makePhpstormMap.php

<?php
// Init framework
require 'app/Mage.php';
Mage::app();

// Factory methods to search for
$methods = array(
  'Mage::helper',
  'Mage::getModel',
  'Mage::getResourceModel',
  'Mage::getSingleton',
  'Mage::getResourceSingleton',
);

// Path to search for source files
$projectPath = 'app';
$sourceRegex = '/^.+\.(?:php|phtml)$/';

// Collect class names
$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($projectPath, FilesystemIterator::FOLLOW_SYMLINKS));
$files = new RegexIterator($iterator, $sourceRegex, RecursiveRegexIterator::GET_MATCH);
$classes = array();
foreach($files as $file) {
    $code = file_get_contents($file[0]) or die("Could not get contents of {$file[0]}\n");
    foreach($methods as $method) {
        if(preg_match_all('#'.preg_quote($method).'\s*\(\s*[\'"]([a-zA-Z0-9/_]+)[\'"]#', $code, $matches)) {
            if(empty($classes[$method])) $classes[$method] = array();
            foreach($matches[1] as $token) {
                if(isset($classes[$method][$token])) continue;
                try {
                    $instance = call_user_func($method, $token);
                    if($instance)
                      $classes[$method][$token] = get_class($instance);
                } catch(Exception $e){}
            }
        }
    }
}
echo json_encode($classes);