a parser that is able to deal with the right number of args

framework/yii/i18n/MessageFormatter.php

@@ -64,16 +64,41 @@ class MessageFormatter extends \MessageFormatter
 	private static function replaceNamedArguments($pattern, $args)
 	{
 		$map = array_flip(array_keys($args));
-		return preg_replace_callback('~({\s*)([\d\w]+)(\s*[,}])~u', function ($input) use ($map) {
-			$name = $input[2];
-			if (isset($map[$name])) {
-				return $input[1] . $map[$name] . $input[3];
-			}
-			else {
-				//return $input[1] . $name . $input[3];
-				return "'" . $input[1] . $name . $input[3] . "'";
+
+		// parsing http://icu-project.org/apiref/icu4c/classMessageFormat.html#details
+		$parts = explode('{', $pattern);
+		$c = count($parts);
+		$pattern = $parts[0];
+		$d = 0;
+		$stack = array();
+		for($i = 1; $i < $c; $i++) {
+			if (preg_match('~^\A(\s*)([\d\w]+)(\s*)([},])(\s*)(.*)\z$~u', $parts[$i], $matches)) {
+				$d++;
+				// replace normal arg if it was set
+				if (isset($map[$matches[2]])) {
+					$q = '';
+					$pattern .= '{' . $matches[1] . $map[$matches[2]] . $matches[3];
+				} else {
+					// quote unused args
+					$q = '';//($matches[4] == '}' && isset($stack[$d]) && !($stack[$d] == 'plural' || $stack[$d] == 'select')) ? "'" : "";
+					$pattern .= "$q{" . $matches[1] . $matches[2] . $matches[3];
+				}
+				$pattern .= ($term = $matches[4] . $q . $matches[5] . $matches[6]);
+				// check type current level
+				$stack[$d] = ($matches[4] == ',') ? substr($matches[6], 0, 6) : 'none';
+				// if it's plural or select, the next bracket is NOT begin of a message then!
+				if ($stack[$d] == 'plural' || $stack[$d] == 'select') {
+					$i++;
+					$d -= substr_count($term, '}');
+				} else {
+					$d -= substr_count($term, '}');
+					continue;
+				}
 			}
-		}, $pattern);
+			$pattern .= '{' . $parts[$i];
+			$d += 1 - substr_count($parts[$i], '}');
+		}
+		return $pattern;
 	}
 
 	/**