/**
* Standard modular run function for snippet hooks. Generates XHTML to insert into a page using AJAX.
*
* @return tempcode The snippet
*/
function run()
{
$theme = get_param('theme');
$equation = get_param('css_equation');
require_code('themewizard');
$css_path = get_custom_file_base() . '/themes/' . $theme . '/css_custom/global.css';
if (!file_exists($css_path)) {
$css_path = get_file_base() . '/themes/default/css/global.css';
}
$css_file_contents = file_get_contents($css_path, FILE_TEXT);
$seed = find_theme_seed($theme);
$dark = strpos($css_file_contents, '#000000; /* {$,wizard, 100% W/B} */') !== false;
$colours = calculate_theme($seed, $theme, 'equations', 'colours', $dark);
$parsed_equation = parse_css_colour_expression($equation);
if (is_null($parsed_equation)) {
return make_string_tempcode('');
}
$answer = execute_css_colour_expression($parsed_equation, $colours[0]);
if (is_null($answer)) {
return make_string_tempcode('');
}
return make_string_tempcode('#' . $answer);
}
/**
* Augment an array of CSS colours with colours that are derived actually inside the CSS-sheets.
*
* @param array Map of colours.
* @param ID_TEXT The theme it's being generated from
* @return array A pair: extended map of colours, colour expression landscape
*/
function calculate_dynamic_css_colours($colours, $source_theme)
{
$theme = filter_naughty($source_theme);
$css_dir = $theme == 'default' ? 'css' : 'css_custom';
$dh = opendir(get_file_base() . '/themes/' . $theme . '/' . $css_dir . '/');
require_lang('themes');
// First we build up our landscape
$landscape = array();
while (($sheet = readdir($dh)) !== false) {
if (substr($sheet, -4) == '.css') {
$path = get_file_base() . '/themes/' . $theme . '/' . $css_dir . '/' . $sheet;
$contents = unixify_line_format(file_get_contents($path, FILE_TEXT));
$matches = array();
$num_matches = preg_match_all('#/\\* *\\{\\$,([^,\\n\\r\\$\']*),([^}{\\n\\r\\$\']*)\\}#', $contents, $matches);
for ($i = 0; $i < $num_matches; $i++) {
$parsed = parse_css_colour_expression($matches[2][$i]);
if (!is_null($parsed)) {
// Colour name Parsed expression Full match string Final colour
$landscape[] = array($matches[1][$i], $parsed, substr($matches[0][$i], 6, strlen($matches[0][$i]) - 7), NULL);
}
}
}
}
// Then we resolve our expressions
$resolved_landscaped = array();
$safety_count = 0;
while (count($landscape) != 0) {
foreach ($landscape as $i => $peak) {
$peak[3] = execute_css_colour_expression($peak[1], $colours);
if (!is_null($peak[3])) {
$resolved_landscaped[] = $peak;
unset($landscape[$i]);
// Then we add to the colours array
if ($peak[0] != 'wizard') {
$colours[$peak[0]] = $peak[3];
}
}
}
$safety_count++;
if ($safety_count == 100) {
$_landscape = '';
foreach ($landscape as $x) {
if ($_landscape != '') {
$_landscape .= '; ';
}
$_landscape .= $x[2];
}
fatal_exit(do_lang_tempcode('UNRESOLVABLE_COLOURS', escape_html($_landscape)));
}
}
return array($colours, $resolved_landscaped);
}
