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<?php
/*
* This file is part of the webmozart/console package.
*
* (c) Bernhard Schussek <bschussek@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Webmozart\Console\Args;
/**
* Parses tokens from a string passed to {@link StringArgs}.
*
* @since 1.0
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class TokenParser
{
/**
* @var string
*/
private $string;
/**
* @var int
*/
private $cursor;
/**
* @var string|null
*/
private $current;
/**
* @var string|null
*/
private $next;
/**
* Parses the tokens from the given string.
*
* @param string $string The console arguments string.
*
* @return array The tokens.
*/
public function parseTokens($string)
{
$this->string = $string;
$this->cursor = 0;
$this->current = isset($this->string[0]) ? $this->string[0] : null;
$this->next = isset($this->string[1]) ? $this->string[1] : null;
// Unify result of ctype_space() across systems
$previousLocale = setlocale(LC_CTYPE, 0);
setlocale(LC_CTYPE, 'C');
$tokens = $this->doParseTokens();
setlocale(LC_CTYPE, $previousLocale);
return $tokens;
}
/**
* Advances the cursor to the next position.
*/
private function next()
{
if (!$this->valid()) {
return;
}
++$this->cursor;
$this->current = $this->next;
$this->next = isset($this->string[$this->cursor + 1]) ? $this->string[$this->cursor + 1] : null;
}
/**
* Returns whether the cursor position is valid.
*
* @return bool Returns `false` once the cursor moved beyond the end of the
* string and `true` otherwise.
*/
private function valid()
{
return null !== $this->current;
}
/**
* Parses an array of tokens.
*
* @return array The parsed tokens.
*/
private function doParseTokens()
{
$tokens = array();
while ($this->valid()) {
while (ctype_space($this->current)) {
// Skip spaces
$this->next();
}
if ($this->valid()) {
$tokens[] = $this->parseToken();
}
}
return $tokens;
}
/**
* Parses a single token.
*
* @return string The parsed token.
*/
private function parseToken()
{
$token = '';
while ($this->valid()) {
if (ctype_space($this->current)) {
// Skip space
$this->next();
break;
}
if ('\\' === $this->current) {
$token .= $this->parseEscapeSequence();
} elseif ("'" === $this->current || '"' === $this->current) {
$token .= $this->parseQuotedString();
} else {
$token .= $this->current;
$this->next();
}
}
return $token;
}
/**
* Parses a quoted string.
*
* The string is delimited by the current symbol.
*
* @return string The string without delimiting quotes..
*/
private function parseQuotedString()
{
$string = '';
$delimiter = $this->current;
// Skip first delimiter
$this->next();
while ($this->valid()) {
if ($delimiter === $this->current) {
// Skip last delimiter
$this->next();
break;
}
if ('\\' === $this->current) {
$string .= $this->parseEscapeSequence();
} elseif ('"' === $this->current) {
$string .= '"'.$this->parseQuotedString().'"';
} elseif ("'" === $this->current) {
$string .= "'".$this->parseQuotedString()."'";
} else {
$string .= $this->current;
$this->next();
}
}
return $string;
}
/**
* Parses an escape sequence started by a backslash.
*
* @return string The parsed sequence.
*/
private function parseEscapeSequence()
{
$sequence = "'" === $this->next || '"' === $this->next
? $this->next
: '\\'.$this->next;
$this->next();
$this->next();
return $sequence;
}
}