115 lines
2.9 KiB
PHP
115 lines
2.9 KiB
PHP
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<?php
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/*
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* This file is part of Psy Shell.
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*
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* (c) 2012-2018 Justin Hileman
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Psy\Util;
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/**
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* String utility methods.
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*
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* @author ju1ius
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*/
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class Str
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{
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const UNVIS_RX = <<<'EOS'
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/
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\\(?:
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((?:040)|s)
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| (240)
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| (?: M-(.) )
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| (?: M\^(.) )
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| (?: \^(.) )
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)
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/xS
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EOS;
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/**
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* Decodes a string encoded by libsd's strvis.
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*
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* From `man 3 vis`:
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*
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* Use an ‘M’ to represent meta characters (characters with the 8th bit set),
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* and use a caret ‘^’ to represent control characters (see iscntrl(3)).
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* The following formats are used:
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*
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* \040 Represents ASCII space.
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*
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* \240 Represents Meta-space (  in HTML).
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*
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* \M-C Represents character ‘C’ with the 8th bit set.
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* Spans characters ‘\241’ through ‘\376’.
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*
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* \M^C Represents control character ‘C’ with the 8th bit set.
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* Spans characters ‘\200’ through ‘\237’, and ‘\377’ (as ‘\M^?’).
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*
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* \^C Represents the control character ‘C’.
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* Spans characters ‘\000’ through ‘\037’, and ‘\177’ (as ‘\^?’).
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*
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* The other formats are supported by PHP's stripcslashes,
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* except for the \s sequence (ASCII space).
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*
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* @param string $input The string to decode
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*
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* @return string
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*/
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public static function unvis($input)
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{
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$output = \preg_replace_callback(self::UNVIS_RX, 'self::unvisReplace', $input);
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// other escapes & octal are handled by stripcslashes
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return \stripcslashes($output);
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}
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/**
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* Callback for Str::unvis.
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*
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* @param array $match The matches passed by preg_replace_callback
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*
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* @return string
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*/
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protected static function unvisReplace($match)
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{
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// \040, \s
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if (!empty($match[1])) {
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return "\x20";
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}
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// \240
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if (!empty($match[2])) {
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return "\xa0";
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}
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// \M-(.)
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if (isset($match[3]) && $match[3] !== '') {
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$chr = $match[3];
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// unvis S_META1
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$cp = 0200;
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$cp |= \ord($chr);
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return \chr($cp);
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}
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// \M^(.)
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if (isset($match[4]) && $match[4] !== '') {
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$chr = $match[4];
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// unvis S_META | S_CTRL
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$cp = 0200;
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$cp |= ($chr === '?') ? 0177 : \ord($chr) & 037;
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return \chr($cp);
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}
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// \^(.)
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if (isset($match[5]) && $match[5] !== '') {
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$chr = $match[5];
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// unvis S_CTRL
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$cp = 0;
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$cp |= ($chr === '?') ? 0177 : \ord($chr) & 037;
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return \chr($cp);
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}
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}
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}
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