json to protobuf definition transfer tool

j2p

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

if ($argc == 1) {
    $data = fgets(STDIN);
} else {
    $file = fopen($argv[1], 'r') or die('read file ' . $argv[1] . ' fail');
    $data = fread($file, filesize($argv[1]));
}

$json = json_decode($data) or die('parse input data fail');

echo "message Foobar {\n";
parseJson($json, '    ');
echo "}\n";

function parseJson($obj, $prefix)
{
    $count = 0;
    foreach ($obj as $key => $val) {
        $count++;
        switch (gettype($val)) {
            case 'boolean':
                echo $prefix . 'bool ' . $key . ' = ' . $count . ";\n";
                break;

            case 'integer':
                echo $prefix . 'int64 ' . $key . ' = ' . $count . ";\n";
                break;

            case 'double':
                echo $prefix . 'double ' . $key . ' = ' . $count . ";\n";
                break;

            case 'string':
                echo $prefix . 'string ' . $key . ' = ' . $count . ";\n";
                break;

            case 'NULL':
                echo $prefix . 'google.protobuf.Any ' . $key . ' = ' . $count . ";\n";
                break;

            case 'array':
                switch (gettype($val[0])) {
                    case 'boolean':
                        echo $prefix . 'repeated bool ' . $key . ' = ' . $count . ";\n";
                        break;

                    case 'integer':
                        echo $prefix . 'repeated int64 ' . $key . ' = ' . $count . ";\n";
                        break;

                    case 'double':
                        echo $prefix . 'repeated double ' . $key . ' = ' . $count . ";\n";
                        break;

                    case 'string':
                        echo $prefix . 'repeated string ' . $key . ' = ' . $count . ";\n";
                        break;

                    case 'NULL':
                        echo $prefix . 'repeated google.protobuf.Any ' . $key . ' = ' . $count . ";\n";
                        break;

                    default:
                        echo "\n";
                        echo  $prefix . 'message ' . $key . " {\n";
                        parseJson($val[0], '    ' . $prefix);
                        echo $prefix . "}\n";
                        echo $prefix . 'repeated ' . $key . ' ' . $key . ' = ' . $count . ";\n";
                        echo "\n";
                        break;
                }
                break;

            case 'object':
                echo "\n";
                echo  $prefix . 'message ' . $key . " {\n";
                parseJson($val, '    ' . $prefix);
                echo $prefix . "}\n";
                echo $prefix . $key . ' ' . $key . ' = ' . $count . ";\n";
                echo "\n";
                break;

            default:
                break;
        }
    }
}