Set in context

[Alekcei]

i need help please
how implement set "=" in Map context

[rbellens]

The = operator is currently not supported.

You could implement it yourself and do a PR. This means adapting the parser class, creating an AssignmentExpression class and adding an evalAssignment method in the ExpressionEvaluator.

Alternatively, you could use a set method instead of the = operator. So, if you would have an expression like x["something"] = 'hello', write it as x.set("something", 'hello') instead. This will be parsed by the default parser. You would only need to create a custom evaluator that extends the default ExpressionEvaluator and overrides the evalMemberExpression. Something like this:

class MyEvaluator extends ExpressionEvaluator {
  const MyEvaluator();

  @override
  evalMemberExpression(MemberExpression expression, Map<String, dynamic> context) {
    var object = eval(expression.object, context).toJson();
    if (object is Map&&expression.property.name=='set') {
      return (key, value) => object[key] = value;
    }
    return super.evalMemberExpression(expression, context);
  }
}