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<?php
/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
namespace Icinga\Data\Filter;
class FilterQueryString
{
protected $string;
protected $pos;
protected $debug = array();
protected $reportDebug = false;
protected $length;
protected function __construct()
{
}
protected function debug($msg, $level = 0, $op = null)
{
if ($op === null) {
$op = 'NULL';
}
$this->debug[] = sprintf(
'%s[%d=%s] (%s): %s',
str_repeat('* ', $level),
$this->pos,
$this->string[$this->pos - 1],
$op,
$msg
);
}
public static function parse($string)
{
$parser = new static();
return $parser->parseQueryString($string);
}
protected function readNextKey()
{
$str = $this->readUnlessSpecialChar();
if ($str === false) {
return $str;
}
return rawurldecode($str);
}
protected function readNextValue()
{
if ($this->nextChar() === '(') {
$this->readChar();
$var = preg_split('~\|~', $this->readUnless(')'));
if ($this->readChar() !== ')') {
$this->parseError(null, 'Expected ")"');
}
} else {
$var = rawurldecode($this->readUnless(array(')', '&', '|', '>', '<')));
}
return $var;
}
protected function readNextExpression()
{
if ('' === ($key = $this->readNextKey())) {
return false;
}
foreach (array('<', '>') as $sign) {
if (false !== ($pos = strpos($key, $sign))) {
if ($this->nextChar() === '=') {
break;
}
$var = substr($key, $pos + 1);
$key = substr($key, 0, $pos);
if (ctype_digit($var)) {
$var = (float) $var;
}
return Filter::expression($key, $sign, $var);
}
}
if (in_array($this->nextChar(), array('=', '>', '<', '!'))) {
$sign = $this->readChar();
} else {
$sign = false;
}
if ($sign === false) {
return Filter::expression($key, '=', true);
}
$toFloat = false;
if ($sign === '=') {
$last = substr($key, -1);
if ($last === '>' || $last === '<') {
$sign = $last . $sign;
$key = substr($key, 0, -1);
$toFloat = true;
}
// TODO: Same as above for unescaped <> - do we really need this?
} elseif ($sign === '>' || $sign === '<' || $sign === '!') {
$toFloat = $sign === '>' || $sign === '<';
if ($this->nextChar() === '=') {
$sign .= $this->readChar();
}
}
$var = $this->readNextValue();
if ($toFloat && ctype_digit($var)) {
$var = (float) $var;
}
return Filter::expression($key, $sign, $var);
}
protected function parseError($char = null, $extraMsg = null)
{
if ($extraMsg === null) {
$extra = '';
} else {
$extra = ': ' . $extraMsg;
}
if ($char === null) {
$char = $this->string[$this->pos];
}
if ($this->reportDebug) {
$extra .= "\n" . implode("\n", $this->debug);
}
throw new FilterParseException(
'Invalid filter "%s", unexpected %s at pos %d%s',
$this->string,
$char,
$this->pos,
$extra
);
}
protected function readFilters($nestingLevel = 0, $op = null)
{
$filters = array();
while ($this->pos < $this->length) {
if ($op === '!' && count($filters) === 1) {
break;
}
$filter = $this->readNextExpression();
$next = $this->readChar();
if ($filter === false) {
$this->debug('Got no next expression, next is ' . $next, $nestingLevel, $op);
if ($next === '!') {
$not = $this->readFilters($nestingLevel + 1, '!');
$filters[] = $not;
if (in_array($this->nextChar(), array('|', '&', ')'))) {
$next = $this->readChar();
$this->debug('Got NOT, next is now: ' . $next, $nestingLevel, $op);
} else {
$this->debug('Breaking after NOT: ' . $not, $nestingLevel, $op);
break;
}
}
if ($op === null && count($filters) > 0 && ($next === '&' || $next === '|')) {
$op = $next;
continue;
}
if ($next === false) {
// Nothing more to read
break;
}
if ($next === ')') {
if ($nestingLevel > 0) {
$this->debug('Closing without filter: ' . $next, $nestingLevel, $op);
break;
}
$this->parseError($next);
}
if ($next === '(') {
$filters[] = $this->readFilters($nestingLevel + 1, null);
continue;
}
if ($next === $op) {
continue;
}
$this->parseError($next, "$op level $nestingLevel");
} else {
$this->debug('Got new expression: ' . $filter, $nestingLevel, $op);
$filters[] = $filter;
if ($next === false) {
$this->debug('Next is false, nothing to read but got filter', $nestingLevel, $op);
// Got filter, nothing more to read
break;
}
if ($op === '!') {
$this->pos--;
break;
}
if ($next === $op) {
$this->debug('Next matches operator', $nestingLevel, $op);
continue; // Break??
}
if ($next === ')') {
if ($nestingLevel > 0) {
$this->debug('Closing with filter: ' . $next, $nestingLevel, $op);
break;
}
$this->parseError($next);
}
if ($op === null && in_array($next, array('&', '|'))) {
$this->debug('Setting op to ' . $next, $nestingLevel, $op);
$op = $next;
continue;
}
$this->parseError($next);
}
}
if ($nestingLevel === 0 && $this->pos < $this->length) {
$this->parseError($op, 'Did not read full filter');
}
if ($nestingLevel === 0 && count($filters) === 1 && $op !== '!') {
// There is only one filter expression, no chain
$this->debug('Returning first filter only: ' . $filters[0], $nestingLevel, $op);
return $filters[0];
}
if ($op === null && count($filters) === 1) {
$this->debug('No op, single filter, setting AND', $nestingLevel, $op);
$op = '&';
}
$this->debug(sprintf('Got %d filters, returning', count($filters)), $nestingLevel, $op);
switch ($op) {
case '&':
return Filter::matchAll($filters);
case '|':
return Filter::matchAny($filters);
case '!':
return Filter::not($filters);
case null:
return Filter::matchAll();
default:
$this->parseError($op);
}
}
protected function parseQueryString($string)
{
$this->pos = 0;
$this->string = $string;
$this->length = $string ? strlen($string) : 0;
if ($this->length === 0) {
return Filter::matchAll();
}
return $this->readFilters();
}
protected function readUnless($char)
{
$buffer = '';
while (false !== ($c = $this->readChar())) {
if (is_array($char)) {
if (in_array($c, $char)) {
$this->pos--;
break;
}
} else {
if ($c === $char) {
$this->pos--;
break;
}
}
$buffer .= $c;
}
return $buffer;
}
protected function readUnlessSpecialChar()
{
return $this->readUnless(array('=', '(', ')', '&', '|', '>', '<', '!'));
}
protected function readExpressionOperator()
{
return $this->readUnless(array('=', '>', '<', '!'));
}
protected function readChar()
{
if ($this->length > $this->pos) {
return $this->string[$this->pos++];
}
return false;
}
protected function nextChar()
{
if ($this->length > $this->pos) {
return $this->string[$this->pos];
}
return false;
}
}
|
