run method
Implementation
List<Token?> run(List<Token?> tokens) {
var stackLength = _stack.length;
for (int i = 0; i < stackLength; i++) {
PipelineFunction fn = _stack[i];
List<Token?> memo = [];
for (var j = 0; j < tokens.length; j++) {
var result = fn(tokens[j], j, tokens);
if (result == null || result.toString() == '') continue;
if (result is List<Token?>) {
memo.addAll(result);
} else {
memo.add(result);
}
}
tokens = memo;
}
return tokens;
}