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libphutil/src/lexer/PhutilShellLexer.php
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PhutilShellLexer.php
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<?php
/**
* Lexer for shell-like argument strings. Somewhat similar to Python's shlex.
*
* @group lexer
*/
final class PhutilShellLexer extends PhutilLexer {
/**
* Convert a shell command string into an argument vector. For example, this
* converts a string like:
*
* a 'b c' "d"'"'"e" f\ g "\""
*
* ...into this argument vector:
*
* array(
* "a",
* "b c",
* "d\"e",
* "f g",
* "\"",
* );
*
* @param string Shell command string.
* @return array Parsed argument vector.
*/
public function splitArguments($string) {
$tokens = $this->getTokens($string);
if (count($this->getLexerState()) > 1) {
throw new UnexpectedValueException(
"Unterminated string in argument list!");
}
foreach ($tokens as $key => $token) {
switch ($token[0]) {
case "'":
case '"':
unset($tokens[$key]);
break;
case 'esc':
$tokens[$key][0] = 'arg';
$tokens[$key][1] = substr($token[1], 1);
break;
default:
break;
}
}
$tokens = $this->mergeTokens(array_values($tokens));
$argv = array();
foreach ($tokens as $token) {
if ($token[0] == 'arg') {
$argv[] = $token[1];
}
}
return $argv;
}
protected function getRawRules() {
return array(
'start' => array(
array('\s+', ' '),
array("'", "'", 'string1'),
array('"', '"', 'string2'),
array('\\\\.', 'esc'),
array('[^\\s\'"\\\\]+', 'arg'),
),
'string1' => array(
// NOTE: In a single-quoted string, backslash is not an escape.
array('[^\']+', 'arg'),
array("'", "'", '!pop'),
),
'string2' => array(
// NOTE: In a double-quoted string, backslash IS an escape, but only
// for some characters: ", $, `, \ and newline.
array('[^"\\\\]+', 'arg'),
array('"', '"', '!pop'),
array('\\\\["$`\\\\\\n]', 'esc'),
array('\\\\.', 'arg'),
),
);
}
}
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