Smart Punctuation Converter

<?php namespace Converter; // Author: Taufik Nurrohman <https://github.com/tovic> // <https://github.com/tovic/typography-plugin-for-mecha-cms/blob/master/typography/workers/converter.typography.php> /** * ==================================================================== * TYPOGRAPHY CONVERTER * ==================================================================== * * -- CODE: ----------------------------------------------------------- * * $parser = new Converter\Typography(); * * echo $parser->run('He said, "Yes, you\'re gross!"'); * * -------------------------------------------------------------------- * */ class Typography { // single quote [o, c] public $q = array('‘', '’'); // double quote [o, c] public $Q = array('“', '”'); // dash [n, m] public $d = array('–', '—'); // ellipsis [h] public $e = array('…'); // white-space(s) ... public $s = array(' ', ' '); // Skip parsing process if we are in these HTML tag(s) public $ignore = 'code|kbd|math|pre|script|style'; // Run converter ... public function run($text) { if( ! trim($text)) return $text; $_ = '#(<\/?[-:\w]+(?:>|\s[^<>]*?>))#'; $parts = preg_split($_, $text, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE); $text = ""; $x = 0; foreach($parts as $v) { if( ! trim($v)) { $text .= $v; continue; } if($v[0] === '<' && substr($v, -1) === '>') { if(preg_match('#^<(\/)?(?:' . $this->ignore . ')(?:>|\s[^<>]*?>)$#', $v, $m)) { $x = isset($m[1]) && $m[1] === '/' ? 0 : 1; } $text .= $v; // this is a HTML tag ... } else { $text .= ! $x ? $this->replace($v) : $v; // process or skip ... } } return $text; } // Replace character(s) ... protected function replace($text) { // Convert some HTML entiti(y|es) back // to their plain text version ... $text = str_replace( array('"', ''', '"', '&apos;'), array('"', "'", '"', "'"), $text); $text = $this->escape($text); $text = $this->nbsp($text); $text = $this->dot($text); $text = $this->dash($text); $text = $this->quote($text); return $text; } // From `'foo'` to `‘foo’` and `"bar"` to `“bar”` protected function quote($text) { $text = preg_replace( array( // single quote '#(?<=^|\W)\'(?!$)#', '#(?<!^)\'(?=\W|$)#', // double quote '#(?<=^|\W)"(?!$)#', '#(?<!^)"(?=\W|$)#' ), array( // single quote $this->q[0], $this->q[1], // double quote $this->Q[0], $this->Q[1] ), $text); // Fix for `foo”‘` and `foo’“` $text = str_replace( array( $this->Q[1] . $this->q[0], $this->q[1] . $this->Q[0] ), array( $this->Q[1] . $this->q[1], $this->q[1] . $this->Q[1] ), $text); // The rest of the quote(s) should be a closing quote(s) return str_replace(array("'", '"'), array($this->q[1], $this->Q[1]), $text); } // From `--` to `–` and `---` to `—` protected function dash($text) { return str_replace( array( '---', '--' ), array( $this->d[1], $this->d[0] ), $text); } // From `...` to `…` protected function dot($text) { return str_replace( array( '...', '. . .' ), $this->e[0], $text); } // ... protected function nbsp($text) { return preg_replace('#(?<=\S)\s+(?=[:;?!])#', $this->s[1], $text); } // Ignore parser with `\"foo\"` protected function escape($text) { return str_replace( array( '\\\\', '\"', "\'", '\.', '\-', '\`' ), array( '\', '"', ''', '.', '-', '`' ), $text); } // Reverse conversion, e.g. from `“foo”` to `"foo"` public function destroy($text) { return str_replace( array( $this->d[0], $this->d[1], $this->q[0], $this->q[1], $this->Q[0], $this->Q[1], $this->e[0], $this->s[0], $this->s[1] ), array( '--', '---', "'", "'", '"', '"', '...', ' ', ' ' ), $text); } }
Smaller than **SmartyPants** and `wptexturize` function.

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