execute method

@override JinjaValue execute(Context ctx)

Executes the statement within the given ctx and returns the result as a JinjaValue.

Implementation

@override
JinjaValue execute(Context ctx) {
  final arg = argument.execute(ctx);
  if (op.value == 'not') return JinjaBoolean(!arg.asBool);
  if (op.value == '-') {
    if (arg is JinjaInteger) return JinjaInteger(-arg.value);
    if (arg is JinjaFloat) return JinjaFloat(-arg.value);
    throw Exception('Unary - expects numeric');
  }
  if (op.value == '+') {
    if (arg.isNumeric) return arg;
    throw Exception('Unary + expects numeric');
  }
  throw Exception('Unknown unary op ${op.value}');
}