Export PHP interface to Typescript interface, or vice versa?

You can use amazing nikic/PHP-Parser to create a tool for converting selected PHP classes (those with @TypeScriptMe string in phpDoc) to TypeScript interfaces quite easily. The following script is really simple one but I think you can expand it and you can generate TypeScript interfaces automatically and possibly track changes through git.

Example

For this input:

<?php
/**
 * @TypeScriptMe
 */
class Person
{
    /**
     * @var string
     */
    public $name;

    /**
     * @var int
     */
    public $age;

    /**
     * @var \stdClass
     */
    public $mixed;

    /**
     * @var string
     */
    private $propertyIsPrivateItWontShow;
}

class IgnoreMe {

    public function test() {

    }
}

you'll get:

interface Person {
  name: string,
  age: number,
  mixed: any
}

Source codes

index.php:

<?php

namespace TypeScript {

    class Property_
    {
        /** @var string */
        public $name;
        /** @var string */
        public $type;

        public function __construct($name, $type = "any")
        {
            $this->name = $name;
            $this->type = $type;
        }

        public function __toString()
        {
            return "{$this->name}: {$this->type}";
        }
    }

    class Interface_
    {
        /** @var string */
        public $name;
        /** @var Property_[] */
        public $properties = [];

        public function __construct($name)
        {
            $this->name = $name;
        }

        public function __toString()
        {
            $result = "interface {$this->name} {\n";
            $result .= implode(",\n", array_map(function ($p) { return "  " . (string)$p;}, $this->properties));
            $result .= "\n}";
            return $result;
        }
    }
}

namespace MyParser {

    ini_set('display_errors', 1);
    require __DIR__ . "/vendor/autoload.php";

    use PhpParser;
    use PhpParser\Node;
    use TypeScript;

    class Visitor extends PhpParser\NodeVisitorAbstract
    {
        private $isActive = false;

        /** @var TypeScript/Interface_[] */
        private $output = [];

        /** @var TypeScript\Interface_ */
        private $currentInterface;

        public function enterNode(Node $node)
        {
            if ($node instanceof PhpParser\Node\Stmt\Class_) {

                /** @var PhpParser\Node\Stmt\Class_ $class */
                $class = $node;
                // If there is "@TypeScriptMe" in the class phpDoc, then ...
                if ($class->getDocComment() && strpos($class->getDocComment()->getText(), "@TypeScriptMe") !== false) {
                    $this->isActive = true;
                    $this->output[] = $this->currentInterface = new TypeScript\Interface_($class->name);
                }
            }

            if ($this->isActive) {
                if ($node instanceof PhpParser\Node\Stmt\Property) {
                    /** @var PhpParser\Node\Stmt\Property $property */
                    $property = $node;

                    if ($property->isPublic()) {
                        $type = $this->parsePhpDocForProperty($property->getDocComment());
                        $this->currentInterface->properties[] = new TypeScript\Property_($property->props[0]->name, $type);
                    }
                }
            }
        }

        public function leaveNode(Node $node)
        {
            if ($node instanceof PhpParser\Node\Stmt\Class_) {
                $this->isActive = false;
            }
        }

        /**
         * @param \PhpParser\Comment|null $phpDoc
         */
        private function parsePhpDocForProperty($phpDoc)
        {
            $result = "any";

            if ($phpDoc !== null) {
                if (preg_match('/@var[ \t]+([a-z0-9]+)/i', $phpDoc->getText(), $matches)) {
                    $t = trim(strtolower($matches[1]));

                    if ($t === "int") {
                        $result = "number";
                    }
                    elseif ($t === "string") {
                        $result = "string";
                    }
                }
            }

            return $result;
        }

        public function getOutput()
        {
            return implode("\n\n", array_map(function ($i) { return (string)$i;}, $this->output));
        }
    }

    ### Start of the main part


    $parser = new PhpParser\Parser(new PhpParser\Lexer\Emulative);
    $traverser = new PhpParser\NodeTraverser;
    $visitor = new Visitor;
    $traverser->addVisitor($visitor);

    try {
        // @todo Get files from a folder recursively
        //$code = file_get_contents($fileName);

        $code = <<<'EOD'
<?php
/**
 * @TypeScriptMe
 */
class Person
{
    /**
     * @var string
     */
    public $name;

    /**
     * @var int
     */
    public $age;

    /**
     * @var \stdClass
     */
    public $mixed;

    /**
     * @var string
     */
    private $propertyIsPrivateItWontShow;
}

class IgnoreMe {

    public function test() {

    }
}

EOD;

        // parse
        $stmts = $parser->parse($code);

        // traverse
        $stmts = $traverser->traverse($stmts);

        echo "<pre><code>" . $visitor->getOutput() . "</code></pre>";

    } catch (PhpParser\Error $e) {
        echo 'Parse Error: ', $e->getMessage();
    }
}

composer.json

{
    "name": "experiment/experiment",
    "description": "...",
    "homepage": "http://example.com",
    "type": "project",
    "license": ["Unlicense"],
    "authors": [
        {
            "name": "MrX",
            "homepage": "http://example.com"
        }
    ],
    "require": {
        "php": ">= 5.4.0",
        "nikic/php-parser": "^1.4"
    },
    "minimum-stability": "stable"
}