Generates entries for Psalm's CallMap from Reflection

generate-Psalm-CallMap.php

<?php

// Configure here the classes to export. Example:
$classes = [
    'GEOSGeometry',
    'GEOSWKBReader',
    'GEOSWKBWriter',
    'GEOSWKTReader',
    'GEOSWKTWriter'
];

// Sample output:
//
// 'GEOSGeometry::__construct' => ['void'],
// 'GEOSGeometry::__toString' => ['string'],
// 'GEOSGeometry::project' => ['float', 'other'=>'GEOSGeometry', 'normalized'=>'bool'],
// ...

$result = [];

foreach ($classes as $class) {
    $c = new ReflectionClass($class);

    $methods = $c->getMethods();

    foreach ($methods as $method) {
        $key = $class . '::' . $method->getName();

        if ($method->getName() === '__construct') {
            $returnType = 'void';
        } else {
            $returnType = reflectionTypeToString($method->getReturnType());
        }

        $value = [$returnType];

        foreach ($method->getParameters() as $parameter) {
            $value[$parameter->getName()] = reflectionTypeToString($parameter->getType());
        }

        $result[$key] = $value;
    }
}

foreach ($result as $method => $signature) {
    echo "'$method' => ['{$signature[0]}'";

    foreach ($signature as $name => $type) {
        if ($name !== 0) {
            echo ", '$name'=>'$type'";
        }
    }

    echo "],\n";
}

function reflectionTypeToString(?ReflectionType $reflectionType): string
{
    if ($reflectionType instanceof ReflectionNamedType) {
        $name = $reflectionType->getName();

        if ($reflectionType->allowsNull()) {
            $name .= '|null';
        }

        return $name;
    }

    if ($reflectionType instanceof ReflectionUnionType) {
        $types = array_map(fn(ReflectionNamedType $r) => $r->getName(), $reflectionType->getTypes());

        return implode('|', $types);
    }

    return 'mixed';
}