po_to_json.php

<?php
/**
 * PO to JSON.
 */
$lang = "fr";
$lines = explode("\n", file_get_contents(__DIR__ . "/text.po"));
array_shift($lines); array_shift($lines); // Ignore first two lines

$out = [];

function nextline() {
  global $lines;
  if (count($lines) === 0) {
    return false;
  }

next:
  $line = array_shift($lines);
  if ($line === null) return false;
  $line = trim($line);
  if (strlen($line) === 0) goto next;          // empty line
  $cmd = substr($line, 0, strpos($line, " "));
  if (substr($line, 0, 1) === '"') goto next;                   // comment "xxxx"
  $line = substr($line, strlen($cmd)+1);

  return [$cmd, $line];
}

$keygroups = [];
while(true) {
  $res = nextline();
  if ($res === false) break;
  list($cmd, $line) = $res;

  if ($cmd === '#:') {
    $keys = explode(".", explode(":", $line)[1]);
    if (count($keys) === 1) {
      var_dump($line, $keys); die("ERR");
    }
    array_shift($keys); array_shift($keys); // strip off translation.json
    $keygroups[] = $keys;
  }

  if ($cmd === "msgstr") {
    // Step in array
    foreach ($keygroups as $keys) {
      $last = &$out;

      foreach ($keys as $i => $key) {
        $is_val = $i+1 === count($keys);
        if ($key === "ppf") {
            if (! isset($last[$key])) $last[$key] = [];
            $last = &$last[$key];

            // combine remaining
            $key = implode(".", array_slice($keys, $i+1));
            $is_val = true;
        }

        if ($is_val) {
          $last[$key] = mb_substr($line, 1, mb_strlen($line)-2); // set value without ""
          break;
        } else {
          // one deeper
          if (! isset($last[$key])) $last[$key] = [];
          $last = &$last[$key];
        }
      }
    }
    $keygroups = []; // reset
  }
}

file_put_contents(__DIR__ . "/translation.json", json_encode($out, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE));