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@lolandese

lolandese/unindent.php

Last active October 1, 2019 15:14
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Removes excessive indenting that consist of spaces or tabs
Raw
unindent.php
<?php
$str = " This is a test
string spanning
multiple lines.
It contains three
sentences, each are
split on three lines.
The indentation decides
which lines belongs
to which sentence.";
$str = unindent($str);
echo '<pre>'.$str.'</pre>';
function unindent($snippet) {
// Add a line break to include the first line for space/tab removal.
$snippet = PHP_EOL . $snippet;
// Remove the preceding space of every line until any line runs out of it.
while (!preg_match('/' . PHP_EOL . '\S/', $snippet)) {
$snippet = preg_replace('/' . PHP_EOL . '[ \t]/', PHP_EOL, $snippet);
}
// Remove the added preceding line break and any trailing whitespace.
return trim($snippet);
}
?>
@lolandese
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lolandese commented Sep 11, 2019 •
edited
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It consists of a loop that removes the first space of each line until any line does not start with a space or tab anymore.

Input

      This is a test                    
        string spanning 
        multiple lines.
      It contains three 
        sentences, each are 
        split on three lines.
      The indentation decides 
        which lines belongs 
        to which sentence.

Output

This is a test                    
  string spanning 
  multiple lines.
It contains three 
  sentences, each are 
  split on three lines.
The indentation decides 
  which lines belongs 
  to which sentence.

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