Pasta Lunch

Spaghetti Code Detection & Resolution

Detect tangled, complex code using PHPMD metrics, then analyze and propose specific fixes.

Workflow

Step 1: Run Detection

./vendor/bin/pasta-lunch src/

Or target specific directories:

./vendor/bin/pasta-lunch src/Resource,src/Service,src/Domain

Step 2: Identify Priority Targets

Focus on Mamma Mia! files first. These are structurally broken and cause:

• Bugs on every change
• Unpredictable side effects
• Impossible to test properly

Step 3: Analyze and Propose Solutions

For each Mamma Mia! file:

1. Read the file to understand the actual code
2. Identify the root cause (not just the symptom)
3. Propose specific refactoring with concrete code

Metrics and Thresholds

Issue Analysis Guide

When analyzing a detected issue, provide:

1. Problem Explanation

• What the metric measures
• Why this value is problematic
• Link to documentation: https://koriym.github.io/pasta-lunch/issues/en/{issue-name}

2. Root Cause Analysis

• Read the actual file
• Identify why the metric is high
• Common patterns:
  • High CBO: Class doing too many things, needs responsibility extraction
  • High CC: Too many conditionals, needs strategy pattern or early returns
  • High NPath: Deep nesting, needs guard clauses
  • High ECC: God class, needs splitting
  • TooManyFields: DTO bloat, needs decomposition
  • ExcessiveParameterList: Missing value object or configuration object

3. Concrete Refactoring Proposal

• Show before/after code
• Explain the transformation
• Keep changes minimal and focused

Refactoring Patterns

High CBO: Extract Service

// Before: CBO=22 - Resource doing everything
class Import extends ResourceObject
{
    public function __construct(
        private readonly DbInterface $db,
        private readonly CacheInterface $cache,
        private readonly LoggerInterface $logger,
        private readonly ValidatorInterface $validator,
        // ... 18 more dependencies
    ) {}

    public function onPost(array $data): static
    {
        // 200 lines of import logic
    }
}

// After: CBO=2 - Resource delegates to Service
class Import extends ResourceObject
{
    public function __construct(
        private readonly ImportService $service,
    ) {}

    public function onPost(array $data): static
    {
        $this->body = $this->service->import($data);
        return $this;
    }
}

High CC: Strategy Pattern

// Before: CC=18
public function process(string $type, array $data): Result
{
    if ($type === 'order') {
        // 30 lines
    } elseif ($type === 'refund') {
        // 25 lines
    } elseif ($type === 'exchange') {
        // 35 lines
    }
    // ... more branches
}

// After: CC=2
public function process(string $type, array $data): Result
{
    $processor = $this->processorFactory->create($type);
    return $processor->process($data);
}

High NPath: Guard Clauses

// Before: NPath=512
public function calculate(Order $order): int
{
    if ($order->hasItems()) {
        if ($order->isValid()) {
            if ($order->customer !== null) {
                if ($order->customer->hasDiscount()) {
                    // calculation with discount
                } else {
                    // calculation without discount
                }
            }
        }
    }
    return 0;
}

// After: NPath=8
public function calculate(Order $order): int
{
    if (!$order->hasItems()) {
        return 0;
    }
    if (!$order->isValid()) {
        return 0;
    }
    if ($order->customer === null) {
        return 0;
    }

    $base = $this->calculateBase($order);
    return $order->customer->hasDiscount()
        ? $this->applyDiscount($base, $order->customer)
        : $base;
}

TooManyFields: Decompose DTO

// Before: 30 fields
class Article
{
    public function __construct(
        public readonly int $id,
        public readonly string $title,
        public readonly string $body,
        public readonly string $authorName,
        public readonly string $authorEmail,
        public readonly string $authorBio,
        public readonly string $metaTitle,
        public readonly string $metaDescription,
        public readonly array $metaKeywords,
        // ... 21 more fields
    ) {}
}

// After: Composed of value objects
class Article
{
    public function __construct(
        public readonly int $id,
        public readonly string $title,
        public readonly string $body,
        public readonly Author $author,
        public readonly Meta $meta,
        public readonly PublishInfo $publishInfo,
    ) {}
}

ExcessiveParameterList: Parameter Object

// Before: 12 parameters
public function createUser(
    string $name,
    string $email,
    string $password,
    string $phone,
    string $address,
    string $city,
    string $country,
    string $postalCode,
    bool $newsletter,
    bool $terms,
    ?string $referral,
    ?string $coupon,
): User

// After: Parameter object
public function createUser(CreateUserRequest $request): User

Output Format

When presenting results:

## 🍝 Spaghetti Code Detection

### Summary
- Total files: 150
- Piccolo: 120 (80%)
- Medio: 15 (10%)
- Grande: 10 (6.7%)
- Mamma Mia!: 5 (3.3%)

### Mamma Mia! Files (Immediate Action Required)

#### 1. Service/OrderProcessor.php

**Detected Issues:**
- CyclomaticComplexity: 28 (threshold: 10) in `processOrder()`
- NPathComplexity: 1024 (threshold: 100) in `processOrder()`
- CouplingBetweenObjects: 22 (threshold: 10)

**Root Cause:**
[After reading the file, explain what's actually wrong]

**Proposed Fix:**
[Show concrete refactoring code]

📖 Reference: [CyclomaticComplexity](https://koriym.github.io/pasta-lunch/issues/en/cyclomatic-complexity)

References

• Issue Types (EN)
• Issue Types (JA)
• PHPMD Code Size Rules
• PHPMD Design Rules

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