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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>
GtkCssValue * gtk_css_calc_value_parse_sum (GtkCssParser *parser,
GtkCssNumberParseFlags flags);
static GtkCssValue *
gtk_css_calc_value_parse_value (GtkCssParser *parser,
GtkCssNumberParseFlags flags)
{
if (gtk_css_parser_has_token (parser, GTK_CSS_TOKEN_OPEN_PARENS))
{
GtkCssValue *result;
gtk_css_parser_start_block (parser);
result = gtk_css_calc_value_parse_sum (parser, flags);
if (result == NULL)
{
gtk_css_parser_end_block (parser);
return NULL;
}
if (!gtk_css_parser_has_token (parser, GTK_CSS_TOKEN_EOF))
{
GtkCssLocation start = *gtk_css_parser_get_start_location (parser);
gtk_css_parser_skip_until (parser, GTK_CSS_TOKEN_EOF);
gtk_css_parser_error (parser,
GTK_CSS_PARSER_ERROR_SYNTAX,
&start,
gtk_css_parser_get_start_location (parser),
"Expected closing ')' in calc() subterm");
gtk_css_value_unref (result);
gtk_css_parser_end_block (parser);
return NULL;
}
gtk_css_parser_end_block (parser);
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);
}
static GtkCssValue *
gtk_css_calc_value_parse_product (GtkCssParser *parser,
GtkCssNumberParseFlags flags)
{
GtkCssValue *result, *value, *temp;
GtkCssNumberParseFlags actual_flags;
GtkCssLocation start;
actual_flags = flags | GTK_CSS_PARSE_NUMBER;
gtk_css_parser_get_token (parser);
start = *gtk_css_parser_get_start_location (parser);
result = gtk_css_calc_value_parse_value (parser, actual_flags);
if (result == NULL)
return NULL;
while (TRUE)
{
if (actual_flags != GTK_CSS_PARSE_NUMBER && !is_number (result))
actual_flags = GTK_CSS_PARSE_NUMBER;
if (gtk_css_parser_try_delim (parser, '*'))
{
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_delim (parser, '/'))
{
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
{
break;
}
}
if (is_number (result) && !(flags & GTK_CSS_PARSE_NUMBER))
{
gtk_css_parser_error (parser,
GTK_CSS_PARSER_ERROR_SYNTAX,
&start,
gtk_css_parser_get_start_location (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 (TRUE)
{
GtkCssValue *next, *temp;
if (gtk_css_parser_try_delim (parser, '+'))
{
next = gtk_css_calc_value_parse_product (parser, flags);
if (next == NULL)
goto fail;
}
else if (gtk_css_parser_try_delim (parser, '-'))
{
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
{
if (gtk_css_parser_has_token (parser, GTK_CSS_TOKEN_SIGNED_INTEGER) ||
gtk_css_parser_has_token (parser, GTK_CSS_TOKEN_SIGNED_NUMBER) ||
gtk_css_parser_has_token (parser, GTK_CSS_TOKEN_SIGNED_INTEGER_DIMENSION) ||
gtk_css_parser_has_token (parser, GTK_CSS_TOKEN_SIGNED_DIMENSION))
{
gtk_css_parser_error_syntax (parser, "Unexpected signed number, did you forget a space between sign and number?");
gtk_css_parser_consume_token (parser);
}
break;
}
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;
}
typedef struct
{
GtkCssNumberParseFlags flags;
GtkCssValue *value;
} ParseCalcData;
static guint
gtk_css_calc_value_parse_arg (GtkCssParser *parser,
guint arg,
gpointer data_)
{
ParseCalcData *data = data_;
data->value = gtk_css_calc_value_parse_sum (parser, data->flags);
if (data->value == NULL)
return 0;
return 1;
}
GtkCssValue *
gtk_css_calc_value_parse (GtkCssParser *parser,
GtkCssNumberParseFlags flags)
{
ParseCalcData data;
/* This can only be handled at compute time, we allow '-' after all */
data.flags = flags & ~GTK_CSS_POSITIVE_ONLY;
data.value = NULL;
if (!gtk_css_parser_has_function (parser, "calc"))
{
gtk_css_parser_error_syntax (parser, "Expected 'calc('");
return NULL;
}
if (!gtk_css_parser_consume_function (parser, 1, 1, gtk_css_calc_value_parse_arg, &data))
return NULL;
return data.value;
}
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