488 lines
12 KiB
C
488 lines
12 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright © 2016 Benjamin Otte <otte@gnome.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* 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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*/
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#include "config.h"
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#include "gtkcsscalcvalueprivate.h"
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#include <string.h>
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struct _GtkCssValue {
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GTK_CSS_VALUE_BASE
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gsize n_terms;
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GtkCssValue * terms[1];
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};
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static gsize
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gtk_css_value_calc_get_size (gsize n_terms)
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{
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g_assert (n_terms > 0);
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return sizeof (GtkCssValue) + sizeof (GtkCssValue *) * (n_terms - 1);
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}
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static void
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gtk_css_value_calc_free (GtkCssValue *value)
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{
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gsize i;
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for (i = 0; i < value->n_terms; i++)
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{
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_gtk_css_value_unref (value->terms[i]);
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}
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g_slice_free1 (gtk_css_value_calc_get_size (value->n_terms), value);
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}
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static GtkCssValue *gtk_css_calc_value_new (gsize n_terms);
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static GtkCssValue *
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gtk_css_value_new_from_array (GPtrArray *array)
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{
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GtkCssValue *result;
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if (array->len > 1)
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{
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result = gtk_css_calc_value_new (array->len);
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memcpy (result->terms, array->pdata, array->len * sizeof (GtkCssValue *));
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}
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else
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{
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result = g_ptr_array_index (array, 0);
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}
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g_ptr_array_free (array, TRUE);
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return result;
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}
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static void
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gtk_css_calc_array_add (GPtrArray *array, GtkCssValue *value)
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{
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gsize i;
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gint calc_term_order;
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calc_term_order = gtk_css_number_value_get_calc_term_order (value);
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for (i = 0; i < array->len; i++)
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{
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GtkCssValue *sum = gtk_css_number_value_try_add (g_ptr_array_index (array, i), value);
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if (sum)
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{
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g_ptr_array_index (array, i) = sum;
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_gtk_css_value_unref (value);
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return;
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}
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else if (gtk_css_number_value_get_calc_term_order (g_ptr_array_index (array, i)) > calc_term_order)
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{
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g_ptr_array_insert (array, i, value);
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return;
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}
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}
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g_ptr_array_add (array, value);
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}
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static GtkCssValue *
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gtk_css_value_calc_compute (GtkCssValue *value,
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guint property_id,
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GtkStyleProviderPrivate *provider,
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GtkCssStyle *style,
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GtkCssStyle *parent_style)
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{
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GtkCssValue *result;
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GPtrArray *array;
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gboolean changed = FALSE;
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gsize i;
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array = g_ptr_array_new ();
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for (i = 0; i < value->n_terms; i++)
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{
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GtkCssValue *computed = _gtk_css_value_compute (value->terms[i], property_id, provider, style, parent_style);
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changed |= computed != value->terms[i];
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gtk_css_calc_array_add (array, computed);
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}
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if (changed)
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{
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result = gtk_css_value_new_from_array (array);
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}
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else
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{
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g_ptr_array_set_free_func (array, (GDestroyNotify) _gtk_css_value_unref);
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g_ptr_array_free (array, TRUE);
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result = _gtk_css_value_ref (value);
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}
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return result;
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}
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static gboolean
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gtk_css_value_calc_equal (const GtkCssValue *value1,
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const GtkCssValue *value2)
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{
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gsize i;
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if (value1->n_terms != value2->n_terms)
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return FALSE;
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for (i = 0; i < value1->n_terms; i++)
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{
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if (!_gtk_css_value_equal (value1->terms[i], value2->terms[i]))
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return FALSE;
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}
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return TRUE;
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}
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static void
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gtk_css_value_calc_print (const GtkCssValue *value,
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GString *string)
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{
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gsize i;
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g_string_append (string, "calc(");
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_gtk_css_value_print (value->terms[0], string);
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for (i = 1; i < value->n_terms; i++)
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{
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g_string_append (string, " + ");
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_gtk_css_value_print (value->terms[i], string);
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}
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g_string_append (string, ")");
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}
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static double
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gtk_css_value_calc_get (const GtkCssValue *value,
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double one_hundred_percent)
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{
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double result = 0.0;
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gsize i;
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for (i = 0; i < value->n_terms; i++)
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{
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result += _gtk_css_number_value_get (value->terms[i], one_hundred_percent);
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}
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return result;
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}
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static GtkCssDimension
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gtk_css_value_calc_get_dimension (const GtkCssValue *value)
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{
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GtkCssDimension dimension = GTK_CSS_DIMENSION_PERCENTAGE;
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gsize i;
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for (i = 0; i < value->n_terms && dimension == GTK_CSS_DIMENSION_PERCENTAGE; i++)
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{
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dimension = gtk_css_number_value_get_dimension (value->terms[i]);
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}
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return dimension;
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}
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static gboolean
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gtk_css_value_calc_has_percent (const GtkCssValue *value)
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{
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gsize i;
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for (i = 0; i < value->n_terms; i++)
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{
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if (gtk_css_number_value_has_percent (value->terms[i]))
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return TRUE;
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}
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return FALSE;
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}
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static GtkCssValue *
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gtk_css_value_calc_multiply (const GtkCssValue *value,
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double factor)
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{
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GtkCssValue *result;
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gsize i;
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result = gtk_css_calc_value_new (value->n_terms);
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for (i = 0; i < value->n_terms; i++)
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{
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result->terms[i] = gtk_css_number_value_multiply (value->terms[i], factor);
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}
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return result;
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}
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static GtkCssValue *
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gtk_css_value_calc_try_add (const GtkCssValue *value1,
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const GtkCssValue *value2)
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{
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return NULL;
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}
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static gint
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gtk_css_value_calc_get_calc_term_order (const GtkCssValue *value)
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{
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/* This should never be needed because calc() can't contain calc(),
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* but eh...
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*/
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return 0;
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}
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static const GtkCssNumberValueClass GTK_CSS_VALUE_CALC = {
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{
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gtk_css_value_calc_free,
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gtk_css_value_calc_compute,
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gtk_css_value_calc_equal,
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gtk_css_number_value_transition,
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gtk_css_value_calc_print
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},
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gtk_css_value_calc_get,
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gtk_css_value_calc_get_dimension,
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gtk_css_value_calc_has_percent,
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gtk_css_value_calc_multiply,
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gtk_css_value_calc_try_add,
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gtk_css_value_calc_get_calc_term_order
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};
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static GtkCssValue *
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gtk_css_calc_value_new (gsize n_terms)
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{
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GtkCssValue *result;
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result = _gtk_css_value_alloc (>K_CSS_VALUE_CALC.value_class,
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gtk_css_value_calc_get_size (n_terms));
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result->n_terms = n_terms;
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return result;
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}
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GtkCssValue *
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gtk_css_calc_value_new_sum (GtkCssValue *value1,
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GtkCssValue *value2)
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{
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GPtrArray *array;
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gsize i;
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array = g_ptr_array_new ();
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if (value1->class == >K_CSS_VALUE_CALC.value_class)
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{
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for (i = 0; i < value1->n_terms; i++)
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{
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gtk_css_calc_array_add (array, _gtk_css_value_ref (value1->terms[i]));
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}
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}
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else
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{
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gtk_css_calc_array_add (array, _gtk_css_value_ref (value1));
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}
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if (value2->class == >K_CSS_VALUE_CALC.value_class)
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{
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for (i = 0; i < value2->n_terms; i++)
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{
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gtk_css_calc_array_add (array, _gtk_css_value_ref (value2->terms[i]));
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}
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}
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else
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{
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gtk_css_calc_array_add (array, _gtk_css_value_ref (value2));
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}
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return gtk_css_value_new_from_array (array);
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}
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GtkCssValue * gtk_css_calc_value_parse_sum (GtkCssParser *parser,
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GtkCssNumberParseFlags flags);
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GtkCssValue *
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gtk_css_calc_value_parse_value (GtkCssParser *parser,
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GtkCssNumberParseFlags flags)
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{
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if (_gtk_css_parser_has_prefix (parser, "calc"))
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{
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_gtk_css_parser_error (parser, "Nested calc() expressions are not allowed.");
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return NULL;
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}
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if (_gtk_css_parser_try (parser, "(", TRUE))
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{
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GtkCssValue *result = gtk_css_calc_value_parse_sum (parser, flags);
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if (result == NULL)
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return NULL;
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if (!_gtk_css_parser_try (parser, ")", TRUE))
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{
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_gtk_css_parser_error (parser, "Missing closing ')' in calc() subterm");
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_gtk_css_value_unref (result);
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return NULL;
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}
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return result;
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}
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return _gtk_css_number_value_parse (parser, flags);
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}
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static gboolean
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is_number (GtkCssValue *value)
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{
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return gtk_css_number_value_get_dimension (value) == GTK_CSS_DIMENSION_NUMBER
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&& !gtk_css_number_value_has_percent (value);
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}
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GtkCssValue *
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gtk_css_calc_value_parse_product (GtkCssParser *parser,
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GtkCssNumberParseFlags flags)
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{
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GtkCssValue *result, *value, *temp;
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GtkCssNumberParseFlags actual_flags;
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actual_flags = flags | GTK_CSS_PARSE_NUMBER;
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result = gtk_css_calc_value_parse_value (parser, actual_flags);
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if (result == NULL)
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return NULL;
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while (_gtk_css_parser_begins_with (parser, '*') || _gtk_css_parser_begins_with (parser, '/'))
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{
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if (actual_flags != GTK_CSS_PARSE_NUMBER && !is_number (result))
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actual_flags = GTK_CSS_PARSE_NUMBER;
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if (_gtk_css_parser_try (parser, "*", TRUE))
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{
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value = gtk_css_calc_value_parse_product (parser, actual_flags);
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if (value == NULL)
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goto fail;
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if (is_number (value))
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temp = gtk_css_number_value_multiply (result, _gtk_css_number_value_get (value, 100));
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else
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temp = gtk_css_number_value_multiply (value, _gtk_css_number_value_get (result, 100));
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_gtk_css_value_unref (value);
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_gtk_css_value_unref (result);
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result = temp;
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}
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else if (_gtk_css_parser_try (parser, "/", TRUE))
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{
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value = gtk_css_calc_value_parse_product (parser, GTK_CSS_PARSE_NUMBER);
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if (value == NULL)
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goto fail;
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temp = gtk_css_number_value_multiply (result, 1.0 / _gtk_css_number_value_get (value, 100));
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_gtk_css_value_unref (value);
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_gtk_css_value_unref (result);
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result = temp;
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}
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else
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{
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g_assert_not_reached ();
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goto fail;
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}
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}
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if (is_number (result) && !(flags & GTK_CSS_PARSE_NUMBER))
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{
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_gtk_css_parser_error (parser, "calc() product term has no units");
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goto fail;
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}
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return result;
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fail:
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_gtk_css_value_unref (result);
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return NULL;
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}
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GtkCssValue *
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gtk_css_calc_value_parse_sum (GtkCssParser *parser,
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GtkCssNumberParseFlags flags)
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{
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GtkCssValue *result;
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result = gtk_css_calc_value_parse_product (parser, flags);
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if (result == NULL)
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return NULL;
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while (_gtk_css_parser_begins_with (parser, '+') || _gtk_css_parser_begins_with (parser, '-'))
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{
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GtkCssValue *next, *temp;
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if (_gtk_css_parser_try (parser, "+", TRUE))
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{
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next = gtk_css_calc_value_parse_product (parser, flags);
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if (next == NULL)
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goto fail;
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}
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else if (_gtk_css_parser_try (parser, "-", TRUE))
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{
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temp = gtk_css_calc_value_parse_product (parser, flags);
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if (temp == NULL)
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goto fail;
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next = gtk_css_number_value_multiply (temp, -1);
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_gtk_css_value_unref (temp);
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}
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else
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{
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g_assert_not_reached ();
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goto fail;
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}
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temp = gtk_css_number_value_add (result, next);
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_gtk_css_value_unref (result);
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_gtk_css_value_unref (next);
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result = temp;
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}
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return result;
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fail:
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_gtk_css_value_unref (result);
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return NULL;
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}
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GtkCssValue *
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gtk_css_calc_value_parse (GtkCssParser *parser,
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GtkCssNumberParseFlags flags)
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{
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GtkCssValue *value;
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/* This confuses '*' and '/' so we disallow backwards compat. */
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flags &= ~GTK_CSS_NUMBER_AS_PIXELS;
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/* This can only be handled at compute time, we allow '-' after all */
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flags &= ~GTK_CSS_POSITIVE_ONLY;
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if (!_gtk_css_parser_try (parser, "calc(", TRUE))
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{
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_gtk_css_parser_error (parser, "Expected 'calc('");
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return NULL;
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}
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value = gtk_css_calc_value_parse_sum (parser, flags);
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if (value == NULL)
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return NULL;
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if (!_gtk_css_parser_try (parser, ")", TRUE))
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{
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_gtk_css_value_unref (value);
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_gtk_css_parser_error (parser, "Expected ')' after calc() statement");
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return NULL;
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}
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return value;
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}
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