json to protobuf definition transfer tool

j2p

#!/usr/bin/env php
<?php
$usage = "usage:\n\t" . $argv[0] . " <path_to_json_file>\n\t<pipe_json_string> | " . $argv[0] . " -\n";

function from_camel_case($input) {
  preg_match_all('!([A-Z][A-Z0-9]*(?=$|[A-Z][a-z0-9])|[A-Za-z][a-z0-9]+)!', $input, $matches);
  $ret = $matches[0];
  foreach ($ret as &$match) {
    $match = $match == strtoupper($match) ? strtolower($match) : lcfirst($match);
  }
  return implode('_', $ret);
}

function toCamelCase($words, $diff = true, $separator = '_')
{
    $split_words = str_replace($separator, " ", strtolower($words));
    $camel_words = str_replace(" ", "", ucwords($split_words));
    if ($diff && $words == $camel_words) {
        return $camel_words . 'T';
    }
    return $camel_words;
}

if ($argc == 1) {
    die($usage);
} elseif ($argv[1] == '-') {
    stream_set_blocking(STDIN, true);
    $data = stream_get_contents(STDIN) or die($usage);
    $name = 'Foobar';
} else {
    $file = fopen($argv[1], 'r') or die('read file ' . $argv[1] . " fail\n");
    $data = fread($file, filesize($argv[1]));
    $name = toCamelCase(str_split(basename($argv[1]))[0], false);
}



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

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



function parseJson($obj, $prefix, $blank_line = true)
{
    $count = 0;
    foreach ($obj as $key => $val) {
        $key=from_camel_case($key);
        $count++;
        switch (gettype($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:
                        if ($blank_line) {
                            echo "\n";
                        };
                        echo  $prefix . 'message ' . toCamelCase($key) . " {\n";
                        parseJson($val[0], '    ' . $prefix, false);
                        echo $prefix . "}\n";
                        echo $prefix . 'repeated ' . toCamelCase($key) . ' ' . $key . ' = ' . $count . ";\n";
                        echo "\n";
                        break;
                }
                break;

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

            default:
                break;
        }
    }
}