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PSR-4 Converter

PSR-4 Converter is a tool to automate the conversion of PSR-0 or non-standard codes to PSR-4 compliance codes. To convert the php code (support codebase with PHP >= 5.0), this tool statically parses the code and then all the code is scanned to find the definitions that will be changed. Making legacy code compiler with PSR-4 involves more steps than renaming namespaces, this tool solves the following problems with this conversion:

1. Ensure that there is only one class per php file;
2. Possibility of converting names from PSR-0 to PSR-4, converting underscore to namespace;
3. Prefix existing namespaces with a vendor namespace;
4. Create class_alias from the old class to the new one to ensure dynamic calls (class reference by variables);
5. Validation of invalid statements that cannot be converted in php files;
6. Creating include files with conditional functions and definitions to be included using composer.
7. Automatic generation of autoload file to load old classes, delivering the new class instead.
8. Possibility to ignore namespaces and directories.
9. Creation of a mapping json file, allowing to use it to automate other steps.
10. Rename all references from the old names to the new class and function names.
11. Rename all references in DocBlocks from the old names to the new class and function names.
12. Refactoring the imports to use the new converted names.
13. Risky conversion alert.
14. Checksum validation, allowing you to use pre-existing mapping files safely.

Instalation

You can install this library in several ways.

composer

1. Add the dependency to your composer require lesphp/psr4-converter project. It is recommended to install globally via the command composer require --global lesphp/psr4-converter.

2. Run the PSR-4 Converter via the command php vendor/bin/psr4-converter help or psr4-converter help if installed globally.

Phive

1. Install PSR-4 from phive with the command phive install --force-accept-unsigned lesphp/psr4-converter

2. Run PSR-4 Converter via psr4-converter help command.

Usage

Mapping

The map command will generate a mapping json file containing all the information needed for the conversion, including all old and new name mappings.

For example the above command will generate the mapping file /tmp/.psr4-converter.json with all conversions to the /path/to/source directory, will also:

• Use the App vendor namespace for the new converted names, so a \Old\Name class will be \App\Old\Name;
• With the --underscore-conversion option an Old_Name2 class will become \App\Old\Name2;
• With the option --append-namespace the vendor namespace App will always be added to the new name, without this option a class \App\Old\Name3 would become \App\Old\Name3, with this option it will become \App\App\Old\Name3;
• With the --ignore-namespaced-underscore option underscores in old names will be kept for classes that are already namespaced, then a class \Old\Name_Four would become \App\Old\Name_Four.

Use the psr4-converter map --help command to get more details on the arguments and possibilities of the command.

Converting

Using the mapping file it is possible to convert the code to a new directory through the following command.

It will convert the code mapped in /tmp/.psr4-converter.json to the /path/to/destination directory, will also:

• Definitions that need to be statically included by composer will be created in /path/to/destination/includes .
• With the -m option it is possible to add other mapping files to be used only to rename the classes mapped in the additional file, so the conversion will already have the new names of the additional mapping.
• With the option --ignore-vendor-path the vendor path will be ignored for generating the path of the converted file, so a class with new name \App\New\Name will be in /path/to/destination/New/Name.php, this is useful for doing psr-4 mappings in composer.json.
• With the --create-aliases option a file will be created in /path/to/destination/includes/autoload.php, that can be statically included in composer to autoload the old names, keeping compatibility for dynamic calls of the old names.
• With the --allow-risky option the tool will allow the conversion even if there is some risk mapped.

Use the psr4-converter convert --help command to get more details on the arguments and possibilities of the command.

Renaming

Using the mapping file it is possible to rename the mapped references, so the old names will be converted to the new names. Use the rename command like this psr4-converter rename /tmp/.psr4-converter.json /path/to/destination. The convert command already renames the converted code, so the rename command is useful only to rename another already existent code.

Use the psr4-converter rename --help command to get more details on the arguments and possibilities of the command.

Inspecting

Using the mapping file it is possible to inspect the mapped changes. Use the inspect command like this psr4-converter inspect /tmp/.psr4-converter.json. Using the option -o names-changes is possible to get a json from changed names.

Use the psr4-converter inspect --help command to get more details on the arguments and possibilities of the command.