71 lines
1.8 KiB
PHP
71 lines
1.8 KiB
PHP
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<?php
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namespace dokuwiki\Subscriptions;
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use Exception;
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class SubscriberRegexBuilder
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{
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/**
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* Construct a regular expression for parsing a subscription definition line
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*
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* @param string|array $user
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* @param string|array $style
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* @param string|array $data
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*
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* @return string complete regexp including delimiters
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* @throws Exception when no data is passed
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* @author Andreas Gohr <andi@splitbrain.org>
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*
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*/
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public function buildRegex($user = null, $style = null, $data = null)
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{
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// always work with arrays
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$user = (array)$user;
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$style = (array)$style;
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$data = (array)$data;
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// clean
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$user = array_filter(array_map('trim', $user));
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$style = array_filter(array_map('trim', $style));
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$data = array_filter(array_map('trim', $data));
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// user names are encoded
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$user = array_map('auth_nameencode', $user);
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// quote
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$user = array_map('preg_quote_cb', $user);
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$style = array_map('preg_quote_cb', $style);
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$data = array_map('preg_quote_cb', $data);
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// join
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$user = join('|', $user);
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$style = join('|', $style);
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$data = join('|', $data);
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// any data at all?
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if ($user . $style . $data === '') {
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throw new Exception('no data passed');
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}
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// replace empty values, set which ones are optional
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$sopt = '';
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$dopt = '';
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if ($user === '') {
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$user = '\S+';
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}
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if ($style === '') {
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$style = '\S+';
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$sopt = '?';
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}
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if ($data === '') {
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$data = '\S+';
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$dopt = '?';
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}
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// assemble
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return "/^($user)(?:\\s+($style))$sopt(?:\\s+($data))$dopt$/";
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}
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}
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