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|
<?php
namespace Core;
/**
* Lexer
*
* @package core
* @author Frederic Guillot
*/
class Lexer
{
/**
* Current position
*
* @access private
* @var integer
*/
private $offset = 0;
/**
* Token map
*
* @access private
* @var array
*/
private $tokenMap = array(
"/^(assignee:)/" => 'T_ASSIGNEE',
"/^(color:)/" => 'T_COLOR',
"/^(due:)/" => 'T_DUE',
"/^(status:)/" => 'T_STATUS',
"/^(title:)/" => 'T_TITLE',
"/^(\s+)/" => 'T_WHITESPACE',
'/^([<=>]{0,2}[0-9]{4}-[0-9]{2}-[0-9]{2})/' => 'T_DATE',
'/^(yesterday|tomorrow|today)/' => 'T_DATE',
'/^("(.*?)")/' => 'T_STRING',
"/^(\w+)/" => 'T_STRING',
);
/**
* Tokenize input string
*
* @access public
* @param string $input
* @return array
*/
public function tokenize($input)
{
$tokens = array();
$this->offset = 0;
while (isset($input[$this->offset])) {
$result = $this->match(substr($input, $this->offset));
if ($result === false) {
return array();
}
$tokens[] = $result;
}
return $tokens;
}
/**
* Find a token that match and move the offset
*
* @access public
* @param string $string
* @return array|boolean
*/
public function match($string)
{
foreach ($this->tokenMap as $pattern => $name) {
if (preg_match($pattern, $string, $matches)) {
$this->offset += strlen($matches[1]);
return array(
'match' => trim($matches[1], '"'),
'token' => $name,
);
}
}
return false;
}
/**
* Change the output of tokenizer to be easily parsed by the database filter
*
* Example: ['T_ASSIGNEE' => ['user1', 'user2'], 'T_TITLE' => 'task title']
*
* @access public
* @param array $tokens
* @return array
*/
public function map(array $tokens)
{
$map = array(
'T_TITLE' => '',
);
while (false !== ($token = current($tokens))) {
switch ($token['token']) {
case 'T_ASSIGNEE':
case 'T_COLOR':
$next = next($tokens);
if ($next !== false && $next['token'] === 'T_STRING') {
$map[$token['token']][] = $next['match'];
}
break;
case 'T_STATUS':
case 'T_DUE':
$next = next($tokens);
if ($next !== false && ($next['token'] === 'T_DATE' || $next['token'] === 'T_STRING')) {
$map[$token['token']] = $next['match'];
}
break;
default:
$map['T_TITLE'] .= $token['match'];
break;
}
next($tokens);
}
$map['T_TITLE'] = trim($map['T_TITLE']);
if (empty($map['T_TITLE'])) {
unset($map['T_TITLE']);
}
return $map;
}
}
|
