178 lines
4 KiB
PHP
178 lines
4 KiB
PHP
<?php
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require_once 'simplepie.inc';
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function normalize_character_set($charset)
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{
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return strtolower(preg_replace('/(?:[^a-zA-Z0-9]+|([^0-9])0+)/', '\1', $charset));
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}
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function build_character_set_list()
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{
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$file = new SimplePie_File('http://www.iana.org/assignments/character-sets');
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if (!$file->success && !($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($file->status_code === 200 || $file->status_code > 206 && $file->status_code < 300)))
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{
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return false;
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}
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else
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{
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$data = explode("\n", $file->body);
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unset($file);
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foreach ($data as $line)
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{
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// New character set
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if (substr($line, 0, 5) === 'Name:')
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{
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// If we already have one, push it on to the array
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if (isset($aliases))
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{
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for ($i = 0, $count = count($aliases); $i < $count; $i++)
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{
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$aliases[$i] = normalize_character_set($aliases[$i]);
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}
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$charsets[$preferred] = array_unique($aliases);
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natsort($charsets[$preferred]);
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}
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$start = 5 + strspn($line, "\x09\x0A\x0B\xC\x0D\x20", 5);
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$chars = strcspn($line, "\x09\x0A\x0B\xC\x0D\x20", $start);
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$aliases = array(substr($line, $start, $chars));
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$preferred = end($aliases);
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}
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// Another alias
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elseif(substr($line, 0, 6) === 'Alias:')
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{
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$start = 7 + strspn($line, "\x09\x0A\x0B\xC\x0D\x20", 7);
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$chars = strcspn($line, "\x09\x0A\x0B\xC\x0D\x20", $start);
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$aliases[] = substr($line, $start, $chars);
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if (end($aliases) === 'None')
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{
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array_pop($aliases);
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}
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elseif (substr($line, 7 + $chars + 1, 21) === '(preferred MIME name)')
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{
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$preferred = end($aliases);
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}
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}
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}
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// Compatibility replacements
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$compat = array(
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'EUC-KR' => 'windows-949',
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'GB2312' => 'GBK',
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'GB_2312-80' => 'GBK',
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'ISO-8859-1' => 'windows-1252',
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'ISO-8859-9' => 'windows-1254',
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'ISO-8859-11' => 'windows-874',
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'KS_C_5601-1987' => 'windows-949',
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'TIS-620' => 'windows-874',
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//'US-ASCII' => 'windows-1252',
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'x-x-big5' => 'Big5',
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);
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foreach ($compat as $real => $replace)
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{
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if (isset($charsets[$real]) && isset($charsets[$replace]))
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{
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$charsets[$replace] = array_merge($charsets[$replace], $charsets[$real]);
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unset($charsets[$real]);
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}
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elseif (isset($charsets[$real]))
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{
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$charsets[$replace] = $charsets[$real];
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$charsets[$replace][] = normalize_character_set($replace);
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unset($charsets[$real]);
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}
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else
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{
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$charsets[$replace][] = normalize_character_set($real);
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}
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$charsets[$replace] = array_unique($charsets[$replace]);
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natsort($charsets[$replace]);
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}
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// Sort it
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uksort($charsets, 'strnatcasecmp');
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// Check that nothing matches more than one
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$all = call_user_func_array('array_merge', $charsets);
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$all_count = array_count_values($all);
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if (max($all_count) > 1)
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{
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echo "Duplicated charsets:\n";
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foreach ($all_count as $charset => $count)
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{
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if ($count > 1)
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{
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echo "$charset\n";
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}
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}
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}
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// And we're done!
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return $charsets;
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}
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}
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function charset($charset)
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{
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$normalized_charset = normalize_character_set($charset);
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if ($charsets = build_character_set_list())
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{
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foreach ($charsets as $preferred => $aliases)
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{
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if (in_array($normalized_charset, $aliases))
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{
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return $preferred;
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}
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}
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return $charset;
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}
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else
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{
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return false;
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}
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}
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function build_function()
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{
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if ($charsets = build_character_set_list())
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{
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$return = <<<EOF
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function charset(\$charset)
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{
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// Normalization from UTS #22
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switch (strtolower(preg_replace('/(?:[^a-zA-Z0-9]+|([^0-9])0+)/', '\\1', \$charset)))
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{
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EOF;
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foreach ($charsets as $preferred => $aliases)
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{
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foreach ($aliases as $alias)
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{
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$return .= "\t\tcase " . var_export($alias, true) . ":\n";
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}
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$return .= "\t\t\treturn " . var_export($preferred, true) . ";\n\n";
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}
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$return .= <<<EOF
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default:
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return \$charset;
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}
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}
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EOF;
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return $return;
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}
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else
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{
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return false;
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}
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}
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if (php_sapi_name() === 'cli' && realpath($_SERVER['argv'][0]) === __FILE__)
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{
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echo build_function();
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}
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?>
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