| ␊ |
| private static function makeNonPrintableCharsVisible($line)␊ |
| {␊ |
| // This translates most of the C0 ASCII control characters into␊ |
| // their visual counterparts in the 0x24## unicode plane␊ |
| // (http://en.wikipedia.org/wiki/C0_and_C1_control_codes).␊ |
| // We could add DEL (0x7F) to this set, but unfortunately this␊ |
| // is not nicely mapped to 0x247F in the control plane, but 0x2421␊ |
| // and adding an if expression below just for this is a little bit␊ |
| // of a hassle. And of course, the more esoteric ones from C1 are␊ |
| // missing as well...␊ |
| return preg_replace('/([\x00-\x1F])/ue',␊ |
| '"<span class=\"non-printable\" title=\"0x".strtoupper(bin2hex("\\1"))."\">".bin2hex("\\1")."</span>"',␊ |
| '"<span class=\"non-printable\" title=\"0x".bin2hex("\\1")."\">$".bin2hex("\\1")."</span>"',␊ |
| $line);␊ |
| }␊ |
| ␊ |
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