gtkcssstylefuncs.c 32.2 KB
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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
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 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
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 */

#include "config.h"

#include "gtkcssstylefuncsprivate.h"

#include <errno.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>

#include <gdk-pixbuf/gdk-pixbuf.h>
#include <cairo-gobject.h>

#include "gtkanimationdescription.h"
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#include "gtkcssimagegradientprivate.h"
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#include "gtkcssprovider.h"
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#include "gtkcssrgbavalueprivate.h"
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#include "gtkcsstypesprivate.h"
#include "gtkgradient.h"
#include "gtkprivatetypebuiltins.h"
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#include "gtkcssshadowvalueprivate.h"
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#include "gtkstylecontextprivate.h"
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#include "gtksymboliccolorprivate.h"
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#include "gtkthemingengine.h"
#include "gtktypebuiltins.h"
#include "gtkwin32themeprivate.h"

/* this is in case round() is not provided by the compiler, 
 * such as in the case of C89 compilers, like MSVC
 */
#include "fallback-c89.c"

static GHashTable *parse_funcs = NULL;
static GHashTable *print_funcs = NULL;
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static GHashTable *compute_funcs = NULL;
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typedef gboolean         (* GtkStyleParseFunc)             (GtkCssParser           *parser,
                                                            GFile                  *base,
                                                            GValue                 *value);
typedef void             (* GtkStylePrintFunc)             (const GValue           *value,
                                                            GString                *string);
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typedef GtkCssValue *    (* GtkStyleComputeFunc)           (GtkStyleContext        *context,
                                                            GtkCssValue            *specified);
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static void
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register_conversion_function (GType               type,
                              GtkStyleParseFunc   parse,
                              GtkStylePrintFunc   print,
                              GtkStyleComputeFunc compute)
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{
  if (parse)
    g_hash_table_insert (parse_funcs, GSIZE_TO_POINTER (type), parse);
  if (print)
    g_hash_table_insert (print_funcs, GSIZE_TO_POINTER (type), print);
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  if (compute)
    g_hash_table_insert (compute_funcs, GSIZE_TO_POINTER (type), compute);
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}

static void
string_append_double (GString *string,
                      double   d)
{
  char buf[G_ASCII_DTOSTR_BUF_SIZE];

  g_ascii_dtostr (buf, sizeof (buf), d);
  g_string_append (string, buf);
}

static void
string_append_string (GString    *str,
                      const char *string)
{
  gsize len;

  g_string_append_c (str, '"');

  do {
    len = strcspn (string, "\"\n\r\f");
    g_string_append (str, string);
    string += len;
    switch (*string)
      {
      case '\0':
        break;
      case '\n':
        g_string_append (str, "\\A ");
        break;
      case '\r':
        g_string_append (str, "\\D ");
        break;
      case '\f':
        g_string_append (str, "\\C ");
        break;
      case '\"':
        g_string_append (str, "\\\"");
        break;
      default:
        g_assert_not_reached ();
        break;
      }
  } while (*string);

  g_string_append_c (str, '"');
}

/*** IMPLEMENTATIONS ***/

static gboolean 
enum_parse (GtkCssParser *parser,
	    GType         type,
	    int          *res)
{
  char *str;

  if (_gtk_css_parser_try_enum (parser, type, res))
    return TRUE;

  str = _gtk_css_parser_try_ident (parser, TRUE);
  if (str == NULL)
    {
      _gtk_css_parser_error (parser, "Expected an identifier");
      return FALSE;
    }

  _gtk_css_parser_error (parser,
			 "Unknown value '%s' for enum type '%s'",
			 str, g_type_name (type));
  g_free (str);

  return FALSE;
}

static void
enum_print (int         value,
	    GType       type,
	    GString    *string)
{
  GEnumClass *enum_class;
  GEnumValue *enum_value;

  enum_class = g_type_class_ref (type);
  enum_value = g_enum_get_value (enum_class, value);

  g_string_append (string, enum_value->value_nick);

  g_type_class_unref (enum_class);
}

static gboolean
rgba_value_parse (GtkCssParser *parser,
                  GFile        *base,
                  GValue       *value)
{
  GtkSymbolicColor *symbolic;
  GdkRGBA rgba;

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  if (_gtk_css_parser_try (parser, "currentcolor", TRUE))
    {
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      symbolic = gtk_symbolic_color_ref (_gtk_symbolic_color_get_current_color ());
    }
  else
    {
      symbolic = _gtk_css_parser_read_symbolic_color (parser);
      if (symbolic == NULL)
        return FALSE;
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    }
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  if (gtk_symbolic_color_resolve (symbolic, NULL, &rgba))
    {
      g_value_set_boxed (value, &rgba);
      gtk_symbolic_color_unref (symbolic);
    }
  else
    {
      g_value_unset (value);
      g_value_init (value, GTK_TYPE_SYMBOLIC_COLOR);
      g_value_take_boxed (value, symbolic);
    }

  return TRUE;
}

static void
rgba_value_print (const GValue *value,
                  GString      *string)
{
  const GdkRGBA *rgba = g_value_get_boxed (value);

  if (rgba == NULL)
    g_string_append (string, "none");
  else
    {
      char *s = gdk_rgba_to_string (rgba);
      g_string_append (string, s);
      g_free (s);
    }
}

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static GtkCssValue *
rgba_value_compute (GtkStyleContext *context,
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                    GtkCssValue     *specified)
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{
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  GdkRGBA white = { 1, 1, 1, 1 };
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  if (_gtk_css_value_holds (specified, GTK_TYPE_SYMBOLIC_COLOR))
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    {
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      GtkSymbolicColor *symbolic = _gtk_css_value_get_symbolic_color (specified);
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      GdkRGBA rgba;
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      if (symbolic == _gtk_symbolic_color_get_current_color ())
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        rgba = *_gtk_css_rgba_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR));
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      else if (!gtk_symbolic_color_resolve (symbolic, NULL, &rgba))
        rgba = white;
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      return _gtk_css_value_new_from_boxed (GDK_TYPE_RGBA, &rgba);
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    }
  else
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    return _gtk_css_value_ref (specified);
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}

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static gboolean 
color_value_parse (GtkCssParser *parser,
                   GFile        *base,
                   GValue       *value)
{
  GtkSymbolicColor *symbolic;
  GdkRGBA rgba;

  symbolic = _gtk_css_parser_read_symbolic_color (parser);
  if (symbolic == NULL)
    return FALSE;

  if (gtk_symbolic_color_resolve (symbolic, NULL, &rgba))
    {
      GdkColor color;

      color.red = rgba.red * 65535. + 0.5;
      color.green = rgba.green * 65535. + 0.5;
      color.blue = rgba.blue * 65535. + 0.5;

      g_value_set_boxed (value, &color);
    }
  else
    {
      g_value_unset (value);
      g_value_init (value, GTK_TYPE_SYMBOLIC_COLOR);
      g_value_take_boxed (value, symbolic);
    }

  return TRUE;
}

static void
color_value_print (const GValue *value,
                   GString      *string)
{
  const GdkColor *color = g_value_get_boxed (value);

  if (color == NULL)
    g_string_append (string, "none");
  else
    {
      char *s = gdk_color_to_string (color);
      g_string_append (string, s);
      g_free (s);
    }
}

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static GtkCssValue *
color_value_compute (GtkStyleContext *context,
                     GtkCssValue    *specified)
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{
  GdkRGBA rgba;
  GdkColor color = { 0, 65535, 65535, 65535 };

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  if (_gtk_css_value_holds (specified, GTK_TYPE_SYMBOLIC_COLOR))
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    {
      if (_gtk_style_context_resolve_color (context,
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                                            _gtk_css_value_get_symbolic_color (specified),
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                                            &rgba))
        {
          color.red = rgba.red * 65535. + 0.5;
          color.green = rgba.green * 65535. + 0.5;
          color.blue = rgba.blue * 65535. + 0.5;
        }
      
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      return _gtk_css_value_new_from_color (&color);
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    }
  else
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    return _gtk_css_value_ref (specified);
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}

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static gboolean
symbolic_color_value_parse (GtkCssParser *parser,
                            GFile        *base,
                            GValue       *value)
{
  GtkSymbolicColor *symbolic;

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  if (_gtk_css_parser_try (parser, "currentcolor", TRUE))
    {
      symbolic = gtk_symbolic_color_ref (_gtk_symbolic_color_get_current_color ());
    }
  else
    {
      symbolic = _gtk_css_parser_read_symbolic_color (parser);
      if (symbolic == NULL)
        return FALSE;
    }
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  g_value_take_boxed (value, symbolic);
  return TRUE;
}

static void
symbolic_color_value_print (const GValue *value,
                            GString      *string)
{
  GtkSymbolicColor *symbolic = g_value_get_boxed (value);

  if (symbolic == NULL)
    g_string_append (string, "none");
  else
    {
      char *s = gtk_symbolic_color_to_string (symbolic);
      g_string_append (string, s);
      g_free (s);
    }
}

static gboolean 
font_description_value_parse (GtkCssParser *parser,
                              GFile        *base,
                              GValue       *value)
{
  PangoFontDescription *font_desc;
  guint mask;
  char *str;

  str = _gtk_css_parser_read_value (parser);
  if (str == NULL)
    return FALSE;

  font_desc = pango_font_description_from_string (str);
  mask = pango_font_description_get_set_fields (font_desc);
  /* These values are not really correct,
   * but the fields must be set, so we set them to something */
  if ((mask & PANGO_FONT_MASK_FAMILY) == 0)
    pango_font_description_set_family_static (font_desc, "Sans");
  if ((mask & PANGO_FONT_MASK_SIZE) == 0)
    pango_font_description_set_size (font_desc, 10 * PANGO_SCALE);
  g_free (str);
  g_value_take_boxed (value, font_desc);
  return TRUE;
}

static void
font_description_value_print (const GValue *value,
                              GString      *string)
{
  const PangoFontDescription *desc = g_value_get_boxed (value);

  if (desc == NULL)
    g_string_append (string, "none");
  else
    {
      char *s = pango_font_description_to_string (desc);
      g_string_append (string, s);
      g_free (s);
    }
}

static gboolean 
boolean_value_parse (GtkCssParser *parser,
                     GFile        *base,
                     GValue       *value)
{
  if (_gtk_css_parser_try (parser, "true", TRUE) ||
      _gtk_css_parser_try (parser, "1", TRUE))
    {
      g_value_set_boolean (value, TRUE);
      return TRUE;
    }
  else if (_gtk_css_parser_try (parser, "false", TRUE) ||
           _gtk_css_parser_try (parser, "0", TRUE))
    {
      g_value_set_boolean (value, FALSE);
      return TRUE;
    }
  else
    {
      _gtk_css_parser_error (parser, "Expected a boolean value");
      return FALSE;
    }
}

static void
boolean_value_print (const GValue *value,
                     GString      *string)
{
  if (g_value_get_boolean (value))
    g_string_append (string, "true");
  else
    g_string_append (string, "false");
}

static gboolean 
int_value_parse (GtkCssParser *parser,
                 GFile        *base,
                 GValue       *value)
{
  gint i;

  if (_gtk_css_parser_begins_with (parser, '-'))
    {
      int res = _gtk_win32_theme_int_parse (parser, base, &i);
      if (res >= 0)
	{
	  g_value_set_int (value, i);
	  return res > 0;
	}
      /* < 0 => continue */
    }

  if (!_gtk_css_parser_try_int (parser, &i))
    {
      _gtk_css_parser_error (parser, "Expected a valid integer value");
      return FALSE;
    }

  g_value_set_int (value, i);
  return TRUE;
}

static void
int_value_print (const GValue *value,
                 GString      *string)
{
  g_string_append_printf (string, "%d", g_value_get_int (value));
}

static gboolean 
uint_value_parse (GtkCssParser *parser,
                  GFile        *base,
                  GValue       *value)
{
  guint u;

  if (!_gtk_css_parser_try_uint (parser, &u))
    {
      _gtk_css_parser_error (parser, "Expected a valid unsigned value");
      return FALSE;
    }

  g_value_set_uint (value, u);
  return TRUE;
}

static void
uint_value_print (const GValue *value,
                  GString      *string)
{
  g_string_append_printf (string, "%u", g_value_get_uint (value));
}

static gboolean 
double_value_parse (GtkCssParser *parser,
                    GFile        *base,
                    GValue       *value)
{
  gdouble d;

  if (!_gtk_css_parser_try_double (parser, &d))
    {
      _gtk_css_parser_error (parser, "Expected a number");
      return FALSE;
    }

  g_value_set_double (value, d);
  return TRUE;
}

static void
double_value_print (const GValue *value,
                    GString      *string)
{
  string_append_double (string, g_value_get_double (value));
}

static gboolean 
float_value_parse (GtkCssParser *parser,
                   GFile        *base,
                   GValue       *value)
{
  gdouble d;

  if (!_gtk_css_parser_try_double (parser, &d))
    {
      _gtk_css_parser_error (parser, "Expected a number");
      return FALSE;
    }

  g_value_set_float (value, d);
  return TRUE;
}

static void
float_value_print (const GValue *value,
                   GString      *string)
{
  string_append_double (string, g_value_get_float (value));
}

static gboolean 
string_value_parse (GtkCssParser *parser,
                    GFile        *base,
                    GValue       *value)
{
  char *str = _gtk_css_parser_read_string (parser);

  if (str == NULL)
    return FALSE;

  g_value_take_string (value, str);
  return TRUE;
}

static void
string_value_print (const GValue *value,
                    GString      *str)
{
  string_append_string (str, g_value_get_string (value));
}

static gboolean 
theming_engine_value_parse (GtkCssParser *parser,
                            GFile        *base,
                            GValue       *value)
{
  GtkThemingEngine *engine;
  char *str;

  if (_gtk_css_parser_try (parser, "none", TRUE))
    {
      g_value_set_object (value, gtk_theming_engine_load (NULL));
      return TRUE;
    }

  str = _gtk_css_parser_try_ident (parser, TRUE);
  if (str == NULL)
    {
      _gtk_css_parser_error (parser, "Expected a valid theme name");
      return FALSE;
    }

  engine = gtk_theming_engine_load (str);

  if (engine == NULL)
    {
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      _gtk_css_parser_error (parser, "Theming engine '%s' not found", str);
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      g_free (str);
      return FALSE;
    }

  g_value_set_object (value, engine);
  g_free (str);
  return TRUE;
}

static void
theming_engine_value_print (const GValue *value,
                            GString      *string)
{
  GtkThemingEngine *engine;
  char *name;

  engine = g_value_get_object (value);
  if (engine == NULL)
    g_string_append (string, "none");
  else
    {
      /* XXX: gtk_theming_engine_get_name()? */
      g_object_get (engine, "name", &name, NULL);
      g_string_append (string, name ? name : "none");
      g_free (name);
    }
}

static gboolean 
animation_description_value_parse (GtkCssParser *parser,
                                   GFile        *base,
                                   GValue       *value)
{
  GtkAnimationDescription *desc;
  char *str;

  str = _gtk_css_parser_read_value (parser);
  if (str == NULL)
    return FALSE;

  desc = _gtk_animation_description_from_string (str);
  g_free (str);

  if (desc == NULL)
    {
      _gtk_css_parser_error (parser, "Invalid animation description");
      return FALSE;
    }
  
  g_value_take_boxed (value, desc);
  return TRUE;
}

static void
animation_description_value_print (const GValue *value,
                                   GString      *string)
{
  GtkAnimationDescription *desc = g_value_get_boxed (value);

  if (desc == NULL)
    g_string_append (string, "none");
  else
    _gtk_animation_description_print (desc, string);
}

static gboolean 
border_value_parse (GtkCssParser *parser,
                    GFile        *base,
                    GValue       *value)
{
  GtkBorder border = { 0, };
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  guint i;
  int numbers[4];
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  for (i = 0; i < G_N_ELEMENTS (numbers); i++)
    {
      if (_gtk_css_parser_begins_with (parser, '-'))
	{
	  /* These are strictly speaking signed, but we want to be able to use them
	     for unsigned types too, as the actual ranges of values make this safe */
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	  int res = _gtk_win32_theme_int_parse (parser, base, &numbers[i]);
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	  if (res == 0) /* Parse error, report */
	    return FALSE;

	  if (res < 0) /* Nothing known to expand */
	    break;
	}
      else
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        {
          if (!_gtk_css_parser_try_length (parser, &numbers[i]))
            break;
        }
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    }

  if (i == 0)
    {
      _gtk_css_parser_error (parser, "Expected valid border");
      return FALSE;
    }

  border.top = numbers[0];
  if (i > 1)
    border.right = numbers[1];
  else
    border.right = border.top;
  if (i > 2)
    border.bottom = numbers[2];
  else
    border.bottom = border.top;
  if (i > 3)
    border.left = numbers[3];
  else
    border.left = border.right;

  g_value_set_boxed (value, &border);
  return TRUE;
}

static void
border_value_print (const GValue *value, GString *string)
{
  const GtkBorder *border = g_value_get_boxed (value);

  if (border == NULL)
    g_string_append (string, "none");
  else if (border->left != border->right)
    g_string_append_printf (string, "%d %d %d %d", border->top, border->right, border->bottom, border->left);
  else if (border->top != border->bottom)
    g_string_append_printf (string, "%d %d %d", border->top, border->right, border->bottom);
  else if (border->top != border->left)
    g_string_append_printf (string, "%d %d", border->top, border->right);
  else
    g_string_append_printf (string, "%d", border->top);
}

static gboolean 
gradient_value_parse (GtkCssParser *parser,
                      GFile        *base,
                      GValue       *value)
{
  GtkGradient *gradient;

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  gradient = _gtk_gradient_parse (parser);
  if (gradient == NULL)
    return FALSE;
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  g_value_take_boxed (value, gradient);
  return TRUE;
}

static void
gradient_value_print (const GValue *value,
                      GString      *string)
{
  GtkGradient *gradient = g_value_get_boxed (value);

  if (gradient == NULL)
    g_string_append (string, "none");
  else
    {
      char *s = gtk_gradient_to_string (gradient);
      g_string_append (string, s);
      g_free (s);
    }
}

static gboolean 
pattern_value_parse (GtkCssParser *parser,
                     GFile        *base,
                     GValue       *value)
{
  if (_gtk_css_parser_try (parser, "none", TRUE))
    {
      /* nothing to do here */
    }
  else if (_gtk_css_parser_begins_with (parser, '-'))
    {
      g_value_unset (value);
      g_value_init (value, GTK_TYPE_GRADIENT);
      return gradient_value_parse (parser, base, value);
    }
  else
    {
      GError *error = NULL;
      gchar *path;
      GdkPixbuf *pixbuf;
      GFile *file;
      cairo_surface_t *surface;
      cairo_pattern_t *pattern;
      cairo_t *cr;
      cairo_matrix_t matrix;

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      file = _gtk_css_parser_read_url (parser, base);
771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873
      if (file == NULL)
        return FALSE;

      path = g_file_get_path (file);
      g_object_unref (file);

      pixbuf = gdk_pixbuf_new_from_file (path, &error);
      g_free (path);
      if (pixbuf == NULL)
        {
          _gtk_css_parser_take_error (parser, error);
          return FALSE;
        }

      surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
                                            gdk_pixbuf_get_width (pixbuf),
                                            gdk_pixbuf_get_height (pixbuf));
      cr = cairo_create (surface);
      gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
      cairo_paint (cr);
      pattern = cairo_pattern_create_for_surface (surface);

      cairo_matrix_init_scale (&matrix,
                               gdk_pixbuf_get_width (pixbuf),
                               gdk_pixbuf_get_height (pixbuf));
      cairo_pattern_set_matrix (pattern, &matrix);

      cairo_surface_destroy (surface);
      cairo_destroy (cr);
      g_object_unref (pixbuf);

      g_value_take_boxed (value, pattern);
    }
  
  return TRUE;
}

static cairo_status_t
surface_write (void                *closure,
               const unsigned char *data,
               unsigned int         length)
{
  g_byte_array_append (closure, data, length);

  return CAIRO_STATUS_SUCCESS;
}

static void
surface_print (cairo_surface_t *surface,
               GString *        string)
{
#if CAIRO_HAS_PNG_FUNCTIONS
  GByteArray *array;
  char *base64;
  
  array = g_byte_array_new ();
  cairo_surface_write_to_png_stream (surface, surface_write, array);
  base64 = g_base64_encode (array->data, array->len);
  g_byte_array_free (array, TRUE);

  g_string_append (string, "url(\"data:image/png;base64,");
  g_string_append (string, base64);
  g_string_append (string, "\")");

  g_free (base64);
#else
  g_string_append (string, "none /* you need cairo png functions enabled to make this work */");
#endif
}

static void
pattern_value_print (const GValue *value,
                     GString      *string)
{
  cairo_pattern_t *pattern;
  cairo_surface_t *surface;

  pattern = g_value_get_boxed (value);

  if (pattern == NULL)
    {
      g_string_append (string, "none");
      return;
    }

  switch (cairo_pattern_get_type (pattern))
    {
    case CAIRO_PATTERN_TYPE_SURFACE:
      if (cairo_pattern_get_surface (pattern, &surface) != CAIRO_STATUS_SUCCESS)
        {
          g_assert_not_reached ();
        }
      surface_print (surface, string);
      break;
    case CAIRO_PATTERN_TYPE_SOLID:
    case CAIRO_PATTERN_TYPE_LINEAR:
    case CAIRO_PATTERN_TYPE_RADIAL:
    default:
      g_assert_not_reached ();
      break;
    }
}

874 875 876
static GtkCssValue *
pattern_value_compute (GtkStyleContext *context,
                       GtkCssValue     *specified)
877
{
878
  if (_gtk_css_value_holds (specified, GTK_TYPE_GRADIENT))
879 880 881
    {
      cairo_pattern_t *gradient;
      
882
      gradient = gtk_gradient_resolve_for_context (_gtk_css_value_get_gradient (specified), context);
883

884
      return _gtk_css_value_new_take_pattern (gradient);
885 886
    }
  else
887
    return _gtk_css_value_ref (specified);
888 889
}

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static gboolean
border_image_repeat_value_parse (GtkCssParser *parser,
                                 GFile *file,
                                 GValue *value)
{
  GtkCssBorderImageRepeat image_repeat;
  GtkCssBorderRepeatStyle styles[2];
  gint i, v;

  for (i = 0; i < 2; i++)
    {
      if (_gtk_css_parser_try_enum (parser, GTK_TYPE_CSS_BORDER_REPEAT_STYLE, &v))
        styles[i] = v;
      else if (i == 0)
        {
          styles[1] = styles[0] = GTK_CSS_REPEAT_STYLE_STRETCH;
          break;
        }
      else
        styles[i] = styles[0];
    }

  image_repeat.hrepeat = styles[0];
  image_repeat.vrepeat = styles[1];

  g_value_set_boxed (value, &image_repeat);

  return TRUE;
}

static void
border_image_repeat_value_print (const GValue *value,
                                 GString      *string)
{
  GtkCssBorderImageRepeat *image_repeat;

  image_repeat = g_value_get_boxed (value);

  enum_print (image_repeat->hrepeat, GTK_TYPE_CSS_BORDER_REPEAT_STYLE, string);
  if (image_repeat->hrepeat != image_repeat->vrepeat)
    {
      g_string_append (string, " ");
      enum_print (image_repeat->vrepeat, GTK_TYPE_CSS_BORDER_REPEAT_STYLE, string);
    }
}

static gboolean 
enum_value_parse (GtkCssParser *parser,
                  GFile        *base,
                  GValue       *value)
{
  int v;

  if (enum_parse (parser, G_VALUE_TYPE (value), &v))
    {
      g_value_set_enum (value, v);
      return TRUE;
    }

  return FALSE;
}

static void
enum_value_print (const GValue *value,
                  GString      *string)
{
  enum_print (g_value_get_enum (value), G_VALUE_TYPE (value), string);
}

static gboolean 
flags_value_parse (GtkCssParser *parser,
                   GFile        *base,
                   GValue       *value)
{
  GFlagsClass *flags_class;
  GFlagsValue *flag_value;
  guint flags = 0;
  char *str;

  flags_class = g_type_class_ref (G_VALUE_TYPE (value));

  do {
    str = _gtk_css_parser_try_ident (parser, TRUE);
    if (str == NULL)
      {
        _gtk_css_parser_error (parser, "Expected an identifier");
        g_type_class_unref (flags_class);
        return FALSE;
      }

      flag_value = g_flags_get_value_by_nick (flags_class, str);
      if (!flag_value)
        {
          _gtk_css_parser_error (parser,
                                 "Unknown flag value '%s' for type '%s'",
                                 str, g_type_name (G_VALUE_TYPE (value)));
          /* XXX Do we want to return FALSE here? We can get
           * forward-compatibility for new values this way
           */
          g_free (str);
          g_type_class_unref (flags_class);
          return FALSE;
        }

      g_free (str);
    }
  while (_gtk_css_parser_try (parser, ",", FALSE));

  g_type_class_unref (flags_class);

  g_value_set_enum (value, flags);

  return TRUE;
}

static void
flags_value_print (const GValue *value,
                   GString      *string)
{
  GFlagsClass *flags_class;
  guint i, flags;

  flags_class = g_type_class_ref (G_VALUE_TYPE (value));
  flags = g_value_get_flags (value);

  for (i = 0; i < flags_class->n_values; i++)
    {
      GFlagsValue *flags_value = &flags_class->values[i];

      if (flags & flags_value->value)
        {
          if (string->len != 0)
            g_string_append (string, ", ");

          g_string_append (string, flags_value->value_nick);
        }
    }

  g_type_class_unref (flags_class);
}

/*** API ***/

static void
gtk_css_style_funcs_init (void)
{
  if (G_LIKELY (parse_funcs != NULL))
    return;

  parse_funcs = g_hash_table_new (NULL, NULL);
  print_funcs = g_hash_table_new (NULL, NULL);
1041
  compute_funcs = g_hash_table_new (NULL, NULL);
1042 1043 1044

  register_conversion_function (GDK_TYPE_RGBA,
                                rgba_value_parse,
1045 1046
                                rgba_value_print,
                                rgba_value_compute);
1047 1048
  register_conversion_function (GDK_TYPE_COLOR,
                                color_value_parse,
1049 1050
                                color_value_print,
                                color_value_compute);
1051 1052
  register_conversion_function (GTK_TYPE_SYMBOLIC_COLOR,
                                symbolic_color_value_parse,
1053 1054
                                symbolic_color_value_print,
                                NULL);
1055 1056
  register_conversion_function (PANGO_TYPE_FONT_DESCRIPTION,
                                font_description_value_parse,
1057 1058
                                font_description_value_print,
                                NULL);
1059 1060
  register_conversion_function (G_TYPE_BOOLEAN,
                                boolean_value_parse,
1061 1062
                                boolean_value_print,
                                NULL);
1063 1064
  register_conversion_function (G_TYPE_INT,
                                int_value_parse,
1065 1066
                                int_value_print,
                                NULL);
1067 1068
  register_conversion_function (G_TYPE_UINT,
                                uint_value_parse,
1069 1070
                                uint_value_print,
                                NULL);
1071 1072
  register_conversion_function (G_TYPE_DOUBLE,
                                double_value_parse,
1073 1074
                                double_value_print,
                                NULL);
1075 1076
  register_conversion_function (G_TYPE_FLOAT,
                                float_value_parse,
1077 1078
                                float_value_print,
                                NULL);
1079 1080
  register_conversion_function (G_TYPE_STRING,
                                string_value_parse,
1081 1082
                                string_value_print,
                                NULL);
1083 1084
  register_conversion_function (GTK_TYPE_THEMING_ENGINE,
                                theming_engine_value_parse,
1085 1086
                                theming_engine_value_print,
                                NULL);
1087 1088
  register_conversion_function (GTK_TYPE_ANIMATION_DESCRIPTION,
                                animation_description_value_parse,
1089 1090
                                animation_description_value_print,
                                NULL);
1091 1092
  register_conversion_function (GTK_TYPE_BORDER,
                                border_value_parse,
1093 1094
                                border_value_print,
                                NULL);
1095 1096
  register_conversion_function (GTK_TYPE_GRADIENT,
                                gradient_value_parse,
1097 1098
                                gradient_value_print,
                                NULL);
1099 1100
  register_conversion_function (CAIRO_GOBJECT_TYPE_PATTERN,
                                pattern_value_parse,
1101 1102
                                pattern_value_print,
                                pattern_value_compute);
1103 1104
  register_conversion_function (GTK_TYPE_CSS_BORDER_IMAGE_REPEAT,
                                border_image_repeat_value_parse,
1105 1106
                                border_image_repeat_value_print,
                                NULL);
1107 1108
  register_conversion_function (G_TYPE_ENUM,
                                enum_value_parse,
1109 1110
                                enum_value_print,
                                NULL);
1111 1112
  register_conversion_function (G_TYPE_FLAGS,
                                flags_value_parse,
1113 1114
                                flags_value_print,
                                NULL);
1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190
}

/**
 * _gtk_css_style_parse_value:
 * @value: the value to parse into. Must be a valid initialized #GValue
 * @parser: the parser to parse from
 * @base: the base URL for @parser
 *
 * This is the generic parsing function used for CSS values. If the
 * function fails to parse a value, it will emit an error on @parser,
 * return %FALSE and not touch @value.
 *
 * Returns: %TRUE if parsing succeeded.
 **/
gboolean
_gtk_css_style_parse_value (GValue       *value,
                            GtkCssParser *parser,
                            GFile        *base)
{
  GtkStyleParseFunc func;

  g_return_val_if_fail (value != NULL, FALSE);
  g_return_val_if_fail (parser != NULL, FALSE);

  gtk_css_style_funcs_init ();

  func = g_hash_table_lookup (parse_funcs,
                              GSIZE_TO_POINTER (G_VALUE_TYPE (value)));
  if (func == NULL)
    func = g_hash_table_lookup (parse_funcs,
                                GSIZE_TO_POINTER (g_type_fundamental (G_VALUE_TYPE (value))));

  if (func == NULL)
    {
      _gtk_css_parser_error (parser,
                             "Cannot convert to type '%s'",
                             g_type_name (G_VALUE_TYPE (value)));
      return FALSE;
    }

  return (*func) (parser, base, value);
}

/**
 * _gtk_css_style_print_value:
 * @value: an initialized GValue returned from _gtk_css_style_parse()
 * @string: the string to print into
 *
 * Prints @value into @string as a CSS value. If @value is not a
 * valid value, a random string will be printed instead.
 **/
void
_gtk_css_style_print_value (const GValue *value,
                            GString      *string)
{
  GtkStylePrintFunc func;

  gtk_css_style_funcs_init ();

  func = g_hash_table_lookup (print_funcs,
                              GSIZE_TO_POINTER (G_VALUE_TYPE (value)));
  if (func == NULL)
    func = g_hash_table_lookup (print_funcs,
                                GSIZE_TO_POINTER (g_type_fundamental (G_VALUE_TYPE (value))));

  if (func == NULL)
    {
      char *s = g_strdup_value_contents (value);
      g_string_append (string, s);
      g_free (s);
      return;
    }
  
  func (value, string);
}

1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201
/**
 * _gtk_css_style_compute_value:
 * @computed: (out): a value to be filled with the result
 * @context: the context to use for computing the value
 * @specified: the value to use for the computation
 *
 * Converts the @specified value into the @computed value using the
 * information in @context. The values must have matching types, ie
 * @specified must be a result of a call to
 * _gtk_css_style_parse_value() with the same type as @computed.
 **/
1202 1203 1204 1205
GtkCssValue *
_gtk_css_style_compute_value (GtkStyleContext *context,
			      GType           target_type,
                              GtkCssValue    *specified)
1206 1207 1208
{
  GtkStyleComputeFunc func;

1209
  g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
1210 1211 1212 1213

  gtk_css_style_funcs_init ();

  func = g_hash_table_lookup (compute_funcs,
1214
                              GSIZE_TO_POINTER (target_type));
1215 1216
  if (func == NULL)
    func = g_hash_table_lookup (compute_funcs,
1217
                                GSIZE_TO_POINTER (g_type_fundamental (target_type)));
1218 1219

  if (func)
1220
    return func (context, specified);
1221
  else
1222
    return _gtk_css_value_ref (specified);
1223 1224
}