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libphutil/src/xsprintf/PhutilCommandString.php
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PhutilCommandString.php
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<?php
final class PhutilCommandString extends Phobject {
private $argv;
private $escapingMode = false;
const MODE_DEFAULT = 'default';
const MODE_POWERSHELL = 'powershell';
public function __construct(array $argv) {
$this->argv = $argv;
$this->escapingMode = self::MODE_DEFAULT;
// This makes sure we throw immediately if there are errors in the
// parameters.
$this->getMaskedString();
}
public function __toString() {
return $this->getMaskedString();
}
public function getUnmaskedString() {
return $this->renderString(true);
}
public function getMaskedString() {
return $this->renderString(false);
}
public function setEscapingMode($escaping_mode) {
$this->escapingMode = $escaping_mode;
return $this;
}
private function renderString($unmasked) {
return xsprintf(
'xsprintf_command',
array(
'unmasked' => $unmasked,
'mode' => $this->escapingMode,
),
$this->argv);
}
public static function escapeArgument($value, $mode) {
switch ($mode) {
case self::MODE_DEFAULT:
return escapeshellarg($value);
case self::MODE_POWERSHELL:
return self::escapePowershell($value);
default:
throw new Exception('Unknown escaping mode!');
}
}
private static function escapePowershell($value) {
// These escape sequences are from http://ss64.com/ps/syntax-esc.html
// Replace backticks first.
$value = str_replace('`', '``', $value);
// Now replace other required notations.
$value = str_replace("\0", '`0', $value);
$value = str_replace(chr(7), '`a', $value);
$value = str_replace(chr(8), '`b', $value);
$value = str_replace("\f", '`f', $value);
$value = str_replace("\n", '`n', $value);
$value = str_replace("\r", '`r', $value);
$value = str_replace("\t", '`t', $value);
$value = str_replace("\v", '`v', $value);
$value = str_replace('#', '`#', $value);
$value = str_replace("'", '`\'', $value);
$value = str_replace('"', '`"', $value);
// The rule on dollar signs is mentioned further down the page, and
// they only need to be escaped when using double quotes (which we are).
$value = str_replace('$', '`$', $value);
return '"'.$value.'"';
}
}
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