gtk2/gtk/gtkcsscalcvalue.c

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/* GTK - The GIMP Toolkit
* Copyright © 2016 Benjamin Otte <otte@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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkcsscalcvalueprivate.h"
#include <string.h>
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
gsize n_terms;
GtkCssValue * terms[1];
};
static gsize
gtk_css_value_calc_get_size (gsize n_terms)
{
g_assert (n_terms > 0);
return sizeof (GtkCssValue) + sizeof (GtkCssValue *) * (n_terms - 1);
}
static void
gtk_css_value_calc_free (GtkCssValue *value)
{
gsize i;
for (i = 0; i < value->n_terms; i++)
{
_gtk_css_value_unref (value->terms[i]);
}
g_slice_free1 (gtk_css_value_calc_get_size (value->n_terms), value);
}
static GtkCssValue *gtk_css_calc_value_new (gsize n_terms);
static GtkCssValue *
gtk_css_value_new_from_array (GPtrArray *array)
{
GtkCssValue *result;
if (array->len > 1)
{
result = gtk_css_calc_value_new (array->len);
memcpy (result->terms, array->pdata, array->len * sizeof (GtkCssValue *));
}
else
{
result = g_ptr_array_index (array, 0);
}
g_ptr_array_free (array, TRUE);
return result;
}
static void
gtk_css_calc_array_add (GPtrArray *array, GtkCssValue *value)
{
gsize i;
gint calc_term_order;
calc_term_order = gtk_css_number_value_get_calc_term_order (value);
for (i = 0; i < array->len; i++)
{
GtkCssValue *sum = gtk_css_number_value_try_add (g_ptr_array_index (array, i), value);
if (sum)
{
g_ptr_array_index (array, i) = sum;
_gtk_css_value_unref (value);
return;
}
else if (gtk_css_number_value_get_calc_term_order (g_ptr_array_index (array, i)) > calc_term_order)
{
g_ptr_array_insert (array, i, value);
return;
}
}
g_ptr_array_add (array, value);
}
static GtkCssValue *
gtk_css_value_calc_compute (GtkCssValue *value,
guint property_id,
GtkStyleProviderPrivate *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
GtkCssValue *result;
GPtrArray *array;
gboolean changed = FALSE;
gsize i;
array = g_ptr_array_new ();
for (i = 0; i < value->n_terms; i++)
{
GtkCssValue *computed = _gtk_css_value_compute (value->terms[i], property_id, provider, style, parent_style);
changed |= computed != value->terms[i];
gtk_css_calc_array_add (array, computed);
}
if (changed)
{
result = gtk_css_value_new_from_array (array);
}
else
{
g_ptr_array_set_free_func (array, (GDestroyNotify) _gtk_css_value_unref);
g_ptr_array_free (array, TRUE);
result = _gtk_css_value_ref (value);
}
return result;
}
static gboolean
gtk_css_value_calc_equal (const GtkCssValue *value1,
const GtkCssValue *value2)
{
gsize i;
if (value1->n_terms != value2->n_terms)
return FALSE;
for (i = 0; i < value1->n_terms; i++)
{
if (!_gtk_css_value_equal (value1->terms[i], value2->terms[i]))
return FALSE;
}
return TRUE;
}
static void
gtk_css_value_calc_print (const GtkCssValue *value,
GString *string)
{
gsize i;
g_string_append (string, "calc(");
_gtk_css_value_print (value->terms[0], string);
for (i = 1; i < value->n_terms; i++)
{
g_string_append (string, " + ");
_gtk_css_value_print (value->terms[i], string);
}
g_string_append (string, ")");
}
static double
gtk_css_value_calc_get (const GtkCssValue *value,
double one_hundred_percent)
{
double result = 0.0;
gsize i;
for (i = 0; i < value->n_terms; i++)
{
result += _gtk_css_number_value_get (value->terms[i], one_hundred_percent);
}
return result;
}
static GtkCssDimension
gtk_css_value_calc_get_dimension (const GtkCssValue *value)
{
GtkCssDimension dimension = GTK_CSS_DIMENSION_PERCENTAGE;
gsize i;
for (i = 0; i < value->n_terms && dimension == GTK_CSS_DIMENSION_PERCENTAGE; i++)
{
dimension = gtk_css_number_value_get_dimension (value->terms[i]);
}
return dimension;
}
static gboolean
gtk_css_value_calc_has_percent (const GtkCssValue *value)
{
gsize i;
for (i = 0; i < value->n_terms; i++)
{
if (gtk_css_number_value_has_percent (value->terms[i]))
return TRUE;
}
return FALSE;
}
static GtkCssValue *
gtk_css_value_calc_multiply (const GtkCssValue *value,
double factor)
{
GtkCssValue *result;
gsize i;
result = gtk_css_calc_value_new (value->n_terms);
for (i = 0; i < value->n_terms; i++)
{
result->terms[i] = gtk_css_number_value_multiply (value->terms[i], factor);
}
return result;
}
static GtkCssValue *
gtk_css_value_calc_try_add (const GtkCssValue *value1,
const GtkCssValue *value2)
{
return NULL;
}
static gint
gtk_css_value_calc_get_calc_term_order (const GtkCssValue *value)
{
/* This should never be needed because calc() can't contain calc(),
* but eh...
*/
return 0;
}
static const GtkCssNumberValueClass GTK_CSS_VALUE_CALC = {
{
gtk_css_value_calc_free,
gtk_css_value_calc_compute,
gtk_css_value_calc_equal,
gtk_css_number_value_transition,
gtk_css_value_calc_print
},
gtk_css_value_calc_get,
gtk_css_value_calc_get_dimension,
gtk_css_value_calc_has_percent,
gtk_css_value_calc_multiply,
gtk_css_value_calc_try_add,
gtk_css_value_calc_get_calc_term_order
};
static GtkCssValue *
gtk_css_calc_value_new (gsize n_terms)
{
GtkCssValue *result;
result = _gtk_css_value_alloc (&GTK_CSS_VALUE_CALC.value_class,
gtk_css_value_calc_get_size (n_terms));
result->n_terms = n_terms;
return result;
}
GtkCssValue *
gtk_css_calc_value_new_sum (GtkCssValue *value1,
GtkCssValue *value2)
{
GPtrArray *array;
gsize i;
array = g_ptr_array_new ();
if (value1->class == &GTK_CSS_VALUE_CALC.value_class)
{
for (i = 0; i < value1->n_terms; i++)
{
gtk_css_calc_array_add (array, _gtk_css_value_ref (value1->terms[i]));
}
}
else
{
gtk_css_calc_array_add (array, _gtk_css_value_ref (value1));
}
if (value2->class == &GTK_CSS_VALUE_CALC.value_class)
{
for (i = 0; i < value2->n_terms; i++)
{
gtk_css_calc_array_add (array, _gtk_css_value_ref (value2->terms[i]));
}
}
else
{
gtk_css_calc_array_add (array, _gtk_css_value_ref (value2));
}
return gtk_css_value_new_from_array (array);
}
GtkCssValue * gtk_css_calc_value_parse_sum (GtkCssParser *parser,
GtkCssNumberParseFlags flags);
GtkCssValue *
gtk_css_calc_value_parse_value (GtkCssParser *parser,
GtkCssNumberParseFlags flags)
{
if (_gtk_css_parser_has_prefix (parser, "calc"))
{
_gtk_css_parser_error (parser, "Nested calc() expressions are not allowed.");
return NULL;
}
if (_gtk_css_parser_try (parser, "(", TRUE))
{
GtkCssValue *result = gtk_css_calc_value_parse_sum (parser, flags);
if (result == NULL)
return NULL;
if (!_gtk_css_parser_try (parser, ")", TRUE))
{
_gtk_css_parser_error (parser, "Missing closing ')' in calc() subterm");
_gtk_css_value_unref (result);
return NULL;
}
return result;
}
return _gtk_css_number_value_parse (parser, flags);
}
static gboolean
is_number (GtkCssValue *value)
{
return gtk_css_number_value_get_dimension (value) == GTK_CSS_DIMENSION_NUMBER
&& !gtk_css_number_value_has_percent (value);
}
GtkCssValue *
gtk_css_calc_value_parse_product (GtkCssParser *parser,
GtkCssNumberParseFlags flags)
{
GtkCssValue *result, *value, *temp;
GtkCssNumberParseFlags actual_flags;
actual_flags = flags | GTK_CSS_PARSE_NUMBER;
result = gtk_css_calc_value_parse_value (parser, actual_flags);
if (result == NULL)
return NULL;
while (_gtk_css_parser_begins_with (parser, '*') || _gtk_css_parser_begins_with (parser, '/'))
{
if (actual_flags != GTK_CSS_PARSE_NUMBER && !is_number (result))
actual_flags = GTK_CSS_PARSE_NUMBER;
if (_gtk_css_parser_try (parser, "*", TRUE))
{
value = gtk_css_calc_value_parse_product (parser, actual_flags);
if (value == NULL)
goto fail;
if (is_number (value))
temp = gtk_css_number_value_multiply (result, _gtk_css_number_value_get (value, 100));
else
temp = gtk_css_number_value_multiply (value, _gtk_css_number_value_get (result, 100));
_gtk_css_value_unref (value);
_gtk_css_value_unref (result);
result = temp;
}
else if (_gtk_css_parser_try (parser, "/", TRUE))
{
value = gtk_css_calc_value_parse_product (parser, GTK_CSS_PARSE_NUMBER);
if (value == NULL)
goto fail;
temp = gtk_css_number_value_multiply (result, 1.0 / _gtk_css_number_value_get (value, 100));
_gtk_css_value_unref (value);
_gtk_css_value_unref (result);
result = temp;
}
else
{
g_assert_not_reached ();
goto fail;
}
}
if (is_number (result) && !(flags & GTK_CSS_PARSE_NUMBER))
{
_gtk_css_parser_error (parser, "calc() product term has no units");
goto fail;
}
return result;
fail:
_gtk_css_value_unref (result);
return NULL;
}
GtkCssValue *
gtk_css_calc_value_parse_sum (GtkCssParser *parser,
GtkCssNumberParseFlags flags)
{
GtkCssValue *result;
result = gtk_css_calc_value_parse_product (parser, flags);
if (result == NULL)
return NULL;
while (_gtk_css_parser_begins_with (parser, '+') || _gtk_css_parser_begins_with (parser, '-'))
{
GtkCssValue *next, *temp;
if (_gtk_css_parser_try (parser, "+", TRUE))
{
next = gtk_css_calc_value_parse_product (parser, flags);
if (next == NULL)
goto fail;
}
else if (_gtk_css_parser_try (parser, "-", TRUE))
{
temp = gtk_css_calc_value_parse_product (parser, flags);
if (temp == NULL)
goto fail;
next = gtk_css_number_value_multiply (temp, -1);
_gtk_css_value_unref (temp);
}
else
{
g_assert_not_reached ();
goto fail;
}
temp = gtk_css_number_value_add (result, next);
_gtk_css_value_unref (result);
_gtk_css_value_unref (next);
result = temp;
}
return result;
fail:
_gtk_css_value_unref (result);
return NULL;
}
GtkCssValue *
gtk_css_calc_value_parse (GtkCssParser *parser,
GtkCssNumberParseFlags flags)
{
GtkCssValue *value;
/* This confuses '*' and '/' so we disallow backwards compat. */
flags &= ~GTK_CSS_NUMBER_AS_PIXELS;
/* This can only be handled at compute time, we allow '-' after all */
flags &= ~GTK_CSS_POSITIVE_ONLY;
if (!_gtk_css_parser_try (parser, "calc(", TRUE))
{
_gtk_css_parser_error (parser, "Expected 'calc('");
return NULL;
}
value = gtk_css_calc_value_parse_sum (parser, flags);
if (value == NULL)
return NULL;
if (!_gtk_css_parser_try (parser, ")", TRUE))
{
_gtk_css_value_unref (value);
_gtk_css_parser_error (parser, "Expected ')' after calc() statement");
return NULL;
}
return value;
}