &num;f90192;
* }
*
* /&ast; Theme labels within notebook tabs &ast;/
* GtkNotebook tab GtkLabel {
* color: &num;703910;
* }
*
* /&ast; Theme labels in the any first notebook
* tab, both selectors are equivalent &ast;/
* GtkNotebook tab:nth-child(first) GtkLabel,
* GtkNotebook tab:first-child GtkLabel {
* color: &num;89d012;
* }
* </programlisting>
* </example>
* <para>
* Another use of pseudo-classes is to match widgets depending on their
* state. This is conceptually similar to the :hover, :active or :focus
* pseudo-classes in CSS. The available pseudo-classes for widget states
* are :active, :prelight (or :hover), :insensitive, :selected, :focused
* and :inconsistent.
* </para>
* <example>
* <title>Styling specific widget states</title>
* <programlisting language="text">
* /&ast; Theme active (pressed) buttons &ast;/
* GtkButton:active {
* background-color: &num;0274d9;
* }
*
* /&ast; Theme buttons with the mouse pointer on it,
* both are equivalent &ast;/
* GtkButton:hover,
* GtkButton:prelight {
* background-color: &num;3085a9;
* }
*
* /&ast; Theme insensitive widgets, both are equivalent &ast;/
* :insensitive,
* *:insensitive {
* background-color: &num;320a91;
* }
*
* /&ast; Theme selection colors in entries &ast;/
* GtkEntry:selected {
* background-color: &num;56f9a0;
* }
*
* /&ast; Theme focused labels &ast;/
* GtkLabel:focused {
* background-color: &num;b4940f;
* }
*
* /&ast; Theme inconsistent checkbuttons &ast;/
* GtkCheckButton:inconsistent {
* background-color: &num;20395a;
* }
* </programlisting>
* </example>
* <para>
* Widget state pseudoclasses may only apply to the last element
* in a selector.
* </para>
* <para>
* To determine the effective style for a widget, all the matching rule
* sets are merged. As in CSS, rules apply by specificity, so the rules
* whose selectors more closely match a widget path will take precedence
* over the others.
* </para>
* </refsect2>
* <refsect2 id="gtkcssprovider-rules">
* <title>&commat; Rules</title>
* <para>
* GTK+'s CSS supports the &commat;import rule, in order to load another
* CSS style sheet in addition to the currently parsed one.
* </para>
* <example>
* <title>Using the &commat;import rule</title>
* <programlisting language="text">
* &commat;import url ("path/to/common.css");
* </programlisting>
* </example>
* <para id="css-binding-set">
* In order to extend key bindings affecting different widgets, GTK+
* supports the &commat;binding-set rule to parse a set of bind/unbind
* directives, see #GtkBindingSet for the supported syntax. Note that
* the binding sets defined in this way must be associated with rule sets
* by setting the gtk-key-bindings style property.
* </para>
* <para>
* Customized key bindings are typically defined in a separate
* <filename>gtk-keys.css</filename> CSS file and GTK+ loads this file
* according to the current key theme, which is defined by the
* #GtkSettings:gtk-key-theme-name setting.
* </para>
* <example>
* <title>Using the &commat;binding rule</title>
* <programlisting language="text">
* &commat;binding-set binding-set1 {
* bind "&lt;alt&gt;Left" { "move-cursor" (visual-positions, -3, 0) };
* unbind "End";
* };
*
* &commat;binding-set binding-set2 {
* bind "&lt;alt&gt;Right" { "move-cursor" (visual-positions, 3, 0) };
* bind "&lt;alt&gt;KP_space" { "delete-from-cursor" (whitespace, 1)
* "insert-at-cursor" (" ") };
* };
*
* GtkEntry {
* gtk-key-bindings: binding-set1, binding-set2;
* }
* </programlisting>
* </example>
* <para>
* GTK+ also supports an additional &commat;define-color rule, in order
* to define a color name which may be used instead of color numeric
* representations. Also see the #GtkSettings:gtk-color-scheme setting
* for a way to override the values of these named colors.
* </para>
* <example>
* <title>Defining colors</title>
* <programlisting language="text">
* &commat;define-color bg_color &num;f9a039;
*
* &ast; {
* background-color: &commat;bg_color;
* }
* </programlisting>
* </example>
* </refsect2>
* <refsect2 id="gtkcssprovider-symbolic-colors">
* <title>Symbolic colors</title>
* <para>
* Besides being able to define color names, the CSS parser is also able
* to read different color expressions, which can also be nested, providing
* a rich language to define colors which are derived from a set of base
* colors.
* </para>
* <example>
* <title>Using symbolic colors</title>
* <programlisting language="text">
* &commat;define-color entry-color shade (&commat;bg_color, 0.7);
*
* GtkEntry {
* background-color: @entry-color;
* }
*
* GtkEntry:focused {
* background-color: mix (&commat;entry-color,
* shade (&num;fff, 0.5),
* 0.8);
* }
* </programlisting>
* </example>
* <para>
* The various ways to express colors in GTK+ CSS are:
* </para>
* <informaltable>
* <tgroup cols="3">
* <thead>
* <row>
* <entry>Syntax</entry>
* <entry>Explanation</entry>
* <entry>Examples</entry>
* </row>
* </thead>
* <tbody>
* <row>
* <entry>rgb(@r, @g, @b)</entry>
* <entry>An opaque color; @r, @g, @b can be either integers between
* 0 and 255 or percentages</entry>
* <entry><literallayout>rgb(128, 10, 54)
* rgb(20%, 30%, 0%)</literallayout></entry>
* </row>
* <row>
* <entry>rgba(@r, @g, @b, @a)</entry>
* <entry>A translucent color; @r, @g, @b are as in the previous row,
* @a is a floating point number between 0 and 1</entry>
* <entry><literallayout>rgba(255, 255, 0, 0.5)</literallayout></entry>
* </row>
* <row>
* <entry>&num;@xxyyzz</entry>
* <entry>An opaque color; @xx, @yy, @zz are hexadecimal numbers
* specifying @r, @g, @b variants with between 1 and 4
* hexadecimal digits per component are allowed</entry>
* <entry><literallayout>&num;ff12ab
* &num;f0c</literallayout></entry>
* </row>
* <row>
* <entry>&commat;name</entry>
* <entry>Reference to a color that has been defined with
* &commat;define-color
* </entry>
* <entry>&commat;bg_color</entry>
* </row>
* <row>
* <entry>mix(@color1, @color2, @f)</entry>
* <entry>A linear combination of @color1 and @color2. @f is a
* floating point number between 0 and 1.</entry>
* <entry><literallayout>mix(&num;ff1e0a, &commat;bg_color, 0.8)</literallayout></entry>
* </row>
* <row>
* <entry>shade(@color, @f)</entry>
* <entry>A lighter or darker variant of @color. @f is a
* floating point number.
* </entry>
* <entry>shade(&commat;fg_color, 0.5)</entry>
* </row>
* <row>
* <entry>lighter(@color)</entry>
* <entry>A lighter variant of @color</entry>
* </row>
* <row>
* <entry>darker(@color)</entry>
* <entry>A darker variant of @color</entry>
* </row>
* </tbody>
* </tgroup>
* </informaltable>
* </refsect2>
* <refsect2 id="gtkcssprovider-gradients">
* <title>Gradients</title>
* <para>
* Linear or radial Gradients can be used as background images.
* </para>
* <para>
* A linear gradient along the line from (@start_x, @start_y) to
* (@end_x, @end_y) is specified using the syntax
* <literallayout>-gtk-gradient (linear,
* @start_x @start_y, @end_x @end_y,
* color-stop (@position, @color),
* ...)</literallayout>
* where @start_x and @end_x can be either a floating point number between
* 0 and 1 or one of the special values 'left', 'right' or 'center', @start_y
* and @end_y can be either a floating point number between 0 and 1 or one
* of the special values 'top', 'bottom' or 'center', @position is a floating
* point number between 0 and 1 and @color is a color expression (see above).
* The color-stop can be repeated multiple times to add more than one color
* stop. 'from (@color)' and 'to (@color)' can be used as abbreviations for
* color stops with position 0 and 1, respectively.
* </para>
* <example>
* <title>A linear gradient</title>
* <inlinegraphic fileref="gradient1.png" format="PNG"/>
* <para>This gradient was specified with
* <literallayout>-gtk-gradient (linear,
* left top, right bottom,
* from(&commat;yellow), to(&commat;blue))</literallayout></para>
* </example>
* <example>
* <title>Another linear gradient</title>
* <inlinegraphic fileref="gradient2.png" format="PNG"/>
* <para>This gradient was specified with
* <literallayout>-gtk-gradient (linear,
* 0 0, 0 1,
* color-stop(0, &commat;yellow),
* color-stop(0.2, &commat;blue),
* color-stop(1, &num;0f0))</literallayout></para>
* </example>
* <para>
* A radial gradient along the two circles defined by (@start_x, @start_y,
* @start_radius) and (@end_x, @end_y, @end_radius) is specified using the
* syntax
* <literallayout>-gtk-gradient (radial,
* @start_x @start_y, @start_radius,
* @end_x @end_y, @end_radius,
* color-stop (@position, @color),
* ...)</literallayout>
* where @start_radius and @end_radius are floating point numbers and
* the other parameters are as before.
* </para>
* <example>
* <title>A radial gradient</title>
* <inlinegraphic fileref="gradient3.png" format="PNG"/>
* <para>This gradient was specified with
* <literallayout>-gtk-gradient (radial,
* center center, 0,
* center center, 1,
* from(&commat;yellow), to(&commat;green))</literallayout></para>
* </example>
* <example>
* <title>Another radial gradient</title>
* <inlinegraphic fileref="gradient4.png" format="PNG"/>
* <para>This gradient was specified with
* <literallayout>-gtk-gradient (radial,
* 0.4 0.4, 0.1,
* 0.6 0.6, 0.7,
* color-stop (0, &num;f00),
* color-stop (0.1, &num;a0f),
* color-stop (0.2, &commat;yellow),
* color-stop (1, &commat;green))</literallayout></para>
* </example>
* </refsect2>
* <refsect2 id="gtkcssprovider-slices">
* <title>Border images</title>
* <para>
* Images can be used in 'slices' for the purpose of creating scalable
* borders.
* </para>
* <inlinegraphic fileref="slices.png" format="PNG"/>
* <para>
* The syntax for specifying border images of this kind is:
* <literallayout>url(@path) @top @right @bottom @left [repeat|stretch]? [repeat|stretch]?</literallayout>
* The sizes of the 'cut off' portions are specified
* with the @top, @right, @bottom and @left parameters.
* The 'middle' sections can be repeated or stretched to create
* the desired effect, by adding the 'repeat' or 'stretch' options after
* the dimensions. If two options are specified, the first one affects
* the horizontal behaviour and the second one the vertical behaviour.
* If only one option is specified, it affects both.
* </para>
* <example>
* <title>A border image</title>
* <inlinegraphic fileref="border1.png" format="PNG"/>
* <para>This border image was specified with
* <literallayout>url("gradient1.png") 10 10 10 10</literallayout>
* </para>
* </example>
* <example>
* <title>A repeating border image</title>
* <inlinegraphic fileref="border2.png" format="PNG"/>
* <para>This border image was specified with
* <literallayout>url("gradient1.png") 10 10 10 10 repeat</literallayout>
* </para>
* </example>
* <example>
* <title>A stretched border image</title>
* <inlinegraphic fileref="border3.png" format="PNG"/>
* <para>This border image was specified with
* <literallayout>url("gradient1.png") 10 10 10 10 stretch</literallayout>
* </para>
* </example>
* </refsect2>
* <refsect2 id="gtkcssprovider-transitions">
* <para>Styles can specify transitions that will be used to create a gradual
* change in the appearance when a widget state changes. The following
* syntax is used to specify transitions:
* <literallayout>@duration [s|ms] [linear|ease|ease-in|ease-out|ease-in-out] [loop]?</literallayout>
* The @duration is the amount of time that the animation will take for
* a complete cycle from start to end. If the loop option is given, the
* animation will be repated until the state changes again.
* The option after the duration determines the transition function from a
* small set of predefined functions.
* <figure><title>Linear transition</title>
* <graphic fileref="linear.png" format="PNG"/>
* </figure>
* <figure><title>Ease transition</title>
* <graphic fileref="ease.png" format="PNG"/>
* </figure>
* <figure><title>Ease-in-out transition</title>
* <graphic fileref="ease-in-out.png" format="PNG"/>
* </figure>
* <figure><title>Ease-in transition</title>
* <graphic fileref="ease-in.png" format="PNG"/>
* </figure>
* <figure><title>Ease-out transition</title>
* <graphic fileref="ease-out.png" format="PNG"/>
* </figure>
* </para>
* </refsect2>
* <refsect2 id="gtkcssprovider-properties">
* <title>Supported properties</title>
* <para>
* Properties are the part that differ the most to common CSS,
* not all properties are supported (some are planned to be
* supported eventually, some others are meaningless or don't
* map intuitively in a widget based environment).
* </para>
* <para>
* There is also a difference in shorthand properties, for
* example in common CSS it is fine to define a font through
* the different @font-family, @font-style, @font-size
* properties, meanwhile in GTK+'s CSS only the canonical
* @font property is supported.
* </para>
* <para>
* The currently supported properties are:
* </para>
* <informaltable>
* <tgroup cols="4">
* <thead>
* <row>
* <entry>Property name</entry>
* <entry>Syntax</entry>
* <entry>Maps to</entry>
* <entry>Examples</entry>
* </row>
* </thead>
* <tbody>
* <row>
* <entry>engine</entry>
* <entry>engine-name</entry>
* <entry>#GtkThemingEngine</entry>
* <entry>engine: clearlooks;
* engine: none; /&ast; use the default (i.e. builtin) engine) &ast;/ </entry>
* </row>
* <row>
* <entry>background-color</entry>
* <entry morerows="2">color (see above)</entry>
* <entry morerows="2">#GdkRGBA</entry>
* <entry morerows="2"><literallayout>background-color: &num;fff;
* color: &amp;color1;
* background-color: shade (&amp;color1, 0.5);
* color: mix (&amp;color1, &num;f0f, 0.8);</literallayout>
* </entry>
* </row>
* <row>
* <entry>color</entry>
* </row>
* <row>
* <entry>border-color</entry>
* </row>
* <row>
* <entry>font</entry>
* <entry>@family [@style] [@size]</entry>
* <entry>#PangoFontDescription</entry>
* <entry>font: Sans 15;</entry>
* </row>
* <row>
* <entry>margin</entry>
* <entry morerows="1"><literallayout>@width
* @vertical_width @horizontal_width
* @top_width @horizontal_width @bottom_width
* @top_width @right_width @bottom_width @left_width</literallayout>
* </entry>
* <entry morerows="1">#GtkBorder</entry>
* <entry morerows="1"><literallayout>margin: 5;
* margin: 5 10;
* margin: 5 10 3;
* margin: 5 10 3 5;</literallayout>
* </entry>
* </row>
* <row>
* <entry>padding</entry>
* </row>
* <row>
* <entry>background-image</entry>
* <entry><literallayout>gradient (see above) or
* url(@path)</literallayout></entry>
* <entry>#cairo_pattern_t</entry>
* <entry><literallayout>-gtk-gradient (linear,
* left top, right top,
* from (&num;fff), to (&num;000));
* -gtk-gradient (linear, 0.0 0.5, 0.5 1.0,
* from (&num;fff),
* color-stop (0.5, &num;f00),
* to (&num;000));
* -gtk-gradient (radial,
* center center, 0.2,
* center center, 0.8,
* color-stop (0.0, &num;fff),
* color-stop (1.0, &num;000));
* url ('background.png');</literallayout>
* </entry>
* </row>
* <row>
* <entry>border-width</entry>
* <entry>integer</entry>
* <entry>#gint</entry>
* <entry>border-width: 5;</entry>
* </row>
* <row>
* <entry>border-radius</entry>
* <entry>integer</entry>
* <entry>#gint</entry>
* <entry>border-radius: 5;</entry>
* </row>
* <row>
* <entry>border-style</entry>
* <entry>[none|solid|inset|outset]</entry>
* <entry>#GtkBorderStyle</entry>
* <entry>border-style: solid;</entry>
* </row>
* <row>
* <entry>border-image</entry>
* <entry><literallayout>border image (see above)</literallayout></entry>
* <entry>internal use only</entry>
* <entry><literallayout>border-image: url("/path/to/image.png") 3 4 3 4 stretch;
* border-image: url("/path/to/image.png") 3 4 4 3 repeat stretch;</literallayout>
* </entry>
* </row>
* <row>
* <entry>transition</entry>
* <entry>transition (see above)</entry>
* <entry>internal use only</entry>
* <entry><literallayout>transition: 150ms ease-in-out;
* transition: 1s linear loop;</literallayout>
* </entry>
* </row>
* <row>
* <entry>gtk-key-bindings</entry>
* <entry>binding set name list</entry>
* <entry>internal use only</entry>
* <entry><literallayout>gtk-bindings: binding1, binding2, ...;</literallayout>
* </entry>
* </row>
* </tbody>
* </tgroup>
* </informaltable>
* <para>
* GtkThemingEngines can register their own, engine-specific style properties
* with the function gtk_theming_engine_register_property(). These properties
* can be set in CSS like other properties, using a name of the form
* <literallayout>-<replaceable>namespace</replaceable>-<replaceable>name</replaceable></literallayout>, where <replaceable>namespace</replaceable> is typically
* the name of the theming engine, and <replaceable>name</replaceable> is the
* name of the property. Style properties that have been registered by widgets
* using gtk_widget_class_install_style_property() can also be set in this
* way, using the widget class name for <replaceable>namespace</replaceable>.
* </para>
* <example>
* <title>Using engine-specific style properties</title>
* <programlisting>
* * {
* engine: clearlooks;
* border-radius: 4;
* -GtkPaned-handle-size: 6;
* -clearlooks-colorize-scrollbar: false;
* }
* </programlisting>
* </example>
* </refsect2>
*/
typedef struct SelectorElement SelectorElement;
typedef struct SelectorPath SelectorPath;
typedef struct SelectorStyleInfo SelectorStyleInfo;
typedef struct _GtkCssScannerPrivate GtkCssScannerPrivate;
typedef enum SelectorElementType SelectorElementType;
typedef enum CombinatorType CombinatorType;
typedef enum ParserScope ParserScope;
typedef enum ParserSymbol ParserSymbol;
enum SelectorElementType {
SELECTOR_TYPE_NAME,
SELECTOR_NAME,
SELECTOR_GTYPE,
SELECTOR_REGION,
SELECTOR_CLASS,
SELECTOR_GLOB
};
enum CombinatorType {
COMBINATOR_DESCENDANT, /* No direct relation needed */
COMBINATOR_CHILD /* Direct child */
};
struct SelectorElement
{
SelectorElementType elem_type;
CombinatorType combinator;
union
{
GQuark name;
GType type;
struct
{
GQuark name;
GtkRegionFlags flags;
} region;
};
};
struct SelectorPath
{
GSList *elements;
GtkStateFlags state;
guint ref_count;
};
struct SelectorStyleInfo
{
SelectorPath *path;
GHashTable *style;
};
struct _GtkCssScannerPrivate
{
GScanner *parent;
GFile *file;
GFile *base;
GSList *state;
GSList *cur_selectors;
GHashTable *cur_properties;
};
struct _GtkCssProviderPrivate
{
GScanner *scanner;
GHashTable *symbolic_colors;
GPtrArray *selectors_info;
};
enum ParserScope {
SCOPE_SELECTOR,
SCOPE_PSEUDO_CLASS,
SCOPE_NTH_CHILD,
SCOPE_DECLARATION,
SCOPE_VALUE,
SCOPE_BINDING_SET
};
/* Extend GtkStateType, since these
* values are also used as symbols
*/
enum ParserSymbol {
/* Scope: pseudo-class */
SYMBOL_NTH_CHILD = GTK_STATE_FOCUSED + 1,
SYMBOL_FIRST_CHILD,
SYMBOL_LAST_CHILD,
SYMBOL_SORTED_CHILD,
/* Scope: nth-child */
SYMBOL_NTH_CHILD_EVEN,
SYMBOL_NTH_CHILD_ODD,
SYMBOL_NTH_CHILD_FIRST,
SYMBOL_NTH_CHILD_LAST
};
enum {
PARSING_ERROR,
LAST_SIGNAL
};
static guint css_provider_signals[LAST_SIGNAL] = { 0 };
static void gtk_css_provider_finalize (GObject *object);
static void gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface);
static void scanner_apply_scope (GScanner *scanner,
ParserScope scope);
static gboolean
gtk_css_provider_load_internal (GtkCssProvider *css_provider,
GScanner *scanner,
GFile *file,
const char *data,
gsize length,
GError **error);
GQuark
gtk_css_provider_error_quark (void)
{
return g_quark_from_static_string ("gtk-css-provider-error-quark");
}
G_DEFINE_TYPE_EXTENDED (GtkCssProvider, gtk_css_provider, G_TYPE_OBJECT, 0,
G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
gtk_css_style_provider_iface_init));
static void
gtk_css_provider_parsing_error (GtkCssProvider *provider,
const gchar *path,
guint line,
guint position,
const GError * error)
{
/* Only emit a warning when we have no error handlers. This is our
* default handlers. And in this case erroneous CSS files are a bug
* and should be fixed.
* Note that these warnings can also be triggered by a broken theme
* that people installed from some weird location on the internets.
*/
if (!g_signal_has_handler_pending (provider,
css_provider_signals[PARSING_ERROR],
0,
TRUE))
{
g_warning ("Theme parsing error: %s:%u:%u: %s", path ? path : "<unknown>", line, position, error->message);
}
}
static void
gtk_css_provider_class_init (GtkCssProviderClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
/**
* GtkCssProvider::parsing-error:
* @provider: the provider that had a parsing error
* @path: path to the parsed file or %NULL if the file cannot be
* identified or the data was not loaded from a file
* @line: line in the file or data or 0 if unknown
* @position: offset into the current line or 0 if unknown or the
* whole line is affected
* @error: The parsing error
*
* Signals that a parsing error occured. the @path, @line and @position
* describe the actual location of the error as accurately as possible.
*
* Parsing errors are never fatal, so the parsing will resume after
* the error. Errors may however cause parts of the given
* data or even all of it to not be parsed at all. So it is a useful idea
* to check that the parsing succeeds by connecting to this signal.
*
* Note that this signal may be emitted at any time as the css provider
* may opt to defer parsing parts or all of the input to a later time
* than when a loading function was called.
*/
css_provider_signals[PARSING_ERROR] =
g_signal_new (I_("parsing-error"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkCssProviderClass, parsing_error),
NULL, NULL,
_gtk_marshal_VOID__STRING_UINT_UINT_BOXED,
G_TYPE_NONE, 4,
G_TYPE_STRING, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_ERROR);
object_class->finalize = gtk_css_provider_finalize;
klass->parsing_error = gtk_css_provider_parsing_error;
g_type_class_add_private (object_class, sizeof (GtkCssProviderPrivate));
}
static void
gtk_css_provider_take_error_full (GtkCssProvider *provider,
GFile *file,
guint line,
guint position,
GError *error)
{
char *filename;
if (file)
filename = g_file_get_path (file);
else
filename = NULL;
g_signal_emit (provider, css_provider_signals[PARSING_ERROR], 0,
filename, line, position, error);
g_free (filename);
g_error_free (error);
}
static SelectorPath *
selector_path_new (void)
{
SelectorPath *path;
path = g_slice_new0 (SelectorPath);
path->ref_count = 1;
return path;
}
static SelectorPath *
selector_path_ref (SelectorPath *path)
{
path->ref_count++;
return path;
}
static void
selector_path_unref (SelectorPath *path)
{
path->ref_count--;
if (path->ref_count > 0)
return;
while (path->elements)
{
g_slice_free (SelectorElement, path->elements->data);
path->elements = g_slist_delete_link (path->elements, path->elements);
}
g_slice_free (SelectorPath, path);
}
static void
selector_path_prepend_type (SelectorPath *path,
const gchar *type_name)
{
SelectorElement *elem;
GType type;
elem = g_slice_new (SelectorElement);
elem->combinator = COMBINATOR_DESCENDANT;
type = g_type_from_name (type_name);
if (type == G_TYPE_INVALID)
{
elem->elem_type = SELECTOR_TYPE_NAME;
elem->name = g_quark_from_string (type_name);
}
else
{
elem->elem_type = SELECTOR_GTYPE;
elem->type = type;
}
path->elements = g_slist_prepend (path->elements, elem);
}
static void
selector_path_prepend_glob (SelectorPath *path)
{
SelectorElement *elem;
elem = g_slice_new (SelectorElement);
elem->elem_type = SELECTOR_GLOB;
elem->combinator = COMBINATOR_DESCENDANT;
path->elements = g_slist_prepend (path->elements, elem);
}
static void
selector_path_prepend_region (SelectorPath *path,
const gchar *name,
GtkRegionFlags flags)
{
SelectorElement *elem;
elem = g_slice_new (SelectorElement);
elem->combinator = COMBINATOR_DESCENDANT;
elem->elem_type = SELECTOR_REGION;
elem->region.name = g_quark_from_string (name);
elem->region.flags = flags;
path->elements = g_slist_prepend (path->elements, elem);
}
static void
selector_path_prepend_name (SelectorPath *path,
const gchar *name)
{
SelectorElement *elem;
elem = g_slice_new (SelectorElement);
elem->combinator = COMBINATOR_DESCENDANT;
elem->elem_type = SELECTOR_NAME;
elem->name = g_quark_from_string (name);
path->elements = g_slist_prepend (path->elements, elem);
}
static void
selector_path_prepend_class (SelectorPath *path,
const gchar *name)
{
SelectorElement *elem;
elem = g_slice_new (SelectorElement);
elem->combinator = COMBINATOR_DESCENDANT;
elem->elem_type = SELECTOR_CLASS;
elem->name = g_quark_from_string (name);
path->elements = g_slist_prepend (path->elements, elem);
}
static void
selector_path_prepend_combinator (SelectorPath *path,
CombinatorType combinator)
{
SelectorElement *elem;
g_assert (path->elements != NULL);
/* It is actually stored in the last element */
elem = path->elements->data;
elem->combinator = combinator;
}
static gint
selector_path_depth (SelectorPath *path)
{
return g_slist_length (path->elements);
}
static SelectorStyleInfo *
selector_style_info_new (SelectorPath *path)
{
SelectorStyleInfo *info;
info = g_slice_new0 (SelectorStyleInfo);
info->path = selector_path_ref (path);
return info;
}
static void
selector_style_info_free (SelectorStyleInfo *info)
{
if (info->style)
g_hash_table_unref (info->style);
if (info->path)
selector_path_unref (info->path);
g_slice_free (SelectorStyleInfo, info);
}
static void
selector_style_info_set_style (SelectorStyleInfo *info,
GHashTable *style)
{
if (info->style)
g_hash_table_unref (info->style);
if (style)
info->style = g_hash_table_ref (style);
else
info->style = NULL;
}
static void
property_value_free (GValue *value)
{
if (G_IS_VALUE (value))
g_value_unset (value);
g_slice_free (GValue, value);
}
static void
gtk_css_scanner_reset (GScanner *scanner)
{
GtkCssScannerPrivate *priv = scanner->user_data;
g_slist_free (priv->state);
priv->state = NULL;
g_slist_foreach (priv->cur_selectors, (GFunc) selector_path_unref, NULL);
g_slist_free (priv->cur_selectors);
priv->cur_selectors = NULL;
if (priv->cur_properties)
g_hash_table_unref (priv->cur_properties);
priv->cur_properties = g_hash_table_new_full (g_str_hash,
g_str_equal,
(GDestroyNotify) g_free,
(GDestroyNotify) property_value_free);
scanner_apply_scope (scanner, SCOPE_SELECTOR);
}
static void
gtk_css_scanner_destroy (GScanner *scanner)
{
GtkCssScannerPrivate *priv = scanner->user_data;
gtk_css_scanner_reset (scanner);
if (priv->file)
g_object_unref (priv->file);
g_hash_table_destroy (priv->cur_properties);
g_slice_free (GtkCssScannerPrivate, priv);
g_scanner_destroy (scanner);
}
static GScanner *
gtk_css_scanner_new (GScanner *parent,
GFile *file,
const gchar *data,
gsize length)
{
GtkCssScannerPrivate *priv;
GScanner *scanner;
scanner = g_scanner_new (NULL);
priv = scanner->user_data = g_slice_new0 (GtkCssScannerPrivate);
priv->parent = parent;
if (file)
{
priv->file = g_object_ref (file);
priv->base = g_file_get_parent (file);
}
else
{
char *dir = g_get_current_dir ();
priv->base = g_file_new_for_path (dir);
g_free (dir);
}
priv->cur_properties = g_hash_table_new_full (g_str_hash,
g_str_equal,
(GDestroyNotify) g_free,
(GDestroyNotify) property_value_free);
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "active", GUINT_TO_POINTER (GTK_STATE_ACTIVE));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "prelight", GUINT_TO_POINTER (GTK_STATE_PRELIGHT));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "hover", GUINT_TO_POINTER (GTK_STATE_PRELIGHT));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "selected", GUINT_TO_POINTER (GTK_STATE_SELECTED));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "insensitive", GUINT_TO_POINTER (GTK_STATE_INSENSITIVE));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "inconsistent", GUINT_TO_POINTER (GTK_STATE_INCONSISTENT));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "focused", GUINT_TO_POINTER (GTK_STATE_FOCUSED));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "focus", GUINT_TO_POINTER (GTK_STATE_FOCUSED));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "nth-child", GUINT_TO_POINTER (SYMBOL_NTH_CHILD));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "first-child", GUINT_TO_POINTER (SYMBOL_FIRST_CHILD));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "last-child", GUINT_TO_POINTER (SYMBOL_LAST_CHILD));
g_scanner_scope_add_symbol (scanner, SCOPE_PSEUDO_CLASS, "sorted", GUINT_TO_POINTER (SYMBOL_SORTED_CHILD));
g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "even", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_EVEN));
g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "odd", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_ODD));
g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "first", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_FIRST));
g_scanner_scope_add_symbol (scanner, SCOPE_NTH_CHILD, "last", GUINT_TO_POINTER (SYMBOL_NTH_CHILD_LAST));
scanner_apply_scope (scanner, SCOPE_SELECTOR);
if (length > G_MAXUINT32)
g_warning ("CSS file too large, truncating");
g_scanner_input_text (scanner, data, length);
return scanner;
}
static GFile *
gtk_css_scanner_get_base_url (GScanner *scanner)
{
GtkCssScannerPrivate *priv = scanner->user_data;
return priv->base;
}
static gboolean
gtk_css_scanner_would_recurse (GScanner *scanner,
GFile *file)
{
while (scanner)
{
GtkCssScannerPrivate *priv = scanner->user_data;
if (priv->file && g_file_equal (priv->file, file))
return TRUE;
scanner = priv->parent;
}
return FALSE;
}
static void
gtk_css_provider_init (GtkCssProvider *css_provider)
{
GtkCssProviderPrivate *priv;
priv = css_provider->priv = G_TYPE_INSTANCE_GET_PRIVATE (css_provider,
GTK_TYPE_CSS_PROVIDER,
GtkCssProviderPrivate);
priv->selectors_info = g_ptr_array_new_with_free_func ((GDestroyNotify) selector_style_info_free);
priv->symbolic_colors = g_hash_table_new_full (g_str_hash, g_str_equal,
(GDestroyNotify) g_free,
(GDestroyNotify) gtk_symbolic_color_unref);
}
typedef struct ComparePathData ComparePathData;
struct ComparePathData
{
guint64 score;
SelectorPath *path;
GSList *iter;
};
static gboolean
compare_selector_element (GtkWidgetPath *path,
guint index,
SelectorElement *elem,
guint8 *score)
{
*score = 0;
if (elem->elem_type == SELECTOR_TYPE_NAME)
{
const gchar *type_name;
GType resolved_type;
/* Resolve the type name */
type_name = g_quark_to_string (elem->name);
resolved_type = g_type_from_name (type_name);
if (resolved_type == G_TYPE_INVALID)
{
/* Type couldn't be resolved, so the selector
* clearly doesn't affect the given widget path
*/
return FALSE;
}
elem->elem_type = SELECTOR_GTYPE;
elem->type = resolved_type;
}
if (elem->elem_type == SELECTOR_GTYPE)
{
GType type;
type = gtk_widget_path_iter_get_object_type (path, index);
if (!g_type_is_a (type, elem->type))
return FALSE;
if (type == elem->type)
*score |= 0xF;
else
{
guint diff = g_type_depth (type) - g_type_depth (elem->type);
if (G_UNLIKELY (diff > 0xE))
{
g_warning ("Hierarchy is higher than expected.");
diff = 0xE;
}
*score = 0XF - diff;
}
return TRUE;
}
else if (elem->elem_type == SELECTOR_REGION)
{
GtkRegionFlags flags;
if (!gtk_widget_path_iter_has_qregion (path, index,
elem->region.name,
&flags))
return FALSE;
if (elem->region.flags != 0 &&
(flags & elem->region.flags) == 0)
return FALSE;
*score = 0xF;
return TRUE;
}
else if (elem->elem_type == SELECTOR_GLOB)
{
/* Treat as lowest matching type */
*score = 1;
return TRUE;
}
else if (elem->elem_type == SELECTOR_NAME)
{
if (!gtk_widget_path_iter_has_qname (path, index, elem->name))
return FALSE;
*score = 0xF;
return TRUE;
}
else if (elem->elem_type == SELECTOR_CLASS)
{
if (!gtk_widget_path_iter_has_qclass (path, index, elem->name))
return FALSE;
*score = 0xF;
return TRUE;
}
return FALSE;
}
static guint64
compare_selector (GtkWidgetPath *path,
SelectorPath *selector)
{
GSList *elements = selector->elements;
gboolean match = TRUE, first = TRUE, first_match = FALSE;
guint64 score = 0;
gint i;
i = gtk_widget_path_length (path) - 1;
while (elements && match && i >= 0)
{
SelectorElement *elem;
guint8 elem_score;
elem = elements->data;
match = compare_selector_element (path, i, elem, &elem_score);
if (match && first)
first_match = TRUE;
/* Only move on to the next index if there is no match
* with the current element (whether to continue or not
* handled right after in the combinator check), or a
* GType or glob has just been matched.
*
* Region and widget names do not trigger this because
* the next element in the selector path could also be
* related to the same index.
*/
if (!match ||
(elem->elem_type == SELECTOR_GTYPE ||
elem->elem_type == SELECTOR_GLOB))
i--;
if (!match &&
elem->elem_type != SELECTOR_TYPE_NAME &&
elem->combinator == COMBINATOR_DESCENDANT)
{
/* With descendant combinators there may
* be intermediate chidren in the hierarchy
*/
match = TRUE;
}
else if (match)
elements = elements->next;
if (match)
{
/* Only 4 bits are actually used */
score <<= 4;
score |= elem_score;
}
first = FALSE;
}
/* If there are pending selector
* elements to compare, it's not
* a match.
*/
if (elements)
match = FALSE;
if (!match)
score = 0;
else if (first_match)
{
/* Assign more weight to these selectors
* that matched right from the first element.
*/
score <<= 4;
}
return score;
}
typedef struct StylePriorityInfo StylePriorityInfo;
struct StylePriorityInfo
{
guint64 score;
GHashTable *style;
GtkStateFlags state;
};
static GArray *
css_provider_get_selectors (GtkCssProvider *css_provider,
GtkWidgetPath *path)
{
GtkCssProviderPrivate *priv;
GArray *priority_info;
guint i, j;
priv = css_provider->priv;
priority_info = g_array_new (FALSE, FALSE, sizeof (StylePriorityInfo));
for (i = 0; i < priv->selectors_info->len; i++)
{
SelectorStyleInfo *info;
StylePriorityInfo new;
gboolean added = FALSE;
guint64 score;
info = g_ptr_array_index (priv->selectors_info, i);
score = compare_selector (path, info->path);
if (score <= 0)
continue;
new.score = score;
new.style = info->style;
new.state = info->path->state;
for (j = 0; j < priority_info->len; j++)
{
StylePriorityInfo *cur;
cur = &g_array_index (priority_info, StylePriorityInfo, j);
if (cur->score > new.score)
{
g_array_insert_val (priority_info, j, new);
added = TRUE;
break;
}
}
if (!added)
g_array_append_val (priority_info, new);
}
return priority_info;
}
static void
css_provider_dump_symbolic_colors (GtkCssProvider *css_provider,
GtkStyleProperties *props)
{
GtkCssProviderPrivate *priv;
GHashTableIter iter;
gpointer key, value;
priv = css_provider->priv;
g_hash_table_iter_init (&iter, priv->symbolic_colors);
while (g_hash_table_iter_next (&iter, &key, &value))
{
const gchar *name;
GtkSymbolicColor *color;
name = key;
color = value;
gtk_style_properties_map_color (props, name, color);
}
}
static GtkStyleProperties *
gtk_css_provider_get_style (GtkStyleProvider *provider,
GtkWidgetPath *path)
{
GtkCssProvider *css_provider;
GtkStyleProperties *props;
GArray *priority_info;
guint i;
css_provider = GTK_CSS_PROVIDER (provider);
props = gtk_style_properties_new ();
css_provider_dump_symbolic_colors (css_provider, props);
priority_info = css_provider_get_selectors (css_provider, path);
for (i = 0; i < priority_info->len; i++)
{
StylePriorityInfo *info;
GHashTableIter iter;
gpointer key, value;
info = &g_array_index (priority_info, StylePriorityInfo, i);
g_hash_table_iter_init (&iter, info->style);
while (g_hash_table_iter_next (&iter, &key, &value))
{
gchar *prop = key;
/* Properties starting with '-' may be both widget style properties
* or custom properties from the theming engine, so check whether
* the type is registered or not.
*/
if (prop[0] == '-' &&
!gtk_style_properties_lookup_property (prop, NULL, NULL))
continue;
gtk_style_properties_set_property (props, key, info->state, value);
}
}
g_array_free (priority_info, TRUE);
return props;
}
static gboolean
gtk_css_provider_get_style_property (GtkStyleProvider *provider,
GtkWidgetPath *path,
GtkStateFlags state,
GParamSpec *pspec,
GValue *value)
{
GArray *priority_info;
gboolean found = FALSE;
gchar *prop_name;
gint i;
prop_name = g_strdup_printf ("-%s-%s",
g_type_name (pspec->owner_type),
pspec->name);
priority_info = css_provider_get_selectors (GTK_CSS_PROVIDER (provider), path);
for (i = priority_info->len - 1; i >= 0; i--)
{
StylePriorityInfo *info;
GValue *val;
info = &g_array_index (priority_info, StylePriorityInfo, i);
val = g_hash_table_lookup (info->style, prop_name);
if (val &&
(info->state == 0 ||
info->state == state ||
((info->state & state) != 0 &&
(info->state & ~(state)) == 0)))
{
GError *error = NULL;
found = _gtk_css_value_from_string (value,
NULL,
g_value_get_string (val),
&error);
if (found)
break;
/* error location should be _way_ better */
gtk_css_provider_take_error_full (GTK_CSS_PROVIDER (provider),
NULL,
0, 0,
error);
}
}
g_array_free (priority_info, TRUE);
g_free (prop_name);
return found;
}
static void
gtk_css_style_provider_iface_init (GtkStyleProviderIface *iface)
{
iface->get_style = gtk_css_provider_get_style;
iface->get_style_property = gtk_css_provider_get_style_property;
}
static void
gtk_css_provider_finalize (GObject *object)
{
GtkCssProvider *css_provider;
GtkCssProviderPrivate *priv;
css_provider = GTK_CSS_PROVIDER (object);
priv = css_provider->priv;
g_ptr_array_free (priv->selectors_info, TRUE);
if (priv->symbolic_colors)
g_hash_table_destroy (priv->symbolic_colors);
G_OBJECT_CLASS (gtk_css_provider_parent_class)->finalize (object);
}
/**
* gtk_css_provider_new:
*
* Returns a newly created #GtkCssProvider.
*
* Returns: A new #GtkCssProvider
**/
GtkCssProvider *
gtk_css_provider_new (void)
{
return g_object_new (GTK_TYPE_CSS_PROVIDER, NULL);
}
static void
gtk_css_provider_take_error (GtkCssProvider *provider,
GScanner *scanner,
GError *error)
{
GtkCssScannerPrivate *priv = scanner->user_data;
gtk_css_provider_take_error_full (provider,
priv->file,
scanner->line,
scanner->position,
error);
}
static void
gtk_css_provider_error_literal (GtkCssProvider *provider,
GScanner *scanner,
GQuark domain,
gint code,
const char *message)
{
gtk_css_provider_take_error (provider,
scanner,
g_error_new_literal (domain, code, message));
}
static void
gtk_css_provider_error (GtkCssProvider *provider,
GScanner *scanner,
GQuark domain,
gint code,
const char *format,
...) G_GNUC_PRINTF (5, 6);
static void
gtk_css_provider_error (GtkCssProvider *provider,
GScanner *scanner,
GQuark domain,
gint code,
const char *format,
...)
{
GError *error;
va_list args;
va_start (args, format);
error = g_error_new_valist (domain, code, format, args);
va_end (args);
gtk_css_provider_take_error (provider, scanner, error);
}
static void
gtk_css_provider_invalid_token (GtkCssProvider *provider,
GScanner *scanner,
const char *expected)
{
gtk_css_provider_error (provider,
scanner,
GTK_CSS_PROVIDER_ERROR,
GTK_CSS_PROVIDER_ERROR_SYNTAX,
"expected a valid %s", expected);
}
static void
scanner_apply_scope (GScanner *scanner,
ParserScope scope)
{
g_scanner_set_scope (scanner, scope);
if (scope == SCOPE_VALUE)
{
scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_\"'";
scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_ +(),.%\t\n'/\"";
scanner->config->scan_identifier_1char = TRUE;
scanner->config->scan_string_sq = FALSE;
scanner->config->scan_string_dq = FALSE;
}
else if (scope == SCOPE_BINDING_SET)
{
scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_";
scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "@#-_ +(){}<>,.%\t\n'/\"";
scanner->config->scan_identifier_1char = TRUE;
scanner->config->scan_string_sq = TRUE;
scanner->config->scan_string_dq = TRUE;
}
else if (scope == SCOPE_SELECTOR)
{
scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "*@";
scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "-_#.";
scanner->config->scan_identifier_1char = TRUE;
scanner->config->scan_string_sq = TRUE;
scanner->config->scan_string_dq = TRUE;
}
else if (scope == SCOPE_PSEUDO_CLASS ||
scope == SCOPE_NTH_CHILD ||
scope == SCOPE_DECLARATION)
{
scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "-_";
scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z G_CSET_DIGITS "-_";
scanner->config->scan_identifier_1char = FALSE;
scanner->config->scan_string_sq = TRUE;
scanner->config->scan_string_dq = TRUE;
}
else
g_assert_not_reached ();
scanner->config->scan_float = FALSE;
scanner->config->cpair_comment_single = NULL;
}
static void
gtk_css_scanner_push_scope (GScanner *scanner,
ParserScope scope)
{
GtkCssScannerPrivate *priv;
priv = scanner->user_data;
priv->state = g_slist_prepend (priv->state, GUINT_TO_POINTER (scope));
scanner_apply_scope (scanner, scope);
}
static void
gtk_css_scanner_pop_scope (GScanner *scanner)
{
GtkCssScannerPrivate *priv;
ParserScope scope = SCOPE_SELECTOR;
priv = scanner->user_data;
if (!priv->state)
{
g_warning ("Push/pop calls to parser scope aren't paired");
scanner_apply_scope (scanner, SCOPE_SELECTOR);
return;
}
priv->state = g_slist_delete_link (priv->state, priv->state);
/* Fetch new scope */
if (priv->state)
scope = GPOINTER_TO_INT (priv->state->data);
scanner_apply_scope (scanner, scope);
}
static void
css_provider_commit (GtkCssProvider *css_provider,
GScanner *scanner)
{
GtkCssScannerPrivate *scanner_priv;
GtkCssProviderPrivate *priv;
GSList *l;
priv = css_provider->priv;
scanner_priv = scanner->user_data;
l = scanner_priv->cur_selectors;
if (g_hash_table_size (scanner_priv->cur_properties) == 0)
return;
while (l)
{
SelectorPath *path = l->data;
SelectorStyleInfo *info;
info = selector_style_info_new (path);
selector_style_info_set_style (info, scanner_priv->cur_properties);
g_ptr_array_add (priv->selectors_info, info);
l = l->next;
}
}
static GTokenType
parse_nth_child (GtkCssProvider *css_provider,
GScanner *scanner,
GtkRegionFlags *flags)
{
ParserSymbol symbol;
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_SYMBOL)
return G_TOKEN_SYMBOL;
symbol = GPOINTER_TO_INT (scanner->value.v_symbol);
if (symbol == SYMBOL_NTH_CHILD)
{
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_LEFT_PAREN)
return G_TOKEN_LEFT_PAREN;
gtk_css_scanner_push_scope (scanner, SCOPE_NTH_CHILD);
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_SYMBOL)
return G_TOKEN_SYMBOL;
symbol = GPOINTER_TO_INT (scanner->value.v_symbol);
switch (symbol)
{
case SYMBOL_NTH_CHILD_EVEN:
*flags = GTK_REGION_EVEN;
break;
case SYMBOL_NTH_CHILD_ODD:
*flags = GTK_REGION_ODD;
break;
case SYMBOL_NTH_CHILD_FIRST:
*flags = GTK_REGION_FIRST;
break;
case SYMBOL_NTH_CHILD_LAST:
*flags = GTK_REGION_LAST;
break;
default:
break;
}
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_RIGHT_PAREN)
return G_TOKEN_RIGHT_PAREN;
gtk_css_scanner_pop_scope (scanner);
}
else if (symbol == SYMBOL_FIRST_CHILD)
*flags = GTK_REGION_FIRST;
else if (symbol == SYMBOL_LAST_CHILD)
*flags = GTK_REGION_LAST;
else if (symbol == SYMBOL_SORTED_CHILD)
*flags = GTK_REGION_SORTED;
else
{
*flags = 0;
return G_TOKEN_SYMBOL;
}
return G_TOKEN_NONE;
}
static GTokenType
parse_pseudo_class (GtkCssProvider *css_provider,
GScanner *scanner,
SelectorPath *selector)
{
GtkStateType state;
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_SYMBOL)
return G_TOKEN_SYMBOL;
state = GPOINTER_TO_INT (scanner->value.v_symbol);
switch (state)
{
case GTK_STATE_ACTIVE:
selector->state |= GTK_STATE_FLAG_ACTIVE;
break;
case GTK_STATE_PRELIGHT:
selector->state |= GTK_STATE_FLAG_PRELIGHT;
break;
case GTK_STATE_SELECTED:
selector->state |= GTK_STATE_FLAG_SELECTED;
break;
case GTK_STATE_INSENSITIVE:
selector->state |= GTK_STATE_FLAG_INSENSITIVE;
break;
case GTK_STATE_INCONSISTENT:
selector->state |= GTK_STATE_FLAG_INCONSISTENT;
break;
case GTK_STATE_FOCUSED:
selector->state |= GTK_STATE_FLAG_FOCUSED;
break;
default:
return G_TOKEN_SYMBOL;
}
return G_TOKEN_NONE;
}
/* Parses a number of concatenated classes */
static void
parse_classes (SelectorPath *path,
const gchar *str)
{
gchar *pos;
if ((pos = strchr (str, '.')) != NULL)
{
/* Leave the last class to the call after the loop */
while (pos)
{
*pos = '\0';
selector_path_prepend_class (path, str);
str = pos + 1;
pos = strchr (str, '.');
}
}
selector_path_prepend_class (path, str);
}
static gboolean
is_widget_class_name (const gchar *str)
{
/* Do a pretty lax check here, not all
* widget class names contain only CamelCase
* (gtkmm widgets don't), but at least part of
* the name will be CamelCase, so check for
* the first uppercase char
*/
while (*str)
{
if (g_ascii_isupper (*str))
return TRUE;
str++;
}
return FALSE;
}
static GTokenType
parse_selector (GtkCssProvider *css_provider,
GScanner *scanner,
SelectorPath **selector_out)
{
SelectorPath *path;
path = selector_path_new ();
*selector_out = path;
if (scanner->token != ':' &&
scanner->token != '#' &&
scanner->token != '.' &&
scanner->token != G_TOKEN_IDENTIFIER)
return G_TOKEN_IDENTIFIER;
while (scanner->token == '#' ||
scanner->token == '.' ||
scanner->token == G_TOKEN_IDENTIFIER)
{
if (scanner->token == '#' ||
scanner->token == '.')
{
gboolean is_class;
gchar *pos;
is_class = (scanner->token == '.');
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_IDENTIFIER)
return G_TOKEN_IDENTIFIER;
selector_path_prepend_glob (path);
selector_path_prepend_combinator (path, COMBINATOR_CHILD);
if (is_class)
parse_classes (path, scanner->value.v_identifier);
else
{
if ((pos = strchr (scanner->value.v_identifier, '.')) != NULL)
*pos = '\0';
selector_path_prepend_name (path, scanner->value.v_identifier);
/* Parse any remaining classes */
if (pos)
parse_classes (path, pos + 1);
}
}
else if (is_widget_class_name (scanner->value.v_identifier))
{
gchar *pos;
if ((pos = strchr (scanner->value.v_identifier, '#')) != NULL ||
(pos = strchr (scanner->value.v_identifier, '.')) != NULL)
{
gchar *type_name, *name;
gboolean is_class;
is_class = (*pos == '.');
/* Widget type and name/class put together */
name = pos + 1;
*pos = '\0';
type_name = scanner->value.v_identifier;
selector_path_prepend_type (path, type_name);
/* This is only so there is a direct relationship
* between widget type and its name.
*/
selector_path_prepend_combinator (path, COMBINATOR_CHILD);
if (is_class)
parse_classes (path, name);
else
{
if ((pos = strchr (name, '.')) != NULL)
*pos = '\0';
selector_path_prepend_name (path, name);
/* Parse any remaining classes */
if (pos)
parse_classes (path, pos + 1);
}
}
else
selector_path_prepend_type (path, scanner->value.v_identifier);
}
else if (_gtk_style_context_check_region_name (scanner->value.v_identifier))
{
GtkRegionFlags flags = 0;
gchar *region_name;
region_name = g_strdup (scanner->value.v_identifier);
if (g_scanner_peek_next_token (scanner) == ':')
{
ParserSymbol symbol;
g_scanner_get_next_token (scanner);
gtk_css_scanner_push_scope (scanner, SCOPE_PSEUDO_CLASS);
/* Check for the next token being nth-child, parse in that
* case, and fallback into common state parsing if not.
*/
if (g_scanner_peek_next_token (scanner) != G_TOKEN_SYMBOL)
return G_TOKEN_SYMBOL;
symbol = GPOINTER_TO_INT (scanner->next_value.v_symbol);
if (symbol == SYMBOL_FIRST_CHILD ||
symbol == SYMBOL_LAST_CHILD ||
symbol == SYMBOL_NTH_CHILD ||
symbol == SYMBOL_SORTED_CHILD)
{
GTokenType token;
if ((token = parse_nth_child (css_provider, scanner, &flags)) != G_TOKEN_NONE)
return token;
gtk_css_scanner_pop_scope (scanner);
}
else
{
gtk_css_scanner_pop_scope (scanner);
selector_path_prepend_region (path, region_name, 0);
g_free (region_name);
break;
}
}
selector_path_prepend_region (path, region_name, flags);
g_free (region_name);
}
else if (scanner->value.v_identifier[0] == '*')
selector_path_prepend_glob (path);
else
return G_TOKEN_IDENTIFIER;
g_scanner_get_next_token (scanner);
if (scanner->token == '>')
{
selector_path_prepend_combinator (path, COMBINATOR_CHILD);
g_scanner_get_next_token (scanner);
}
}
if (scanner->token == ':')
{
/* Add glob selector if path is empty */
if (selector_path_depth (path) == 0)
selector_path_prepend_glob (path);
gtk_css_scanner_push_scope (scanner, SCOPE_PSEUDO_CLASS);
while (scanner->token == ':')
{
GTokenType token;
if ((token = parse_pseudo_class (css_provider, scanner, path)) != G_TOKEN_NONE)
return token;
g_scanner_get_next_token (scanner);
}
gtk_css_scanner_pop_scope (scanner);
}
return G_TOKEN_NONE;
}
static void
resolve_binding_sets (const gchar *value_str,
GValue *value)
{
GPtrArray *array;
gchar **bindings, **str;
bindings = g_strsplit (value_str, ",", -1);
array = g_ptr_array_new ();
for (str = bindings; *str; str++)
{
GtkBindingSet *binding_set;
binding_set = gtk_binding_set_find (g_strstrip (*str));
if (!binding_set)
continue;
g_ptr_array_add (array, binding_set);
}
g_value_take_boxed (value, array);
g_strfreev (bindings);
}
static GTokenType
parse_rule (GtkCssProvider *css_provider,
GScanner *scanner)
{
GtkCssScannerPrivate *priv;
GTokenType expected_token;
SelectorPath *selector;
priv = scanner->user_data;
gtk_css_scanner_push_scope (scanner, SCOPE_SELECTOR);
/* Handle directives */
if (scanner->token == G_TOKEN_IDENTIFIER &&
scanner->value.v_identifier[0] == '@')
{
gchar *directive;
directive = &scanner->value.v_identifier[1];
if (strcmp (directive, "define-color") == 0)
{
GtkSymbolicColor *color;
gchar *color_name, *color_str;
GError *error = NULL;
/* Directive is a color mapping */
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_IDENTIFIER)
{
gtk_css_provider_invalid_token (css_provider, scanner, "Color name");
return G_TOKEN_IDENTIFIER;
}
color_name = g_strdup (scanner->value.v_identifier);
gtk_css_scanner_push_scope (scanner, SCOPE_VALUE);
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_IDENTIFIER)
{
gtk_css_provider_invalid_token (css_provider, scanner, "Color definition");
return G_TOKEN_IDENTIFIER;
}
color_str = g_strstrip (scanner->value.v_identifier);
color = _gtk_css_parse_symbolic_color (color_str, &error);
if (!color)
{
gtk_css_provider_take_error (css_provider, scanner, error);
return G_TOKEN_IDENTIFIER;
}
g_hash_table_insert (css_provider->priv->symbolic_colors, color_name, color);
gtk_css_scanner_pop_scope (scanner);
g_scanner_get_next_token (scanner);
if (scanner->token != ';')
return ';';
return G_TOKEN_NONE;
}
else if (strcmp (directive, "import") == 0)
{
gchar *path = NULL;
GFile *actual;
GError *error = NULL;
gtk_css_scanner_push_scope (scanner, SCOPE_VALUE);
g_scanner_get_next_token (scanner);
if (scanner->token == G_TOKEN_IDENTIFIER &&
g_str_has_prefix (scanner->value.v_identifier, "url"))
path = g_strstrip (scanner->value.v_identifier);
else if (scanner->token == G_TOKEN_STRING)
path = g_strstrip (scanner->value.v_string);
else
{
gtk_css_provider_invalid_token (css_provider, scanner, "File URL");
return G_TOKEN_IDENTIFIER;
}
actual = _gtk_css_parse_url (gtk_css_scanner_get_base_url (scanner),
path,
NULL,
&error);
if (actual == NULL)
{
gtk_css_provider_take_error (css_provider, scanner, error);
return G_TOKEN_IDENTIFIER;
}
gtk_css_scanner_pop_scope (scanner);
g_scanner_get_next_token (scanner);
if (scanner->token != ';')
{
g_object_unref (actual);
return ';';
}
if (gtk_css_scanner_would_recurse (scanner, actual))
{
char *path = g_file_get_path (actual);
gtk_css_provider_error (css_provider,
scanner,
GTK_CSS_PROVIDER_ERROR,
GTK_CSS_PROVIDER_ERROR_IMPORT,
"Loading '%s' would recurse",
path);
g_free (path);
}
else
{
gtk_css_provider_load_internal (css_provider,
scanner,
actual,
NULL, 0,
NULL);
}
g_object_unref (actual);
return G_TOKEN_NONE;
}
else if (strcmp (directive, "binding-set") == 0)
{
GtkBindingSet *binding_set;
gchar *binding_set_name;
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_IDENTIFIER)
{
gtk_css_provider_invalid_token (css_provider, scanner, "Binding name");
return G_TOKEN_IDENTIFIER;
}
binding_set_name = scanner->value.v_identifier;
binding_set = gtk_binding_set_find (binding_set_name);
if (!binding_set)
{
binding_set = gtk_binding_set_new (binding_set_name);
binding_set->parsed = TRUE;
}
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_LEFT_CURLY)
return G_TOKEN_LEFT_CURLY;
gtk_css_scanner_push_scope (scanner, SCOPE_BINDING_SET);
g_scanner_get_next_token (scanner);
do
{
GTokenType ret;
if (scanner->token != G_TOKEN_IDENTIFIER)
{
gtk_css_provider_invalid_token (css_provider, scanner, "Binding definition");
return G_TOKEN_IDENTIFIER;
}
ret = gtk_binding_entry_add_signal_from_string (binding_set,
scanner->value.v_identifier);
if (ret != G_TOKEN_NONE)
{
gtk_css_provider_invalid_token (css_provider, scanner, "Binding definition");
return ret;
}
g_scanner_get_next_token (scanner);
if (scanner->token != ';')
return ';';
g_scanner_get_next_token (scanner);
}
while (scanner->token != G_TOKEN_RIGHT_CURLY);
gtk_css_scanner_pop_scope (scanner);
g_scanner_get_next_token (scanner);
return G_TOKEN_NONE;
}
else
{
gtk_css_provider_invalid_token (css_provider, scanner, "Directive");
return G_TOKEN_IDENTIFIER;
}
}
expected_token = parse_selector (css_provider, scanner, &selector);
if (expected_token != G_TOKEN_NONE)
{
selector_path_unref (selector);
gtk_css_provider_invalid_token (css_provider, scanner, "Selector");
return expected_token;
}
priv->cur_selectors = g_slist_prepend (priv->cur_selectors, selector);
while (scanner->token == ',')
{
g_scanner_get_next_token (scanner);
expected_token = parse_selector (css_provider, scanner, &selector);
if (expected_token != G_TOKEN_NONE)
{
selector_path_unref (selector);
gtk_css_provider_invalid_token (css_provider, scanner, "Selector");
return expected_token;
}
priv->cur_selectors = g_slist_prepend (priv->cur_selectors, selector);
}
gtk_css_scanner_pop_scope (scanner);
if (scanner->token != G_TOKEN_LEFT_CURLY)
return G_TOKEN_LEFT_CURLY;
/* Declarations parsing */
gtk_css_scanner_push_scope (scanner, SCOPE_DECLARATION);
g_scanner_get_next_token (scanner);
while (scanner->token != G_TOKEN_RIGHT_CURLY &&
!g_scanner_eof (scanner))
{
gchar *value_str = NULL;
GtkStylePropertyParser parse_func = NULL;
GParamSpec *pspec = NULL;;
gchar *prop;
if (scanner->token == ';')
{
g_scanner_get_next_token (scanner);
continue;
}
if (scanner->token != G_TOKEN_IDENTIFIER)
{
gtk_css_provider_error_literal (css_provider,
scanner,
GTK_CSS_PROVIDER_ERROR,
GTK_CSS_PROVIDER_ERROR_PROPERTY_NAME,
"Expected a valid property name");
goto find_end_of_declaration;
}
prop = g_strdup (scanner->value.v_identifier);
if (!gtk_style_properties_lookup_property (prop, &parse_func, &pspec) &&
prop[0] != '-')
{
gtk_css_provider_error (css_provider,
scanner,
GTK_CSS_PROVIDER_ERROR,
GTK_CSS_PROVIDER_ERROR_PROPERTY_NAME,
"'%s' is not a valid property name",
prop);
g_free (prop);
goto find_end_of_declaration;
}
g_scanner_get_next_token (scanner);
if (scanner->token != ':')
{
g_free (prop);
gtk_css_provider_invalid_token (css_provider, scanner, "':'");
goto find_end_of_declaration;
}
gtk_css_scanner_push_scope (scanner, SCOPE_VALUE);
g_scanner_get_next_token (scanner);
if (scanner->token != G_TOKEN_IDENTIFIER)
{
g_free (prop);
/* the error value here is hacky. But strings should be used for
* strings really, so a string is not a syntax error but a broken
* value for everything that we support. */
gtk_css_provider_error (css_provider,
scanner,
GTK_CSS_PROVIDER_ERROR,
GTK_CSS_PROVIDER_ERROR_SYNTAX,
"Not a property value");
gtk_css_scanner_pop_scope (scanner);
goto find_end_of_declaration;
}
value_str = scanner->value.v_identifier;
g_strchomp (value_str);
gtk_css_scanner_pop_scope (scanner);
g_scanner_peek_next_token (scanner);
if (scanner->next_token != ';' &&
scanner->next_token != G_TOKEN_RIGHT_CURLY &&
scanner->next_token != G_TOKEN_EOF)
{
gtk_css_provider_invalid_token (css_provider, scanner, "';'");
g_free (prop);
goto find_end_of_declaration;
}
if (pspec)
{
GValue *val;
val = g_slice_new0 (GValue);
g_value_init (val, pspec->value_type);
if (strcmp (value_str, "none") == 0)
{
/* Insert the default value, so it has an opportunity
* to override other style providers when merged
*/
g_param_value_set_default (pspec, val);
g_hash_table_insert (priv->cur_properties, prop, val);
}
else if (strcmp (prop, "gtk-key-bindings") == 0)
{
/* Private property holding the binding sets */
resolve_binding_sets (value_str, val);
g_hash_table_insert (priv->cur_properties, prop, val);
}
else if (pspec->value_type == G_TYPE_STRING)
{
g_value_set_string (val, value_str);
g_hash_table_insert (priv->cur_properties, prop, val);
}
else if (parse_func)
{
GError *error = NULL;
if ((*parse_func) (value_str, val, &error))
g_hash_table_insert (priv->cur_properties, prop, val);
else
gtk_css_provider_take_error (css_provider, scanner, error);
}
else
{
GError *error = NULL;
if (_gtk_css_value_from_string (val,
gtk_css_scanner_get_base_url (scanner),
value_str,
&error))
{
g_hash_table_insert (priv->cur_properties, prop, val);
}
else
{
g_value_unset (val);
g_slice_free (GValue, val);
g_free (prop);
gtk_css_provider_take_error (css_provider, scanner, error);
}
}
}
else if (prop[0] == '-')
{
GValue *val;
val = g_slice_new0 (GValue);
g_value_init (val, G_TYPE_STRING);
g_value_set_string (val, value_str);
g_hash_table_insert (priv->cur_properties, prop, val);
}
else
g_free (prop);
g_scanner_get_next_token (scanner);
if (g_scanner_eof (scanner))
{
gtk_css_provider_invalid_token (css_provider, scanner, "}");
break;
}
find_end_of_declaration:
while (scanner->token != ';' &&
scanner->token != G_TOKEN_RIGHT_CURLY &&
!g_scanner_eof (scanner))
g_scanner_get_next_token (scanner);
}
gtk_css_scanner_pop_scope (scanner);
return G_TOKEN_NONE;
}
static void
gtk_css_provider_reset (GtkCssProvider *css_provider)
{
GtkCssProviderPrivate *priv;
priv = css_provider->priv;
if (priv->selectors_info->len > 0)
g_ptr_array_remove_range (priv->selectors_info, 0, priv->selectors_info->len);
}
static void
gtk_css_provider_propagate_error (GtkCssProvider *provider,
const gchar *path,
guint line,
guint position,
const GError *error,
GError **propagate_to)
{
/* we already set an error. And we'd like to keep the first one */
if (*propagate_to)
return;
*propagate_to = g_error_copy (error);
g_prefix_error (propagate_to, "%s:%u:%u: ", path ? path : "<unknown>", line, position);
}
static void
parse_stylesheet (GtkCssProvider *css_provider,
GScanner *scanner)
{
g_scanner_get_next_token (scanner);
while (!g_scanner_eof (scanner))
{
GTokenType expected_token;
expected_token = parse_rule (css_provider, scanner);
if (expected_token != G_TOKEN_NONE)
{
while (!g_scanner_eof (scanner) &&
scanner->token != G_TOKEN_RIGHT_CURLY)
g_scanner_get_next_token (scanner);
}
else
css_provider_commit (css_provider, scanner);
g_scanner_get_next_token (scanner);
gtk_css_scanner_reset (scanner);
}
}
static gboolean
gtk_css_provider_load_internal (GtkCssProvider *css_provider,
GScanner *parent,
GFile *file,
const char *data,
gsize length,
GError **error)
{
GScanner *scanner;
gulong error_handler;
char *free_data;
if (error)
error_handler = g_signal_connect (css_provider,
"parsing-error",
G_CALLBACK (gtk_css_provider_propagate_error),
error);
else
error_handler = 0; /* silence gcc */
if (data == NULL)
{
GError *load_error = NULL;
if (g_file_load_contents (file, NULL,
&free_data, &length,
NULL, &load_error))
{
data = free_data;
}
else
{
if (parent)
{
gtk_css_provider_error (css_provider,
parent,
GTK_CSS_PROVIDER_ERROR,
GTK_CSS_PROVIDER_ERROR_IMPORT,
"Failed to import: %s",
load_error->message);
g_error_free (load_error);
}
else
{
gtk_css_provider_take_error_full (css_provider,
file,
0, 0,
load_error);
}
}
}
else
free_data = NULL;
if (data)
{
scanner = gtk_css_scanner_new (parent, file, data, length);
parse_stylesheet (css_provider, scanner);
gtk_css_scanner_destroy (scanner);
}
if (error)
{
g_signal_handler_disconnect (css_provider, error_handler);
if (*error)
{
/* We clear all contents from the provider for backwards compat reasons */
gtk_css_provider_reset (css_provider);
return FALSE;
}
}
return TRUE;
}
/**
* gtk_css_provider_load_from_data:
* @css_provider: a #GtkCssProvider
* @data: CSS data loaded in memory
* @length: the length of @data in bytes, or -1 for NUL terminated strings
* @error: (out) (allow-none): return location for a #GError, or %NULL
*
* Loads @data into @css_provider, making it clear any previously loaded
* information.
*
* Returns: %TRUE if the data could be loaded.
**/
gboolean
gtk_css_provider_load_from_data (GtkCssProvider *css_provider,
const gchar *data,
gssize length,
GError **error)
{
g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
g_return_val_if_fail (data != NULL, FALSE);
if (length < 0)
length = strlen (data);
gtk_css_provider_reset (css_provider);
return gtk_css_provider_load_internal (css_provider, NULL, NULL, data, length, error);
}
/**
* gtk_css_provider_load_from_file:
* @css_provider: a #GtkCssProvider
* @file: #GFile pointing to a file to load
* @error: (out) (allow-none): return location for a #GError, or %NULL
*
* Loads the data contained in @file into @css_provider, making it
* clear any previously loaded information.
*
* Returns: %TRUE if the data could be loaded.
**/
gboolean
gtk_css_provider_load_from_file (GtkCssProvider *css_provider,
GFile *file,
GError **error)
{
g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
g_return_val_if_fail (G_IS_FILE (file), FALSE);
gtk_css_provider_reset (css_provider);
return gtk_css_provider_load_internal (css_provider, NULL, file, NULL, 0, error);
}
/**
* gtk_css_provider_load_from_path:
* @css_provider: a #GtkCssProvider
* @path: the path of a filename to load, in the GLib filename encoding
* @error: (out) (allow-none): return location for a #GError, or %NULL
*
* Loads the data contained in @path into @css_provider, making it clear
* any previously loaded information.
*
* Returns: %TRUE if the data could be loaded.
**/
gboolean
gtk_css_provider_load_from_path (GtkCssProvider *css_provider,
const gchar *path,
GError **error)
{
GFile *file;
gboolean result;
g_return_val_if_fail (GTK_IS_CSS_PROVIDER (css_provider), FALSE);
g_return_val_if_fail (path != NULL, FALSE);
file = g_file_new_for_path (path);
result = gtk_css_provider_load_from_file (css_provider, file, error);
g_object_unref (file);
return result;
}
/**
* gtk_css_provider_get_default:
*
* Returns the provider containing the style settings used as a
* fallback for all widgets.
*
* Returns: (transfer none): The provider used for fallback styling.
* This memory is owned by GTK+, and you must not free it.
**/
GtkCssProvider *
gtk_css_provider_get_default (void)
{
static GtkCssProvider *provider;
if (G_UNLIKELY (!provider))
{
const gchar *str =
"@define-color fg_color #000; \n"
"@define-color bg_color #dcdad5; \n"
"@define-color text_color #000; \n"
"@define-color base_color #fff; \n"
"@define-color selected_bg_color #4b6983; \n"
"@define-color selected_fg_color #fff; \n"
"@define-color tooltip_bg_color #eee1b3; \n"
"@define-color tooltip_fg_color #000; \n"
"@define-color placeholder_text_color #808080; \n"
"\n"
"@define-color info_fg_color rgb (181, 171, 156);\n"
"@define-color info_bg_color rgb (252, 252, 189);\n"
"@define-color warning_fg_color rgb (173, 120, 41);\n"
"@define-color warning_bg_color rgb (250, 173, 61);\n"
"@define-color question_fg_color rgb (97, 122, 214);\n"
"@define-color question_bg_color rgb (138, 173, 212);\n"
"@define-color error_fg_color rgb (166, 38, 38);\n"
"@define-color error_bg_color rgb (237, 54, 54);\n"
"\n"
"* {\n"
" background-color: @bg_color;\n"
" color: @fg_color;\n"
" border-color: shade (@bg_color, 0.6);\n"
" padding: 2;\n"
" border-width: 0;\n"
"}\n"
"\n"
"*:prelight {\n"
" background-color: shade (@bg_color, 1.05);\n"
" color: shade (@fg_color, 1.3);\n"
"}\n"
"\n"
"*:selected {\n"
" background-color: @selected_bg_color;\n"
" color: @selected_fg_color;\n"
"}\n"
"\n"
".expander, GtkTreeView.view.expander {\n"
" color: #fff;\n"
"}\n"
"\n"
".expander:prelight,\n"
"GtkTreeView.view.expander:selected:prelight {\n"
" color: @text_color;\n"
"}\n"
"\n"
".expander:active {\n"
" transition: 200ms linear;\n"
"}\n"
"\n"
"*:insensitive {\n"
" border-color: shade (@bg_color, 0.7);\n"
" background-color: shade (@bg_color, 0.9);\n"
" color: shade (@bg_color, 0.7);\n"
"}\n"
"\n"
".view {\n"
" border-width: 0;\n"
" border-radius: 0;\n"
" background-color: @base_color;\n"
" color: @text_color;\n"
"}\n"
".view:selected {\n"
" background-color: shade (@bg_color, 0.9);\n"
" color: @fg_color;\n"
"}\n"
"\n"
".view:selected:focused {\n"
" background-color: @selected_bg_color;\n"
" color: @selected_fg_color;\n"
"}\n"
"\n"
".view column:sorted row,\n"
".view column:sorted row:prelight {\n"
" background-color: shade (@bg_color, 0.85);\n"
"}\n"
"\n"
".view column:sorted row:nth-child(odd),\n"
".view column:sorted row:nth-child(odd):prelight {\n"
" background-color: shade (@bg_color, 0.8);\n"
"}\n"
"\n"
".view row,\n"
".view row:prelight {\n"
" background-color: @base_color;\n"
" color: @text_color;\n"
"}\n"
"\n"
".view row:nth-child(odd),\n"
".view row:nth-child(odd):prelight {\n"
" background-color: shade (@base_color, 0.93); \n"
"}\n"
"\n"
".view row:selected:focused {\n"
" background-color: @selected_bg_color;\n"
"}\n"
"\n"
".view row:selected {\n"
" background-color: darker (@bg_color);\n"
" color: @selected_fg_color;\n"
"}\n"
"\n"
".view.cell.trough,\n"
".view.cell.trough:hover,\n"
".view.cell.trough:selected,\n"
".view.cell.trough:selected:focused {\n"
" background-color: @bg_color;\n"
" color: @fg_color;\n"
"}\n"
"\n"
".view.cell.progressbar,\n"
".view.cell.progressbar:hover,\n"
".view.cell.progressbar:selected,\n"
".view.cell.progressbar:selected:focused {\n"
" background-color: @selected_bg_color;\n"
" color: @selected_fg_color;\n"
"}\n"
"\n"
".rubberband {\n"
" background-color: alpha (@fg_color, 0.25);\n"
" border-color: @fg_color;\n"
" border-style: solid;\n"
" border-width: 1;\n"
"}\n"
"\n"
".tooltip {\n"
" background-color: @tooltip_bg_color; \n"
" color: @tooltip_fg_color; \n"
" border-color: @tooltip_fg_color; \n"
" border-width: 1;\n"
" border-style: solid;\n"
"}\n"
"\n"
".button,\n"
".slider {\n"
" border-style: outset; \n"
" border-width: 2; \n"
"}\n"
"\n"
".button:active {\n"
" background-color: shade (@bg_color, 0.7);\n"
" border-style: inset; \n"
"}\n"
"\n"
".button:prelight,\n"
".slider:prelight {\n"
" background-color: @selected_bg_color;\n"
" color: @selected_fg_color;\n"
" border-color: shade (@selected_bg_color, 0.7);\n"
"}\n"
"\n"
".trough {\n"
" background-color: darker (@bg_color);\n"
" border-style: inset;\n"
" border-width: 1;\n"
" padding: 0;\n"
"}\n"
"\n"
".entry {\n"
" border-style: inset;\n"
" border-width: 2;\n"
" background-color: @base_color;\n"
" color: @text_color;\n"
"}\n"
"\n"
".entry:insensitive {\n"
" background-color: shade (@base_color, 0.9);\n"
" color: shade (@base_color, 0.7);\n"
"}\n"
".entry:active {\n"
" background-color: #c4c2bd;\n"
" color: #000;\n"
"}\n"
"\n"
".progressbar,\n"
".entry.progressbar, \n"
".cell.progressbar {\n"
" background-color: @selected_bg_color;\n"
" border-color: shade (@selected_bg_color, 0.7);\n"
" color: @selected_fg_color;\n"
" border-style: outset;\n"
" border-width: 1;\n"
"}\n"
"\n"
"GtkCheckButton:hover,\n"
"GtkCheckButton:selected,\n"
"GtkRadioButton:hover,\n"
"GtkRadioButton:selected {\n"
" background-color: shade (@bg_color, 1.05);\n"
"}\n"
"\n"
".check, .radio,"
".cell.check, .cell.radio,\n"
".cell.check:hover, .cell.radio:hover {\n"
" border-style: solid;\n"
" border-width: 1;\n"
" background-color: @base_color;\n"
" border-color: @fg_color;\n"
"}\n"
"\n"
".check:active, .radio:active,\n"
".check:hover, .radio:hover {\n"
" background-color: @base_color;\n"
" border-color: @fg_color;\n"
" color: @text_color;\n"
"}\n"
"\n"
".check:selected, .radio:selected {\n"
" background-color: darker (@bg_color);\n"
" color: @selected_fg_color;\n"
" border-color: @selected_fg_color;\n"
"}\n"
"\n"
".check:selected:focused, .radio:selected:focused {\n"
" background-color: @selected_bg_color;\n"
"}\n"
"\n"
".menu.check, .menu.radio {\n"
" color: @fg_color;\n"
" border-style: none;\n"
" border-width: 0;\n"
"}\n"
"\n"
".popup {\n"
" border-style: outset;\n"
" border-width: 1;\n"
"}\n"
"\n"
".viewport {\n"
" border-style: inset;\n"
" border-width: 2;\n"
"}\n"
"\n"
".notebook {\n"
" border-style: outset;\n"
" border-width: 1;\n"
"}\n"
"\n"
".frame {\n"
" border-style: inset;\n"
" border-width: 1;\n"
"}\n"
"\n"
"GtkScrolledWindow.frame {\n"
" padding: 0;\n"
"}\n"
"\n"
".menu,\n"
".menubar,\n"
".toolbar {\n"
" border-style: outset;\n"
" border-width: 1;\n"
"}\n"
"\n"
".menu:hover,\n"
".menubar:hover,\n"
".menu.check:hover,\n"
".menu.radio:hover {\n"
" background-color: @selected_bg_color;\n"
" color: @selected_fg_color;\n"
"}\n"
"\n"
"GtkSpinButton.button {\n"
" border-width: 1;\n"
"}\n"
"\n"
".scale.slider:hover,\n"
"GtkSpinButton.button:hover {\n"
" background-color: shade (@bg_color, 1.05);\n"
" border-color: shade (@bg_color, 0.8);\n"
"}\n"
"\n"
"GtkSwitch.trough:active {\n"
" background-color: @selected_bg_color;\n"
" color: @selected_fg_color;\n"
"}\n"
"\n"
"GtkToggleButton.button:inconsistent {\n"
" border-style: outset;\n"
" border-width: 1px;\n"
" background-color: shade (@bg_color, 0.9);\n"
" border-color: shade (@bg_color, 0.7);\n"
"}\n"
"\n"
"GtkLabel:selected {\n"
" background-color: shade (@bg_color, 0.9);\n"
"}\n"
"\n"
"GtkLabel:selected:focused {\n"
" background-color: @selected_bg_color;\n"
"}\n"
"\n"
".spinner:active {\n"
" transition: 750ms linear loop;\n"
"}\n"
"\n"
".info {\n"
" background-color: @info_bg_color;\n"
" color: @info_fg_color;\n"
"}\n"
"\n"
".warning {\n"
" background-color: @warning_bg_color;\n"
" color: @warning_fg_color;\n"
"}\n"
"\n"
".question {\n"
" background-color: @question_bg_color;\n"
" color: @question_fg_color;\n"
"}\n"
"\n"
".error {\n"
" background-color: @error_bg_color;\n"
" color: @error_fg_color;\n"
"}\n"
"\n"
".highlight {\n"
" background-color: @selected_bg_color;\n"
" color: @selected_fg_color;\n"
"}\n"
"\n"
".light-area-focus {\n"
" color: #000;\n"
"}\n"
"\n"
".dark-area-focus {\n"
" color: #fff;\n"
"}\n"
"GtkCalendar.view {\n"
" border-width: 1;\n"
" border-style: inset;\n"
" padding: 1;\n"
"}\n"
"\n"
"GtkCalendar.view:inconsistent {\n"
" color: darker (@bg_color);\n"
"}\n"
"\n"
"GtkCalendar.header {\n"
" background-color: @bg_color;\n"
" border-style: outset;\n"
" border-width: 2;\n"
"}\n"
"\n"
"GtkCalendar.highlight {\n"
" border-width: 0;\n"
"}\n"
"\n"
"GtkCalendar.button {\n"
" background-color: @bg_color;\n"
"}\n"
"\n"
"GtkCalendar.button:hover {\n"
" background-color: lighter (@bg_color);\n"
" color: @fg_color;\n"
"}\n"
"\n"
".menu * {\n"
" border-width: 0;\n"
" padding: 2;\n"
"}\n"
"\n";
provider = gtk_css_provider_new ();
if (!gtk_css_provider_load_from_data (provider, str, -1, NULL))
{
g_error ("Failed to load the internal default CSS.");
}
}
return provider;
}
gchar *
_gtk_css_provider_get_theme_dir (void)
{
const gchar *var;
gchar *path;
var = g_getenv ("GTK_DATA_PREFIX");
if (var)
path = g_build_filename (var, "share", "themes", NULL);
else
path = g_build_filename (GTK_DATA_PREFIX, "share", "themes", NULL);
return path;
}
/**
* gtk_css_provider_get_named:
* @name: A theme name
* @variant: (allow-none): variant to load, for example, "dark", or
* %NULL for the default
*
* Loads a theme from the usual theme paths
*
* Returns: (transfer none): a #GtkCssProvider with the theme loaded.
* This memory is owned by GTK+, and you must not free it.
*/
GtkCssProvider *
gtk_css_provider_get_named (const gchar *name,
const gchar *variant)
{
static GHashTable *themes = NULL;
GtkCssProvider *provider;
gchar *key;
if (G_UNLIKELY (!themes))
themes = g_hash_table_new (g_str_hash, g_str_equal);
if (variant == NULL)
key = (gchar *)name;
else
key = g_strconcat (name, "-", variant, NULL);
provider = g_hash_table_lookup (themes, key);
if (!provider)
{
const gchar *home_dir;
gchar *subpath, *path = NULL;
if (variant)
subpath = g_strdup_printf ("gtk-3.0" G_DIR_SEPARATOR_S "gtk-%s.css", variant);
else
subpath = g_strdup ("gtk-3.0" G_DIR_SEPARATOR_S "gtk.css");
/* First look in the users home directory
*/
home_dir = g_get_home_dir ();
if (home_dir)
{
path = g_build_filename (home_dir, ".themes", name, subpath, NULL);
if (!g_file_test (path, G_FILE_TEST_EXISTS))
{
g_free (path);
path = NULL;
}
}
if (!path)
{
gchar *theme_dir;
theme_dir = _gtk_css_provider_get_theme_dir ();
path = g_build_filename (theme_dir, name, subpath, NULL);
g_free (theme_dir);
if (!g_file_test (path, G_FILE_TEST_EXISTS))
{
g_free (path);
path = NULL;
}
}
g_free (subpath);
if (path)
{
GError *error;
provider = gtk_css_provider_new ();
error = NULL;
if (!gtk_css_provider_load_from_path (provider, path, &error))
{
g_warning ("Could not load named theme \"%s\": %s", name, error->message);
g_error_free (error);
g_object_unref (provider);
provider = NULL;
}
else
g_hash_table_insert (themes, g_strdup (key), provider);
g_free (path);
}
}
if (key != name)
g_free (key);
return provider;
}
static void
selector_path_print (const SelectorPath *path,
GString * str)
{
GSList *walk, *reverse;
reverse = g_slist_copy (path->elements);
reverse = g_slist_reverse (reverse);
for (walk = reverse; walk; walk = walk->next)
{
SelectorElement *elem = walk->data;
switch (elem->elem_type)
{
case SELECTOR_TYPE_NAME:
case SELECTOR_NAME:
g_string_append (str, g_quark_to_string (elem->name));
break;
case SELECTOR_GTYPE:
g_string_append (str, g_type_name (elem->type));
break;
case SELECTOR_REGION:
g_string_append (str, g_quark_to_string (elem->region.name));
if (elem->region.flags)
{
char * flag_names[] = {
"nth-child(even)",
"nth-child(odd)",
"first-child",
"last-child",
"sorted"
};
guint i;
for (i = 0; i < G_N_ELEMENTS (flag_names); i++)
{
if (elem->region.flags & (1 << i))
{
g_string_append_c (str, ':');
g_string_append (str, flag_names[i]);
}
}
}
break;
case SELECTOR_CLASS:
g_string_append_c (str, '.');
g_string_append (str, g_quark_to_string (elem->name));
break;
case SELECTOR_GLOB:
if (walk->next == NULL ||
elem->combinator != COMBINATOR_CHILD ||
((SelectorElement *) walk->next->data)->elem_type != SELECTOR_CLASS)
g_string_append (str, "*");
break;
default:
g_assert_not_reached ();
}
if (walk->next)
{
switch (elem->combinator)
{
case COMBINATOR_DESCENDANT:
if (elem->elem_type != SELECTOR_CLASS ||
((SelectorElement *) walk->next->data)->elem_type != SELECTOR_CLASS)
g_string_append_c (str, ' ');
break;
case COMBINATOR_CHILD:
if (((SelectorElement *) walk->next->data)->elem_type != SELECTOR_CLASS)
g_string_append (str, " > ");
break;
default:
g_assert_not_reached ();
}
}
}
if (path->state)
{
char * state_names[] = {
"active",
"hover",
"selected",
"insensitive",
"inconsistent",
"focus"
};
guint i;
for (i = 0; i < G_N_ELEMENTS (state_names); i++)
{
if (path->state & (1 << i))
{
g_string_append_c (str, ':');
g_string_append (str, state_names[i]);
}
}
}
g_slist_free (reverse);
}
static void
selector_style_info_print (const SelectorStyleInfo *info,
GString *str)
{
GList *keys, *walk;
char *s;
selector_path_print (info->path, str);
g_string_append (str, " {\n");
keys = g_hash_table_get_keys (info->style);
/* so the output is identical for identical selector styles */
keys = g_list_sort (keys, (GCompareFunc) strcmp);
for (walk = keys; walk; walk = walk->next)
{
const char *name = walk->data;
const GValue *value = g_hash_table_lookup (info->style, (gpointer) name);
g_string_append (str, " ");
g_string_append (str, name);
g_string_append (str, ": ");
s = _gtk_css_value_to_string (value);
g_string_append (str, s);
g_free (s);
g_string_append (str, ";\n");
}
g_list_free (keys);
g_string_append (str, "}\n");
}
static void
gtk_css_provider_print_colors (GHashTable *colors,
GString *str)
{
GList *keys, *walk;
char *s;
keys = g_hash_table_get_keys (colors);
/* so the output is identical for identical styles */
keys = g_list_sort (keys, (GCompareFunc) strcmp);
for (walk = keys; walk; walk = walk->next)
{
const char *name = walk->data;
GtkSymbolicColor *symbolic = g_hash_table_lookup (colors, (gpointer) name);
g_string_append (str, "@define-color ");
g_string_append (str, name);
g_string_append (str, " ");
s = gtk_symbolic_color_to_string (symbolic);
g_string_append (str, s);
g_free (s);
g_string_append (str, ";\n");
}
g_list_free (keys);
}
/**
* gtk_css_provider_to_string:
* @provider: the provider to write to a string
*
* Convertes the @provider into a string representation in CSS
* format.
*
* Using gtk_css_provider_load_from_data() with the return value
* from this function on a new provider created with
* gtk_css_provider_new() will basicallu create a duplicate of
* this @provider.
*
* Returns: a new string representing the @provider.
**/
char *
gtk_css_provider_to_string (GtkCssProvider *provider)
{
GtkCssProviderPrivate *priv;
GString *str;
guint i;
g_return_val_if_fail (GTK_IS_CSS_PROVIDER (provider), NULL);
priv = provider->priv;
str = g_string_new ("");
gtk_css_provider_print_colors (priv->symbolic_colors, str);
for (i = 0; i < priv->selectors_info->len; i++)
{
if (i > 0)
g_string_append (str, "\n");
selector_style_info_print (g_ptr_array_index (priv->selectors_info, i),
str);
}
return g_string_free (str, FALSE);
}
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