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<?php
namespace Gajus\Dindent;
/**
* @link https://github.com/gajus/dindent for the canonical source repository
* @license https://github.com/gajus/dindent/blob/master/LICENSE BSD 3-Clause
*/
class Indenter {
private
$log = array(),
$options = array(
'indentation_character' => ' '
),
$inline_elements = array('b', 'big', 'i', 'small', 'tt', 'abbr', 'acronym', 'cite', 'code', 'dfn', 'em', 'kbd', 'strong', 'samp', 'var', 'a', 'bdo', 'br', 'img', 'span', 'sub', 'sup'),
$temporary_replacements_script = array(),
$temporary_replacements_inline = array();
const ELEMENT_TYPE_BLOCK = 0;
const ELEMENT_TYPE_INLINE = 1;
const MATCH_INDENT_NO = 0;
const MATCH_INDENT_DECREASE = 1;
const MATCH_INDENT_INCREASE = 2;
const MATCH_DISCARD = 3;
/**
* @param array $options
*/
public function __construct (array $options = array()) {
foreach ($options as $name => $value) {
if (!array_key_exists($name, $this->options)) {
throw new Exception\InvalidArgumentException('Unrecognized option.');
}
$this->options[$name] = $value;
}
}
/**
* @param string $element_name Element name, e.g. "b".
* @param ELEMENT_TYPE_BLOCK|ELEMENT_TYPE_INLINE $type
* @return null
*/
public function setElementType ($element_name, $type) {
if ($type === static::ELEMENT_TYPE_BLOCK) {
$this->inline_elements = array_diff($this->inline_elements, array($element_name));
} else if ($type === static::ELEMENT_TYPE_INLINE) {
$this->inline_elements[] = $element_name;
} else {
throw new Exception\InvalidArgumentException('Unrecognized element type.');
}
$this->inline_elements = array_unique($this->inline_elements);
}
/**
* @param string $input HTML input.
* @return string Indented HTML.
*/
public function indent ($input) {
$this->log = array();
// Dindent does not indent <script> body. Instead, it temporary removes it from the code, indents the input, and restores the script body.
if (preg_match_all('/<script\b[^>]*>([\s\S]*?)<\/script>/mi', $input, $matches)) {
$this->temporary_replacements_script = $matches[0];
foreach ($matches[0] as $i => $match) {
$input = str_replace($match, '<script>' . ($i + 1) . '</script>', $input);
}
}
// Removing double whitespaces to make the source code easier to read.
// With exception of <pre>/ CSS white-space changing the default behaviour, double whitespace is meaningless in HTML output.
// This reason alone is sufficient not to use Dindent in production.
$input = str_replace("\t", '', $input);
$input = preg_replace('/\s{2,}/', ' ', $input);
// Remove inline elements and replace them with text entities.
if (preg_match_all('/<(' . implode('|', $this->inline_elements) . ')[^>]*>(?:[^<]*)<\/\1>/', $input, $matches)) {
$this->temporary_replacements_inline = $matches[0];
foreach ($matches[0] as $i => $match) {
$input = str_replace($match, 'ᐃ' . ($i + 1) . 'ᐃ', $input);
}
}
$subject = $input;
$output = '';
$next_line_indentation_level = 0;
do {
$indentation_level = $next_line_indentation_level;
$patterns = array(
// block tag
'/^(<([a-z]+)(?:[^>]*)>(?:[^<]*)<\/(?:\2)>)/' => static::MATCH_INDENT_NO,
// DOCTYPE
'/^<!([^>]*)>/' => static::MATCH_INDENT_NO,
// tag with implied closing
'/^<(input|link|meta|base|br|img|source|hr)([^>]*)>/' => static::MATCH_INDENT_NO,
// self closing SVG tags
'/^<(animate|stop|path|circle|line|polyline|rect|use)([^>]*)\/>/' => static::MATCH_INDENT_NO,
// opening tag
'/^<[^\/]([^>]*)>/' => static::MATCH_INDENT_INCREASE,
// closing tag
'/^<\/([^>]*)>/' => static::MATCH_INDENT_DECREASE,
// self-closing tag
'/^<(.+)\/>/' => static::MATCH_INDENT_DECREASE,
// whitespace
'/^(\s+)/' => static::MATCH_DISCARD,
// text node
'/([^<]+)/' => static::MATCH_INDENT_NO
);
$rules = array('NO', 'DECREASE', 'INCREASE', 'DISCARD');
foreach ($patterns as $pattern => $rule) {
if ($match = preg_match($pattern, $subject, $matches)) {
$this->log[] = array(
'rule' => $rules[$rule],
'pattern' => $pattern,
'subject' => $subject,
'match' => $matches[0]
);
$subject = mb_substr($subject, mb_strlen($matches[0]));
if ($rule === static::MATCH_DISCARD) {
break;
}
if ($rule === static::MATCH_INDENT_NO) {
} else if ($rule === static::MATCH_INDENT_DECREASE) {
$next_line_indentation_level--;
$indentation_level--;
} else {
$next_line_indentation_level++;
}
if ($indentation_level < 0) {
$indentation_level = 0;
}
$output .= str_repeat($this->options['indentation_character'], $indentation_level) . $matches[0] . "\n";
break;
}
}
} while ($match);
$interpreted_input = '';
foreach ($this->log as $e) {
$interpreted_input .= $e['match'];
}
if ($interpreted_input !== $input) {
throw new Exception\RuntimeException('Did not reproduce the exact input.');
}
$output = preg_replace('/(<(\w+)[^>]*>)\s*(<\/\2>)/', '\\1\\3', $output);
foreach ($this->temporary_replacements_script as $i => $original) {
$output = str_replace('<script>' . ($i + 1) . '</script>', $original, $output);
}
foreach ($this->temporary_replacements_inline as $i => $original) {
$output = str_replace('ᐃ' . ($i + 1) . 'ᐃ', $original, $output);
}
return trim($output);
}
/**
* Debugging utility. Get log for the last indent operation.
*
* @return array
*/
public function getLog () {
return $this->log;
}
}
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