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Visitor Laravel Package
hoa/visitor
Hoa\Visitor is a lightweight PHP library for implementing the Visitor design pattern. It provides visitor and visitable interfaces plus base classes, making it easy to add operations to object structures without modifying their classes.
hoa/visitor is a small PHP implementation of the Visitor pattern. It separates algorithms from the objects they operate on: elements expose an accept method, while visitors implement the corresponding visit logic, making it easier to traverse and process complex object trees without modifying node classes.
- Clean separation of data structures and operations via
accept/visit. - Type-based dispatch for handling different element types.
- Extensible interfaces for custom elements and visitors.
- Versatile for traversal, validation, transformation, and code generation.
- Framework-agnostic and easy to install with Composer.
Frequently asked questions about Visitor
- What is hoa/visitor used for in PHP?
- Hoa/Visitor is a lightweight implementation of the Visitor design pattern. It defines element and visitor interfaces plus traversal helpers so you can add operations over object trees without modifying the visited classes. In a Laravel codebase it is a low-level utility, not a Laravel package.
- Is hoa/visitor compatible with Laravel 10 and Laravel 11?
- There is no Laravel-specific integration, so there is no service provider, config file, or facade to support Laravel 10 or 11 directly. Composer installation may work, but the package was last released in 2017 and is archived. You must prove PHP 8.1, 8.2, and 8.3 compatibility and Laravel 10 and 11 fit with an isolated compatibility spike.
- How do I install hoa/visitor with Composer?
- You can require hoa/visitor through Composer, but pin the exact version and inspect transitive Hoa dependencies before adopting it. Since the package is archived, commit the lockfile and test the install on your target PHP and Laravel matrix. If you only need visitor contracts, vendoring or inlining the minimal interfaces is often safer.
- Does hoa/visitor work with PHP 8?
- PHP 8 compatibility is not guaranteed because the package is archived and predates modern PHP maintenance. Run static analysis, deprecation checks, and tests under PHP 8.1, 8.2, and 8.3 before using it. If it fails, reimplement the small visitor contracts internally or choose a maintained alternative.
- Is hoa/visitor still maintained?
- No, the repository is archived and the last release was in 2017. There are no upstream security patches, PHP-version updates, or bug fixes. Your team would own any patches and security review, and scanners may flag the dependency as abandoned.
- Should I use hoa/visitor in a Laravel application?
- Use it only if a specific traversal use case justifies carrying an archived dependency. Most Laravel applications are better served by an app-owned Visitor or accept contract. If adopted, wrap it behind application interfaces and bind implementations through Laravel’s container rather than leaking Hoa types into controllers, models, or domain code.
- What are alternatives to hoa/visitor for PHP tree traversal?
- For PHP AST traversal, evaluate nikic/php-parser instead. For generic object graphs, an in-house visitor implementation or a maintained graph traversal library is usually cheaper than adopting an archived dependency. In Laravel, a small application service with recursive or iterative traversal often covers the need.
- How do I traverse object trees with Hoa\Visitor?
- Implement the visitor interface and the element accept method, then use the provided traversal helpers to walk the structure. Add depth limits and cycle detection for large or untrusted object graphs. Prefer iterative traversal where deep recursion could exhaust the stack or memory.
- Can hoa/visitor cause production or security risks?
- The main risk is lifecycle, not runtime: the package is archived, receives no patches, and may be flagged as abandoned by security scanners. Transitive Hoa dependencies can add further abandoned packages or version constraints. Runtime overhead is typically negligible, but deep recursion and cyclic graphs can still cause stack or memory failures.
- How should I test and isolate hoa/visitor in Laravel?
- Start with a compatibility spike on the exact PHP and Laravel versions used in CI and production. Run static analysis, deprecation checks, and contract tests around the traversal behavior. Isolate the dependency behind application-owned interfaces, bind it through the container if needed, and document an exit plan to inline or replace it.
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