README

This Scramble extension was made as an experiment of how usable PhpParser may be when building extensions.

In essence, it allows you to scan JsonResource classes whose toArray features a dynamic return type through a match statement.

Install

composer require lifespikes/scramble-match-stmt

Then, in your scramble.php config file:

use LifeSpikes\ScrambleMatchStmt\ResourceWithMatchExtension;

...

'extensions' => [
    ResourceWithMatchExtension::class
]

Analyzing the code

Scramble gives us the FQN of the type being analyzed, using ReflectionClass, we get the file path of the class.

We fetch the contents and use Scramble's FileParser to get the AST of the file we intend to analyze. This returns a FileParserResult object that is essentially a PhpParser instance.

Once we have a file, we use the getMethod method to help us get to the toArray method easier.

Then, we traverse through the nodes:

• First we find the return statement
• Then the match
• And then we get the first MatchArm_

Lastly, we get the body of the MatchArm_ and verify it is an array.

Casting to Scramble types

We had to go digging and used code from the MethodAnalyzer and ArrayItemHandler classes.

Then we mimicked some of their behavior and re-used other internal classes like Scope and TypeHelper to cast our PhpParser nodes to Scramble types.

Lastly, we used the TypeTransformer to turn everything into an usable OpenAPI Schema.

More info?

Read the code, and some comments I sprinkled around for more details.