Resolve the service code for the protobuf protocols

parse-protos-service.php

#!/usr/bin/env php
<?php

$src_dir    = __DIR__ . '/php-src';
$protos_dir = __DIR__ . '/protos';

foreach (new DirectoryIterator($protos_dir) as $file) {
    if ($file->isFile() && $file->getExtension() === 'proto') {
        generate_service_code($file->getPathname());
    }
}

function generate_service_code($file)
{
    echo "\nGenerate service code : $file\n----------------------------------\n";

    $content = file_get_contents($file);
    // echo $content;

    $package = get_package_name($content);
    echo "Package: $package\n";

    $services = get_service_list($content);
    echo "Services: \n";
    var_export($services);
}

function get_package_name($content)
{
    preg_match('/\npackage\s+([\w\.\_]+);\n/', $content, $matches);

    return isset($matches[1]) ? str_replace('.', '\\', $matches[1]) : '';
}

function get_service_list($content)
{
    $count = preg_match_all('/\n[ \t]*(rpc[ \t]+(.+?)[\};])/s', $content, $matches);

    if ($count == 0) {
        return [];
    }

    $services = [];
    foreach ($matches[1] as $line) {
        $services[] = parse_rpc_line($line);
    }

    return $services;
}

function parse_rpc_line($text)
{
    $patterns = [
        ''  => ['/rpc\s+/', '/\s*;$/', '/\s*\{(.+?)\}$/s', '/\s+returns\s+/s'],
        '.' => ['/[\(\)]/', '/\.\./'],
    ];

    foreach ($patterns as $replace => $pattern) {
        $text = preg_replace($pattern, $replace, $text);
    }

    return array_combine(['method', 'request', 'response'], explode('.', rtrim($text, '.')));
}