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phab/src/view/phui/PHUIInvisibleCharacterView.php
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PHUIInvisibleCharacterView.php
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<?php
/**
* API for replacing whitespace characters and some control characters with
* their printable representations. This is useful for debugging and
* displaying more helpful error messages to users.
*
*/
final class PHUIInvisibleCharacterView extends AphrontView {
private $inputText;
private $plainText = false;
// This is a list of the common invisible characters that are
// actually typeable. Other invisible characters will simply
// be displayed as their hex representations.
private static $invisibleChars = array(
"\x00" => 'NULL',
"\t" => 'TAB',
"\n" => 'NEWLINE',
"\x20" => 'SPACE',
);
public function __construct($input_text) {
$this->inputText = $input_text;
}
public function setPlainText($plain_text) {
$this->plainText = $plain_text;
return $this;
}
public function getStringParts() {
$input_text = $this->inputText;
$text_array = phutil_utf8v($input_text);
for ($ii = 0; $ii < count($text_array); $ii++) {
$char = $text_array[$ii];
$char_hex = bin2hex($char);
if (array_key_exists($char, self::$invisibleChars)) {
$text_array[$ii] = array(
'special' => true,
'value' => '<'.self::$invisibleChars[$char].'>',
);
} else if (ord($char) < 32) {
$text_array[$ii] = array(
'special' => true,
'value' => '<0x'.$char_hex.'>',
);
} else {
$text_array[$ii] = array(
'special' => false,
'value' => $char,
);
}
}
return $text_array;
}
private function renderHtmlArray() {
$html_array = array();
$parts = $this->getStringParts();
foreach ($parts as $part) {
if ($part['special']) {
$html_array[] = phutil_tag(
'span',
array('class' => 'invisible-special'),
$part['value']);
} else {
$html_array[] = $part['value'];
}
}
return $html_array;
}
private function renderPlainText() {
$parts = $this->getStringParts();
$res = '';
foreach ($parts as $part) {
$res .= $part['value'];
}
return $res;
}
public function render() {
require_celerity_resource('phui-invisible-character-view-css');
if ($this->plainText) {
return $this->renderPlainText();
} else {
return $this->renderHtmlArray();
}
}
}
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