function hygienize(TokenStream $ts, string $scope) : TokenStream
{
$ts->reset();
traverse(either(chain(token(T_STRING, '·unsafe'), parentheses()), either(token(T_VARIABLE)->as('target'), chain(identifier()->as('target'), token(':')), chain(token(T_GOTO), identifier()->as('target')))->onCommit(function (Ast $result) use($scope) {
(function () use($scope) {
if ((string) $this !== '$this') {
$this->value = (string) $this . '·' . $scope;
}
})->call($result->target);
}), any()))->parse($ts);
$ts->reset();
return $ts;
}
function hygienize(TokenStream $ts, array $context) : TokenStream
{
$ts->reset();
$cg = (object) ['node' => null, 'context' => $context, 'ts' => $ts];
$saveNode = function (Parser $parser) use($cg) {
return midrule(function ($ts) use($cg, $parser) {
$cg->node = $ts->index();
return $parser->parse($ts);
});
};
traverse(chain(token(T_STRING, '··unsafe'), either(parentheses(), braces())), either($saveNode(token(T_VARIABLE)), chain($saveNode(identifier()), token(':')), chain(token(T_GOTO), $saveNode(identifier())))->onCommit(function (Ast $result) use($cg) {
if (($t = $cg->node->token) && ($value = (string) $t) !== '$this') {
$cg->node->token = new Token($t->type(), "{$value}·{$cg->context['scope']}", $t->line());
}
}))->parse($ts);
$ts->reset();
return $ts;
}
