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<?php
/**
* @author Tassos.gr <info@tassos.gr>
* @link https://www.tassos.gr
* @copyright Copyright © 2024 Tassos All Rights Reserved
* @license GNU GPLv3 <http://www.gnu.org/licenses/gpl.html> or later
*/
namespace NRFramework\Parser;
defined('_JEXEC') or die;
use NRFramework\Parser\Parser;
use NRFramework\Parser\ConditionLexer;
/**
* ConditionParser
* LL(1) recursive-decent parser
* Uses NRFramework\Parser\ConditionLexer as input source
*
* Grammar:
* --------
* expr : condition (logic_op condition)* (option)*
* condition : {negate_op} alias (parameter)* | (alias|l_func) ({negate_op}? operator (values)? (parameter)*
* alias : {ident}
* values : value ({comma} value)*
* value : {quotedval} | ({literal} | {ident})+
* func : {ident} {l_paren} values {r_paren}
* l_func : func
* r_func : func
* parameter : {param} ({equals} value)?
* option : {ident} ({equals} value)?
* logic_op : {and} | {or}
* operator : {equals} | {starts_with} | {ends_with} | {empty} | {contains} | {contains_any} | {contains_all}| {contains_only} | {lt} | {lte} | {gt} | {gte}
*/
class ConditionParser extends Parser
{
/**
* Constructor
*
* @param ConditionLexer $input
*/
public function __construct(ConditionLexer $input)
{
parent::__construct($input, 2);
}
/**
* value : {quotedval} | ({literal} | {ident})+
*
* @return string
* @throws Exception
*/
public function value()
{
if ($this->lookahead[0]->type === 'quotedvalue')
{
$text = $this->lookahead[0]->text;
$this->match('quotedvalue');
return $text;
}
else if ($this->lookahead[0]->type !== 'ident' && $this->lookahead[0]->type !== 'literal')
{
throw new \Exception("Syntax error in ConditionParser::value(); expecting 'ident' or 'literal'; found {$this->lookahead[0]}");
}
$text = $this->lookahead[0]->text;
$this->consume();
while ($this->lookahead[0]->type === 'ident' || $this->lookahead[0]->type === 'literal')
{
$text .= ' ' . $this->lookahead[0]->text;
$this->consume();
}
return $text;
}
/**
* values : value ({comma} value)*
*
* @return array
*/
public function values()
{
$vals = [];
$vals[] = $this->value();
while ($this->lookahead[0]->type === 'comma')
{
$this->consume();
$vals[] = $this->value();
}
return $vals;
}
/**
* func : {ident} {l_paren} values {r_paren}
*
*/
public function func()
{
$func_name = $this->lookahead[0]->text;
$this->match('ident');
$this->match('l_paren');
if ($this->lookahead[0]->type === 'quotedvalue' ||
$this->lookahead[0]->type === 'ident' ||
$this->lookahead[0]->type === 'literal')
{
$func_args = $this->values();
}
$this->match('r_paren');
return ['func_name' => $func_name, 'func_args' => $func_args ?? []];
}
/**
* parameter : {param} ({equals} value)?
*
* @return string
*/
public function param()
{
$param = $this->lookahead[0]->text;
$value = true;
$this->match('param');
// If this is the 'context' parameter make sure that it appears as the last token
// if ($param === 'context')
// {
// $this->consume(); // consume the 'equals' operator
// $value = $this->value(); // expect a value
// if ($this->lookahead[0]->type !== 'EOF')
// {
// throw new \Exception("Syntax error in ConditionParser::param(); the 'context' parameter can only appear as the last token");
// }
// }
// else
if ($this->isOperator($this->lookahead[0]->type))
{
if ($this->lookahead[0]->type === 'equals')
{
$this->consume(); // consume the 'equals' operator
$value = $this->value(); // expect a value
}
else
{
// only the 'equals' operator is supported for the 'param' rule.
throw new \Exception("Syntax error in ConditionParser::param(); expecting 'equals', found {$this->lookahead[0]}");
}
}
return ['param' => $param, 'value' => $value];
}
/**
* alias : {ident}
*
* @return string
*/
public function alias()
{
$sel = $this->lookahead[0]->text;
$this->match('ident');
return $sel;
}
/**
* condition : {negate_op} alias (parameter)* | alias ({negate_op}? operator values)? (parameter)*
*
* @return object
*/
public function condition()
{
$result = [];
$operator = '';
$params = [];
$negate_op = false;
if ($this->lookahead[0]->type === 'negate_op')
{
$this->match('negate_op');
$operator = 'empty';
$result['alias'] = $this->alias();
}
else
{
if($this->lookahead[0]->type === 'ident' && $this->lookahead[1]->type === 'l_paren')
{
$l_func = $this->func();
$result['l_func_name'] = $l_func['func_name'];
$result['l_func_args'] = $l_func['func_args'];
}
else
{
$result['alias'] = $this->alias();
}
if ($this->lookahead[0]->type === 'negate_op')
{
$this->match('negate_op');
$negate_op = true;
// expect an operator after '!'
if (!$this->isOperator($this->lookahead[0]->type))
{
throw new Exceptions\SyntaxErrorException("Expecting an 'operator' after '!', found {$this->lookahead[0]}");
}
}
if ($this->isOperator($this->lookahead[0]->type))
{
$operator = $this->operator();
if($this->lookahead[0]->type === 'ident' && $this->lookahead[1]->type === 'l_paren')
{
$r_func = $this->func();
$result['r_func_name'] = $r_func['func_name'];
$result['r_func_args'] = $r_func['func_args'];
}
else if (
$this->lookahead[0]->type === 'quotedvalue' ||
$this->lookahead[0]->type === 'ident' ||
$this->lookahead[0]->type === 'literal'
)
{
$values = $this->values();
if (count($values) === 1)
{
$values = $values[0];
}
$result['values'] = $values;
}
}
}
while ($this->lookahead[0]->type === 'param')
{
$params[] = $this->param();
}
if (!$operator) {
$operator = 'empty';
$negate_op = true;
}
//
$_params = [];
foreach($params as $p)
{
$_params[$p['param']] = $p['value'];
}
$result['operator'] = $operator;
$result['negate_op'] = $negate_op;
$result['params'] = $_params;
return $result;
}
/**
* operator : {equals} | {starts_with} | {ends_with} | {empty} | {contains} | {contains_any} | {contains_all}| {contains_only} | {lt} | {lte} | {gt} | {gte}
*
* @return string
* @throws Exception
*/
public function operator()
{
if (!$this->isOperator($this->lookahead[0]->type))
{
throw new Exceptions\SyntaxErrorException("Expecting an 'operator', found " . $this->lookahead[0]);
}
$op = $this->lookahead[0]->type;
$this->consume();
return $op;
}
/**
* expr : condition ({logic_op} condition)* (option)*
*
* @return array The condition expression results
*/
public function expr()
{
$logic_op = 'and';
$res = [
'conditions' => [$this->condition()],
'logic_op' => 'and',
'context' => null,
'global_params' => []
];
if ($this->lookahead[0]->type === 'or')
{
$logic_op = 'or';
}
while ($this->lookahead[0]->type !== 'EOF')
{
$this->match($logic_op);
$res['conditions'][] = $this->condition();
}
$res['logic_op'] = $logic_op;
// check the last parsed condition for global parameters
$globalParams = [
'debug',
'dateformat',
'context',
'nopreparecontent',
'excludebots'
];
$last_params = $res['conditions'][count($res['conditions'])-1]['params'];
foreach(array_keys($last_params) as $param_key)
{
if (in_array(strtolower($param_key), $globalParams))
{
$res['global_params'][strtolower($param_key)] = $last_params[$param_key];
unset($res['conditions'][count($res['conditions'])-1]['params'][$param_key]);
}
}
// foreach ($last_params as $idx => $param)
// {
// if (in_array($param['param'], $globalParams))
// {
// $res['global_params'][$param['param']] = $param['value'];
// unset($res['conditions'][count($res['conditions'])-1]['params'][$idx]);
// }
// }
return $res;
}
/**
* Helper method that checks if the given Token is an operator.
*/
protected function isOperator($token_type)
{
return in_array($token_type, [
'equals',
'starts_with',
'ends_with',
'contains',
'contains_any',
'contains_all',
'contains_only',
'lt',
'lte',
'gt',
'gte',
'empty'
]);
}
}