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rcube_sieve_script.php
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rcube_sieve_script.php
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<?php
/**
* Class for operations on Sieve scripts
*
* Copyright (C) 2008-2011, The Roundcube Dev Team
* Copyright (C) 2011, Kolab Systems AG
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
class rcube_sieve_script
{
public $content = array(); // script rules array
private $vars = array(); // "global" variables
private $prefix = ''; // script header (comments)
private $supported = array( // supported Sieve extensions:
'body', // RFC5173
'copy', // RFC3894
'date', // RFC5260
'duplicate', // RFC7352
'enotify', // RFC5435
'envelope', // RFC5228
'ereject', // RFC5429
'fileinto', // RFC5228
'imapflags', // draft-melnikov-sieve-imapflags-06
'imap4flags', // RFC5232
'include', // RFC6609
'index', // RFC5260
'mime', // RFC5703 (except: foreverypart/break, enclose, extracttext)
'notify', // RFC5435
'regex', // draft-ietf-sieve-regex-01
'reject', // RFC5429
'relational', // RFC3431
'subaddress', // RFC5233
'vacation', // RFC5230
'vacation-seconds', // RFC6131
'variables', // RFC5229
// @TODO: spamtest+virustest, mailbox
);
/**
* Object constructor
*
* @param string Script's text content
* @param array List of capabilities supported by server
*/
public function __construct($script, $capabilities=array())
{
$capabilities = array_map('strtolower', (array) $capabilities);
// disable features by server capabilities
if (!empty($capabilities)) {
foreach ($this->supported as $idx => $ext) {
if (!in_array($ext, $capabilities)) {
unset($this->supported[$idx]);
}
}
}
// Parse text content of the script
$this->_parse_text($script);
}
/**
* Adds rule to the script (at the end)
*
* @param string Rule name
* @param array Rule content (as array)
*
* @return int The index of the new rule
*/
public function add_rule($content)
{
// TODO: check this->supported
array_push($this->content, $content);
return count($this->content) - 1;
}
public function delete_rule($index)
{
if (isset($this->content[$index])) {
unset($this->content[$index]);
return true;
}
return false;
}
public function size()
{
return count($this->content);
}
public function update_rule($index, $content)
{
// TODO: check this->supported
if ($this->content[$index]) {
$this->content[$index] = $content;
return $index;
}
return false;
}
/**
* Sets "global" variable
*
* @param string $name Variable name
* @param string $value Variable value
* @param array $mods Variable modifiers
*/
public function set_var($name, $value, $mods = array())
{
// Check if variable exists
for ($i=0, $len=count($this->vars); $i<$len; $i++) {
if ($this->vars[$i]['name'] == $name) {
break;
}
}
$var = array_merge($mods, array('name' => $name, 'value' => $value));
$this->vars[$i] = $var;
}
/**
* Unsets "global" variable
*
* @param string $name Variable name
*/
public function unset_var($name)
{
// Check if variable exists
foreach ($this->vars as $idx => $var) {
if ($var['name'] == $name) {
unset($this->vars[$idx]);
break;
}
}
}
/**
* Gets the value of "global" variable
*
* @param string $name Variable name
*
* @return string Variable value
*/
public function get_var($name)
{
// Check if variable exists
for ($i=0, $len=count($this->vars); $i<$len; $i++) {
if ($this->vars[$i]['name'] == $name) {
return $this->vars[$i]['name'];
}
}
}
/**
* Sets script header content
*
* @param string $text Header content
*/
public function set_prefix($text)
{
$this->prefix = $text;
}
/**
* Returns script as text
*/
public function as_text()
{
$output = '';
$exts = array();
$idx = 0;
if (!empty($this->vars)) {
if (in_array('variables', (array)$this->supported)) {
$has_vars = true;
array_push($exts, 'variables');
}
foreach ($this->vars as $var) {
if (empty($has_vars)) {
// 'variables' extension not supported, put vars in comments
$output .= sprintf("# %s %s\n", $var['name'], $var['value']);
}
else {
$output .= 'set ';
foreach (array_diff(array_keys($var), array('name', 'value')) as $opt) {
$output .= ":$opt ";
}
$output .= self::escape_string($var['name']) . ' ' . self::escape_string($var['value']) . ";\n";
}
}
}
$imapflags = in_array('imap4flags', $this->supported) ? 'imap4flags' : 'imapflags';
$notify = in_array('enotify', $this->supported) ? 'enotify' : 'notify';
// rules
foreach ($this->content as $rule) {
$script = '';
$tests = array();
$i = 0;
// header
if (!empty($rule['name']) && strlen($rule['name'])) {
$script .= '# rule:[' . $rule['name'] . "]\n";
}
// constraints expressions
if (!empty($rule['tests'])) {
foreach ($rule['tests'] as $test) {
$tests[$i] = '';
switch ($test['test']) {
case 'size':
$tests[$i] .= ($test['not'] ? 'not ' : '');
$tests[$i] .= 'size :' . ($test['type']=='under' ? 'under ' : 'over ') . $test['arg'];
break;
case 'true':
$tests[$i] .= ($test['not'] ? 'false' : 'true');
break;
case 'exists':
$tests[$i] .= ($test['not'] ? 'not ' : '') . 'exists';
$this->add_mime($test, $tests[$i], $exts);
$tests[$i] .= ' ' . self::escape_string($test['arg']);
break;
case 'header':
case 'string':
if ($test['test'] == 'string') {
array_push($exts, 'variables');
}
$tests[$i] .= ($test['not'] ? 'not ' : '');
$tests[$i] .= $test['test'];
if ($test['test'] == 'header') {
$this->add_mime($test, $tests[$i], $exts);
}
$this->add_index($test, $tests[$i], $exts);
$this->add_operator($test, $tests[$i], $exts);
$tests[$i] .= ' ' . self::escape_string($test['arg1']);
$tests[$i] .= ' ' . self::escape_string($test['arg2']);
break;
case 'address':
case 'envelope':
if ($test['test'] == 'envelope') {
array_push($exts, 'envelope');
}
$tests[$i] .= ($test['not'] ? 'not ' : '');
$tests[$i] .= $test['test'];
if ($test['test'] == 'address') {
$this->add_mime($test, $tests[$i], $exts);
$this->add_index($test, $tests[$i], $exts);
}
// :all address-part is optional, skip it
if (!empty($test['part']) && $test['part'] != 'all') {
$tests[$i] .= ' :' . $test['part'];
if ($test['part'] == 'user' || $test['part'] == 'detail') {
array_push($exts, 'subaddress');
}
}
$this->add_operator($test, $tests[$i], $exts);
$tests[$i] .= ' ' . self::escape_string($test['arg1']);
$tests[$i] .= ' ' . self::escape_string($test['arg2']);
break;
case 'body':
array_push($exts, 'body');
$tests[$i] .= ($test['not'] ? 'not ' : '') . 'body';
if (!empty($test['part'])) {
$tests[$i] .= ' :' . $test['part'];
if (!empty($test['content']) && $test['part'] == 'content') {
$tests[$i] .= ' ' . self::escape_string($test['content']);
}
}
$this->add_operator($test, $tests[$i], $exts);
$tests[$i] .= ' ' . self::escape_string($test['arg']);
break;
case 'date':
case 'currentdate':
array_push($exts, 'date');
$tests[$i] .= ($test['not'] ? 'not ' : '') . $test['test'];
$this->add_index($test, $tests[$i], $exts);
if (!empty($test['originalzone']) && $test['test'] == 'date') {
$tests[$i] .= ' :originalzone';
}
else if (!empty($test['zone'])) {
$tests[$i] .= ' :zone ' . self::escape_string($test['zone']);
}
$this->add_operator($test, $tests[$i], $exts);
if ($test['test'] == 'date') {
$tests[$i] .= ' ' . self::escape_string($test['header']);
}
$tests[$i] .= ' ' . self::escape_string($test['part']);
$tests[$i] .= ' ' . self::escape_string($test['arg']);
break;
case 'duplicate':
array_push($exts, 'duplicate');
$tests[$i] .= ($test['not'] ? 'not ' : '') . $test['test'];
$tokens = array('handle', 'uniqueid', 'header');
foreach ($tokens as $token)
if ($test[$token] !== null && $test[$token] !== '') {
$tests[$i] .= " :$token " . self::escape_string($test[$token]);
}
if (!empty($test['seconds'])) {
$tests[$i] .= ' :seconds ' . intval($test['seconds']);
}
if (!empty($test['last'])) {
$tests[$i] .= ' :last';
}
break;
}
$i++;
}
}
// disabled rule: if false #....
if (!empty($tests)) {
$script .= 'if ' . ($rule['disabled'] ? 'false # ' : '');
if (count($tests) > 1) {
$tests_str = implode(', ', $tests);
}
else {
$tests_str = $tests[0];
}
if ($rule['join'] || count($tests) > 1) {
$script .= sprintf('%s (%s)', $rule['join'] ? 'allof' : 'anyof', $tests_str);
}
else {
$script .= $tests_str;
}
$script .= "\n{\n";
}
// action(s)
if (!empty($rule['actions'])) {
foreach ($rule['actions'] as $action) {
$action_script = '';
switch ($action['type']) {
case 'fileinto':
array_push($exts, 'fileinto');
$action_script .= 'fileinto ';
if ($action['copy']) {
$action_script .= ':copy ';
array_push($exts, 'copy');
}
$action_script .= self::escape_string($action['target']);
break;
case 'redirect':
$action_script .= 'redirect ';
if ($action['copy']) {
$action_script .= ':copy ';
array_push($exts, 'copy');
}
$action_script .= self::escape_string($action['target']);
break;
case 'reject':
case 'ereject':
array_push($exts, $action['type']);
$action_script .= $action['type'].' '
. self::escape_string($action['target']);
break;
case 'addflag':
case 'setflag':
case 'removeflag':
array_push($exts, $imapflags);
$action_script .= $action['type'].' '
. self::escape_string($action['target']);
break;
case 'keep':
case 'discard':
case 'stop':
$action_script .= $action['type'];
break;
case 'include':
array_push($exts, 'include');
$action_script .= 'include ';
foreach (array_diff(array_keys($action), array('target', 'type')) as $opt) {
$action_script .= ":$opt ";
}
$action_script .= self::escape_string($action['target']);
break;
case 'set':
array_push($exts, 'variables');
$action_script .= 'set ';
foreach (array_diff(array_keys($action), array('name', 'value', 'type')) as $opt) {
$action_script .= ":$opt ";
}
$action_script .= self::escape_string($action['name']) . ' ' . self::escape_string($action['value']);
break;
case 'replace':
array_push($exts, 'mime');
$action_script .= 'replace';
if (!empty($action['mime'])) {
$action_script .= " :mime";
}
if (!empty($action['subject'])) {
$action_script .= " :subject " . self::escape_string($action['subject']);
}
if (!empty($action['from'])) {
$action_script .= " :from " . self::escape_string($action['from']);
}
$action_script .= ' ' . self::escape_string($action['replace']);
break;
case 'notify':
array_push($exts, $notify);
$action_script .= 'notify';
$method = $action['method'];
unset($action['method']);
$action['options'] = (array) $action['options'];
// Here we support draft-martin-sieve-notify-01 used by Cyrus
if ($notify == 'notify') {
switch ($action['importance']) {
case 1: $action_script .= " :high"; break;
//case 2: $action_script .= " :normal"; break;
case 3: $action_script .= " :low"; break;
}
// Old-draft way: :method "mailto" :options "email@address"
if (!empty($method)) {
$parts = explode(':', $method, 2);
$action['method'] = $parts[0];
array_unshift($action['options'], $parts[1]);
}
unset($action['importance']);
unset($action['from']);
unset($method);
}
foreach (array('id', 'importance', 'method', 'options', 'from', 'message') as $n_tag) {
if (!empty($action[$n_tag])) {
$action_script .= " :$n_tag " . self::escape_string($action[$n_tag]);
}
}
if (!empty($method)) {
$action_script .= ' ' . self::escape_string($method);
}
break;
case 'vacation':
array_push($exts, 'vacation');
$action_script .= 'vacation';
if (isset($action['seconds'])) {
array_push($exts, 'vacation-seconds');
$action_script .= " :seconds " . intval($action['seconds']);
}
else if (!empty($action['days'])) {
$action_script .= " :days " . intval($action['days']);
}
if (!empty($action['addresses']))
$action_script .= " :addresses " . self::escape_string($action['addresses']);
if (!empty($action['subject']))
$action_script .= " :subject " . self::escape_string($action['subject']);
if (!empty($action['handle']))
$action_script .= " :handle " . self::escape_string($action['handle']);
if (!empty($action['from']))
$action_script .= " :from " . self::escape_string($action['from']);
if (!empty($action['mime']))
$action_script .= " :mime";
$action_script .= " " . self::escape_string($action['reason']);
break;
}
if ($action_script) {
$script .= !empty($tests) ? "\t" : '';
$script .= $action_script . ";\n";
}
}
}
if ($script) {
$output .= $script . (!empty($tests) ? "}\n" : '');
$idx++;
}
}
// requires
if (!empty($exts)) {
$exts = array_unique($exts);
if (in_array('vacation-seconds', $exts) && ($key = array_search('vacation', $exts)) !== false) {
unset($exts[$key]);
}
sort($exts); // for convenience use always the same order
$output = 'require ["' . implode('","', $exts) . "\"];\n" . $output;
}
if (!empty($this->prefix)) {
$output = $this->prefix . "\n\n" . $output;
}
return $output;
}
/**
* Returns script object
*
*/
public function as_array()
{
return $this->content;
}
/**
* Returns array of supported extensions
*
*/
public function get_extensions()
{
return array_values($this->supported);
}
/**
* Converts text script to rules array
*
* @param string Text script
*/
private function _parse_text($script)
{
$prefix = '';
$options = array();
$position = 0;
$length = strlen($script);
while ($position < $length) {
// skip whitespace chars
$position = self::ltrim_position($script, $position);
$rulename = '';
// Comments
while ($script[$position] === '#') {
$endl = strpos($script, "\n", $position) ?: $length;
$line = substr($script, $position, $endl - $position);
// Roundcube format
if (preg_match('/^# rule:\[(.*)\]/', $line, $matches)) {
$rulename = $matches[1];
}
// KEP:14 variables
else if (preg_match('/^# (EDITOR|EDITOR_VERSION) (.+)$/', $line, $matches)) {
$this->set_var($matches[1], $matches[2]);
}
// Horde-Ingo format
else if (!empty($options['format']) && $options['format'] == 'INGO'
&& preg_match('/^# (.*)/', $line, $matches)
) {
$rulename = $matches[1];
}
else if (empty($options['prefix'])) {
$prefix .= $line . "\n";
}
// skip empty lines after the comment (#5657)
$position = self::ltrim_position($script, $endl + 1);
}
// handle script header
if (empty($options['prefix'])) {
$options['prefix'] = true;
if ($prefix && strpos($prefix, 'horde.org/ingo')) {
$options['format'] = 'INGO';
}
}
// Control structures/blocks
if (preg_match('/^(if|else|elsif)/i', substr($script, $position, 5))) {
$rule = $this->_tokenize_rule($script, $position);
if (strlen($rulename) && !empty($rule)) {
$rule['name'] = $rulename;
}
}
// Simple commands
else {
$rule = $this->_parse_actions($script, $position, ';');
if (!empty($rule[0]) && is_array($rule)) {
// set "global" variables
if ($rule[0]['type'] == 'set') {
unset($rule[0]['type']);
$this->vars[] = $rule[0];
unset($rule);
}
else {
$rule = array('actions' => $rule);
}
}
}
if (!empty($rule)) {
$this->content[] = $rule;
}
}
if (!empty($prefix)) {
$this->prefix = trim($prefix);
}
}
/**
* Convert text script fragment to rule object
*
* @param string $content The whole script content
* @param int &$position Start position in the script
*
* @return array Rule data
*/
private function _tokenize_rule($content, &$position)
{
$cond = strtolower(self::tokenize($content, 1, $position));
if ($cond != 'if' && $cond != 'elsif' && $cond != 'else') {
return null;
}
$disabled = false;
$join = false;
$join_not = false;
$length = strlen($content);
// disabled rule (false + comment): if false # .....
if (preg_match('/^\s*false\s+#\s*/i', substr($content, $position, 20), $m)) {
$position += strlen($m[0]);
$disabled = true;
}
while ($position < $length) {
$tokens = self::tokenize($content, true, $position);
$separator = array_pop($tokens);
if (!empty($tokens)) {
$token = array_shift($tokens);
}
else {
$token = $separator;
}
$token = strtolower($token);
if ($token == 'not') {
$not = true;
$token = strtolower(array_shift($tokens));
}
else {
$not = false;
}
// we support "not allof" as a negation of allof sub-tests
if ($join_not) {
$not = !$not;
}
switch ($token) {
case 'allof':
$join = true;
$join_not = $not;
break;
case 'anyof':
break;
case 'size':
$test = array('test' => 'size', 'not' => $not);
$test['arg'] = array_pop($tokens);
for ($i=0, $len=count($tokens); $i<$len; $i++) {
if (!is_array($tokens[$i])
&& preg_match('/^:(under|over)$/i', $tokens[$i])
) {
$test['type'] = strtolower(substr($tokens[$i], 1));
}
}
$tests[] = $test;
break;
case 'header':
case 'string':
case 'address':
case 'envelope':
$test = array('test' => $token, 'not' => $not);
$test['arg2'] = array_pop($tokens);
$test['arg1'] = array_pop($tokens);
$test += $this->test_tokens($tokens);
if ($token != 'header' && $token != 'string' && !empty($tokens)) {
for ($i=0, $len=count($tokens); $i<$len; $i++) {
if (!is_array($tokens[$i]) && preg_match('/^:(localpart|domain|all|user|detail)$/i', $tokens[$i])) {
$test['part'] = strtolower(substr($tokens[$i], 1));
}
}
}
$tests[] = $test;
break;
case 'body':
$test = array('test' => 'body', 'not' => $not);
$test['arg'] = array_pop($tokens);
$test += $this->test_tokens($tokens);
for ($i=0, $len=count($tokens); $i<$len; $i++) {
if (!is_array($tokens[$i]) && preg_match('/^:(raw|content|text)$/i', $tokens[$i])) {
$test['part'] = strtolower(substr($tokens[$i], 1));
if ($test['part'] == 'content') {
$test['content'] = $tokens[++$i];
}
}
}
$tests[] = $test;
break;
case 'date':
case 'currentdate':
$test = array('test' => $token, 'not' => $not);
$test['arg'] = array_pop($tokens);
$test['part'] = array_pop($tokens);
if ($token == 'date') {
$test['header'] = array_pop($tokens);
}
$test += $this->test_tokens($tokens);
for ($i=0, $len=count($tokens); $i<$len; $i++) {
if (!is_array($tokens[$i]) && preg_match('/^:zone$/i', $tokens[$i])) {
$test['zone'] = $tokens[++$i];
}
else if (!is_array($tokens[$i]) && preg_match('/^:originalzone$/i', $tokens[$i])) {
$test['originalzone'] = true;
}
}
$tests[] = $test;
break;
case 'duplicate':
$test = array('test' => $token, 'not' => $not);
for ($i=0, $len=count($tokens); $i<$len; $i++) {
if (!is_array($tokens[$i])) {
if (preg_match('/^:(handle|header|uniqueid|seconds)$/i', $tokens[$i], $m)) {
$test[strtolower($m[1])] = $tokens[++$i];
}
else if (preg_match('/^:last$/i', $tokens[$i])) {
$test['last'] = true;
}
}
}
$tests[] = $test;
break;
case 'exists':
$test = array('test' => 'exists', 'not' => $not, 'arg' => array_pop($tokens));
$test += $this->test_tokens($tokens);
$tests[] = $test;
break;
case 'true':
$tests[] = array('test' => 'true', 'not' => $not);
break;
case 'false':
$tests[] = array('test' => 'true', 'not' => !$not);
break;
}
// goto actions...
if ($separator == '{') {
break;
}
}
// ...and actions block
$actions = $this->_parse_actions($content, $position);
if ($tests && $actions) {
$result = array(
'type' => $cond,
'tests' => $tests,
'actions' => $actions,
'join' => $join,
'disabled' => $disabled,
);
}
return $result;
}
/**
* Parse body of actions section
*
* @param string $content The whole script content
* @param int &$position Start position in the script
* @param string $end End of text separator
*
* @return array Array of parsed action type/target pairs
*/
private function _parse_actions($content, &$position, $end = '}')
{
$result = null;
$length = strlen($content);
while ($position < $length) {
$tokens = self::tokenize($content, true, $position);
$separator = array_pop($tokens);
$token = !empty($tokens) ? array_shift($tokens) : $separator;
switch ($token) {
case 'if':
// nested 'if' conditions, ignore the whole rule (#5540)
$this->_parse_actions($content, $position);
continue 2;
case 'discard':
case 'keep':
case 'stop':
$result[] = array('type' => $token);
break;
case 'fileinto':
case 'redirect':
$action = array('type' => $token, 'target' => array_pop($tokens));
$args = array('copy');
$action += $this->action_arguments($tokens, $args);
$result[] = $action;
break;
case 'vacation':
$action = array('type' => 'vacation', 'reason' => array_pop($tokens));
$args = array('mime');
$vargs = array('seconds', 'days', 'addresses', 'subject', 'handle', 'from');
$action += $this->action_arguments($tokens, $args, $vargs);
$result[] = $action;
break;
case 'reject':
case 'ereject':
case 'setflag':
case 'addflag':
case 'removeflag':
$result[] = array('type' => $token, 'target' => array_pop($tokens));
break;
case 'include':
$action = array('type' => 'include', 'target' => array_pop($tokens));
$args = array('once', 'optional', 'global', 'personal');
$action += $this->action_arguments($tokens, $args);
$result[] = $action;
break;
case 'set':
$action = array('type' => 'set', 'value' => array_pop($tokens), 'name' => array_pop($tokens));
$args = array('lower', 'upper', 'lowerfirst', 'upperfirst', 'quotewildcard', 'length');
$action += $this->action_arguments($tokens, $args);
$result[] = $action;
break;
case 'replace':
$action = array('type' => 'replace', 'replace' => array_pop($tokens));
$args = array('mime');
$vargs = array('subject', 'from');
$action += $this->action_arguments($tokens, $args, $vargs);
$result[] = $action;
break;
case 'require':
// skip, will be build according to used commands
// $result[] = array('type' => 'require', 'target' => array_pop($tokens));
break;
case 'notify':
$action = array('type' => 'notify');
$priorities = array('high' => 1, 'normal' => 2, 'low' => 3);
$vargs = array('from', 'id', 'importance', 'options', 'message', 'method');
$args = array_keys($priorities);
$action += $this->action_arguments($tokens, $args, $vargs);
// Here we'll convert draft-martin-sieve-notify-01 into RFC 5435
if (!isset($action['importance'])) {
foreach ($priorities as $key => $val) {
if (isset($action[$key])) {
$action['importance'] = $val;
unset($action[$key]);
}
}
}
$action['options'] = (array) $action['options'];
// Old-draft way: :method "mailto" :options "email@address"
if (!empty($action['method']) && !empty($action['options'])) {
$action['method'] .= ':' . array_shift($action['options']);
}
// unnamed parameter is a :method in enotify extension
else if (!isset($action['method'])) {
$action['method'] = array_pop($tokens);
}
$result[] = $action;
break;
}
if ($separator == $end) {
break;
}
}
return $result;
}
/**
* Add comparator to the test
*/
private function add_comparator($test, &$out, &$exts)
{
if (empty($test['comparator'])) {
return;
}
if ($test['comparator'] == 'i;ascii-numeric') {
array_push($exts, 'relational');
array_push($exts, 'comparator-i;ascii-numeric');
}
else if (!in_array($test['comparator'], array('i;octet', 'i;ascii-casemap'))) {
array_push($exts, 'comparator-' . $test['comparator']);
}
// skip default comparator
if ($test['comparator'] != 'i;ascii-casemap') {
$out .= ' :comparator ' . self::escape_string($test['comparator']);
}
}
/**
* Add index argument to the test
*/
private function add_index($test, &$out, &$exts)
{
if (!empty($test['index'])) {
array_push($exts, 'index');
$out .= ' :index ' . intval($test['index']) . ($test['last'] ? ' :last' : '');
}
}
/**
* Add mime argument(s) to the test
*/
private function add_mime($test, &$out, &$exts)
{
foreach (array('mime', 'mime-anychild', 'mime-type', 'mime-subtype', 'mime-contenttype', 'mime-param') as $opt) {
if (!empty($test[$opt])) {
$opt_name = str_replace('mime-', '', $opt);
if (!$got_mime) {
$out .= ' :mime';
$got_mime = true;
array_push($exts, 'mime');
}
if ($opt_name != 'mime') {
$out .= " :$opt_name";
}
if ($opt_name == 'param') {
$out .= ' ' . self::escape_string($test[$opt]);
}
}
}
}
/**
* Add operators to the test
*/
private function add_operator($test, &$out, &$exts)
{
if (empty($test['type'])) {
return;
}
// relational operator
if (preg_match('/^(value|count)-([gteqnl]{2})/', $test['type'], $m)) {
array_push($exts, 'relational');
$out .= ' :' . $m[1] . ' "' . $m[2] . '"';
}
else {
if ($test['type'] == 'regex') {
array_push($exts, 'regex');
}
$out .= ' :' . $test['type'];
}
$this->add_comparator($test, $out, $exts);
}
/**
* Extract test tokens
*/
private function test_tokens(&$tokens)
{
$test = array();
$result = array();
for ($i=0, $len=count($tokens); $i<$len; $i++) {
$token = is_array($tokens[$i]) ? null : $tokens[$i];
if ($token && preg_match('/^:comparator$/i', $token)) {
$test['comparator'] = $tokens[++$i];
}
else if ($token && preg_match('/^:(count|value)$/i', $token)) {
$test['type'] = strtolower(substr($token, 1)) . '-' . $tokens[++$i];
}
else if ($token && preg_match('/^:(is|contains|matches|regex)$/i', $token)) {
$test['type'] = strtolower(substr($token, 1));
}
else if ($token && preg_match('/^:(mime|anychild|type|subtype|contenttype|param)$/i', $token)) {
$token = strtolower(substr($token, 1));
$key = $token == 'mime' ? $token : "mime-$token";
$test[$key] = $token == 'param' ? $tokens[++$i] : true;
}
else if ($token && preg_match('/^:index$/i', $token)) {
$test['index'] = intval($tokens[++$i]);
if ($tokens[$i+1] && preg_match('/^:last$/i', $tokens[$i+1])) {
$test['last'] = true;
$i++;
}
}
else {
$result[] = $tokens[$i];
}
}
$tokens = $result;
return $test;
}
/**
* Extract action arguments
*/
private function action_arguments(&$tokens, $bool_args, $val_args = array())
{
$action = array();
$result = array();
for ($i=0, $len=count($tokens); $i<$len; $i++) {
$tok = $tokens[$i];
if (!is_array($tok) && $tok[0] == ':') {
$tok = strtolower(substr($tok, 1));
if (in_array($tok, $bool_args)) {
$action[$tok] = true;
}
else if (in_array($tok, $val_args)) {
$action[$tok] = $tokens[++$i];
}
else {
$result[] = $tok;
}
}
else {
$result[] = $tok;
}
}
$tokens = $result;
return $action;
}
/**
* Escape special chars into quoted string value or multi-line string
* or list of strings
*
* @param string $str Text or array (list) of strings
*
* @return string Result text
*/
static function escape_string($str)
{
if (is_array($str) && count($str) > 1) {
foreach ($str as $idx => $val) {
$str[$idx] = self::escape_string($val);
}
return '[' . implode(',', $str) . ']';
}
else if (is_array($str)) {
$str = array_pop($str);
}
// multi-line string
if (preg_match('/[\r\n\0]/', $str)) {
return sprintf("text:\n%s\n.\n", self::escape_multiline_string($str));
}
// quoted-string
else {
return '"' . addcslashes($str, '\\"') . '"';
}
}
/**
* Escape special chars in multi-line string value
*
* @param string $str Text
*
* @return string Text
*/
static function escape_multiline_string($str)
{
$str = preg_split('/(\r?\n)/', $str, -1, PREG_SPLIT_DELIM_CAPTURE);
foreach ($str as $idx => $line) {
// dot-stuffing
if (isset($line[0]) && $line[0] == '.') {
$str[$idx] = '.' . $line;
}
}
return implode($str);
}
/**
* Splits script into string tokens
*
* @param string $str The script
* @param mixed $num Number of tokens to return, 0 for all
* or True for all tokens until separator is found.
* Separator will be returned as last token.
* @param int &$position Parsing start position
*
* @return mixed Tokens array or string if $num=1
*/
static function tokenize($str, $num = 0, &$position = 0)
{
$result = array();
$length = strlen($str);
// remove spaces from the beginning of the string
while ($position < $length && (!$num || $num === true || count($result) < $num)) {
// skip whitespace chars
$position = self::ltrim_position($str, $position);
switch ($str[$position]) {
// Quoted string
case '"':
for ($pos = $position + 1; $pos < $length; $pos++) {
if ($str[$pos] == '"') {
break;
}
if ($str[$pos] == "\\") {
if ($str[$pos + 1] == '"' || $str[$pos + 1] == "\\") {
$pos++;
}
}
}
if ($str[$pos] != '"') {
// error
}
// we need to strip slashes for a quoted string
$result[] = stripslashes(substr($str, $position + 1, $pos - $position - 1));
$position = $pos + 1;
break;
// Parenthesized list
case '[':
$position++;
$result[] = self::tokenize($str, 0, $position);
break;
case ']':
$position++;
return $result;
break;
// list/test separator
case ',':
// command separator
case ';':
// block/tests-list
case '(':
case ')':
case '{':
case '}':
$sep = $str[$position];
$position++;
if ($num === true) {
$result[] = $sep;
break 2;
}
break;
// bracket-comment
case '/':
if ($str[$position + 1] == '*') {
if ($end_pos = strpos($str, '*/', $position + 2)) {
$position = $end_pos + 2;
}
else {
// error
$position = $length;
}
}
break;
// hash-comment
case '#':
if ($lf_pos = strpos($str, "\n", $position)) {
$position = $lf_pos + 1;
break;
}
else {
$position = $length;
}
// String atom
default:
// empty or one character
if ($position == $length) {
break 2;
}
if ($length - $position < 2) {
$result[] = substr($str, $position);
$position = $length;
break;
}
// tag/identifier/number
if (preg_match('/[a-zA-Z0-9:_]+/', $str, $m, PREG_OFFSET_CAPTURE, $position)
&& $m[0][1] == $position
) {
$atom = $m[0][0];
$position += strlen($atom);
if ($atom != 'text:') {
$result[] = $atom;
}
// multiline string
else {
// skip whitespace chars (except \r\n)
$position = self::ltrim_position($str, $position, false);
// possible hash-comment after "text:"
if ($str[$position] === '#') {
$endl = strpos($str, "\n", $position);
$position = $endl ?: $length;
}
// skip \n or \r\n
if ($str[$position] == "\n") {
$position++;
}
else if ($str[$position] == "\r" && $str[$position + 1] == "\n") {
$position += 2;
}
$text = '';
// get text until alone dot in a line
while ($position < $length) {
$pos = strpos($str, "\n.", $position);
if ($pos === false) {
break;
}
$text .= substr($str, $position, $pos - $position);
$position = $pos + 2;
if ($str[$position] == "\n") {
break;
}
if ($str[$position] == "\r" && $str[$position + 1] == "\n") {
$position++;
break;
}
$text .= "\n.";
}
// remove dot-stuffing
$text = str_replace("\n..", "\n.", $text);
$result[] = $text;
$position++;
}
}
// fallback, skip one character as infinite loop prevention
else {
$position++;
}
break;
}
}
return $num === 1 ? (isset($result[0]) ? $result[0] : null) : $result;
}
/**
* Skip whitespace characters in a string from specified position.
*/
static function ltrim_position($content, $position, $br = true)
{
$blanks = array("\t", "\0", "\x0B", " ");
if ($br) {
$blanks[] = "\r";
$blanks[] = "\n";
}
while (isset($content[$position]) && isset($content[$position + 1])
&& in_array($content[$position], $blanks, true)
) {
$position++;
}
return $position;
}
}

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