1 files changed, 98 insertions, 0 deletions
diff --git a/src/application/i18n.php b/src/application/i18n.php
new file mode 100644
index 0000000..964439f
--- /dev/null
+++ b/src/application/i18n.php
@@ -0,0 +1,98 @@
+<?php
+
+const MESSAGE_DIR = __DIR__ . "/messages";
+
+$__i18n_msg_store = [];
+$__i18n_current_locale = null;
+
+function i18n_parse(string $contents, ?string $filename = null): array {
+    $syntax_error = fn(string $msg, ?int $line = null): never =>
+        throw new Exception("i18n syntax error: $msg (in " . ($filename ?? "unknown") . ":" . ($line ?? 0) . ")");
+
+    $msgs = [];
+    $lines = explode("\n", $contents);
+    $currentId = "";
+    $currentContext = "";
+    $currentMessage = "";
+    $isInMessage = false;
+    foreach ($lines as $i => $ln) {
+        $lnNum = $i + 1;
+        if (trim($ln) === "")
+            continue;
+
+        switch ($ln[0]) {
+            case "#":
+                continue 2;
+            case ":":
+                if ($currentId !== "") {
+                    if ($currentContext !== "")
+                        $currentId = $currentContext . "\004" . $currentId;
+                    $msgs[$currentId] ??= $currentMessage;
+                }
+                $currentId = json_decode(substr($ln, 2));
+                $currentContext = "";
+                $currentMessage = "";
+                $isInMessage = false;
+                break;
+            case "=":
+                $isInMessage = true;
+                $currentMessage = json_decode(substr($ln, 2));
+                break;
+            case "?":
+                if ($isInMessage)
+                    $syntax_error("context must be defined before start of message", $lnNum);
+                $currentContext = json_decode(substr($ln, 2));
+                break;
+            case " ":
+                if ($isInMessage)
+                    $currentMessage .= json_decode(substr($ln, 2));
+                else
+                    $currentId .= json_decode(substr($ln, 2));
+                break;
+            default:
+                $syntax_error("invalid start of line '" . $ln[0] . "' (0x" . str_pad(strtoupper(dechex(ord($ln[0]))), 2, "0", STR_PAD_LEFT) . ")", $lnNum);
+                break;
+        }
+    }
+
+    if ($currentId !== "") {
+        if ($currentContext !== "")
+            $currentId = $currentContext . "\x7F" . $currentId;
+        $msgs[$currentId] ??= $currentMessage;
+    }
+    return $msgs;
+}
+
+function i18n_locale(string $locale) {
+    global $__i18n_current_locale;
+    $__i18n_current_locale = $locale;
+}
+
+function i18n_get(string $msgid, array $params = [], ?string $context = null): string {
+    global $__i18n_current_locale, $__i18n_msg_store;
+
+    $key = $msgid;
+    if ($context !== null)
+        $key = $context . "\x7F" . $msgid;
+
+    $msg = ($__i18n_msg_store[$__i18n_current_locale] ?? [])[$msgid] ?? $key;
+
+    uksort($params, fn(string $a, string $b): int => strlen($b) <=> strlen($a));
+    return str_replace(
+        array_map(fn(string $k): string => "%$k%", array_keys($params)),
+        array_values($params),
+        $msg
+    );
+}
+
+function __(string $msgid, array $params = [], ?string $context = null): string {
+    return i18n_get($msgid, $params, $context);
+}
+
+foreach (scandir(MESSAGE_DIR) as $ent) {
+    $path = MESSAGE_DIR . "/" . $ent;
+    if ($ent[0] === "." || !is_file($path) || strcasecmp(pathinfo($ent, PATHINFO_EXTENSION), "msg") !== 0)
+        continue;
+    $lang = pathinfo($ent, PATHINFO_FILENAME);
+    $__i18n_msg_store[$lang] = i18n_parse(file_get_contents($path), $ent);
+}