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<?php
/**
* @author Robin Appelman
* @copyright 2013 Robin Appelman icewind@owncloud.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC;
class SyntaxException extends \Exception {
}
class ArrayParser {
const TYPE_NUM = 1;
const TYPE_BOOL = 2;
const TYPE_STRING = 3;
const TYPE_ARRAY = 4;
/**
* @param string $string
* @return array|bool|int|null|string
*/
function parsePHP($string) {
$string = $this->stripPHPTags($string);
$string = $this->stripAssignAndReturn($string);
return $this->parse($string);
}
/**
* @param string $string
* @return string
*/
function stripPHPTags($string) {
$string = trim($string);
if (substr($string, 0, 5) === '<?php') {
$string = substr($string, 5);
}
if (substr($string, -2) === '?>') {
$string = substr($string, 0, -2);
}
return $string;
}
/**
* @param string $string
* @return string
*/
function stripAssignAndReturn($string) {
$string = trim($string);
if (substr($string, 0, 6) === 'return') {
$string = substr($string, 6);
}
if (substr($string, 0, 1) === '$') {
list(, $string) = explode('=', $string, 2);
}
return $string;
}
/**
* @param string $string
* @return array|bool|int|null|string
*/
function parse($string) {
$string = trim($string);
$string = trim($string, ';');
switch ($this->getType($string)) {
case self::TYPE_NUM:
return $this->parseNum($string);
case self::TYPE_BOOL:
return $this->parseBool($string);
case self::TYPE_STRING:
return $this->parseString($string);
case self::TYPE_ARRAY:
return $this->parseArray($string);
}
return null;
}
/**
* @param string $string
* @return int
*/
function getType($string) {
$string = strtolower($string);
$first = substr($string, 0, 1);
$last = substr($string, -1, 1);
$arrayFirst = substr($string, 0, 5);
if (($first === '"' or $first === "'") and ($last === '"' or $last === "'")) {
return self::TYPE_STRING;
} elseif ($string === 'false' or $string === 'true') {
return self::TYPE_BOOL;
} elseif ($arrayFirst === 'array' and $last === ')') {
return self::TYPE_ARRAY;
} else {
return self::TYPE_NUM;
}
}
/**
* @param string $string
* @return string
*/
function parseString($string) {
return substr($string, 1, -1);
}
/**
* @param string $string
* @return int
*/
function parseNum($string) {
return intval($string);
}
/**
* @param string $string
* @return bool
*/
function parseBool($string) {
$string = strtolower($string);
return $string === 'true';
}
/**
* @param string $string
* @return array
*/
function parseArray($string) {
$body = substr($string, 5);
$body = trim($body);
$body = substr($body, 1, -1);
$items = $this->splitArray($body);
$result = array();
$lastKey = -1;
foreach ($items as $item) {
$item = trim($item);
if ($item) {
if (strpos($item, '=>')) {
list($key, $value) = explode('=>', $item, 2);
$key = $this->parse($key);
$value = $this->parse($value);
} else {
$key = ++$lastKey;
$value = $item;
}
if (is_numeric($key)) {
$lastKey = $key;
}
$result[$key] = $value;
}
}
return $result;
}
/**
* @param string $body
* @return array
*/
function splitArray($body) {
$inSingleQuote = false;//keep track if we are inside quotes
$inDoubleQuote = false;
$bracketDepth = 0;//keep track if we are inside brackets
$parts = array();
$start = 0;
$escaped = false;//keep track if we are after an escape character
$skips = array();//keep track of the escape characters we need to remove from the result
if (substr($body, -1, 1) !== ',') {
$body .= ',';
}
for ($i = 0; $i < strlen($body); $i++) {
$char = substr($body, $i, 1);
if ($char === '\\') {
if ($escaped) {
array_unshift($skips, $i - 1);
}
$escaped = !$escaped;
} else {
if ($char === '"' and !$inSingleQuote) {
if ($escaped) {
array_unshift($skips, $i - 1);
} else {
$inDoubleQuote = !$inDoubleQuote;
}
} elseif ($char === "'" and !$inDoubleQuote) {
if ($escaped) {
array_unshift($skips, $i - 1);
} else {
$inSingleQuote = !$inSingleQuote;
}
} elseif (!$inDoubleQuote and !$inSingleQuote) {
if ($char === '(') {
$bracketDepth++;
} elseif ($char === ')') {
if ($bracketDepth <= 0) {
throw new SyntaxException;
} else {
$bracketDepth--;
}
} elseif ($bracketDepth === 0 and $char === ',') {
$part = substr($body, $start, $i - $start);
foreach ($skips as $skip) {
$part = substr($part, 0, $skip - $start) . substr($part, $skip - $start + 1);
}
$parts[] = $part;
$start = $i + 1;
$skips = array();
}
}
$escaped = false;
}
}
return $parts;
}
}
|
